WO2023011079A1 - 一种通信方法及装置 - Google Patents

一种通信方法及装置 Download PDF

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Publication number
WO2023011079A1
WO2023011079A1 PCT/CN2022/103731 CN2022103731W WO2023011079A1 WO 2023011079 A1 WO2023011079 A1 WO 2023011079A1 CN 2022103731 W CN2022103731 W CN 2022103731W WO 2023011079 A1 WO2023011079 A1 WO 2023011079A1
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WIPO (PCT)
Prior art keywords
cell
terminal device
access
capability information
wireless capability
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PCT/CN2022/103731
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English (en)
French (fr)
Inventor
李娇娇
常俊仁
谢曦
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华为技术有限公司
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Publication of WO2023011079A1 publication Critical patent/WO2023011079A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/04—Scheduled access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/249—Reselection being triggered by specific parameters according to timing information

Definitions

  • the embodiments of the present application relate to the field of communication technologies, and in particular, to a communication method and device.
  • the terminal device can actively report wireless capability information different from the actual wireless capability information of the terminal device to the access and mobility management function (AMF) network element.
  • AMF access and mobility management function
  • the embodiment of the present application discloses a communication method and device, which are used to improve the mobility of terminal equipment.
  • the first aspect discloses a communication method, which can be applied to a terminal device, and can also be applied to a module (for example, a chip) in the terminal device.
  • a communication method which can be applied to a terminal device, and can also be applied to a module (for example, a chip) in the terminal device.
  • the following uses an application to a terminal device as an example for description.
  • This method of communication may include:
  • the terminal device may report the first wireless capability information to the network device, so as to camp on a cell according to the first wireless capability information.
  • the terminal device can re-report the second wireless capability information to the network device, so that the terminal device can re-camp in the cell according to the updated wireless capability information, which can ensure that the terminal device has a suitable cell Residential, which can improve the mobility of terminal equipment.
  • the communication method may also include:
  • the first cell satisfies the trigger condition, and the first cell may be one cell or multiple cells.
  • the terminal device does not update the reported wireless capability information at will, but only updates the reported wireless capability information when the first cell meets the trigger condition, which can avoid unnecessary updates that cause the terminal device to fail In the case of staying in a cell or disconnection, the mobility of terminal equipment can be improved.
  • the first cell is the current cell selected by the cell, or the highest-ranked cell among the candidate cells for cell reselection;
  • the trigger condition is that the state of the cell is prohibiting the access of terminal equipment with the maximum DL MIMO layer number a, and allowing the access of terminal equipment with the maximum DL MIMO layer number b, where a is the maximum DL value included in the first wireless capability information.
  • the number of MIMO layers, b is the maximum number of DL MIMO layers included in the second wireless capability information.
  • the terminal device reporting the first wireless capability information is prohibited from accessing, and the terminal device reporting the second wireless capability information is allowed to access.
  • it indicates that the terminal device cannot quickly find a suitable cell to camp on based on the first wireless capability information.
  • the terminal device can re-report the second wireless capability information in order to update the reported wireless capability information, and then it can Information re-selects a suitable cell to reside in, which can ensure that the terminal device can quickly find a suitable cell to reside in, thereby improving the mobility of the terminal device.
  • the current cell selected by the cell may be understood as a cell where the terminal device is or will be camped on.
  • the first cell is a cell satisfying a cell selection criterion or a cell satisfying a cell reselection criterion
  • the trigger condition includes: no suitable cell and/or no acceptable cell.
  • the terminal device when there is no suitable cell and/or no acceptable cell for the cell that satisfies the cell selection criterion or the cell that meets the cell reselection criterion, it indicates that the terminal device cannot currently find a suitable and/or acceptable cell based on the first wireless capability information.
  • the terminal device can re-report the second wireless capability information, so as to update the reported wireless capability information, and then reselect a suitable cell to reside in according to the updated wireless capability information, which can ensure that the terminal device has a suitable cell and/or acceptable cell camping, thereby improving the mobility of the terminal device.
  • the first cell is the first M cells that meet the cell selection criteria in the cell selection, or the cell whose cell quality is greater than or equal to the first threshold in the cell selection, or the candidate cells in the cell reselection
  • the candidate cells are sorted according to the cell reselection criteria, M is an integer greater than or equal to 1, and N is greater than or equal to 1 an integer of
  • the trigger condition includes: no suitable cell and/or no acceptable cell.
  • the terminal device when there are no suitable cells and/or no acceptable cells in the first M cells that meet the cell selection criteria in the cell selection, or there are no suitable cells and/or in the cells whose cell quality is greater than or equal to the first threshold in the cell selection, There are no acceptable cells, or there are no suitable cells and/or no acceptable cells among the top N cells among the candidate cells for cell reselection, or there are no suitable cells for cells whose cell quality is greater than or equal to the second threshold during cell reselection and/or Or when there is no acceptable cell, it indicates that the terminal device cannot currently find a suitable cell with higher cell quality and/or an acceptable cell to camp on according to the first wireless capability information, and the terminal device may re-report the second wireless capability information, so that Update the reported wireless capability information, and then reselect a suitable and/acceptable cell to reside in according to the updated wireless capability information, which can ensure that the terminal device has a suitable cell with high cell quality to reside in, thereby improving the quality of the terminal device.
  • the trigger condition further includes: there is a cell that allows a terminal device with a maximum number of DL MIMO layers of b to access, where b is the maximum number of DL MIMO layers included in the second wireless capability information.
  • the terminal device when the terminal device cannot find a suitable cell to camp on according to the first wireless capability information, but can find a suitable cell to camp on according to the second wireless capability information, the terminal device can re-report the second wireless capability information. Capability information, so as to update the reported wireless capability information, and then reselect a suitable cell to reside in according to the updated wireless capability information, which can ensure that the terminal device has a suitable cell to reside in, thereby improving the mobility of the terminal device.
  • the communication method may also include:
  • the update of the list of prohibited cells by the terminal device can be understood as the terminal device cancels the access restriction of some or all of the cells, or regards some or all of the cells as prohibited as candidate cells.
  • the terminal device after the terminal device updates the reported wireless capability information, it can update the forbidden cell list according to the updated wireless capability information, so that the terminal device can reselect the cell to camp on according to the updated wireless capability information, and speed up the cell camping. process.
  • the second aspect discloses a communication method, which can be applied to a terminal device, and can also be applied to a module (for example, a chip) in the terminal device.
  • a communication method which can be applied to a terminal device, and can also be applied to a module (for example, a chip) in the terminal device.
  • the following uses an application to a terminal device as an example for description.
  • This method of communication may include:
  • the first cell is the current cell or the neighboring cell of the first terminal device, and the cell state indicates that a terminal device with a maximum DL MIMO layer number of X is allowed or prohibited to access input, or indicate that terminal equipment with X receiving antennas is allowed or prohibited from accessing, where X is 1 or 2;
  • the current cell of the first terminal device may be understood as the cell where the terminal device is or will be camped on.
  • the current cell of the first terminal device can be understood as the cell (or serving cell) where the terminal device resides;
  • the adjacent cell of the first terminal device can be understood as the adjacent cell (or serving cell) of the cell where the terminal device resides. For example, neighboring cells broadcast by the serving cell).
  • the terminal device after receiving the cell state of the first cell from the access network device during the cell selection or cell reselection process, the terminal device can determine whether the first cell is forbidden according to the specific meaning of the cell state.
  • One terminal device access, or allow the first terminal device to access, so as to ensure that the terminal device and the network device have the same understanding of the meaning of the cell status, and avoid the inconsistency of understanding the meaning of the cell status, which leads to the selection of the wrong cell, or cannot be selected
  • the condition of the cell resides, thereby improving the mobility of the terminal equipment.
  • the cell state indication allowing or prohibiting access of a terminal device with a maximum DL MIMO layer number of X includes:
  • the cell state indicates that a terminal device with a maximum DL MIMO layer number of 1 is allowed to access, and a terminal device with a maximum DL MIMO layer number of 2 is prohibited from accessing;
  • the determining according to the state of the cell that the first cell forbids or allows the first terminal device to access includes:
  • the first cell allows the first terminal device to access, and the first terminal device has one receiving antenna or two receiving antennas.
  • the terminal equipment can access the first cell. That is, determining whether the first cell permits or prohibits the terminal device from accessing is determined according to the maximum number of DL MIMO layers reported by the terminal device, rather than according to the number of receiving antennas (or physical receiving antennas) that the terminal device has.
  • the communication method may also include:
  • the wireless capability information includes that the maximum number of DL MIMO layers is 1.
  • the cell status indication allowing or prohibiting terminal equipment with X receiving antennas to access includes:
  • the cell state indicates that terminal equipment with two receiving antennas is prohibited from accessing, and terminal equipment with one receiving antenna is allowed to access;
  • the determining according to the state of the cell that the first cell forbids or allows the first terminal device to access includes:
  • the first cell is allowed to be accessed by the first terminal device, and the first terminal device has a receiving antenna.
  • the terminal device receiving the antenna may determine that the terminal device is prohibited from accessing the first cell; if the terminal device is a terminal device with one receiving antenna, determine that the terminal device is allowed to access the first cell. That is, it is determined that the first cell allows or prohibits the terminal device from accessing based on the number of receiving antennas (or physical receiving antennas) that the terminal device has, rather than according to the maximum number of DL MIMO layers reported by the terminal device.
  • the cell state indication allowing or prohibiting access of a terminal device with a maximum DL MIMO layer number of X includes:
  • the cell state indicates that terminal equipment with a maximum number of DL MIMO layers of 1 is prohibited from accessing, and terminal equipment with a maximum number of DL MIMO layers of 2 is allowed to access;
  • the determining according to the state of the cell that the first cell forbids or allows the first terminal device to access includes:
  • the first cell allows the first terminal device to access, and the first terminal device has one receiving antenna or two receiving antennas.
  • the terminal equipment can access the first cell. That is, determining whether the first cell permits or prohibits the terminal device from accessing is determined according to the maximum number of DL MIMO layers reported by the terminal device, rather than according to the number of receiving antennas (or physical receiving antennas) that the terminal device has.
  • the communication method may also include:
  • the wireless capability information includes that the maximum number of DL MIMO layers is 2.
  • the cell status indication allowing or prohibiting terminal equipment with X receiving antennas to access includes:
  • the cell status indicates that terminal equipment with one receiving antenna is prohibited from accessing, and terminal equipment with two receiving antennas is allowed to access;
  • the determining according to the state of the cell that the first cell forbids or allows the first terminal device to access includes:
  • the first cell is allowed to be accessed by the first terminal device, where the first terminal device has two receiving antennas.
  • the terminal device receiving the antenna may determine that the terminal device is prohibited from accessing the first cell; if the terminal device is a terminal device with two receiving antennas, determine that the terminal device is allowed to access the first cell. That is, it is determined that the first cell allows or prohibits the terminal device from accessing based on the number of receiving antennas (or physical receiving antennas) that the terminal device has, rather than according to the maximum number of DL MIMO layers reported by the terminal device.
  • the communication method may also include:
  • indication information where the indication information is used to indicate that the cell state indicates that a terminal device with a maximum DL MIMO layer number of X is allowed or prohibited to access, or that the cell state indicates that a terminal device with X receiving antennas is allowed or prohibited access;
  • the determining according to the state of the cell that the first cell forbids or allows the first terminal device to access includes:
  • the specific meaning of the cell state can be indicated by the network device to the terminal device, so as to ensure that the terminal device and the network device have a consistent understanding of the meaning of the cell state, and can avoid inconsistent understanding of the meaning of the cell state leading to the selected cell error, or the situation that the cell cannot be selected to camp on, so that the mobility of the terminal equipment can be improved.
  • the third aspect discloses a communication method, which can be applied to a terminal device, and can also be applied to a module (for example, a chip) in the terminal device.
  • a communication method which can be applied to a terminal device, and can also be applied to a module (for example, a chip) in the terminal device.
  • the following uses an application to a terminal device as an example for description.
  • This method of communication may include:
  • the first wireless capability information includes a maximum number of DL MIMO layers of 1 and 2;
  • Sending first indication information where the first indication information is used to indicate that the maximum number of DL MIMO layers to be used by the terminal device is a, and a is 1 or 2.
  • the terminal device can report the wireless capability information with the maximum DL MIMO layers 1 and 2 to the network device, but the maximum DL MIMO layers to be used by the terminal device can be reported by the terminal device to the network device.
  • the first indication information is included in a connection establishment request message or a connection recovery request message.
  • the terminal device may report the maximum number of DL MIMO layers to be used by the terminal device in the connection establishment or connection recovery request message.
  • the terminal device can determine the maximum number of DL MIMO layers to report based on the received cell status and other factors, so as to ensure that the terminal device can access the network to the greatest extent.
  • the communication method may also include:
  • the second indication information is used to instruct the terminal device to preferentially use or use the maximum number of DL MIMO layers as b, where b is equal to 1 or 2.
  • the terminal device may report the maximum number of DL MIMO layers to be used to the network device, but the maximum number of DL MIMO layers used during scheduling may be determined by the network device and indicated to the terminal device. It can also be that the network device indicates to the terminal device the maximum number of DL MIMO layers that the terminal device wants to use, but the maximum number of DL MIMO layers used during scheduling can be determined by the terminal device.
  • the fourth aspect discloses a communication device, and the communication device may be a terminal device, or may be a module (for example, a chip) in the terminal device.
  • the communication device may include:
  • a sending unit configured to send the first wireless capability information to the first network device
  • the sending unit is further configured to send second wireless capability information to the second network device, where the maximum number of DL MIMO layers included in the first wireless capability information and the second wireless capability information are different.
  • the communication device may also include:
  • a determining unit configured to determine that a first cell satisfies a trigger condition, and the first cell may be one cell or multiple cells.
  • the first cell is the current cell selected by the cell, or the highest-ranked cell among the candidate cells for cell reselection;
  • the trigger condition is that the state of the cell is prohibiting the access of terminal equipment with the maximum DL MIMO layer number a, and allowing the access of terminal equipment with the maximum DL MIMO layer number b, where a is the maximum DL value included in the first wireless capability information.
  • the number of MIMO layers, b is the maximum number of DL MIMO layers included in the second wireless capability information.
  • the first cell is a cell satisfying a cell selection criterion or a cell satisfying a cell reselection criterion
  • the trigger condition includes: no suitable cell and/or no acceptable cell.
  • the first cell is the first M cells that meet the cell selection criteria in the cell selection, or the cell whose cell quality is greater than or equal to the first threshold in the cell selection, or the candidate cells in the cell reselection
  • the candidate cells are sorted according to the cell reselection criteria, M is an integer greater than or equal to 1, and N is greater than or equal to 1 an integer of
  • the trigger condition includes: no suitable cell and/or no acceptable cell.
  • the trigger condition further includes: there is a cell that allows a terminal device with a maximum number of DL MIMO layers of b to access, where b is the maximum number of DL MIMO layers included in the second wireless capability information.
  • the communication device may also include:
  • An updating unit configured to update the forbidden cell list according to the second wireless capability information.
  • a fifth aspect discloses a communication device.
  • the communication device may be a terminal device, or may be a module (for example, a chip) in the terminal device.
  • the communication device may include:
  • the receiving unit is configured to receive the cell state of the first cell from the access network device, the first cell is the current cell or the neighboring cell of the first terminal device, and the cell state indicates that the maximum number of DL MIMO layers is allowed or prohibited to be X's terminal equipment access, or indicates that terminal equipment with X receiving antennas is allowed or prohibited to access, where X is 1 or 2;
  • a determining unit configured to determine, according to the cell state, that the first cell prohibits or allows the first terminal device to access.
  • the cell state indication allowing or prohibiting access of a terminal device with a maximum DL MIMO layer number of X includes:
  • the cell state indicates that a terminal device with a maximum DL MIMO layer number of 1 is allowed to access, and a terminal device with a maximum DL MIMO layer number of 2 is prohibited from accessing;
  • the determining unit is specifically configured to determine that the first cell is allowed to be accessed by the first terminal device, and the first terminal device has one receiving antenna or two receiving antennas.
  • the communication device may also include:
  • the first sending unit is configured to send wireless capability information, where the wireless capability information includes that the maximum number of DL MIMO layers is 1.
  • the cell status indication allowing or prohibiting terminal equipment with X receiving antennas to access includes:
  • the cell state indicates that terminal equipment with two receiving antennas is prohibited from accessing, and terminal equipment with one receiving antenna is allowed to access;
  • the determining unit is specifically used for:
  • the first cell is allowed to be accessed by the first terminal device, and the first terminal device has a receiving antenna.
  • the cell state indication allowing or prohibiting access of a terminal device with a maximum DL MIMO layer number of X includes:
  • the cell state indicates that terminal equipment with a maximum number of DL MIMO layers of 1 is prohibited from accessing, and terminal equipment with a maximum number of DL MIMO layers of 2 is allowed to access;
  • the determining unit is specifically configured to determine that the first cell is allowed to be accessed by the first terminal device, and the first terminal device has one receiving antenna or two receiving antennas.
  • the communication device may also include:
  • the second sending unit is configured to send wireless capability information, where the wireless capability information includes that the maximum number of DL MIMO layers is 2.
  • the cell status indication allowing or prohibiting terminal equipment with X receiving antennas to access includes:
  • the cell status indicates that terminal equipment with one receiving antenna is prohibited from accessing, and terminal equipment with two receiving antennas is allowed to access;
  • the determining unit is specifically used for:
  • the first cell is allowed to be accessed by the first terminal device, where the first terminal device has two receiving antennas.
  • the communication device may also include:
  • the obtaining unit is used to obtain indication information, and the indication information is used to indicate that the cell state indicates that a terminal device with a maximum DL MIMO layer number of X is allowed or prohibited to access, or indicates that the cell state indicates that it is allowed or prohibited to have X roots Terminal equipment access for receiving antennas;
  • the determining unit is specifically configured to determine, according to the cell state and the indication information, that the first cell prohibits or allows the first terminal device to access.
  • a sixth aspect discloses a communication device.
  • the communication device may be a terminal device, or may be a module (for example, a chip) in the terminal device.
  • the communication device may include:
  • a sending unit configured to send first wireless capability information, where the first wireless capability information includes a maximum number of DL MIMO layers of 1 and 2;
  • the sending unit is configured to send first indication information, where the first indication information is used to indicate that the maximum number of DL MIMO layers to be used by the terminal device is a, and a is 1 or 2.
  • the first indication information is included in a connection establishment request message or a connection recovery request message.
  • the communication device may also include:
  • a receiving unit configured to receive second indication information, where the second indication information is used to instruct the terminal device to preferentially use or use the maximum number of DL MIMO layers as b, where b is equal to 1 or 2.
  • the seventh aspect discloses a communication device.
  • the communication device may include a processor configured to enable the communication device to implement the communication method described above.
  • the communication device may further include a memory, and/or a transceiver, and the transceiver is used for receiving information from other communication devices other than the communication device, and outputting information to other communication devices other than the communication device, when When the processor executes the computer program stored in the memory, the processor is made to execute the above-mentioned communication method.
  • the eighth aspect discloses a computer-readable storage medium, on which a computer program or computer instruction is stored, and when the computer program or computer instruction is run, the communication method as disclosed in the above aspects is implemented.
  • the ninth aspect discloses a chip, including a processor, configured to execute a program stored in the memory, and when the program is executed, the chip executes the above method.
  • the memory is located outside the chip.
  • the tenth aspect discloses a computer program product, the computer program product includes computer program code, and when the computer program code is executed, the above communication method is executed.
  • FIG. 1 is a schematic diagram of updating wireless capability information of a UE disclosed in an embodiment of the present application
  • Fig. 2 is a schematic diagram of establishing an RRC connection disclosed in the present application
  • FIG. 3 is a schematic diagram of an RRC connection recovery disclosed in the present application.
  • Fig. 4 is a schematic diagram of a RedCap UE capability report disclosed in the embodiment of the present application.
  • FIG. 5 is a schematic diagram of a network architecture disclosed in an embodiment of the present application.
  • FIG. 6 is a schematic diagram of a 5G architecture disclosed in an embodiment of the present application.
  • FIG. 7 is a schematic flowchart of a communication method disclosed in an embodiment of the present application.
  • FIG. 8 is a schematic flowchart of another communication method disclosed in the embodiment of the present application.
  • FIG. 9 is a schematic flowchart of another communication method disclosed in the embodiment of the present application.
  • FIG. 10 is a schematic flowchart of another communication method disclosed in the embodiment of the present application.
  • FIG. 11 is a schematic flowchart of another communication method disclosed in the embodiment of the present application.
  • Fig. 12 is a schematic flowchart of another communication method disclosed in the embodiment of the present application.
  • FIG. 13 is a schematic flowchart of another communication method disclosed in the embodiment of the present application.
  • Fig. 14 is a schematic structural diagram of a communication device disclosed in an embodiment of the present application.
  • Fig. 15 is a schematic structural diagram of another communication device disclosed in the embodiment of the present application.
  • Fig. 16 is a schematic structural diagram of another communication device disclosed in the embodiment of the present application.
  • Fig. 17 is a schematic structural diagram of another communication device disclosed in the embodiment of the present application.
  • Fig. 18 is a schematic structural diagram of another communication device disclosed in the embodiment of the present application.
  • the embodiment of the present application discloses a communication method and device, which are used to improve the mobility of terminal equipment. Each will be described in detail below.
  • Network devices (including access network devices and core network devices) need to make appropriate decisions based on capability information of user equipment (UE) when making various event judgments or executing various algorithms.
  • the capability information of the UE may include radio capability information of the UE.
  • the wireless capability information of the UE is the capability information concerned by the access network equipment, which may include the maximum bandwidth capability supported by the UE, the maximum (uplink, UP) uplink or downlink (downlink, DL) multiple input multiple output (multiple input multiple output) of the UE, MIMO) layer (layer) number, etc.
  • the UE's wireless capability information can be stored in the access and mobility management function (AMF) network element, so that the UE does not need to report frequently when performing state transitions, which can reduce the transmitted information, thereby saving air interface overhead.
  • the AMF network element can send the latest UE radio capability information to the access network device.
  • FIG. 1 is a schematic diagram of updating wireless capability information of a UE disclosed in an embodiment of the present application. As shown in FIG. 1 , the procedure for updating wireless capability information of the UE may include the following steps.
  • the UE establishes a radio resource control (RRC) connection with the access network device. If the UE is in the connected state before and the UE changes the radio capability information of the UE, the UE can release the locally established RRC connection and enter the idle state.
  • RRC radio resource control
  • the UE sends a registration request message (registration request message) to the AMF network element, and the registration request message includes a UE radio capability update indication (UE radio capability update needed).
  • registration request message a registration request message
  • UE radio capability update indication UE radio capability update needed
  • the AMF network element After the AMF network element receives the registration request message including the UE wireless capability update indication, it deletes the stored UE wireless capability information.
  • the AMF network element sends an N2 request (REQUEST) message to the access network device, and the N2 request message does not include the radio capability information of the UE.
  • the N2 request message may be an initial context setup request (INITIAL CONTEXT SETUP REQUEST) message or other messages, which are not limited here.
  • the access network device After the access network device receives the N2 request message from the AMF network element, since there is no available UE wireless capability information in the access network device, it can request the UE's wireless capability information from the UE, that is, send the UE Capability request (UE Capability Inquiry) message.
  • the UE Capability request UE Capability Inquiry
  • the UE After the UE receives the UE Capability Inquiry message from the access network device, it can report the updated UE wireless capability information to the access network device, that is, send a UE Capability Information (UE Capability Information) message to the access network device.
  • UE Capability Information UE Capability Information
  • the access network device can send the UE radio capability information to the AMF network element through the N2UE RADIO CAPABILITY INFO INDICATION message.
  • the AMF network element After the AMF network element receives the N2UE RADIO CAPABILITY INFO INDICATION message from the access network device, it can store the updated UE radio capability information.
  • the UE when the UE reports or updates the wireless capability information, it only needs to report the maximum wireless capability information, and does not need to report all the wireless capability information. For example, if the UE reports that the maximum number of DL MIMO layers supported by the UE is 4, it indicates that the UE supports the use of DL MIMO layers with a DL MIMO layer number of 4 or less, such as 2DL MIMO layers and 1DL MIMO layers.
  • the UE When the UE initially accesses the access network and the core network, or when the UE leaves the connected state and enters the unconnected state (idle state or inactive state), the UE needs to perform cell selection, and can select a suitable cell for camping or accessing. When the UE performs cell selection, one of the following two procedures may be performed.
  • the UE can scan all RF channels in the NR frequency band according to its capability information to find a suitable cell;
  • the UE On each frequency in the frequency band, the UE only needs to search for the cell with the strongest signal, unless it may search for the cell with the second strongest signal when accessing the shared spectrum channel;
  • the process requires stored frequency information from previously received measurement control information or from previously detected cell parameter information;
  • the UE can select this cell
  • initial cell selection may be initiated.
  • the cell selected by the UE through the cell selection process can meet the cell selection criterion (cell selection criterion), that is, the S criterion, and the S criterion can be expressed as follows:
  • S rxlev and S qual can be expressed as follows:
  • the Q rxlevminoffset in Table 1 is to periodically search for a higher priority public land mobile network (public land mobile network, PLMN) when normally residing in a visited public land mobile network (visited public land mobile network, VPLMN), Offset of Q rxlevmin considered in S rxlev assessment.
  • the Q qualminoffset is the offset of the Q qualmin that is considered in the S qual evaluation when periodically searching for a higher priority PLMN while normally camping on a VPLMN.
  • the UE may be in the RRC idle state or the RRC inactive state.
  • a UE in RRC idle state or RRC inactive state will measure the cell quality of the serving cell and the cell quality of the neighboring cell.
  • the cell quality may include cell RSRP, RSRP, and the like.
  • the UE will reselect a cell with higher reselection priority or better cell quality as the serving cell to camp on. This process can be called District re-election.
  • the cell reselection process can be roughly divided into the following three stages.
  • Whether to start the measurement of the adjacent cell can be judged according to the measurement start condition, and if the measurement start condition is met, the UE can start to measure the cell quality of the corresponding neighbor cell. Whether the neighbor cell meets the measurement start condition can be determined according to the reselection priority of the neighbor cell (or the priority of the frequency point where the neighbor cell is located) and the cell quality of the serving cell. It should be understood that a neighboring cell is a cell adjacent to the serving cell or a broadcasting cell.
  • the neighbor cell measurement can be started unconditionally, that is, the neighbor cell measurement can be started directly.
  • the neighbor cell reselection priority is lower than or equal to the serving cell reselection priority
  • the cell quality of the serving cell can be measured first, and then the cell quality of the serving cell can be compared with the cell quality threshold issued by the network.
  • the serving cell When the cell quality of the serving cell is greater than or equal to (or equal to) the cell quality threshold, the neighbor cell measurement may not be started, and when the cell quality of the serving cell is less than (or less than or equal to) the cell quality threshold, the neighbor cell measurement may be started.
  • the UE can start evaluating whether to perform cell reselection to the neighbor cell.
  • the reselection priorities of neighboring cells are different, and the reselection evaluation decisions may be different.
  • the reselection priority of the neighbor cell is higher than that of the serving cell, when the UE self-camps on the current serving cell for more than 1 second, and the cell quality of the neighbor cell satisfies the specified
  • cell reselection to neighbor cells with high reselection priority can be performed.
  • high reselection priority cells are reselected, if there are multiple cells meeting the reselection criteria on the same frequency reselection priority, these cells can be sorted by the cell reselection criterion (R criterion) and converted into the same frequency reselection problem.
  • R criterion cell reselection criterion
  • the R criterion is: calculate the cell quality grade R s of the serving cell, and the cell quality grade R n of each cell adjacent to the serving cell (that is, each neighboring cell);
  • the neighboring cells can be sorted, and the cell with the largest or close to the largest cell quality level can be selected; finally, among the selected cells, the cell with the largest number of beams whose beam signal quality meets the requirements can be selected as the best cell, and the cell meets the requirements
  • R s Q meas,s +Q hyst -Qoffset temp
  • R n Q meas,n +Qoffset-Qoffset temp
  • parameter Parameter meaning Q meas,s Serving cell RSRP measured by UE Q meas,n Neighborhood RSRP measured by UE, Q hyst Cell reselection hysteresis value, a positive value, used to adjust the difficulty of reselection and reduce the ping-pong effect Qoffset R criterion calculation parameters, the offset between the serving cell and the neighboring cell Qoffset temp Additional offset for cell selection and reselection, temporarily used when RRC connection establishment fails
  • cell reselection can be performed according to the R criterion.
  • the reselection priority of the neighbor cell is lower than the reselection priority of the serving cell
  • the UE stays in the serving cell for more than 1 second, and the cell quality of the serving cell is lower than a specific threshold, and If the cell quality of the low reselection priority neighbor cell meets another specific threshold within a specific time period, then the cell reselection to the low reselection priority neighbor cell is performed.
  • cell reselection to higher reselection priority frequencies shall take precedence over cell reselection to lower reselection priority frequencies, i.e. UE prioritizes reselection to high reselection Cells with priority frequencies.
  • the UE may start to try to camp on a new cell.
  • the UE needs to receive the system message from the target neighbor cell, and then judge whether the residence condition of the neighbor cell is satisfied according to the system message.
  • the foregoing judgment may include judging whether the target neighboring cell allows the UE to access or not.
  • the UE may exclude the target neighboring cell from the candidate cell for 300 seconds (or at most 300 seconds).
  • the UE may camp on the target neighboring cell.
  • the UE will enter the state of "any cell selection" or "camped on any cell”. No camping on any cell or limited service.
  • the target neighbor cell indicates that the UE allows or prohibits access through the cell barred field in the system message of the target cell. For example, when the cell barred field in the system message of the target neighboring cell indicates that the cell status is barred, the UE in the unconnected state cannot camp on or access the cell; when the cell barred field in the system message of the target neighboring cell When indicating that the state of the cell is not barred (notbarred), the UE in the non-connected state can camp on or access the cell.
  • Reduced capability UE reduced capability UE, RedCap UE
  • a master information block may include a cellbarred field for indicating a cell state.
  • the cellbarred field may indicate that the cell allows the UE to camp and access, and may also indicate that the UE is prohibited from camping or accessing.
  • the cellbarred field indicates that the cell state is barred, it indicates that the UE cannot camp on the cell, and the cell is excluded from the candidate cell for 300 seconds (or at most 300 seconds).
  • the cellbarred field indicates that the cell state is allowed (not barred), it indicates that the UE can camp on the cell. It should be understood that other camping conditions need to be met for the UE to camp.
  • the UE When the UE is in the idle state, the UE can access the cell through the RRC connection establishment procedure.
  • the UE When the UE is in the inactive state, the UE can recover to the connected state through the RRC connection recovery procedure.
  • FIG. 2 is a schematic diagram of RRC connection establishment disclosed in this application.
  • the UE may send an RRC setup request (RRC Setup Request) message to the network device.
  • the network device can send an RRC Setup (RRC Setup) message to the UE.
  • RRC Setup RRC Setup
  • the UE may send an RRC Setup Complete (RRC Setup Complete) message to the network device.
  • RRC Setup Complete RRC Setup Complete
  • FIG. 3 is a schematic diagram of RRC connection recovery disclosed in the present application.
  • the UE may send an RRC resume request (RRC Resume Request) message to the network device.
  • the network device can send an RRC Resume (RRC Resume) message to the UE.
  • RRC Resume RRC Resume
  • the UE may send an RRC Resume Complete (RRC Resume Complete) message to the network device.
  • the network device receives the RRC Resume Complete message from the UE, it indicates that the RRC connection recovery is completed.
  • network devices may include access network devices and core network devices.
  • RedCap UE refers to a UE with reduced capabilities, including reducing the maximum bandwidth supported by the UE, and the maximum number of receiving antennas of the UE. Its application scenarios include wearable devices (such as watches), industrial wireless sensors, and video surveillance equipment. . At present, it has been stipulated that the maximum number of receiving antennas supported by RedCap UE can be 1 (that is, the number of receiving antennas is 1, or 1 receiving end (receive end, Rx), or the number of receiving physical antennas is 1) or 2 (that is, the number of receiving antennas is 2 , or 2Rx, or the number of receiving physical antennas is 2).
  • RedCap In the standard discussion of RedCap, it was also agreed to add cell barring to indicate 1Rx RedCap UE and 2Rx RedCap UE respectively in system information block (SIB) 1. For example, the simplest solution is to use two bits to indicate the cell barring of the 1Rx RedCap UE and the 2Rx RedCap UE respectively. For the access restriction of 1Rx RedCap UE and 2Rx RedCap UE, there may be 4 scenarios, and these 4 scenarios can be shown in Table 3:
  • the standard discussion has stipulated that in terms of UE capability signaling, the number of Rx antennas of the RedCap UE can be implicitly indicated through the DL MIMO layer capability parameter.
  • the RedCap UE reports that its DL MIMO layer number is 1, it can implicitly indicate that its receiving antenna number is 1.
  • the RedCap UE reports that the number of DL MIMO layers is 2, it can implicitly indicate that the number of receiving antennas is 2.
  • the UE may actively report UE wireless capability information different from the actual capability of the UE to the AMF network element.
  • the number of physical receiving antennas of the UE is 4, that is, the maximum number of DL MIMO layers can be 4, but the maximum number of DL MIMO layers included in its reporting capability is 2, so that network devices (that is, access network devices and core network devices) device) schedules UEs for the 2DL MIMO layer with the maximum capacity, so as to achieve the purpose of thermal protection.
  • FIG. 4 is a schematic diagram of a RedCap UE capability report disclosed in the embodiment of the present application.
  • the RedCap UE with two physical receiving antennas (or the RedCap UE with two receiving antennas on the hardware) has the ability to report the number of DL MIMO layers (or one receiving antenna ) as an example for illustration.
  • the RedCap UE capability report may include the following steps.
  • a RedCap UE with two physical receiving antennas (2Rx RedCap UE) is determined to report the UE capability as 1Rx (ie 1DL MIMO layer) for specific purposes, such as temperature protection (in scenario 1).
  • the UE can report the UE wireless capability information through the UE wireless capability information update process or during the registration process.
  • the DL MIMO layer number is 1;
  • the AMF network element and the first access network device store the wireless capability information of the UE including 1Rx or 1DL MIMO layer;
  • the candidate cells may include serving cells and candidate neighboring cells;
  • the serving cell changes the cell state to "prohibit 1Rx RedCap UE access, allow 2Rx RedCap UE access", or the cell state of the neighboring cell is "prohibit 1Rx RedCap UE access, allow 2Rx RedCap UE access", then the UE wireless capability information, the UE is prohibited from accessing;
  • the UE cannot access the serving cell. If all the candidate cells, or the cell barred of the candidate cells that meet specific conditions, indicate that the cell status is forbidden for 1Rx RedCap UE access, the UE cannot access it.
  • the UE when the cell barred of all candidate cells indicates that the state of the cell is to prohibit 1Rx RedCap UE access, the UE will not be able to camp in any cell, so that the UE cannot receive paging from the network or access the network, affecting users experience.
  • the cell barred of a candidate cell that satisfies specific conditions indicates that the cell state is to prohibit the access of 1Rx RedCap UE, the UE cannot camp on these cells, which affects the subsequent communication of the UE quality.
  • RedCap UE when a RedCap UE with two physical receiving antennas previously reported a capability of 1Rx (1DL MIMO layer), after the UE enters the disconnected state, it can only access a cell that allows 1Rx RedCap UE access when accessing a cell. Instead, it cannot access a cell that only allows 2Rx RedCap UEs to access. In general, the mobility of RedCap UE is greatly restricted. The same is true in the connected state. The source base station can only handover the above-mentioned UE to the target cell that allows 1Rx RedCap UE to access, which limits the mobility of the RedCap UE. Therefore, how to improve the mobility of RedCap UE has become an urgent technical problem to be solved.
  • FIG. 5 is a schematic diagram of a network architecture disclosed in an embodiment of the present application.
  • the network device may include a terminal device 501 , an access network device 502 and a core network device 503 .
  • the terminal device 501 may report the wireless capability information of the terminal device to the access network device 502 and the core network device 503, and the access network device 502 and the core network device 503 may store the wireless capability information of the terminal device.
  • the above-mentioned access network equipment 502 and core network equipment 503 may be access network equipment and core network equipment in long term evolution (LTE), or may be access network equipment in the fifth generation (5G) communication system.
  • LTE long term evolution
  • 5G fifth generation
  • Network equipment and core network equipment can also be access network equipment and core network equipment in the LTE and 5G hybrid architecture system, and can also be access network equipment and core network equipment in the future communication system.
  • the number of the aforementioned access network devices may be one or multiple.
  • the number of the aforementioned core network devices may be one or multiple.
  • FIG. 6 is a schematic diagram of a 5G architecture disclosed in an embodiment of the present application.
  • the 5G architecture may include NG-RAN and the fifth generation mobile communication technology (5th generation mobile communication technology, 5G) core network (5G core, 5GC).
  • 5G fifth generation mobile communication technology
  • 5G core 5G core
  • An NG-RAN can be a next generation base station (next generation nodebase station, gNB), which can provide NR user plane and control plane protocols to terminal equipment, and connect to 5GC via NG interface; it can also be a next generation evolved base station ( next generation evolutional node base station, ng-eNB), can provide terminal equipment with evolved universal mobile telecommunications system (universal mobile telecommunications system), UMTS) terrestrial radio access (evolved-UMTS terrestrial radio access, E-UTRA) user plane and control Surface protocol, and connected to 5GC via NG interface.
  • next generation base station next generation nodebase station
  • ng-eNB next generation evolutional node base station
  • the gNB and ng-eNB can be connected through Xn interface.
  • the gNB and ng-eNB can be connected to the 5GC through the NG interface. Specifically, they can be connected to the AMF network element through the NG-C interface, and can be connected to the user plane function (UPF) network element through the NG-U interface.
  • the Xn interface is a network interface between NG-RAN nodes.
  • the NG interface is the interface between NG-RAN and 5GC.
  • the NG-C interface is the control plane interface between NG-RAN and 5GC.
  • the NG-U interface is the user plane interface between NG-RAN and 5GC.
  • Terminal device 501 which may also be referred to as UE, mobile station (mobile station, MS), mobile terminal (mobile terminal, MT), etc., is a device that provides voice and/or data connectivity to users.
  • the terminal device can be a handheld terminal, a customer premise equipment (CPE) notebook computer, a subscriber unit, a cellular phone, a smart phone, a wireless data card, a personal digital assistant (personal digital assistant (PDA) computer, tablet computer, wireless modem (modem), handheld device (handheld), laptop computer (laptop computer), session initiation protocol (SIP) phone, cordless phone Or wireless local loop (wireless local loop, WLL) station, machine type communication (machine type communication, MTC) terminal, wearable device (such as smart watch, smart bracelet, pedometer, etc.), vehicle equipment (such as car, Bicycles, electric vehicles, airplanes, ships, trains, high-speed rail, etc.), virtual reality (virtual reality, VR) equipment, augmented reality (augmented reality, AR) equipment, wireless terminals in industrial
  • the access network device 502 is a device that provides wireless access for terminal devices, and is mainly responsible for wireless resource management on the air interface side, quality of service (quality of service, QoS) flow management, data compression and encryption, and other functions.
  • Access network equipment may include base stations in various forms, for example: macro base stations, micro base stations (also called small stations), relay stations, access points, and so on.
  • the access network device may also include a wireless internet access (wireless fidelity, WiFi) access point (access point, AP).
  • the access network device may also include a worldwide interoperability for microwave access (WiMax) base station (base station, BS).
  • WiMax worldwide interoperability for microwave access
  • the core network device 503 may be a core network (core network, CN) device corresponding to different devices in different systems.
  • core network CN
  • it can correspond to a general packet radio service (general packet radio service, GPRS) serving support node (servingGPRS support node, SGSN) and/or a GPRS gateway support node (gateway GPRS support node, GGSN).
  • GPRS general packet radio service
  • it may correspond to a mobility management entity (mobility management entity, MME) and/or a serving gateway (serving gateway, S-GW).
  • MME mobility management entity
  • serving gateway serving gateway
  • it may correspond to one or more of an AMF network element, a session management function (session management function, SMF) network element, a user plane function (user plane function, UPF) network element, and the like.
  • AMF application management function
  • SMF session management function
  • UPF user plane function
  • network architecture shown in FIG. 5 is not limited to include only the terminal equipment, access network equipment, and core network equipment shown in the figure, but may also include other terminal equipment, access network equipment not shown in the figure. equipment or core network equipment, the specific application will not list them one by one here.
  • FIG. 7 is a schematic flowchart of a communication method disclosed in an embodiment of the present application. As shown in Fig. 7, the communication method may include the following steps.
  • the first terminal device sends first wireless capability information to the first network device.
  • the first network device receives the first wireless capability information from the terminal device.
  • the first terminal device in the connected state may report the first wireless capability information of the first terminal device to the first network device.
  • the first network device may store the first wireless capability information for subsequent calling.
  • the maximum number of DL MIMO layers included in the first wireless capability information is a. a is an integer greater than or equal to 1, and may be 1, 2, 3, or other values.
  • the first network device may be an access network device, may also be a core network device, and may further include an access network device and a core network device. In the solution of the present invention, the first terminal device may be a RedCap UE.
  • the first terminal device sends second wireless capability information to the second network device.
  • the second network device receives the second wireless capability information from the first terminal device.
  • the maximum number of DL MIMO layers included in the second wireless capability information is b.
  • b is an integer greater than or equal to 1, and may be 1, 2, 3, or other values.
  • a is different from b, that is, the maximum number of DL MIMO layers included in the first wireless capability information and the second wireless capability information are different.
  • the manner in which the wireless capability information includes the maximum number of DL MIMO layers can be explicit, that is, the maximum number of DL MIMO layers of the terminal device is indicated in the wireless capability information.
  • the radio capability information may also be implicit including the maximum number of DL MIMO layers. For example, if the maximum number of DL MIMO layers is not indicated in the wireless capability information, it indicates that the maximum number of DL MIMO layers of the terminal device is 1; The number of MIMO layers is 2.
  • the second network device may be an access network device, may also be a core network device, and may further include an access network device and a core network device.
  • the first network device and the second network device may be the same network device or different network devices.
  • the first terminal device After the first terminal device sends the first wireless capability information to the first network device, if it is determined that the first cell meets the trigger condition, indicating that the wireless capability information of the first terminal device needs to be updated, it may send the second wireless capability information to the second network device .
  • the first cell may be one cell, or may be multiple cells.
  • the first cell may be the current cell selected by the cell, or the cell with the highest rank among the candidate cells for cell reselection.
  • the triggering condition may be that the cell state prohibits the access of terminal equipment with the maximum number of DL MIMO layers a, and allows the access of terminal equipment with the maximum number of DL MIMO layers b.
  • the cell state may be a cell state for the terminal equipment to be a RedCap UE.
  • the first terminal device may obtain the cell state of the first cell.
  • the cell status of the first cell may be sent by the access network device to the first terminal device in a broadcast manner during a cell selection or cell reselection process.
  • the cell state of the first cell is to prohibit the access of terminal equipment with the maximum DL MIMO layer number a, and to allow the access of terminal equipment with the maximum DL MIMO layer number to b, that is, the cell state of the first cell is to prohibit the first wireless capability
  • the terminal device with the information accesses and the terminal device with the second wireless capability information is allowed to access, it may be determined that the first cell satisfies the trigger condition.
  • the maximum number of DL MIMO layers reported by the first terminal device through the first wireless capability information is a, it can be determined according to the cell state of the first cell that the first cell prohibits the first terminal device from accessing, that is, the first terminal device currently Unable to reside in the first cell. Since the first cell allows terminal devices with a maximum number of DL MIMO layers of b to access, if the first terminal device wants to camp in the first cell, the maximum number of DL MIMO layers reported by the first terminal device is required to be b. Therefore, in order to be able to camp on the first cell, the first terminal device may initiate a UE capability update process, and report to the second network device the second wireless capability information including the maximum number of DL MIMO layers b.
  • the first cell may be the current cell selected by the cell, or the cell with the highest rank among the candidate cells for cell reselection.
  • the trigger condition may be that the cell state allows access of a terminal device whose maximum number of DL MIMO layers is b.
  • the cell state may be a cell state for the terminal equipment to be a RedCap UE.
  • the first terminal device may obtain the cell state of the first cell.
  • the cell status of the first cell may be sent by the access network device to the first terminal device in a broadcast manner during a cell selection or cell reselection process.
  • the cell state of the first cell is to allow terminal equipment with a maximum DL MIMO layer b to access, that is, when the cell state of the first cell is to allow terminal equipment with the second wireless capability information to access, it can be determined that the first cell satisfies the trigger condition.
  • the maximum number of DL MIMO layers reported by the first terminal device through the first wireless capability information is a, for example, when b is greater than a, if the first terminal device wants to To camp on the first cell with a higher capability, the maximum number of DL MIMO layers reported by the first terminal device needs to be b. Therefore, in order to be able to camp on the first cell, the first terminal device may initiate a UE capability update process, and report to the second network device the second wireless capability information including the maximum number of DL MIMO layers b.
  • the first cell may be a cell satisfying a cell selection criterion, or a cell satisfying a cell reselection criterion.
  • the trigger condition may include no suitable cell and/or no acceptable cell, which can be understood as no suitable cell, no acceptable cell, or no suitable cell and no acceptable cell.
  • a suitable cell is a cell in which the terminal device can camp.
  • An acceptable cell is a cell where a terminal device can camp to obtain limited services (such as emergency services or public warning notifications, etc.).
  • the first cell is a cell that meets the cell selection criteria, or the first cell is a cell that the terminal device can scan, or the first cell is a cell that the terminal device can scan and meets the cell selection criteria district.
  • the first terminal device cannot find a suitable cell and/or an acceptable cell in the first cell, or the first terminal device is about to enter the "any cell selection" or "camped on any cell” state, it can be determined that the first cell satisfies Triggering conditions.
  • the first cell is a cell that satisfies the cell reselection criteria, or the first cell is a candidate cell for the terminal device to perform cell reselection, or the first cell is a cell for the terminal device to perform cell reselection Among the candidate cells, the cells that meet the cell reselection criteria.
  • the first terminal device cannot find a suitable cell and/or an acceptable cell in the first cell, or the first terminal device is about to enter the "any cell selection" or "camped on any cell” state, it can be determined that the first cell satisfies Triggering conditions.
  • the trigger condition may also include the presence of a cell that allows a terminal device with a maximum number of DL MIMO layers of b to access.
  • the first terminal device may determine whether there is a cell in the first cell that allows a terminal device with a maximum number of DL MIMO layers of b to access according to the cell state of the first cell. When it is determined that there is a cell in the first cell that allows a terminal device with a maximum number of DL MIMO layers of b to access, it may be determined that the first cell satisfies the trigger condition. When it is determined that there is no cell in the first cell that allows a terminal device with a maximum number of DL MIMO layers of b to access, the first terminal device may determine that the first cell does not meet the trigger condition.
  • the triggering condition may also include the presence of a cell that allows a terminal device with a maximum DL MIMO layer number of b to access and does not allow a terminal device with a maximum DL MIMO layer number of a to access.
  • the first terminal device can judge according to the cell state of the first cell whether there is a terminal device with a maximum DL MIMO layer number b allowed to access in the first cell, and a terminal device with a maximum DL MIMO layer number a is not allowed to access. into the neighborhood.
  • the first terminal device may determine the first The cell does not meet the trigger condition.
  • the first cell may be the first M cells that meet the cell selection criteria in cell selection, or a cell whose cell quality is greater than or equal to the first threshold in cell selection, or a candidate cell for cell reselection Among the cells ranked in the top N positions, the cell whose cell quality is greater than or equal to the second threshold may also be reselected for the cell.
  • Candidate cells are sorted according to cell reselection criteria. Trigger conditions may include no suitable cells and/or no acceptable cells.
  • M is an integer greater than or equal to 1
  • N is an integer greater than or equal to 1.
  • M and/or N may be configured by the network device, or may be predefined.
  • the first cell is the first M cells that meet the cell selection criteria.
  • the order of cell selection can be sorted by frequency or cell quality, or determined by the terminal device.
  • the frequency point can be the terminal device The supported frequency points or the frequency points stored in the terminal equipment.
  • the first cell may also be a cell whose cell quality is greater than or equal to a first threshold, the cell quality may be the reference signal power or reference signal quality (such as RSRP or RSRQ) of the cell, and the first threshold may be configured by the access network device (such as The access network device broadcasts the first threshold).
  • the first terminal device cannot find a suitable cell and/or an acceptable cell in the first cell, it may be determined that the first cell satisfies the trigger condition.
  • the first cell is the cell ranked in the top N positions among the candidate cells, and the candidate cells are sorted according to the cell reselection criterion.
  • the first cell may also be a cell whose cell quality is greater than or equal to a second threshold, the cell quality may be the reference signal power or reference signal quality (such as RSRP or RSRQ) of the cell, and the second threshold may be configured by the access network device (such as The access network device broadcasts the second threshold).
  • the first terminal device cannot find a suitable cell and/or an acceptable cell in the first cell, it may be determined that the first cell satisfies the trigger condition.
  • first threshold and the second threshold may be the same or different.
  • the trigger condition may also include the presence of a cell that allows a terminal device with a maximum number of DL MIMO layers of b to access.
  • the first terminal device judges according to the cell state of the first cell whether there is a cell in the first cell that allows a terminal device with a maximum number of DL MIMO layers of b to access.
  • it can be determined that the first cell satisfies the trigger condition.
  • the first terminal device may determine that the first cell does not meet the trigger condition.
  • the triggering condition may also include the presence of a cell that allows a terminal device with a maximum DL MIMO layer number b to access, and does not allow (that is, prohibit) a terminal device with a maximum DL MIMO layer number a to access.
  • the first terminal device can judge according to the cell state of the first cell whether there is a terminal device with a maximum DL MIMO layer number b allowed to access in the first cell, and a terminal device with a maximum DL MIMO layer number a is not allowed to access. into the neighborhood.
  • the first terminal device may determine the first The cell does not meet the trigger condition.
  • the first terminal device may update the barred cell list according to the second wireless capability information, or regard part or all of the cells that were previously considered barred as candidate cells, Or the first terminal device releases the access restrictions of some or all cells.
  • the first terminal device can update the candidate cell according to the second wireless capability information, so that the first terminal device can be updated. Select a cell from the candidate cells for camping.
  • FIG. 8 is a schematic flowchart of another communication method disclosed in an embodiment of the present application. As shown in Fig. 8, the communication method may include the following steps.
  • the communication method shown in FIG. 8 is a specific application of the communication method shown in FIG. 7 .
  • the first terminal device determines the reported first wireless capability information.
  • the first terminal device may first determine the reported first wireless capability information, that is, determine the reported maximum number of DL MIMO layers.
  • the maximum number of DL MIMO layers reported can be 1, 2, or other values, which are not limited here.
  • the first terminal device with two receiving antennas may determine that the maximum number of DL MIMO layers to be reported is 1 for specific purposes, such as temperature protection and cell status restrictions. For another example, the first terminal device with two receiving antennas may determine that the reported maximum number of DL MIMO layers is 2.
  • the first terminal device sends the first wireless capability information to the first access network device and the AMF network element.
  • the first access network device and the AMF network element receive the first wireless capability information from the first terminal device.
  • the first terminal device may send the first wireless capability information to the first access network device and the AMF network element.
  • the first terminal device may first send the first wireless capability information to the first access network device, and after receiving the first wireless capability information from the first terminal device, the first access network device may send the first wireless capability information to the AMF network element. capability information.
  • the first terminal device may send the first wireless capability information to the first access network device and the AMF network element during a capability update process or a registration process of the first terminal device.
  • the first access network device is the access network device to which the first terminal device is currently connected.
  • the AMF network element When the first access network device transparently transmits the first wireless capability information, after receiving the first wireless capability information from the first access network device, the AMF network element also needs to send the first wireless capability information to the first access network device. capability information.
  • the first access network device and the core network device store the first wireless capability information.
  • the first access network device and the AMF network element may store the first wireless capability information for subsequent calling or scheduling of the terminal device.
  • the first terminal device enters an idle state or an inactive state.
  • the first terminal device performs cell selection or cell reselection.
  • Candidate cells for cell reselection may include the current cell (or serving cell) and candidate neighboring cells.
  • the first terminal device determines that the first cell meets the trigger condition.
  • step 807-step 814 is executed.
  • step 806 reference may be made to the relevant description below step 702.
  • the first terminal device establishes a connection with the first access network device (or the second access network device).
  • the first terminal device When the selected cell for cell selection or cell reselection is the cell corresponding to the first access network device, that is, the current cell (or serving cell), the first terminal device establishes a connection with the first access network device.
  • the selected cell in cell selection or cell reselection is a cell corresponding to the second access network device, that is, a neighboring cell, the first terminal device establishes a connection with the second access network device.
  • the first terminal device sends a registration request message to the AMF network element.
  • the AMF network element deletes the stored first wireless capability information.
  • the AMF network element sends an N2 request message to the first access network device (or the second access network device).
  • the first access network device (or the second access network device) sends a UE capability request message to the first terminal device.
  • the first terminal device sends the UE capability information message including the second wireless capability information to the first access network device (or the second access network device).
  • the first access network device (or the second access network device) sends the N2UE wireless capability information indication message including the second wireless capability information to the AMF network element.
  • the AMF network element stores the second radio capability information.
  • step 806-step 814 may be the relevant description corresponding to FIG. 1 .
  • FIG. 9 is a schematic flowchart of another communication method disclosed in the embodiment of the present application. As shown in Fig. 9, the communication method may include the following steps.
  • the communication method shown in FIG. 9 is another specific application of the communication method shown in FIG. 7 .
  • the first terminal device determines the reported first wireless capability information.
  • step 901 For the detailed description of step 901, reference may be made to step 801.
  • the first terminal device sends the first wireless capability information to the access network device and the AMF network element.
  • the access network device and the AMF network element receive the first wireless capability information from the first terminal device.
  • step 902 may refer to step 802 .
  • the access network device and the core network device store the first wireless capability information.
  • the access network device and the AMF network element may store the first wireless capability information for subsequent calling.
  • the access network device sends a system information (system information, SI) change instruction message to the first terminal device.
  • SI system information
  • the first terminal device receives the SI change indication message from the access network device.
  • the access network device When the system information (including the SIB1 message or other system information) changes, the access network device will send an SI change indication message to indicate to the terminal device that the system information has changed. Correspondingly, after receiving the SI change instruction, the terminal device should obtain SIB1 at a specific time.
  • the first terminal device acquires the SIB1 from the access network device.
  • the first terminal device may acquire the updated SIB1 from the access network device.
  • the cell state of the corresponding cell in the updated SIB1 is to prohibit the terminal device with the first wireless capability information from accessing, and to allow the terminal device with the second wireless capability information to access.
  • the cell state of the cell corresponding to the SIB1 may be included in the SIB1, or may be included in downlink control information (DCI) for scheduling the SIB1.
  • DCI downlink control information
  • the first terminal device determines that the first cell meets the trigger condition.
  • the first terminal device After the first terminal device obtains the SIB1 from the access network device, if it is determined that the first cell satisfies the trigger condition, it may trigger updating of the wireless capability information of the first terminal device, that is, execute steps 907-914.
  • step 906 reference may be made to the relevant description below step 702.
  • the first terminal device establishes a connection with the access network device.
  • the first terminal device sends a registration request message to the AMF network element.
  • the AMF network element deletes the stored first wireless capability information
  • the AMF network element sends an N2 request message to the access network device.
  • the access network device sends a UE capability request message to the first terminal device.
  • the first terminal device sends the UE capability information message including the second wireless capability information to the access network device.
  • the access network device sends the N2UE radio capability information indication message including the second radio capability information to the AMF network element.
  • the AMF network element stores the second wireless capability information.
  • step 906-step 914 may be the relevant description corresponding to FIG. 1 .
  • FIG. 8 shows a situation where the first terminal device in the unconnected state updates wireless capability information
  • FIG. 9 shows a situation where the first terminal device in the connected state updates wireless capability information.
  • the foregoing updating of the wireless capability may be updating the wireless capability of the first terminal device from a low capability to a high capability.
  • the first wireless capability information includes that the maximum number of DL MIMO layers is 1, and the second wireless capability information includes that the maximum number of DL MIMO layers is 2.
  • the foregoing updating of the wireless capability may also be updating the wireless capability of the first terminal device from a high capability to a low capability.
  • the first wireless capability information includes that the maximum number of DL MIMO layers is 2, and the second wireless capability information includes that the maximum number of DL MIMO layers is 1.
  • FIG. 10 is a schematic flowchart of another communication method disclosed in an embodiment of the present application. As shown in Fig. 10, the communication method may include the following steps.
  • the access network device sends the cell status of the first cell to the first terminal device.
  • the first terminal device receives the cell status of the first cell from the access network device.
  • the first cell may be the current cell of the first terminal device, or may be a neighboring cell of the first terminal device.
  • the current cell of the first terminal device may be understood as the cell where the first terminal device is or will be camped on.
  • the current cell of the first terminal device can be understood as the cell (or serving cell) where the first terminal device resides; the neighboring cell of the first terminal device can be understood as the neighbor cell of the cell where the first terminal device resides. area (such as the neighbor area broadcast by the serving cell).
  • the cell status of the first cell may indicate that the terminal device with the maximum number of DL MIMO layers X is allowed or prohibited to access, and the terminal device with the maximum number of DL MIMO layers Y is allowed or prohibited to access.
  • the cell state of the first cell may indicate that terminal devices with X receiving antennas are allowed or prohibited from accessing, and terminal devices with Y receiving antennas are allowed or prohibited from accessing. X and Y are not the same.
  • the cell state of the first cell may indicate that a terminal device with a maximum DL MIMO layer number of X is allowed to access, that is, a terminal device with a reported maximum DL MIMO layer number of X is allowed to access, that is, no matter how many receiving antennas the terminal device has, As long as the maximum number of DL MIMO layers reported by the terminal device is X, the first cell allows the terminal device to access.
  • the cell state of the first cell may also indicate that terminal devices with a maximum DL MIMO layer number of X are prohibited from accessing, that is, terminal devices with a reported maximum DL MIMO layer number of X are prohibited from accessing, that is, no matter how many receiving antennas a terminal device has , as long as the maximum number of DL MIMO layers reported by the terminal device is X, the first cell prohibits the terminal device from accessing.
  • the cell state of the first cell can also indicate that terminal devices with X receiving antennas are allowed to access, that is, regardless of the maximum number of DL MIMO layers reported by the terminal device, as long as the terminal device has X receiving antennas, the first cell allows the terminal Device access.
  • the cell state of the first cell can also indicate that terminal devices with X receiving antennas are prohibited from accessing, that is, regardless of the maximum number of DL MIMO layers reported by the terminal device, as long as the terminal device has X receiving antennas, the first cell prohibits the terminal Device access.
  • X can be 1, 2, 3, 4, or other values, which are not limited here.
  • a receiving antenna can be understood as a physical receiving antenna.
  • the access network device may indicate the cell state of the first cell to the first terminal device through a cell barred (cell barred) field.
  • cell barred cell barred
  • Table 4 The value of the cell barred field can be shown in Table 4:
  • Table 4 is only an exemplary description of the value of the cell barred field, and does not constitute a limitation.
  • the cell state of the first cell indicates that terminal equipment with a maximum DL MIMO layer number of X is allowed to access. Enter, that is, scene 3. It can also prohibit the access of terminal devices with the maximum number of DL MIMO layers of 1, and allow the access of terminal devices with the maximum number of DL MIMO layers of 2, that is, scenario 4. It can also be a terminal device whose maximum number of DL MIMO layers is 1, and a terminal device whose maximum number of DL MIMO layers is 2, which is Scenario 2.
  • the cell status indication of the first cell prohibits the access of terminal equipment with the maximum number of DL MIMO layers of X, which may be the terminal equipment with the maximum number of DL MIMO layers of 1 allowed to access, and the terminal equipment with the maximum number of DL MIMO layers of 2 is prohibited from accessing. It can also prohibit the access of terminal devices with the maximum DL MIMO layer number of 1, and allow the access of terminal devices with the maximum DL MIMO layer number of 2, that is, scenario 4; it can also prohibit the access of terminal devices with the maximum DL MIMO layer number of 2.
  • the number of terminal devices is 1, and the terminal device with the maximum number of DL MIMO layers is 2 is prohibited from accessing, that is, Scenario 1.
  • the cell status indication of the first cell allows terminal equipment with X receiving antennas to access, which may be prohibiting terminal equipment with two receiving antennas from accessing, and allowing terminal equipment with one receiving antenna to access. It may also allow terminal equipment with two receiving antennas to access, and prohibit terminal equipment with one receiving antenna from accessing. It may also allow terminal equipment with two receiving antennas to access, and allow terminal equipment with one receiving antenna to access.
  • the cell status indication of the first cell prohibits access of terminal equipment with X receiving antennas, which may be prohibiting access of terminal equipment with two receiving antennas and allowing access of terminal equipment with one receiving antenna. It may also allow terminal equipment with two receiving antennas to access, and prohibit terminal equipment with one receiving antenna from accessing. It may also be prohibiting terminal equipment with two receiving antennas from accessing, and prohibiting terminal equipment with one receiving antenna from accessing.
  • X can take a value other than 1 and 2
  • the status information of the first cell can also indicate other meanings, and the specific meaning can be determined according to the value of X.
  • the cell state of the first cell sent by the access network device may be included in the SIB1, and may also be included in the DCI for scheduling the SIB1.
  • the first terminal device determines, according to the cell state of the first cell, that the first cell prohibits or allows access by the first terminal device.
  • the first terminal device may determine whether to prohibit or allow the first cell to access the first cell according to the cell state of the first cell.
  • the first terminal device may determine that the first cell allows the first terminal device to access.
  • the first terminal device may send wireless capability information to the access network device, where the wireless capability information includes that the maximum number of DL MIMO layers is 1. That is, no matter whether the first terminal device has one receiving antenna or two receiving antennas, it can be considered that the first cell allows the first terminal device to access, and the first terminal device can report that the maximum number of DL MIMO layers is 1 after accessing.
  • the access network device here and the access network device in step 1001 may be the same access network device, or may be different access network devices.
  • the first The terminal device can determine that the first cell prohibits the first terminal device from accessing, that is, no matter whether the maximum number of DL MIMO layers to be reported by the first terminal device is 1 or 2, as long as the first terminal device has two receiving antennas, it can be regarded as the first The cell prohibits the first terminal device from accessing.
  • the first terminal device can determine that the first cell allows the first terminal device to access, that is, regardless of whether the maximum number of DL MIMO layers reported by the first terminal device is 1 or 2, it can be regarded as The first cell will allow the first terminal device to access, and the first terminal device can report that the maximum number of DL MIMI layers is 1 or 2 after accessing the network.
  • the first terminal device may determine that the first cell allows the first terminal device to access.
  • the first terminal device may send wireless capability information to the access network device, where the wireless capability information includes that the maximum number of DL MIMO layers is 2. That is, no matter whether the first terminal device has one receiving antenna or two receiving antennas, it can be considered that the first cell allows the first terminal device to access, and the first terminal device can report that the maximum number of DL MIMO layers is 2 after accessing.
  • the access network device here and the access network device in step 1001 may be the same access network device, or may be different access network devices.
  • the first The terminal device can determine that the first cell allows the first terminal device to access, that is, no matter whether the maximum number of DL MIMO layers reported by the first terminal device is 1 or 2, as long as the first terminal device has two receiving antennas, it can be regarded as the first cell The first terminal device will be allowed to access.
  • the first terminal device can determine that the first cell prohibits the first terminal device from accessing, that is, regardless of whether the maximum number of DL MIMO layers reported by the first terminal device is 1 or 2, it can be regarded as The first cell will prohibit the first terminal device from accessing, and the first terminal device can report that the maximum number of DL MIMI layers is 1 or 2 after accessing the network.
  • the cell state of the first cell indicates that a terminal device with a maximum DL MIMO layer number of 1 is allowed to access, and a terminal device with a maximum DL MIMO layer number of 2 is allowed to access, regardless of whether the first terminal device has a receiving antenna There are still two receiving antennas, and the first terminal device may determine that the first cell allows the first terminal device to access.
  • the first terminal device may send wireless capability information to the access network device, where the wireless capability information includes that the maximum number of DL MIMO layers is 1 or 2. That is, no matter whether the first terminal device has one receiving antenna or two receiving antennas, it is considered that the first cell allows the first terminal device to access.
  • the access network device here and the access network device in step 1001 may be the same access network device, or may be different access network devices.
  • the first terminal device may determine that the first cell is prohibited from being accessed by the first terminal device.
  • the first terminal device may obtain indication information.
  • the indication information may be actively sent by the access network device to the first terminal device, or the first terminal device may first send an acquisition request to the access network device, and the access network device may send the acquisition request to the first terminal device after receiving the acquisition request.
  • the indication information may indicate that the cell state of the first cell indicates that a terminal device with a maximum DL MIMO layer number of X is allowed or prohibited to access, or that the cell state of the first cell indicates that a terminal device with X receiving antennas is allowed or prohibited to access. enter.
  • the first terminal device may determine, according to the cell status of the first cell and the indication information, that the first cell prohibits or allows the first terminal device to access.
  • the first terminal device may not acquire the indication information.
  • FIG. 11 is a schematic flowchart of another communication method disclosed in an embodiment of the present application. As shown in Fig. 11, the communication method may include the following steps.
  • the terminal device sends first wireless capability information.
  • the first wireless capability information may include the maximum number of DL MIMO layers being 1 and 2.
  • the maximum number of DL MIMO layers reported by a terminal device with two receiving antennas is 1 and 2.
  • the maximum number of DL MIMO layers reported by the terminal device can be 1, 2 and 3.
  • the maximum number of DL MIMO layers reported by the terminal device can be 1, 2, 3 and 4. and so on.
  • the terminal device may include the maximum number of DL MIMO layers as 1 and 2 in the first wireless capability information, or may only include the maximum number of DL MIMO layers in the first wireless capability information Including the maximum number of DL MIMO layers is 2, which implicitly indicates that the terminal device also supports a maximum number of DL MIMO layers of 1.
  • the terminal device may send the first wireless capability information to the first network device.
  • the first network device receives the first wireless capability information from the terminal device.
  • the first network device may be an access network device, may also be a core network device, and may further include an access network device and a core network device.
  • the first network device may be a network device that initially stores the wireless capability information of the terminal device.
  • the terminal device sends first indication information.
  • the terminal device may send the first indication information.
  • the first indication information may indicate that the maximum number of DL MIMO layers preferred or used by the terminal device is a. a can be 1 or 2. When the maximum number of DL MIMO layers reported by the terminal device through the first wireless capability information is a value other than 1 and 2, a can also be other values.
  • the terminal device may send the first indication information to the second network device.
  • the second network device may be an access network device or a core network device.
  • the first network device and the second network device may be the same or different.
  • the second network device may be a network device corresponding to the target cell. If the second access network device is different from the first access network device, the second access network device may acquire the first wireless capability information of the terminal device from the first access network device.
  • the terminal device may send a connection establishment request message or a connection recovery request message, and the connection establishment request message or the connection recovery request message may include the first indication information. It can be seen that the first indication information may be included in the connection establishment request message, and may also be included in the connection recovery request message.
  • the terminal device may receive second indication information from the second network device, and the second indication information may indicate that the terminal device preferentially uses or uses the maximum number of DL MIMO layers as b.
  • b can be 1, 2, or other values.
  • b may be determined by the second network device according to a policy.
  • a and b can be the same or different.
  • the second indication information may be included in the connection establishment message, may also be included in the connection restoration message, and may also be included in the connection reestablishment message.
  • the terminal device Before the terminal device sends the first indication information, it may receive third indication information from the third network device, and the third indication information may indicate that the terminal device preferentially uses or uses the maximum number of DL MIMO layers as c.
  • c can be 1, or 2, or other values.
  • c may be determined by the third network device according to a policy.
  • a and c can be the same or different.
  • the third indication message may be included in the connection release message.
  • the third network device may be an access network device or a core network device.
  • the first network device and the third network device may be the same or different.
  • the third network device may be a network device corresponding to the target cell. If the third network device is different from the first network device, the third network device may acquire the wireless capability information of the terminal device from the first network device.
  • FIG. 12 is a schematic flowchart of another communication method disclosed in an embodiment of the present application. As shown in Fig. 12, the communication method may include the following steps.
  • the communication method shown in FIG. 12 is a specific application of the communication method shown in FIG. 11 .
  • the following is described by taking the terminal device with two antennas as an example.
  • the terminal device sends the first wireless capability information including the maximum DL MIMO layers of 1 and 2 to the first access network device and the AMF network element.
  • the first access network device and the AMF network element receive from the terminal device the first wireless capability information including the maximum DL MIMO layers being 1 and 2.
  • the terminal device with two receiving antennas may report the first wireless capability information with the envelope maximum DL MIMO layers being 1 and 2 to the access network device.
  • the first wireless capability information with the envelope maximum DL MIMO layers being 1 and 2
  • the access network device For a detailed description of the reporting manner, reference may be made to step 802 .
  • the first access network device and the core network device store the first wireless capability information.
  • step 1202 may refer to step 803 .
  • the first access network device sends an RRC connection release message to the terminal device.
  • the terminal device receives the RRC connection release message from the first access network device.
  • the first access network device may send an RRC connection release message to the terminal device.
  • the RRC connection release message may include or carry third indication information, and the third indication information is used to indicate that the terminal equipment preferentially uses or uses the maximum number of DL MIMO layers as c, that is, indicates that the terminal equipment preferentially selects and allows the maximum number of DL MIMO layers to be c access area.
  • c can be 1 or 2.
  • c is determined by the first access network device according to a policy of the first access network device. Policies can include load, etc.
  • the terminal device enters an idle state or an inactive state.
  • the terminal device may release the RRC connection between the terminal device and the first access network device, and then enter an idle state or an inactive state.
  • the third indication information includes a suspend (suspend) indication
  • the terminal device enters an inactive state.
  • the third indication information does not include the suspend indication, the terminal device enters an idle state.
  • the second access network device sends SIB1 to the terminal device.
  • the terminal device receives the SIB1 from the second access network device.
  • the second access network device may send SIB1 to the terminal device, and the terminal device may receive the SIB1 sent by the second access network device.
  • SIB1 may include the cell status of the cell.
  • the terminal device sends an RRC establishment request (or RRC recovery request) message including the first indication information to the second access network device.
  • the first indication information is used to indicate that the maximum number of DL MIMO layers preferred or used by the terminal equipment is a.
  • the second access network device receives an RRC establishment request (or RRC recovery request) message including the first indication information from the terminal device.
  • the terminal device may send an RRC establishment request message including the first indication information to the second access network device when establishing an RRC connection.
  • an RRC restoration request message including the first indication information may be sent to the second access network device.
  • the terminal device may determine the first indication information according to the cell states of the cells included in the SIB1. For example, when the cell state of the cell allows a terminal device whose maximum number of DL MIMO layers is a to access, the first indication information is determined.
  • the terminal device may also determine the first indication information according to the third indication information and the cell state of the cell included in the SIB1. For example, when the cell status of the cell prohibits the terminal equipment with the maximum number of DL MIMO layers c from accessing, a and c are different. When the cell state of the cell allows the terminal equipment with the maximum number of DL MIMO layers c to access, a and c are the same.
  • the second access network device retrieves the wireless capability information of the terminal device from the AMF network element (or the first access network device).
  • the second access network device may retrieve the wireless capability information of the terminal device from the AMF network element.
  • the second access network device may retrieve the wireless capability information of the terminal device from the first access network device.
  • the second access network device sends an RRC establishment (or RRC recovery) message including the second indication information to the terminal device.
  • the second indication information indicates that the terminal equipment preferentially uses or uses the maximum number of DL MIMO layers as b.
  • the terminal device receives an RRC setup (or RRC recovery) message from the second access network device.
  • the second access network device After the second access network device retrieves the wireless capability information of the terminal device from the AMF network element, it may schedule the terminal device according to the wireless capability information. The second access network device may determine the second indication information according to the wireless capability information and/or the first indication information.
  • the second access network device After the second access network device retrieves the wireless capability information of the terminal device from the first access network device, it may schedule the terminal device according to the wireless capability information. The second access network device may determine the second indication information according to the wireless capability information and/or the first indication information.
  • the terminal device sends an RRC establishment complete (or RRC recovery complete) message to the second access network device.
  • the first indication information may also include an RRC establishment complete (or RRC recovery complete) message. That is, at this time, the terminal device does not include the first indication information in the RRC establishment request message or the RRC recovery request message, but includes it in the RRC establishment complete message or the RRC recovery complete message.
  • the RRC establishment message or the RRC recovery message may include the second indication information, or may not include the second indication information.
  • the description of the above embodiment takes the terminal device in the unconnected state as an example, and is also applicable to the process in which the terminal device is in the connected state and the connection is being reestablished. That is, the first indication information may be included in the RRC connection reestablishment request message or the RRC connection reestablishment complete message, and the second indication information may be included in the RRC connection reestablishment process.
  • first indication information, the second indication information, and the third indication information may be present at the same time, two of them, or only one of them.
  • first indication information, the second indication information, and the third indication information reference may be made to related descriptions corresponding to FIG. 11 .
  • the wireless capability of the final terminal device may be determined by the terminal device and reported to the access network device, or may be selected by the access network device according to the wireless capability information reported by the terminal device, or may be determined by the terminal device and the access network device. determined through negotiation with network equipment.
  • FIG. 13 is a schematic flowchart of another communication method disclosed in an embodiment of the present application. As shown in Fig. 13, the communication method may include the following steps.
  • the terminal device sends wireless capability information including the maximum DL MIMO layers 1 and 2 to the first access network device and the AMF network element.
  • the first access network device and the AMF network element receive the wireless capability information including the maximum DL MIMO layer number of 1 and 2 from the terminal device.
  • step 1301 For the detailed description of step 1301, reference may be made to step 1201.
  • the first access network device and the core network device store the first wireless capability information.
  • step 1302 may refer to step 803 .
  • the first access network device determines to switch to the second access network device.
  • the first access network device may determine to switch the terminal device to the second access network device according to information such as a measurement report of the terminal device.
  • the first access network device sends a handover request message to the second access network device.
  • the second access network device receives the handover request message from the first access network device.
  • the handover request includes the above wireless capability information.
  • the second access network device determines to accept the handover of the terminal device.
  • the second access network device may determine whether to accept the handover of the terminal device according to information such as its own load and wireless capability information of the terminal device.
  • the second access network device may also determine the first indication information, where the first indication information is used to instruct the terminal device to preferentially use or use the maximum number of DL MIMO layers as 1 or 2.
  • the second access network device sends a handover request response message to the first access network device.
  • the first access network device receives the handover request response message from the second access network device.
  • the handover request response may include first indication information.
  • the first access network device sends a switching command to the terminal device.
  • the terminal device receives the handover command from the first access network device.
  • the switching command may include first indication information.
  • the terminal device establishes a connection with the second access network device.
  • the functions performed by the network device in the above communication method may also be performed by a module (for example, a chip) in the network device
  • the functions performed by the terminal device may also be performed by a module (for example, a chip) in the terminal device
  • the functions performed by the access network equipment may also be performed by modules (for example, chips) in the access network equipment
  • the functions performed by the core network equipment may also be performed by modules (for example, chips) in the core network equipment .
  • FIG. 14 is a schematic structural diagram of a communication device disclosed in an embodiment of the present application.
  • the communication device may include:
  • the sending unit 1401 is further configured to send second wireless capability information to the second network device, where the maximum number of DL MIMO layers included in the first wireless capability information and the second wireless capability information are different.
  • the communication device may also include:
  • the determining unit 1402 is configured to determine that the first cell satisfies the trigger condition, and the first cell may be one cell or multiple cells.
  • the first cell is the current cell selected by the cell, or the highest-ranked cell among the candidate cells for cell reselection;
  • the trigger condition is that the state of the cell is to prohibit the access of terminal equipment with the maximum number of DL MIMO layers a, and allow the access of terminal equipment with the maximum number of DL MIMO layers b, where a is the maximum number of DL MIMO layers included in the first wireless capability information, b is the maximum number of DL MIMO layers included in the second wireless capability information.
  • the first cell is a cell satisfying a cell selection criterion or a cell satisfying a cell reselection criterion
  • Trigger conditions include: no suitable cell and/or no acceptable cell.
  • the first cell is the top M cells that meet the cell selection criteria in the cell selection, or the cell whose cell quality is greater than or equal to the first threshold in the cell selection, or the top N cells among the candidate cells for cell reselection cell, or the cell reselected by the cell whose cell quality is greater than or equal to the second threshold, the candidate cells are sorted according to the cell reselection criteria, M is an integer greater than or equal to 1, and N is an integer greater than or equal to 1;
  • Trigger conditions include: no suitable cell and/or no acceptable cell.
  • the trigger condition further includes: there is a cell that allows a terminal device with a maximum number of DL MIMO layers of b to access, where b is the maximum number of DL MIMO layers included in the second wireless capability information.
  • the communication device may also include:
  • An updating unit 1403, configured to update the forbidden cell list according to the second wireless capability information.
  • FIG. 15 is a schematic structural diagram of another communication device disclosed in an embodiment of the present application.
  • the communication device may include a receiving unit 1501 , a determining unit 1502 , a sending unit 1503 and an acquiring unit 1504 . in:
  • the receiving unit 1501 is configured to receive the cell state of the first cell from the access network device, the first cell is the current cell or neighboring cell of the first terminal device, and the cell state of the first cell indicates that the maximum number of DL MIMO layers is allowed or prohibited It is the terminal equipment access of X, or indicates that the terminal equipment with X receiving antennas is allowed or prohibited to access, X is 1 or 2;
  • the determining unit 1502 is configured to determine, according to the cell status of the first cell, that the first cell prohibits or allows the first terminal device to access.
  • the cell status indication of the first cell to allow or prohibit the access of terminal equipment with a maximum DL MIMO layer number of X includes:
  • the cell status indication of the first cell allows terminal equipment with a maximum DL MIMO layer number of 1 to access, and prohibits terminal equipment with a maximum DL MIMO layer number of 2 from accessing;
  • the determining unit 1502 is specifically configured to determine that the first cell is allowed to be accessed by the first terminal device, and the first terminal device has one receiving antenna or two receiving antennas.
  • the sending unit 1503 is configured to send wireless capability information, where the wireless capability information includes that the maximum number of DL MIMO layers is 1.
  • the cell state indication of the first cell to allow or prohibit the terminal equipment with X receiving antennas from accessing includes:
  • the cell status indication of the first cell prohibits terminal equipment with two receiving antennas from accessing, and allows terminal equipment with one receiving antenna to access;
  • the determining unit 1502 is specifically used for:
  • the first cell is allowed to be accessed by the first terminal device, and the first terminal device has one receiving antenna.
  • the cell status indication of the first cell to allow or prohibit the access of terminal equipment with a maximum DL MIMO layer number of X includes:
  • the cell status indication of the first cell prohibits access of terminal equipment with a maximum DL MIMO layer number of 1, and allows terminal equipment with a maximum DL MIMO layer number of 2 to access;
  • the determining unit 1502 is specifically configured to determine that the first cell is allowed to be accessed by the first terminal device, and the first terminal device has one receiving antenna or two receiving antennas.
  • the sending unit 1503 is configured to send wireless capability information, where the wireless capability information includes that the maximum number of DL MIMO layers is 2.
  • the cell state indication of the first cell to allow or prohibit the terminal equipment with X receiving antennas from accessing includes:
  • the cell state indication of the first cell prohibits terminal equipment with one receiving antenna from accessing, and allows terminal equipment with two receiving antennas to access;
  • the determining unit 1502 is specifically used for:
  • the first cell is allowed to be accessed by the first terminal device, and the first terminal device has two receiving antennas.
  • the communication device may also include:
  • the obtaining unit 1504 is configured to obtain indication information, and the indication information is used to indicate that the cell status of the first cell indicates that the terminal equipment with a maximum DL MIMO layer number of X is allowed or prohibited to access, or indicates that the cell status of the first cell indicates that it is allowed or prohibited Terminal equipment access with X receiving antennas;
  • the determining unit 1502 is specifically configured to determine, according to the cell status and indication information of the first cell, that the first cell prohibits or allows the first terminal device to access.
  • receiving unit 1501, determining unit 1502, sending unit 1503, and obtaining unit 1504 can be directly obtained by referring to the relevant description of the terminal device in the method embodiment shown in FIG. 10 above, and will not be repeated here.
  • FIG. 16 is a schematic structural diagram of another communication device disclosed in an embodiment of the present application.
  • the communication device may include:
  • a sending unit 1601 configured to send first wireless capability information, where the first wireless capability information includes a maximum number of DL MIMO layers of 1 and 2;
  • the sending unit 1601 is configured to send first indication information, where the first indication information is used to indicate that the maximum number of DL MIMO layers to be used by the terminal device is a, and a is 1 or 2.
  • the first indication information is included in a connection establishment request message or a connection recovery request message.
  • the communication device may also include:
  • the receiving unit 1602 is configured to receive second indication information, where the second indication information is used to instruct the terminal device to preferentially use or use the maximum number of DL MIMO layers as b, where b is equal to 1 or 2.
  • the receiving unit and the sending unit may be collectively referred to as a transceiver unit.
  • the communication device may include a processor 1701 , a memory 1702 , a transceiver 1703 and a bus 1704 .
  • the memory 1702 may exist independently, and may be connected to the processor 1701 through the bus 1704 .
  • the memory 1702 can also be integrated with the processor 1701.
  • the bus 1704 is used to realize the connection between these components.
  • the transceiver 1703 may include a transmitter 17031 , a receiver 17032 and an antenna 17033 .
  • the transceiver 1703 may include a transmitter (ie, an output interface) and a receiver (ie, an input interface).
  • a transmitter may include a transmitter and an antenna, and a receiver may include a receiver and an antenna.
  • the communication device may be a terminal device, or a module in the terminal device.
  • the processor 1701 when the computer program instructions stored in the memory 1702 are executed, the processor 1701 is used to control the sending unit 1401 to perform the operations performed in the above embodiments, and the processor 1701 is also used to perform the determination in the above embodiments
  • the operations performed by the unit 1402 and the update unit 1403, the transceiver 1703 is used to perform the operations performed by the sending unit 1401 in the above embodiment.
  • the above-mentioned communication device may also be used to execute various methods performed by the terminal device in the above-mentioned method embodiments in FIGS. 7-9 , which will not be repeated here.
  • the processor 1701 when the computer program instructions stored in the memory 1702 are executed, the processor 1701 is used to control the receiving unit 1501 and the sending unit 1503 to perform the operations performed in the above embodiments, and the processor 1701 is also used to perform The operations performed by the determining unit 1502 and the acquiring unit 1504 in the above embodiment, and the transceiver 1703 are used to perform the operations performed by the receiving unit 1501 and the sending unit 1503 in the above embodiment.
  • the above-mentioned communication device may also be used to execute various methods performed by the terminal device in the above-mentioned method embodiment in FIG. 10 , which will not be repeated here.
  • the processor 1701 when the computer program instructions stored in the memory 1702 are executed, the processor 1701 is used to control the sending unit 1601 and the receiving unit 1602 to perform the operations performed in the above-mentioned embodiment, and the transceiver 1703 is used to perform the above-mentioned implementation
  • the operations performed by the sending unit 1601 and the receiving unit 1602 are shown in the example.
  • the above-mentioned communication device may also be used to execute various methods performed by the terminal device in the above-mentioned method embodiments in FIG. 11 and FIG. 12 , which will not be repeated here.
  • FIG. 18 is a schematic structural diagram of another communication device disclosed in an embodiment of the present application.
  • the communication device may include an input interface 1801 , a logic circuit 1802 and an output interface 1803 .
  • the input interface 1801 and the output interface 1803 are connected through a logic circuit 1802 .
  • the input interface 1801 is used for receiving information from other communication devices
  • the output interface 1803 is used for outputting, scheduling or sending information to other communication devices.
  • the logic circuit 1802 is configured to perform operations other than the operations of the input interface 1801 and the output interface 1803 , for example, realizing the functions implemented by the processor 1701 in the above-mentioned embodiments.
  • the communication device may be a terminal device (or a module in the terminal device).
  • the input interface 1801, the logic circuit 1802, and the output interface 1803 can be directly obtained by referring to the relevant description of the terminal device in the above method embodiment, and details are not repeated here.
  • the embodiment of the present application also discloses a computer-readable storage medium on which instructions are stored, and when the instructions are executed, the methods in the above method embodiments are executed.
  • the embodiment of the present application also discloses a computer program product including an instruction, and when the instruction is executed, the method in the above method embodiment is executed.
  • the embodiment of the present application also discloses a communication system, which may include a network device and a terminal device.
  • a communication system which may include a network device and a terminal device.
  • FIGS. 7-13 For a specific description, reference may be made to the communication methods shown in FIGS. 7-13 .

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Abstract

本申请实施例公开一种通信方法及装置，该方法包括：终端设备向第一网络设备发送第一无线能力信息，之后向第二网络设备发送第二无线能力信息，第一无线能力信息和第二无线能力信息包括的最大下行DL多输入多输出MIMO层数不同。本申请实施例，当终端设备根据上报的无线能力信息无法找到合适的小区驻留时，可以更新上报的无线能力信息，以便终端设备可以找到合适的小区进行驻留，从而可以提高终端设备的移动性。

Description

一种通信方法及装置
本申请要求于2021年08月06日提交中国专利局、申请号为202110903361.7、申请名称为“一种通信方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及通信技术领域，尤其涉及一种通信方法及装置。
背景技术
终端设备为了达到特定目的(例如温保)，可以主动向接入和移动性管理功能(access and mobility management function，AMF)网元上报与终端设备实际无线能力信息不同的无线能力信息。当终端设备小区选择或小区重选过程中，选择的小区禁止上述上报的无线能力信息的终端设备接入时，终端设备将无法驻留在选择的小区，限制了终端设备的移动性。因此，如何提高终端设备的移动性已成为一个亟待解决的技术问题。
发明内容
本申请实施例公开了一种通信方法及装置，用于提高终端设备的移动性。
第一方面公开一种通信方法，该通信方法可以应用于终端设备，也可以应用于终端设备中的模块(例如，芯片)。下面以应用于终端设备为例进行描述。该通信方法可以包括：
向第一网络设备发送第一无线能力信息；
向第二网络设备发送第二无线能力信息，所述第一无线能力信息和所述第二无线能力信息包括的最大下行(downlink，DL)多输入多输出(multiple input multiple output，MIMO)层数不同。
本申请实施例中，终端设备可以向网络设备上报第一无线能力信息，以便可以根据第一无线能力信息驻留在一个小区。当后续无法找到合适的小区驻留时，终端设备可以重新向网络设备上报第二无线能力信息，以便终端设备可以根据更新后的无线能力信息重新驻留在小区，可以保证终端设备有合适的小区驻留，从而可以提高终端设备的移动性。
作为一种可能的实施方式，该通信方法还可以包括：
确定第一小区满足触发条件，所述第一小区可以为一个小区或多个小区。
本申请实施例中，终端设备并不是随意更新上报的无线能力信息的，而是在第一小区满足触发条件的情况下才更新上报的无线能力信息的，可以避免不必要的更新导致终端设备无法驻留在小区或连接中断的情况，从而可以提高终端设备的移动性。
作为一种可能的实施方式，所述第一小区为小区选择的当前小区，或者小区重选的候选小区中排名最高的小区；
所述触发条件为小区状态为禁止最大DL MIMO层数为a的终端设备接入，且允许最大DL MIMO层数为b的终端设备接入，a为所述第一无线能力信息包括的最大DL MIMO层数，b为所述第二无线能力信息包括的最大DL MIMO层数。
本申请实施例中，当小区选择的当前小区，或者小区重选的候选小区中排名最高的小区 禁止上报第一无线能力信息的终端设备接入，且允许上报第二无线能力信息的终端设备接入时，表明终端设备当前无法根据第一无线能力信息快速找到合适的小区进行驻留，终端设备可以重新上报第二无线能力信息，以便更新上报的无线能力信息，进而可以根据更新后的无线能力信息重新选择合适的小区驻留，可以保证终端设备可以快速找到合适的小区驻留，从而可以提高终端设备的移动性。其中，小区选择的当前小区，可以理解为终端设备正在或即将进行驻留的小区。
作为一种可能的实施方式，所述第一小区为满足小区选择准则的小区或满足小区重选准则的小区；
所述触发条件包括：没有合适小区和/或没有可接受小区。
本申请实施例中，当满足小区选择准则的小区，或者满足小区重选准则的小区没有合适小区和/或没有可接受小区时，表明终端设备当前无法根据第一无线能力信息找到合适和/可接受的小区进行驻留，终端设备可以重新上报第二无线能力信息，以便更新上报的无线能力信息，进而可以根据更新后的无线能力信息重新选择合适的小区驻留，可以保证终端设备有合适的小区和/或可接受的小区驻留，从而可以提高终端设备的移动性。
作为一种可能的实施方式，所述第一小区为小区选择中满足小区选择准则的前M个小区，或者小区选择中小区质量大于或等于第一阈值的小区，或者小区重选的候选小区中排列在前N位的小区，或者小区重选中小区质量大于或等于第二阈值的小区，所述候选小区按照小区重选准则进行排序，M为大于或等于1的整数，N为大于或等于1的整数；
所述触发条件包括：没有合适小区和/或没有可接受小区。
本申请实施例中，当小区选择中满足小区选择准则的前M个小区没有合适小区和/或没有可接受小区，或者小区选择中小区质量大于或等于第一阈值的小区没有合适小区和/或没有可接受小区，或者小区重选的候选小区中排列在前N位的小区没有合适小区和/或没有可接受小区，或者小区重选中小区质量大于或等于第二阈值的小区没有合适小区和/或没有可接受小区时，表明终端设备当前无法根据第一无线能力信息找到较高小区质量的合适的小区和/或可接受的小区进行驻留，终端设备可以重新上报第二无线能力信息，以便更新上报的无线能力信息，进而可以根据更新后的无线能力信息重新选择合适和/可接受的小区驻留，可以保证终端设备有具有较高小区质量的合适的小区驻留，从而可以提高终端设备的移动性。
作为一种可能的实施方式，所述触发条件还包括：存在允许最大DL MIMO层数为b的终端设备接入的小区，b为所述第二无线能力信息包括的最大DL MIMO层数。
本申请实施例中，当终端设备当前无法根据第一无线能力信息找到合适的小区进行驻留，但根据第二无线能力信息可以找到合适的小区进行驻留时，终端设备可以重新上报第二无线能力信息，以便更新上报的无线能力信息，进而可以根据更新后的无线能力信息重新选择合适的小区驻留，可以保证终端设备有合适的小区驻留，从而可以提高终端设备的移动性。
作为一种可能的实施方式，该通信方法还可以包括：
根据所述第二无线能力信息更新禁止小区列表。终端设备更新禁止小区列表可以理解为终端设备解除部分或全部小区的接入限制，或将部分或全部视为禁止的小区视为候选小区。
本申请实施例中，终端设备更新了上报的无线能力信息之后，可以根据更新后的无线能力信息更新禁止小区列表，以便终端设备可以根据更新的无线能力信息重新选择小区驻留，加快小区驻留过程。
第二方面公开一种通信方法，该通信方法可以应用于终端设备，也可以应用于终端设备 中的模块(例如，芯片)。下面以应用于终端设备为例进行描述。该通信方法可以包括：
接收来自接入网设备的第一小区的小区状态，所述第一小区为第一终端设备的当前小区或邻区，所述小区状态指示允许或禁止最大DL MIMO层数为X的终端设备接入，或者指示允许或禁止具有X根接收天线的终端设备接入，X为1或2；
根据所述小区状态确定所述第一小区禁止或允许所述第一终端设备接入。
对于小区选择过程，第一终端设备的当前小区，可以理解为终端设备正在或即将进行驻留的小区。对于小区重选过程，第一终端设备的当前小区，可以理解为终端设备驻留的小区(或服务小区)；第一终端设备的邻区，可以理解为终端设备驻留的小区的邻区(例如服务小区广播的邻区)。
本申请实施例中，终端设备在小区选择或小区重选过程中，接收到来自接入网设备的第一小区的小区状态之后，可以根据小区状态的具体含义，来确定第一小区是禁止第一终端设备接入，还是允许第一终端设备接入，以便可以保证终端设备和网络设备对小区状态的含义理解一致，可以避免对小区状态的含义理解不一致导致选择的小区错误，或选择不到小区驻留的情况，从而可以提高终端设备的移动性。
作为一种可能的实施方式，所述小区状态指示允许或禁止最大DL MIMO层数为X的终端设备接入包括：
所述小区状态指示允许最大DL MIMO层数为1的终端设备接入，且禁止最大DL MIMO层数为2的终端设备接入；
所述根据所述小区状态确定所述第一小区禁止或允许所述第一终端设备接入包括：
确定所述第一小区允许所述第一终端设备接入，所述第一终端设备具有一根接收天线或两根接收天线。
本申请实施例中，当第一小区的小区状态指示允许最大DL MIMO层数为1的终端设备接入，且禁止最大DL MIMO层数为2的终端设备接入时，可以理解为终端设备具有一根接收天线或两根接收天线，终端设备可以接入第一小区。即确定第一小区允许或禁止终端设备接入是根据终端设备上报的最大DL MIMO层数确定的，而不是根据终端设备具有的接收天线(或物理接收天线)的数量确定的。
作为一种可能的实施方式，该通信方法还可以包括：
发送无线能力信息，所述无线能力信息包括最大DL MIMO层数为1。
作为一种可能的实施方式，所述小区状态指示允许或禁止具有X根接收天线的终端设备接入包括：
所述小区状态指示禁止具有两根接收天线的终端设备接入，且允许具有一根接收天线的终端设备接入；
所述根据所述小区状态确定所述第一小区禁止或允许所述第一终端设备接入包括：
确定所述第一小区禁止所述第一终端设备接入，所述第一终端设备具有两根接收天线；
确定所述第一小区允许所述第一终端设备接入，所述第一终端设备具有一根接收天线。
本申请实施例中，当第一小区的小区状态指示禁止具有两根接收天线的终端设备接入，且允许具有一根接收天线的终端设备接入时，可以理解为如果终端设备为具有两根接收天线的终端设备，可以确定第一小区禁止终端设备接入；如果终端设备为具有一根接收天线的终端设备，确定第一小区允许终端设备接入。即确定第一小区允许或禁止终端设备接入是根据终端设备具有的接收天线(或物理接收天线)的数量来确定的，而不是根据终端设备上报的最大DL MIMO层数确定的。
作为一种可能的实施方式，所述小区状态指示允许或禁止最大DL MIMO层数为X的终端设备接入包括：
所述小区状态指示禁止最大DL MIMO层数为1的终端设备接入，且允许最大DL MIMO层数为2的终端设备接入；
所述根据所述小区状态确定所述第一小区禁止或允许所述第一终端设备接入包括：
确定所述第一小区允许所述第一终端设备接入，所述第一终端设备具有一根接收天线或两根接收天线。
本申请实施例中，当第一小区的小区状态指示禁止最大DL MIMO层数为1的终端设备接入，且允许最大DL MIMO层数为2的终端设备接入时，可以理解为终端设备具有一根接收天线或两根接收天线，终端设备可以接入第一小区。即确定第一小区允许或禁止终端设备接入是根据终端设备上报的最大DL MIMO层数确定的，而不是根据终端设备具有的接收天线(或物理接收天线)的数量确定的。
作为一种可能的实施方式，该通信方法还可以包括：
发送无线能力信息，所述无线能力信息包括最大DL MIMO层数为2。
作为一种可能的实施方式，所述小区状态指示允许或禁止具有X根接收天线的终端设备接入包括：
所述小区状态指示禁止具有一根接收天线的终端设备接入，且允许具有两根接收天线的终端设备接入；
所述根据所述小区状态确定所述第一小区禁止或允许所述第一终端设备接入包括：
确定所述第一小区禁止所述第一终端设备接入，所述第一终端设备具有一根接收天线；
确定所述第一小区允许所述第一终端设备接入，所述第一终端设备具有两根接收天线。
本申请实施例中，当第一小区的小区状态指示禁止具有一根接收天线的终端设备接入，且允许具有两根接收天线的终端设备接入时，可以理解为如果终端设备为具有一根接收天线的终端设备，可以确定第一小区禁止终端设备接入；如果终端设备为具有两根接收天线的终端设备，确定第一小区允许终端设备接入。即确定第一小区允许或禁止终端设备接入是根据终端设备具有的接收天线(或物理接收天线)的数量来确定的，而不是根据终端设备上报的最大DL MIMO层数确定的。
作为一种可能的实施方式，该通信方法还可以包括：
获取指示信息，所述指示信息用于指示所述小区状态指示允许或禁止最大DL MIMO层数为X的终端设备接入，或者指示所述小区状态指示允许或禁止具有X根接收天线的终端设备接入；
所述根据所述小区状态确定所述第一小区禁止或允许所述第一终端设备接入包括：
根据所述小区状态和所述指示信息确定所述第一小区禁止或允许所述第一终端设备接入。
本申请实施例中，小区状态的具体的含义可以是网络设备指示给终端设备，以便可以保证终端设备和网络设备对小区状态的含义理解一致，可以避免对小区状态的含义理解不一致导致选择的小区错误，或选择不到小区驻留的情况，从而可以提高终端设备的移动性。
第三方面公开一种通信方法，该通信方法可以应用于终端设备，也可以应用于终端设备中的模块(例如，芯片)。下面以应用于终端设备为例进行描述。该通信方法可以包括：
发送第一无线能力信息，所述第一无线能力信息包括最大DL MIMO层数为1和2；
发送第一指示信息，所述第一指示信息用于指示终端设备要使用的最大DL MIMO层数为 a，a为1或2。
本申请实施例中，终端设备可以向网络设备上报最大DL MIMO层数为1和2的无线能力信息，但终端设备要使用的最大DL MIMO层数可以由终端设备上报给网络设备。
作为一种可能的实施方式，所述第一指示信息包括在连接建立请求消息或连接恢复请求消息中。
本申请实施例中，终端设备可以在连接建立或连接恢复请求消息中上报终端设备要使用的最大DL MIMO层数。终端设备可以基于接收到的小区状态等因素确定要上报的最大DL MIMO层数，从而最大程度地保证终端设备可以接入网络。
作为一种可能的实施方式，该通信方法还可以包括：
接收第二指示信息，所述第二指示信息用于指示所述终端设备优先使用或使用最大DL MIMO层数为b，b等于1或2。
本申请实施例中，可以是终端设备向网络设备上报想要使用的最大DL MIMO层数，但调度时使用的最大DL MIMO层数可以由网络设备来确定，并指示给终端设备。也可以是网络设备向终端设备指示想要终端设备使用的最大DL MIMO层数，但调度时使用的最大DL MIMO层数可以由终端设备来确定。
第四方面公开一种通信装置，该通信装置可以为终端设备，也可以为终端设备中的模块(例如，芯片)。该通信装置可以包括：
发送单元，用于向第一网络设备发送第一无线能力信息；
所述发送单元，还用于向第二网络设备发送第二无线能力信息，所述第一无线能力信息和所述第二无线能力信息包括的最大DL MIMO层数不同。
作为一种可能的实施方式，该通信装置还可以包括：
确定单元，用于确定第一小区满足触发条件，所述第一小区可以为一个小区或多个小区。
作为一种可能的实施方式，所述第一小区为小区选择的当前小区，或者小区重选的候选小区中排名最高的小区；
所述触发条件为小区状态为禁止最大DL MIMO层数为a的终端设备接入，且允许最大DL MIMO层数为b的终端设备接入，a为所述第一无线能力信息包括的最大DL MIMO层数，b为所述第二无线能力信息包括的最大DL MIMO层数。
作为一种可能的实施方式，所述第一小区为满足小区选择准则的小区或满足小区重选准则的小区；
所述触发条件包括：没有合适小区和/或没有可接受小区。
作为一种可能的实施方式，所述第一小区为小区选择中满足小区选择准则的前M个小区，或者小区选择中小区质量大于或等于第一阈值的小区，或者小区重选的候选小区中排列在前N位的小区，或者小区重选中小区质量大于或等于第二阈值的小区，所述候选小区按照小区重选准则进行排序，M为大于或等于1的整数，N为大于或等于1的整数；
所述触发条件包括：没有合适小区和/或没有可接受小区。
作为一种可能的实施方式，所述触发条件还包括：存在允许最大DL MIMO层数为b的终端设备接入的小区，b为所述第二无线能力信息包括的最大DL MIMO层数。
作为一种可能的实施方式，该通信装置还可以包括：
更新单元，用于根据所述第二无线能力信息更新禁止小区列表。
第五方面公开一种通信装置，该通信装置可以为终端设备，也可以为终端设备中的模块(例如，芯片)。该通信装置可以包括：
接收单元，用于接收来自接入网设备的第一小区的小区状态，所述第一小区为第一终端设备的当前小区或邻区，所述小区状态指示允许或禁止最大DL MIMO层数为X的终端设备接入，或者指示允许或禁止具有X根接收天线的终端设备接入，X为1或2；
确定单元，用于根据所述小区状态确定所述第一小区禁止或允许所述第一终端设备接入。
作为一种可能的实施方式，所述小区状态指示允许或禁止最大DL MIMO层数为X的终端设备接入包括：
所述小区状态指示允许最大DL MIMO层数为1的终端设备接入，且禁止最大DL MIMO层数为2的终端设备接入；
所述确定单元，具体用于确定所述第一小区允许所述第一终端设备接入，所述第一终端设备具有一根接收天线或两根接收天线。
作为一种可能的实施方式，该通信装置还可以包括：
第一发送单元，用于发送无线能力信息，所述无线能力信息包括最大DL MIMO层数为1。
作为一种可能的实施方式，所述小区状态指示允许或禁止具有X根接收天线的终端设备接入包括：
所述小区状态指示禁止具有两根接收天线的终端设备接入，且允许具有一根接收天线的终端设备接入；
所述确定单元具体用于：
确定所述第一小区禁止所述第一终端设备接入，所述第一终端设备具有两根接收天线；
确定所述第一小区允许所述第一终端设备接入，所述第一终端设备具有一根接收天线。
作为一种可能的实施方式，所述小区状态指示允许或禁止最大DL MIMO层数为X的终端设备接入包括：
所述小区状态指示禁止最大DL MIMO层数为1的终端设备接入，且允许最大DL MIMO层数为2的终端设备接入；
所述确定单元，具体用于确定所述第一小区允许所述第一终端设备接入，所述第一终端设备具有一根接收天线或两根接收天线。
作为一种可能的实施方式，该通信装置还可以包括：
第二发送单元，用于发送无线能力信息，所述无线能力信息包括最大DL MIMO层数为2。
作为一种可能的实施方式，所述小区状态指示允许或禁止具有X根接收天线的终端设备接入包括：
所述小区状态指示禁止具有一根接收天线的终端设备接入，且允许具有两根接收天线的终端设备接入；
所述确定单元具体用于：
确定所述第一小区禁止所述第一终端设备接入，所述第一终端设备具有一根接收天线；
确定所述第一小区允许所述第一终端设备接入，所述第一终端设备具有两根接收天线。
作为一种可能的实施方式，该通信装置还可以包括：
获取单元，用于获取指示信息，所述指示信息用于指示所述小区状态指示允许或禁止最大DL MIMO层数为X的终端设备接入，或者指示所述小区状态指示允许或禁止具有X根接收天线的终端设备接入；
所述确定单元，具体用于根据所述小区状态和所述指示信息确定所述第一小区禁止或允 许所述第一终端设备接入。
第六方面公开一种通信装置，该通信装置可以为终端设备，也可以为终端设备中的模块(例如，芯片)。该通信装置可以包括：
发送单元，用于发送第一无线能力信息，所述第一无线能力信息包括最大DL MIMO层数为1和2；
所述发送单元，用于发送第一指示信息，所述第一指示信息用于指示终端设备要使用的最大DL MIMO层数为a，a为1或2。
作为一种可能的实施方式，所述第一指示信息包括在连接建立请求消息或连接恢复请求消息中。
作为一种可能的实施方式，该通信装置还可以包括：
接收单元，用于接收第二指示信息，所述第二指示信息用于指示所述终端设备优先使用或使用最大DL MIMO层数为b，b等于1或2。
第七方面公开一种通信装置。该通信装置可以包括处理器，用于使得该通信装置实现上述通信方法。可选地，该通信装置还可以包括存储器、和/或收发器，收发器用于接收来自该通信装置之外的其它通信装置的信息，以及向该通信装置之外的其它通信装置输出信息，当处理器执行存储器存储的计算机程序时，使得该处理器执行上述通信方法。
第八方面公开一种计算机可读存储介质，该计算机可读存储介质上存储有计算机程序或计算机指令，当该计算机程序或计算机指令运行时，实现如上述各方面公开的通信方法。
第九方面公开一种芯片，包括处理器，用于执行存储器中存储的程序，当程序被执行时，使得芯片执行上面的方法。
作为一种可能的实施方式，存储器位于芯片之外。
第十方面公开一种计算机程序产品，该计算机程序产品包括计算机程序代码，当该计算机程序代码被运行时，使得上述通信方法被执行。
附图说明
图1是本申请实施例公开的一种UE的无线能力信息更新的示意图；
图2是本申请公开的一种RRC连接建立的示意图；
图3是本申请公开的一种RRC连接恢复的示意图；
图4是本申请实施例公开的一种RedCap UE能力上报的示意图；
图5是本申请实施例公开的一种网络架构示意图；
图6是本申请实施例公开的一种5G架构的示意图；
图7是本申请实施例公开的一种通信方法的流程示意图；
图8是本申请实施例公开的另一种通信方法的流程示意图；
图9是本申请实施例公开的又一种通信方法的流程示意图；
图10是本申请实施例公开的又一种通信方法的流程示意图；
图11是本申请实施例公开的又一种通信方法的流程示意图；
图12是本申请实施例公开的又一种通信方法的流程示意图；
图13是本申请实施例公开的又一种通信方法的流程示意图；
图14是本申请实施例公开的一种通信装置的结构示意图；
图15是本申请实施例公开的另一种通信装置的结构示意图；
图16是本申请实施例公开的又一种通信装置的结构示意图；
图17是本申请实施例公开的又一种通信装置的结构示意图；
图18是本申请实施例公开的又一种通信装置的结构示意图。
具体实施方式
本申请实施例公开了一种通信方法及装置，用于提高终端设备的移动性。以下分别进行详细说明。
为了更好地理解本申请实施例，下面先对本申请实施例的相关技术进行描述。
一.无线能力信息更新
网络设备(包括接入网设备和核心网设备)在做各种事件判决或执行各种算法时，需要根据用户设备(user equipment，UE)的能力信息做出合适的判决。UE的能力信息可以包括UE的无线能力信息。UE的无线能力信息是接入网设备关注的能力信息，可以包括UE支持的最大带宽能力、UE的最大(uplink，UP)上行或下行(downlink，DL)多输入多输出(multiple input multiple output，MIMO)层(layer)数等。
UE的无线能力信息可以存储在接入和移动性管理功能(access and mobility management function，AMF)网元，以便UE在进行状态转化时无需频繁上报，可以减少传输的信息，从而可以节省空口开销。AMF网元可以将最新的UE的无线能力信息发送给接入网设备。
当UE的无线能力信息发生变化时，UE可以通过注册过程来实现UE的无线能力信息的更新，此时注册类型可以设置为移动性注册更新。请参阅图1，图1是本申请实施例公开的一种UE的无线能力信息更新的示意图。如图1所示，UE的无线能力信息更新流程可以包括以下步骤。
1.UE与接入网设备建立无线资源控制(radio resource control，RRC)连接。若之前UE在连接态，且UE变更UE的无线能力信息，则UE可以释放本地建立的RRC连接并进入空闲态。
2.UE向AMF网元发送注册请求消息(registration request message)，注册请求消息包括UE无线能力更新指示(UE radio capability update needed)。
3.AMF网元接收到包括UE无线能力更新指示的注册请求消息之后，删除存储的UE的无线能力信息。
4.AMF网元向接入网设备发送N2请求(REQUEST)消息，N2请求消息不包括UE的无线能力信息。其中，N2请求消息可以为初始上行文建立请求(INITIAL CONTEXT SETUP REQUEST)消息，也可以为其它消息，在此不加限定。
5.接入网设备接收到来自AMF网元的N2请求消息之后，由于接入网设备中无可用的UE的无线能力信息，因此，可以向UE请求UE的无线能力信息，即向UE发送UE能力请求(UE Capability Enquiry)消息。
6.UE接收到来自接入网设备的UE Capability Enquiry消息之后，可以向接入网设备上报更新后的UE的无线能力信息，即向接入网设备发送UE能力信息(UE Capability Information)消息。
7.接入网设备接收到来自UE Capability Information消息之后，可以通过N2UE无线能力信息指示(N2UE RADIO CAPABILITY INFO INDICATION)消息向AMF网元发送UE的无线能力信息。
8.AMF网元接收到来自接入网设备的N2UE RADIO CAPABILITY INFO INDICATION消息之后，可以存储更新后的UE的无线能力信息。
值得注意的是，UE上报或更新无线能力信息时只需要上报最大的无线能力信息，不需要上报所有的无线能力信息。例如，如果UE上报UE支持的最大DL MIMO层数为4，则表明UE支持使用DL MIMO层数为4以及4以下的DL MIMO层数，如2DL MIMO层数和1DL MIMO层数等。
二.小区选择/重选
小区选择
当UE初始接入接入网和核心网，或UE离开连接态进入非连接态(空闲态或非激活态)时，UE需要进行小区选择，可以选择一个合适的小区进行驻留或接入。UE进行小区选择时可以执行以下两个过程中的一个过程。
第一.初始小区选择(没有先验信息，不知道哪些射频(radio frequency，RF)信道是新无线(new radio，NR)频率)
1.UE可以根据其能力信息扫描NR频带中的所有RF信道以找到合适的小区；
2.在频带中每个频率上，UE仅需要搜索信号最强的小区，除非在共享频谱信道接入时可能会搜索信号次强的小区；
3.找到合适的小区后，可以选择这个小区。
第二.利用存储的信息选择小区
1.该过程需要存储的频率信息，这些频率信息来自先前接收的测量控制信息或来自先前检测到的小区参数信息；
2.一旦UE找到合适的小区，UE就可以选择这个小区；
3.如果没有找到合适的小区，则可以启动初始小区选择。
UE通过小区选择过程选择的小区可以满足小区选择标准(cell selection criterion)，即S准则，S准则可以表示如下：
S rxlev＞0且S qual＞0
其中，S rxlev和S qual可以表示如下：
S rxlev＝Q rxlevmeas-(Q rxlevmin+Q rxlevminoffset)-P compensation-Qoffset temp
S qual＝Q qualmeas-(Q qualmin+Q qualminoffset)-Qoffset temp
以上各个参数含义可以如表1所示：
参数 参数含义
S rxlev 小区选择参考信号接收功率(reference signal received power，RSRP)
S qual 小区选择参考信号接收质量(reference signal received quality，RSRQ)
Q rxlevmeas 测量的小区RSRP
Q rxlevmin 小区中需要的最小RSRP
Q rxlevminoffset Q rxlevmin的偏移值
P compensation 功率补偿值
Qoffset temp 临时应用于小区的偏移值
Q qualmeas 测量的小区RSRQ
Q qualmin 小区中需要的最小RSRQ
Q qualminoffset Q qualmin的偏移值
表1 S准则参数含义
应理解，表1中的Q rxlevminoffset是正常驻留在访问公共陆地移动网(visited public land mobile network，VPLMN)时周期性搜索更高优先级的公共陆地移动网(public land mobile network，PLMN)，在S rxlev评估中考虑的Q rxlevmin的偏移。Q qualminoffset是正常驻留在VPLMN时周期性搜索更高优先级的PLMN，因此，在S qual评估中考虑的Q qualmin的偏移。
小区重选
当UE成功驻留到一个小区后，如果UE不进行任何数据业务，则UE可能会处于RRC空闲态或RRC非激活态。处于RRC空闲态或RRC非激活态的UE会测量服务小区的小区质量和邻区的小区质量。小区质量可以包括小区RSRP、RSRP等。例如，当服务小区的小区质量较差，而邻区的小区质量较好时，UE会重新选择重选优先级较高或小区质量更好的小区作为服务小区进行驻留，这个过程可以称为小区重选。小区重选过程可以大致分为以下三个阶段。
第一.启动邻区测量
可以根据测量启动条件判断是否启动邻区测量，若满足测量启动条件，则UE可以开始测量相应的邻区的小区质量。可以根据邻区的重选优先级(或邻区所在频点优先级)和服务小区的小区质量来确定邻区是否满足测量启动条件。应理解，邻区为服务小区相邻的小区或广播的小区。
当邻区重选优先级高于服务小区重选优先级时，可以无条件启动邻区测量，即直接启动邻区测量。当邻区重选优先级低于或等于服务小区重选优先级时，可以先测量服务小区的小区质量，之后可以将服务小区的小区质量与网络下发的小区质量阈值进行比较，当服务小区的小区质量大于或等于(或等于)小区质量阈值时，可以不启动邻区测量，当服务小区的小区质量小于(或小于或等于)小区质量阈值时，可以启动邻区测量。
第二.重选评估判决
邻区测量完成之后，UE可以开始评估是否执行到邻区的小区重选。邻区的重选优先级不同，重选评估判决可以不同。
对于高重选优先级邻区，即邻区的重选优先级大于服务小区的重选优先级，当UE自驻留在当前服务小区超过1秒，且邻区的小区质量在超出特定时长内满足特定阈值时，可以执行到高重选优先级邻区的小区重选。高重选优先级小区重选时，同一频点重选优先级上如果有多个小区满足重选标准，可以对这些小区进行小区重选准则(R准则)排序，转换为同频重选问题，选择一个排名最高的小区。
R准则为：计算服务小区的小区质量等级R s，以及与服务小区相邻的每个小区(即每个邻区)的小区质量等级R n；之后可以根据小区质量等级对服务小区和服务小区的邻区进行排序，可以选择小区质量等级最大或接近最大的小区；最后在选择的这些小区中，可以选择波束信号质量满足要求的波束个数最多的小区作为最好小区，并称该小区满足小区重选原则。其中，R s和R n可以表示如下：
R s＝Q meas,s+Q hyst-Qoffset temp
R n＝Q meas,n+Qoffset-Qoffset temp
其中，以上各个参数含义可以如表2所示：
参数 参数含义
Q meas,s UE测量的服务小区RSRP
Q meas,n UE测量的邻区RSRP，
Q hyst 小区重选迟滞值，正值，用于调整重选难易程度，减少乒乓效应
Qoffset R准则计算参数，服务小区与邻区之间的偏移量
Qoffset temp 小区选择和重选的附加偏移，当RRC连接建立失败时临时使用
表2 R准则参数含义
对于等重选优先级的邻区，即邻区的重选优先级等于服务小区的重选优先级，小区重选可以依据R准则进行。
对于低重选优先级的邻区，即邻区的重选优先级小于服务小区的重选优先级，如果UE驻留在服务小区超过1秒，且服务小区的小区质量低于特定阈值，且低重选优先级邻区的小区质量在超出特定时长内满足另一特定阈值，则执行到低重选优先级邻区的小区重选。
如果具有不同重选优先级的多个小区满足小区重选标准，则对较高重选优先级频率的小区重选应优先于较低重选优先级频率的小区重选，即UE优先重选到高重选优先级频率的小区。
第三.小区重选执行
在完成邻区测量并确定存在符合小区重选条件的邻区后，UE可以开始尝试驻留到新的小区。UE需要接收来自目标邻区的***消息，之后可以根据***消息判断是否满足邻区的驻留条件。上述判断可以包括判断目标邻区是否允许UE接入等。当判断出UE不满足目标邻区的驻留条件(包括目标邻区禁止UE接入)时，UE可以将目标邻区排除在候选小区之外300秒(或最多300秒)。当判断出UE满足目标邻区的驻留条件(包括目标邻区允许UE接入)时，UE可以驻留到目标邻区。当UE找不到合适的小区或可接受的小区驻留时，UE会进入“任何小区选择(any cell selection)”或“在任何小区驻留(camped on any cell)”的状态，此时UE没有驻留在任何小区上或业务受限。
目标邻区指示UE允许或禁止接入可以通过目标小区的***消息中的小区禁止(cell barred)字段指示。例如，当目标邻区的***消息中的cell barred字段指示小区状态为禁止(barred)时，非连接态的UE不能驻留或接入该小区；当目标邻区的***消息中的cell barred字段指示小区状态为非禁止(notbarred)时，非连接态的UE可以驻留或接入该小区。
三.能力降低UE(reduced capability UE，RedCap UE)
NR中，主信息块(master information block，MIB)可以包括cellbarred字段用于指示小区状态。例如，cellbarred字段可以指示小区允许UE驻留与接入，也可以指示禁止UE驻留或接入。当cellbarred字段指示小区状态为barred时，表明UE不能驻留在该小区，且将该小区排除在候选小区外300秒(或最多300秒)。当cellbarred字段指示小区状态为允许(not barred)时，表明UE可以驻留在该小区，应理解，UE驻留还需满足其他的驻留条件。当UE处于空闲态时，UE可以通过RRC连接建立过程接入小区。当UE处于非激活态时，UE可以通过RRC连接恢复过程恢复到连接态。
请参阅图2，图2是本申请公开的一种RRC连接建立的示意图。如图2所示，UE可以向网络设备发送RRC建立请求(RRC Setup Request)消息。网络设备接收到来自UE的RRC Setup Request消息之后，可以向UE发送RRC建立(RRC Setup)消息。UE接收到来自网络设备的RRC Setup消息之后，可以向网络设备发送RRC建立完成(RRC Setup Complete)消息。网络设备接收到来自UE的RRC Setup Complete消息之后，表明RRC连接建立完成。
请参阅图3，图3是本申请公开的一种RRC连接恢复的示意图。如图3所示，UE可以向网络设备发送RRC恢复请求(RRC Resume Request)消息。网络设备接收到来自UE的RRC Resume Request消息之后，可以向UE发送RRC恢复(RRC Resume)消息。UE接收到来自网络设备的RRC Resume消息之后，可以向网络设备发送RRC恢复完成(RRC Resume Complete)消息。网络设备接收到来自UE的RRC Resume Complete消息之后，表明RRC连接恢复完成。
应理解，此处的网络设备可以包括接入网设备和核心网设备。
对于RedCap UE，指的是能力降低的UE，包括降低UE支持的最大带宽，以及UE的最大接收天线数等能力，其应用场景包括可穿戴设备(例如手表)、工业无线传感器和视频监控设备等。目前，已经规定RedCap UE支持的最大接收天线数可以是1(即接收天线数为1，或1接收端(receive end，Rx)，或接收物理天线数为1)或者2(即接收天线为2，或2Rx，或接收物理天线数为2)。
在RedCap的标准讨论中还同意要在***消息块(system information block，SIB)1中增加分别指示1Rx的RedCap UE和2Rx的RedCap UE的小区禁止(cell barring)。例如，最简单的方案为使用两个比特分别指示1Rx的RedCap UE和2Rx的RedCap UE的cell barring。对于1Rx的RedCap UE和2Rx的RedCap UE的接入限制可能会出现4种场景，这4种场景可以如表3所示：
场景 1RxRedCap UE 2RxRedCap UE
场景1 not barred not barred
场景2 barred barred
场景3 barred not barred
场景4 not barred barred
表3 1RxRedCap UE和2RxRedCap UE的小区禁止组合
另外，标准讨论已经规定：在UE能力信令方面，可以通过DL MIMO层能力参数隐式地指示RedCap UE的Rx天线数。当RedCap UE上报其DL MIMO层数为1时，可以隐式地指示其接收天线数为1。当RedCap UE上报其DL MIMO层数为2时，可以隐式地指示其接收天线数为2。
在现有实现中，UE为了达到特定目的(例如温保)，可以主动向AMF网元上报与UE实际能力不同的UE无线能力信息。例如，UE的物理接收天线数为4，即其最大DL MIMO layer数可以为4，但其上报能力时包含的最大DL MIMO层数为2，从而使网络设备(即接入网设备和核心网设备)以最大能力为2DL MIMO层调度UE，从而达到温保的目的。请参阅图4，图4是本申请实施例公开的一种RedCap UE能力上报的示意图。其中，图4中结合RedCap UE的特性，以具有两根物理接收天线的RedCap UE(或硬件上有两根接收天线的RedCap UE)由于特定目的上报能力为DL MIMO层数(或1根接收天线)为例进行说明。如图4所示，RedCap UE能力上报可以包括以下步骤。
1.具有两根物理接收天线的RedCap UE(2Rx RedCap UE)出于特定目的，例如温保，(在场景1)确定上报UE能力为1Rx(即1DL MIMO层)。
2.UE可以通过UE的无线能力信息更新过程或在注册过程中上报UE无线能力信息DL  MIMO层数为1；
3.AMF网元和第一接入网设备存储UE的无线能力信息包括1Rx或1DL MIMO层；
4.后续UE进入非连接态(空闲态或非激活态)，UE进行小区选择或小区重选时，候选小区可以包括服务小区以及候选邻区；
5.服务小区变更小区状态为“禁止1Rx RedCap UE接入，允许2Rx RedCap UE接入”，或邻区的小区状态为“禁止1Rx RedCap UE接入，允许2Rx RedCap UE接入”，则按照UE的无线能力信息，UE被禁止接入；
6.UE无法接入服务小区。若所有候选小区，或满足特定条件的候选小区的cell barred指示小区状态均为禁止1Rx RedCap UE接入，则UE均不能接入。
上述过程中，例如，当所有候选小区的cell barred均指示小区状态为禁止1Rx RedCap UE接入时，UE将无法驻留在任何小区，从而UE无法接收网络的寻呼或接入网络，影响用户体验。再例如，当满足特定条件的候选小区(例如较高小区质量的候选小区)的cell barred指示小区状态为禁止1Rx RedCap UE的接入时，UE无法在这些小区上驻留，影响UE后续的通信质量。再例如，当具有两根物理接收天线的RedCap UE之前上报能力为1Rx(1DL MIMO layer)时，UE进入非连接态后，在接入小区时只能接入允许1Rx RedCap UE接入的小区，而不能接入到仅允许2Rx RedCap UE接入的小区。总的来说，RedCap UE的移动性受到很大的限制。连接态下也类似，源基站仅能将上述UE切换至允许1Rx RedCap UE接入的目标小区，限制了RedCap UE的移动性。因此，如何提高RedCap UE的移动性已成为一个亟待解决的技术问题。
为了更好地理解本申请实施例公开的一种通信方法及装置，下面先对本申请实施例使用的网络架构进行描述。请参阅图5，图5是本申请实施例公开的一种网络架构示意图。如图5所示，该网络设备可以包括终端设备501、接入网设备502和核心网设备503。终端设备501可以向接入网设备502和核心网设备503上报终端设备的无线能力信息，接入网设备502和核心网设备503可以存储终端设备的无线能力信息。
其中，上述接入网设备502和核心网设备503可以为长期演进(long term evolution，LTE)中的接入网设备和核心网设备，也可以为第五代(5G)通信***中的接入网设备和核心网设备，还可以是LTE与5G混合架构***中的接入网设备和核心网设备，还可以为未来通信***中的接入网设备和核心网设备。
上述接入网设备的数量可以为1个，也可以为多个。上述核心网设备的数量可以为1个，也可以为多个。
请参阅图6，图6是本申请实施例公开的一种5G架构的示意图。如图6所示，5G架构可以包括NG-RAN和第五代移动通信技术(5th generation mobile communication technology，5G)核心网(5G core，5GC)。一个NG-RAN可以为一个下一代基站(next generation nodebase station，gNB)，可以向终端设备提供NR用户面和控制面协议，且经由NG接口连接到5GC；也可以为一个下一代演进型基站(next generation evolutionalnodebase station，ng-eNB)，可以向终端设备提供演进的通用移动通信***(universal mobile telecommunications system)，UMTS)陆地无线接入(evolved-UMTS terrestrial radio access，E-UTRA)用户面和控制面协议，且经由NG接口连接到5GC。
gNB和ng-eNB可以通过Xn接口相连。gNB和ng-eNB可以通过NG接口与5GC相连，具体地，可以通过NG-C接口与AMF网元相连，可以通过NG-U接口与用户面功能(user plane function，UPF)网元相连。Xn接口为NG-RAN节点之间的网络接口。NG接口为NG-RAN和5GC 之间的接口。NG-C接口为NG-RAN和5GC之间的控制面接口。NG-U接口为NG-RAN和5GC之间的用户面接口。
终端设备501，又可以称之为UE、移动台(mobile station，MS)、移动终端(mobile terminal，MT)等，是一种向用户提供语音和/或数据连通性的设备。终端设备可以为手持终端、客户终端设备(customer premise equipment，CPE)笔记本电脑、用户单元(subscriber unit)、蜂窝电话(cellular phone)、智能电话(smart phone)、无线数据卡、个人数字助理(personal digital assistant，PDA)电脑、平板型电脑、无线调制解调器(modem)、手持设备(handheld)、膝上型电脑(laptop computer)、会话启动协议(session initiation protocol，SIP)电话、无绳电话(cordless phone)或者无线本地环路(wireless local loop，WLL)台、机器类型通信(machine type communication，MTC)终端，可穿戴设备(如智能手表、智能手环、计步器等)，车载设备(如汽车、自行车、电动车、飞机、船舶、火车、高铁等)、虚拟现实(virtual reality，VR)设备、增强现实(augmented reality，AR)设备、工业控制(industrial control)中的无线终端、智能家居设备(如冰箱、电视、空调、电表等)、智能机器人、车间设备、无人驾驶(self driving)中的无线终端、远程手术(remote medical surgery)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端，或智慧家庭(smart home)中的无线终端、飞行设备(如智能机器人、热气球、无人机、飞机等)或其他可以接入网络的设备。
接入网设备502为终端设备提供无线接入的设备，主要负责空口侧的无线资源管理、服务质量(quality of service，QoS)流管理、数据压缩和加密等功能。接入网设备可以包括各种形式的基站，例如：宏基站，微基站(也称为小站)，中继站，接入点等。接入网设备还可以包括无线上网(wireless fidelity，WiFi)接入节点(access point，AP)。接入网设备还可以包括全球微波互联接入(worldwide interoperability for microwave access，WiMax)基站(base station，BS)。
核心网设备503可以为核心网络(core network，CN)设备在不同的***对应不同的设备。在3G中可以对应通用分组无线服务技术(general packet radio service，GPRS)的服务支持节点(servingGPRSsupport node，SGSN)和/或GPRS的网关支持节点(gateway GPRS support node，GGSN)。在4G中可以对应移动管理实体(mobility management entity，MME)和/或服务网关(serving gateway，S-GW)。在5G中可以对应AMF网元、会话管理功能(session management function，SMF)网元、者用户面功能(user plane function，UPF)网元等中的一个或多个。
需要说明的是，图5所示的网络架构中不限于仅包括图中所示的终端设备、接入网设备和核心网设备，还可以包括其它未在图中表示的终端设备、接入网设备或核心网设备，具体本申请在此处不再一一列举。
基于上述网络架构，请参阅图7，图7是本申请实施例公开的一种通信方法的流程示意图。如图7所示，该通信方法可以包括以下步骤。
701.第一终端设备向第一网络设备发送第一无线能力信息。
相应地，第一网络设备接收来自终端设备的第一无线能力信息。
处于连接态的第一终端设备可以向第一网络设备上报第一终端设备的第一无线能力信息。第一网络设备接收到来自第一终端设备的第一无线能力信息之后，可以存储第一无线能力信息，以便后续调用。第一无线能力信息包括的最大DL MIMO层数为a。a为大于或等于1的整数，可以为1，也可以为2，还可以为3，还可以为其他值。第一网络设备可以为接入网设备， 也可以为核心网设备，还可以包括接入网设备和核心网设备。在本发明方案中，第一终端设备可以为RedCap UE。
702.第一终端设备向第二网络设备发送第二无线能力信息。
相应地，第二网络设备接收来自第一终端设备的第二无线能力信息。
第一终端设备向第一网络设备发送第一无线能力信息之后，当需要更新第一终端设备的无线能力信息时，可以向第二网络设备上报第二无线能力信息。第二无线能力信息包括的最大DL MIMO层数为b。b为大于或等于1的整数，可以为1，也可以为2，还可以为3，还可以为其他值。a与b不同，即第一无线能力信息和第二无线能力信息包括的最大DL MIMO层数不同。例如，a可以1，b可以为2。再例如，a可以为2，b可以为1。再例如，a可以1，b可以为3。再例如，a可以1，b可以为4。终端设备更新无线能力信息的过程可以参考现有技术，或通过其他方式，本方案不做限制。
无线能力信息包含最大DL MIMO层数的方式可以是显式的，即在无线能力信息中指示终端设备的最大DL MIMO层数。无线能力信息包含最大DL MIMO层数也可以是隐式的。例如，若无线能力信息中没有指示最大DL MIMO层数，则表明终端设备的最大DL MIMO层数为1，若无线能力信息中指示了最大DL MIMO层数为2，则表明终端设备的最大DL MIMO层数为2。
第二网络设备可以为接入网设备，也可以为核心网设备，还可以包括接入网设备和核心网设备。第一网络设备与第二网络设备可以为同一个网络设备，也可以为不同的网络设备。
第一终端设备向第一网络设备发送第一无线能力信息之后，如果确定第一小区满足触发条件，表明需要更新第一终端设备的无线能力信息，可以向第二网络设备发送第二无线能力信息。第一小区可以为一个小区，也可以为多个小区。
一种情况下，第一小区可以为小区选择的当前小区，也可以为小区重选的候选小区中排名最高的小区。触发条件可以为小区状态为禁止最大DL MIMO层数为a的终端设备接入，且允许最大DL MIMO层数为b的终端设备接入。小区状态可以为针对终端设备为RedCap UE的小区状态。
第一终端设备可以获取第一小区的小区状态。第一小区的小区状态可以是在小区选择或小区重选过程中接入网设备通过广播方式发送给第一终端设备的。当第一小区的小区状态为禁止最大DL MIMO层数为a的终端设备接入，且允许最大DL MIMO层数为b的终端设备接入，即第一小区的小区状态为禁止第一无线能力信息的终端设备接入，且允许第二无线能力信息的终端设备接入时，可以确定第一小区满足触发条件。
由于第一终端设备通过第一无线能力信息上报的最大DL MIMO层数为a，因此，可以根据第一小区的小区状态确定第一小区禁止第一终端设备接入，也即第一终端设备当前无法驻留到第一小区。由于第一小区允许最大DL MIMO层数为b的终端设备接入，如果第一终端设备想要驻留到第一小区，需要第一终端设备上报的最大DL MIMO层数为b。因此，第一终端设备为了能够驻留到第一小区，可以发起UE能力更新过程，向第二网络设备上报包括最大DL MIMO层数为b的第二无线能力信息。
一种情况下，第一小区可以为小区选择的当前小区，也可以为小区重选的候选小区中排名最高的小区。触发条件可以为小区状态为允许最大DL MIMO层数为b的终端设备接入。小区状态可以为针对终端设备为RedCap UE的小区状态。
第一终端设备可以获取第一小区的小区状态。第一小区的小区状态可以是在小区选择或小区重选过程中接入网设备通过广播方式发送给第一终端设备的。当第一小区的小区状态为允许最大DL MIMO层数为b的终端设备接入，即第一小区的小区状态为允许第二无线能力信 息的终端设备接入时，可以确定第一小区满足触发条件。
由于第一小区允许最大DL MIMO层数为b的终端设备接入，第一终端设备通过第一无线能力信息上报的最大DL MIMO层数为a，例如b大于a时，如果第一终端设备想要使用较高的能力驻留到第一小区，需要第一终端设备上报的最大DL MIMO层数为b。因此，第一终端设备为了能够驻留到第一小区，可以发起UE能力更新过程，向第二网络设备上报包括最大DL MIMO层数为b的第二无线能力信息。
另一种情况下，第一小区可以为满足小区选择准则的小区，也可以为满足小区重选准则的小区。触发条件可以包括没有合适小区和/或没有可接受小区，可以理解为没有合适小区，也可以理解为没有可接受小区，还可以理解为没有合适小区和没有可接受小区。
合适小区为终端设备可以驻留的小区。可接受小区为终端设备可以驻留从而获取有限的业务(如紧急服务或公共预警通知等)的小区。
第一终端设备在小区选择过程中，第一小区为满足小区选择准则的小区，或者第一小区为终端设备能够扫描到的小区，或者第一小区为终端设备能够扫描到的满足小区选择准则的小区。当第一终端设备无法在第一小区中发现合适小区和/或可接受小区时，或第一终端设备即将进入“any cell selection”或“camped on any cell”状态时，可以确定第一小区满足触发条件。
第一终端设备在小区重选过程中，第一小区为满足小区重选准则的小区，或第一小区为终端设备进行小区重选的候选小区，或第一小区为终端设备进行小区重选的候选小区中满足小区重选准则的小区。当第一终端设备无法在第一小区中发现合适小区和/或可接受小区时，或第一终端设备即将进入“any cell selection”或“camped on any cell”状态时，可以确定第一小区满足触发条件。
触发条件还可以包括存在允许最大DL MIMO层数为b的终端设备接入的小区。此时，第一终端设备可以根据第一小区的小区状态判断第一小区中是否存在允许最大DL MIMO层数为b的终端设备接入的小区。当判断出第一小区中存在允许最大DL MIMO层数为b的终端设备接入的小区时，可以确定第一小区满足触发条件。当判断出第一小区中不存在允许最大DL MIMO层数为b的终端设备接入的小区时，第一终端设备可以确定第一小区不满足触发条件。
触发条件还可以包括存在允许最大DL MIMO层数为b的终端设备接入，且不允许最大DL MIMO层数为a的终端设备接入的小区。此时，第一终端设备可以根据第一小区的小区状态判断第一小区中是否存在允许最大DL MIMO层数为b的终端设备接入，且不允许最大DL MIMO层数为a的终端设备接入的小区。当判断出第一小区中存在允许最大DL MIMO层数为b的终端设备接入，且不允许最大DL MIMO层数为a的终端设备接入的小区时，可以确定第一小区满足触发条件。当判断出第一小区中不存在允许最大DL MIMO层数为b的终端设备接入，且不允许最大DL MIMO层数为a的终端设备接入的小区时，第一终端设备可以确定第一小区不满足触发条件。
又一种情况下，第一小区可以为小区选择中满足小区选择准则的前M个小区，也可以为小区选择中小区质量大于或等于第一阈值的小区，还可以为小区重选的候选小区中排列在前N位的小区，还可以为小区重选中小区质量大于或等于第二阈值的小区。候选小区按照小区重选准则进行排序。触发条件可以包括没有合适小区和/或没有可接受小区。M为大于或等于1的整数，N为大于或等于1的整数。M和/或N可以是网络设备配置的，也可以是预定义的。
第一终端设备在小区选择过程中，第一小区为满足小区选择准则的前M个小区，小区选择的顺序可以是按照频点或小区质量排序，或终端设备实现确定，频点可以是终端设备支持 的频点或终端设备存储的频点。第一小区还可以为小区质量大于或等于第一阈值的小区，小区质量可以为小区的参考信号功率或参考信号质量(例如RSRP或RSRQ)，第一阈值可以为接入网设备配置的(例如接入网设备广播第一阈值)。当第一终端设备无法在第一小区中发现合适小区和/或可接受小区时，可以确定第一小区满足触发条件。
第一终端设备在小区重选过程中，第一小区为候选小区中排列在前N位的小区，候选小区按照小区重选准则进行排序。第一小区还可以为小区质量大于或等于第二阈值的小区，小区质量可以为小区的参考信号功率或参考信号质量(例如RSRP或RSRQ)，第二阈值可以为接入网设备配置的(例如接入网设备广播第二阈值)。当第一终端设备无法在第一小区中发现合适小区和/或可接受小区时，可以确定第一小区满足触发条件。
其中，第一阈值与第二阈值可以相同，也可以不同。
触发条件还可以包括存在允许最大DL MIMO层数为b的终端设备接入的小区。此时，第一终端设备根据第一小区的小区状态判断第一小区中是否存在小区允许最大DL MIMO层数为b的终端设备接入的小区。当判断出第一小区中存在小区允许最大DL MIMO层数为b的终端设备接入的小区，可以确定第一小区满足触发条件。当判断出第一小区中不存在小区允许最大DL MIMO层数为b的终端设备接入的小区，第一终端设备可以确定第一小区不满足触发条件。
触发条件还可以包括存在允许最大DL MIMO层数为b的终端设备接入，且不允许(即禁止)最大DL MIMO层数为a的终端设备接入的小区。此时，第一终端设备可以根据第一小区的小区状态判断第一小区中是否存在允许最大DL MIMO层数为b的终端设备接入，且不允许最大DL MIMO层数为a的终端设备接入的小区。当判断出第一小区中存在允许最大DL MIMO层数为b的终端设备接入，且不允许最大DL MIMO层数为a的终端设备接入的小区时，可以确定第一小区满足触发条件。当判断出第一小区中不存在允许最大DL MIMO层数为b的终端设备接入，且不允许最大DL MIMO层数为a的终端设备接入的小区时，第一终端设备可以确定第一小区不满足触发条件。
由于第一终端设备上报的最大DL MIMO层数更新为b之后，原先处于禁止小区列表或原先视为禁止的有些小区可能不需要排除在候选小区之外300秒(s)。因此，为了避免可能将满足驻留条件的小区排除在外300s的情况，第一终端设备可以根据第二无线能力信息更新禁止小区列表，或将部分或全部原先视为禁止的小区视为候选小区，或第一终端设备解除部分或全部小区的接入限制。
由于第一终端设备上报的最大DL MIMO层数更新为b之后，原先处于候选小区的有些小区可能由允许第一终端设备接入可能变为禁止第一终端设备接入，而原先禁止第一终端设备接入的小区可能变为允许第一终端设备接入，因此，为了提高候选小区的准确性，第一终端设备可以根据第二无线能力信息更新候选小区，以便第一终端设备可以在更新后的候选小区中选取小区进行驻留。
基于上述网络架构，请参阅图8，图8是本申请实施例公开的另一种通信方法的流程示意图。如图8所示，该通信方法可以包括以下步骤。
其中，图8所示的通信方法为图7所示的通信方法的一种具体的应用。
801.第一终端设备确定上报的第一无线能力信息。
第一终端设备可以先确定上报的第一无线能力信息，即确定上报的最大DL MIMO层数。上报的最大DL MIMO层数可以为1，也可以为2，还可以为其它值，在此不加限定。
例如，有两根接收天线的第一终端设备出于特定目的，如温保、小区状态的限制等，可以确定上报最大DL MIMO层数为1。再例如，有两根接收天线的第一终端设备可以确定上报的最大DL MIMO层数为2。
802.第一终端设备向第一接入网设备和AMF网元发送第一无线能力信息。
相应地，第一接入网设备和AMF网元接收来自第一终端设备的第一无线能力信息。
第一终端设备确定出上报的第一无线能力信息之后，可以向第一接入网设备和AMF网元发送第一无线能力信息。第一终端设备可以先向第一接入网设备发送第一无线能力信息，第一接入网设备接收到来自第一终端设备的第一无线能力信息之后，可以向AMF网元发送第一无线能力信息。第一终端设备可以在第一终端设备能力更新过程或注册过程中向第一接入网设备和AMF网元发送第一无线能力信息。第一接入网设备为第一终端设备当前连接的接入网设备。
当第一接入网设备对第一无线能力信息透传时，AMF网元接收到来自第一接入网设备的第一无线能力信息之后，还需要向第一接入网设备发送第一无线能力信息。
803.第一接入网设备和核心网设备存储第一无线能力信息。
第一接入网设备和AMF网元接收到来自第一终端设备的第一无线能力信息之后，可以存储第一无线能力信息，以便后续调用，或用于调度终端设备。
804.第一终端设备进入空闲态或非激活态。
805.第一终端设备进行小区选择或小区重选。
第一终端设备从连接态进入空闲态(idle)或非激活态(inactive)，或进行初始接入时，要进行小区选择过程；在小区选择过程选择驻留在一个小区之后，需要进行小区重选过程。小区重选的候选小区可以包括当前小区(或服务小区)以及候选邻区。
806.第一终端设备确定第一小区满足触发条件。
第一终端设备进行小区选择或小区重选时，如果确定第一小区满足触发条件，可以触发第一终端设备的无线能力信息的更新，例如执行步骤807-步骤814。
其中，步骤806的详细描述可以参考步骤702下面的相关描述。
807.第一终端设备与第一接入网设备(或第二接入网设备)建立连接。
当小区选择或小区重选中选取的小区为第一接入网设备对应的小区，即当前小区(或服务小区)时，第一终端设备与第一接入网设备建立连接。当小区选择或小区重选中选取的小区为第二接入网设备对应的小区，即邻区时，第一终端设备与第二接入网设备建立连接。
808.第一终端设备向AMF网元发送注册请求消息。
809.AMF网元删除存储的第一无线能力信息。
810.AMF网元向第一接入网设备(或第二接入网设备)发送N2请求消息。
811.第一接入网设备(或第二接入网设备)向第一终端设备发送UE能力请求消息。
812.第一终端设备向第一接入网设备(或第二接入网设备)发送包括第二无线能力信息的UE能力信息消息。
813.第一接入网设备(或第二接入网设备)向AMF网元发送包括第二无线能力信息的N2UE无线能力信息指示消息。
814.AMF网元存储第二无线能力信息。
其中，步骤806-步骤814的详细描述可以图1对应的相关描述。
基于上述网络架构，请参阅图9，图9是本申请实施例公开的又一种通信方法的流程示意 图。如图9所示，该通信方法可以包括以下步骤。
其中，图9所示的通信方法为图7所示的通信方法的另一种具体的应用。
901.第一终端设备确定上报的第一无线能力信息。
其中，步骤901的详细描述可以参考步骤801。
902.第一终端设备向接入网设备和AMF网元发送第一无线能力信息。
相应地，接入网设备和AMF网元接收来自第一终端设备的第一无线能力信息。
其中，步骤902的详细描述可以参考步骤802。
903.接入网设备和核心网设备存储第一无线能力信息。
接入网设备和AMF网元接收到来自第一终端设备的第一无线能力信息之后，可以存储第一无线能力信息，以便后续调用。
904.接入网设备向第一终端设备发送***信息(system information，SI)变更指示消息。
相应地，第一终端设备接收来自接入网设备的SI变更指示消息。
当***消息(包括SIB1消息或其他***消息)发生变更时，接入网设备会发送SI变更指示消息，向终端设备指示***消息发生变更。相应地，终端设备在接收到SI变更指示之后，应在特定时间获取SIB1。
905.第一终端设备从接入网设备获取SIB1。
第一终端设备接收到来自接入网设备的SI变更指示消息之后，可以从接入网设备获取更新后的SIB1。更新后的SIB1中对应的小区的小区状态为禁止第一无线能力信息的终端设备的接入，允许第二无线能力信息的终端设备的接入。SIB1中对应的小区的小区状态可以包括在SIB1中，也可以包括在调度SIB1的下行控制信息(downlink control information，DCI)中。
906.第一终端设备确定第一小区满足触发条件。
第一终端设备从接入网设备获取到SIB1之后，如果确定第一小区满足触发条件，可以触发第一终端设备的无线能力信息的更新，即执行步骤907-步骤914。
其中，步骤906的详细描述可以参考步骤702下面的相关描述。
907.第一终端设备与接入网设备建立连接。
908.第一终端设备向AMF网元发送注册请求消息。
909.AMF网元删除存储的第一无线能力信息
910.AMF网元向接入网设备发送N2请求消息。
911.接入网设备向第一终端设备发送UE能力请求消息。
912.第一终端设备向接入网设备发送包括第二无线能力信息的UE能力信息消息。
913.接入网设备向AMF网元发送包括第二无线能力信息的N2UE无线能力信息指示消息。
914.AMF网元存储第二无线能力信息。
其中，步骤906-步骤914的详细描述可以图1对应的相关描述。
应理解，图8为非连接态下的第一终端设备进行无线能力信息更新的情况，图9为连接态下的第一终端设备进行无线能力信息更新的情况。
应理解，上述无线能力更新可以是将第一终端设备的无线能力由低能力更新为高能力。例如，第一无线能力信息包括最大DL MIMO层数为1，第二无线能力信息包括最大DL MIMO层数为2。上述无线能力更新也可以是将第一终端设备的无线能力由高能力更新为低能力。例如，第一无线能力信息包括最大DL MIMO层数为2，第二无线能力信息包括最大DL MIMO层数为1。
基于上述网络架构，请参阅图10，图10是本申请实施例公开的又一种通信方法的流程示意图。如图10所示，该通信方法可以包括以下步骤。
1001.接入网设备向第一终端设备发送第一小区的小区状态。
相应地，第一终端设备接收来自接入网设备的第一小区的小区状态。
第一小区可以为第一终端设备的当前小区，也可以为第一终端设备的邻区。对于小区选择过程，第一终端设备的当前小区可以理解为第一终端设备正在或即将进行驻留的小区。对于小区重选过程，第一终端设备的当前小区可以理解为第一终端设备驻留的小区(或服务小区)；第一终端设备的邻区可以理解为第一终端设备驻留的小区的邻区(例如服务小区广播的邻区)。
第一小区的小区状态可以指示允许或禁止最大DL MIMO层数为X的终端设备接入，且允许或禁止最大DL MIMO层数为Y的终端设备接入。第一小区的小区状态可以指示允许或禁止具有X根接收天线的终端设备接入，且允许或禁止具有Y根接收天线的终端设备接入。X和Y不相同。第一小区的小区状态可以指示允许最大DL MIMO层数为X的终端设备接入，即允许上报的最大DL MIMO层数为X的终端设备接入，也即不论终端设备具有多少根接收天线，只要终端设备上报的最大DL MIMO层数为X，第一小区就允许终端设备接入。第一小区的小区状态也可以指示禁止最大DL MIMO层数为X的终端设备接入，即禁止上报的最大DL MIMO层数为X的终端设备接入，也即不论终端设备具有多少根接收天线，只要终端设备上报的最大DL MIMO层数为X，第一小区就禁止终端设备接入。第一小区的小区状态还可以指示允许具有X根接收天线的终端设备接入，即不论终端设备上报的最大DL MIMO层数为多少，只要终端设备具有X根接收天线，第一小区就允许终端设备接入。第一小区的小区状态还可以指示禁止具有X根接收天线的终端设备接入，即不论终端设备上报的最大DL MIMO层数为多少，只要终端设备具有X根接收天线，第一小区就禁止终端设备接入。X可以为1，也可以为2，还可以为3，还可以为4，还可以为其它值，在此不加限定。接收天线可以理解为物理接收天线。
接入网设备可以通过小区禁止(cell barred)字段向第一终端设备指示第一小区的小区状态。cell barred字段的取值可以如表4所示：
场景 cell barred字段 1RxRedCap UE 2RxRedCap UE
场景1 00 not barred not barred
场景2 01 barred barred
场景3 10 barred not barred
场景4 11 not barred barred
表4
应理解，表4只是对cell barred字段的取值的示例性说明，并不对其构成限定。
第一小区的小区状态指示允许最大DL MIMO层数为X的终端设备接入，可以为允许最大DL MIMO层数为1的终端设备接入，且禁止最大DL MIMO层数为2的终端设备接入，即场景3。也可以为禁止最大DL MIMO层数为1的终端设备接入，且允许最大DL MIMO层数为2的终端设备接入，即场景4。还可以为允许最大DL MIMO层数为1的终端设备接入，且允许最大DL MIMO层数为2的终端设备接入，即场景2。
第一小区的小区状态指示禁止最大DL MIMO层数为X的终端设备接入，可以为允许最大DL MIMO层数为1的终端设备接入，且禁止最大DL MIMO层数为2的终端设备接入，即场景3；也可以为禁止最大DL MIMO层数为1的终端设备接入，且允许最大DL MIMO层数为2的终端设备接入，即场景4；还可以为禁止最大DL MIMO层数为1的终端设备接入，且禁止最大DL  MIMO层数为2的终端设备接入，即场景1。
第一小区的小区状态指示允许具有X根接收天线的终端设备接入，可以为禁止具有两根接收天线的终端设备接入，且允许具有一根接收天线的终端设备接入。也可以为允许具有两根接收天线的终端设备接入，且禁止具有一根接收天线的终端设备接入。还可以为允许具有两根接收天线的终端设备接入，且允许具有一根接收天线的终端设备接入。
第一小区的小区状态指示禁止具有X根接收天线的终端设备接入，可以为禁止具有两根接收天线的终端设备接入，且允许具有一根接收天线的终端设备接入。也可以为允许具有两根接收天线的终端设备接入，且禁止具有一根接收天线的终端设备接入。还可以为禁止具有两根接收天线的终端设备接入，且禁止具有一根接收天线的终端设备接入。
应理解，当X可以取1和2之外的值时，第一小区的状态信息还可以指示其它意思，具体指示什么意思，可以根据X的取值确定。
接入网设备发送的第一小区的小区状态可以包含在SIB1中，也可以包含在调度SIB1的DCI中。
1002.第一终端设备根据第一小区的小区状态确定第一小区禁止或允许第一终端设备接入。
第一终端设备接收到来自接入网设备的第一小区的小区状态之后，可以根据第一小区的小区状态确定第一小区禁止还是允许第一终端设备接入。
在第一小区的小区状态指示允许最大DL MIMO层数为1的终端设备接入，且禁止最大DL MIMO层数为2的终端设备接入的情况下，如果第一终端设备具有一根接收天线或两根接收天线，第一终端设备可以确定第一小区允许第一终端设备接入。此外，第一终端设备可以向接入网设备发送无线能力信息，无线能力信息包括最大DL MIMO层数为1。即不论第一终端设备具有一根接收天线，还是两根接收天线，可以视为第一小区允许第一终端设备接入，第一终端设备接入后可以上报最大DL MIMO层数为1。应理解，此处的接入网设备与步骤1001中的接入网设备可以为同一接入网设备，也可以为不同的接入网设备。
在第一小区的小区状态指示允许具有一根接收天线的终端设备接入，且禁止具有两根接收天线的终端设备接入的情况下，当第一终端设备具有两根接收天线时，第一终端设备可以确定第一小区禁止第一终端设备接入，即不论第一终端设备要上报的最大DL MIMO层数为1还是2，只要第一终端设备具有两根接收天线，可以视为第一小区禁止第一终端设备接入。当第一终端设备具有一根接收天线时，第一终端设备可以确定第一小区允许第一终端设备接入，即不论第一终端设备上报的最大DL MIMO层数为1还是2，可以视为第一小区将允许第一终端设备接入，第一终端设备接入网络后可以上报最大DL MIMI层数为1或2。
在第一小区的小区状态指示禁止最大DL MIMO层数为1的终端设备接入，且允许最大DL MIMO层数为2的终端设备接入的情况下，如果第一终端设备具有一根接收天线或两根接收天线，第一终端设备可以确定第一小区允许第一终端设备接入。此外，第一终端设备可以向接入网设备发送无线能力信息，无线能力信息包括最大DL MIMO层数为2。即不论第一终端设备具有一根接收天线，还是两根接收天线，可以视为第一小区允许第一终端设备接入，第一终端设备接入后可以上报最大DL MIMO层数为2。应理解，此处的接入网设备与步骤1001中的接入网设备可以为同一个接入网设备，也可以为不同的接入网设备。
在第一小区的小区状态指示禁止具有一根接收天线的终端设备接入，且允许具有两根接收天线的终端设备接入的情况下，当第一终端设备具有两根接收天线时，第一终端设备可以确定第一小区允许第一终端设备接入，即不论第一终端设备上报的最大DL MIMO层数为1还 是2，只要第一终端设备具有两根接收天线，可以视为第一小区将允许第一终端设备接入。当第一终端设备具有一根接收天线时，第一终端设备可以确定第一小区禁止第一终端设备接入，即不论第一终端设备上报的最大DL MIMO层数为1还是2，可以视为第一小区将禁止第一终端设备接入，第一终端设备接入网络后可以上报最大DL MIMI层数为1或2。
在第一小区的小区状态指示允许最大DL MIMO层数为1的终端设备接入，且允许最大DL MIMO层数为2的终端设备接入的情况下，不论第一终端设备具有一根接收天线还是两根接收天线，第一终端设备可以确定第一小区允许第一终端设备接入。此外，第一终端设备可以向接入网设备发送无线能力信息，无线能力信息包括最大DL MIMO层数为1或2。即不论第一终端设备具有一根接收天线，还是两根接收天线，均视为第一小区允许第一终端设备接入。应理解，此处的接入网设备与步骤1001中的接入网设备可以为同一个接入网设备，也可以为不同的接入网设备。
在第一小区的小区状态指示禁止最大DL MIMO层数为1的终端设备接入，且禁止最大DL MIMO层数为2的终端设备接入的情况下，不论第一终端设备具有一根接收天线还是两根接收天线时，第一终端设备可以确定第一小区禁止第一终端设备接入。
通过上述可知，针对场景3和场景4，小区状态有两种理解，为了明确到底是两种理解中的哪一种理解，第一终端设备可以获取指示信息。指示信息可以是接入网设备主动发送给第一终端设备的，也可以是第一终端设备先向接入网设备发送获取请求，接入网设备接收到获取请求之后发送给第一终端设备。该指示信息可以指示第一小区的小区状态指示允许或禁止最大DL MIMO层数为X的终端设备接入，也可以指示第一小区的小区状态指示允许或禁止具有X根接收天线的终端设备接入。第一终端设备可以根据第一小区的小区状态和该指示信息确定第一小区禁止或允许第一终端设备接入。
在标准协议规定了场景3和场景4是上述两种理解中的哪一种理解的情况下，第一终端设备可以不获取指示信息。
基于上述网络架构，请参阅图11，图11是本申请实施例公开的又一种通信方法的流程示意图。如图11所示，该通信方法可以包括以下步骤。
1101.终端设备发送第一无线能力信息。
第一无线能力信息可以包括最大DL MIMO层数为1和2。具有两根接收天线的终端设备上报的最大DL MIMO层数为1和2。当终端设备具有三根接收天线时，终端设备上报的最大DL MIMO层数可以为1、2和3。当终端设备具有四根接收天线时，终端设备上报的最大DL MIMO层数可以为1、2、3和4。以此类推。
以第一无线能力信息包括最大DL MIMO层数为1和2为例，终端设备可以在第一无线能力信息中包括最大DL MIMO层数为1和2，也可以仅在第一无线能力信息中包括最大DL MIMO层数为2，即隐式的指示终端设备也支持最大DL MIMO层数为1。
终端设备可以向第一网络设备发送第一无线能力信息。相应地，第一网络设备接收来自终端设备的第一无线能力信息。第一网络设备可以为接入网设备，也可以为核心网设备，还可以包括接入网设备和核心网设备。第一网络设备可以为初始存储终端设备的无线能力信息的网络设备。
1102.终端设备发送第一指示信息。
终端设备发送第一无线能力信息之后，可以发送第一指示信息。第一指示信息可以指示终端设备偏好使用或使用的最大DL MIMO层数为a。a可以为1，也可以为2。当终端设备通过 第一无线能力信息上报的最大DL MIMO层数为除了1和2之外其他值时，a还可以为其它值。
终端设备可以向第二网络设备发送第一指示信息。第二网络设备可以为接入网设备，也可以为核心网设备。第一网络设备与第二网络设备可以相同，也可以不同。第二网络设备可以为目标小区对应的网络设备。若第二接入网设备与第一接入网设备不同，第二接入网设备可以从第一接入网设备获取终端设备的第一无线能力信息。
终端设备可以发送连接建立请求消息或连接恢复请求消息，连接建立请求消息或连接恢复请求消息可以包括第一指示信息。可见，第一指示信息可以包含在连接建立请求消息中，也可以包含在连接恢复请求消息中。
终端设备发送第一指示信息之后，可以接收来自第二网络设备的第二指示信息，第二指示信息可以指示终端设备优先使用或使用最大DL MIMO层数为b。b可以为1，也可以为2，还可以为其它值。b可以是第二网络设备根据策略确定的。a与b可以相同，也可以不同。此时第二指示信息可以包含在连接建立消息中，也可以包含在连接恢复消息中，还可以包含在连接重建消息中。
终端设备发送第一指示信息之前，可以接收来自第三网络设备的第三指示信息，第三指示信息可以指示终端设备优先使用或使用最大DL MIMO层数为c。c可以为1，也可以为2，还可以为其它值。c可以是第三网络设备根据策略确定的。a与c可以相同，也可以不同。此时第三指示消息可以包含在连接释放消息中。第三网络设备可以为接入网设备，也可以为核心网设备。第一网络设备与第三网络设备可以相同，也可以不同。第三网络设备可以为目标小区对应的网络设备。若第三网络设备与第一网络设备不同，第三网络设备可以从第一网络设备获取终端设备的无线能力信息。
基于上述网络架构，请参阅图12，图12是本申请实施例公开的又一种通信方法的流程示意图。如图12所示，该通信方法可以包括以下步骤。
其中，图12所示的通信方法为图11所示的通信方法的一种具体的应用。以下是以终端设备具有两根天线为例进行说明的。
1201.终端设备向第一接入网设备和AMF网元发送包括最大DL MIMO层数为1和2的第一无线能力信息。
相应地，第一接入网设备和AMF网元接收来自终端设备的包括最大DL MIMO层数为1和2的第一无线能力信息。
具有两根接收天线的终端设备可以向接入网设备上报包络最大DL MIMO层数为1和2的第一无线能力信息。上报方式的详细描述可以参考步骤802。
1202.第一接入网设备和核心网设备存储第一无线能力信息。
其中，步骤1202的详细描述可以参考步骤803。
1203.第一接入网设备向终端设备发送RRC连接释放消息。
相应地，终端设备接收来自第一接入网设备的RRC连接释放消息。
当终端设备与第一接入网设备之间无信息传输时，第一接入网设备可以向终端设备发送RRC连接释放消息。RRC连接释放消息可以包括或携带有第三指示信息，第三指示信息用于指示终端设备优先使用或使用最大DL MIMO层数为c，即指示终端设备优先选择允许以最大DL MIMO层数为c接入的小区。c可以为1，也可以为2。c是由第一接入网设备根据第一接入网设备的策略决定的。策略可以包括负载等。
1204.终端设备进入空闲态或非激活态。
终端设备接收到来自第一接入网设备的RRC连接释放消息之后，可以释放掉终端设备与第一接入网设备之间的RRC连接，进而进入空闲态或非激活态。当第三指示信息包括挂起(suspend)指示时，终端设备进入非激活态。当第三指示信息不包括suspend指示时，终端设备进入空闲态。
1205.第二接入网设备向终端设备发送SIB1。
相应地，终端设备接收来自第二接入网设备的SIB1。
当RRC连接建立或RRC连接恢复的目标接入网设备为第二接入网设备时，第二接入网设备可以向终端设备发送SIB1，终端设备可以接收第二接入网设备发送的SIB1。SIB1可以包括小区的小区状态。
1206.终端设备向第二接入网设备发送包括第一指示信息的RRC建立请求(或RRC恢复请求)消息。第一指示信息用于指示终端设备偏好使用或使用的最大DL MIMO层数为a。
相应地，第二接入网设备接收来自终端设备的包括第一指示信息的RRC建立请求(或RRC恢复请求)消息。
终端设备接收到来自第二接入网设备的SIB1之后，当为RRC连接建立时，可以向第二接入网设备发送包括第一指示信息的RRC建立请求消息。当为RRC连接恢复时，可以向第二接入网设备发送包括第一指示信息的RRC恢复请求消息。
终端设备可以根据SIB1包括的小区的小区状态确定第一指示信息。例如，当小区的小区状态允许最大DL MIMO层数为a的终端设备接入时，确定第一指示信息。
终端设备也可以根据第三指示信息和SIB1包括的小区的小区状态确定第一指示信息。例如，当小区的小区状态禁止最大DL MIMO层数为c的终端设备接入时，a与c不同。当小区的小区状态允许最大DL MIMO层数为c的终端设备接入时，a与c相同。
1207.第二接入网设备从AMF网元(或第一接入网设备)检索终端设备的无线能力信息。
第二接入网设备接收到来自终端设备的包括第一指示信息的RRC建立请求消息之后，可以从AMF网元检索终端设备的无线能力信息。
第二接入网设备接收到来自终端设备的包括第一指示信息的RRC恢复请求消息之后，可以从第一接入网设备检索终端设备的无线能力信息。
1208.第二接入网设备向终端设备发送包括第二指示信息的RRC建立(或RRC恢复)消息。其中第二指示信息指示终端设备优先使用或使用最大DL MIMO层数为b。
相应地，终端设备接收来自第二接入网设备的RRC建立(或RRC恢复)消息。
第二接入网设备从AMF网元检索到终端设备的无线能力信息之后，可以根据无线能力信息调度终端设备。第二接入网设备可以根据无线能力信息和/或第一指示信息确定第二指示信息。
第二接入网设备从第一接入网设备检索终端设备的无线能力信息之后，可以根据无线能力信息调度终端设备。第二接入网设备可以根据无线能力信息和/或第一指示信息确定第二指示信息。
1209.终端设备向第二接入网设备发送RRC建立完成(或RRC恢复完成)消息。
其中，第一指示信息也可以包括在RRC建立完成(或RRC恢复完成)消息。即此时终端设备不在RRC建立请求消息或RRC恢复请求消息中包括第一指示信息，而是包含在RRC建立完成消息或RRC恢复完成消息中。在这种情况下，RRC建立消息或RRC恢复消息中可以包括第二指示信息，也可以不包含第二指示信息。
应理解，上述实施例的描述是以终端设备为非连接态为例，也适用于终端设备为连接态 且正在进行连接重建的过程。即第一指示信息可以包含在RRC连接重建请求消息或RRC连接重建完成消息中，第二指示信息可以包含在RRC连接重建过程中。
应理解，第一指示信息、第二指示信息和第三指示信息可以同时有，也可以有其中两者，还可以只有其中的一者。第一指示信息、第二指示信息和第三指示信息的详细描述可以参考图11对应的相关描述。
可见，最终使用的终端设备的无线能力可以是终端设备决定好上报给接入网设备的，也可以是接入网设备根据终端设备上报的无线能力信息选择的，还可以是终端设备和接入网设备协商确定的。
基于上述网络架构，请参阅图13，图13是本申请实施例公开的又一种通信方法的流程示意图。如图13所示，该通信方法可以包括以下步骤。
1301.终端设备向第一接入网设备和AMF网元发送包括最大DL MIMO层数为1和2的无线能力信息。
相应地，第一接入网设备和AMF网元接收来自终端设备的包括最大DL MIMO层数为1和2的无线能力信息。
其中，步骤1301的详细描述可以参考步骤1201。
1302.第一接入网设备和核心网设备存储第一无线能力信息。
其中，步骤1302的详细描述可以参考步骤803。
1303.第一接入网设备确定切换到第二接入网设备。
第一接入网设备可以根据终端设备的测量报告等信息确定将终端设备切换至第二接入网设备。
1304.第一接入网设备向第二接入网设备发送切换请求消息。
相应地，第二接入网设备接收来自第一接入网设备的切换请求消息。
切换请求包括上述无线能力信息。
1305.第二接入网设备确定接受终端设备的切换。
第二接入网设备可以根据自身负载和终端设备的无线能力信息等信息确定是否接收终端设备的切换。
此外，第二接入网设备还可以确定第一指示信息，第一指示信息用于指示终端设备优先使用或使用最大DL MIMO层数为1或2。
1306.第二接入网设备向第一接入网设备发送切换请求应答消息。
相应地，第一接入网设备接收来自第二接入网设备的切换请求应答消息。
切换请求应答可以包括第一指示信息。
1307.第一接入网设备向终端设备发送切换命令。
相应地，终端设备接收来自第一接入网设备的切换命令。
切换命令可以包括第一指示信息。
1308.终端设备与第二接入网设备建立连接。
应理解，上述不同实施例可以独立使用，也可以结合使用。
应理解，上述不同实施例或不同位置的相同信息在某些情况下，可以相互参考。
应理解，上述通信方法中由网络设备执行的功能也可以由网络设备中的模块(例如，芯片)来执行，由终端设备执行的功能也可以由终端设备中的模块(例如，芯片)来执行，由 接入网设备执行的功能也可以由接入网设备中的模块(例如，芯片)来执行，由核心网设备执行的功能也可以由核心网设备中的模块(例如，芯片)来执行。
基于上述网络架构，请参阅图14，图14是本申请实施例公开的一种通信装置的结构示意图。如图14所示，该通信装置可以包括：
发送单元1401，用于向第一网络设备发送第一无线能力信息；
发送单元1401，还用于向第二网络设备发送第二无线能力信息，第一无线能力信息和第二无线能力信息包括的最大DL MIMO层数不同。
作为一种可能的实施方式，该通信装置还可以包括：
确定单元1402，用于确定第一小区满足触发条件，第一小区可以为一个小区或多个小区。
在一个实施例中，第一小区为小区选择的当前小区，或者小区重选的候选小区中排名最高的小区；
触发条件为小区状态为禁止最大DL MIMO层数为a的终端设备接入，且允许最大DL MIMO层数为b的终端设备接入，a为第一无线能力信息包括的最大DL MIMO层数，b为第二无线能力信息包括的最大DL MIMO层数。
在一个实施例中，第一小区为满足小区选择准则的小区或满足小区重选准则的小区；
触发条件包括：没有合适小区和/或没有可接受小区。
在一个实施例中，第一小区为小区选择中满足小区选择准则的前M小区，或者小区选择中小区质量大于或等于第一阈值的小区，或者小区重选的候选小区中排列在前N位的小区，或者小区重选中小区质量大于或等于第二阈值的小区，候选小区按照小区重选准则进行排序，M为大于或等于1的整数，N为大于或等于1的整数；
触发条件包括：没有合适小区和/或没有可接受小区。
作为一种可能的实施方式，触发条件还包括：存在允许最大DL MIMO层数为b的终端设备接入的小区，b为第二无线能力信息包括的最大DL MIMO层数。
在一个实施例中，该通信装置还可以包括：
更新单元1403，用于根据第二无线能力信息更新禁止小区列表。
有关上述发送单元1401、确定单元1402和更新单元1403更详细的描述可以直接参考上述图7-图9所示的方法实施例中终端设备的相关描述直接得到，这里不加赘述。
基于上述网络架构，请参阅图15，图15是本申请实施例公开的另一种通信装置的结构示意图。如图15所示，该通信装置可以包括接收单元1501、确定单元1502、发送单元1503和获取单元1504。其中：
接收单元1501，用于接收来自接入网设备的第一小区的小区状态，第一小区为第一终端设备的当前小区或邻区，第一小区的小区状态指示允许或禁止最大DL MIMO层数为X的终端设备接入，或者指示允许或禁止具有X根接收天线的终端设备接入，X为1或2；
确定单元1502，用于根据第一小区的小区状态确定第一小区禁止或允许第一终端设备接入。
在一个实施例中，第一小区的小区状态指示允许或禁止最大DL MIMO层数为X的终端设备接入包括：
第一小区的小区状态指示允许最大DL MIMO层数为1的终端设备接入，且禁止最大DL MIMO层数为2的终端设备接入；
确定单元1502，具体用于确定第一小区允许所述第一终端设备接入，第一终端设备具有一根接收天线或两根接收天线。
在一个实施例中，发送单元1503，用于发送无线能力信息，无线能力信息包括最大DL MIMO层数为1。
在一个实施例中，第一小区的小区状态指示允许或禁止具有X根接收天线的终端设备接入包括：
第一小区的小区状态指示禁止具有两根接收天线的终端设备接入，且允许具有一根接收天线的终端设备接入；
确定单元1502具体用于：
确定第一小区禁止第一终端设备接入，所述第一终端设备具有两根接收天线；
确定第一小区允许第一终端设备接入，所述第一终端设备具有一根接收天线。
在一个实施例中，第一小区的小区状态指示允许或禁止最大DL MIMO层数为X的终端设备接入包括：
第一小区的小区状态指示禁止最大DL MIMO层数为1的终端设备接入，且允许最大DL MIMO层数为2的终端设备接入；
确定单元1502，具体用于确定第一小区允许第一终端设备接入，第一终端设备具有一根接收天线或两根接收天线。
在一个实施例中，发送单元1503，用于发送无线能力信息，无线能力信息包括最大DL MIMO层数为2。
在一个实施例中，第一小区的小区状态指示允许或禁止具有X根接收天线的终端设备接入包括：
第一小区的小区状态指示禁止具有一根接收天线的终端设备接入，且允许具有两根接收天线的终端设备接入；
确定单元1502具体用于：
确定第一小区禁止第一终端设备接入，第一终端设备具有一根接收天线；
确定第一小区允许第一终端设备接入，第一终端设备具有两根接收天线。
在一个实施例中，该通信装置还可以包括：
获取单元1504，用于获取指示信息，指示信息用于指示第一小区的小区状态指示允许或禁止最大DL MIMO层数为X的终端设备接入，或者指示第一小区的小区状态指示允许或禁止具有X根接收天线的终端设备接入；
确定单元1502，具体用于根据第一小区的小区状态和指示信息确定第一小区禁止或允许第一终端设备接入。
有关上述接收单元1501、确定单元1502、发送单元1503和获取单元1504更详细的描述可以直接参考上述图10所示的方法实施例中终端设备的相关描述直接得到，这里不加赘述。
基于上述网络架构，请参阅图16，图16是本申请实施例公开的又一种通信装置的结构示意图。如图16所示，该通信装置可以包括：
发送单元1601，用于发送第一无线能力信息，第一无线能力信息包括最大DL MIMO层数为1和2；
发送单元1601，用于发送第一指示信息，第一指示信息用于指示终端设备要使用的最大DL MIMO层数为a，a为1或2。
在一个实施例中，第一指示信息包括在连接建立请求消息或连接恢复请求消息中。
在一个实施例中，该通信装置还可以包括：
接收单元1602，用于接收第二指示信息，第二指示信息用于指示终端设备优先使用或使用最大DL MIMO层数为b，b等于1或2。
有关上述发送单元1601和接收单元1602更详细的描述可以直接参考上述图11-图12所示的方法实施例中终端设备的相关描述直接得到，这里不加赘述。
应理解，接收单元和发送单元可以统称为收发单元。
基于上述网络架构，请参阅图17，图17是本申请实施例公开的又一种通信装置的结构示意图。如图17所示，该通信装置可以包括处理器1701、存储器1702、收发器1703和总线1704。存储器1702可以是独立存在的，可以通过总线1704与处理器1701相连接。存储器1702也可以和处理器1701集成在一起。其中，总线1704用于实现这些组件之间的连接。在一种情况下，如图17所示，收发器1703可以包括发射机17031、接收机17032和天线17033。在另一种情况下，收发器1703可以包括发射器(即输出接口)和接收器(即输入接口)。发射器可以包括发射机和天线，接收器可以包括接收机和天线。
该通信装置可以为终端设备，也可以为终端设备中的模块。
在一个实施例中，存储器1702中存储的计算机程序指令被执行时，该处理器1701用于控制发送单元1401执行上述实施例中执行的操作，该处理器1701还用于执行上述实施例中确定单元1402和更新单元1403执行的操作，收发器1703用于执行上述实施例中发送单元1401执行的操作。上述通信装置还可以用于执行上述图7-图9方法实施例中终端设备执行的各种方法，不再赘述。
在另一个实施例中，存储器1702中存储的计算机程序指令被执行时，该处理器1701用于控制接收单元1501和发送单元1503执行上述实施例中执行的操作，该处理器1701还用于执行上述实施例中确定单元1502和获取单元1504执行的操作，收发器1703用于执行上述实施例中接收单元1501和发送单元1503执行的操作。上述通信装置还可以用于执行上述图10方法实施例中终端设备执行的各种方法，不再赘述。
在又一个实施例中，存储器1702中存储的计算机程序指令被执行时，该处理器1701用于控制发送单元1601和接收单元1602执行上述实施例中执行的操作，收发器1703用于执行上述实施例中发送单元1601和接收单元1602执行的操作。上述通信装置还可以用于执行上述图11和图12方法实施例中终端设备执行的各种方法，不再赘述。
基于上述网络架构，请参阅图18，图18是本申请实施例公开的又一种通信装置的结构示意图。如图18所示，该通信装置可以包括输入接口1801、逻辑电路1802和输出接口1803。输入接口1801与输出接口1803通过逻辑电路1802相连接。其中，输入接口1801用于接收来自其它通信装置的信息，输出接口1803用于向其它通信装置输出、调度或者发送信息。逻辑电路1802用于执行除输入接口1801与输出接口1803的操作之外的操作，例如实现上述实施例中处理器1701实现的功能。其中，该通信装置可以为终端设备(或终端设备内的模块)。其中，有关输入接口1801、逻辑电路1802和输出接口1803更详细的描述可以直接参考上述方法实施例中终端设备的相关描述直接得到，这里不加赘述。
本申请实施例还公开一种计算机可读存储介质，其上存储有指令，该指令被执行时执行 上述方法实施例中的方法。
本申请实施例还公开一种包括指令的计算机程序产品，该指令被执行时执行上述方法实施例中的方法。
本申请实施例还公开一种通信***，该通信***可以包括网络设备和终端设备，具体描述可以参考图7-图13所示的通信方法。
以上所述的具体实施方式，对本申请的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本申请的具体实施方式而已，并不用于限定本申请的保护范围，凡在本申请的技术方案的基础之上，所做的任何修改、等同替换、改进等，均应包括在本申请的保护范围之内。

Claims (29)

  1. 一种通信方法，其特征在于，包括：
    向第一网络设备发送第一无线能力信息；
    向第二网络设备发送第二无线能力信息，所述第一无线能力信息和所述第二无线能力信息包括的最大下行DL多输入多输出MIMO层数不同。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    确定第一小区满足触发条件，所述第一小区可以为一个小区或多个小区。
  3. 根据权利要求2所述的方法，其特征在于，所述第一小区为小区选择的当前小区，或者小区重选的候选小区中排名最高的小区；
    所述触发条件为小区状态为禁止最大DL MIMO层数为a的终端设备接入，且允许最大DL MIMO层数为b的终端设备接入，a为所述第一无线能力信息包括的最大DL MIMO层数，b为所述第二无线能力信息包括的最大DL MIMO层数。
  4. 根据权利要求2所述的方法，其特征在于，所述第一小区为满足小区选择准则的小区或满足小区重选准则的小区；
    所述触发条件包括：没有合适小区和/或没有可接受小区。
  5. 根据权利要求2所述的方法，其特征在于，所述第一小区为小区选择中满足小区选择准则的前M个小区，或者小区选择中小区质量大于或等于第一阈值的小区，或者小区重选的候选小区中排列在前N位的小区，或者小区重选中小区质量大于或等于第二阈值的小区，所述候选小区按照小区重选准则进行排序，M为大于或等于1的整数，N为大于或等于1的整数；
    所述触发条件包括：没有合适小区和/或没有可接受小区。
  6. 根据权利要求4或5所述的方法，其特征在于，所述触发条件还包括：存在允许最大DL MIMO层数为b的终端设备接入的小区，b为所述第二无线能力信息包括的最大DL MIMO层数。
  7. 根据权利要求1-6任一项所述的方法，其特征在于，所述方法还包括：
    根据所述第二无线能力信息更新禁止小区列表。
  8. 一种通信方法，其特征在于，包括：
    接收来自接入网设备的第一小区的小区状态，所述第一小区为第一终端设备的当前小区或邻区，所述小区状态指示允许或禁止最大下行DL多输入多输出MIMO层数为X的终端设备接入，或者指示允许或禁止具有X根接收天线的终端设备接入，X为1或2；
    根据所述小区状态确定所述第一小区禁止或允许所述第一终端设备接入。
  9. 根据权利要求8所述的方法，其特征在于，所述小区状态指示允许或禁止最大DL MIMO层数为X的终端设备接入包括：
    所述小区状态指示允许最大DL MIMO层数为1的终端设备接入，且禁止最大DL MIMO层数为2的终端设备接入；
    所述根据所述小区状态确定所述第一小区禁止或允许所述第一终端设备接入包括：
    确定所述第一小区允许所述第一终端设备接入，所述第一终端设备具有一根接收天线或两根接收天线。
  10. 根据权利要求9所述的方法，其特征在于，所述方法还包括：
    发送无线能力信息，所述无线能力信息包括最大DL MIMO层数为1。
  11. 根据权利要求8所述的方法，其特征在于，所述小区状态指示允许或禁止最大DL MIMO层数为X的终端设备接入包括：
    所述小区状态指示禁止最大DL MIMO层数为1的终端设备接入，且允许最大DL MIMO层数为2的终端设备接入；
    所述根据所述小区状态确定所述第一小区禁止或允许所述第一终端设备接入包括：
    确定所述第一小区允许所述第一终端设备接入，所述第一终端设备具有一根接收天线或两根接收天线。
  12. 根据权利要求11所述的方法，其特征在于，所述方法还包括：
    发送无线能力信息，所述无线能力信息包括最大DL MIMO层数为2。
  13. 根据权利要求8所述的方法，其特征在于，所述方法还包括：
    获取指示信息，所述指示信息用于指示所述小区状态指示允许或禁止最大DL MIMO层数为X的终端设备接入，或者指示所述小区状态指示允许或禁止具有X根接收天线的终端设备接入；
    所述根据所述小区状态确定所述第一小区禁止或允许所述第一终端设备接入包括：
    根据所述小区状态和所述指示信息确定所述第一小区禁止或允许所述第一终端设备接入。
  14. 一种通信装置，其特征在于，包括：
    发送单元，用于向第一网络设备发送第一无线能力信息；
    所述发送单元，还用于向第二网络设备发送第二无线能力信息，所述第一无线能力信息和所述第二无线能力信息包括的最大下行DL多输入多输出MIMO层数不同。
  15. 根据权利要求14所述的装置，其特征在于，所述装置还包括：
    确定单元，用于确定第一小区满足触发条件，所述第一小区可以为一个小区或多个小区。
  16. 根据权利要求15所述的装置，其特征在于，所述第一小区为小区选择的当前小区，或者小区重选的候选小区中排名最高的小区；
    所述触发条件为小区状态为禁止最大DL MIMO层数为a的终端设备接入，且允许最大DL MIMO层数为b的终端设备接入，a为所述第一无线能力信息包括的最大DL MIMO层数，b为所述第二无线能力信息包括的最大DL MIMO层数。
  17. 根据权利要求15所述的装置，其特征在于，所述第一小区为满足小区选择准则的小区或满足小区重选准则的小区；
    所述触发条件包括：没有合适小区和/或没有可接受小区。
  18. 根据权利要求17所述的装置，其特征在于，所述第一小区为小区选择中满足小区选择准则的前M个小区，或者小区选择中小区质量大于或等于第一阈值的小区，或者小区重选的候选小区中排列在前N位的小区，或者小区重选中小区质量大于或等于第二阈值的小区，所述候选小区按照小区重选准则进行排序，M为大于或等于1的整数，N为大于或等于1的整数；
    所述触发条件包括：没有合适小区和/或没有可接受小区。
  19. 根据权利要求17或18所述的装置，其特征在于，所述触发条件还包括：存在允许最大DL MIMO层数为b的终端设备接入的小区，b为所述第二无线能力信息包括的最大DL MIMO层数。
  20. 根据权利要求14-19任一项所述的装置，其特征在于，所述装置还包括：
    更新单元，用于根据所述第二无线能力信息更新禁止小区列表。
  21. 一种通信装置，其特征在于，包括：
    接收单元，用于接收来自接入网设备的第一小区的小区状态，所述第一小区为第一终端设备的当前小区或邻区，所述小区状态指示允许或禁止最大下行DL多输入多输出MIMO层数为X的终端设备接入，或者指示允许或禁止具有X根接收天线的终端设备接入，X为1或2；
    确定单元，用于根据所述小区状态确定所述第一小区禁止或允许所述第一终端设备接入。
  22. 根据权利要求21所述的装置，其特征在于，所述小区状态指示允许或禁止最大DL MIMO层数为X的终端设备接入包括：
    所述小区状态指示允许最大DL MIMO层数为1的终端设备接入，且禁止最大DL MIMO层数为2的终端设备接入；
    所述确定单元，具体用于确定所述第一小区允许所述第一终端设备接入，所述第一终端设备具有一根接收天线或两根接收天线。
  23. 根据权利要求22所述的装置，其特征在于，所述装置还包括：
    第一发送单元，用于发送无线能力信息，所述无线能力信息包括最大DL MIMO层数为1。
  24. 根据权利要求21所述的装置，其特征在于，所述小区状态指示允许或禁止最大DL MIMO层数为X的终端设备接入包括：
    所述小区状态指示禁止最大DL MIMO层数为1的终端设备接入，且允许最大DL MIMO层数为2的终端设备接入；
    所述确定单元，具体用于确定所述第一小区允许所述第一终端设备接入，所述第一终端设备具有一根接收天线或两根接收天线。
  25. 根据权利要求24所述的装置，其特征在于，所述装置还包括：
    第二发送单元，用于发送无线能力信息，所述无线能力信息包括最大DL MIMO层数为2。
  26. 根据权利要求21所述的装置，其特征在于，所述装置还包括：
    获取单元，用于获取指示信息，所述指示信息用于指示所述小区状态指示允许或禁止最大DL MIMO层数为X的终端设备接入，或者指示所述小区状态指示允许或禁止具有X根接收天线的终端设备接入；
    所述确定单元，具体用于根据所述小区状态和所述指示信息确定所述第一小区禁止或允许所述第一终端设备接入。
  27. 一种通信装置，其特征在于，包括处理器、存储器，所述处理器和存储器耦合，所述处理器调用所述存储器中存储的计算机程序实现如权利要求1-13任一项所述的方法。
  28. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质中存储有计算机程序或计算机指令，当所述计算机程序或计算机指令被运行时，实现如权利要求1-13任一项所述的方法。
  29. 一种计算机程序产品，其特征在于，所述计算机程序产品包括计算机程序代码，当所述计算机程序代码被运行时，实现如权利要求1-13任一项所述的方法。
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