CN115529624A - Mobility management method and communication device - Google Patents

Mobility management method and communication device Download PDF

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Publication number
CN115529624A
CN115529624A CN202110714815.6A CN202110714815A CN115529624A CN 115529624 A CN115529624 A CN 115529624A CN 202110714815 A CN202110714815 A CN 202110714815A CN 115529624 A CN115529624 A CN 115529624A
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China
Prior art keywords
cell
target cell
condition
target
signal quality
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Chinese (zh)
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顾志方
娄崇
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN202110714815.6A priority Critical patent/CN115529624A/en
Priority to PCT/CN2022/095525 priority patent/WO2022267818A1/en
Publication of CN115529624A publication Critical patent/CN115529624A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/36—Reselection control by user or terminal equipment
    • H04W36/362—Conditional handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The application provides a mobility management method and a communication device, wherein the method comprises the following steps: the terminal equipment receives first configuration information from first network equipment, wherein the first configuration information comprises measurement configuration information of candidate cells; the terminal equipment measures the candidate cells according to the measurement configuration information; the terminal equipment determines a target cell according to the measurement result and at least one of a first condition and a second condition, wherein the target cell is one of candidate cells, and the target cell meets the first condition and/or the second condition; the terminal device sends first indication information to the first network device, wherein the first indication information indicates whether to switch to the target cell and/or whether to add the target cell as a serving cell. By the method, the time delay of the switching process or the process of adding the target cell as the service cell can be reduced.

Description

Mobility management method and communication device
Technical Field
The present application relates to the field of wireless communications technologies, and in particular, to a mobility management method and a communications apparatus.
Background
In the high-frequency beamforming scenario, the terminal device needs to perform cell handover frequently due to the movement of the terminal device and the limited beam coverage. In a conventional Handover process without Conditional Handover (CHO), communication quality between a terminal device and a network device may be poor at a time when Handover occurs, thereby easily causing Handover failure. In the switching process configured with the CHO, when the communication quality is good, the source network device may send the neighboring cell configuration and the switching condition to the terminal device in advance, and the terminal device performs the switching when the switching condition is satisfied, thereby improving the robustness of the switching to a certain extent. However, in the handover process configured with the CHO, the problems that the beam alignment mechanism is not efficient enough and the beam direction is not accurate enough still exist, so that the handover delay is increased, and even the handover fails.
Disclosure of Invention
The application provides a mobility management method and a communication device, which are used for reducing time delay and improving communication quality.
In a first aspect, embodiments of the present application provide a mobility management method, which may be performed by a terminal device, or may be performed by a component (e.g., a chip or a circuit) configured in the terminal device.
The method comprises the following steps: receiving first configuration information from a first network device, the first configuration information comprising measurement configuration information of a candidate cell; measuring the candidate cell according to the measurement configuration information; determining a target cell according to the measurement result and at least one of a first condition and a second condition, wherein the target cell is one of the candidate cells, and the target cell meets the first condition and/or the second condition; and sending first indication information to the first network equipment, wherein the first indication information indicates whether to switch to the target cell and/or whether to add the target cell as a serving cell. By implementing the method described in the first aspect, the terminal device may determine whether to switch to the target cell or add the target cell as the serving cell according to the measurement result of the cell level and/or the beam level, without waiting for the switch command of the network device or the command of adding the serving cell, and may simplify the signaling interaction process in the process of switching or adding the serving cell, thereby reducing the time delay. In addition, the terminal equipment performs the beam management process of the target cell before the switching is completed or the target cell is added, and after the terminal equipment is switched to the target cell, data transmission can be performed in the preferred beam direction, so that high-capacity data transmission can be immediately maintained after the switching, and the communication quality is improved.
In a possible design of the first aspect, the determining the target cell according to the measurement result and at least one of the first condition and the second condition includes: and determining whether to switch to the target cell according to the measurement result and the first condition.
In one possible design of the first aspect, the first condition includes at least one of:
the cell-level signal quality of the target cell is higher than a first threshold value;
the difference between the cell-level signal quality of the target cell and the cell-level signal quality of a serving cell is higher than a second threshold value, and the serving cell serves the terminal equipment before handover;
the signal quality of one or more beams of the target cell is above a third threshold;
the difference between the signal quality of one or more beams of the target cell and the signal quality of the beam used by the terminal device in the serving cell is higher than a fourth threshold value;
the difference between the signal quality of one or more beams of the target cell and the signal quality of the strongest beam in the serving cell is above a fifth threshold value.
In a possible design of the first aspect, the first configuration information includes the second condition, the first configuration information includes the first condition, and the determining the target cell according to the measurement result and at least one of the first condition and the second condition specifically includes: and determining whether to add the target cell as a serving cell according to the measurement result and the second condition.
In one possible design of the first aspect, the second condition includes at least one of:
the cell-level signal quality of the target cell is higher than a sixth threshold, and the cell-level signal quality of the serving cell is higher than the sixth threshold; the signal quality of the one or more beams of the target cell is above a seventh threshold, and the signal quality of the one or more beams of the serving cell is above a seventh threshold.
In one possible design of the first aspect, the target cell is added as a serving cell when the second condition is met; or, when the second condition is satisfied, the target cell is not added as a serving cell, and the resource of the target cell is used for data transmission.
In one possible design of the first aspect, the first indication information further includes at least one of:
a cell identity of the target cell;
a reference signal identifier corresponding to a target beam direction in the target cell;
a measurement result of a serving cell, the serving cell serving the terminal device before handover, the measurement result being a cell level measurement result and/or a beam level measurement result;
a measurement result of at least one of the candidate cells, the measurement result being a cell-level measurement result and/or a beam-level measurement result.
In one possible design of the first aspect, the first network device is a source network device.
In one possible design of the first aspect, the method further includes: and receiving a response message from the target network equipment, wherein the response message is used for indicating whether the target network equipment agrees to the decision that the terminal equipment is switched to the target cell or adds the target cell as a serving cell.
In one possible design of the first aspect, different antenna panels are used for communication at different stages for terminal devices with multiple antenna panel capabilities. Illustratively, the terminal device employs a dual-antenna panel when receiving the response information from the target network device, and employs a single-antenna panel when communicating with the first network device.
The terminal equipment monitors scheduling and/or response information of a source serving cell and a target cell simultaneously in a cell switching process by starting the dual-antenna panel, and the terminal can continuously monitor the scheduling and/or response information of the source serving cell under the condition of switching failure such as refusal of a cell switching request, so that the probability of cell reselection is reduced, and the reliability of the switching process is improved.
In a second aspect, embodiments of the present application provide a mobility management method, which may be performed by a first network device, or may be performed by a component (e.g., a chip or a circuit) configured in the first network device.
The method comprises the following steps: sending configuration information to a terminal device, where the configuration information includes measurement configuration information of candidate cells, the measurement configuration information is used for the terminal device to measure the candidate cells, a target cell is one of the candidate cells, and the target cell meets a first condition and/or a second condition; and receiving first indication information from the terminal equipment, wherein the first indication information indicates whether to switch to the target cell and/or whether to add the target cell as a serving cell.
In one possible design of the second aspect, the first configuration information includes the first condition, and the first condition is used to determine whether to handover to the target cell.
In one possible design of the second aspect, the first condition includes at least one of:
the cell-level signal quality of the target cell is higher than a first threshold value;
the difference between the cell-level signal quality of the target cell and the cell-level signal quality of a serving cell is higher than a second threshold value, and the serving cell serves the terminal device before handover;
the signal quality of one or more beams of the target cell is above a third threshold;
the difference between the signal quality of one or more beams of the target cell and the signal quality of the beam used by the terminal device in the serving cell is higher than a fourth threshold value;
the difference between the signal quality of one or more beams of the target cell and the signal quality of the strongest beam in the serving cell is above a fifth threshold value.
In one possible design of the second aspect, the configuration information includes a second condition for determining whether to add the target cell as a serving cell.
In one possible design of the second aspect, the second condition includes at least one of:
the cell-level signal quality of the target cell is higher than a sixth threshold, and the cell-level signal quality of the serving cell is higher than the sixth threshold;
the signal quality of the one or more beams of the target cell is above a seventh threshold, and the signal quality of the one or more beams of the serving cell is above a seventh threshold.
In one possible design of the second aspect, the first indication information further includes at least one of:
a cell identity of the target cell;
a reference signal identifier corresponding to a target beam direction in the target cell;
a measurement result of a serving cell, the serving cell serving the terminal device before handover, the measurement result being a cell level measurement result and/or a beam level measurement result;
a measurement result of at least one of the candidate cells, the measurement result being a cell-level measurement result and/or a beam-level measurement result.
In one possible design of the second aspect, the first network device is a source network device.
In a possible design of the second aspect, the method further includes sending a handover request message to a candidate network device, the request message requesting configuration information of the candidate cell, the candidate cell belonging to the candidate network device;
receiving configuration information of the candidate cell from the candidate network device.
In one possible design of the second aspect, the method further includes: sending second indication information to a target network device, wherein the target cell belongs to the target network device, and the second indication information comprises at least one of the following items:
the terminal equipment decides whether to switch;
a cell identity of the target cell;
a reference signal identifier corresponding to a target beam direction in the target cell;
cell-level measurements and/or beam-level measurements of the target cell.
In a possible design of the second aspect, the information that the terminal device decides whether to perform handover specifically includes:
not executing the switching; or the like, or, alternatively,
not executing switching, and adding the target cell as a service cell; or the like, or, alternatively,
and performing no switching, and performing data transmission by using the resources of the target cell.
In one possible design of the second aspect, the method further includes:
receiving fourth indication information from a target network device, wherein the fourth indication information indicates whether to approve the switching decision of the terminal device.
In a third aspect, embodiments of the present application provide a mobility management method, which may be performed by a terminal device, or may be performed by a component (e.g., a chip or a circuit) configured in the terminal device.
The method comprises the following steps: receiving first configuration information from a first network device, the first configuration information comprising measurement configuration information of a candidate cell; measuring the candidate cell according to the measurement configuration information; determining a target cell according to the measurement result and at least one of a first condition and a second condition, wherein the target cell is one of the candidate cells, and the target cell meets the first condition and/or the second condition; and sending third indication information to target network equipment, wherein the third indication information indicates whether to switch to the target cell and/or whether to add the target cell as a serving cell.
By implementing the method of the third aspect, in a cross-site scenario (that is, the target cell and the source serving cell belong to different network devices), the terminal device may determine whether to switch to the target cell or add the target cell as the serving cell according to the measurement result of the cell level and/or the beam level, without waiting for a switching command of the network device or a command of adding the serving cell, and may simplify a signaling interaction process in the process of switching or adding the serving cell, thereby reducing the time delay. In addition, the terminal equipment performs the beam management process of the target cell before the switching is completed, and after the terminal equipment is switched to the target cell, data transmission can be performed in the preferred beam direction, so that high-capacity data transmission can be immediately maintained after the switching, and the communication quality is improved.
In one possible design of the third aspect, the first network device is a source network device.
In a possible design of the third aspect, the determining, according to the measurement result and at least one of the first condition and the second condition, the target cell according to the first configuration information includes: and determining whether to switch to the target cell according to the measurement result and the first condition.
In one possible design of the third aspect, the first condition includes at least one of:
the cell-level signal quality of the target cell is higher than a first threshold value;
the difference between the cell-level signal quality of the target cell and the cell-level signal quality of a serving cell is higher than a second threshold value, and the serving cell serves the terminal equipment before handover;
a signal quality of one or more beams of the target cell is above a third threshold;
the difference between the signal quality of one or more beams of the target cell and the signal quality of the beam used by the terminal device in the serving cell is higher than a fourth threshold value;
the difference between the signal quality of one or more beams of the target cell and the signal quality of the strongest beam in the serving cell is above a fifth threshold value.
In a possible design of the third aspect, the first configuration information includes the second condition, the first configuration information includes the first condition, and the determining, according to the measurement result and at least one of the first condition and the second condition, the target cell specifically includes: and determining whether to add the target cell as a serving cell according to the measurement result and the second condition.
In one possible design of the third aspect, the second condition includes at least one of:
the cell-level signal quality of the target cell is higher than a sixth threshold, and the cell-level signal quality of the serving cell is higher than the sixth threshold;
the signal quality of the one or more beams of the target cell is above a seventh threshold, and the signal quality of the one or more beams of the serving cell is above a seventh threshold.
In one possible design of the third aspect, when the second condition is met, adding the target cell as a serving cell; or the like, or a combination thereof,
and when the second condition is met, the target cell is not added as a service cell, and the resources of the target cell are used for data transmission.
In one possible design of the third aspect, the third indication information further includes at least one of:
a cell identity of the target cell;
a reference signal identifier corresponding to a target beam direction in the target cell;
cell-level measurements and/or beam-level measurements of the target cell.
In a fourth aspect, embodiments of the present application provide a mobility management method, which may be performed by a first network device, or may be performed by a component (e.g., a chip or a circuit) configured in the first network device.
The method comprises the following steps: sending configuration information to a terminal device, where the configuration information includes measurement configuration information of candidate cells, the measurement configuration information is used for the terminal device to measure the candidate cells, the target cell is one of the candidate cells, and the target cell meets a first condition and/or a second condition.
In one possible design of the fourth aspect, the first configuration information includes the first condition, and the first condition is used to determine whether to handover to the target cell.
In one possible design of the fourth aspect, the first condition includes at least one of:
the cell-level signal quality of the target cell is higher than a first threshold value;
the difference between the cell-level signal quality of the target cell and the cell-level signal quality of a serving cell is higher than a second threshold value, and the serving cell serves the terminal device before handover;
the signal quality of one or more beams of the target cell is above a third threshold;
the difference between the signal quality of one or more beams of the target cell and the signal quality of the beam used by the terminal device in the serving cell is higher than a fourth threshold value;
the difference between the signal quality of one or more beams of the target cell and the signal quality of the strongest beam in the serving cell is above a fifth threshold value.
In one possible design of the fourth aspect, the configuration information includes a second condition for determining whether to add the target cell as a serving cell.
In one possible design of the fourth aspect, the second condition includes at least one of:
the cell-level signal quality of the target cell is higher than a sixth threshold, and the cell-level signal quality of the serving cell is higher than the sixth threshold;
the signal quality of the one or more beams of the target cell is above a seventh threshold, and the signal quality of the one or more beams of the serving cell is above a seventh threshold.
In one possible design of the fourth aspect, the first indication information further includes at least one of:
a cell identity of the target cell;
a reference signal identifier corresponding to a target beam direction in the target cell;
a measurement result of a serving cell, the serving cell serving the terminal device before handover, the measurement result being a cell level measurement result and/or a beam level measurement result;
a measurement result of at least one of the candidate cells, the measurement result being a cell-level measurement result and/or a beam-level measurement result.
In one possible design of the fourth aspect, the first network device is a source network device.
In a possible design of the fourth aspect, the method further includes sending a handover request message to a candidate network device, the request message requesting configuration information of the candidate cell, the candidate cell belonging to the candidate network device;
receiving configuration information of the candidate cell from the candidate network device.
In one possible design of the fourth aspect, the method further includes: sending second indication information to a target network device, wherein the target cell belongs to the target network device, and the second indication information includes at least one of the following information:
the terminal equipment decides whether to switch;
a cell identity of the target cell;
a reference signal identifier corresponding to a target beam direction in the target cell;
cell-level measurements and/or beam-level measurements of the target cell.
In a possible design of the fourth aspect, the information that the terminal device decides whether to perform handover specifically includes:
the switching is not executed; or the like, or, alternatively,
not executing switching, and adding the target cell as a service cell; or the like, or, alternatively,
and performing no switching, and performing data transmission by using the resources of the target cell.
In one possible design of the fourth aspect, the method further includes:
receiving fourth indication information from a target network device, wherein the fourth indication information indicates whether to approve the switching decision of the terminal device.
In a fifth aspect, a communication device is provided, which includes functional modules configured to implement the methods in the foregoing first aspect, any possible implementation manner of the first aspect, and any possible implementation manner of the third aspect.
A sixth aspect provides a communication device comprising functional modules for implementing the methods in the foregoing second aspect, any possible implementation manner of the second aspect, the fourth aspect, and any possible implementation manner of the fourth aspect.
In a seventh aspect, a communication device is provided, which includes a processor and a memory, where the processor and the memory are coupled, and the processor is configured to control the device to implement the method in the foregoing first aspect, any possible implementation manner of the first aspect, and any possible implementation manner of the third aspect.
In an eighth aspect, there is provided a communication apparatus comprising a processor and a memory, the processor and the memory being coupled, the processor being configured to control the apparatus to implement the method of the foregoing second aspect, any possible implementation manner of the second aspect, and any possible implementation manner of the fourth aspect.
In a ninth aspect, there is provided a communication device, comprising a processor and an interface circuit, wherein the interface circuit is configured to receive a signal from a communication device other than the communication device and transmit the signal to the processor or transmit the signal from the processor to the communication device other than the communication device, and the processor is configured to implement the method in any possible implementation manner of the first aspect, the third aspect, and the third aspect through a logic circuit or executing a code instruction.
In a tenth aspect, a communication device is provided, which includes a processor and an interface circuit, the interface circuit is configured to receive and transmit signals from other communication devices except the communication device to the processor or transmit signals from the processor to other communication devices except the communication device, and the processor is configured to implement, through logic circuits or executing code instructions, a method of the method in any possible implementation manner of the foregoing second aspect, the fourth aspect, and the fourth aspect.
In an eleventh aspect, a computer-readable storage medium is provided, having stored thereon a computer program or instructions that, when executed, implement the method of any possible implementation of the method of the foregoing first aspect, third aspect, or any possible implementation of the third aspect.
In a twelfth aspect, a computer-readable storage medium is provided, in which a computer program or instructions are stored, which, when executed, implement the method of the foregoing second aspect, any possible implementation manner of the second aspect, the fourth aspect, or any possible implementation manner of the fourth aspect.
In a thirteenth aspect, there is provided a computer program product comprising instructions that, when executed, implement the method in the foregoing first aspect, any possible implementation manner of the first aspect, the third aspect, or any possible implementation manner of the third aspect.
A fourteenth aspect provides a computer program product comprising instructions that, when executed, implement the method of the foregoing second aspect, any possible implementation manner of the second aspect, or any possible implementation manner of the fourth aspect.
A fifteenth aspect provides a computer program comprising code or instructions that, when executed, implement the method of any possible implementation of the aforementioned first, third, or third aspects.
A sixteenth aspect provides a computer program comprising code or instructions that, when executed, implement the aforementioned second aspect, the method of any possible implementation of the second aspect, the fourth aspect, the method of any possible implementation of the fourth aspect.
A seventeenth aspect provides a chip system, where the chip system includes a processor, and may further include a memory, configured to implement at least one of the methods described in the foregoing first aspect, any possible implementation manner of the first aspect, the second aspect, any possible implementation manner of the second aspect, the third aspect, any possible implementation manner of the third aspect, the fourth aspect, and any possible implementation manner of the fourth aspect. The chip system may be formed by a chip, and may also include a chip and other discrete devices. An eighteenth aspect provides a communication system comprising the apparatus of the fifth aspect, the seventh aspect or the ninth aspect, and the apparatus of the sixth aspect, the eighth aspect or the tenth aspect.
Drawings
Fig. 1 is a schematic network architecture of a communication system according to an embodiment of the present application;
fig. 2 is a schematic diagram of a CU-DU separation architecture adopted by an access network device in an embodiment of the present application;
fig. 3 is a schematic flow chart of conditional handover according to an embodiment of the present application;
fig. 4 is a flowchart illustrating a mobility management method according to an embodiment of the present application;
fig. 5 is a flowchart illustrating another mobility management method according to an embodiment of the present application;
fig. 6 is a flowchart illustrating another mobility management method according to an embodiment of the present application;
fig. 7, fig. 8, and fig. 9 are schematic structural diagrams of a communication device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.
The technical solution of the embodiment of the present application may be applied to various communication systems, such as a Universal Mobile Telecommunications System (UMTS) system, a Code Division Multiple Access (CDMA) system, a Wireless Local Area Network (WLAN), a Long Term Evolution (LTE) system, a LTE Frequency Division Duplex (FDD) system, a LTE Time Division Duplex (TDD), a fifth generation (5 th generation,5 g) mobile communication system or a New Radio (NR) system, or a future communication system or other similar communication systems.
Please refer to fig. 1, which is a schematic diagram of a network architecture of a communication system provided in the present application, where the communication system includes an access network device and a terminal device. The terminal device is located in the coverage area of one or more cells (carriers) provided by the access network device, and there may be one or more cells serving the terminal device. When there are multiple cells serving the terminal device, the terminal device may operate in Carrier Aggregation (CA) or Dual Connectivity (DC) or coordinated multiple point transmission (CoMP), and at least one cell may provide the terminal device with radio resources corresponding to more than one transmission parameter set. For example, as shown in fig. 1, the terminal device 110 is located in a cell of the access network device 120, a cell of the access network device 130, and a cell of the access network device 140 at the same time, the access network device 120 may be a macro base station (e.g., macro eNB), and the access network device 130 and the access network device 140 may be micro base stations (e.g., small enbs). It should be noted that fig. 1 is only a schematic diagram, and other network devices, such as a core network device, a wireless relay device, a wireless backhaul device, etc., may also be included in the communication system, which is not shown in fig. 1.
The embodiments of the present application do not limit the number of access network devices, terminal devices, core network devices, and other network devices included in the communication system.
The access network device in the embodiment of the present application may correspond to different devices in different types or systems of communication systems, for example, in a 5G system, the access network device in 5G (e.g., a gNB or an ng-eNB) corresponds to, and in a 4G system, the access network device in 4G (e.g., an eNB or an en-gNB) corresponds to.
The access network device and the terminal device can communicate through a licensed spectrum, can communicate through an unlicensed spectrum, and can communicate through both the licensed spectrum and the unlicensed spectrum. The access network device and the terminal device may communicate with each other through a frequency spectrum of less than 6 gigahertz (GHz), may communicate through a frequency spectrum of more than 6GHz, and may communicate using both a frequency spectrum of less than 6GHz and a frequency spectrum of more than 6 GHz. The frequency spectrum resource used between the access network device and the terminal device is not limited in the embodiment of the application.
The access network equipment and the terminal equipment in the embodiment of the application can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; can also be deployed on the water surface; it may also be deployed on airborne airplanes, balloons and satellite vehicles. The application scenarios of the access network device and the terminal device are not limited in the embodiments of the present application.
It should be noted that the network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not constitute a limitation to the technical solution provided in the embodiment of the present application, and it is known by a person of ordinary skill in the art that, with the evolution of the communication network architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.
Some terms in the embodiments of the present application are explained below to facilitate understanding by those skilled in the art.
1) The terminal device referred to in the embodiments of the present application may also be referred to as a terminal, a User Equipment (UE), a mobile station, a mobile terminal, and the like, and is a device that provides voice and/or data connectivity to a user, for example, a handheld device, a vehicle-mounted device, and the like with a wireless connection function. The terminal equipment is connected with the access network equipment in a wireless mode so as to access the communication system. Some examples of the terminal devices include: the mobile terminal comprises a mobile phone, a tablet computer, a computer with a wireless transceiving function, a palm computer, a mobile internet device, a wearable device, a virtual reality terminal device, an augmented reality terminal device, a wireless terminal in industrial control, a wireless terminal in unmanned operation, a wireless terminal in remote operation, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home and the like. The embodiment of the present application does not limit the specific technology and the specific device form adopted by the terminal device.
By way of example, and not limitation, the terminal device may also be a wearable device. Wearable equipment can also be called wearable smart device or intelligent wearable equipment etc. is the general term of using wearable technique to carry out intelligent design, develop the equipment that can dress to daily wearing, like glasses, gloves, wrist-watch, dress and shoes etc.. A wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction and cloud interaction. The generalized wearable smart device includes full functionality, large size, and can implement full or partial functionality without relying on a smart phone, such as: smart watches or smart glasses and the like, and only focus on a certain type of application functions, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets, smart helmets, smart jewelry and the like for monitoring physical signs.
The terminal device may also be an on-board module, an on-board component, an on-board chip or an on-board unit built into the vehicle as one or more components or units, by which the vehicle may implement the method of the present application.
2) The access network device, which may also be referred to as a base station in this embodiment of the present application, is a node or a device in a Radio Access Network (RAN) for accessing a terminal device to a wireless network. Some examples of access network devices include: a base station (base station), an evolved NodeB (eNB) in an LTE system or an evolved LTE system (LTE-Advanced, LTE-a), a next generation base station (next generation NodeB, gNB) in a 5G communication system, a Transmission Reception Point (TRP), a Node B (NB), a Radio Network Controller (RNC), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a home base station (home, nodeB), a Base Band Unit (BBU), a wireless fidelity (WiFi) access point (access point, AP), a base station in a future mobile communication system, and the like. The access network device may also be a module or unit that performs part of the functions of the base station, and may be, for example, a Centralized Unit (CU) or a Distributed Unit (DU). The embodiment of the present application does not limit the specific technology and the specific device form adopted by the network access device.
The access network device in the embodiment of the present application may adopt a CU-DU separation architecture, which may also be referred to as a distributed deployment architecture. For example, as shown in fig. 2, the access network device may logically include one CU and one or more DUs, each DU may be connected to the CU through the F1 interface, and information exchange between different DUs may be performed based on forwarding of the CU. The CU and the DU may be physically provided together or may be physically provided separately, and are not limited. The CU may support Radio Resource Control (RRC), packet Data Convergence Protocol (PDCP), and Service Data Adaptation Protocol (SDAP) functions; the DU may support functions of a Radio Link Control (RLC) layer protocol, a Medium Access Control (MAC) layer protocol, and a Physical (PHY) layer protocol.
In the embodiment of the present application, a Physical Downlink Shared Channel (PDSCH), a Physical Downlink Control Channel (PDCCH), a Physical Uplink Shared Channel (PUSCH), and a Physical Uplink Control Channel (PUCCH) are merely examples of a downlink data channel, a downlink control channel, an uplink data channel, and an uplink control channel of a physical layer, and in different systems and different scenarios, the data channel and the control channel may have different names, which is not limited in the present application.
It should be noted that the terms "system" and "network" in the embodiments of the present application may be used interchangeably. "plurality" means two or more, and in view of this, a plurality may also be understood as "at least two" in the embodiments of the present application. "at least one" is to be understood as meaning one or more, for example one, two or more. For example, the inclusion of at least one is meant to include one, two or more, and is not limiting of which are included. For example, including A, B and C, then included may be A, B, C, a and B, a and C, B and C, or a and B and C. Similarly, the understanding of the description of "at least one" and the like is similar. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" generally indicates that the preceding and following related objects are in an "or" relationship, unless otherwise specified.
Unless stated to the contrary, the embodiments of the present application refer to the ordinal numbers "first", "second", etc., for distinguishing between a plurality of objects, and do not define the order, sequence, priority, or importance of the plurality of objects, and the descriptions of "first", "second", etc., do not define that the objects are necessarily different.
The following explains related-art features involved in the embodiments of the present application.
Control resource set (CORESET): the time-frequency resource set can be understood as a time-frequency resource set, and is used for indicating a resource location for Physical Downlink Control Channel (PDCCH) transmission, including the number of time-domain symbols occupied by the PDCCH, the number of resource blocks in a frequency domain, and allocation of time slots. In time domain, 1 CORESET may be configured as 1 or several consecutive OFDM symbols; in the frequency domain, 1 CORESET may be a set of contiguous or non-contiguous frequency domain resources, containing search spaces at different aggregation levels.
Search Space (SS): the period and specific resource information for indicating the appearance of the CORESET, such as the starting slot in symbol, and the period of repeated appearance, so that the terminal device can monitor the PDCCH in the resource position of the indicated search space, and one search space can be associated with at least one CORESET.
Beam management (beam management): multiple antennas perform beamforming, and by changing the phase and amplitude of the signal for each antenna, a beam can be directed in a particular direction. For the NR system, all the uplink and downlink channels are transmitted and received based on beams, so beam management is required, and both ends of the transceiver can transmit and receive data on the most suitable beams, thereby improving signal strength, avoiding signal interference, and improving communication quality.
The beam management mechanism may include the following processes: 1) Beam scanning: transmitting beams of reference signals, and performing spatial scanning at predefined time intervals; 2) Beam measurement/decision: the terminal device measures the reference signal and selects the best beam. 3) And (3) beam reporting: the terminal equipment reports the result of the beam measurement; 4) Beam indication: the access network device instructs the terminal device to select the designated beam.
The reference signal for beam management may include: a synchronization signal and physical broadcast channel block (SSB) in a downlink direction, a channel state information reference signal (CSI-RS), and a PRACH and channel Sounding Reference Signal (SRS) in an uplink direction, wherein the SSB may be applicable to an idle initial access state or a connected state, the PRACH may be applicable to an idle initial access state, and the CSI-RS and the SRS may be applicable to a connected state.
Multi-antenna panel terminal equipment: millimeter-wave capable terminal devices may compress the MIMO array in one antenna panel, may place multiple panels together to form a large antenna array of high correlation, or may separate them as much as possible to maintain low correlation. Each antenna panel may form its own beam, each directed to a desired access network device.
Quasi co-location (QCL): if the channel characteristics on a certain antenna port symbol can be derived from another antenna port, then the two antenna ports are regarded as QCLs, and the two antenna ports are regarded as QCLs, i.e. the channel estimation result obtained from one antenna port can be used for the other antenna port, which is beneficial for the receiver processing. In particular, QCL may also be used to indicate that the signals transmitted by the two antenna ports have the same beam direction.
Conditional Handover (CHO) procedure
Before a terminal device switches from one network device to another network device, a network device that provides services for at least one radio bearer RB of the terminal device may be referred to as a source network device; the network device serving the at least one RB of the terminal device after the handover may be referred to as a target network device. FIG. 3 shows a schematic flow diagram of CHO, comprising:
s301, the source network device sends a handover request message to the candidate network device, and correspondingly, the candidate network device receives the handover request message from the source network device. One or more candidate network devices may be provided, and the target network device is included in the one or more candidate network devices.
S302, the candidate network device sends the configuration information of the candidate cell to the source network device, and correspondingly, the source network device receives the configuration information of the candidate cell.
S303, the source network device sends an RRC reconfiguration message to the terminal device, and the terminal device receives the RRC reconfiguration message from the source network device. Wherein the RRC reconfiguration message includes configuration information of the candidate cell and a condition for performing handover.
S304, the terminal device sends an RRC reconfiguration complete message to the source network device, and the source network device receives the RRC reconfiguration complete message from the terminal device. Wherein the RRC reconfiguration complete message includes a conditional handover configuration confirm message.
S305, the terminal device measures the candidate cell and the serving cell, and determines whether a condition for performing the conditional handover is satisfied according to the measurement result. In this embodiment, the serving cell refers to a cell serving the terminal device before handover, and the network device to which the serving cell belongs is the first network device. In the embodiment of the present application, the "serving cell" may also be referred to as a "current serving cell", "source cell", or "source serving cell".
S306, if the terminal equipment judges that the condition for executing the condition switching is met according to the measurement result, the terminal equipment is disconnected with the source network equipment and is accessed to the target network equipment through the random access process.
S307, when the terminal device is successfully accessed to the target network device, the switching is completed. The terminal device finishes the switching process by sending an RRC reconfiguration complete message to the target network device.
S308, the target network device sends the indication information of successful switching to the source network device.
In the above S306, the terminal device accesses the target network device through the random access procedure. The random access mode may be contention-based random access or non-contention-based random access.
Wherein the non-contention based random access procedure may include: the source network device configures SSB or CSI-RS resources of a target network device for a terminal device, and time-frequency resources corresponding to the SSB or CSI-RS resources and used for sending a preamble (preamble), wherein the number of the SSB or CSI-RS resources can be one or more. Taking the configuration of two SSBs as an example, the terminal device measures the two SSBs, where different SSBs correspond to different beam directions, the terminal device selects one SSB from the two SSBs according to the measurement result, and the terminal device sends a preamble on the time-frequency resource corresponding to the selected SSB. If the signal quality measurement results of the two configured SSB resources are both lower than a threshold value (which may be pre-configured by the source network device), the terminal device will employ contention-based random access.
The contention-based random access procedure may include: the method comprises the steps that the terminal equipment respectively measures a plurality of SSBs of target network equipment configured by source network equipment, wherein different SSBs correspond to different beam directions; the terminal equipment selects one SSB from the plurality of SSBs according to the measurement result; the terminal equipment sends the preamble at the time-frequency position corresponding to the selected SSB, and as the SSB and the time-frequency position for sending the preamble have a corresponding relation, the target network equipment can know the SSB/wave beam direction selected by the terminal equipment.
In S305, the terminal device determines whether the candidate cell satisfies the handover condition according to the cell-level measurement result, and then decides whether to handover to the candidate cell satisfying the handover condition (i.e., the target cell). That is, if the terminal device completes cell handover by the method shown in fig. 3, the terminal device cannot determine the situation of each beam of the target cell before handover to the target cell, and only can achieve preliminary beam alignment with the target cell through the random access process. When the terminal equipment accesses a target cell through a random access mode based on competition, different SSBs need to be measured to perform initial downlink beam alignment, if the SSB period is longer, the time required by the process is also longer, and the downlink beam direction found by the SSB measurement is a wider direction and is not accurate enough; when the terminal device accesses the target cell through the random access mode that is not based on the contention, because the accuracy of the downlink beam alignment is related to the random access resource allocated by the target cell, if there is a significant deviation between the downlink beam direction corresponding to the SSB allocated by the target cell and the actual position of the terminal device, the handover may fail or the terminal device may back to the random access based on the contention.
In view of the above problems, the present application provides a mobility management method for reducing the time delay in the handover process or the process of adding a serving cell, and improving the data communication quality.
Fig. 4 is a flowchart illustrating a mobility management method according to an embodiment of the present application, where the embodiment relates to a specific process of data transmission between a first network device and a terminal device. The execution subject of this embodiment may be the first network device and the terminal device, or may be a module, for example, a chip, applied to the first network device and the terminal device, respectively. The following description will be made taking the first network device and the terminal device as the execution subjects as examples.
As shown in fig. 4, the method may include: s401, S402, S403, and S404, and the execution order of each step is not limited in the embodiment of the present application.
S401, the first network device sends first configuration information to the terminal device, and correspondingly, the terminal device receives the first configuration information from the first network device. The first configuration information includes configuration information of the candidate cell.
Optionally, the candidate cell may be selected by the first network device according to a neighboring cell measurement result of the terminal device.
Illustratively, the first network device may choose candidate cells based on cell-level measurements. For example, a Received Signal Receiving Power (RSRP) may be used as an indicator representing the received signal quality, and the first network device may use a cell whose RSRP of the cell-level reference signal is higher than a threshold value as a candidate cell; the first network device may also take, as the candidate cell, a cell whose difference between the RSRP of the cell-level reference signal and the RSRP of the cell-level reference signal of the serving cell is higher than a certain offset value. Optionally, the threshold value and the offset value may be preset by a protocol or configured by the first network device.
For example, the first network device may select a candidate cell according to the measurement result of the beam level, for example, the first network device may use a cell in which any beam direction exists and an RSRP of a reference signal corresponding to the beam direction is higher than a threshold as the candidate cell; the first network device may take a cell in which any of a plurality of beam directions exist and RSRP of a reference signal corresponding to the plurality of beam directions is higher than a threshold value as a candidate cell; the first network device may also use, as a candidate cell, a cell in which there is any one beam direction and a difference between an RSRP of a reference signal corresponding to the beam direction of the serving cell and an RSRP of a reference signal corresponding to the beam direction of the serving cell is higher than a certain offset value, where the beam direction of the serving cell may refer to a beam direction in which a signal of the terminal device is strongest in the serving cell, and may also refer to a beam direction used by the terminal device in the serving cell; the first network device may also use, as the candidate cell, a cell in which there are any multiple beam directions and a difference between an RSRP of a reference signal corresponding to each beam direction in the multiple beam directions and an RSRP of a reference signal corresponding to a serving cell beam direction is higher than a certain offset value, where the serving cell beam direction may refer to a beam direction in which a signal of the terminal device is strongest in the serving cell, and may also refer to a beam direction used by the terminal device in the serving cell. Optionally, the threshold value and the offset value may be preset by a protocol or configured by the first network device.
For example, the first network device may select the candidate cell according to the measurement result of the cell level and the measurement result of the beam level, for example, the first network device may take an intersection or a union of the candidate cell determined according to the measurement result of the cell level and the candidate cell selected according to the measurement result of the beam level.
Optionally, the first network device may also select according to information such as a geographic location, and the selection manner of the candidate cell is not limited in the embodiment of the present application.
The first configuration information includes configuration information of a part or all of the candidate cells. For example, when there are N candidate cells, the configuration information may include M groups of configuration information, where N and M are positive integers, M is smaller than or equal to N, and each group of configuration information corresponds to one candidate cell.
Each set of configuration information may include one or more of the following configuration information of the corresponding candidate cell: reference signal configuration information, measurement configuration information, beam configuration information, QCL information, control resource set CORESET configuration information, search space configuration information, timing Advance (TA) information, terminal device identification information, sequence information for PDCCH scrambling/descrambling, random access resource configuration information, PUCCH resource configuration information, radio link monitoring configuration information, security-related configuration information, MAC configuration information, RLC configuration information, PDCP configuration information, or SDAP configuration information. It should be noted that the type and specific content of the configuration information included in the set of configuration information corresponding to different candidate cells may be the same or different, and the present application is not limited thereto. For example, a set of configuration information corresponding to a certain candidate cell may include all the listed types of configuration information, and a set of configuration information corresponding to another candidate cell may include some of the listed types of configuration information, and optionally, for the portion of configuration information that is not included, the terminal device may consider that the terminal device is consistent with the serving cell.
Optionally, if the configuration information of the current serving cell needs to be modified, the configuration information of the serving cell may also be carried in the first configuration information. Optionally, in the first configuration information, the configuration information of the candidate cell may be separated from the configuration information of the serving cell, or the configuration information of the candidate cell may be added to the configuration information of the serving cell, that is, as a part of the configuration information of the serving cell, which is not limited herein.
Optionally, the first configuration information may further include an association relationship between the configuration information of the candidate cell and the corresponding candidate cell, for example, the cell identifier corresponding to each set of configuration information may be indicated by displaying an association manner, so that the terminal device can distinguish different configuration contents corresponding to different candidate cells.
Optionally, the first configuration information may further include a condition for triggering handover. The condition for triggering the handover (hereinafter referred to as the first condition) may include, but is not limited to, any one or more of the following:
A1. the cell-level signal quality of the target cell is higher than a first threshold value;
B1. the difference between the cell-level signal quality of the target cell and the cell-level signal quality of the serving cell is higher than a second threshold value;
C1. the signal quality of one or more beams of the target cell is above a third threshold;
D1. the difference between the signal quality of one or more beams of the target cell and the signal quality of the beam used by the terminal device in the serving cell is higher than a fourth threshold value;
E1. the difference between the signal quality of one or more beams of the target cell and the signal quality of the strongest beam of the serving cell is above a fifth threshold value.
Optionally, in the above A1, the cell-level signal quality of the target cell is higher than the first threshold, which may be understood as: the terminal device measures the cell-level signal quality of the target cell to be higher than a first threshold value according to the measurement result, or the terminal device measures the cell-level signal quality of the target cell to be higher than the first threshold value according to the measurement result for W1 times in a time period T1 in an accumulated mode; wherein T1 and W1 may be configured by the first configuration information.
Alternatively, in the above B1, the difference between the cell-level signal quality of the target cell and the cell-level signal quality of the serving cell is higher than the second threshold value, which can be understood as: the terminal device measures that the difference between the cell-level signal quality of the target cell and the cell-level signal quality of the serving cell is higher than a second threshold value according to a measurement result, or the terminal device measures that the difference between the cell-level signal quality of the target cell and the cell-level signal quality of the serving cell is higher than the second threshold value according to the measurement result in W2 times in a time period T2 in an accumulated mode; wherein T2 and W2 may be configured by the first configuration information.
And C1 to E1 are analogized in sequence, and the description is omitted.
Exemplarily, when the first configuration information includes a first condition, where the first condition is the above-mentioned A1, the candidate cell that satisfies A1 may be a target cell after the terminal device is handed over; when the first condition is B1, the candidate cell satisfying B1 may be used as the target cell after the terminal device is handed over, and so on.
Optionally, the first configuration information may include a second condition. The terminal device may determine whether to add the target cell as the serving cell according to the second condition. Wherein the second condition may include, but is not limited to, any one or more of:
A2. the cell-level signal quality of the target cell is higher than a threshold value a, and the cell-level signal quality of the current serving cell is higher than a threshold value b, wherein a and b can be the same or different;
B2. the signal quality of one or more beams of the target cell is higher than a threshold value c, and the signal quality of one or more beams of the current serving cell is higher than a threshold value d, wherein c and d may be the same or different.
Optionally, similarly to A1 to E1, in the above A2, the terminal device measures according to a measurement result, or the terminal device measures, according to the measurement result, the cell-level signal quality of the target cell higher than the first threshold value by accumulating K times within the time length T; wherein T and K may be configured by the first configuration information.
The terminal device determines whether to add the target cell as the serving cell according to the second condition, and specifically includes: when the second condition is met, the terminal equipment adds the target cell as a serving cell; or, when the second condition is satisfied, the terminal device does not add the target cell as the serving cell, and the terminal device uses the resource of the target cell for data transmission.
Illustratively, when the first configuration information includes a second condition, which is satisfied and is A2 above, then the terminal device may not perform the handover. Further, adding a target cell satisfying A2 as a serving cell; or, the terminal device may not add the target cell satisfying A2 as the serving cell, but the terminal device may use the resource of the target cell for data transmission.
Optionally, the first configuration information may include the first condition and/or the second condition.
Alternatively, the first condition and the second condition may be preset. In the first and second conditions, the Signal Quality may be RSRP of the Reference Signal and Reference Signal Received Quality (RSRQ) of the Reference Signal.
Optionally, the first configuration information may be any air interface signaling such as an RRC message, an MAC message, a DCI message, and the like.
Optionally, the first configuration information may be carried in one signaling or may be carried in multiple signaling, which is not limited herein. For example, the first condition, the second condition, and the configuration information of the candidate cell may be carried in different signaling.
S402, the terminal device measures the candidate cell according to the measurement configuration information of the candidate cell. Optionally, the terminal device further performs measurement on the current serving cell.
Illustratively, the terminal device measures the reference signals of the serving cell and/or the candidate cell according to the measurement configuration information of the current serving cell and/or the candidate cell in the first configuration information.
Optionally, when the first configuration information includes the first condition, the terminal device determines, according to the measurement result, the candidate cell that satisfies the first condition. For example, there are 6 candidate cells, cell 1, cell 2, cell 3, cell 4, cell 5, and cell 6, respectively. After the terminal device performs the measurement, it is determined that the cells satisfying the first condition are cell 1 and cell 2. Alternatively, if there are more than one candidate cells satisfying the first condition, the terminal device may select one of the candidate cells satisfying the first condition, or select, as the target cell, the cell with the best measurement result from the candidate cells satisfying the first condition.
Optionally, when the first configuration information includes the second condition, the terminal device determines whether the second condition is satisfied according to the measurement result. Illustratively, there are 6 candidate cells, cell 1, cell 2, cell 3, cell 4, cell 5, and cell 6, respectively. After the terminal device performs the measurement, it is determined that the measurement results of the cell 1 and the current serving cell satisfy the second condition, and the terminal device does not perform the handover for the moment. At this time, the terminal device may regard both the current serving cell and the cell 1 as serving cells, or may regard only the current serving cell as a serving cell and regard the cell 1 as another data transmission channel of the current serving cell.
S403, the terminal device sends the first indication information to the first network device, and correspondingly, the first network device receives the first indication information from the terminal device. Optionally, the first indication information may be an RRC message, a MAC message, an air interface signaling such as a PUCCH.
The first indication information indicates whether to switch to the target cell and/or whether to add the target cell as a serving cell.
Optionally, the first indication information includes a cell identity of the target cell.
Optionally, the first indication information includes a reference signal identifier in the target cell corresponding to the target beam direction.
Optionally, the first indication information includes a measurement result of the serving cell, where the measurement result is a cell-level measurement result and/or a beam-level measurement result;
optionally, the first indication information includes a measurement result of at least one cell of the candidate cells, and the measurement result is a cell level measurement result and/or a beam level measurement result.
Optionally, the first indication information includes 1 bit, where "0" and "1" respectively indicate that cell handover is performed and cell handover is not performed;
optionally, the first indication information includes 2 bits, where "00" indicates that the terminal device does not perform cell handover or communicate with the target cell, "01" indicates that the terminal device does not perform cell handover and adds the target cell as the serving cell, "10" indicates that the terminal device does not perform cell handover and does not add the target cell as the serving cell, but uses resources of the target cell for data transmission, and "11" indicates that the terminal device performs cell handover. It should be understood that the value of the above bit is only an example, and the embodiment of the present application does not limit this.
There may be different combinations of the contents that may be contained in the above-mentioned several kinds of first indication information, and several possible examples of the first indication information are given below.
Example 1: the first indication information indicates that the target cell is a cell of PCI = a. And the source network equipment can acquire the target cell selected by the terminal equipment after receiving the first indication information. And the terminal equipment implicitly indicates the terminal equipment to decide to switch to the target cell through the first indication information.
Example 2: the first indication information indicates that the target cell is a cell of PCI = a. And the source network equipment can acquire the target cell selected by the terminal equipment after receiving the first indication information. Further, the first indication information further includes 1 bit, if the value of the bit indicates that cell handover is performed, that is, the terminal device indicates the terminal device to make a decision to handover to the target cell through the first indication information, and indicates the identifier of the target cell; if the value of the 1 bit indicates that the cell switching is not executed, that is, the terminal device indicates the terminal device to decide not to switch through the first indication information display, adds the target cell as the serving cell and uses the resource of the target cell for communication, or the terminal device indicates the terminal device to decide not to switch through the first indication information display and uses the resource of the target cell for communication.
Example 3: the first indication information indicates that the target cell is a cell of PCI = a. And the source network equipment can acquire the target cell selected by the terminal equipment after receiving the first indication information. Further, the first indication information further includes 2 bits, and the source network device determines, according to a value of the 2 bits, whether the terminal device makes a decision to switch and whether the target cell is added as a serving cell.
Example 4: the first indication information indicates that the target cell is a cell of PCI = a, and the first indication information indicates that the target beam direction corresponds to a reference signal of SSB ID = B in the target cell. And the source network equipment can acquire the target cell and the target beam selected by the terminal equipment after receiving the first indication information. And the terminal equipment implicitly instructs the terminal equipment to decide to switch to the target cell through the first indication information and uses the target beam for communication.
Example 5: the first indication information indicates that the target cell is a cell of PCI = a, and the first indication information indicates that the target beam direction corresponds to a reference signal of SSB ID = B in the target cell. After receiving the first indication information, the source network device can acquire the target cell and the target beam selected by the terminal device. In addition, the first indication information also carries the information of 1 bit or 2 bits. And the source network equipment determines whether the terminal equipment executes switching and whether a target cell is added as a service cell according to the values of the two bits.
Example 6: the first indication information carries beam level measurement results of the serving cell and/or the candidate cell, and the first indication information also carries the 1 bit. When the value of the 1 bit is "0", it indicates that the cell corresponding to the strongest beam in the measurement result is switched to and the beam direction is used for communication, and when the value of the 1 bit is "1", it indicates that the cell switching is not performed, and the cell corresponding to the strongest beam in the measurement result is added as a serving cell and the beam direction is used for communication.
Example 7: the first indication information carries beam level measurement results of the serving cell and/or the candidate cell, and the first indication information also carries the 1 bit. When the value of the 1 bit is "0", it indicates that the cell corresponding to the strongest beam in the measurement result is switched to, and the beam direction is used for communication, and when the value of the 1 bit is "1", it indicates that the cell switching is not performed, and the target cell is not added as a serving cell, and the first indication message is only used for reporting the measurement result.
S404, optionally, the first network device sends a response message to the terminal device, and correspondingly, the terminal device receives the response message from the first network device.
For example, if the terminal device performs a decision to handover to the target cell before, and the first network device agrees with the decision of the terminal device, the response message may also be understood as the scheduling information. And the first network equipment schedules the terminal equipment in the target cell through the scheduling message. Optionally, the first network device may send the scheduling information to the terminal device using the target beam direction selected by the terminal device, or, if the first network device considers that the target beam direction is not available, adjust the beam direction according to the actual situation of the target cell, and send the scheduling information to the terminal device using the adjusted beam direction.
For example, if the result of the previous terminal device decision is that the target cell is added as the serving cell and the first network device agrees with the terminal device decision, the first network device may inform the terminal device through the response message that the first network device agrees with the terminal device decision. Alternatively, the terminal device may use the same RNTI as used for communication in the current serving cell, but a different physical layer signal scrambling sequence, when communicating in the target cell.
For example, if the first network device rejects the decision of the terminal device, the terminal device may be informed by: (1) The first network equipment informs the terminal equipment through a response message, and the first network equipment refuses the decision of the terminal equipment; (2) The first network device does not send a response message or scheduling information indicating that the first network device has rejected the decision of the terminal device.
By implementing the method shown in fig. 4, the terminal device may determine whether to switch to the target cell or add the target cell as the serving cell according to the measurement result of the cell level and/or the beam level without waiting for the switch command of the network device or the command of adding the serving cell, which may simplify the signaling interaction process in the process of switching or adding the serving cell, thereby reducing the delay. In addition, the terminal equipment performs the beam management process of the target cell before the switching is completed, and after the terminal equipment is switched to the target cell, data transmission can be performed in the preferred beam direction, so that high-capacity data transmission can be immediately maintained after the switching, and the communication quality is improved.
Fig. 5 is a flowchart illustrating a mobility management method according to an embodiment of the present application, where the embodiment relates to a specific process of data transmission between a first network device (referred to as a source network device in the embodiment shown in fig. 5), a target network device, and a terminal device. The execution main body of this embodiment may be the first network device (source network device), the target network device, and the terminal device, or may be a module, for example, a chip, respectively applied to the first network device (source network device), the target network device, and the terminal device. The following description takes a first network device (source network device), a target network device, and a terminal device as an execution subject.
As shown in fig. 5, the method may include: s501 to S508, wherein S507 and S508 may be replaced by S509, S510 and S511. The execution sequence of each step is not limited in the embodiment of the present application.
S501, the source network device sends a switching request message to the candidate network device, and correspondingly, the candidate network device receives the switching request message from the source network device. There may be one or more candidate network devices, and the one or more candidate network devices include the target network device. For convenience of description, in the following, the candidate network device means any one of one or more candidate network devices.
Through the handover request message, the source network device requests the candidate network device for configuration information of the candidate cell. The network device to which the candidate cell belongs is a candidate network device, that is, the candidate network device may correspond to one or more candidate cells.
S502, the candidate network device sends the configuration information of the candidate cell to the source network device, and correspondingly, the source network device receives the configuration information of the candidate cell.
Optionally, the candidate cell may be selected by the candidate network device according to the neighboring cell measurement result of the terminal device, or may be selected according to information such as a geographical location, specifically referring to the manner in which the first network device selects the candidate cell in S401, only the "first network device" needs to be replaced by the "candidate network device".
S503, the source network device sends the first configuration information to the terminal device, and correspondingly, the terminal device receives the first configuration information from the source network device. The first configuration information comprises configuration information of part or all candidate cells.
Illustratively, a source network device receives configuration information from I candidate network devices, a first configuration information of each candidate network device containing X i (1<＝i<= I) configuration information of candidate cells, i.e. the source network device receives X 1 +X 2 +…+X I The source network equipment sends the configuration information of Q candidate cells to the terminal equipment through the first configuration information, wherein I and I are positive integers, and Q is less than or equal to X 1 +X 2 +…+X I 。
For the content included in the first configuration information, reference may be made to the description in S401, and details are not repeated here.
S504, the terminal device measures the candidate cell according to the measurement configuration information of the candidate cell. For a detailed description of S504, reference may be made to S402.
S505, the terminal device sends the first indication information to the source network device, and correspondingly, the source network device receives the first indication information from the terminal device. For a detailed description of the first indication information, see S403.
S506, the source network device sends second indication information to the target network device, and correspondingly, the target network device receives the second indication information from the source network device. Wherein the second indication information comprises at least one or more of:
a cell identity of a target cell;
a reference signal identifier corresponding to a target beam direction in a target cell;
cell-level measurements and/or beam-level measurements of the target cell;
optionally, the second indication information further indicates that the terminal device decides whether to perform cell handover, for example, the second indication information includes 1 bit, where "0" and "1" respectively indicate that cell handover is performed and cell handover is not performed;
optionally, the second indication information further indicates that the terminal device decides whether to add the target cell as the serving cell. Illustratively, the second indication information includes 2 bits, where "00" indicates that the terminal device does not perform cell handover nor communicate with the target cell, "01" indicates that the terminal device does not perform cell handover and adds the target cell as the serving cell, "10" indicates that the terminal device does not perform cell handover and does not add the target cell as the serving cell but performs data transmission using resources of the target cell, and "11" indicates that the terminal device performs cell handover. It should be understood that the value of the above bit is only an example, and the embodiment of the present application does not limit this.
S507, the target network device sends a response message to the source network device, and correspondingly, the source network device receives the response message from the target network device.
Illustratively, the second indication information indicates that the terminal device decides to handover to the target cell, and the target network device may send the response message for indicating acceptance or rejection of the handover decision. If the target network equipment accepts the switching decision, the source network equipment releases the connection with the terminal equipment; if the target network device rejects the handover decision, the source network device does not release the connection of the terminal device.
Optionally, the source network device notifies the terminal device of the decision result of the target network device after receiving the response message.
S508, the target network device sends a response message to the terminal device, and correspondingly, the terminal device receives the response message from the target network device.
For example, if the terminal device performs a decision before the handover to the target cell and the target network device agrees with the decision of the terminal device, the response message may also be understood as the scheduling information. And the target network equipment schedules the terminal equipment in the target cell through the scheduling message. Alternatively, the target network device may send the scheduling information to the terminal device using the target beam direction selected by the terminal device, or, if the target network device considers that the target beam direction is not available, adjust the beam direction according to the actual situation of the target cell, and send the scheduling information to the terminal device using the adjusted beam direction.
For example, if the target cell is added as the serving cell as a result of the previous terminal device decision, and the target network device agrees with the terminal device decision, the target network device may inform the terminal device through the response message, and the target network device agrees with the terminal device decision. Alternatively, the terminal device may use the same RNTI as used for communication in the current serving cell, but a different physical layer signal scrambling sequence, when communicating in the target cell.
For example, if the target network device rejects the decision of the terminal device, the terminal device may be informed in the following manner: (1) The target network equipment informs the terminal equipment through a response message, and the target network equipment refuses the decision of the terminal equipment; (2) The target network equipment does not send a response message or scheduling information, and the decision that the target network equipment rejects the terminal equipment is represented; (3) The source network device sends the result of the response message in S507 to the terminal device.
After considering that the decision result is rejected, the terminal device may continue to perform uplink and downlink transmission in the serving cell or perform a cell reselection process using the beam direction of the current serving cell.
Alternatively, S507 and S508 may be replaced by:
s509, the target network device sends scheduling information to the terminal device, and correspondingly, the terminal device receives the scheduling information from the target network device, where the detailed description refers to S508.
S510, the terminal device sends a response message to the target network device, and correspondingly, the target network device receives the response message from the terminal device. Wherein the response message is used to indicate whether the scheduling information in S509 is successfully received.
S511, the target network device sends a response message to the source network device, and correspondingly, the source network device receives the response message from the target network device, as described in detail in S507.
Alternatively, for terminal devices with multiple antenna panel capabilities, different antenna panels may be used for communication at different stages.
In S503 and S505, the terminal device communicates with the source network device at the serving cell using a single antenna panel, wherein the beam direction is directed to the serving cell. In S508 and S509, the terminal device uses the dual-antenna panel, and the beam directions are respectively directed to the serving cell and the target cell to monitor the scheduling information from the serving cell or the target cell. After the terminal equipment completes the switching, the terminal equipment uses a single antenna panel to communicate in a target cell; or, if the terminal device does not perform handover finally, the terminal device continues to communicate in the serving cell using the single antenna panel.
By implementing the method shown in fig. 5, in a cross-site scenario (that is, the target cell and the source serving cell belong to different network devices), the terminal device may determine whether to switch to the target cell or add the target cell as the serving cell according to the measurement result of the cell level and/or the beam level, without waiting for a switching command of the network device or a command of adding the serving cell, so as to simplify a signaling interaction process in the process of switching or adding the serving cell, thereby reducing the time delay. In addition, the terminal equipment performs the beam management process of the target cell before the switching is completed, and after the terminal equipment is switched to the target cell, data transmission can be performed in the preferred beam direction, so that high-capacity data transmission can be immediately maintained after the switching, and the communication quality is improved. On the other hand, the terminal device monitors the scheduling and/or response information of the source serving cell and the target cell simultaneously in the cell switching process by starting the dual-antenna panel, and the terminal can continue to monitor the scheduling and/or response information of the source serving cell under the condition of switching failure such as refusal of cell switching request, so that the probability of cell reselection is reduced, and the reliability of the switching process is improved.
Fig. 6 is a flowchart illustrating a mobility management method according to an embodiment of the present application, where the present embodiment relates to a specific process of data transmission between a first network device (referred to as a source network device in the embodiment shown in fig. 6), a target network device, and a terminal device. The execution main body of this embodiment may be the first network device (source network device), the target network device, and the terminal device, or may be a module, for example, a chip, respectively applied to the first network device (source network device), the target network device, and the terminal device. The following description takes a first network device (source network device), a target network device, and a terminal device as an execution subject.
As shown in fig. 6, the method may include: s601 to S608, wherein the execution order of each step is not limited in the embodiment of the present application.
S601 to S604 refer to S501 to S504.
S605, the terminal device sends the third indication information to the target network device, and correspondingly, the target network device receives the third indication information from the terminal device. Wherein, the content of the third indication information may refer to the content of the second indication information in S506.
Alternatively, the terminal device may transmit the third indication information using the target beam direction.
Optionally, when the terminal device sends the third indication information to the target cell, the TA value of the target cell may need to be acquired.
The terminal device obtains the TA of the target cell, and there are several possible situations:
case 1: the TA of the target cell is 0, for example, a cell with a small coverage area. In this case, the terminal device may directly transmit the third indication information to the target network device.
And 2, the difference between the TA of the target cell and the TA of the current service cell is less than the time of a cyclic prefix, for example, the coverage distance between the source cell and the target cell is close, and the terminal equipment triggers cell switching or adds the service cell when being at the edge position of the cell. In this case, the terminal device may directly transmit the third indication information to the target network device.
And 3, the terminal equipment needs to acquire the TA value of the target cell in advance, and the TA value needs to be indicated to the terminal equipment by the current serving cell. One possible implementation manner is that, in the first configuration information, SRS resources of the candidate cell are configured, and the candidate cell performs TA estimation through an SRS sent by the terminal device, and informs the current serving cell of a TA result, and then issues the TA result to the terminal device through the serving cell.
S606, the target network device sends a response message to the terminal device, and correspondingly, the terminal device receives the response message from the target network device, which is specifically referred to as S508.
S607, the terminal device sends a response message to the target network device, and the target network device receives the response message from the terminal device. Wherein the response message is used to indicate whether the scheduling information in S606 was successfully received.
S608, the target network device sends fourth indication information to the source network device, and correspondingly, the source network device receives the fourth indication information from the target device. And the target network equipment informs the source network equipment of the condition that the terminal equipment is successfully accessed into the target cell through the fourth indication information.
Alternatively, for terminal devices with multiple antenna panel capabilities, different antenna panels are used for communication at different stages.
In S603, the terminal device communicates in a serving cell using a single antenna panel, wherein a beam direction is directed to the serving cell. In S605, the terminal device communicates in a target cell using a single antenna panel, wherein a beam direction is directed to the target cell. In S606, the terminal device uses the dual-antenna panel, and the beam directions respectively point to the serving cell and the target cell, and monitors the scheduling information from the serving cell or the target cell. After the terminal equipment completes the switching, the terminal equipment uses a single antenna panel to communicate in a target cell; or, if the terminal device does not perform handover finally, the terminal device continues to communicate in the serving cell using the single antenna panel.
By implementing the method of the embodiment shown in fig. 6, in a cross-site scenario, the terminal device may trigger the handover or the addition of the serving cell according to the measurement result of the cell level and/or the beam level, without waiting for the indication information of the handover or the addition of the serving cell on the network side, and may reduce the signaling interaction process and the time delay of the handover or the addition of the serving cell process. In a cross-site scene (that is, the target cell and the source serving cell belong to different network devices), the terminal device may determine whether to switch to the target cell or add the target cell as the serving cell according to the cell-level and/or beam-level measurement result, without waiting for a switching command of the network device or a command of adding the serving cell, and may simplify a signaling interaction process in the process of switching or adding the serving cell, thereby reducing the time delay. The terminal equipment directly sends the judged indication information to the target network equipment without the process of forwarding the indication information by the source network equipment, thereby further reducing the time delay. In addition, the terminal equipment performs the beam management process of the target cell before the switching is completed, and can perform data transmission in the optimal beam direction after the switching is performed to the target cell, so that high-capacity data transmission can be immediately maintained after the switching, and the communication quality is improved. On the other hand, the terminal device monitors the scheduling and/or response information of the source serving cell and the target cell simultaneously in the cell switching process by starting the dual-antenna panel, and the terminal can continue to monitor the scheduling and/or response information of the source serving cell under the condition of switching failure such as refusal of cell switching request, so that the probability of cell reselection is reduced, and the reliability of the switching process is improved.
It should be noted that, in the specific implementation, some steps in fig. 4, fig. 5, and fig. 6 may be selected to be implemented, and the order of the steps in the diagrams may also be adjusted to be implemented, which is not limited in this application. It should be understood that the specific implementation of some steps or the order of adjusting the steps in the figures is within the scope of the present application.
Fig. 7 to 9 are schematic structural diagrams of possible communication devices provided in the embodiments of the present application.
As shown in fig. 7, the communication device 700 includes a processing unit 710 and a transceiving unit 720.
The communication apparatus 700 is used to implement the functions of the terminal device in the method embodiment shown in fig. 4, or the communication apparatus 700 may include a module, which may be implemented in whole or in part by software, hardware, firmware, or any combination thereof, to implement any function or operation of the terminal device in the method embodiment shown in fig. 4. The communication apparatus 700 is used for implementing the functions of the first network device in the method embodiment shown in fig. 4, or the communication apparatus 700 may include a module, which may be implemented in whole or in part by software, hardware, firmware, or any combination thereof, for implementing any function or operation of the first network device in the method embodiment shown in fig. 4.
The communication apparatus 700 is used to implement the functions of the terminal device in the method embodiment shown in fig. 5, or the communication apparatus 700 may include a module, which may be implemented in whole or in part by software, hardware, firmware, or any combination thereof, to implement any function or operation of the terminal device in the method embodiment shown in fig. 5. The communication apparatus 700 is used for implementing the functions of the source network device in the method embodiment shown in fig. 5, or the communication apparatus 700 may include a module, which is implemented in whole or in part by software, hardware, firmware, or any combination thereof, and is used for implementing any function or operation of the source network device in the method embodiment shown in fig. 5.
The communication apparatus 700 is used to implement the functions of the terminal device in the method embodiment shown in fig. 6, or the communication apparatus 700 may include a module, which may be implemented in whole or in part by software, hardware, firmware, or any combination thereof, to implement any function or operation of the terminal device in the method embodiment shown in fig. 6. The communication apparatus 700 is used for implementing the functions of the source network device in the method embodiment shown in fig. 6, or the communication apparatus 700 may include a module, which is implemented in whole or in part by software, hardware, firmware, or any combination thereof, and is used for implementing any function or operation of the source network device in the method embodiment shown in fig. 6.
When the communication apparatus 700 is used to implement the function of the terminal device in the method embodiment shown in fig. 4, the transceiving unit 720 is configured to receive first configuration information from the first network device, where the first configuration information includes measurement configuration information of the candidate cell; the transceiving unit 720 is further configured to send first indication information to the first network device, where the first indication information indicates whether to handover to the target cell and/or whether to add the target cell as the serving cell. The processing unit 710 is configured to measure the candidate cell according to the measurement configuration information; the processing unit 710 is further configured to determine a target cell according to the measurement result and at least one of a first condition and a second condition, where the target cell is one of the candidate cells, and the target cell satisfies the first condition and/or the second condition.
When the communication apparatus 700 is used to implement the function of the first network device in the method embodiment shown in fig. 4, the transceiver unit 720 is configured to send configuration information to the terminal device, where the configuration information includes measurement configuration information of candidate cells, where the measurement configuration information is used for the terminal device to measure the candidate cells, a target cell is one of the candidate cells, and the target cell satisfies a first condition and/or a second condition; the transceiving unit 720 is further configured to receive first indication information from the terminal device, where the first indication information indicates whether to handover to the target cell and/or whether to add the target cell as the serving cell.
When the communication apparatus 700 is used to implement the function of the terminal device in the method embodiment shown in fig. 5, the transceiving unit 720 is configured to receive first configuration information from the source network device, where the first configuration information includes measurement configuration information of the candidate cell; the transceiving unit 720 is further configured to send first indication information to the source network device, where the first indication information indicates whether to handover to the target cell and/or whether to add the target cell as the serving cell. The processing unit 710 is configured to measure the candidate cell according to the measurement configuration information; the processing unit 710 is further configured to determine a target cell according to the measurement result and at least one of a first condition and a second condition, where the target cell is one of the candidate cells, and the target cell satisfies the first condition and/or the second condition.
When the communications apparatus 700 is configured to implement the function of the source network device in the method embodiment shown in fig. 4, the transceiving unit 720 is configured to send, to the terminal device, configuration information, where the configuration information includes measurement configuration information of candidate cells, where the measurement configuration information is used for the terminal device to measure the candidate cells, a target cell is one of the candidate cells, and the target cell satisfies a first condition and/or a second condition; the transceiving unit 720 is further configured to receive first indication information from the terminal device, where the first indication information indicates whether to handover to the target cell and/or whether to add the target cell as the serving cell.
When the communication apparatus 700 is used to implement the function of the terminal device in the method embodiment shown in fig. 6, the transceiving unit 720 is configured to receive first configuration information from the source network device, where the first configuration information includes measurement configuration information of a candidate cell; the transceiving unit 720 is further configured to send third indication information to the target network device, where the third indication information indicates whether to switch to the target cell and/or whether to add the target cell as the serving cell. The processing unit 710 is configured to measure the candidate cell according to the measurement configuration information; the processing unit 710 is further configured to determine a target cell according to the measurement result and at least one of a first condition and a second condition, where the target cell is one of the candidate cells, and the target cell satisfies the first condition and/or the second condition.
When the communication apparatus 700 is used to implement the function of the source network device in the method embodiment shown in fig. 6, the transceiver unit 720 is configured to send configuration information to the terminal device, where the configuration information includes measurement configuration information of candidate cells, where the measurement configuration information is used for the terminal device to measure the candidate cells, a target cell is one of the candidate cells, and the target cell satisfies a first condition and/or a second condition; the transceiving unit 720 is further configured to receive fourth indication information from the target network device, where the fourth indication information indicates whether the terminal device successfully accesses the target cell.
More detailed descriptions about the processing unit 710 and the transceiver unit 720 can be directly obtained by referring to the related descriptions in the method embodiments shown in fig. 4, fig. 5, or fig. 6, which are not repeated herein.
Fig. 8 is a schematic structural diagram of another possible communication device according to an embodiment of the present disclosure. As shown in fig. 8, communications device 800 includes a processor 810 and an interface circuit 820. Processor 810 and interface circuit 820 are coupled to each other. It is understood that interface circuit 820 may be a transceiver or an input-output interface. Optionally, the communication device 800 may further include a memory 830 for storing instructions to be executed by the processor 810 or for storing input data required by the processor 810 to execute the instructions or for storing data generated by the processor 810 after executing the instructions.
When the communication device 800 is used to implement the method shown in fig. 4, fig. 5 or fig. 6, the processor 810 is configured to implement the functions of the processing unit 710, and the interface circuit 820 is configured to implement the functions of the transceiving unit 720.
Fig. 9 is a schematic structural diagram of an access network device according to an embodiment of the present application, where the access network device 90 includes one or more DUs 901 and one or more CUs 902, where the DU901 may be configured to execute the function of the DU in the foregoing method embodiment, and the CU902 may be configured to execute the function of the CU in the foregoing method embodiment.
The DU901 may include at least one antenna 9011, at least one radio frequency unit 9012, at least one processor 9013, and at least one memory 9014. The DU901 is mainly used for transceiving radio frequency signals, converting radio frequency signals and baseband signals, and partially processing baseband. The CU902 may include at least one processor 9022 and at least one memory 9021.CU902 and DU901 may communicate via an F1 interface (e.g., F1-C or F1-U). The CU902 section is mainly used for baseband processing and the like. The DU901 and the CU902 may be physically disposed together or may be physically disposed separately, and in the embodiment of the present application, description is given by taking an example that the DU901 and the CU902 are physically disposed separately.
Further, optionally, the access network device 90 may include one or more radio units, one or more DUs, and one or more CUs. Wherein the DU may include at least one processor 9013 and at least one memory 9014, the radio unit may include at least one antenna 9011 and at least one radio unit 9012, and the cu may include at least one processor 9022 and at least one memory 9021.
In an example, the CU902 may be formed by one or more boards, and the multiple boards may jointly support a radio access network with a single access indication (e.g., a 5G network), or may respectively support radio access networks with different access schemes (e.g., an LTE network, a 5G network, or other networks). The memory 9021 and the processor 9022 may serve one or more boards; that is, the memory and the processor may be separately provided on each board, or a plurality of boards may share the same memory and processor. In addition, each single board can be provided with necessary circuits. The DU901 may be formed by one or more boards, and the boards may jointly support a radio access network with a single access instruction (e.g., a 5G network), or may respectively support radio access networks with different access schemes (e.g., an LTE network, a 5G network, or other networks). The memory 9014 and the processor 9013 may serve one or more boards. That is, the memory and the processor may be separately provided on each board, or a plurality of boards may share the same memory and processor. In addition, each single board can be provided with necessary circuits.
The DU shown in fig. 9 enables the implementation of the respective procedures involving the DU in the method embodiments illustrated in fig. 4, 5 or 6. The operations and/or functions of the modules in the DU shown in fig. 9 are respectively for implementing the corresponding flows in the above method embodiments. Specifically, reference may be made to the description of the above method embodiments, and the detailed description is appropriately omitted herein to avoid redundancy.
The CU shown in fig. 9 is capable of implementing the various processes involving the CU in the method embodiments illustrated in fig. 4, 5 or 6. The operations and/or functions of the respective modules in the CU shown in fig. 9 are respectively for implementing the corresponding flows in the above-described method embodiments. Specifically, reference may be made to the description of the above method embodiments, and the detailed description is appropriately omitted herein to avoid redundancy.
It is understood that the Processor in the embodiments of the present Application may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a transistor logic device, a hardware component, or any combination thereof. The general purpose processor may be a microprocessor, but may be any conventional processor.
In embodiments of the present application, the processor may be a Random Access Memory (RAM), a flash Memory, a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable Programmable PROM (EPROM), an Electrically Erasable Programmable ROM (EEPROM), a register, a hard disk, a removable hard disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. In addition, the ASIC may reside in a network device or a terminal device. Of course, the processor and the storage medium may reside as discrete components in a network device or a terminal device.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network appliance, a terminal device, or other programmable apparatus. The computer program or instructions may be stored in or transmitted over a computer-readable storage medium. The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server that integrates one or more available media. The usable medium may be a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape; or an optical medium, such as a DVD; it may also be a semiconductor medium, such as a Solid State Disk (SSD).
In the embodiments of the present application, unless otherwise specified or conflicting with respect to logic, the terms and/or descriptions in different embodiments have consistency and may be mutually cited, and technical features in different embodiments may be combined to form a new embodiment according to their inherent logic relationship.
It is to be understood that the various numerical references referred to in the embodiments of the present application are merely for convenience of description and distinction and are not intended to limit the scope of the embodiments of the present application. The sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of the processes should be determined by their functions and inherent logic.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

Claims (30)

1. A mobility management method is applied to a terminal device, and is characterized by comprising the following steps:
receiving first configuration information from a first network device, the first configuration information comprising measurement configuration information of a candidate cell;
measuring the candidate cell according to the measurement configuration information;
determining a target cell according to the measurement result and at least one of a first condition and a second condition, wherein the target cell is one of the candidate cells, and the target cell meets the first condition and/or the second condition;
and sending first indication information to the first network equipment, wherein the first indication information indicates whether to switch to the target cell and/or whether to add the target cell as a serving cell.
2. The method of claim 1, wherein the first configuration information includes the first condition, and wherein determining the target cell according to the measurement result and at least one of the first condition and the second condition specifically includes:
and determining whether to switch to the target cell according to the measurement result and the first condition.
3. The method according to claim 1 or 2, wherein the first condition comprises at least one of:
the cell-level signal quality of the target cell is higher than a first threshold value;
the difference between the cell-level signal quality of the target cell and the cell-level signal quality of a serving cell is higher than a second threshold value, and the serving cell serves the terminal device before handover;
the signal quality of one or more beams of the target cell is above a third threshold;
the difference between the signal quality of one or more beams of the target cell and the signal quality of the beam used by the terminal device in the serving cell is higher than a fourth threshold value;
the difference between the signal quality of one or more beams of the target cell and the signal quality of the strongest beam in the serving cell is above a fifth threshold value.
4. The method according to any of claims 1 to 3, wherein the first configuration information includes the second condition, the first configuration information includes the first condition, and the determining the target cell according to the measurement result and at least one of the first condition and the second condition specifically includes:
and determining whether to add the target cell as a serving cell according to the measurement result and the second condition.
5. The method according to any one of claims 1 to 4, wherein the second condition comprises at least one of:
the cell-level signal quality of the target cell is higher than a sixth threshold, and the cell-level signal quality of the serving cell is higher than the sixth threshold;
the signal quality of the one or more beams of the target cell is above a seventh threshold, and the signal quality of the one or more beams of the serving cell is above a seventh threshold.
6. The method according to any one of claims 1 to 5,
when the second condition is met, adding the target cell as a serving cell; or the like, or, alternatively,
and when the second condition is met, the target cell is not added as a service cell, and the resources of the target cell are used for data transmission.
7. The method according to any one of claims 1 to 6, wherein the first indication information further comprises at least one of:
a cell identity of the target cell;
a reference signal identifier corresponding to a target beam direction in the target cell;
a measurement result of a serving cell, wherein the serving cell serves the terminal device before handover, and the measurement result is a cell-level measurement result and/or a beam-level measurement result;
a measurement result of at least one of the candidate cells, the measurement result being a cell-level measurement result and/or a beam-level measurement result.
8. A mobility management method is applied to a terminal device, and is characterized by comprising the following steps:
receiving first configuration information from a first network device, the first configuration information comprising measurement configuration information of a candidate cell;
measuring the candidate cell according to the measurement configuration information;
determining a target cell according to the measurement result and at least one of a first condition and a second condition, wherein the target cell is one of the candidate cells, and the target cell meets the first condition and/or the second condition;
and sending third indication information to target network equipment, wherein the third indication information indicates whether to switch to the target cell and/or whether to add the target cell as a serving cell.
9. The method according to claim 8, wherein the first configuration information includes the first condition, and the determining the target cell according to the measurement result and at least one of the first condition and the second condition specifically includes:
and determining whether to switch to the target cell according to the measurement result and the first condition.
10. The method according to claim 8 or 9, wherein the first condition comprises at least one of:
the cell-level signal quality of the target cell is higher than a first threshold value;
the difference between the cell-level signal quality of the target cell and the cell-level signal quality of a serving cell is higher than a second threshold value, and the serving cell serves the terminal device before handover;
the signal quality of one or more beams of the target cell is above a third threshold;
the difference between the signal quality of one or more beams of the target cell and the signal quality of the beam used by the terminal device in the serving cell is higher than a fourth threshold value;
the difference between the signal quality of one or more beams of the target cell and the signal quality of the strongest beam in the serving cell is above a fifth threshold value.
11. The method according to any of claims 8 to 10, wherein the first configuration information includes the second condition, the first configuration information includes the first condition, and the determining the target cell according to the measurement result and at least one of the first condition and the second condition specifically includes:
and determining whether to add the target cell as a serving cell according to the measurement result and the second condition.
12. The method according to any one of claims 8 to 11, wherein the second condition comprises at least one of:
the cell-level signal quality of the target cell is higher than a sixth threshold, and the cell-level signal quality of the serving cell is higher than the sixth threshold;
the signal quality of the one or more beams of the target cell is above a seventh threshold, and the signal quality of the one or more beams of the serving cell is above a seventh threshold.
13. The method according to any one of claims 8 to 12,
when the second condition is met, adding the target cell as a serving cell; or the like, or, alternatively,
and when the second condition is met, the target cell is not added as a service cell, and the resources of the target cell are used for data transmission.
14. The method according to any one of claims 8 to 13, wherein the third indication information further comprises at least one of:
a cell identity of the target cell;
a reference signal identifier corresponding to a target beam direction in the target cell;
cell-level measurements and/or beam-level measurements of the target cell.
15. A mobility management method is applied to a first network device, and comprises the following steps:
sending configuration information to a terminal device, where the configuration information includes measurement configuration information of candidate cells, the measurement configuration information is used for the terminal device to measure the candidate cells, a target cell is one of the candidate cells, and the target cell meets a first condition and/or a second condition;
and receiving first indication information from the terminal equipment, wherein the first indication information indicates whether to switch to the target cell and/or whether to add the target cell as a serving cell.
16. The method of claim 15, wherein the first configuration information comprises the first condition, and wherein the first condition is used for determining whether to handover to the target cell.
17. The method of claim 15 or 16, wherein the first condition comprises at least one of:
the cell-level signal quality of the target cell is higher than a first threshold value;
the difference between the cell-level signal quality of the target cell and the cell-level signal quality of a serving cell is higher than a second threshold value, and the serving cell serves the terminal device before handover;
the signal quality of one or more beams of the target cell is above a third threshold;
the difference between the signal quality of one or more beams of the target cell and the signal quality of the beam used by the terminal device in the serving cell is higher than a fourth threshold value;
the difference between the signal quality of one or more beams of the target cell and the signal quality of the strongest beam in the serving cell is above a fifth threshold value.
18. The method according to any of claims 15 to 17, wherein the configuration information comprises a second condition for determining whether to add the target cell as a serving cell.
19. The method according to any one of claims 15 to 18, wherein the second condition comprises at least one of:
the cell-level signal quality of the target cell is higher than a sixth threshold, and the cell-level signal quality of the serving cell is higher than the sixth threshold;
the signal quality of the one or more beams of the target cell is above a seventh threshold, and the signal quality of the one or more beams of the serving cell is above a seventh threshold.
20. The method according to any one of claims 15 to 19, wherein the first indication information further comprises at least one of:
a cell identity of the target cell;
a reference signal identifier corresponding to a target beam direction in the target cell;
a measurement result of a serving cell, the serving cell serving the terminal device before handover, the measurement result being a cell level measurement result and/or a beam level measurement result;
a measurement result of at least one of the candidate cells, the measurement result being a cell-level measurement result and/or a beam-level measurement result.
21. The method according to any of claims 15 to 20, wherein the first network device is a source network device.
22. The method of claim 21, further comprising:
sending a handover request message to a candidate network device, where the handover request message is used to request configuration information of the candidate cell, and the candidate cell belongs to the candidate network device;
receiving configuration information of the candidate cell from the candidate network device.
23. The method according to claim 21 or 22, further comprising:
sending second indication information to a target network device, wherein the target cell belongs to the target network device, and the second indication information comprises at least one of the following items:
the terminal equipment decides whether to switch;
a cell identity of the target cell;
a reference signal identifier corresponding to a target beam direction in the target cell;
cell-level measurements and/or beam-level measurements of the target cell.
24. The method according to claim 23, wherein the information that the terminal device decides whether to perform handover specifically includes:
not executing the switching; or the like, or a combination thereof,
not executing switching, and adding the target cell as a service cell; or the like, or, alternatively,
and performing no switching, and performing data transmission by using the resources of the target cell.
25. The method according to claim 23 or 24, further comprising:
receiving fourth indication information from a target network device, wherein the fourth indication information indicates whether to approve the switching decision of the terminal device.
26. A communications apparatus, comprising means for performing the method of any of claims 1-25.
27. A communications apparatus comprising a processor and a memory, the processor and the memory coupled, the processor configured to control the apparatus to implement the method of any of claims 1 to 25.
28. A communications device comprising a processor and interface circuitry for receiving and transmitting signals from or sending signals to other communications devices than the communications device, the processor being operable by logic circuitry or executing code instructions to implement the method of any of claims 1 to 25.
29. A computer-readable storage medium, in which a computer program or instructions is stored which, when executed by a communication apparatus, implements the method of any one of claims 1 to 25.
30. A computer program product, characterized in that it comprises instructions which, when executed by a computer, implement the method according to any one of claims 1 to 25.
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