CN108347789B - Random access method and device - Google Patents
Random access method and device Download PDFInfo
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- CN108347789B CN108347789B CN201710060118.7A CN201710060118A CN108347789B CN 108347789 B CN108347789 B CN 108347789B CN 201710060118 A CN201710060118 A CN 201710060118A CN 108347789 B CN108347789 B CN 108347789B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
Abstract
The application discloses a random access method and a random access device.A network device determines that a terminal accesses the network device in a random access mode, wherein the terminal is a terminal which is converted from a normal mode to an enhanced mode; and the network equipment sends enhanced mode information to the terminal, wherein the enhanced mode information is used for indicating the terminal to access the network equipment according to the enhanced mode information in the random access process.
Description
Technical Field
The present application relates to the field of mobile communications technologies, and in particular, to a random access method and apparatus.
Background
At present, in order to improve the service experience of the terminal, it is proposed to dynamically configure the terminal to switch from the normal mode to the enhanced mode according to an air interface condition or service characteristics and the like in a Radio Resource Control (RRC) connected state process. For example, when voice or video service is performed, due to coverage degradation, the base station configures the terminal to be converted from a normal mode (normal mode) to a Physical Uplink Shared Channel (PUSCH) enhanced mode (enhanced mode), so that the terminal obtains better coverage in the enhanced mode. For another example, the base station configures, according to the capability of the terminal and the service type of the terminal, that the terminal is converted from a traditional (legacy) Transmission Time Interval (TTI) mode to a shortened TTI mode, thereby obtaining a shorter service delay. For another example, the base station may configure the terminal to convert from one subcarrier spacing to another subcarrier spacing, thereby obtaining different rates and service experiences.
After the terminal enters the enhanced mode, some abnormal situations may occur, such as Radio Link Failure (RLF) or uplink out-of-step. After the abnormal conditions occur, the terminal may initiate Random Access (Random Access), so as to establish a connection with the base station through a Random Access procedure.
When the terminal has the enhanced mode, no complete solution exists how to realize the connection between the terminal and the base station through a random access mode.
Disclosure of Invention
The application provides a random access method and a random access device, which are used for solving the problem of how to establish connection between a terminal and a base station in a random access mode when the terminal has an enhanced mode.
In a first aspect, an embodiment of the present application provides a random access method, where the method includes:
the network equipment determines that a terminal accesses the network equipment in a random access mode, wherein the terminal is a terminal which is converted from a normal mode to an enhanced mode;
and the network equipment sends enhanced mode information to the terminal, wherein the enhanced mode information is used for indicating the terminal to access the network equipment according to the enhanced mode information in the random access process.
According to the method provided by the embodiment of the application, after the network equipment determines that the terminal needs to be accessed to the network equipment in a random access mode, the network equipment sends the enhanced mode message to the terminal, so that the terminal is indicated to be accessed to the network equipment according to the enhanced mode message in the random access process, the terminal can establish connection with the network equipment in the enhanced mode, the terminal can keep the enhanced mode all the time, and the efficiency of the system is improved.
Optionally, the enhanced mode information includes one or more of the following:
the number of repetitions of message 3;
length of transmission time interval TTI;
a subcarrier spacing;
physical random access channel PRACH repetition times;
time-frequency resource indication information of PRACH.
Optionally, the sending, by the network device, the enhanced mode information to the terminal includes:
the network equipment sends the enhanced mode information to the terminal through a Random Access Response (RAR) message; or
And the network equipment commands a PDCCH order to send the enhanced mode information to the terminal through a physical downlink control channel.
Optionally, the enhanced mode information includes a repetition number of the message 3, where the repetition number of the message 3 is located in an uplink grant of the RAR message; or
The enhanced mode information includes a length of a TTI that is in an uplink grant of the RAR message; or
The enhanced mode information comprises a subcarrier spacing, which is located in an uplink grant of the RAR message; or
The enhanced mode information comprises PRACH repetition times and time frequency resource indication information of the PRACH, and the PRACH repetition times and the time frequency resource indication information of the PRACH are located in the PDCCH order.
Optionally, before the network device determines that the terminal accesses the network device through the random access manner, the method further includes:
and the network equipment determines that the terminal has uplink desynchronizing.
Optionally, the random access mode is non-contention random access.
In a second aspect, an embodiment of the present application provides a random access method, where the method includes:
a terminal receives enhanced mode information sent by network equipment, wherein the enhanced mode information is used for indicating the terminal to access the network equipment according to the enhanced mode information in a random access process, and the terminal is a terminal which is converted from a normal mode to an enhanced mode;
and the terminal accesses the network equipment in a random access mode according to the enhanced mode information.
According to the method provided by the embodiment of the application, after receiving the enhanced mode information sent by the network equipment, the terminal accesses the network equipment according to the enhanced mode information in the random access process, so that the connection can be established between the enhanced mode and the network equipment, the terminal is enabled to keep the enhanced mode all the time, and the efficiency of the system is improved.
Optionally, the enhanced mode information includes one or more of the following:
the number of repetitions of message 3;
length of transmission time interval TTI;
a subcarrier spacing;
physical random access channel PRACH repetition times;
time-frequency resource indication information of PRACH.
Optionally, the receiving, by the terminal, the enhanced mode information sent by the network device includes:
the terminal receives the enhanced mode information through a Random Access Response (RAR) message sent by the network equipment; or
And the network equipment of the terminal receives the enhanced mode information through a Physical Downlink Control Channel (PDCCH) order sent by the network equipment.
Optionally, the enhanced mode information includes a repetition number of the message 3, where the repetition number of the message 3 is located in an uplink grant of the RAR message; or
The enhanced mode information includes a length of a TTI that is in an uplink grant of the RAR message; or
The enhanced mode information comprises a subcarrier spacing, which is located in an uplink grant of the RAR message; or
The enhanced mode information comprises PRACH repetition times and time frequency resource indication information of the PRACH, and the PRACH repetition times and the time frequency resource indication information of the PRACH are located in the PDCCH order.
In a third aspect, an embodiment of the present application provides a random access method, where the method includes:
a terminal determines to access network equipment in a competitive random access mode, wherein the terminal is a terminal which is converted from a normal mode to an enhanced mode;
and the terminal returns to the normal mode and accesses the network equipment in the competitive random access mode.
According to the method provided by the embodiment of the application, when the terminal is in the enhanced mode, after the network equipment is determined to be accessed in the competitive random access mode, the terminal returns to the normal mode and is accessed in the network equipment in the competitive random access mode, so that the random access failure caused by the random access of the terminal in the enhanced mode due to the fact that the network equipment does not identify the terminal is avoided, and the success rate of the random access of the terminal is improved.
Optionally, the returning the terminal to the normal mode includes:
the terminal returns to a normal mode before initiating random access; or
And after receiving a Random Access Response (RAR) message sent by the network equipment, the terminal returns to the normal mode.
In a fourth aspect, an embodiment of the present application provides a random access apparatus, including:
the processing unit is used for determining that a terminal accesses the network equipment in a random access mode, wherein the terminal is a terminal which is converted from a normal mode to an enhanced mode;
a transceiving unit, configured to send enhanced mode information to the terminal, where the enhanced mode information is used to instruct the terminal to access the network device according to the enhanced mode information in a random access process.
Optionally, the enhanced mode information includes one or more of the following:
the number of repetitions of message 3;
length of transmission time interval TTI;
a subcarrier spacing;
physical random access channel PRACH repetition times;
time-frequency resource indication information of PRACH.
Optionally, the transceiver unit is specifically configured to:
sending the enhanced mode information to the terminal through a Random Access Response (RAR) message; or
And commanding the PDCCH order to send the enhanced mode information to the terminal through a physical downlink control channel.
Optionally, the enhanced mode information includes a repetition number of the message 3, where the repetition number of the message 3 is located in an uplink grant of the RAR message; or
The enhanced mode information includes a length of a TTI that is in an uplink grant of the RAR message; or
The enhanced mode information comprises a subcarrier spacing, which is located in an uplink grant of the RAR message; or
The enhanced mode information comprises PRACH repetition times and time frequency resource indication information of the PRACH, and the PRACH repetition times and the time frequency resource indication information of the PRACH are located in the PDCCH order.
Optionally, the processing unit is further configured to:
and determining that the terminal has uplink desynchronization.
Optionally, the random access mode is non-contention random access.
In a fifth aspect, an embodiment of the present application provides a random access apparatus, including:
a transceiver unit, configured to receive enhanced mode information sent by a network device, where the enhanced mode information is used to instruct a terminal to access the network device according to the enhanced mode information in a random access process, where the terminal is a terminal that is switched from a normal mode to an enhanced mode;
and the processing unit is used for accessing the network equipment in a random access mode according to the enhanced mode information.
Optionally, the enhanced mode information includes one or more of the following:
the number of repetitions of message 3;
length of transmission time interval TTI;
a subcarrier spacing;
physical random access channel PRACH repetition times;
time-frequency resource indication information of PRACH.
Optionally, the transceiver unit is specifically configured to:
receiving the enhanced mode information through a Random Access Response (RAR) message sent by the network equipment; or
And the network equipment receives the enhanced mode information through a Physical Downlink Control Channel (PDCCH) order sent by the network equipment.
Optionally, the enhanced mode information includes a repetition number of the message 3, where the repetition number of the message 3 is located in an uplink grant of the RAR message; or
The enhanced mode information includes a length of a TTI that is in an uplink grant of the RAR message; or
The enhanced mode information comprises a subcarrier spacing, which is located in an uplink grant of the RAR message; or
The enhanced mode information comprises PRACH repetition times and time frequency resource indication information of the PRACH, and the PRACH repetition times and the time frequency resource indication information of the PRACH are located in the PDCCH order.
In a sixth aspect, an embodiment of the present application provides a random access apparatus, including:
the processing unit is used for determining that the network equipment is accessed in a competitive random access mode, wherein the terminal is a terminal which is converted from a normal mode to an enhanced mode;
and the transceiver unit is used for returning to the normal mode and accessing the network equipment in the competitive random access mode.
Optionally, the transceiver unit is specifically configured to:
returning to a normal mode before initiating random access; or
And returning to the normal mode after receiving a Random Access Response (RAR) message sent by the network equipment.
In a seventh aspect, an embodiment of the present application provides a random access apparatus, including:
the processor is used for determining that a terminal accesses the network equipment in a random access mode, wherein the terminal is a terminal which is converted from a normal mode to an enhanced mode;
a transceiver, configured to send enhanced mode information to the terminal, where the enhanced mode information is used to instruct the terminal to access the network device according to the enhanced mode information in a random access process.
Optionally, the enhanced mode information includes one or more of the following:
the number of repetitions of message 3;
length of transmission time interval TTI;
a subcarrier spacing;
physical random access channel PRACH repetition times;
time-frequency resource indication information of PRACH.
Optionally, the transceiver is specifically configured to:
sending the enhanced mode information to the terminal through a Random Access Response (RAR) message; or
And commanding the PDCCH order to send the enhanced mode information to the terminal through a physical downlink control channel.
Optionally, the enhanced mode information includes a repetition number of the message 3, where the repetition number of the message 3 is located in an uplink grant of the RAR message; or
The enhanced mode information includes a length of a TTI that is in an uplink grant of the RAR message; or
The enhanced mode information comprises a subcarrier spacing, which is located in an uplink grant of the RAR message; or
The enhanced mode information comprises PRACH repetition times and time frequency resource indication information of the PRACH, and the PRACH repetition times and the time frequency resource indication information of the PRACH are located in the PDCCH order.
Optionally, the processor is further configured to:
and determining that the terminal has uplink desynchronization.
Optionally, the random access mode is non-contention random access.
In an eighth aspect, an embodiment of the present application provides a random access apparatus, including:
the transceiver is used for receiving enhanced mode information sent by network equipment, wherein the enhanced mode information is used for indicating the terminal to access the network equipment according to the enhanced mode information in the random access process, and the terminal is a terminal converted from a normal mode to an enhanced mode;
and the processor is used for accessing the network equipment in a random access mode according to the enhanced mode information.
Optionally, the enhanced mode information includes one or more of the following:
the number of repetitions of message 3;
length of transmission time interval TTI;
a subcarrier spacing;
physical random access channel PRACH repetition times;
time-frequency resource indication information of PRACH.
Optionally, the transceiver is specifically configured to:
receiving the enhanced mode information through a Random Access Response (RAR) message sent by the network equipment; or
And the network equipment receives the enhanced mode information through a Physical Downlink Control Channel (PDCCH) order sent by the network equipment.
Optionally, the enhanced mode information includes a repetition number of the message 3, where the repetition number of the message 3 is located in an uplink grant of the RAR message; or
The enhanced mode information includes a length of a TTI that is in an uplink grant of the RAR message; or
The enhanced mode information comprises a subcarrier spacing, which is located in an uplink grant of the RAR message; or
The enhanced mode information comprises PRACH repetition times and time frequency resource indication information of the PRACH, and the PRACH repetition times and the time frequency resource indication information of the PRACH are located in the PDCCH order.
In a ninth aspect, an embodiment of the present application provides a random access apparatus, including:
the processor is used for determining that the network equipment is accessed in a competitive random access mode, wherein the terminal is a terminal which is converted from a normal mode to an enhanced mode;
and the transceiver is used for returning to the normal mode and accessing the network equipment in the competitive random access mode.
Optionally, the transceiver is specifically configured to:
returning to a normal mode before initiating random access; or
And returning to the normal mode after receiving a Random Access Response (RAR) message sent by the network equipment.
In a tenth aspect, a computer-readable storage medium is provided, having stored therein instructions, which, when run on a computer, cause the computer to perform the method of the above aspects.
In an eleventh aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the above aspects.
Drawings
Fig. 1 is a diagram illustrating a contention random access procedure in the prior art;
fig. 2 is a diagram illustrating a non-contention random access procedure in the prior art;
fig. 3 is a schematic flow chart of a random access method according to an embodiment of the present application;
fig. 4 is a schematic flowchart of a random access method according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a random access apparatus according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a network device according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a random access apparatus according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a terminal according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a random access apparatus according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of a terminal according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail below with reference to the accompanying drawings.
The embodiment of the application can be applied to various mobile communication systems, such as: new Radio (NR) systems, Global System of Mobile communication (GSM) systems, Code Division Multiple Access (CDMA) systems, Wideband Code Division Multiple Access (WCDMA) systems, General Packet Radio Service (GPRS), Long Term Evolution (LTE) systems, Advanced Long Term Evolution (LTE-a) systems, Universal Mobile Telecommunications System (UMTS), evolved Long Term Evolution (LTE) systems, and other Mobile communication systems such as 5G.
Hereinafter, some terms in the present application are explained to facilitate understanding by those skilled in the art.
1) A terminal, also called a User Equipment (UE), is a device providing voice and/or data connectivity to a User, for example, a handheld device with a wireless connection function, a vehicle-mounted device, and so on. Common terminals include, for example: the mobile phone includes a mobile phone, a tablet computer, a notebook computer, a palm computer, a Mobile Internet Device (MID), and a wearable device such as a smart watch, a smart bracelet, a pedometer, and the like.
2) The network device may be a common base station (e.g., a Node B or an eNB), may be a New Radio controller (NR controller), may be a gNode B (gNB) in a 5G system, may be a Centralized network element (Centralized Unit), may be a New Radio base station, may be a Radio remote module, may be a micro base station, may be a relay (relay), may be a Distributed network element (Distributed Unit), may be a Reception Point (Transmission Reception Point, TRP) or a Transmission Point (Transmission Point, TP), or any other wireless access device, but the embodiment of the present invention is not limited thereto.
3) Message 3(Msg3), message sent by the terminal to the base station in step three of the contention-based random access procedure. The Msg3 may be an L2 message or an L3 message, the L2 message may be a Media Access Control (MAC) Control cell, and the L3 message may be an RRC message (RRC connection setup request, RRC connection re-establishment, or the like), which is the first uplink data sent by the terminal on the uplink traffic channel.
Of course, the message 3 may also refer to the first uplink data transmitted by the terminal to the base station in the non-contention random access.
4) And the enhancement mode is a mode for enhancing the signal coverage, transmission delay, power consumption, transmission rate and the like of the terminal relative to the normal mode so as to fulfill the aims of meeting the service requirement, improving the service experience, improving the system capacity and the like.
The embodiment of the application can be applied to competitive random access and non-competitive random access. Fig. 1 is a schematic diagram illustrating a contention random access procedure in the prior art.
S101: the terminal sends a Random Access preamble (preamble) to the network device, where the preamble is sent on a Physical Random Access Channel (PRACH) PRACH Channel. This message may also be referred to as message 1(Msg 1).
S102: the network device replies a Random Access Response (RAR) message to the terminal.
This message may also be referred to as message 2(Msg 2).
S103: the terminal sends Msg3 to the network device, Msg3 may be a L2 message or a L3 message.
The L2 message may be a MAC control information element, and the L3 message may be an RRC connection setup request message or an RRC connection re-setup message.
S104: the network device feeds back a contention resolution message, which may be an RRC message (e.g., RRC connection setup, etc.), to the terminal, which may also be referred to as message 4(Msg 4).
The above process is contention random access, and in the process, the network device cannot identify the terminal according to the preamble.
Fig. 2 is a schematic diagram of a non-contention random access procedure in the prior art.
S201: and the network equipment allocates preamble for the terminal.
S202: and the terminal sends a random access preamble to the network equipment, wherein the preamble is sent on the PRACH channel.
S203: and the network equipment replies an RAR message to the terminal.
S204: the terminal sends Msg3 to the network device, Msg3 may be a L2 message or a L3 message.
In the above flow, for non-contention random access, a random access preamble initiated by a terminal is allocated by a network device station, and the network device can identify the terminal after receiving a preamble sent by the terminal, and can schedule the terminal by using the stored configuration of the terminal.
With reference to fig. 3, a flowchart of a random access method according to an embodiment of the present application is shown. The method comprises the following steps:
s301: the network equipment determines that a terminal accesses the network equipment in a random access mode, wherein the terminal is a terminal which is converted from a normal mode to an enhanced mode.
S302: and the network equipment sends enhanced mode information to the terminal, wherein the enhanced mode information is used for indicating the terminal to access the network equipment according to the enhanced mode information in the random access process.
S303: and the terminal receives the enhanced mode information sent by the network equipment.
S304: and the terminal accesses the network equipment in a random access mode according to the enhanced mode information.
Before S301, the terminal is switched from the normal mode to the enhanced mode. For example, when the terminal performs a voice or video service, the network device configures the terminal to switch from the normal mode to the enhanced mode due to poor coverage, so that the terminal obtains better coverage in the enhanced mode. For another example, the network device configures the terminal to be converted from the conventional TTI mode to the short TTI mode according to the capability of the terminal and the service type of the terminal, so as to obtain a shorter service delay. For another example, the network device may also configure the terminal to switch from one subcarrier spacing to another subcarrier spacing, thereby obtaining different rates and service experiences.
Of course, the above is only an example, and the terminal may also switch from the normal mode to the enhanced mode in other cases, which is not illustrated herein one by one.
In S301, after determining that the terminal has uplink out-of-step, the network device may determine that the terminal needs to re-access the network device in a random access manner. At this time, the network device may instruct the terminal to initiate non-contention random access through a Physical Downlink Control Channel (PDCCH) command (order), so that the terminal performs uplink synchronization again.
The network equipment indicates the terminal to initiate non-competitive random access, and for the non-competitive random access, the network equipment can identify the terminal, so that the terminal can continue to use the enhanced mode in the random access process.
In order to enable the terminal to access the network device in the enhanced mode in a non-contention random access manner, in S302, the network device needs to send enhanced mode information to the terminal.
In an embodiment of the present application, the enhanced mode information may include one or more of the following:
the repetition times of the message 3 are used for indicating the maximum times of repeatedly sending the message 3 by the terminal in the random access process;
the length of the TTI, which is used for indicating the length of the TTI used when the terminal sends the message 3 in the random access process;
a subcarrier interval, which is used for indicating the subcarrier interval used when the terminal sends the message 3 in the random access process;
the PRACH repetition times;
and indicating the time-frequency resource occupied by the PRACH by the time-frequency resource indicating information of the PRACH.
The network device may send the enhanced mode information to the terminal in a variety of ways.
In a first possible implementation manner, the network device may send the enhanced mode information to the terminal through a PDCCH order.
For example, the enhanced mode information includes PRACH repetition times and time-frequency resource indication information of the PRACH, and the network device may send the PRACH repetition times and the time-frequency resource indication information of the PRACH through the PDCCH order. Specifically, the Network device may add m bits to a Downlink Control Information (DCI) format (format)1A scrambled by a Cell Radio Network Temporary Identifier (C-RNTI) in the PDCCH for transmitting PRACH repetition times; meanwhile, the network equipment can increase n bits in DCI format 1A scrambled by C-RNTI in PDCCH for transmitting time frequency resource indication information of PRACH, wherein m and n are positive integers more than 0.
In a second possible implementation manner, the network device may send the enhanced mode information to the terminal through a RAR message.
Specifically, the network device may send the enhanced mode information to the terminal through an Uplink (UL) grant (grant) in the RAR message.
The format of the existing UL grant can be as shown in table 1:
TABLE 1
For example, the enhanced mode information includes the number of repetitions of the message 3, and the network device may redefine a "transmission power control command for physical uplink shared channel" field in the UL grant of the RAR message, and change the redefined "transmission power control command for physical uplink shared channel" field into a "number of repetitions of the message 3" field to indicate the number of repetitions of the message 3. At this time, the format of the UL grant may be as shown in table 2:
TABLE 2
In conjunction with the above description, when using the coverage enhanced voice technology, if the terminal is abnormal and uplink is out of step, the network device may notify the terminal of the number of repetitions of the message 3 in the above manner, so as to enable the terminal to use the number of repetitions to transmit the message 3 when transmitting the message 3.
In this embodiment of the present application, the format of the existing UL grant may also be modified, and a field of the number of repetitions of message 3 is added to the format of the existing UL grant, so that the number of repetitions of message 3 is indicated to the terminal through the field of the number of repetitions of message 3. For example, the format of the existing UL grant can also be shown in table 3:
TABLE 3
For transmitting the enhanced mode information, in combination with the format of the UL grant described in table 1, fields such as the narrowband index value of the message 3 on the PUSCH, resource allocation of the message 3 on the PUSCH, transmission power control, the narrowband index value of the machine type communication physical downlink control channel of the message 3 or the message 4, and the complementary 0 bit may be deleted, and the fixed-size resource block assignment field and the repetition number field of the message 3 are added, so as to obtain the format of the UL grant shown in table 4:
TABLE 4
For another example, the enhanced mode information includes the length of TTI or subcarrier spacing of message 3, the network device uses k bits in the "fixed size resource block assignment" in the UL grant to indicate the length of TTI or subcarrier spacing, k being an integer greater than 0 and less than 10. At this time, the format of the UL grant may be as shown in table 5:
TABLE 5
With reference to the above description, in a scenario of a short TTI mode, the length of the TTI may be transmitted by using the above method; in the mode scenario of subcarrier spacing change, the subcarrier spacing may be transmitted using the above method.
Of course, the above is only an example, and the enhancement mode information may also be sent in other manners, which is not described herein again.
In S303, the terminal receives the enhanced mode information sent by the network device through the PDCCH order or the RAR message.
The specific content of the enhanced mode information received by the terminal may refer to the descriptions in S301 to S302, and is not described herein again. Correspondingly, the position of the enhanced mode information in the PDCCH order or RAR message may also refer to the descriptions in S301 to S302, which are not described herein again.
Finally, in S304, the terminal accesses the network device according to the enhanced mode information in the random access process. For example, the enhanced mode information includes the number of repetitions of the message 3, the length of the TTI, and the subcarrier spacing, the maximum number of times that the terminal repeatedly transmits the message 3 in the random access process is the number of repetitions of the message 3 included in the enhanced mode information, the length of the TTI used by the terminal when transmitting the message 3 in the random access process is the length of the TTI included in the enhanced mode information, and the subcarrier spacing used by the terminal when transmitting the message 3 in the random access process is the subcarrier spacing included in the enhanced mode information.
With reference to fig. 4, a flowchart of a random access method provided in an embodiment of the present application is shown in combination with the foregoing description. The method comprises the following steps:
s401: a terminal determines to access network equipment in a competitive random access mode, wherein the terminal is a terminal which is converted from a normal mode to an enhanced mode;
s402: and the terminal returns to the normal mode and accesses the network equipment in the competitive random access mode.
Before S401, if the terminal has RLF, the terminal will initiate the competitive random access; or, if the terminal is out of synchronization in the uplink, the network device may instruct the terminal to perform uplink synchronization again through the contention random access through the PDCCH order. Based on the competitive random access, the network device can not identify the terminal identification in the random access process stage.
In S401, if the terminal determines that RLF occurs, the terminal determines that the network equipment needs to be accessed in a competitive random access mode; or, if the terminal receives the indication sent by the network device through the PDCCH order and indicates the terminal to perform uplink synchronization again through the competitive random access, the terminal may also determine that the network device needs to be accessed through the competitive random access method
In S402, the terminal may return to the normal mode before initiating random access; or the terminal returns to the normal mode after receiving the RAR message sent by the network equipment.
It should be noted that, in the embodiment of the present application, the network device adopts a non-enhanced mode for contention random access.
Based on the same technical concept, the embodiment of the present application further provides a random access apparatus, which can execute the above method embodiments.
Fig. 5 is a schematic structural diagram of a random access apparatus according to an embodiment of the present application.
Referring to fig. 5, the apparatus 500 includes:
a processing unit 501, configured to determine that a terminal accesses the network device in a random access manner, where the terminal is a terminal that is switched from a normal mode to an enhanced mode;
a transceiving unit 502, configured to send enhanced mode information to the terminal, where the enhanced mode information is used to instruct the terminal to access the network device according to the enhanced mode information in a random access process.
Optionally, the enhanced mode information includes one or more of the following:
the number of repetitions of message 3;
length of transmission time interval TTI;
a subcarrier spacing;
physical random access channel PRACH repetition times;
time-frequency resource indication information of PRACH.
Optionally, the transceiver unit 502 is specifically configured to:
sending the enhanced mode information to the terminal through a Random Access Response (RAR) message; or
And commanding the PDCCH order to send the enhanced mode information to the terminal through a physical downlink control channel.
Optionally, the enhanced mode information includes a repetition number of the message 3, where the repetition number of the message 3 is located in an uplink grant of the RAR message; or
The enhanced mode information includes a length of a TTI that is in an uplink grant of the RAR message; or
The enhanced mode information comprises a subcarrier spacing, which is located in an uplink grant of the RAR message; or
The enhanced mode information comprises PRACH repetition times and time frequency resource indication information of the PRACH, and the PRACH repetition times and the time frequency resource indication information of the PRACH are located in the PDCCH order.
Optionally, the processing unit 501 is further configured to:
and determining that the terminal has uplink desynchronization.
Optionally, the random access mode is non-contention random access.
It should be understood that the above division of the units is only a division of logical functions, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. In this embodiment, the transceiver unit 502 may be implemented by a transceiver, and the processing unit 501 may be implemented by a processor. As shown in fig. 6, the network device 600 may include a processor 601, a transceiver 602, and a memory 603. The memory 603 may be used to store a program/code preinstalled at the time of factory shipment of the network device 600, or may store a code or the like used when the processor 601 executes.
Based on the same technical concept, the embodiment of the present application further provides a random access apparatus, which can execute the above method embodiments.
Fig. 7 is a schematic structural diagram of a random access apparatus according to an embodiment of the present application.
Referring to fig. 7, the apparatus 700 includes:
a transceiver unit 701, configured to receive enhanced mode information sent by a network device, where the enhanced mode information is used to instruct a terminal to access the network device according to the enhanced mode information in a random access process, where the terminal is a terminal that is switched from a normal mode to an enhanced mode;
a processing unit 702, configured to access the network device in a random access manner according to the enhanced mode information.
Optionally, the enhanced mode information includes one or more of the following:
the number of repetitions of message 3;
length of transmission time interval TTI;
a subcarrier spacing;
physical random access channel PRACH repetition times;
time-frequency resource indication information of PRACH.
Optionally, the transceiver 701 is specifically configured to:
receiving the enhanced mode information through a Random Access Response (RAR) message sent by the network equipment; or
And the network equipment receives the enhanced mode information through a Physical Downlink Control Channel (PDCCH) order sent by the network equipment.
Optionally, the enhanced mode information includes a repetition number of the message 3, where the repetition number of the message 3 is located in an uplink grant of the RAR message; or
The enhanced mode information includes a length of a TTI that is in an uplink grant of the RAR message; or
The enhanced mode information comprises a subcarrier spacing, which is located in an uplink grant of the RAR message; or
The enhanced mode information comprises PRACH repetition times and time frequency resource indication information of the PRACH, and the PRACH repetition times and the time frequency resource indication information of the PRACH are located in the PDCCH order.
It should be understood that the above division of the units is only a division of logical functions, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. In this embodiment, the transceiver 701 may be implemented by a transceiver, and the processing unit 702 may be implemented by a processor. As shown in fig. 8, the terminal 800 may include a processor 801, a transceiver 802, and a memory 803. The memory 803 may be used to store a program and code that are preinstalled at the time of shipment of the terminal 800, and may also be used to store code and the like that are executed by the processor 801.
Based on the same technical concept, the embodiment of the present application further provides a random access apparatus, which can execute the above method embodiments.
Fig. 9 is a schematic structural diagram of a random access apparatus according to an embodiment of the present application.
Referring to fig. 9, the apparatus 900 includes:
a processing unit 901, configured to determine that a network device is accessed in a contention random access manner, where the terminal is a terminal that is switched from a normal mode to an enhanced mode;
a transceiver unit 902, configured to return to the normal mode and access the network device in the contention random access manner.
Optionally, the transceiver unit 902 is specifically configured to:
returning to a normal mode before initiating random access; or
And returning to the normal mode after receiving a Random Access Response (RAR) message sent by the network equipment.
It should be understood that the above division of the units is only a division of logical functions, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. In this embodiment, the transceiver 902 may be implemented by a transceiver, and the processing unit 901 may be implemented by a processor. As shown in fig. 10, terminal 1000 can include a processor 1001, a transceiver 1002, and a memory 1003. Memory 1003 may be used to store a program and code that are preinstalled at the time of shipment of terminal 1000, and may also store code and the like used when processor 1001 executes.
In the embodiment of the present application, the transceiver may be a wired transceiver, a wireless transceiver, or a combination thereof. The wired transceiver may be, for example, an ethernet interface. The ethernet interface may be an optical interface, an electrical interface, or a combination thereof. The wireless transceiver may be, for example, a wireless local area network transceiver, a cellular network transceiver, or a combination thereof. The processor may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP. The processor may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof. The memory may include a volatile memory (RAM), such as a random-access memory (RAM); the memory may also include a non-volatile memory (ROM), such as a read-only memory (ROM), a flash memory (flash memory), a hard disk (HDD) or a solid-state drive (SSD); the memory may also comprise a combination of memories of the kind described above.
A bus interface may also be included in fig. 6, 8, and 10, which may include any number of interconnected buses and bridges, with various circuits of one or more processors, represented by a processor, and memory, represented by a memory, linked together. The bus interface may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface.
The embodiment of the present application further provides a computer-readable storage medium, which is used for storing computer software instructions required to be executed for executing the processor, and which contains a program required to be executed for executing the processor.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (13)
1. A random access method, the method comprising:
the network equipment sends configuration information to a terminal, wherein the configuration information is used for indicating the terminal to be switched from a normal mode to an enhanced mode;
the network equipment determines that the terminal accesses the network equipment in a random access mode;
the network equipment sends a Random Access Response (RAR) message to the terminal, wherein the RAR message comprises an uplink grant (UL grant), the UL grant comprises a field for indicating the repetition times of a message 3 comprising a random access process, and the field for indicating the repetition times of the message 3 of the random access process is used for indicating a Transmission Power Control (TPC) command of a physical uplink shared channel when the terminal is in a normal mode.
2. The method of claim 1, wherein before the network device determines that the terminal accesses the network device through the random access method, the method further comprises:
and the network equipment determines that the terminal has uplink desynchronizing.
3. The method of claim 1, wherein the random access mode is non-contention random access.
4. A random access method, the method comprising:
a terminal receives configuration information sent by network equipment, wherein the configuration information is used for indicating the terminal to be switched from a normal mode to an enhanced mode;
the terminal receives a Random Access Response (RAR) message from the network equipment, wherein the RAR message comprises an uplink grant (UL grant), the UL grant comprises a field for indicating the repetition number of a message 3 in a random access process, and the field for indicating the repetition number of the message 3 in the random access process is used for indicating a Transmission Power Control (TPC) command of a physical uplink shared channel when the terminal is in a normal mode;
and the terminal accesses the network equipment in a random access mode according to the field of the repetition times of the message 3 for indicating the random access process.
5. The method according to claim 4, wherein before the terminal receives the RAR message, the method further comprises:
and the terminal generates uplink desynchronization.
6. The method according to claim 4 or 5, wherein the random access mode is non-contention random access.
7. A communications apparatus, the apparatus comprising:
the method comprises the steps of sending configuration information to a terminal, wherein the configuration information is used for indicating the terminal to be switched from a normal mode to an enhanced mode;
unit for confirming the terminal accessing network equipment by random access mode
A unit configured to send a Random Access Response (RAR) message to the terminal, where the RAR message includes an uplink grant (UL grant), the UL grant includes a field indicating a number of repetitions of a message 3 in a random access procedure, and the field indicating the number of repetitions of the message 3 in the random access procedure is used to indicate a Transmit Power Control (TPC) command of a physical uplink shared channel when the terminal is in a normal mode.
8. The apparatus of claim 7, wherein the communication apparatus further comprises:
and the unit is used for determining that the terminal has uplink desynchronization.
9. The apparatus according to claim 7 or 8, wherein the random access scheme is non-contention random access.
10. A communications apparatus, the apparatus comprising:
the terminal comprises a unit for receiving configuration information from a network device, wherein the configuration information is used for indicating the terminal to be switched from a normal mode to an enhanced mode;
a unit configured to receive a random access response RAR message, where the RAR message includes an uplink grant UL grant, the UL grant includes a field indicating a number of repetitions of a message 3 of a random access procedure, and the field indicating the number of repetitions of the message 3 of the random access procedure is used to indicate a transmit power control, TPC, command of a physical uplink shared channel when the terminal is in a normal mode.
11. The apparatus of claim 10, further comprising: and the unit is used for determining that the terminal has uplink desynchronization.
12. The apparatus according to claim 10 or 11, wherein the random access scheme is non-contention random access.
13. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by a processor, causes the processor to perform the method of any of claims 1-3 or to implement the method of any of claims 4-6.
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| CN111436141A (en) * | 2019-03-25 | 2020-07-21 | 维沃移动通信有限公司 | Information transmission and receiving method, terminal and network side equipment |
| CN110809902B (en) * | 2019-09-30 | 2023-10-10 | 北京小米移动软件有限公司 | Information processing method and device, communication equipment and storage medium |
| CN110753349B (en) * | 2019-10-29 | 2020-10-27 | 西安交通大学 | Method and equipment for identifying pseudo base station |
| CN113973393A (en) * | 2020-07-24 | 2022-01-25 | 维沃移动通信有限公司 | Random access method, device, equipment and system |
| CN113973395B (en) * | 2020-07-24 | 2024-01-26 | 维沃移动通信有限公司 | Random access method, configuration method and related equipment |
| KR20230073307A (en) * | 2020-09-29 | 2023-05-25 | 후아웨이 테크놀러지 컴퍼니 리미티드 | Communication method and device |
| EP4278827A1 (en) * | 2021-01-15 | 2023-11-22 | Qualcomm Incorporated | Spatial domain transmission relation considerations for shared channel repetitions |
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