CN114287166B

CN114287166B - Coverage enhancement method for third message repetition based on four-step random access

Info

Publication number: CN114287166B
Application number: CN202180004410.1A
Authority: CN
Inventors: 江小威
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2021-12-06
Filing date: 2021-12-06
Publication date: 2024-04-05
Anticipated expiration: 2041-12-06
Also published as: WO2023102689A1; CN114287166A

Abstract

The embodiment of the disclosure discloses a coverage enhancement method and a coverage enhancement device for third message repetition based on four-step random access, which can be applied to the technical field of communication, wherein the method executed by terminal equipment comprises the following steps: and starting a third message msg3 repeat request mode in response to the current preamble transmission times being greater than the transmission threshold and the random access RA process meeting a preset condition. Therefore, the terminal equipment can start the third message msg3repetition mode under the condition that the current preamble transmission times are larger than the transmission threshold and the RA process meets the preset condition, so that the coverage enhancement effect is realized.

Description

Coverage enhancement method for third message repetition based on four-step random access

Technical Field

The disclosure relates to the technical field of communication, in particular to a coverage enhancement method and a coverage enhancement device for third message repetition based on four-step random access.

Background

In the communication system, one of the bottlenecks of uplink coverage is an uplink shared physical CHannel (Physical Uplink Share CHannel, PUSCH) CHannel for transmitting a third message msg3 in a four-step 4step Random Access (RA) procedure. In the related art, coverage may be enhanced by means of msg3 repetition.

Disclosure of Invention

The embodiment of the disclosure provides a coverage enhancement method and a coverage enhancement device for third message repetition based on four-step random access, which can be applied to the technical field of communication.

In a first aspect, an embodiment of the present disclosure provides a coverage enhancement method and an apparatus thereof for third message repetition based on four-step random access, where the method is performed by a terminal device, and the method includes: and starting a third message msg3 repeat request mode in response to the current preamble transmission times being greater than the transmission threshold and the random access RA process meeting a preset condition.

In the embodiment of the disclosure, the terminal device may start the third message msg3 repetition mode when the current preamble transmission times is greater than the transmission threshold and the RA process satisfies the preset condition, so as to achieve the coverage enhancement effect.

Optionally, the current preamble transmission number is greater than a transmission threshold, and is any one of the following:

the preamble transmission times in the two-step 2step RA process are larger than the maximum transmission times of the message A MsgA;

the preamble transmission times in the two-step 2step RA process are larger than the maximum transmission times of the rollback of the message A MsgA;

the preamble transmission times in the four-step 4step RA process are larger than the maximum transmission times of the first message Msg 1;

The preamble transmission times in the four-step 4step RA process are larger than the maximum transmission times of the backspacing of the Msg 1;

the preamble transmission times in the RA process are larger than the sum of the maximum transmission times of the MsgA and the maximum transmission times of the first message Msg 1.

Optionally, the method further comprises:

and receiving first indication information, wherein the first indication information is used for indicating the value of the transmission threshold.

Optionally, the receiving the first indication information includes:

receiving the first indication information through a broadcast message;

or,

and receiving the first indication information through a Radio Resource Control (RRC) message.

Optionally, the first indication information is further used for indicating a cell identifier corresponding to the transmission threshold, or a bandwidth part BWP identifier corresponding to the transmission threshold.

Optionally, the preset condition includes at least one of:

the random access process is incomplete;

the current RA type is 2step RA;

the current RA type is a 4step RA with a non-2 step RA backoff;

contention resolution contention resolution fails;

the current RA type is 4step RA rolled back by 2step RA;

the reference signal received power RSRP of the downlink loss reference point is smaller than the receiving threshold.

Optionally, the method further comprises:

And sending second indication information, wherein the second indication information is used for indicating whether the terminal equipment supports the msg3 repetition capability.

Optionally, the capability of whether the terminal device supports msg3 repetition includes at least one of:

the terminal equipment supports the capability of msg3 repetition under the condition of backing from 2step RA to 4step RA;

the terminal device supports the msg3 repetition capability or not in each frequency band.

In a second aspect, an embodiment of the present disclosure provides another coverage enhancement method and apparatus for third message repetition based on four-step random access, where the method is performed by a network device, and the method includes:

and determining that the terminal equipment starts a third message msg3 repeated repetition mode in response to the fact that the preamble transmission times sent by the currently received terminal equipment are larger than a transmission threshold value and the random access RA process meets a preset condition.

In the embodiment of the disclosure, the network device may determine that the terminal device starts the third message msg3 repeat request mode when the preamble transmission number sent by the currently received terminal device is greater than the transmission threshold and the random access RA process meets the preset condition, so that the network device may establish connection with the terminal device based on the msg3 repeatedly sent by the terminal device, and further achieve the coverage enhancement effect.

Optionally, the method further comprises:

and sending first indication information, wherein the first indication information is used for indicating the value of the transmission threshold value.

Optionally, the sending the first indication information includes:

transmitting the first indication information through a broadcast message;

or,

and sending the first indication information through a Radio Resource Control (RRC) message.

Optionally, the preset condition includes at least one of:

the random access process is incomplete;

the current RA type is 2step RA;

the current RA type is a 4step RA with a non-2 step RA backoff;

contention resolution contention resolution fails;

the current RA type is 4step RA rolled back by 2step RA;

Optionally, the method further comprises:

and receiving second indication information, wherein the second indication information is used for indicating whether the terminal equipment supports the msg3 repetition capability.

In a third aspect, an embodiment of the present disclosure provides a communication apparatus having a function of implementing part or all of the terminal device in the method described in the first aspect, for example, a function of the communication apparatus may be provided with a function in part or all of the embodiments of the present disclosure, or may be provided with a function of implementing any one of the embodiments of the present disclosure separately. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the functions described above.

In a fourth aspect, an embodiment of the present disclosure provides another communications apparatus having a function of implementing part or all of the network device in the method example described in the second aspect, for example, a function of the communications apparatus may be provided with a function in part or all of the embodiments of the present disclosure, or may be provided with a function of implementing any one of the embodiments of the present disclosure separately. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the functions described above.

In a fifth aspect, embodiments of the present disclosure provide a communication device comprising a processor, which when invoking a computer program in memory, performs the method of the first aspect described above.

In a sixth aspect, embodiments of the present disclosure provide a communication device comprising a processor that, when invoking a computer program in memory, performs the method of the second aspect described above.

In a seventh aspect, embodiments of the present disclosure provide a communication apparatus comprising a processor and a memory, the memory having a computer program stored therein; the computer program, when executed by the processor, causes the communication device to perform the method of the first aspect described above.

In an eighth aspect, embodiments of the present disclosure provide a communication apparatus comprising a processor and a memory, the memory having a computer program stored therein; the computer program, when executed by the processor, causes the communication device to perform the method of the second aspect described above.

In a ninth aspect, embodiments of the present disclosure provide a communications apparatus comprising a processor and interface circuitry for receiving code instructions and transmitting to the processor, the processor being configured to execute the code instructions to cause the apparatus to perform the method of the first aspect described above.

In a tenth aspect, embodiments of the present disclosure provide a communications device comprising a processor and interface circuitry for receiving code instructions and transmitting to the processor, the processor being configured to execute the code instructions to cause the device to perform the method of the second aspect described above.

In an eleventh aspect, an embodiment of the disclosure provides a communication system, where the system includes a communication device according to the third aspect and a communication device according to the fourth aspect, or where the system includes a communication device according to the fifth aspect and a communication device according to the sixth aspect, or where the system includes a communication device according to the seventh aspect and a communication device according to the eighth aspect, or where the system includes a communication device according to the ninth aspect and a communication device according to the tenth aspect.

In a twelfth aspect, an embodiment of the present invention provides a computer readable storage medium storing instructions for use by the terminal device, where the instructions, when executed, cause the method of the first aspect to be implemented.

In a thirteenth aspect, an embodiment of the present invention provides a computer readable storage medium storing instructions for use by a network device as described above, which when executed cause the method of the second aspect to be implemented.

In a fourteenth aspect, the present disclosure also provides a computer program product comprising a computer program which, when run on a computer, causes the computer to perform the method of the first aspect described above.

In a fifteenth aspect, the present disclosure also provides a computer program product comprising a computer program which, when run on a computer, causes the computer to perform the method of the second aspect described above.

In a sixteenth aspect, the present disclosure provides a chip system comprising at least one processor and an interface for supporting a terminal device to implement the functionality referred to in the first aspect, e.g. to determine or process at least one of data and information referred to in the above-mentioned method. In one possible design, the chip system further includes a memory for holding computer programs and data necessary for the terminal device. The chip system can be composed of chips, and can also comprise chips and other discrete devices.

In a seventeenth aspect, the present disclosure provides a chip system comprising at least one processor and an interface for supporting a network device to implement the functionality referred to in the second aspect, e.g. to determine or process at least one of data and information referred to in the above-described method. In one possible design, the chip system further includes a memory to hold computer programs and data necessary for the network device. The chip system can be composed of chips, and can also comprise chips and other discrete devices.

In an eighteenth aspect, the present disclosure provides a computer program which, when run on a computer, causes the computer to perform the method of the first aspect described above.

In a nineteenth aspect, the present disclosure provides a computer program which, when run on a computer, causes the computer to perform the method of the second aspect described above.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the background of the present disclosure, the following description will explain the drawings that are required to be used in the embodiments or the background of the present disclosure.

Fig. 1 is a schematic architecture diagram of a communication system provided in an embodiment of the present disclosure;

Fig. 2 is a schematic flow chart of a coverage enhancement method for third message repetition based on four-step random access according to an embodiment of the present disclosure;

fig. 3 is a schematic flow chart of a coverage enhancement method for third message repetition based on four-step random access according to another embodiment of the present disclosure;

fig. 4 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access according to another embodiment of the present disclosure;

fig. 5 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access according to another embodiment of the present disclosure;

fig. 6 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access according to another embodiment of the present disclosure;

fig. 7 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access according to another embodiment of the present disclosure;

fig. 8 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access according to another embodiment of the present disclosure;

fig. 9 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access according to another embodiment of the present disclosure;

Fig. 10 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access according to another embodiment of the present disclosure;

fig. 11 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access according to another embodiment of the present disclosure;

fig. 12 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access according to another embodiment of the present disclosure;

fig. 13 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access according to another embodiment of the present disclosure;

fig. 14 is a schematic structural view of a communication device according to an embodiment of the present disclosure;

fig. 15 is a schematic structural view of a communication device according to another embodiment of the present disclosure;

fig. 16 is a schematic structural diagram of a chip according to an embodiment of the disclosure.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.

It is understood that the term "plurality" in this disclosure means two or more, and other adjectives are similar thereto. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. The singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

For ease of understanding, the terms referred to in this application are first introduced.

1. Random Access (RA)

The random access procedure refers to a procedure before attempting to access the network from the time when the user transmits the random access preamble until a basic signaling connection is established with the network. Random access is a very critical step in a mobile communication system and is the last step in which a terminal device establishes a communication link with a network. The terminal device can exchange information with the network device through random access. The random access procedure may include two-step random access and four-step random access.

The four-step 4step random access process comprises the following steps: the terminal equipment sends a random access preamble through a first message msg 1; the network device sends a random access response message (Random Access Response, RAR) through a second message msg 2; the terminal device sends a radio resource control (radio resource control, RRC) connection request through a third message msg 3; the terminal device receives the RRC connection establishment through the fourth message msg4 (this procedure is also referred to as contention resolution contention resolution procedure)

The two-step 2step random access procedure includes: the terminal device sends an A message msgA to the network device, and the network device sends a B message msgB to the terminal device. Wherein, msgA contains equivalent content of msg1 and msg3 in four-step random access; msgB contains equivalent contents to msg2 and msg4 in four-step random access.

2. Third message (msg 3)

The third message in the 4step random access procedure is called Msg3, and the content of the Msg3 message may be different according to the state of the terminal device and the application scenario. The Msg3 needs to contain an important information: each terminal device is uniquely identified, which will be used for the fourth step contention resolution in the four step random access.

3. Radio resource control (radio resource control, RRC)

The radio resource control (radio resource control, RRC), also called radio resource management or radio resource allocation, means that radio resource management, control and scheduling are performed by a certain policy and means, and under the condition of meeting the requirements of quality of service, the limited radio network resources are fully utilized as much as possible, so as to ensure that the planned coverage area is reached, and the service capacity and the resource utilization rate are improved as much as possible.

In order to better understand the coverage enhancement method and the device for the third message repetition based on the four-step random access disclosed in the embodiments of the present disclosure, a communication system to which the embodiments of the present disclosure are applicable is first described below.

Referring to fig. 1, fig. 1 is a schematic architecture diagram of a communication system according to an embodiment of the disclosure. The communication system may include, but is not limited to, a network device, a terminal device, and the number and form of devices shown in fig. 1 are only for example and not limiting the embodiments of the disclosure, and may include two or more network devices and two or more terminal devices in practical applications. The communication system shown in fig. 1 may comprise a network device 11, a terminal device 12.

It should be noted that the technical solution of the embodiment of the present disclosure may be applied to various communication systems. For example: a long term evolution (long term evolution, LTE) system, a fifth generation (5th generation,5G) mobile communication system, a 5G New Radio (NR) system, or other future new mobile communication systems, etc.

The network device 11 in the embodiment of the present disclosure is an entity for transmitting or receiving signals at the network side. For example, the network device 11 may be an evolved NodeB (eNB), a transmission point (transmission reception point, TRP), a next generation NodeB (gNB) in an NR system, a base station in other future mobile communication systems or an access node in a wireless fidelity (wireless fidelity, wiFi) system, or the like. The embodiments of the present disclosure do not limit the specific technology and specific device configuration employed by the network device. The network device provided by the embodiments of the present disclosure may be composed of a Central Unit (CU) and a Distributed Unit (DU), where the CU may also be referred to as a control unit (control unit), the structure of the CU-DU may be used to split the protocol layers of the network device, such as a base station, and the functions of part of the protocol layers are placed in the CU for centralized control, and the functions of part or all of the protocol layers are distributed in the DU, so that the CU centrally controls the DU.

The terminal device 12 in the embodiments of the present disclosure is an entity on the user side for receiving or transmitting signals, such as a mobile phone. The terminal device may also be referred to as a terminal device (terminal), a User Equipment (UE), a Mobile Station (MS), a mobile terminal device (MT), etc. The terminal device may be an automobile with a communication function, a smart car, a mobile phone (mobile phone), a wearable device, a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an augmented reality (augmented reality, AR) terminal device, a wireless terminal device in industrial control (industrial control), a wireless terminal device in unmanned-driving (self-driving), a wireless terminal device in teleoperation (remote medical surgery), a wireless terminal device in smart grid (smart grid), a wireless terminal device in transportation safety (transportation safety), a wireless terminal device in smart city (smart city), a wireless terminal device in smart home (smart home), or the like. The embodiment of the present disclosure does not limit the specific technology and the specific device configuration adopted by the terminal device.

It may be understood that, the communication system described in the embodiments of the present disclosure is for more clearly describing the technical solutions of the embodiments of the present disclosure, and is not limited to the technical solutions provided in the embodiments of the present disclosure, and those skilled in the art can know that, with the evolution of the system architecture and the appearance of new service scenarios, the technical solutions provided in the embodiments of the present disclosure are equally applicable to similar technical problems.

The coverage enhancement method for the third message repetition based on the four-step random access provided by the present disclosure is described in detail below with reference to the accompanying drawings.

Referring to fig. 2, fig. 2 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access, which is performed by a terminal device according to an embodiment of the present disclosure. As shown in fig. 2, the method may include, but is not limited to, the steps of:

and step 21, starting a third message msg3 to repeat the repetition mode in response to the current preamble transmission times being greater than the transmission threshold and the random access RA process meeting the preset condition.

It should be noted that, in the related art, coverage may be enhanced by means of msg3 repetition. However, in the 4step RA procedure, whether the terminal device turns on msg3 repetition; or, after 2step RA rollbacks to 4step RA, whether Msg3 repetition can be started; alternatively, in the case of turning on the Msg3 repetition after supporting 2step RA fallback to 4step RA, under what conditions the Msg3 repetition may be turned on; alternatively, during a 2step RA, it is not yet determined whether the terminal device can start msg3 repetition before backing up to a 4step RA.

In addition, if the terminal device determines whether to start the Msg3 repetition based on the condition that the preamble transmission number is greater than the maximum transmission number (Msg 1-TransMax) of Msg1 in the case that the Msg3 repetition is started after 2-step RA fallback to 4-step RA is not supported, the current 4-step RA may be from 2-step RA fallback, and the value of the maximum transmission number (MsgA-TransMax) of MsgA configured by the network device is smaller than the value of Msg1-TransMax, the preamble transmission number may still satisfy the condition that is greater than Msg1-TransMax, so that when 2-step RA fallback to 4-step RA is not supported to start the Msg3 repetition, the Msg3 repetition is started, and thus the Msg3 repetition is started abnormally.

Therefore, in the present disclosure, a method for starting a third message repetition mode of four-step random access is provided, so that abnormal starting of an Msg3 repetition mode is avoided while coverage enhancement is achieved.

Optionally, the current preamble transmission number is greater than the transmission threshold, and may be any one of the following:

the preamble transmission times in the two-step 2step random access RA process are larger than the maximum transmission times (msgA-TransMax) of the message A MsgA;

The preamble transmission times in the two-step 2step RA process are larger than the rollback maximum transmission times (msgA-TransMax-CE) of the message A MsgA;

the preamble transmission times in the four-step 4step RA process are larger than the maximum transmission times (Msg 1-TransMax) of the first message Msg 1;

the preamble transmission times in the four-step 4step RA process are larger than the rollback maximum transmission times (Msg 1-TransMax-fallback) of Msg 1;

It is understood that the RA procedure may include 2step RA and 4step RA, i.e., the total number of transmissions of the preamble in the 2step RA and 4step RA procedures is greater than the sum of the maximum number of transmissions of MsgA and the maximum number of transmissions of Msg 1.

Optionally, the preset condition may include at least one of:

the random access process is incomplete;

the current RA type is 2step RA;

the current RA type is a 4step RA with a non-2 step RA backoff;

contention resolution contention resolution fails;

the current RA type is 4step RA rolled back by 2step RA;

the downlink loss reference point reference signal received power (Reference Signal Receiving Power, RSRP) is less than the receive threshold.

By implementing the embodiment of the disclosure, the terminal device can start the third message msg3 repetition mode under the condition that the current preamble transmission times are greater than the transmission threshold and the RA process meets the preset condition, thereby realizing the coverage enhancement effect.

Referring to fig. 3, fig. 3 illustrates a coverage enhancement method for third message repetition based on four-step random access provided in the present disclosure, taking as an example that the Msg3 repetition mode is turned on after 2-step RA fallback to 4-step RA is not supported. Fig. 3 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access, which is performed by a terminal device according to an embodiment of the present disclosure. As shown in fig. 3, the method may include, but is not limited to, the steps of:

step 31, receiving first indication information, where the first indication information is used to indicate a value of the transmission threshold.

It should be noted that, in the embodiment of the present disclosure, the value of the transmission threshold indicated by the first indication information may be the maximum transmission number of Msg1 for the case that Msg3 repetition is started after 2-step RA fallback to 4-step RA is not supported.

Optionally, the terminal device may receive the first indication information through a broadcast message; alternatively, the terminal device may receive the first indication information through a radio resource control RRC message.

Alternatively, the broadcast message may be a SIB1 (System Information Block Type 1) message, which is not limited by the present disclosure.

Optionally, the first indication information may also be used to indicate a cell identifier corresponding to the transmission threshold. That is, only if the cell to be accessed by the terminal device is the cell indicated by the cell identifier, it can be determined whether to turn on the msg3 repetition mode based on the transmission threshold.

Alternatively, a BandWidth Part (BWP) identification corresponding to the transmission threshold. That is, only in the case where the bandwidth portion to be used by the terminal device is the bandwidth portion indicated by the bandwidth portion identification, it is possible to determine whether to turn on the msg3 repetition mode based on the transmission threshold.

Step 32, turning on the msg3 repetition mode when the current preamble transmission number is greater than the transmission threshold, the RA procedure is not completed, the current RA type is 4step RA with non-2 step RA backoff, and the downlink loss reference point RSRP is less than the reception threshold.

In the embodiment of the disclosure, after receiving an RAR sent by a network device, if the terminal device determines that an RA procedure is not completed, and the current 4-step RA is not returned by a 2-step RA fallback, and the PREAMBLE TRANSMISSION frequency is greater than Msg1-TransMax indicated by the first indication information, that is, preamble_transmission_counter=msg1-transmax+1, the terminal device may start the Msg3 repetition mode.

Optionally, before starting the msg3 repetition, the terminal device may further determine whether the RSRP of the downlink path loss reference point is smaller than the receiving threshold, and start the msg3 repetition mode when the RSRP of the downlink path loss reference point is smaller than the receiving threshold. The receive Threshold may be an RSRP Threshold (RSRP-Threshold-msg 3 repetition) of msg3 repetition, which is not limited by the present disclosure.

Optionally, after determining that the 4-step RA procedure is not completed, the terminal device may first determine whether the msg3 repetition mode has been started, and further determine whether preset conditions such as 4step RA with a current RA type of non-2 step RA backoff, a downlink path loss reference point RSRP being smaller than a receiving threshold, and a current preamble transmission frequency being greater than msg1-TransMax are met under the condition that the msg3 repetition mode is not started. Thus, resources of the terminal device can be saved.

By implementing the embodiment of the disclosure, after receiving the value of the transmission threshold indicated by the network device, the terminal device further starts the msg3 repetition mode under the conditions that the current preamble transmission times are greater than the transmission threshold, the random access process is not completed, the current RA type is 4step RA with non-2 step RA back and the downlink path loss reference point RSRP is less than the receiving threshold, thereby realizing the coverage enhancement effect.

Referring to fig. 4, fig. 4 illustrates a coverage enhancement method for third message repetition based on four-step random access provided in the present disclosure, taking as an example that the Msg3 repetition mode is turned on after 2-step RA fallback to 4-step RA is not supported. Fig. 4 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access, which is performed by a terminal device according to an embodiment of the present disclosure. As shown in fig. 4, the method may include, but is not limited to, the steps of:

step 41, receiving first indication information, where the first indication information is used to indicate the value of the transmission threshold.

The specific implementation manner of step 41 may refer to the detailed steps in other embodiments in this disclosure, and will not be described in detail herein.

In step 42, when the current preamble transmission number is greater than the transmission threshold, the RA procedure satisfies that the random access procedure is not completed, the current RA type is 4step RA with non-2 step RA backoff, the downlink path loss reference point RSRP is less than the reception threshold, and contention resolution fails, the msg3 repetition mode is started.

In the embodiment of the disclosure, after contention resolution failure, if the terminal device determines that the RA procedure is not completed and the current 4-step RA is not returned by the 2-step RA fallback, and the PREAMBLE TRANSMISSION frequency is greater than Msg1-TransMax indicated by the first indication information, i.e., preamble_transmission_counter=msg1-transmax+1, the terminal device may start the Msg3 repetition mode.

Optionally, before starting the msg3 repetition, the terminal device may further determine whether the RSRP of the downlink path loss reference point is smaller than the receiving threshold at the same time, and start the msg3 repetition mode under the condition that the RSRP of the downlink path loss reference point is smaller than the receiving threshold. The receive Threshold may be an RSRP Threshold (RSRP-Threshold-msg 3 repetition) of msg3 repetition, which is not limited by the present disclosure.

Optionally, after determining that the 4-step RA procedure is not completed, the terminal device may first determine whether the msg3 repetition mode is already turned on, and further determine whether preset conditions such as 4step RA with the current RA type being a non-2 step RA backoff, the downlink path loss reference point RSRP being less than the receiving threshold, contention resolution failure, and the current preamble transmission frequency being greater than msg1-TransMax are met under the condition that the msg3 repetition mode is not turned on. Thus, resources of the terminal device can be saved.

By implementing the embodiment of the disclosure, after receiving the value of the transmission threshold indicated by the network device, the terminal device starts the msg3 repetition mode under the conditions that the current preamble transmission times are greater than the transmission threshold, the random access process is not completed, the current RA type is 4step RA with non-2 step RA back, the downlink path loss reference point RSRP is less than the receiving threshold, and the contention resolution contention resolution fails, thereby realizing the coverage enhancement effect.

Referring to fig. 5, fig. 5 illustrates a coverage enhancement method for supporting a third message repetition based on four-step random access provided in the present disclosure, by taking an example of starting an Msg3 repetition mode after 2-step RA rollback to 4-step RA. Fig. 5 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access, which is performed by a terminal device according to an embodiment of the present disclosure. As shown in fig. 5, the method may include, but is not limited to, the steps of:

step 51, receiving first indication information, where the first indication information is used to indicate a value of a transmission threshold.

It should be noted that, for the case that Msg3 repetition is started after 2-step RA is supported to 4-step RA, in the embodiment of the present disclosure, the value of the transmission threshold indicated by the first indication information may be the sum of the maximum transmission number of MsgA and the maximum transmission number of Msg 1.

The specific implementation manner of step 51 may refer to the detailed steps in other embodiments in this disclosure, and will not be described in detail herein.

In step 52, when the current preamble transmission number is greater than the transmission threshold, and the RA procedure satisfies that the random access procedure is not completed, the current RA type is 4step RA backed off by 2step RA, the downlink loss reference point RSRP is less than the reception threshold, and contention resolution fails, the msg3 repetition mode is turned on.

In the embodiment of the disclosure, after the terminal device receives the RAR phase, or after contention resolution fails, it is determined that the RA procedure is not completed, the current RA type is 4step RA, the current 4-step RA is returned by 2-step RA fallback, and msg1-TransMax is applied to the terminal device, and then when preamble_transmission_counter=msg1-transmax+msga-transmax+1, the terminal device can start the msg3 repetition mode.

Optionally, after determining that the 4-step RA procedure is not completed, the terminal device may first determine whether the msg3repetition mode is already started, and further determine whether preset conditions, such as whether the current RA type is a 4-step RA backed by a 2-step RA, the downlink path loss reference point RSRP is smaller than a receiving threshold, and the current preamble transmission frequency is greater than the sum of msg 1-fransmax and msgA-fransmax, are satisfied under the condition that the msg3repetition mode is not started. Thus, resources of the terminal device can be saved.

By implementing the embodiment of the disclosure, after receiving the value of the transmission threshold indicated by the network device, the terminal device starts the msg3repetition mode under the conditions that the current preamble transmission times are greater than the transmission threshold and the random access process is not completed, the current RA type is 4step RA backed by 2step RA, the RSRP of the downlink path loss reference point is less than the receiving threshold and the contention resolution contention resolution fails, thereby realizing the coverage enhancement effect.

Referring to fig. 5, fig. 5 illustrates a coverage enhancement method for supporting a third message repetition based on four-step random access provided in the present disclosure, by taking an example of starting an Msg3repetition mode after 2-step RA rollback to 4-step RA. Fig. 5 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access, which is performed by a terminal device according to an embodiment of the present disclosure. As shown in fig. 5, the method may include, but is not limited to, the steps of:

It should be noted that, for the case where the Msg3 repetition is started after the 2-step RA fallback is supported to the 4-step RA, in the embodiment of the present disclosure, the transmission threshold indicated by the first indication information may be a value of a maximum number of rollback transmissions (Msg 1-TransMax-fallback) of Msg 1.

In the embodiment of the disclosure, after the terminal device receives the RAR phase, or after contention resolution fails, it is determined that the RA procedure is not completed, the current RA type is 4step RA, the current 4-step RA is returned from 2-step RA fallback, and msg1-trans max-fallback applied by the terminal device, and then the terminal device may start the msg3 repetition mode when the preamble_trans mis_counter=msg1-trans max-fallback+1.

Optionally, after determining that the 4-step RA procedure is not completed, the terminal device may first determine whether the msg3 repetition mode is already started, and further determine whether preset conditions such as whether the current RA type is a 4-step RA backed-off by a 2-step RA, the downlink path loss reference point RSRP is smaller than a receiving threshold, and the current preamble transmission frequency is greater than msg1-trans max-fallback are met under the condition that the msg3 repetition mode is not started. Thus, resources of the terminal device can be saved.

By implementing the embodiment of the disclosure, after receiving the value of the transmission threshold indicated by the network device, the terminal device further starts the msg3 repetition mode under the conditions that the current preamble transmission times are greater than the transmission threshold, the random access process is not completed, the current RA type is 4step RA backed by 2step RA, the downlink path loss reference point RSRP is smaller than the receiving threshold, and contention resolution, thereby realizing the coverage enhancement effect.

step 51, receiving first indication information, where the first indication information is used to indicate a value of a transmission threshold. It should be noted that, for the case where Msg3 repetition is started after 2-step RA fallback to 4-step RA is supported, in the embodiment of the present disclosure, the value of the transmission threshold indicated by the first indication information may be the sum of the maximum transmission number of MsgA and the maximum transmission number of Msg 1.

In step 52, the msg3 repetition mode is started when the current preamble transmission number is greater than the transmission threshold, the RA procedure is not completed when the random access procedure is satisfied, the current RA type is 4step RA backed off by 2step RA, the downlink loss reference point RSRP is less than the reception threshold, and contention resolution.

In the embodiment of the disclosure, after the terminal device receives the RAR phase, or after contention resolution fails, it is determined that the RA procedure is not completed, the current RA type is 4step RA, the current 4-step RA is returned from 2-step RA fallback, and msg1-TransMax-fallback is applied to the terminal device, and then when the preamble_transmission_counter=msga-transmax+msg1-TransMax-fallback+1, the terminal device may start the msg3 repetition mode.

Optionally, after determining that the 4-step RA procedure is not completed, the terminal device may first determine whether the msg3 repetition mode is already started, and further determine whether preset conditions, such as whether the current RA type is a 4-step RA backed by a 2-step RA, the downlink path loss reference point RSRP is smaller than a receiving threshold, and the current preamble transmission frequency is greater than the sum of msgA-TransMax and msg1-TransMax, are satisfied under the condition that the msg3 repetition mode is not started. Thus, resources of the terminal device can be saved.

By implementing the embodiment of the disclosure, after receiving the value of the transmission threshold indicated by the network device, the terminal device further starts the msg3 repetition mode when the current preamble transmission times are greater than the transmission threshold and the random access procedure is not completed, the current RA type is 4step RA backed by 2step RA, the downlink loss reference point RSRP is less than the receiving threshold, and contention resolution fails, thereby realizing the coverage enhancement effect.

Referring to fig. 6, fig. 6 illustrates a coverage enhancement method provided by the present disclosure for third message repetition based on four-step random access, taking the 2-step RA period when the Msg3 repetition mode is turned on as an example. Fig. 6 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access, which is performed by a terminal device according to an embodiment of the present disclosure. As shown in fig. 6, the method may include, but is not limited to, the steps of:

step 61, receiving first indication information, wherein the first indication information is used for indicating the value of the transmission threshold.

It should be noted that, for the case where the Msg3 repetition mode is turned on during the 2-step RA, in the embodiment of the present disclosure, the value of the transmission threshold indicated by the first indication information may be a maximum backoff transmission number (Msg 1-trans max-fallback) of Msg 1.

Wherein, the specific implementation form of step 61 may refer to the detailed steps in other embodiments in this disclosure, and will not be described in detail herein.

Step 62, starting an msg3 repetition mode when the current preamble transmission times is greater than a transmission threshold, the RA process is not completed when the random access process is satisfied, the current RA type is 2step RA, and the downlink loss reference point RSRP is less than a reception threshold.

In the embodiment of the disclosure, after receiving the MsgB stage, or after contention resolution fails, the terminal device determines that the RA procedure is not completed, and the current RA type is 2step RA, and the terminal device applies msgA-TransMax-CE, then when preamble_transmission_counter=msga-TransMax-ce+1, the terminal device selects 4-step RA, and starts the msg3 repetition mode.

Optionally, before the terminal device selects the 4-step RA to start the msg3 repetition, the terminal device may further determine whether the RSRP of the downlink loss reference point is smaller than the receiving threshold, and start the msg3 repetition mode when the RSRP of the downlink loss reference point is smaller than the receiving threshold. The receive Threshold may be an RSRP Threshold (RSRP-Threshold-msg 3 repetition) of msg3 repetition, which is not limited by the present disclosure.

Optionally, after determining that the RA procedure is not completed, the terminal device may first determine whether the msg3 repetition mode has been started, and further determine whether preset conditions, such as the current RA type being 2step RA, the downlink path loss reference point RSRP being less than the receiving threshold, and the current preamble transmission frequency being greater than the msgA-TransMax-CE, are satisfied if the msg3 repetition mode is not started. Thus, resources of the terminal device can be saved.

By implementing the embodiment of the disclosure, after receiving the value of the transmission threshold indicated by the network device, the terminal device further starts the msg3 repetition mode under the conditions that the current preamble transmission times are greater than the transmission threshold, the random access process is not completed, the current RA type is 2step RA, and the downlink path loss reference point RSRP is smaller than the receiving threshold, thereby realizing the coverage enhancement effect.

Referring to fig. 7, fig. 7 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access, which is performed by a terminal device according to an embodiment of the present disclosure. As shown in fig. 7, the method may include, but is not limited to, the steps of:

step 71, sending second indication information, wherein the second indication information is used for indicating whether the terminal equipment supports the msg3 repetition capability.

Optionally, the capability of whether the terminal device supports msg3 repetition may include at least one of:

whether the terminal equipment supports the msg3 repetition capability or not in the case of backing from 2step RA to 4step RA;

whether the terminal device supports the msg3 repetition capability in each frequency band.

Optionally, the terminal device may report to the network device through the second indication information whether the terminal device supports the msg3 repetition capability in all frequency bands. Or, the second indication information may also be used to report to the network device whether the msg3 repetition capability is supported in each frequency band. That is, the second indication information may include an identifier of each frequency band and an ability of whether each frequency band supports msg3 repetition, which is not limited in the present disclosure.

For example, the terminal device may indicate, through one piece of second indication information, whether the terminal device supports the msg3 repetition capability in the frequency range 1 (FR 1) frequency band and the frequency range 2 (FR 2) frequency band, or may indicate, through different pieces of second indication information, whether the FR1 frequency band, the FR2-1 frequency band, and the FR2-2 frequency band support the msg3 repetition capability. The present disclosure is not limited in this regard.

Wherein the FR1 frequency band is 410MHz-7125MHz; the FR2 frequency band may be 24250MHz-52600MHz, or the FR2 frequency band may be 24250MHz-71000MHz. If the FR2 frequency band is 24250MHz-71000MHz, the FR2 frequency band can be divided into an FR2-1 frequency band and an FR2-2 frequency band, wherein the FR2-1 frequency band is 24250MHz-52600MHz; the FR2-2 band is 52600MHz-71000MHz.

Step 72, receiving first indication information, where the first indication information is used to indicate a value of a transmission threshold.

And step 73, starting an msg3repetition mode in response to the current preamble transmission times being larger than a transmission threshold and the RA process meeting a preset condition.

The specific implementation manner of step 72 and step 73 may refer to the detailed steps in other embodiments in the disclosure, and will not be described in detail herein.

It may be appreciated that in the embodiment of the present disclosure, the terminal device first sends, to the network device, whether the terminal device supports the msg3repetition capability, and then the network device may indicate, to the terminal device, a transmission threshold value if the terminal device supports the msg3repetition, so as to save resources of the network device and channel resources.

Through implementing the embodiment of the disclosure, the terminal equipment indicates to the network equipment whether the terminal equipment supports the msg3repetition capability, then receives the value of the transmission threshold indicated by the network equipment, and finally starts the msg3repetition mode under the condition that the current preamble transmission times are larger than the transmission threshold and the RA process meets the preset condition. Therefore, when the terminal equipment supports msg3repetition, the current preamble transmission times are larger than the transmission threshold, and the RA process meets the preset condition, the msg3repetition mode is started, so that the coverage enhancement effect is realized, and resources are saved.

Referring to fig. 8, fig. 8 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access, which is performed by a network device according to an embodiment of the present disclosure. As shown in fig. 8, the method may include, but is not limited to, the steps of:

in step 81, in response to the currently received preamble transmission times sent by the terminal device being greater than the transmission threshold and the RA procedure meeting the preset condition, it is determined that the terminal device has started the third message msg3 repeat request mode.

Optionally, the preset condition may include at least one of:

the random access process is incomplete;

the current RA type is 2step RA;

the current RA type is a 4step RA with a non-2 step RA backoff;

contention resolution contention resolution fails;

the current RA type is 4step RA rolled back by 2step RA;

By implementing the embodiment of the disclosure, the network device can determine that the terminal device starts the third message msg3 repeat request mode when the preamble transmission times sent by the currently received terminal device is greater than the transmission threshold value and the RA process meets the preset condition, so that the network device can establish connection with the terminal device based on the msg3 repeatedly sent by the terminal device, and further the coverage enhancement effect is achieved.

Referring to fig. 9, fig. 9 illustrates a coverage enhancement method for third message repetition based on four-step random access provided in the present disclosure, taking as an example that the Msg3 repetition mode is turned on after 2-step RA fallback to 4-step RA is not supported. Fig. 9 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access, which is performed by a network device according to an embodiment of the present disclosure. As shown in fig. 9, the method may include, but is not limited to, the steps of:

Step 91, sending first indication information, where the first indication information is used to indicate the value of the transmission threshold.

It should be noted that, in the embodiment of the present disclosure, the value of the transmission threshold indicated by the first indication information sent by the network device may be the maximum transmission number of Msg1 for the case that Msg3 repetition is started after 2-step RA fallback to 4-step RA is not supported.

Optionally, the network device may receive the first indication information through a broadcast message; alternatively, the network device also receives the first indication information through a radio resource control RRC message.

Step 92, determining that the terminal device starts the msg3 repetition mode when the preamble transmission number sent by the currently received terminal device is greater than the transmission threshold, the RA procedure is not completed when the random access procedure is satisfied, the current RA type is 4step RA with non-2 step RA back-off, and the downlink path loss reference point RSRP is less than the reception threshold.

In the embodiment of the disclosure, if after the network device sends the RAR to the terminal device, it is determined that the RA procedure is not completed, the current 4-step RA is not returned by the 2-step RA fallback, and the PREAMBLE TRANSMISSION frequency is greater than Msg1-TransMax indicated by the first indication information, that is, preamble_transmission_counter=msg1-transmax+1, and if the downlink path loss reference point RSRP is smaller than the receiving threshold, it is determined that the terminal device can start the Msg3 repetition mode.

The receive Threshold may be an RSRP Threshold (RSRP-Threshold-msg 3 repetition) of msg3 repetition, which is not limited by the present disclosure.

Optionally, after determining that the 4-step RA procedure is not completed, the network device may first determine whether the terminal device has started the msg3 repetition mode, and further determine whether the current RA type is 4step RA with a non-2 step RA backoff, the downlink loss reference point RSRP is smaller than the receiving threshold, and the current preamble transmission frequency is greater than the msg1-TransMax preset condition if the terminal device does not start the msg3 repetition mode. Thus, resources of the network device can be saved.

By implementing the embodiment of the disclosure, the network device firstly sends the first indication information of the value of the transmission threshold for indication to the terminal device, and then determines that the terminal device starts the msg3 repetition mode under the conditions that the preamble transmission times sent by the currently received terminal device is larger than the transmission threshold, the random access process is not completed, the current RA type is 4step RA with non-2 step RA back and the downlink path loss reference point RSRP is smaller than the reception threshold, so that the network device can establish connection with the terminal device based on the msg3 repeatedly sent by the terminal device, and further the coverage enhancement effect is realized.

Referring to fig. 10, fig. 10 illustrates a coverage enhancement method for third message repetition based on four-step random access provided in the present disclosure, taking as an example that the Msg3 repetition mode is turned on after 2-step RA fallback to 4-step RA is not supported. Fig. 10 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access, which is performed by a network device according to an embodiment of the present disclosure. As shown in fig. 10, the method may include, but is not limited to, the steps of:

step 101, sending first indication information, wherein the first indication information is used for indicating the value of the transmission threshold value.

The specific implementation manner of step 101 may refer to the detailed steps in other embodiments in this disclosure, which will not be described in detail herein.

Step 102, determining that the terminal device starts the msg3 repetition mode when the preamble transmission number sent by the currently received terminal device is greater than the transmission threshold, the RA procedure is not completed when the random access procedure is satisfied, the current RA type is 4step RA with non-2 step RA back, the RSRP of the downlink loss reference point is less than the reception threshold, and contention resolution fails.

In the embodiment of the present disclosure, after contention resolution fails, if the RA procedure is not completed and the current 4-step RA is not returned by the 2-step RA fallback, and the PREAMBLE TRANSMISSION frequency is greater than Msg1-TransMax indicated by the first indication information, that is, preamble_transmission_counter=msg1-transmax+1, and the downlink path loss reference point RSRP is less than the receiving threshold, the network device may determine that the terminal device starts the Msg3 repetition mode.

By implementing the embodiment of the disclosure, the network device firstly sends the first indication information of the value of the transmission threshold for indication to the terminal device, and then determines that the terminal device starts the msg3 repetition mode under the conditions that the preamble transmission times sent by the currently received terminal device is larger than the transmission threshold, the random access process is not completed, the current RA type is 4step RA with non-2 step RA back, the downlink path loss reference point RSRP is smaller than the reception threshold and contention resolution fails, so that the network device can establish connection with the terminal device based on the msg3 repeatedly sent by the terminal device, and further the coverage enhancement effect is realized.

Referring to fig. 11, fig. 11 illustrates a coverage enhancement method for third message repetition based on four-step random access provided in the present disclosure, taking as an example turning on the Msg3 repetition mode after supporting 2-step RA fallback to 4-step RA. Fig. 11 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access, which is performed by a network device according to an embodiment of the present disclosure. As shown in fig. 11, the method may include, but is not limited to, the steps of:

Step 111, sending first indication information, where the first indication information is used to indicate a value of the transmission threshold.

The specific implementation manner of step 111 may refer to the detailed steps in other embodiments in this disclosure, and will not be described in detail herein.

Step 112, determining that the terminal device has started the msg3 repetition mode when the preamble transmission number sent by the currently received terminal device is greater than the transmission threshold, the RA procedure is not completed when the random access procedure is satisfied, the current RA type is 4step RA backed off by 2step RA, the RSRP of the downlink loss reference point is less than the reception threshold, and contention resolution fails.

In the embodiment of the disclosure, after the RAR phase is sent by the network device, or after contention resolution fails, it is determined that the RA procedure is not completed, the current RA type is 4step RA, the current 4-step RA is returned by 2-step RAfallback, and msg1-TransMax is applied by the terminal device, and if the preamble_transmission_counter=msg1-transmax+msga-transmax+1, and the downlink loss reference point RSRP is smaller than the reception threshold, it may be determined that the terminal device starts the msg3 repetition mode.

Optionally, after determining that the 4-step RA procedure is not completed, the network device may first determine whether the terminal device has already turned on the msg3 repetition mode, and further determine whether preset conditions, such as whether the current RA type is a 4-step RA backed-off by a 2-step RA, the downlink loss reference point RSRP is less than the reception threshold, and the current preamble transmission frequency is greater than the sum of msg 1-fransmax and msgA-fransmax, are satisfied if the terminal device does not turn on the msg3 repetition mode. Thus, resources of the network device can be saved.

By implementing the embodiment of the disclosure, the network device firstly sends the first indication information of the value of the transmission threshold for indication to the terminal device, and then determines that the terminal device starts the msg3 repetition mode under the conditions that the preamble transmission times sent by the currently received terminal device is larger than the transmission threshold, the random access process is not completed, the current RA type is 4step RA backed by 2step RA, the downlink path loss reference point RSRP is smaller than the reception threshold, and contention resolution fails, so that the network device can establish connection with the terminal device based on the msg3 repeatedly sent by the terminal device, and further the coverage enhancement effect is realized.

It should be noted that, for the case where the Msg3 repetition is started after the 2-step RAfallback to the 4-step RA are supported, in the embodiment of the present disclosure, the transmission threshold indicated by the first indication information may be the maximum number of transmission backs of Msg1 (Msg 1-TransMax-fallback).

In the embodiment of the disclosure, after the RAR phase is sent by the network device, or after contention resolution fails, it is determined that the RA procedure is not completed, the current RA type is 4step RA, the current 4-step RA is returned by 2-step RAfallback, and msg1-TransMax-fallback applied by the terminal device, and if the preamble_transmission_counter=msg1-TransMax-fallback+1, and the downlink loss reference point RSRP is smaller than the reception threshold, it is determined that the terminal device starts the msg3 repetition mode.

Optionally, after determining that the 4-step RA procedure is not completed, the network device may first determine whether the msg3 repetition mode is already turned on, and further determine whether conditions such as whether the current RA type is a 4-step RA backed by a 2-step RA, the RSRP of the downlink path loss reference point is smaller than the receiving threshold, and the current preamble transmission frequency is greater than msg1-TransMax-fallback are met under the condition that the msg3 repetition mode is not turned on. Thus, resources of the network device can be saved.

It should be noted that, for the case where Msg3 repetition is started after 2-step rafalback to 4-step RA is supported, in the embodiment of the present disclosure, the value of the transmission threshold indicated by the first indication information may be the sum of the maximum transmission number of MsgA and the maximum transmission number of Msg 1.

In the embodiment of the disclosure, after the RAR phase is sent by the network device, or after contention resolution fails, it is determined that the RA procedure is not completed, the current RA type is 4step RA, the current 4-step RA is returned by 2-step RAfallback, and msg1-TransMax-fallback is applied by the terminal device, and then in the case that the preamble_transmission_counter=msga-transmax+msg1-TransMax-fallback+1, and the downlink path loss reference point RSRP is smaller than the receiving threshold, it is determined that the terminal device starts the msg3 repetition mode.

Optionally, after determining that the 4-step RA procedure is not completed, the network device may first determine whether the msg3 repetition mode is already turned on, and further determine whether preset conditions, such as whether the current RA type is a 4-step RA backed by a 2-step RA, the downlink path loss reference point RSRP is smaller than a receiving threshold, and the current preamble transmission frequency is greater than the sum of msgA-TransMax and msg1-TransMax, are met under the condition that the msg3 repetition mode is not turned on. Thus, resources of the network device can be saved.

Referring to fig. 12, fig. 12 illustrates a coverage enhancement method provided by the present disclosure for third message repetition based on four-step random access, taking the 2-step RA period when the Msg3 repetition mode is turned on as an example. Fig. 12 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access, which is performed by a network device according to an embodiment of the present disclosure. As shown in fig. 12, the method may include, but is not limited to, the steps of:

step 121, sending first indication information, where the first indication information is used to indicate the value of the transmission threshold.

Wherein, the specific implementation manner of step 121 may refer to the detailed steps in other embodiments in the disclosure, which will not be described in detail herein.

Step 122, determining that the terminal device starts the msg3 repetition mode when the preamble transmission times sent by the currently received terminal device is greater than the transmission threshold, the RA procedure is not completed when the RA procedure satisfies the random access procedure, the current RA type is 2step RA, and the downlink path loss reference point RSRP is less than the reception threshold.

In the embodiment of the disclosure, after the network device sends the MsgB stage, or after contention resolution fails, it is determined that the RA procedure is not completed, and the current RA type is 2step RA, and the terminal device applies msgA-TransMax-CE, then if the preamble_transmission_counter=msga-TransMax-ce+1, and the downlink path loss reference point RSRP is smaller than the reception threshold, it is determined that the terminal device selects 4-step RA, and the msg3 repetition mode is turned on.

Optionally, after determining that the RA procedure is not completed, the network device may first determine whether the msg3 repetition mode is already turned on, and further determine whether preset conditions, such as the current RA type being 2step RA, the downlink path loss reference point RSRP being less than the receiving threshold, and the current preamble transmission frequency being greater than the msgA-TransMax-CE, are met if the msg3 repetition mode is not turned on. Thus, resources of the network device can be saved.

By implementing the embodiment of the disclosure, the network device firstly sends the first indication information of the value of the transmission threshold for indication to the terminal device, and then determines that the terminal device starts the msg3 repetition mode when the preamble transmission times sent by the currently received terminal device is greater than the transmission threshold, the random access process is not completed, the current RA type is 2step RA, and the downlink path loss reference point RSRP is smaller than the reception threshold, so that the network device can establish connection with the terminal device based on the msg3 repeatedly sent by the terminal device, and further the coverage enhancement effect is realized.

Referring to fig. 13, fig. 13 is a flowchart of a coverage enhancement method for third message repetition based on four-step random access, which is performed by a network device according to an embodiment of the present disclosure. As shown in fig. 13, the method may include, but is not limited to, the steps of:

step 131, receiving second indication information, where the second indication information is used to indicate whether the terminal device supports the msg3 repetition capability.

Optionally, the second indication information is sent by the terminal device to the network device. The terminal device can report the second indication information to the network device whether the terminal device supports the msg3 repetition capability in all frequency bands. Or, the second indication information may also be used to report to the network device whether the msg3 repetition capability is supported in each frequency band. That is, the second indication information may include an identifier of each frequency band and an ability of whether each frequency band supports msg3 repetition, which is not limited in the present disclosure.

Step 132, sending first indication information, where the first indication information is used to indicate the value of the transmission threshold.

In step 133, in response to the preamble transmission number sent by the currently received terminal device being greater than the transmission threshold and the RA procedure meeting the preset condition, it is determined that the terminal device has turned on the msg3 repetition mode.

The specific implementation manner of step 132 and step 133 may refer to the detailed steps in other embodiments in the disclosure, which will not be described in detail herein.

It may be appreciated that in the embodiment of the present disclosure, the network device first receives the capability of whether the terminal device supports msg3 repetition sent by the terminal device, and then the network device may indicate the transmission threshold to the terminal device when the terminal device supports msg3 repetition, thereby saving the resources of the network device and the channel resources.

By implementing the embodiment of the disclosure, the network device firstly receives the second indication information sent by the terminal device and used for indicating whether the terminal device supports the msg3 repetition, then can take the value of the transmission threshold indicated to the terminal device by the first indication information under the condition that the terminal device supports the msg3 repetition, and finally determines that the terminal device starts the msg3 repetition mode under the condition that the currently received preamble transmission times are greater than the transmission threshold and the RA process meets the preset condition. Therefore, under the conditions that the terminal equipment supports msg3 repetition, the current received preamble transmission times are larger than a transmission threshold value and the RA process preset condition, the terminal equipment is determined to start an msg3 repetition mode, so that the network equipment can establish connection with the terminal equipment based on the msg3 repeatedly sent by the terminal equipment, the coverage enhancement effect is achieved, and resources are saved.

In the embodiments provided in the present disclosure, the method provided in the embodiments of the present disclosure is described from the perspective of the network device and the terminal device, respectively. In order to implement the functions in the method provided by the embodiments of the present disclosure, the network device and the terminal device may include a hardware structure, a software module, and implement the functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Some of the functions described above may be implemented in a hardware structure, a software module, or a combination of a hardware structure and a software module.

Fig. 14 is a schematic structural diagram of a communication device 140 according to an embodiment of the disclosure. The communication device 140 shown in fig. 14 may include a processing module 1401 and a transceiver module 1402.

The transceiver module 1402 may include a transmitting module for implementing a transmitting function and/or a receiving module for implementing a receiving function, and the transceiver module 1402 may implement the transmitting function and/or the receiving function.

It is understood that the communication device 140 may be a terminal device, a device in a terminal device, or a device that can be used in a matching manner with a terminal device.

A communication device 140, on the terminal device side, comprising:

a processing module 1401 is configured to, in response to the current preamble transmission number being greater than the transmission threshold and the random access RA process meeting a preset condition, start a third message msg3 to repeat the repetition mode.

Optionally, the current preamble transmission number is greater than the transmission threshold, and is any one of the following:

Optionally, the method further comprises:

the transceiver module 1402 is configured to receive first indication information, where the first indication information is used to indicate a value of a transmission threshold.

Optionally, the transceiver module 1402 is specifically configured to:

receiving first indication information through a broadcast message;

Or,

Optionally, the preset condition includes at least one of:

the random access process is incomplete;

the current RA type is 2step RA;

the current RA type is a 4step RA with a non-2 step RA backoff;

contention resolution contention resolution fails;

the current RA type is 4step RA rolled back by 2step RA;

Optionally, the transceiver module 1402 is further specifically configured to:

According to the communication device provided by the disclosure, the terminal equipment can start the third message msg3 repetition mode under the condition that the current preamble transmission times are larger than the transmission threshold and the random access RA process meets the preset condition, so that the coverage enhancement effect is realized.

It is understood that the communication device 140 may be a network device, a device in a network device, or a device that can be used in cooperation with a network device.

A communication apparatus 140, on the network device side, comprising:

a processing module 1401 is configured to determine that the terminal device starts a third message msg3 repeat request mode in response to the preamble transmission number sent by the currently received terminal device being greater than the transmission threshold and the random access RA process meeting a preset condition.

Optionally, the method further comprises:

The transceiver module 1402 is configured to send first indication information, where the first indication information is used to indicate a value of a transmission threshold.

Optionally, the transceiver module 1402 is specifically configured to:

transmitting first indication information through a broadcast message;

or,

Optionally, the preset condition includes at least one of:

the random access process is incomplete;

the current RA type is 2step RA;

the current RA type is a 4step RA with a non-2 step RA backoff;

contention resolution contention resolution fails;

the current RA type is 4step RA rolled back by 2step RA;

Optionally, the transceiver module 1402 is further specifically configured to:

According to the communication device provided by the disclosure, the network equipment can determine that the terminal equipment starts the third message msg3 repeat request mode when the preamble transmission times sent by the currently received terminal equipment is larger than the transmission threshold value and the RA process meets the preset condition, so that the network equipment can establish connection with the terminal equipment based on the msg3 repeatedly sent by the terminal equipment, and further the coverage enhancement effect is achieved.

Referring to fig. 15, fig. 15 is a schematic structural diagram of another communication device 150 according to an embodiment of the disclosure. The communication device 150 may be a network device, a terminal device, a chip system, a processor, or the like that supports the network device to implement the above method, or a chip, a chip system, a processor, or the like that supports the terminal device to implement the above method. The device can be used for realizing the method described in the method embodiment, and can be particularly referred to the description in the method embodiment.

The communications device 150 may include one or more processors 1501. The processor 1501 may be a general purpose processor or a special purpose processor, etc. For example, a baseband processor or a central processing unit. The baseband processor may be used to process communication protocols and communication data, and the central processor may be used to control communication devices (e.g., base stations, baseband chips, terminal equipment chips, DUs or CUs, etc.), execute computer programs, and process data of the computer programs.

Optionally, the communication device 150 may further include one or more memories 1502, on which a computer program 1504 may be stored, and the processor 1501 executes the computer program 1504, so that the communication device 150 performs the method described in the above method embodiments. Optionally, the memory 1502 may also store data. The communication device 150 and the memory 1502 may be provided separately or may be integrated.

Optionally, the communication device 150 may also include a transceiver 1505, an antenna 1506. The transceiver 1505 may be referred to as a transceiver unit, a transceiver, or a transceiver circuit, etc., for performing a transceiving function. Transceiver 1505 may include a receiver, which may be referred to as a receiver or receive circuitry, etc., for performing a receive function; the transmitter may be referred to as a transmitter or a transmitting circuit, etc., for implementing a transmitting function.

Optionally, one or more interface circuits 1507 may also be included in the communication device 150. The interface circuit 1507 is for receiving code instructions and transmitting them to the processor 1501. The processor 1501 executes the code instructions to cause the communication device 150 to perform the method described in the method embodiments described above.

The communication apparatus 150 is a terminal device: the processor 1501 is configured to perform step 21 in fig. 2; step 32 in fig. 3; step 42 in fig. 4; step 52 in fig. 5, and so on. Transceiver 1505 is used to perform step 31 in fig. 3; step 41 in fig. 4; or step 51 in fig. 5, etc.

The communication apparatus 150 is a network device: the processor 1501 is used to execute step 101 in fig. 10; step 112 in fig. 11; or step 122 in fig. 12, etc.; transceiver 1505 is used to perform step 111 in fig. 11; step 121 in fig. 12; step 131 in fig. 13, and so on.

In one implementation, the processor 1501 may include a transceiver to implement the receive and transmit functions. For example, the transceiver may be a transceiver circuit, or an interface circuit. The transceiver circuitry, interface or interface circuitry for implementing the receive and transmit functions may be separate or may be integrated. The transceiver circuit, interface or interface circuit may be used for reading and writing codes/data, or the transceiver circuit, interface or interface circuit may be used for transmitting or transferring signals.

In one implementation, the processor 1501 may store a computer program 1503, where the computer program 1503 runs on the processor 1501, and may cause the communication device 150 to perform the method described in the above method embodiments. The computer program 1503 may be resident in the processor 1501, in which case the processor 1501 may be implemented in hardware.

In one implementation, the communication device 150 may include circuitry that may implement the functions of transmitting or receiving or communicating in the foregoing method embodiments. The processors and transceivers described in this disclosure may be implemented on integrated circuits (integrated circuit, ICs), analog ICs, radio frequency integrated circuits RFICs, mixed signal ICs, application specific integrated circuits (application specific integrated circuit, ASIC), printed circuit boards (printed circuit board, PCB), electronic devices, and the like. The processor and transceiver may also be fabricated using a variety of IC process technologies such as complementary metal oxide semiconductor (complementary metal oxide semiconductor, CMOS), N-type metal oxide semiconductor (NMOS), P-type metal oxide semiconductor (positivechannel metal oxide semiconductor, PMOS), bipolar junction transistor (bipolar junction transistor, BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

The communication apparatus in the above embodiment description may be a network device or a terminal device, but the scope of the communication apparatus described in the present disclosure is not limited thereto, and the structure of the communication apparatus may not be limited by fig. 15. The communication means may be a stand-alone device or may be part of a larger device. For example, the communication device may be:

(1) A stand-alone integrated circuit IC, or chip, or a system-on-a-chip or subsystem;

(2) A set of one or more ICs, optionally including storage means for storing data, a computer program;

(3) An ASIC, such as a Modem (Modem);

(4) Modules that may be embedded within other devices;

(5) A receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handset, a mobile unit, a vehicle-mounted device, a network device, a cloud device, an artificial intelligent device, and the like;

(6) Others, and so on.

For the case where the communication device may be a chip or a chip system, reference may be made to the schematic structural diagram of the chip shown in fig. 16. The chip shown in fig. 16 includes a processor 1601 and an interface 1602. Wherein the number of processors 1601 may be one or more, and the number of interfaces 1602 may be a plurality.

For the case where the chip is used to implement the functions of the terminal device in the embodiments of the present disclosure:

a processor 1601 for performing step 21 in fig. 2; step 32 in fig. 3; step 42 in fig. 4; step 52 in fig. 5, and so on.

An interface 1602 for performing step 31 in fig. 3; step 41 in fig. 4; or step 51 in fig. 5, etc.

For the case where the chip is used to implement the functions of the network device in the embodiments of the present disclosure:

a processor 1601 for performing step 101 in fig. 10; step 112 in fig. 11; or step 122 in fig. 12, etc.

An interface 1602 for performing step 111 in fig. 11; step 121 in fig. 12; step 131 in fig. 13, and so on.

Optionally, the chip further comprises a memory 1603, the memory 1603 being for storing the necessary computer programs and data.

Those of skill in the art will further appreciate that the various illustrative logical blocks (illustrative logical block) and steps (step) described in connection with the embodiments of the disclosure may be implemented by electronic hardware, computer software, or combinations of both. Whether such functionality is implemented as hardware or software depends upon the particular application and design requirements of the overall system. Those skilled in the art may implement the described functionality in varying ways for each particular application, but such implementation is not to be understood as beyond the scope of the embodiments of the present disclosure.

The embodiment of the present disclosure also provides a communication system, which includes the communication apparatus as a terminal device and the communication apparatus as a network device in the embodiment of fig. 14, or includes the communication apparatus as a terminal device and the communication apparatus as a network device in the embodiment of fig. 15.

The present disclosure also provides a computer readable storage medium having instructions stored thereon which, when executed by a computer, perform the functions of any of the method embodiments described above.

The present disclosure also provides a computer program product which, when executed by a computer, performs the functions of any of the method embodiments described above.

In the above embodiments, it may be implemented in whole or in part 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 comprises one or more computer programs. When the computer program is loaded and executed on a computer, the flow or functions described in accordance with the embodiments of the present disclosure are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer program may be stored in or transmitted from one computer readable storage medium to another, for example, by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means from one website, computer, server, or data center. 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, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

Those of ordinary skill in the art will appreciate that: the various numbers of first, second, etc. referred to in this disclosure are merely for ease of description and are not intended to limit the scope of embodiments of this disclosure, nor to indicate sequencing.

At least one of the present disclosure may also be described as one or more, a plurality may be two, three, four or more, and the present disclosure is not limited. In the embodiment of the disclosure, for a technical feature, the technical features in the technical feature are distinguished by "first", "second", "third", "a", "B", "C", and "D", and the technical features described by "first", "second", "third", "a", "B", "C", and "D" are not in sequence or in order of magnitude.

It should be understood that although the terms first, second, third, etc. may be used in embodiments of the present application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, the first information may also be referred to as second information, and similarly, the second information may also be referred to as first information, without departing from the scope of embodiments of the present application. The words "if" and "if" as used herein may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in the … … case".

The correspondence relationships shown in the tables in the present disclosure may be configured or predefined. The values of the information in each table are merely examples, and may be configured as other values, and the present disclosure is not limited thereto. In the case of the correspondence between the configuration information and each parameter, it is not necessarily required to configure all the correspondence shown in each table. For example, in the table in the present disclosure, the correspondence shown by some rows may not be configured. For another example, appropriate morphing adjustments, e.g., splitting, merging, etc., may be made based on the tables described above. The names of the parameters indicated in the tables may be other names which are understood by the communication device, and the values or expressions of the parameters may be other values or expressions which are understood by the communication device. When the tables are implemented, other data structures may be used, for example, an array, a queue, a container, a stack, a linear table, a pointer, a linked list, a tree, a graph, a structure, a class, a heap, a hash table, or a hash table.

Predefined in this disclosure may be understood as defining, predefining, storing, pre-negotiating, pre-configuring, curing, or pre-sintering.

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 solution. 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 disclosure.

It will be further understood that although operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

The foregoing is merely specific embodiments of the disclosure, but the protection scope of the disclosure is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the disclosure, and it is intended to cover the scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A coverage enhancement method for a third message repetition based on four-step random access, the method being performed by a terminal device, the method comprising:

responding to the fact that the current preamble transmission times are larger than a transmission threshold value and the random access RA process meets a preset condition, starting a third message msg3 repeat request mode;

the current preamble transmission times are larger than a transmission threshold value, and are any one of the following:

the preamble transmission times in the two-step 2 step RA process are larger than the maximum transmission times of the rollback of the message A MsgA;

the preamble transmission times in the four-step 4 step RA process are larger than the maximum transmission times of the first message Msg 1;

the preamble transmission times in the four-step 4 step RA process are larger than the maximum transmission times of the backspacing of the Msg 1;

the preamble transmission times in the RA process are larger than the sum of the maximum transmission times of the MsgA and the maximum transmission times of the first message Msg 1;

The preset conditions include any one of the following:

the random access procedure is incomplete and the current RA type is a 4 step RA with a non-2 step RA backoff;

the random access process is incomplete, the current RA type is 4 step RA with non-2 step RA rollbacks, and the received power RSRP of the reference signal of the downlink loss reference point is smaller than a receiving threshold value;

the random access procedure is incomplete, the current RA type is 4 step RA with non-2 step RA backoff, and contention resolution contention resolution fails;

the random access process is incomplete, the current RA type is 4 step RA with non-2 step RA rollbacks, the reference signal received power RSRP of the downlink path loss reference point is smaller than a receiving threshold value, and the contention resolution contention resolution fails;

the random access procedure is incomplete and the current RA type is 4 step RA with 2 step RA backoff;

the random access process is incomplete, the current RA type is 4 step RA with 2 step RA rollbacks, and the reference signal receiving power RSRP of the downlink path loss reference point is smaller than a receiving threshold value;

the random access process is incomplete, the current RA type is 4 step RA with 2 step RA rollbacks, the reference signal received power RSRP of the downlink path loss reference point is smaller than a receiving threshold value, and the contention resolution contention resolution fails;

The random access process is incomplete, and the current RA type is 2 step RA;

the random access procedure is incomplete, the current RA type is 2 step RA, and the received power RSRP of the reference signal of the downlink loss reference point is smaller than the receiving threshold.

2. The method as recited in claim 1, further comprising:

3. The method of claim 2, wherein the capability of the terminal device to support msg3 repetition comprises at least one of:

the terminal equipment supports the capability of msg3 repetition under the condition of backing from 2 step RA to 4 step RA;

4. A coverage enhancement method for a third message repetition based on four-step random access, the method being performed by a network device, the method comprising:

responding to the fact that the preamble transmission times sent by the currently received terminal equipment are larger than a transmission threshold value, and the random access RA process meets preset conditions, determining that the terminal equipment starts a third message msg3 repeated repetition mode;

the preset conditions include any one of the following:

the random access process is incomplete, and the current RA type is 2 step RA;

5. The method as recited in claim 4, further comprising:

6. The method of claim 5, wherein the capability of the terminal device to support msg3 repetition comprises at least one of:

7. A communication apparatus, characterized in that the apparatus is on a terminal device side, the apparatus comprising:

the processing module is used for starting a third message msg3 repeat request mode in response to the fact that the current preamble transmission times are larger than a transmission threshold value and the random access RA process meets preset conditions;

the preset conditions include any one of the following:

the random access process is incomplete, and the current RA type is 2 step RA;

8. The apparatus of claim 7, wherein the apparatus further comprises:

a transceiver module for:

9. The apparatus of claim 8, wherein the capability of the terminal device to support msg3 repetition comprises at least one of:

10. A communication apparatus, the apparatus being on a network device side, the apparatus comprising:

the processing module is used for determining that the terminal equipment starts a third message msg3 repeated repetition mode in response to the fact that the preamble transmission times sent by the currently received terminal equipment are larger than a transmission threshold value and the random access RA process meets preset conditions;

the preset conditions include any one of the following:

the random access process is incomplete, and the current RA type is 2 step RA;

11. The apparatus of claim 10, wherein the apparatus further comprises: a transceiver module for:

12. The apparatus of claim 11, wherein the capability of the terminal device to support msg3 repetition comprises at least one of:

13. A communication device, characterized in that the device comprises a processor and a memory, the memory having stored therein a computer program, the processor executing the computer program stored in the memory to cause the device to perform the method according to any of claims 1 to 3.

14. A communication device, characterized in that the device comprises a processor and a memory, the memory having stored therein a computer program, the processor executing the computer program stored in the memory to cause the device to perform the method according to any of claims 4 to 6.

15. A communication device, comprising: a processor and interface circuit;

the interface circuit is used for receiving code instructions and transmitting the code instructions to the processor;

the processor for executing the code instructions to perform the method of any one of claims 1 to 3.

16. A communication device, comprising: a processor and interface circuit;

the processor for executing the code instructions to perform the method of any one of claims 4 to 6.

17. A computer readable storage medium storing instructions which, when executed, cause the method of any one of claims 1 to 3 to be implemented.

18. A computer readable storage medium storing instructions which, when executed, cause a method as claimed in any one of claims 4 to 6 to be implemented.