CN117596705B - Communication method, terminal, network device, communication system, and storage medium - Google Patents

Abstract

The present disclosure relates to the field of communication technologies, and relates to a communication method, a terminal, a network device, a communication system, and a storage medium. The method executed by the terminal comprises the following steps: determining whether to perform a first operation for an nth random access channel RACH attempt in a random access procedure, the first operation including sending first information to a network device, the first information being used to assist the network device in determining a number of retransmissions of second information, the second information being information sent by the network device to the terminal in the nth RACH attempt procedure, wherein N is a natural number greater than 0; and initiating the Nth RACH attempt, and selecting random access resources to send random access lead codes to the network equipment according to the determined result. By adopting the method, the random access performance can be improved.

Description

Communication method, terminal, network device, communication system and storage medium

Technical Field

The present disclosure relates to the field of communication technology, and in particular to a communication method, a terminal, a network device, a communication system and a storage medium.

Background technique

Both non-terrestrial networks (NTN) and terrestrial networks (TN) have downlink coverage problems. For NTN networks, since the satellite is at a high altitude from the ground, the downlink coverage problem of NTN networks is more serious than that of TN networks, and it is urgent to study the enhancement plan of downlink coverage.

Summary of the invention

The embodiments of the present disclosure provide a communication method, a terminal, a network device, a communication system and a storage medium.

According to a first aspect of an embodiment of the present disclosure, a communication method is proposed, which is executed by a terminal. The method includes:

Determine whether to perform a first operation for an Nth random access channel RACH attempt in a random access process, the first operation comprising sending first information to a network device, the first information being used to assist the network device in determining a number of retransmissions of second information, the second information being information sent by the network device to the terminal during the Nth RACH attempt, wherein N is a natural number greater than 0; initiate the Nth RACH attempt, and select a random access resource according to a determination result to send a random access preamble code to the network device.

According to a second aspect of an embodiment of the present disclosure, a communication method is proposed, which is performed by a network device. The method includes:

A response to a random access preamble sent by a terminal for an Nth RACH attempt in a random access process, wherein the random access preamble is sent by the terminal using a random access resource selected according to a result of determining whether to perform a first operation for the Nth RACH attempt; wherein the first operation includes the terminal sending first information to the network device, the first information being used to assist the network device in determining a number of retransmissions of second information, the second information being information sent by the network device to the terminal during the Nth RACH attempt, wherein N is a natural number greater than 0.

According to a third aspect of an embodiment of the present disclosure, a terminal is provided, including:

a first processing module, configured to determine whether to perform a first operation for an Nth random access channel RACH attempt in a random access process, wherein the first operation includes sending first information to a network device, wherein the first information is used to assist the network device in determining a number of retransmissions of second information, and the second information is information sent by the network device to the terminal during the Nth RACH attempt, wherein N is a natural number greater than 0;

The first transceiver module is used to initiate the Nth RACH attempt, and select a random access resource according to the determination result to send a random access preamble code to the network device.

According to a fourth aspect of an embodiment of the present disclosure, a network device is provided, including:

a second processing module, configured to respond to a random access preamble sent by a terminal for an Nth RACH attempt in a random access process, wherein the random access preamble is sent by the terminal using a random access resource selected according to a result of determining whether to perform a first operation for the Nth RACH attempt; wherein the first operation includes the terminal sending first information to the network device, the first information being used to assist the network device in determining a number of retransmissions of second information, and the second information being information sent by the network device to the terminal during the Nth RACH attempt, wherein N is a natural number greater than 0.

According to the fifth aspect of an embodiment of the present disclosure, a terminal is proposed, comprising: one or more first processors; a first memory coupled to the first processor, wherein executable instructions are stored in the first memory, and when the executable instructions are executed by the first processor, the terminal executes the communication method described in the first aspect.

According to the sixth aspect of an embodiment of the present disclosure, a network device is proposed, comprising: one or more second processors; a second memory coupled to the second processor, wherein the second memory stores executable instructions, and when the executable instructions are executed by the second processor, the network device executes the communication method described in the second aspect.

According to the seventh aspect of an embodiment of the present disclosure, a communication system is proposed, including a terminal and a network device, wherein the terminal is configured to implement the communication method described in the first aspect, and the network device is configured to implement the communication method described in the second aspect.

According to an eighth aspect of an embodiment of the present disclosure, a storage medium is proposed, wherein the storage medium stores instructions, and when the instructions are executed on a communication device, the communication device executes the communication method described in the first aspect or the second aspect.

By adopting the technical solution of the present disclosure, it is possible to determine whether to perform the first operation for each RACH attempt in the RACH process, thereby selecting corresponding RACH resources according to the determination result to assist the network device in improving downlink coverage performance, thereby improving random access performance.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for describing the embodiments are introduced below. The following drawings are only some embodiments of the present disclosure and do not impose specific limitations on the protection scope of the present disclosure.

FIG. 1 is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure.

FIG. 2 is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure.

FIG3 is a flow chart of a communication method according to an embodiment of the present disclosure.

FIG. 4 is a flow chart of a communication method according to an embodiment of the present disclosure.

FIG5 is a flow chart of a communication method according to an embodiment of the present disclosure.

FIG. 6 is a flow chart of a communication method according to an embodiment of the present disclosure.

FIG. 7 is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure.

FIG8 is a flow chart of a communication method according to an embodiment of the present disclosure.

FIG. 9 is a flow chart of a communication method according to an embodiment of the present disclosure.

FIG. 10 is a schematic diagram of the structure of a terminal proposed according to an embodiment of the present disclosure.

FIG. 11 is a schematic diagram of the structure of a network device proposed according to an embodiment of the present disclosure.

FIG. 12 is a schematic diagram of the structure of a communication device proposed according to an embodiment of the present disclosure.

FIG. 13 is a schematic diagram of the structure of a chip proposed according to an embodiment of the present disclosure.

Detailed ways

The embodiments of the present disclosure provide a communication method, a terminal, a network device, a communication system and a storage medium.

In a first aspect, an embodiment of the present disclosure proposes a communication method, which is executed by a terminal, and the method includes: determining whether to perform a first operation for an Nth random access channel RACH attempt in a random access process, the first operation including sending first information to a network device, the first information being used to assist the network device in determining the number of retransmissions of second information, the second information being information sent by the network device to the terminal during the Nth RACH attempt, wherein N is a natural number greater than 0; initiating the Nth RACH attempt, and selecting a random access resource according to the determination result to send a random access preamble code to the network device.

In the above embodiment, the terminal determines whether to perform the first operation for each RACH attempt in the RACH process, and then selects the corresponding RACH resource to send the random access preamble code according to the determination result, which can assist the network device to more accurately determine the number of retransmissions of the second information during the RACH attempt, so as to accurately improve the downlink coverage performance of the network device, thereby improving the performance of random access.

In combination with some embodiments of the first aspect, in some embodiments, the second information includes at least one of the following sent based on a physical downlink control channel PDCCH and/or a physical downlink shared channel PDSCH:

Message Msg 2;

Message Msg 4;

Message Msg B.

In the above embodiments, the technical solution disclosed in the present invention may be used to improve the downlink coverage capability of at least one downlink signal among Msg 2, Msg 4, and Msg B sent via PDCCH and/or PDSCH.

In conjunction with some embodiments of the first aspect, in some embodiments, the first information includes a parameter value of at least one of the following parameter items:

The first parameter item is used to indicate the downlink signal quality;

The second parameter item is used to indicate the number of retransmissions recommended by the terminal;

The third parameter item is used to indicate whether the terminal supports the function of the network device resending the second information.

In the above embodiment, by providing the network device with the downlink signal quality, the number of retransmissions recommended by the terminal, and whether the terminal supports the function of the network device to retransmit the second information, the network device can be assisted to more accurately determine whether to retransmit the second information to the terminal, and the number of retransmissions of the second information, so as to accurately improve the downlink coverage performance of the network device.

In combination with some embodiments of the first aspect, in some embodiments, when it is determined to perform the first operation, the first information is carried in a message Msg 1 or a message Msg A and sent to the network device.

Optionally, determine to perform the first operation, and send the first information to the network device through message Msg 1 or message Msg A.

In some embodiments, the first information may be sent to the network device via Msg 1 or Msg A, which can not only improve the utilization rate of Msg 1 or Msg A, but also avoid additional resource overhead caused by the terminal additionally sending the first information.

In combination with some embodiments of the first aspect, in some embodiments, the access method attempted by the RACH includes at least one of the following:

Contention-based random access (CBRA);

Non-contention random access CFRA;

2-step random access 2-STEP RA;

4-STEP RA.

In the above embodiments, since the technical solution of the present disclosure is applicable to RACH attempts of various access modes, the technical solution of the present disclosure is highly applicable and easy to implement.

In combination with some embodiments of the first aspect, in some embodiments, before determining whether to perform the first operation for the Nth RACH attempt in the random access process, the method includes: determining whether to perform the first operation for each access mode;

The determining whether to perform the first operation for the Nth RACH attempt in the random access process includes: determining the determination result according to the access mode corresponding to the Nth RACH attempt.

In the above embodiment, a judgment method is provided for determining whether to perform the first operation for the RACH attempt according to the access mode corresponding to the RACH attempt.

In conjunction with some embodiments of the first aspect, in some embodiments, the first information including different parameter values corresponds to different random access resources;

The initiating the Nth RACH attempt and selecting a random access resource according to a determination result to send a random access preamble to the network device includes: determining a corresponding random access resource according to a parameter value in the first information and sending a random access preamble.

In the above embodiment, by setting the first information including different parameter values to correspond to different random access resources, the network device can distinguish the first information including different contents based on different random access resources, thereby improving the access efficiency of RACH attempts.

In combination with some embodiments of the first aspect, in some embodiments, determining whether to perform the first operation for the Nth RACH attempt in the random access process includes: determining whether to perform the first operation for the first RACH attempt in the random access initialization phase.

In the above embodiment, it is specified that whether to perform the first operation for the first RACH attempt can be determined in the random access initialization phase.

In combination with some embodiments of the first aspect, in some embodiments, the determining whether to perform the first operation for the Nth RACH attempt in the random access process includes: determining whether to perform the first operation for a RACH attempt other than the first time in the random access initialization phase.

In the above embodiment, it is specified that whether to perform the first operation for a non-first RACH attempt can be determined in the random access initialization phase.

In combination with some embodiments of the first aspect, in some embodiments, the method further includes: determining to perform the first operation, and determining a parameter value in the first information in a random access initialization phase.

In the above embodiment, it is specified that when determining to perform the first operation for the first/non-first RACH attempt in the random access initialization phase, the content of the first information corresponding to the first/non-first RACH attempt can be determined in the random access initialization phase.

In combination with some embodiments of the first aspect, in some embodiments, the determining whether to perform the first operation for the Nth RACH attempt in the random access process includes: for a non-first RACH attempt, before initiating the non-first RACH attempt, determining whether to perform the first operation for the non-first RACH attempt.

In the above embodiment, for a non-first RACH attempt, it may also be determined whether to perform the first operation for the non-first RACH attempt before initiating the non-first RACH attempt.

In conjunction with some embodiments of the first aspect, in some embodiments, the first operation further includes updating the first information;

The determining whether to perform the first operation for the non-first RACH attempt includes: determining whether to update a parameter value in the first information for the non-first RACH attempt.

In the above embodiment, it is specified that the first operation may include updating the first information. Accordingly, the implementation of determining whether to perform the first operation for a non-first RACH attempt may include: determining whether to update a parameter value in the first information for a non-first RACH attempt.

In conjunction with some embodiments of the first aspect, in some embodiments, before determining whether to perform the first operation for the non-first RACH attempt, the method includes:

Determining that a first condition is satisfied, the first condition comprising at least one of the following:

The access mode of the RACH attempt is switched from CFRA to CBRA;

The access mode of RACH attempt is switched from 2-STEP RA to 4-STEP RA;

The number of RACH attempts reaches a first specified number;

The number of retransmissions of message Msg 1 has changed.

In the above embodiment, it is provided that the determination of whether to perform the first operation for a non-first RACH attempt can be triggered at multiple occasions, thereby expanding the application occasions of the solution.

In combination with some embodiments of the first aspect, in some embodiments, determining whether to update the parameter value in the first information for the non-first RACH attempt includes: updating the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt, wherein the number of retransmissions recommended by the terminal in the updated first information is greater than the number of retransmissions recommended by the terminal in the first information sent last time, and/or the number of retransmissions recommended by the terminal in the updated first information is greater than the number of retransmissions recommended by the terminal during the last RACH attempt of the non-first RACH attempt.

In the above embodiment, when updating the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt, the number of retransmissions recommended by the terminal in the updated first information can be made greater than the number of retransmissions recommended by the terminal in the first information sent last time, and/or, the number of retransmissions recommended by the terminal in the updated first information can be made greater than the actual number of retransmissions of the second information during the last RACH attempt of the non-first RACH attempt, so as to improve the access success rate of the non-first RACH attempt and improve the performance of random access.

In combination with some embodiments of the first aspect, in some embodiments, before the updating of the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt, the method includes: receiving third information sent by the network device, where the third information is used to configure a candidate retransmission number sequence; determining from the candidate retransmission number sequence a minimum candidate retransmission number that is greater than the number of retransmissions recommended by the terminal in the first information sent last time;

The updating the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt includes: updating the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt according to the minimum candidate retransmission number.

In the above embodiment, the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt can be updated according to the candidate retransmission number sequence configured by the network device to improve the access success rate of the non-first RACH attempt and improve the performance of random access.

In combination with some embodiments of the first aspect, in some embodiments, the third information is any one of the following:

System information block SIB 1;

SIB 19;

Radio Resource Control RRC reconfiguration message.

In the above embodiment, it is specified that the network device can configure the candidate retransmission number sequence to the terminal through at least one of SIB 1, SIB 19, and RRC reconfiguration message.

In combination with some embodiments of the first aspect, in some embodiments, before the updating of the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt, the method includes:

receiving fourth information sent by the network device; determining, according to the fourth information, the number of retransmissions of the second information during the last RACH attempt that is not the first RACH attempt;

The updating of the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt includes: updating the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt according to a value greater than the number of retransmissions in the second information.

In the above embodiment, the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt can be determined according to the actual number of retransmissions of the second information during the previous RACH attempt of the non-first RACH attempt, so as to improve the access success rate of the non-first RACH attempt and improve the performance of random access.

In combination with some embodiments of the first aspect, in some embodiments, the fourth information is any one of the following:

SIB 1;

SIB 19;

RRC reconfiguration message.

In the above embodiment, it is specified that the network device can send the actual number of retransmissions of the second information in the last RACH attempt process to the terminal through at least one of SIB 1, SIB 19, and RRC reconfiguration message.

In combination with some embodiments of the first aspect, in some embodiments, before updating the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt, it includes: determining that the number of retransmissions recommended by the terminal in the first information sent last time is less than a second specified number.

In the above embodiment, the upper limit of the number of retransmission times recommended by the terminal in the first information is regulated.

In a second aspect, an embodiment of the present disclosure proposes a communication method, which is executed by a network device, and the method includes: responding to a random access preamble sent by a terminal for an Nth RACH attempt in a random access process, wherein the random access preamble is sent by the terminal using a random access resource selected based on a result of determining whether to perform a first operation for the Nth RACH attempt; wherein the first operation includes the terminal sending first information to the network device, the first information being used to assist the network device in determining a number of retransmissions of second information, and the second information being information sent by the network device to the terminal during the Nth RACH attempt, wherein N is a natural number greater than 0.

In a third aspect, an embodiment of the present disclosure proposes a terminal, which includes at least one of a first transceiver module and a first processing module; wherein the terminal is used to execute an optional implementation method of the first aspect.

In a fourth aspect, an embodiment of the present disclosure proposes a network device, which includes at least one of a second transceiver module and a second processing module; wherein the network device is used to execute the optional implementation method of the second aspect.

In a fifth aspect, an embodiment of the present disclosure proposes a terminal, comprising: one or more first processors; a first memory coupled to the first processor, wherein executable instructions are stored in the first memory, and when the executable instructions are executed by the first processor, the terminal executes the communication method described in any one of the first aspects.

In a sixth aspect, an embodiment of the present disclosure proposes a network device, comprising: one or more second processors; a second memory coupled to the second processor, wherein the second memory stores executable instructions, and when the executable instructions are executed by the second processor, the network device executes the communication method described in the second aspect.

In the seventh aspect, an embodiment of the present disclosure proposes a communication system, which includes: a terminal, and a network device, wherein the terminal is configured to execute the method described in the optional implementation manner of the first aspect, and the network device is configured to execute the method described in the optional implementation manner of the second aspect.

In an eighth aspect, an embodiment of the present disclosure proposes a storage medium, wherein the storage medium stores instructions. When the instructions are executed on a communication device, the communication device executes the method described in the first aspect and the optional implementation of the second aspect.

In a ninth aspect, an embodiment of the present disclosure proposes a program product. When the program product is executed by a communication device, the communication device executes the method described in the first aspect and the optional implementation manner of the second aspect.

In a tenth aspect, an embodiment of the present disclosure proposes a computer program, which, when executed on a computer, enables the computer to execute the method described in the first aspect and the optional implementation of the second aspect.

In an eleventh aspect, an embodiment of the present disclosure provides a chip or a chip system, which includes a processing circuit configured to execute the method described in the first aspect and the optional implementation of the second aspect.

It is understandable that the above-mentioned terminals, network devices, communication systems, storage media, program products, computer programs, chips or chip systems are all used to execute the methods proposed in the embodiments of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods, which will not be repeated here.

The embodiments of the present disclosure provide a communication method, a terminal, a network device, a communication system, and a storage medium. In some embodiments, the terms such as the communication method, the information processing method, the method for determining whether to reselect RACH resources for each random access attempt, etc. can be replaced with each other, and the terms such as the communication system, the information processing system, the system for determining whether to reselect RACH resources for each random access attempt, etc. can be replaced with each other.

The embodiments of the present disclosure are not exhaustive, but are only illustrative of some embodiments, and are not intended to be a specific limitation on the scope of protection of the present disclosure. In the absence of contradiction, each step in a certain embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a certain embodiment can also be implemented as an independent embodiment, and the order of the steps in a certain embodiment can be arbitrarily exchanged. In addition, the optional implementation methods in a certain embodiment can be arbitrarily combined; in addition, the embodiments can be arbitrarily combined, for example, some or all steps of different embodiments can be arbitrarily combined, and a certain embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

In each embodiment of the present disclosure, unless otherwise specified or there is a logical conflict, the terms and/or descriptions between the embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form a new embodiment based on their internal logical relationships.

The terms used in the embodiments of the present disclosure are only for the purpose of describing the specific embodiments and are not intended to limit the present disclosure.

In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular form, such as "a", "an", "the", "above", "said", "aforementioned", "this", etc., may mean "one and only one", or "one or more", "at least one", etc. For example, when using articles such as "a", "an", "the" in English in translation, the noun after the article may be understood as a singular expression or a plural expression.

In the embodiments of the present disclosure, “plurality” refers to two or more.

In some embodiments, the terms “at least one,” “one or more,” “a plurality of,” “multiple,” etc. may be used interchangeably.

In some embodiments, "at least one of A and B", "A and/or B", "A in one case, B in another case", "in response to one case A, in response to another case B", etc., may include the following technical solutions according to the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); in some embodiments, A and B (A and B are both executed). When there are more branches such as A, B, C, etc., the above is also similar.

In some embodiments, the recording method of "A or B" may include the following technical solutions according to the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). When there are more branches such as A, B, C, etc., the above is also similar.

The prefixes such as "first" and "second" in the embodiments of the present disclosure are only used to distinguish different description objects, and do not constitute restrictions on the position, order, priority, quantity or content of the description objects. The statement of the description object refers to the description in the context of the claims or embodiments, and should not constitute redundant restrictions due to the use of prefixes. For example, if the description object is a "field", the ordinal number before the "field" in the "first field" and the "second field" does not limit the position or order between the "fields", and the "first" and "second" do not limit whether the "fields" they modify are in the same message, nor do they limit the order of the "first field" and the "second field". For another example, if the description object is a "level", the ordinal number before the "level" in the "first level" and the "second level" does not limit the priority between the "levels". For another example, the number of description objects is not limited by the ordinal number, and can be one or more. Taking the "first device" as an example, the number of "devices" can be one or more. In addition, the objects modified by different prefixes may be the same or different. For example, if the description object is "device", then the "first device" and the "second device" may be the same device or different devices, and their types may be the same or different. For another example, if the description object is "information", then the "first information" and the "second information" may be the same information or different information, and their contents may be the same or different.

In some embodiments, “including A”, “comprising A”, “used to indicate A”, and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

In some embodiments, terms such as “time/frequency”, “time/frequency domain”, and the like refer to the time domain and/or the frequency domain.

In some embodiments, terms such as "in response to ...", "in response to determining ...", "in the case of ...", "at ...", "when ...", "if ...", "if ...", etc. can be used interchangeably.

In some embodiments, terms such as "greater than", "greater than or equal to", "not less than", "more than", "more than or equal to", "not less than", "higher than", "higher than or equal to", "not lower than", and "above" can be replaced with each other, and terms such as "less than", "less than or equal to", "not greater than", "less than", "less than or equal to", "no more than", "lower than", "lower than or equal to", "not higher than", and "below" can be replaced with each other.

In some embodiments, devices, etc. can be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. Terms such as "device", "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", and "subject" can be used interchangeably.

In some embodiments, "network" may be interpreted as devices included in the network (eg, access network equipment, core network equipment, etc.).

In some embodiments, the terms "access network device (AN device)", "radio access network device (RAN device)", "base station (BS)", "radio base station (radio base station)", "fixed station (fixed station)", "node (node)", "access point (access point)", "transmission point (TP)", "reception point (reception point, RP)", "transmission and/or reception point (transmission / reception point, TRP)", "panel (panel)", "antenna panel (antenna panel)", "antenna array (antenna array)", "cell (cell)", "macro cell (macro cell)", "small cell (small cell)", "femto cell (femto cell)", "pico cell (pico cell)", "sector (sector)", "cell group (cell)", "serving cell (serving cell)", "carrier (carrier)", "component carrier (component carrier)", "bandwidth part (bandwidth part, BWP)" and the like can be used interchangeably.

In some embodiments, the terms "terminal", "terminal device", "user equipment (UE)", "user terminal" "mobile station (MS)", "mobile terminal (MT)", subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client and the like can be used interchangeably.

In some embodiments, the access network device, the core network device, or the network device can be replaced by a terminal. For example, the various embodiments of the present disclosure can also be applied to a structure in which the communication between the access network device, the core network device, or the network device and the terminal is replaced by the communication between multiple terminals (for example, device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, it can also be set as a structure in which the terminal has all or part of the functions of the access network device. In addition, terms such as "uplink" and "downlink" can also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can be replaced by side channels, and uplinks, downlinks, etc. can be replaced by side links.

In some embodiments, the terminal may be replaced by an access network device, a core network device, or a network device. In this case, the access network device, the core network device, or the network device may also be configured to have a structure that has all or part of the functions of the terminal.

In some embodiments, acquisition of data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

In some embodiments, data, information, etc. may be obtained with the user's consent.

In addition, each element, each row, or each column in the table of the embodiments of the present disclosure may be implemented as an independent embodiment, and the combination of any elements, any rows, or any columns may also be implemented as an independent embodiment.

Although the operations are described in a specific order in the accompanying drawings in the disclosed embodiments, it should not be understood that it is required to perform these operations in the specific order shown or in a serial order, or to perform all the operations shown to obtain the desired results. In certain environments, multitasking and parallel processing may be advantageous. In addition, sending multiple information through the same message is also advantageous.

FIG1 is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure. As shown in FIG1 , the communication system 100 may include a terminal 101 and a network device 102 .

In some embodiments, the terminal 101 includes, for example, a mobile phone, a wearable device, an Internet of Things device, a car with communication function, a smart car, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, and at least one of a wireless terminal device in a smart home, but is not limited thereto.

In some embodiments, the network device 102 may include at least one of an access network device and a core network device.

Optionally, the access network device is, for example, a node or device that accesses a terminal to a wireless network. The access network device may include an evolved NodeB (eNB), a next generation evolved NodeB (ng-eNB), a next generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved node B (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an open base station (Open RAN), a cloud base station (CloudRAN), a base station in other communication systems, and at least one of an access node in a Wi-Fi system, but is not limited thereto.

In some embodiments, the network device 102 is a base station. Optionally, the base station is, for example, a macro base station, a micro base station (also called a small station), a relay station, an access point, a 5G base station or a future base station, a satellite, a transmission point (Transmitting and Receiving Point, TRP), a transmitting point (Transmitting Point, TP), a mobile switching center, or other devices that assume the function of a base station in a communication system, etc., which are not specifically limited in the embodiments of the present disclosure. For the convenience of description, in all embodiments of the present disclosure, the devices that provide wireless communication functions for terminal devices are collectively referred to as network devices or base stations.

In some embodiments, the network device 102 is a core network device. The core network device may be a device including a first network element, a second network element, etc., or may be a plurality of devices or a group of devices, including all or part of the first network element, the second network element, etc. The network element may be virtual or physical. The core network may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

In some embodiments, the technical solution of the present disclosure may be applicable to the Open RAN architecture. In this case, the interfaces between or within the access network devices involved in the embodiments of the present disclosure may become internal interfaces of the Open RAN, and the processes and information interactions between these internal interfaces may be implemented through software or programs.

In some embodiments, the access network device may be composed of a centralized unit (central unit, CU) and a distributed unit (distributed unit, DU), wherein the CU may also be referred to as a control unit (control unit). The CU-DU structure may be used to split the protocol layer of the access network device, with some functions of the protocol layer being centrally controlled by the CU, and the remaining part or all of the functions of the protocol layer being distributed in the DU, and the DU being centrally controlled by the CU, but not limited to this.

It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution proposed in the embodiment of the present disclosure. A person skilled in the art can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution proposed in the embodiment of the present disclosure is also applicable to similar technical problems.

The following embodiments of the present disclosure may be applied to the communication system 100 shown in FIG1 , or part of the subject, but are not limited thereto. The subjects shown in FIG1 are examples, and the communication system may include all or part of the subjects in FIG1 , or may include other subjects other than FIG1 , and the number and form of the subjects are arbitrary, and the subjects may be physical or virtual, and the connection relationship between the subjects is an example, and the subjects may be connected or disconnected, and the connection may be in any manner, and may be a direct connection or an indirect connection, and may be a wired connection or a wireless connection.

Embodiments of the present disclosure may be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G New Radio (NR), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), Public Land Mobile Network (PLMN) network, Device-to-Device (D2D) system, Machine-to-Machine (M2M) system, Internet of Things (IoT) system, Vehicle-to-Everything (V2X), systems using other communication methods, and next-generation systems based on them. In addition, multiple systems can be combined (for example, a combination of LTE or LTE-A and 5G, etc.) for application.

In some embodiments, for NTN networks, due to the high altitude of satellites above the ground, the downlink coverage problem is more serious than that of TN networks, and it is necessary to study the enhancement scheme of downlink coverage. As one of the downlink messages, Msg2/MsgB/Msg4 of random access also has coverage problems in some scenarios. Therefore, it is necessary to study how to improve the downlink coverage of these messages to improve the performance of random access.

In some embodiments, in order to improve the downlink coverage of Msg2/Msg4/MsgB, the downlink coverage performance may be improved by repetition of Msg2/Msg4/MsgB. In order for the network to determine the number of repetitions of Msg2/Msg4/MsgB, the UE needs to report auxiliary information to assist the network in determining the repetition.

In some embodiments, the auxiliary information may be one or more of the following:

Downlink signal quality, such as Channel Quality Indicator (CQI) or Reference Signal Received Power (RSRP);

The recommended number of repetitions;

Whether the UE supports Msg2/Msg4/MsgB repetition.

In some embodiments, NR supports configuring different physical random access channel (PRACH) resources for different feature combinations. Featurecombination supports the following feature combinations:

Msg3 repetition;

Msg1 repetition;

RedCap (Reduced capability), which refers to a 5G technology defined by the 3rd Generation Partnership Project (3GPP) standardization organization, also known as lightweight 5G;

Small Data;

Slice NSAG.

In some embodiments, during a random access process, after a random access attempt (i.e., random access channel attempt/RACH attempt) fails, the terminal needs to make another random access attempt again until the maximum number of random access attempts is reached. When making different random access attempts, the terminal may switch between contention-based random access (CBRA: Contention Based Random Access) and non-contention-based random access (CFRA: Contention Free Random Access), or switch from 2-STEP RA to 4 STEP RA, or change the number of Msg1repetitions.

In some embodiments, for the RACH process of Msg2/MsgB/Msg4 repetition, whether each RACH repetition reselects random access resources has not been discussed. In view of this, the present disclosure provides a communication method, a terminal, a network device, a communication system and a storage medium to determine whether each random access attempt reselects RACH resources for a scenario supporting Msg2/MsgB/Msg4 repetition.

Fig. 2 is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure. As shown in Fig. 2, the embodiment of the present disclosure relates to a communication method, and the method includes:

Step S201: Terminal 101 determines to perform a first operation for a first RACH attempt in a random access procedure.

In some embodiments, the first operation corresponding to the first RACH attempt includes the terminal sending the first information to the network device and/or updating the first information. The name of the first operation is not limited, and it is, for example, a specific operation, an operation of sending information, an operation of updating information, etc. Updating the first information may refer to updating the content of the first information, such as default content, initial content, etc., to obtain the first information corresponding to the first RACH attempt.

In some embodiments, the first information is used to assist the network device in determining the number of retransmissions of the second information. For example, the first information corresponding to the first RACH attempt is used to assist the network device in determining the number of retransmissions of the second information during the first RACH attempt, wherein the second information is information sent by the network device to the terminal during the first RACH attempt.

In some embodiments, the name of the first information is not limited, and it is, for example, auxiliary information.

In some embodiments, the name of the second information is not limited. Optionally, the second information is any one of Msg 2, Msg 4, and Msg B sent based on PDCCH or PDSCH.

In some embodiments, before step S201, terminal 101 may determine whether to perform a first operation for the first RACH attempt.

Optionally, before the terminal 101 determines whether to perform the first operation for the first RACH attempt, it includes: determining whether to perform the first operation for each access mode. Accordingly, the implementation method of the terminal 101 determining whether to perform the first operation for the first RACH attempt may be: determining whether to perform the first operation for the first RACH attempt according to the access mode corresponding to the first RACH attempt.

In some embodiments, the access mode attempted by the RACH includes but is not limited to CBRA, CFRA, 2-STEP RA, and 4-STEP RA. Optionally, the correspondence between each access mode and whether to perform the first operation can be indicated to the terminal through a network device. Optionally, the correspondence between each access mode and whether to perform the first operation can be pre-stored in the terminal. Optionally, the correspondence between each access mode and whether to perform the first operation is a default relationship.

It should be explained that 4-STEP RA involves Msg 1, Msg 2, Msg 3, and Msg 4. Msg 1 is the message sent by the terminal to the network device in the first step. Msg 2 is the message sent by the network device to the terminal in the second step. Msg 3 is the message sent by the terminal to the network device in the third step. Msg 4 is the message sent by the network device to the terminal in the fourth step.

2-STEP RA involves Msg A and Msg B. Msg A is the message sent by the terminal to the network device in the first step. Msg B is the message sent by the network device to the terminal in the second step.

It should be noted that, in some embodiments, a random access process includes a random access initialization phase and at least one RACH attempt. Optionally, the terminal 101 determines whether to perform the first operation for the first RACH attempt in the random access initialization phase. Optionally, the terminal 101 determines whether to perform the first operation for the first RACH attempt before initiating the first RACH attempt.

In some embodiments, determining whether to perform the first operation for the first RACH attempt includes: determining whether to update a parameter value in the first information for the first RACH attempt. For example, determining whether to update a default parameter item and a default parameter value in the first information to obtain the first information corresponding to the current RACH attempt.

In some embodiments, the implementation of determining whether to perform a first operation for a first RACH attempt includes:

For the first RACH attempt, it is determined whether to send first information.

Step S202: Terminal 101 determines first information corresponding to the first RACH attempt.

In some embodiments, the first information corresponding to the first RACH attempt includes a parameter value of at least one of the following parameter items:

The first parameter item is used to indicate the downlink signal quality;

The second parameter item is used to indicate the number of retransmissions recommended by the terminal 101;

The third parameter item is used to indicate whether the terminal 101 supports the function of the network device 102 to resend the second information.

The quality of the downlink signal can be confirmed by CQI and/or RSRPR.

In some embodiments, if the terminal 101 determines to perform the first operation for the first RACH attempt in the random access initialization phase, the terminal 101 determines the parameter items in the first information corresponding to the first RACH attempt and the parameter value of each parameter item in the random access initialization phase.

In some embodiments, if the terminal 101 determines to perform the first operation for the first RACH attempt before initiating the first RACH attempt, then the terminal 101 determines the parameter items in the first information corresponding to the first RACH attempt and the parameter value of each parameter item before initiating the first RACH attempt.

Step S203 : the terminal 101 initiates a first RACH attempt, and selects a random access resource to send a random access preamble to the network device 102 according to a result of performing the first operation on the first RACH attempt.

In some embodiments, the network device 102 receives a random access preamble.

In some embodiments, the random access resource includes at least one of a time domain resource, a frequency domain resource, and a code domain resource. The random access preamble is a code domain resource.

In some embodiments, the first information including different parameter values corresponds to different random access resources. That is, updating the content of the first information means updating the random access resources.

Optionally, the terminal 101 initiates a first RACH attempt, and selects a random access resource to send a random access preamble code to the network device 102 according to a determination result of performing a first operation on the first RACH attempt, including: determining the corresponding random access resource according to the content of the first information corresponding to the first RACH attempt, and sending the random access preamble code in the random access resource according to the time domain information and/or frequency domain information in the random access resource.

In some embodiments, if the access mode of the first RACH attempt is 4-STEP RA, the random access preamble may also be referred to as Msg 1. In some embodiments, the first information is carried in Msg 1 and sent to the network device.

In some embodiments, if the access mode of the first RACH attempt is 2-STEP RA, a random access preamble code and the first information may be sent to the network device via Msg A.

Step S204 : the network device 102 determines the number of retransmissions of the second information during the first RACH attempt according to the first information corresponding to the first RACH attempt, and responds to the terminal 101 .

The network device 102 responding to the terminal 101 may include sending the second information to the terminal 101 once or multiple times.

In some embodiments, step S203 may be replaced by the terminal 101 initiating a first RACH attempt, and selecting a random access resource according to the result of the determination that the first operation is not performed for the first RACH attempt to send a random access preamble to the network device 102. Accordingly, step S204 may be replaced by the network device 102 responding to the terminal 101. The network device 102 responding to the terminal 101 may include sending the second information to the terminal 101 once, that is, the second information is not retransmitted.

If the first RACH attempt fails, a second RACH attempt and a third RACH attempt are performed according to the following steps S205 to S208 until random access is successful or until the number of RACH attempts reaches an upper limit. That is, the non-first RACH attempt in the following steps S205 to S208 may refer to any RACH attempt other than the first RACH attempt.

Step S205: The terminal 101 determines to perform a first operation for a non-first RACH attempt.

In some embodiments, the first operation corresponding to the non-first RACH attempt includes the terminal sending the first information to the network device and/or updating the first information. The name of the first operation is not limited, and it is, for example, a specific operation, an operation of sending information, an operation of updating information, etc. Updating the first information may refer to updating the first information corresponding to the last RACH attempt or the content of the first information used last time to obtain the first information corresponding to this RACH attempt.

In some embodiments, the first information is used to assist the network device in determining the number of retransmissions of the second information. For example, the first information corresponding to the non-first RACH attempt is used to assist the network device in determining the number of retransmissions of the second information during the non-first RACH attempt, wherein the second information is information sent by the network device to the terminal during the non-first RACH attempt.

In some embodiments, the name of the first information is not limited, and it is, for example, auxiliary information.

In some embodiments, the name of the second information is not limited. Optionally, the second information is any one of Msg 2, Msg 4, and Msg B sent based on PDCCH or PDSCH.

In some embodiments, before step S205, the terminal 101 may determine whether to perform the first operation for a non-first RACH attempt.

Optionally, before the terminal 101 determines whether to perform the first operation for the non-first RACH attempt, it includes: determining whether to perform the first operation for each access mode. Accordingly, the implementation method of the terminal 101 determining whether to perform the first operation for the non-first RACH attempt may be: determining whether to perform the first operation for the non-first RACH attempt according to the access mode corresponding to the non-first RACH attempt.

In some embodiments, the access mode attempted by the RACH includes but is not limited to CBRA, CFRA, 2-STEP RA, and 4-STEP RA. Optionally, the correspondence between each access mode and whether to perform the first operation can be indicated to the terminal through a network device. Optionally, the correspondence between each access mode and whether to perform the first operation can be pre-stored in the terminal. Optionally, the correspondence between each access mode and whether to perform the first operation is a default relationship.

It should be noted that, in some embodiments, a random access process includes a random access initialization phase and at least one RACH attempt. Optionally, the terminal 101 determines whether to perform the first operation for a non-first RACH attempt during the random access initialization phase. Optionally, the terminal 101 determines whether to perform the first operation for the non-first RACH attempt before initiating the non-first RACH attempt.

In some embodiments, the terminal determines whether to perform the first operation for a non-first RACH attempt when a first condition is met. The first condition includes at least one of the following:

The access mode of the RACH attempt is switched from CFRA to CBRA, that is, the access mode of the previous RACH attempt is CFRA, and the access mode of this RACH attempt is CBRA;

The access mode of the RACH attempt is switched from 2-STEP RA to 4-STEP RA, that is, the access mode of the previous RACH attempt is 2-STEP RA, and the access mode of this RACH attempt is 4-STEP RA;

The number of RACH attempts reaches a first specified number;

The number of resends of message Msg 1 has changed;

The number of retransmissions recommended by the terminal in the last sent first information is less than the second specified number.

In some embodiments, the implementation of determining whether to perform the first operation for a non-first RACH attempt includes: determining whether to update a parameter value in the first information for a non-first RACH attempt. For example, determining whether to update a parameter item and a parameter value in the first information corresponding to the last RACH attempt to obtain the first information corresponding to the current RACH attempt. For example, determining whether to update a parameter item and a parameter value in the first information used last time to obtain the first information corresponding to the current RACH attempt.

In some embodiments, the implementation of determining whether to perform the first operation for a non-first RACH attempt includes:

For a non-first RACH attempt, determining whether to send first information.

Step S206: The terminal 101 determines first information corresponding to a non-first RACH attempt.

In some embodiments, the first information corresponding to the non-first RACH attempt includes a parameter value of at least one of the following parameter items:

The first parameter item is used to indicate the downlink signal quality;

The second parameter item is used to indicate the number of retransmissions recommended by the terminal 101;

The third parameter item is used to indicate whether the terminal 101 supports the function of the network device 102 to resend the second information.

The quality of the downlink signal can be confirmed by CQI and/or RSRPR.

In some embodiments, if the terminal 101 determines to perform the first operation for a non-first RACH attempt during the random access initialization phase, the terminal 101 determines parameter items in the first information corresponding to the non-first RACH attempt and parameter values of each parameter item during the random access initialization phase.

In some embodiments, if the terminal 101 determines to perform the first operation for a non-first RACH attempt before initiating the non-first RACH attempt, then the terminal 101 determines the parameter items in the first information corresponding to the non-first RACH attempt and the parameter value of each parameter item before initiating the non-first RACH attempt.

In some embodiments, if it is determined to update the number of retransmissions recommended by the terminal in the first information corresponding to a non-first RACH attempt, the number of retransmissions recommended by the terminal in the updated first information can be made greater than the number of retransmissions recommended by the terminal in the first information sent last time, and/or the number of retransmissions recommended by the terminal in the updated first information can be made greater than the number of retransmissions of the second information during the last RACH attempt.

In some implementations, before updating the number of retransmissions recommended by the terminal in the first information corresponding to a non-first RACH attempt, the method includes: the terminal 101 receives the third information sent by the network device 102, and determines a candidate retransmission number sequence based on the third information. The terminal 101 determines the minimum candidate retransmission number from the candidate retransmission number sequence that is greater than the number of retransmissions recommended by the terminal in the first information sent last time. Accordingly, the implementation method of the terminal 101 updating the number of retransmissions recommended by the terminal in the first information corresponding to a non-first RACH attempt includes: updating the number of retransmissions recommended by the terminal in the first information corresponding to a non-first RACH attempt based on the minimum candidate retransmission number, and after the update, the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt is the minimum candidate retransmission number.

In some embodiments, the third information is SIB 1, SIB 19, or an RRC reconfiguration message.

In some embodiments, before updating the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt, it includes: the terminal 101 receives the fourth information sent by the network device, and determines the number of retransmissions of the second information in the process of the last RACH attempt of the non-first RACH attempt according to the fourth information. Among them, the fourth message is SIB 1, SIB 19, or RRC reconfiguration message. Accordingly, the implementation method of the terminal 101 updating the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt includes: updating the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt according to a value greater than the number of retransmissions of the second information in the process of the last RACH attempt, and after the update, the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt is a value greater than the number of retransmissions of the second information in the process of the last RACH attempt.

Step S207 : the terminal 101 initiates a non-first RACH attempt, and selects a random access resource to send a random access preamble to the network device 102 according to a determination result of performing the first operation on the non-first RACH attempt.

In some embodiments, the network device 102 receives a random access preamble.

In some embodiments, the random access resource includes at least one of a time domain resource, a frequency domain resource, and a code domain resource. The random access preamble is a code domain resource.

In some embodiments, the first information including different parameter values corresponds to different random access resources.

Optionally, the terminal 101 initiates a non-first RACH attempt, and selects a random access resource to send a random access preamble code to the network device 102 according to the determination result of performing the first operation on the non-first RACH attempt, including: determining the corresponding random access resource according to the content of the first information corresponding to the non-first RACH attempt, and sending the random access preamble code in the random access resource according to the time domain information and/or frequency domain information in the random access resource.

In some embodiments, if the access mode other than the first RACH attempt is 4-STEP RA, the random access preamble may also be referred to as Msg 1. In some embodiments, the first information is carried in Msg 1 and sent to the network device.

In some embodiments, if the access mode other than the first RACH attempt is 2-STEP RA, the random access preamble and the first information may be sent to the network device via MsgA.

Step S208 : the network device 102 determines the number of retransmissions of the second information in the non-first RACH attempt according to the first information corresponding to the non-first RACH attempt, and responds to the terminal 101 .

The network device 102 responding to the terminal 101 may include sending the second information to the terminal 101 once or multiple times.

In some embodiments, step S207 may be replaced by the terminal 101 initiating a non-first RACH attempt, and selecting a random access resource according to the determination result that the first operation is not performed for the non-first RACH attempt to send a random access preamble to the network device 102. Accordingly, step S208 may be replaced by the network device 102 responding to the terminal 101. The network device 102 responding to the terminal 101 may include sending the second information to the terminal 101 once, that is, the second information is not retransmitted.

In some embodiments, the names of information, etc. are not limited to the names recorded in the embodiments, and terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "symbol", "codeword", "codebook", "codeword", "codepoint", "bit", "data", "program", and "chip" can be used interchangeably.

In some embodiments, the terms "downlink", "downlink", "physical downlink", etc. can be used interchangeably.

In some embodiments, the terms "random access attempt", "random access channel attempt", "RACH attempt", etc. may be used interchangeably.

In some embodiments, the terms "physical downlink shared channel (PDSCH)", "DL data", "physical downlink control channel PDCCH" and the like may be used interchangeably.

In some embodiments, "obtain", "obtain", "get", "receive", "transmit", "bidirectional transmission", "send and/or receive" can be interchangeable, which can be interpreted as receiving from other entities, obtaining from protocols, obtaining from high levels, obtaining by self-processing, autonomous implementation, etc.

In some embodiments, terms such as "send", "transmit", "report", "send", "transmit", "bidirectional transmission", "send and/or receive" can be used interchangeably.

In some embodiments, terms such as "certain", "preset", "preset", "set", "indicated", "some", "any", and "first" can be interchangeable, and "specific A", "preset A", "preset A", "set A", "indicated A", "some A", "any A", and "first A" can be interpreted as A pre-defined in a protocol, etc., or as A obtained through setting, configuration, or indication, etc., and can also be interpreted as specific A, some A, any A, or first A, etc., but is not limited to this.

In some embodiments, the determination or judgment may be performed by a value represented by 1 bit such as 0 or 1, or by a true or false value represented by true or false such as a Boolean value, or by comparison of numerical values, for example, comparison with a predetermined value, but is not limited thereto.

The communication method involved in the embodiment of the present disclosure may include at least one of step S201 to step S208. For example, step S203 may be implemented as an independent embodiment, step S207 may be implemented as an independent embodiment, step S203 and step S204 may be implemented as independent embodiments, and step S207 and step S208 may be implemented as independent embodiments, but are not limited thereto.

In some embodiments, step S201 and step S202 may be executed in an exchanged order or simultaneously, and step S205 and step S206 may be executed in an exchanged order or simultaneously.

In some embodiments, step S201, step S202, and step S204 to step S208 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

In some embodiments, step S201 to step S206 and step S208 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

In some embodiments, reference may be made to other optional implementations recorded before or after the description corresponding to FIG. 2 .

FIG3 is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG3, the present disclosure embodiment relates to a communication method, which is executed by a terminal side, and the method includes:

Step S301: determine whether to perform a first operation for a first RACH attempt in a random access procedure.

The optional implementation of step S301 can refer to the optional implementation of step S201 in FIG. 2 and other related parts in the embodiment involved in FIG. 2 , which will not be described in detail here.

Step S302: determine first information corresponding to the first RACH attempt.

The optional implementation of step S302 can refer to the optional implementation of step S202 in FIG. 2 and other related parts in the embodiment involved in FIG. 2 , which will not be described in detail here.

Step S303: Initiate a first RACH attempt, and select a random access resource to send a random access preamble according to a determination result of performing the first operation on the first RACH attempt.

The optional implementation of step S303 can refer to the optional implementation of step S203 in FIG. 2 and other related parts in the embodiment involved in FIG. 2 , which will not be described in detail here.

In some embodiments, the terminal 101 sends a random access preamble code to the network device 102, but is not limited to this, and the random access preamble code may also be sent to other entities.

Step S304: Initiate a first RACH attempt, and select a random access resource to send a random access preamble according to a result of determining that the first operation is not performed for the first RACH attempt.

The optional implementation of step S304 can refer to the optional implementation of step S204 in FIG. 2 and other related parts in the embodiment involved in FIG. 2 , which will not be described in detail here.

In some embodiments, the terminal 101 sends a random access preamble code to the network device 102, but is not limited to this, and the random access preamble code may also be sent to other entities.

The communication method involved in the embodiment of the present disclosure may include at least one of step S301 to step S304. For example, step S303 may be implemented as an independent embodiment, and step S302 and step S303 may be implemented as independent embodiments, but are not limited thereto.

In some embodiments, step S301 and step S302 may be performed in an exchanged order or simultaneously.

In some embodiments, step S301, step S302 and step S304 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

FIG4 is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG4, the present disclosure embodiment relates to a communication method, which is executed by a terminal side, and the method includes:

Step S401: determine whether to perform a first operation for a non-first RACH attempt in a random access process.

The optional implementation of step S401 can refer to the optional implementation of step S205 in FIG. 2 and other related parts in the embodiment involved in FIG. 2 , which will not be described in detail here.

Step S402: determine first information corresponding to a non-first RACH attempt.

The optional implementation of step S402 can refer to the optional implementation of step S206 in FIG. 2 and other related parts in the embodiment involved in FIG. 2 , which will not be described in detail here.

Step S403: Initiate a non-first RACH attempt, and select a random access resource to send a random access preamble according to a determination result of performing the first operation on the non-first RACH attempt.

The optional implementation of step S403 can refer to the optional implementation of step S207 in FIG. 2 and other related parts in the embodiment involved in FIG. 2 , which will not be described in detail here.

In some embodiments, the terminal 101 sends a random access preamble code to the network device 102, but is not limited to this, and the random access preamble code may also be sent to other entities.

Step S404: Initiate a non-first RACH attempt, and select a random access resource to send a random access preamble according to a determination result that the first operation is not performed for the non-first RACH attempt.

The optional implementation of step S404 can refer to the optional implementation of step S208 in FIG. 2 and other related parts in the embodiment involved in FIG. 2 , which will not be described in detail here.

In some embodiments, the terminal 101 sends a random access preamble code to the network device 102, but is not limited to this, and the random access preamble code may also be sent to other entities.

The communication method involved in the embodiment of the present disclosure may include at least one of step S401 to step S404. For example, step S403 may be implemented as an independent embodiment, and step S402 and step S403 may be implemented as independent embodiments, but are not limited thereto.

In some embodiments, step S401 and step S402 may be performed in an exchanged order or simultaneously.

In some embodiments, step S401, step S402 and step S404 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

In the embodiment of the present disclosure, step S403 can be combined with step S303 of Figure 3, step S404 can be combined with step S304 of Figure 3, step S403 can be combined with step S304 of Figure 3, and step S404 can be combined with step S303 of Figure 3, but it is not limited thereto.

FIG5 is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG5, the present disclosure embodiment relates to a communication method, which is executed by a terminal side, and the method includes:

Step S501: determine whether to perform a first operation for an Nth RACH attempt in a random access process, where N is a natural number greater than 0.

The optional implementation of step S501 can refer to the optional implementation of step S201, step S205 in Figure 2, step S301 in Figure 3, step S401 in Figure 4, and other related parts in the embodiments involved in Figures 2, 3, and 4, which will not be repeated here.

Step S502: determine first information corresponding to the Nth RACH attempt.

The optional implementation of step S502 can refer to the optional implementation of step S202, step S206 in Figure 2, step S302 in Figure 3, step S402 in Figure 4, and other related parts in the embodiments involved in Figures 2, 3, and 4, which will not be repeated here.

Step S503: Initiate an Nth RACH attempt, and select a random access resource to send a random access preamble according to a determination result of performing the first operation on the Nth RACH attempt.

The optional implementation of step S503 can refer to the optional implementation of step S203, step S207 in Figure 2, step S303 in Figure 3, step S403 in Figure 4, and other related parts in the embodiments involved in Figures 2, 3, and 4, which will not be repeated here.

Step S504: Initiate an Nth RACH attempt, and select a random access resource to send a random access preamble according to a result of determining that the first operation is not performed for the Nth RACH attempt.

Optional implementations of step S504 may refer to the optional implementations of step S204 and step S208 in FIG. 2 , step S304 in FIG. 3 , and step S404 in FIG. 4 , as well as other related parts in the embodiments involved in FIG. 2 , FIG. 3 , and FIG. 4 , which will not be described in detail here.

The communication method involved in the embodiment of the present disclosure may include at least one of step S501 to step S504. For example, step S503 may be implemented as an independent embodiment, and step S502 and step S503 may be implemented as independent embodiments, but are not limited thereto.

In some embodiments, step S501 and step S502 may be executed in an exchanged order or simultaneously.

In some embodiments, step S501, step S502 and step S504 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

FIG6 is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG6 , the present disclosure embodiment relates to a communication method, which is executed by a network device side, and the method includes:

Step S601: receiving a random access preamble code sent for an Nth RACH attempt in a random access process, where N is a natural number greater than 0.

The optional implementation of step S601 can refer to step S203 of FIG. 2 , the optional implementation of step S207 , and other related parts of the embodiment involved in FIG. 2 , which will not be described in detail here.

In some embodiments, the network device 102 receives a random access preamble sent by the terminal 101 for the Nth RACH attempt in the random access process, but is not limited thereto and may also receive a random access preamble sent by other entities for the Nth RACH attempt in the random access process.

Step S602: Determine the number of retransmissions of the second information according to the first information in the random access preamble.

The optional implementation of step S602 can refer to step S204 of FIG. 2 , the optional implementation of step S208 , and other related parts of the embodiment involved in FIG. 2 , which will not be described in detail here.

Step S603, respond according to the number of retransmissions.

The optional implementation of step S603 can refer to step S204 of FIG. 2 , the optional implementation of step S208 , and other related parts of the embodiment involved in FIG. 2 , which will not be described in detail here.

In some embodiments, the network device 102 responds to the terminal 101, but is not limited thereto and may also respond to other entities.

The communication method involved in the embodiment of the present disclosure may include at least one of step S601 to step S603. For example, step S603 may be implemented as an independent embodiment, and step S602 and step S603 may be implemented as independent embodiments, but are not limited thereto.

In some embodiments, step S601 and step S602 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

FIG7 is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG7 , the embodiment of the present disclosure relates to a communication method, and the method includes:

Step S701, the terminal determines whether to perform a first operation for the Nth random access channel RACH attempt in the random access process, the first operation includes sending first information to a network device, the first information is used to assist the network device in determining the number of retransmissions of second information, the second information is the information sent by the network device to the terminal during the Nth RACH attempt, where N is a natural number greater than 0.

The optional implementation of step S701 can refer to the optional implementation of step S201, step S205 in Figure 2, step S301 in Figure 3, step S401 in Figure 4, step S501 in Figure 5, and other related parts in the embodiments involved in Figures 2, 3, 4, and 5, which will not be repeated here.

Step S702: The terminal initiates the Nth RACH attempt, and selects a random access resource according to a determination result to send a random access preamble to the network device.

For the optional implementation of step S702, please refer to step S203 and step S207 in Figure 2, step S303 and step S304 in Figure 3, step S403 and step S404 in Figure 4, step S503 and step S504 in Figure 5, and other related parts in the embodiments involved in Figures 2, 3, 4 and 5, which will not be repeated here.

Step S703: The network device responds to the random access preamble code sent by the terminal for the Nth RACH attempt in the random access process.

The optional implementation of step S703 can refer to step S204 and step S208 in FIG. 2 , the optional implementation of step S603 in FIG. 6 , and other related parts in the embodiments involved in FIG. 2 and FIG. 6 , which will not be described in detail here.

The communication method involved in the embodiment of the present disclosure may include at least one of step S701 to step S703. For example, step S702 may be implemented as an independent embodiment, and step S701 and step S702 may be implemented as independent embodiments, but are not limited thereto.

In some embodiments, step S701 and step S703 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

In some embodiments, step S701 and step S702 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

In some embodiments, step S702 and step S703 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

In some embodiments, the above method may include the method steps described in the above embodiments of the terminal side, network device side, communication system side, etc., which will not be repeated here.

FIG8 is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG8 , the present disclosure embodiment relates to a communication method, and the method includes:

Step S801, the terminal determines whether to perform a first operation for the Nth random access channel RACH attempt in the random access process, the first operation includes sending first information to a network device, the first information is used to assist the network device in determining the number of retransmissions of second information, the second information is the information sent by the network device to the terminal during the Nth RACH attempt, where N is a natural number greater than 0.

The optional implementation of step S801 can refer to the optional implementation of step S201, step S205 in Figure 2, step S301 in Figure 3, step S401 in Figure 4, step S501 in Figure 5, and other related parts in the embodiments involved in Figures 2, 3, 4, and 5, which will not be repeated here.

Step S802: The terminal initiates the Nth RACH attempt, and selects a random access resource according to a determination result to send a random access preamble to the network device.

For optional implementations of step S802, please refer to step S203 and step S207 in Figure 2, step S303 and step S304 in Figure 3, step S403 and step S404 in Figure 4, step S503 and step S504 in Figure 5, and other related parts in the embodiments involved in Figures 2, 3, 4 and 5, which will not be repeated here.

The communication method involved in the embodiment of the present disclosure may include at least one of step S801 and step S802. For example, step S801 may be implemented as an independent embodiment, and step S802 may be implemented as an independent embodiment, but is not limited thereto.

In some embodiments, step S802 is optional and may be omitted or replaced in different embodiments.

In some embodiments, step S801 is optional and may be omitted or replaced in different embodiments.

FIG9 is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG9 , the present disclosure embodiment relates to a communication method, and the method includes:

Step S901, the network device responds to the random access preamble sent by the terminal for the Nth RACH attempt in the random access process, where the random access preamble is sent by the terminal using a random access resource selected according to a result of determining whether to perform a first operation for the Nth RACH attempt; wherein the first operation includes the terminal sending first information to the network device, the first information being used to assist the network device in determining a number of retransmissions of second information, the second information being information sent by the network device to the terminal during the Nth RACH attempt, wherein N is a natural number greater than 0.

The optional implementation of step S901 can refer to the optional implementation of step S204 and step S208 in FIG. 2 , step S603 in FIG. 6 , and other related parts in the embodiments involved in FIG. 2 and FIG. 6 , which will not be described in detail here.

In some embodiments, for each RACH attempt during random access, the terminal determines whether to report Msg2/MsgB/Msg4 repetition auxiliary information and/or determines whether to update Msg2/MsgB/Msg4 repetition auxiliary information, and selects the corresponding random access resource to send the Preamble based on the determination result. The Msg2/MsgB/Msg4 repetition auxiliary information corresponds to the first information in the aforementioned embodiment.

In some embodiments, the Msg2/MsgB/Msg4 repetition includes: Msg2/Msg4/MsgB PDCCH repetition and/or Msg2/Msg4/MsgB PDSCH repetition.

In some embodiments, the Msg2/MsgB/Msg4 repetition auxiliary information may include one or more of the following:

Downlink signal quality, such as CQI or downlink reference point RSRP;

The recommended number of repetitions;

Whether the UE supports Msg2/Msg4/MsgB repetition;

In some embodiments, the terminal reports the auxiliary information through Msg1/MsgA, and the terminal distinguishes the content of the auxiliary information through different RACH resources.

In some embodiments, the terminal determines whether to report Msg2/MsgB/Msg4repetition auxiliary information during the random access initialization phase.

In some embodiments, the terminal determines whether to report Msg2/MsgB/Msg4repetition auxiliary information and the content of the reported auxiliary information during the random access initialization phase.

In some embodiments, CBRA resources, CFRA resources, 2-STEP RA resources, 4-STEP RA resources, etc. may be distinguished to individually determine whether to report Msg2/MsgB/Msg4 repetition auxiliary information and the content of the reported auxiliary information.

In some embodiments, the first random access attempt of the UE random access procedure determines the RACH resource using the determination result of whether to report Msg2/MsgB/Msg4 repetition auxiliary information determined in the random access initialization phase and/or the content of the auxiliary information reported when determining to report.

In some embodiments, each subsequent random access attempt of the UE random access procedure uses the determination result of whether to report Msg2/MsgB/Msg4 repetition auxiliary information determined in the random access initialization phase and/or the content of the auxiliary information reported when determining to report to determine the RACH resource.

In some embodiments, for each subsequent random access attempt of the UE random access process, it is re-determined whether to report Msg2/MsgB/Msg4 repetition auxiliary information and/or the content of the auxiliary information reported when reporting is determined, and the corresponding random access resource is selected to send the Preamble based on the determination result.

In some embodiments, updating the auxiliary information content means replacing the RACH resource, wherein the RACH resource corresponds to the random access resource in the above-mentioned embodiment.

In some embodiments, if it is determined to report Msg2/MsgB/Msg4 repetition auxiliary information, the UE uses random access resources corresponding to the content of the reported auxiliary information to send the Preamble according to the content of the reported auxiliary information.

In some embodiments, in subsequent random access attempts of the UE random access process, when a switch between CFRA and CBRA occurs, or a switch from 2-STEP RA to 4-STEP RA occurs, or the number of random access attempts reaches a certain number, it is re-determined whether to report Msg2/MsgB/Msg4 repetition auxiliary information and/or determine the auxiliary information content reported when reporting, and select the corresponding random access resource to send the Preamble based on the determination result. In some embodiments, the above method is applicable to the first time the UE switches from CFRA to CBRA.

In some embodiments, after the UE switches from CFRA to CBRA, each subsequent CBRA random access attempt reports the same auxiliary information as the first CBRA attempt.

In some embodiments, after the auxiliary information is re-determined, subsequent random access attempts are all sent according to the re-determined auxiliary information. Wherein, re-determining the content of the auxiliary information can be understood as updating the content of the auxiliary information used last time.

In some embodiments, in subsequent random access attempts of the UE random access process, the recommended number of repetitions may be increased, and the corresponding random access resource may be selected to send the Preamble according to the increased number of repetitions, wherein the recommended number of repetitions corresponds to the number of retransmissions recommended by the terminal in the above embodiment.

In some embodiments, the UE may select a repetition number greater than the last used repetition number from the configured repetition numbers. For example, the configured repetition numbers are sorted from low to high, and the next repetition number greater than the last used repetition number is selected. The UE may try the current repetition number X times and if it fails, increase the repetition number until the configured maximum repetition number is reached.

In some embodiments, the network configures the candidate repetition times via a system message such as SIB1/SIB19 or an RRC reconfiguration message.

In some embodiments, the network configures the value of X through a system message such as SIB1/SIB19 or an RRC reconfiguration message.

In some embodiments, in subsequent random access attempts of the UE random access process, when the number of msg1repetitions is changed, it is re-determined whether to report Msg2/MsgB/Msg4 repetition auxiliary information and/or the content of the auxiliary information when reporting is determined, and the corresponding random access resource is selected to send the Preamble based on the determination result.

In the embodiments of the present disclosure, part or all of the steps and their optional implementations may be arbitrarily combined with part or all of the steps in other embodiments, or may be arbitrarily combined with optional implementations of other embodiments.

The embodiments of the present disclosure also propose a device for implementing any of the above methods, for example, a device is proposed, the above device includes a unit or module for implementing each step executed by the terminal in any of the above methods. For another example, another device is also proposed, including a unit or module for implementing each step executed by a network device (such as an access network device, a core network function node, a core network device, etc.) in any of the above methods.

It should be understood that the division of the units or modules in the above devices is only a division of logical functions, and in actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. In addition, the units or modules in the device can be implemented in the form of a processor calling software: for example, the device includes a processor, the processor is connected to a memory, and instructions are stored in the memory. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the units or modules of the above devices, wherein the processor is, for example, a general-purpose processor, such as a central processing unit (CPU) or a microprocessor, and the memory is a memory inside the device or a memory outside the device. Alternatively, the units or modules in the device may be implemented in the form of hardware circuits, and the functions of some or all of the units or modules may be implemented by designing the hardware circuits. The hardware circuits may be understood as one or more processors; for example, in one implementation, the hardware circuits are application-specific integrated circuits (ASICs), and the functions of some or all of the above units or modules may be implemented by designing the logical relationship of the components in the circuits; for another example, in another implementation, the hardware circuits may be implemented by programmable logic devices (PLDs), and Field Programmable Gate Arrays (FPGAs) may be used as an example, which may include a large number of logic gate circuits, and the connection relationship between the logic gate circuits may be configured by configuring the configuration files, thereby implementing the functions of some or all of the above units or modules. All units or modules of the above devices may be implemented in the form of software called by the processor, or in the form of hardware circuits, or in the form of software called by the processor, and the remaining part may be implemented in the form of hardware circuits.

In the embodiment of the present disclosure, the processor is a circuit with signal processing capability. In one implementation, the processor may be a circuit with instruction reading and running capability, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which may be understood as a microprocessor), or a digital signal processor (DSP), etc.; in another implementation, the processor may implement certain functions through the logical relationship of the hardware circuit, and the logical relationship of the above hardware circuit is fixed or reconfigurable, such as a hardware circuit implemented by a processor as an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and implementing the hardware circuit configuration may be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. In addition, it may also be a hardware circuit designed for artificial intelligence, which may be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc.

FIG10 is a schematic diagram of the structure of a terminal proposed according to an embodiment of the present disclosure. As shown in FIG10, the terminal 101 may include: at least one of a first transceiver module 1001, a first processing module 1002, etc. In some embodiments, the first processing module 1002 is used to determine whether to perform a first operation for the Nth random access channel RACH attempt in the random access process, and the first operation includes sending a first information to a network device, and the first information is used to assist the network device in determining the number of retransmissions of the second information, and the second information is the information sent by the network device to the terminal during the Nth RACH attempt, wherein N is a natural number greater than 0. The first transceiver module 1001 is used to initiate the Nth RACH attempt, and select a random access resource according to the determination result to send a random access preamble code to the network device.

Optionally, the first transceiver module 1001 is used to execute at least one of the communication steps such as sending and/or receiving (such as step S203, step S207, but not limited thereto) executed by the terminal 101 in any of the above methods, which will not be described in detail here. Optionally, the first processing module 1002 is used to execute at least one of the other steps (such as step S201, step S202, step S204, step S205, step S206, step S208, but not limited thereto) executed by the terminal 101 in any of the above methods, which will not be described in detail here.

Optionally, the second information includes at least one of the following sent based on a physical downlink control channel PDCCH and/or a physical downlink shared channel PDSCH:

Message Msg 2;

Message Msg 4;

Message Msg B.

Optionally, the first information includes a parameter value of at least one of the following parameter items:

The first parameter item is used to indicate the downlink signal quality;

The second parameter item is used to indicate the number of retransmissions recommended by the terminal;

The third parameter item is used to indicate whether the terminal supports the function of the network device resending the second information.

Optionally, the first information is carried in a message Msg 1 or a message Msg A and sent to the network device.

Optionally, the access mode attempted by the RACH includes at least one of the following:

Contention-based random access (CBRA);

Non-contention random access CFRA;

2-step random access 2-STEP RA;

4-STEP RA.

Optionally, the first processing module 1002 is used to determine whether to perform the first operation for each access mode before determining whether to perform the first operation for the Nth RACH attempt in the random access process; and determine the determination result according to the access mode corresponding to the Nth RACH attempt.

Optionally, the first information including different parameter values corresponds to different random access resources; the first transceiver module 1001 is used to determine the corresponding random access resource according to the parameter value in the first information, and send a random access preamble code.

Optionally, the first processing module 1002 is used to determine whether to perform the first operation for a first RACH attempt in a random access initialization phase.

Optionally, the first processing module 1002 is used to determine whether to perform the first operation for a non-first RACH attempt during a random access initialization phase.

Optionally, the first processing module 1002 is used to determine to perform the first operation and determine a parameter value in the first information in a random access initialization phase.

Optionally, the first processing module 1002 is used to determine, for a non-first RACH attempt, before initiating the non-first RACH attempt, whether to perform the first operation for the non-first RACH attempt.

Optionally, the first operation also includes updating the first information; the first processing module 1002 is used to determine whether to update a parameter value in the first information for the non-first RACH attempt.

Optionally, the first processing module 1002 is configured to, before determining whether to perform the first operation for the non-first RACH attempt, determine that a first condition is satisfied, where the first condition includes at least one of the following:

The access mode of the RACH attempt is switched from CFRA to CBRA;

The access mode of RACH attempt is switched from 2-STEP RA to 4-STEP RA;

The number of RACH attempts reaches a first specified number;

The number of retransmissions of message Msg 1 has changed.

Optionally, the first processing module 1002 is used to update the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt, wherein the number of retransmissions recommended by the terminal in the updated first information is greater than the number of retransmissions recommended by the terminal in the first information sent last time, and/or the number of retransmissions recommended by the terminal in the updated first information is greater than the number of retransmissions of the second information during the last RACH attempt that is not the first RACH attempt.

Optionally, the first transceiver module 1001 is used to receive third information sent by the network device before updating the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt, where the third information is used to configure a candidate retransmission number sequence;

The first processing module 1002 is used to determine, from the candidate retransmission number sequence, a minimum candidate retransmission number that is greater than the number of retransmissions recommended by the terminal in the first information sent last time; and update the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt according to the minimum candidate retransmission number.

Optionally, the third information is any one of the following:

System information block SIB 1;

SIB 19;

Radio Resource Control RRC reconfiguration message.

Optionally, the first transceiver module 1001 is used to receive fourth information sent by the network device before updating the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt;

The first processing module 1002 is used to determine the number of retransmissions of the second information during the last RACH attempt that is not the first RACH attempt according to the fourth information; and update the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt according to a value greater than the number of retransmissions of the second information.

Optionally, the fourth information is any one of the following:

SIB 1;

SIB 19;

RRC reconfiguration message.

Optionally, the first processing module 1002 is used to determine that the number of retransmissions recommended by the terminal in the first information sent last time is less than a second specified number before updating the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt.

In some embodiments, the first transceiver module 1001 may include a sending module and/or a receiving module, and the sending module and the receiving module may be separate or integrated. Optionally, the "first transceiver module" may be replaced with the "first transceiver".

In some embodiments, the first processing module 1002 may be a module or may include multiple submodules. Optionally, the multiple submodules respectively execute all or part of the steps required to be executed by the first processing module 1002. Optionally, the "first processing module" may be replaced with the "first processor".

FIG11 is a schematic diagram of the structure of a network device proposed according to an embodiment of the present disclosure. As shown in FIG11, the network device 102 may include: at least one of a second transceiver module 1101, a second processing module 1102, etc. In some embodiments, the second processing module 1102 is used to respond to a random access preamble sent by a terminal for the Nth RACH attempt during a random access process, wherein the random access preamble is sent by the terminal based on a random access resource selected by the terminal according to a result of determining whether to perform a first operation for the Nth RACH attempt; wherein the first operation includes the terminal sending first information to the network device, the first information is used to assist the network device in determining the number of retransmissions of the second information, and the second information is information sent by the network device to the terminal during the Nth RACH attempt, wherein N is a natural number greater than 0.

Optionally, the second transceiver module 1101 is used to execute at least one of the communication steps such as sending and/or receiving (such as step S203, step S207, but not limited thereto) executed by the network device 102 in any of the above methods, which will not be described in detail here. Optionally, the second processing module 1102 is used to execute at least one of the other steps (such as step S201, step S202, step S204, step S205, step S206, step S208, but not limited thereto) executed by the network device 102 in any of the above methods, which will not be described in detail here.

In some embodiments, the second transceiver module 1101 may include a sending module and/or a receiving module, and the sending module and the receiving module may be separate or integrated. Optionally, the "second transceiver module" may be replaced with the "second transceiver".

In some embodiments, the second processing module 1102 may be a module or may include multiple submodules. Optionally, the multiple submodules respectively execute all or part of the steps required to be executed by the second processing module 1102. Optionally, the "second processing module" may be replaced with the "second processor".

FIG12 is a schematic diagram of the structure of a communication device 8100 according to an embodiment of the present disclosure. The communication device 8100 may be a network device (e.g., an access network device, a core network device, etc.), or a terminal (e.g., a user device, etc.), or a chip, a chip system, or a processor that supports a network device to implement any of the above methods, or a chip, a chip system, or a processor that supports a terminal to implement any of the above methods. The communication device 8100 may be used to implement the method described in the above method embodiment, and the details may refer to the description in the above method embodiment.

As shown in FIG. 12 , the communication device 8100 includes one or more third processors 8101. The third processor 8101 may be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor may be used to process the communication protocol and the communication data, and the central processing unit may be used to control the communication device (such as a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute a program, and process the data of the program. Optionally, the communication device 8100 is used to execute any of the above methods. Optionally, one or more third processors 8101 are used to call instructions so that the communication device 8100 executes any of the above methods.

In some embodiments, the communication device 8100 further includes one or more third transceivers 8102. When the communication device 8100 includes one or more third transceivers 8102, the third transceiver 8102 performs at least one of the communication steps such as sending and/or receiving in the above method (for example, step S203, step S207, but not limited thereto), and the third processor 8101 performs at least one of the other steps (for example, step S201, step S202, step S204, step S205, step S206, step S208, but not limited thereto). In an optional embodiment, the transceiver may include a receiver and/or a transmitter, and the receiver and the transmitter may be separated or integrated together. Optionally, the terms such as transceiver, transceiver unit, transceiver, transceiver circuit, interface circuit, interface, etc. may be replaced with each other, the terms such as transmitter, transmitting unit, transmitter, transmitting circuit, etc. may be replaced with each other, and the terms such as receiver, receiving unit, receiver, receiving circuit, etc. may be replaced with each other.

In some embodiments, the communication device 8100 further includes one or more third memories 8103 for storing data. Optionally, all or part of the third memories 8103 may also be outside the communication device 8100. In an optional embodiment, the communication device 8100 may include one or more first interface circuits 8104. Optionally, the first interface circuit 8104 is connected to the third memory 8103, and the first interface circuit 8104 may be used to receive data from the third memory 8103 or other devices, and may be used to send data to the third processor 8101 or other devices. For example, the first interface circuit 8104 may read the data stored in the third memory 8103 and send the data to the third processor 8101.

The communication device 8100 described in the above embodiments may be a network device or a terminal, but the scope of the communication device 8100 described in the present disclosure is not limited thereto, and the structure of the communication device 8100 may not be limited by FIG. 12. The communication device may be an independent device or may be part of a larger device. For example, the communication device may be: 1) an independent integrated circuit IC, or a chip, or a chip system or subsystem; (2) a collection of one or more ICs, optionally, the above IC collection may also include a storage component for storing data and programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handheld device, a mobile unit, a vehicle-mounted device, a network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc.

Fig. 13 is a schematic diagram of the structure of a chip 8200 according to an embodiment of the present disclosure. If the communication device 8100 may be a chip or a chip system, reference may be made to the schematic diagram of the structure of the chip 8200 shown in Fig. 13, but the present invention is not limited thereto.

The chip 8200 includes one or more fourth processors 8201. The chip 8200 is configured to execute any of the above methods.

In some embodiments, the chip 8200 further includes one or more second interface circuits 8202. Optionally, the terms such as interface circuit, interface, transceiver pin, etc. can be interchangeable. In some embodiments, the chip 8200 further includes one or more fourth memories 8203 for storing data. Optionally, all or part of the fourth memory 8203 can be outside the chip 8200. Optionally, the second interface circuit 8202 is connected to the fourth memory 8203, the second interface circuit 8202 can be used to receive data from the fourth memory 8203 or other devices, and the second interface circuit 8202 can be used to send data to the fourth memory 8203 or other devices. For example, the second interface circuit 8202 can read the data stored in the fourth memory 8203 and send the data to the fourth processor 8201.

In some embodiments, the second interface circuit 8202 performs at least one of the communication steps such as sending and/or receiving in the above method (for example, step S203, step S207, but not limited thereto). The second interface circuit 8202 performs the communication steps such as sending and/or receiving in the above method, for example, means that the second interface circuit 8202 performs data interaction between the fourth processor 8201, the chip 8200, the fourth memory 8203 or the transceiver device. In some embodiments, the fourth processor 8201 performs at least one of the other steps (for example, step S201, step S202, step S204, step S205, step S206, step S208, but not limited thereto).

The modules and/or devices described in the embodiments such as virtual devices, physical devices, chips, etc. can be combined or separated as needed. Optionally, some or all steps can also be performed by multiple modules and/or devices in collaboration, which is not limited here.

The present disclosure also proposes a storage medium, on which instructions are stored. When the instructions are executed on the communication device 8100, the communication device 8100 executes any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but is not limited to this, and it can also be a storage medium readable by other devices. Optionally, the storage medium can be a non-transitory storage medium, but is not limited to this, and it can also be a temporary storage medium.

The present disclosure also proposes a program product, which, when executed by the communication device 8100, enables the communication device 8100 to execute any of the above methods. Optionally, the program product is a computer program product.

The present disclosure also proposes a computer program, which, when executed on a computer, causes the computer to execute any one of the above methods.

Claims (25)

1. A method of communication, performed by a terminal, the method comprising:

Determining whether to perform a first operation for an nth random access channel RACH attempt in a random access procedure, the first operation including transmitting first information to a network device, the first information being used to assist the network device in determining a number of retransmissions of second information, the second information being information transmitted to the terminal by the network device in the nth random access channel RACH attempt procedure, wherein N is a natural number greater than 0;

Initiating the Nth random access channel RACH attempt, selecting random access resources to send a random access preamble to the network equipment according to a determination result;

the determining whether to perform the first operation for an nth random access channel, RACH, attempt in the random access procedure includes:

Determining the determination result according to an access mode corresponding to the Nth random access channel RACH attempt; the random access channel RACH attempts access mode includes at least one of the following:

contention-based random access CBRA;

Non-contention random access, CFRA;

STEP 2, randomly accessing 2-STEP RA;

4-STEP RA。

2. The method of claim 1, wherein the second information comprises at least one of the following based on physical downlink control channel, PDCCH, and/or physical downlink shared channel, PDSCH, transmission:

message Msg 2;

Message Msg 4;

message Msg B.

3. The method of claim 1, wherein the step of determining the position of the substrate comprises,

The first information includes parameter values of at least one of the following:

a first parameter item, configured to indicate downlink signal quality;

a second parameter item for indicating the number of retransmissions recommended by the terminal;

And a third parameter item, configured to indicate whether the terminal supports a function of retransmitting the second information by the network device.

4. The method of claim 1, wherein the step of determining the position of the substrate comprises,

The first information is carried in a message Msg 1 or a message Msg a to be sent to the network device.

5. The method of claim 1, comprising, prior to said determining whether to perform the first operation for an nth random access channel, RACH, attempt in a random access procedure:

and determining whether to execute the first operation or not respectively for each access mode.

6. The method according to any one of claims 1 to 5, wherein,

The first information comprising different parameter values corresponds to different random access resources;

The initiating the nth random access channel RACH attempt, selecting a random access resource according to a determination result, and transmitting a random access preamble to the network device, including:

and determining corresponding random access resources according to the parameter values in the first information, and sending a random access preamble.

7. The method of claim 6, wherein the determining whether to perform the first operation for an nth random access channel, RACH, attempt in the random access procedure comprises:

it is determined in a random access initialization phase whether to perform the first operation for a first RACH attempt.

8. The method of claim 7, wherein the determining whether to perform the first operation for an nth random access channel, RACH, attempt in the random access procedure comprises:

It is determined in a random access initialization phase whether to perform the first operation for a non-first RACH attempt.

9. The method according to claim 7 or 8, characterized in that the method further comprises:

And determining to execute the first operation, and determining parameter values in the first information in a random access initialization stage.

10. The method of claim 7, wherein the determining whether to perform the first operation for an nth random access channel, RACH, attempt in the random access procedure comprises:

For a non-first RACH attempt, before initiating the non-first RACH attempt, it is determined whether to perform the first operation for the non-first RACH attempt.

11. The method of claim 10, wherein the step of determining the position of the first electrode is performed,

The first operation further includes updating the first information;

the determining whether to perform the first operation for the non-first RACH attempt includes:

For the non-first RACH attempt, a determination is made as to whether to update the parameter values in the first information.

12. The method of claim 10 or 11, comprising, prior to determining whether to perform the first operation for the non-first RACH attempt:

Determining that a first condition is satisfied, the first condition comprising at least one of:

the access mode of RACH attempt is switched from CFRA to CBRA;

the RACH attempted access mode is switched from 2-STEP RA to 4-STEP RA;

the number of RACH attempts reaches a first specified number;

the number of retransmissions of the message Msg 1 is changed.

13. The method of claim 11, wherein the determining whether to update the parameter values in the first information for the non-first RACH attempt comprises:

Updating the number of retransmission times of the terminal in the first information corresponding to the non-first RACH attempt, wherein the number of retransmission times of the terminal in the updated first information is greater than the number of retransmission times of the terminal in the first information transmitted last time, and/or the number of retransmission times of the terminal in the updated first information is greater than the number of retransmission times of the second information in the process of the last RACH attempt of the non-first RACH attempt.

14. The method of claim 13, comprising, prior to said updating the number of retransmissions proposed by the terminal in the first information corresponding to the non-first RACH attempt:

receiving third information sent by the network equipment, wherein the third information is used for configuring a candidate retransmission time sequence;

determining a minimum candidate retransmission number greater than the retransmission number recommended by the terminal in the first information transmitted last time from the candidate retransmission number sequence;

The updating the retransmission times recommended by the terminal in the first information corresponding to the non-first RACH attempt includes:

And updating the retransmission times recommended by the terminal in the first information corresponding to the non-first RACH attempt according to the minimum candidate retransmission times.

15. The method of claim 14, wherein the third information is any one of:

system message block SIB 1;

SIB 19；

A radio resource control, RRC, reconfiguration message.

16. The method of claim 13, comprising, prior to said updating the number of retransmissions proposed by the terminal in the first information corresponding to the non-first RACH attempt:

Receiving fourth information sent by the network equipment;

Determining the retransmission times of the second information in the process of the last RACH attempt of the non-first RACH attempt according to the fourth information;

The updating the retransmission times recommended by the terminal in the first information corresponding to the non-first RACH attempt includes:

And updating the recommended retransmission times of the terminal in the first information corresponding to the non-first RACH attempt according to a value larger than the retransmission times of the second information.

17. The method of claim 16, wherein the fourth information is any one of:

SIB 1；

SIB 19；

RRC reconfiguration message.

18. The method according to any of claims 13-17, characterized in that before updating the number of retransmissions recommended by the terminal in the first information corresponding to the non-first RACH attempt, it comprises:

And determining that the number of retransmission times suggested by the terminal in the first information transmitted last time is smaller than a second designated number.

19. A method of communication, performed by a network device, the method comprising:

Responding to a random access preamble sent by a terminal aiming at an Nth random access channel RACH attempt in a random access process, wherein the random access preamble is sent by the terminal according to a random access resource selected by a determination result of whether to execute a first operation aiming at the Nth random access channel RACH attempt, the determination result is determined by the terminal according to an access mode corresponding to the Nth random access channel RACH attempt, and the access mode of the random access channel RACH attempt comprises at least one of the following steps:

contention-based random access CBRA;

Non-contention random access, CFRA;

STEP 2, randomly accessing 2-STEP RA;

4-STEP RA；

The first operation includes that the terminal sends first information to the network device, the first information is used for assisting the network device to determine retransmission times of second information, the second information is information sent to the terminal by the network device in the process of the Nth random access channel RACH attempt, and N is a natural number greater than 0.

20. A terminal, comprising:

A first processing module, configured to determine whether to perform a first operation for an nth random access channel RACH attempt in a random access procedure, where the first operation includes sending first information to a network device, where the first information is used to assist the network device in determining a number of retransmissions of second information, where the second information is information sent by the network device to the terminal in the nth random access channel RACH attempt, and N is a natural number greater than 0;

a first transceiver module, configured to initiate the nth random access channel RACH attempt, select a random access resource according to a determination result, and send a random access preamble to the network device;

The first processing module is configured to determine the determination result according to an access mode corresponding to the nth random access channel RACH attempt; the random access channel RACH attempts access mode includes at least one of the following:

contention-based random access CBRA;

Non-contention random access, CFRA;

STEP 2, randomly accessing 2-STEP RA;

4-STEP RA。

21. a network device, comprising:

A second processing module, configured to respond to a random access preamble sent by a terminal for an nth random access channel RACH attempt in a random access procedure, where the random access preamble is sent by the terminal according to a random access resource selected by the terminal according to a determination result of whether to execute a first operation for the nth random access channel RACH attempt, where the determination result is determined by the terminal according to an access manner corresponding to the nth random access channel RACH attempt, and the access manner of the random access channel RACH attempt includes at least one of:

contention-based random access CBRA;

Non-contention random access, CFRA;

STEP 2, randomly accessing 2-STEP RA;

4-STEP RA；

The first operation includes that the terminal sends first information to the network device, the first information is used for assisting the network device to determine retransmission times of second information, the second information is information sent to the terminal by the network device in the process of the Nth random access channel RACH attempt, and N is a natural number greater than 0.

22. A terminal, comprising:

One or more first processors;

A first memory coupled to the first processor, the first memory having stored thereon executable instructions that, when executed by the first processor, cause the terminal to perform the communication method of any of claims 1-18.

23. A network device, comprising:

One or more second processors;

A second memory coupled to the second processor, the second memory having stored thereon executable instructions that, when executed by the second processor, cause the network device to perform the communication method of claim 19.

24. A communication system comprising a terminal configured to implement the communication method of any of claims 1-18, and a network device configured to implement the communication method of claim 19.

25. A storage medium storing instructions that, when executed on a communication device, cause the communication device to perform the communication method of any one of claims 1-19.