Random access channel transmission resource selection method, apparatus and readable storage medium

Abstract

Provided in the present disclosure are a random access channel transmission resource selection method, an apparatus and a readable storage medium. The method comprises: determining a target random access channel (RACH) resource configured by a network side device; on the basis of the target RACH resource, determining a random access opportunity (RO) resource used for an initial RACH attempt during a random access procedure, and performing physical random access channel (PRACH) transmission on the RO resource used for the initial RACH attempt; and, after a predefined condition has been satisfied, performing a subsequent RACH attempt by means of RO resource switching. The random access channel transmission resource selection method, the apparatus and the readable storage medium which are provided by the present disclosure enable terminals capable of identifying different symbol types to select, on the basis of the symbol types, resources used for PRACH transmission, thus ensuring the random access performance.

Description

Random access channel transmission resource selection method, device and readable storage medium

[0001] The present disclosure claims priority to a Chinese patent application filed with the Patent Office of China on April 3, 2024, with application number 202410403801.6 and application name “Random access channel transmission resource selection method, device and readable storage medium”, and claims priority to a Chinese patent application filed with the Patent Office of China on November 8, 2024, with application number 202411594225.4 and application name “Random access channel transmission resource selection method, device and readable storage medium”, the entire contents of which are incorporated into the present disclosure by reference. Technical Field

[0002] The present disclosure relates to the field of communication technology, and more specifically, to a method, device, and readable storage medium for selecting transmission resources for a random access channel. Background Art

[0003] The terminal transmits the Physical Random Access Channel (PRACH) on the PRACH transmission resource. In related technologies, regardless of symbol type, the terminal can select PRACH transmission resources on all symbols.

[0004] Research has shown that with the introduction of a subband full-duplex (SBFD) system, when both SBFD and non-SBFD symbols are present, only SBFD UEs can transmit on the physical random access channel (PAC) during SBFD symbols. In this scenario, contention-based random access has a lower collision probability, making access more likely. However, adjacent channel interference on SBFD symbols is significant, potentially impacting random access performance. Conversely, non-SBFD symbols have lower interference, but more UEs contend for access, leading to a higher collision probability.

[0005] Currently, in related technologies, a terminal that can identify different symbol types cannot select resources used for PRACH transmission based on the symbol type, and thus cannot guarantee the performance of random access. Summary of the Invention

[0006] The present disclosure provides a method, device and readable storage medium for selecting random access channel transmission resources, which solves the technical problem in the related art that a terminal that can identify different symbol types cannot select resources for PRACH transmission based on the symbol type, and thus cannot guarantee the performance of random access.

[0007] In a first aspect, the present disclosure provides a random access channel transmission resource selection method, applied to a terminal, the method comprising:

[0008] Determine the target random access channel (RACH) resource configured by the network side device;

[0009] Determine the random access opportunity RO resource to be used for the initial RACH attempt in the random access process based on the target RACH resource, and perform physical random access channel PRACH transmission on the RO resource used for the initial RACH attempt;

[0010] After the predefined conditions are met, subsequent RACH attempts are made by switching RO resources.

[0011] In the embodiment of the present disclosure, the terminal determines to perform PRACH transmission on the RO resource used in the initial RACH attempt by receiving configuration information of the RACH resource configured by the network-side device. If a predefined condition is met (for example, the attempt fails M times, or the interference is relatively large, etc.), the terminal can provide the ability to switch the RO resource to perform RO resource switching, switching to a symbol with less interference or easier to successfully access for random access. Based on the RO resource switching capability of the terminal, it can be applicable to terminals that can identify different symbol types, thereby improving the random access success rate and random access performance.

[0012] In some embodiments, the predefined condition is that the number of failed RACH attempts in one RACH process reaches a maximum number of attempts.

[0013] In some embodiments, the maximum number of attempts in the predefined condition is the maximum number of attempts of the terminal on the first RO resource configured by the network side device, and the first RO resource is determined based on the target RACH resource; or

[0014] The maximum number of attempts in the predefined condition is the maximum number of RACH attempts of one RACH process configured by the network side device.

[0015] In the embodiment of the present disclosure, when a RACH attempt fails in one RACH process and reaches the maximum number of attempts on the first RO resource or the maximum number of RACH attempts for one RACH process configured by the network side device, the terminal switches the RO resource used for subsequent RACH attempts, thereby improving the random access success rate and random access performance.

[0016] In some embodiments, determining, based on the target RACH resource, a random access opportunity (RO) resource to be used for an initial RACH attempt in a random access procedure includes:

[0017] determining a first RO resource and a second RO resource according to the target RACH resource;

[0018] An RO resource to be used for an initial RACH attempt in a random access procedure is determined from the first RO resource and the second RO resource.

[0019] In the embodiment of the present disclosure, the terminal divides the received target RACH resource into a first RO resource and a second RO resource, and selects the RO resource preferentially used in the initial RACH attempt from the first RO resource and the second RO resource for PRACH transmission, so that access can be performed more easily, thereby improving the success rate of random access.

[0020] In some embodiments, the performing a subsequent RACH attempt by switching RO resources includes:

[0021] If the RO resource used in the initial RACH attempt is the first RO resource, after switching the RO resource, the subsequent RACH attempts use the second RO resource;

[0022] If the RO resource used in the initial RACH attempt is the second RO resource, after the RO resource is switched, the subsequent RACH attempts use the first RO resource.

[0023] In the embodiment of the present disclosure, if the terminal fails in a RACH attempt and reaches the maximum number of attempts during a RACH process, in order to ensure successful access and / or improve random access performance, the RO resource used for subsequent RACH attempts will be switched. For example, the first RACH attempt uses the first RO resource, the RO resource after switching is the second RO resource, and the second RO resource is used in subsequent RACH attempts, or the first RACH attempt uses the second RO resource, the RO resource after switching is the first RO resource, and the first RO resource is used in subsequent RACH attempts.

[0024] In some embodiments, the target RACH resource is a first RACH resource, and determining the first RO resource and the second RO resource according to the target RACH resource includes:

[0025] Determining a first RO resource and a second RO resource according to the first RACH resource;

[0026] The first RO resource is a valid RO set on a sub-band full-duplex downlink (SBFD) DL symbol in the first RACH resource, and the second RO resource is a valid RO set on a sub-band full-duplex flexible (SBFD) flexible symbol in the first RACH resource and / or a valid RO set on a non-SBFD symbol in the first RACH resource; or

[0027] The first RO resource is a valid RO set on SBFD symbols in the first RACH resource, and the second RO resource is a valid RO set on non-SBFD symbols in the first RACH resource.

[0028] In an embodiment of the present disclosure, a terminal receives information sent by a network-side device indicating a first RACH resource configured for the terminal. Based on the first RACH resource, the terminal determines that the first RO resource is a valid RO set on SBFD DL symbols in the first RACH resource, and determines that the second RO resource is a valid RO set on SBFD flexible symbols in the first RACH resource and / or a valid RO set on non-SBFD symbols in the first RACH resource. Alternatively, based on the first RACH resource, the terminal determines that the first RO resource is a valid RO set on SBFD symbols in the first RACH resource, and determines that the second RO resource is a valid RO set on non-SBFD symbols in the first RACH resource. Therefore, the first RO resource is a valid RO set on SBFD symbols in the first RACH resource or on SBFD DL symbols in SBFD symbols, and the second RO resource is a valid RO set on SBFD flexible symbols and / or non-SBFD symbols in SBFD symbols in the first RACH resource.

[0029] In some embodiments, the target RACH resource includes a second RACH resource and a third RACH resource, and determining the first RO resource and the second RO resource according to the target RACH resource includes:

[0030] Determine the first RO resource according to the second RACH resource, where the first RO resource is a valid RO set on an SBFD symbol in the second RACH resource;

[0031] The second RO resource is determined according to the third RACH resource, where the second RO resource is a valid RO set on SBFD flexible symbols in the third RACH resource and / or a valid RO set on non-SBFD symbols in the third RACH resource.

[0032] In an embodiment of the present disclosure, a terminal receives information sent by a network-side device indicating a second RACH resource and a third RACH resource configured for the terminal. Based on the second RACH resource, the terminal determines that the first RO resource is a valid RO set on SBFD symbols in the second RACH resource. Based on the third RACH resource, the terminal determines that the second RO resource is a valid RO set on SBFD flexible symbols among the SBFD symbols in the third RACH resource and / or a valid RO set on non-SBFD symbols in the third RACH resource. Therefore, the first RO resource is a valid RO set on SBFD symbols in the second RACH resource, and the second RO resource is a valid RO set on SBFD flexible symbols and / or non-SBFD symbols among the SBFD symbols in the third RACH resource.

[0033] In some embodiments, determining the RO resource to be used for the initial RACH attempt in the random access process from the first RO resource and the second RO resource includes any of the following:

[0034] Determine the RO resource to be used for the initial RACH attempt during random access according to the protocol predefined rules;

[0035] Determining, according to the instruction information of the network side device, the RO resource to be used for the initial RACH attempt in the random access process;

[0036] According to the threshold, the RO resource to be used for the initial RACH attempt in the random access process is determined.

[0037] In the disclosed embodiments, a terminal can determine the RO resource to be used for the initial RACH attempt during a random access process in at least three ways: Method 1: When the network side configures the first RO resource, the first RO resource is preferentially used for the first RACH attempt (here, the initial time, i.e., the number of preamble transmissions N is equal to 1); Method 2: The network side device indicates the RO resource to be used for the first RACH attempt; Method 3: The UE determines the RO resource to be used for the first attempt based on a threshold. This achieves diversified RO resource selection methods for the initial RACH attempt.

[0038] In some embodiments, the protocol predefined rule includes: when the network side device configures the first RO resource, the first RO resource is preferentially used in the initial RACH attempt during the random access process.

[0039] In the disclosed embodiment, based on the protocol predefined rules, it can be ensured that the SBFD UE preferentially selects SBFD symbols for random access, thereby reducing contention conflicts and improving the success rate of random access.

[0040] In some embodiments, the indication information includes an RO resource used in an initial RACH attempt during an initial random access process and an RO resource used in an initial RACH attempt during a non-initial random access process;

[0041] The RO resources used in the initial RACH attempt during the initial random access process are configured by the network side device through the system information block SIB, and the RO resources used in the initial RACH attempt during the non-initial random access process are configured by the network side device through the radio resource control RRC.

[0042] In an embodiment of the present disclosure, the terminal may determine the RO resource to be preferentially adopted in the first RACH attempt of the initial random access process based on the indication information of the RO resource to be adopted in the first RACH attempt of the initial random access process configured by the network side device through the SIB, or the terminal may determine the RO resource to be preferentially adopted in the first RACH attempt of the subsequent random access process based on the indication information of the RO resource to be adopted in the first RACH attempt of the non-initial random access process configured by the network side device through the RRC, thereby realizing flexible adjustment of the RO resource.

[0043] In some embodiments, determining, based on the threshold, the RO resource to be used for the initial RACH attempt in the random access process includes:

[0044] Determining, based on a comparison result of a reference signal received power (RSRP) measurement result and the threshold, an RO resource to be used for an initial RACH attempt in a random access process;

[0045] The RSRP measurement result is an RSRP measurement result corresponding to a reference signal index adopted in an initial RACH attempt; or, the RSRP measurement result is an RSRP measurement result of a downlink path loss reference.

[0046] In an embodiment of the present disclosure, the terminal compares the RSRP measurement result corresponding to the reference signal index used in the initial RACH attempt with the threshold, or the terminal compares the RSRP measurement result of the downlink path loss reference with the threshold, and determines the RO resource to be preferentially used in the initial RACH attempt in the random access process (including initial random access and / or subsequent random access), thereby improving the random access success rate and / or random access performance.

[0047] In some embodiments, determining the RO resource to be used in the initial RACH attempt during the random access process based on the comparison result of the reference signal received power (RSRP) measurement result and the threshold includes:

[0048] determining, according to the threshold indication information of the network-side device and the comparison result, an RO resource to be used for an initial RACH attempt in a random access process;

[0049] The threshold indication information is used to indicate: when the comparison result is that the RSRP measurement result is greater than or equal to the threshold, the RO resource to be used for the initial RACH attempt during the random access process; or, when the comparison result is that the RSRP measurement result is less than the threshold, the RO resource to be used for the initial RACH attempt during the random access process;

[0050] or,

[0051] The threshold indication information is used to indicate: when the comparison result shows that the RSRP measurement result is greater than the threshold, the RO resource to be used in the initial RACH attempt during the random access process; or when the comparison result shows that the RSRP measurement result is less than or equal to the threshold, the RO resource to be used in the initial RACH attempt during the random access process.

[0052] In the embodiment of the present disclosure, the terminal receives threshold indication information from the network side device, thereby being able to determine the RO resource to be used for the initial RACH attempt in the random access process based on the threshold indication information and the comparison result between the RSRP measurement result and the threshold, thereby improving the random access success rate and / or random access performance.

[0053] In some embodiments, the RO resource used in the initial RACH attempt during the random access process satisfies any of the following conditions:

[0054] In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource;

[0055] In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource;

[0056] In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource;

[0057] In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource.

[0058] In the embodiment of the present disclosure, when the target RACH resource is the first RACH resource, more RO access opportunities can be increased. When the target RACH resource includes the second RACH resource and the third RACH resource, the long PRACH format can be configured through the second RACH resource to increase coverage performance. The terminal can flexibly select the RO resource for the initial RACH attempt during the random access process for these two different situations, thereby improving the random access success rate and / or random access performance.

[0059] In a second aspect, the present disclosure provides a random access channel transmission resource selection method, which is applied to a network side device, and the method includes:

[0060] Determine a target random access channel RACH resource configured for the terminal;

[0061] The configuration information of the target RACH resource is sent to the terminal, where the target RACH resource is used by the terminal to determine the RO resource to be used for the initial RACH attempt in the random access process, and to perform subsequent RACH attempts by switching the RO resource after a predefined condition is met.

[0062] In an embodiment of the present disclosure, a network-side device configures a target RACH resource for a terminal and sends configuration information of the target RACH resource to the terminal, so that the terminal determines the RACH resource based on the RACH resource location in the configuration information sent by the network-side device, and determines to perform PRACH transmission on the RO resource used in the initial RACH attempt. If a predefined condition is met (for example, M attempts have failed, or interference is relatively large), the terminal is capable of switching the RO resource and performing random access on a symbol with less interference or easier successful access. Based on the RO resource switching capability of the terminal, it can be applicable to terminals that can identify different symbol types, thereby improving the random access success rate and random access performance.

[0063] In some embodiments, the method further comprises:

[0064] A maximum number of attempts configured for the terminal is determined.

[0065] In some embodiments, the maximum number of attempts is the maximum number of attempts of the terminal on a first RO resource, where the first RO resource is determined by the terminal based on the target RACH resource; or, the maximum number of attempts is the maximum number of RACH attempts in one RACH process.

[0066] In an embodiment of the present disclosure, the maximum number of attempts configured by the network side device for the terminal is the maximum number of attempts on the first RO resource during a RACH process when the RACH attempt fails or the maximum number of RACH attempts in a RACH process, indicating that the terminal is switched to the RO resource used for subsequent RACH attempts after reaching the configured maximum number of attempts, or the terminal determines based on a received policy or local policy (for example, a predefined condition) that after reaching the configured maximum number of attempts, the RO resource is switched, thereby improving the random access success rate and the performance of random access.

[0067] In some embodiments, the target RACH resource is a first RACH resource, and sending configuration information of the configured target RACH resource to the terminal includes:

[0068] Sending configuration information of the first RACH resource to the terminal; the first RACH resource is used by the terminal to determine the first RO resource and the second RO resource;

[0069] The first RO resource is a valid RO set on SBFD DL symbols in the first RACH resource, and the second RO resource is a valid RO set on SBFD flexible symbols in the first RACH resource and / or a valid RO set on non-SBFD symbols in the first RACH resource.

[0070] In an embodiment of the present disclosure, a network-side device configures a first RACH resource for a terminal and sends configuration information indicating the first RACH resource configured for the terminal to the terminal. Based on the configured first RACH resource, the terminal determines the first RO resource as a valid RO set on SBFD DL symbols in the first RACH resource, and determines the second RO resource as a valid RO set on SBFD flexible symbols in the first RACH resource and / or a valid RO set on non-SBFD symbols in the first RACH resource. Alternatively, based on the first RACH resource, the terminal determines the first RO resource as a valid RO set on SBFD symbols in the first RACH resource, and determines the second RO resource as a valid RO set on non-SBFD symbols in the first RACH resource. Therefore, the first RO resource is a valid RO set on SBFD symbols in the first RACH resource or on SBFD DL symbols in SBFD symbols, and the second RO resource is a valid RO set on SBFD flexible symbols and / or non-SBFD symbols in SBFD symbols in the first RACH resource.

[0071] In some embodiments, the target RACH resource includes a second RACH resource and a third RACH resource, and sending the configuration information of the target RACH resource to the terminal includes:

[0072] Sending configuration information of the second RACH resource and the third RACH resource to the terminal; the second RACH resource is used by the terminal to determine the first RO resource, and the third RACH resource is used by the terminal to determine the second RO resource;

[0073] The first RO resource is a valid RO set on SBFD symbols in the second RACH resource, and the second RO resource is a valid RO set on SBFD flexible symbols in the third RACH resource and / or a valid RO set on non-SBFD symbols in the third RACH resource.

[0074] In an embodiment of the present disclosure, a network-side device configures a second RACH resource and a third RACH resource for a terminal, and sends configuration information indicating the second RACH resource and the third RACH resource configured for the terminal to the terminal. Based on the configured second RACH resource, the terminal determines that the first RO resource is a valid RO set on the SBFD symbol in the second RACH resource. Based on the configured third RACH resource, the terminal determines that the second RO resource is a valid RO set on the SBFD flexible symbols in the SBFD symbols in the third RACH resource and / or a valid RO set on the non-SBFD symbols in the third RACH resource. Therefore, the first RO resource is a valid RO set on the SBFD symbol in the second RACH resource, and the second RO resource is a valid RO set on the SBFD flexible symbols and / or on the non-SBFD symbols in the SBFD symbols in the third RACH resource.

[0075] In some embodiments, the method further comprises:

[0076] Determining indication information, where the indication information is used to indicate an RO resource to be used for the initial RACH attempt in the random access procedure;

[0077] Sending instruction information to the terminal.

[0078] In some embodiments, the determining the indication information includes:

[0079] Determining the indication information through SIB configuration, where the indication information is used to indicate the RO resource to be adopted by the terminal in the initial RACH attempt during the initial random access process;

[0080] The indication information is determined through RRC configuration, where the indication information is used to indicate the RO resource to be adopted by the terminal in the initial RACH attempt during a non-initial random access process.

[0081] In the embodiment of the present disclosure, the network side device configures the indication information of the RO resource adopted by the first RACH attempt of the initial random access process through the SIB, and instructs the terminal to determine the RO resource preferentially adopted by the first RACH attempt of the initial random access process, or the network side device configures the indication information of the RO resource adopted by the first RACH attempt of the non-initial random access process through the RRC, and instructs the terminal to determine the RO resource preferentially adopted by the first RACH attempt of the subsequent random access process, thereby realizing flexible adjustment of the RO resource.

[0082] In some embodiments, the method further comprises:

[0083] determining a threshold configured for the terminal, where the threshold is used by the terminal to determine an RO resource to be used for an initial RACH attempt in a random access procedure;

[0084] The threshold is sent to the terminal.

[0085] In an embodiment of the present disclosure, a network-side device configures a threshold for a terminal and sends indication information including the threshold to the terminal, instructing the terminal to compare the RSRP measurement result corresponding to the reference signal index used in the initial RACH attempt with the threshold, or the terminal to compare the RSRP measurement result of the downlink path loss reference with the threshold, to determine the RO resource to be preferentially used in the initial RACH attempt in the random access process (including initial random access and / or subsequent random access), thereby improving the random access success rate and / or random access performance.

[0086] In some embodiments, the method further comprises:

[0087] Sending threshold indication information to the terminal;

[0088] The threshold indication information is used to indicate: when a comparison result of an RSRP measurement result and the threshold shows that the RSRP measurement result is greater than or equal to the threshold, RO resources to be used in an initial RACH attempt during the random access process; or when a comparison result shows that the RSRP measurement result is less than the threshold, RO resources to be used in an initial RACH attempt during the random access process;

[0089] or,

[0090] The threshold indication information is used to indicate: if the comparison result shows that the RSRP measurement result is greater than the threshold, the RO resource to be used in the initial RACH attempt during the random access process; or if the comparison result shows that the RSRP measurement result is less than or equal to the threshold, the RO resource to be used in the initial RACH attempt during the random access process;

[0091] The RSRP measurement result is an RSRP measurement result corresponding to a reference signal index adopted in an initial RACH attempt; or, the RSRP measurement result is an RSRP measurement result of a downlink path loss reference.

[0092] In the disclosed embodiment, the network side device sends threshold indication information to the terminal, so that the terminal can determine the RO resource to be used for the initial RACH attempt in the random access process according to the threshold indication information and the comparison result of the RSRP measurement result and the threshold, thereby improving the random access success rate and / or random access performance.

[0093] In some embodiments, the RO resource used in the initial RACH attempt during the random access process satisfies any of the following conditions:

[0094] In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource;

[0095] In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource;

[0096] In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource;

[0097] In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource.

[0098] In the embodiment of the present disclosure, when the target RACH resource is the first RACH resource, more RO access opportunities can be increased. When the target RACH resource includes the second RACH resource and the third RACH resource, the long PRACH format can be configured through the second RACH resource to increase coverage performance. The terminal can flexibly select the RO resource for the initial RACH attempt during the random access process for these two different situations, thereby improving the random access success rate and / or random access performance.

[0099] In some embodiments, the method further comprises:

[0100] The preamble sent by the terminal is received on the configured RO resource.

[0101] In a third aspect, the present disclosure provides a random access channel transmission resource selection device, which is applied to a terminal and includes a memory, a transceiver, and a processor:

[0102] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations:

[0103] Determine the target random access channel (RACH) resource configured by the network side device;

[0104] Determine the random access opportunity RO resource to be used for the initial RACH attempt in the random access process based on the target RACH resource, and perform physical random access channel PRACH transmission on the RO resource used for the initial RACH attempt;

[0105] After the predefined conditions are met, subsequent RACH attempts are made by switching RO resources.

[0106] In the embodiment of the present disclosure, the terminal determines to perform PRACH transmission on the RO resource used in the initial RACH attempt by receiving configuration information of the RACH resource configured by the network-side device. If a predefined condition is met (for example, the attempt fails M times, or the interference is relatively large, etc.), the terminal is capable of switching the RO resource to perform random access on a symbol with less interference or easier to successfully access. Based on the RO resource switching capability of the terminal, it can be applicable to terminals that can identify different symbol types, thereby improving the random access success rate and random access performance.

[0107] In some embodiments, the predefined condition is that the number of failed RACH attempts in one RACH process reaches a maximum number of attempts.

[0108] In some embodiments, the maximum number of attempts in the predefined condition is the maximum number of attempts of the terminal on the first RO resource configured by the network side device, and the first RO resource is determined based on the target RACH resource; or

[0109] The maximum number of attempts in the predefined condition is the maximum number of RACH attempts of one RACH process configured by the network side device.

[0110] In the embodiment of the present disclosure, when a RACH attempt fails in one RACH process and reaches the maximum number of attempts on the first RO resource or the maximum number of RACH attempts for one RACH process configured by the network side device, the terminal switches the RO resource used for subsequent RACH attempts, thereby improving the random access success rate and random access performance.

[0111] In some embodiments, the processor is configured to determine, based on the target RACH resource, a random access opportunity (RO) resource to be used for an initial RACH attempt in a random access process, specifically including:

[0112] determining a first RO resource and a second RO resource according to the target RACH resource;

[0113] An RO resource to be used for an initial RACH attempt in a random access procedure is determined from the first RO resource and the second RO resource.

[0114] In the embodiment of the present disclosure, the terminal divides the received target RACH resource into a first RO resource and a second RO resource, and selects the RO resource preferentially used in the initial RACH attempt from the first RO resource and the second RO resource for PRACH transmission, so that access can be performed more easily, thereby improving the success rate of random access.

[0115] In some embodiments, the processor is configured to perform a subsequent RACH attempt by switching RO resources, specifically including:

[0116] If the RO resource used in the initial RACH attempt is the first RO resource, after switching the RO resource, the subsequent RACH attempts use the second RO resource;

[0117] If the RO resource used in the initial RACH attempt is the second RO resource, after the RO resource is switched, the subsequent RACH attempts use the first RO resource.

[0118] In the embodiment of the present disclosure, if the terminal fails in a RACH attempt and reaches the maximum number of attempts during a RACH process, in order to ensure successful access and / or improve random access performance, the RO resource used for subsequent RACH attempts will be switched. For example, the first RACH attempt uses the first RO resource, the RO resource after switching is the second RO resource, and the second RO resource is used in subsequent RACH attempts, or the first RACH attempt uses the second RO resource, the RO resource after switching is the first RO resource, and the first RO resource is used in subsequent RACH attempts.

[0119] In some embodiments, the target RACH resource is a first RACH resource, and the processor is configured to determine the first RO resource and the second RO resource according to the target RACH resource, specifically including:

[0120] Determining a first RO resource and a second RO resource according to the first RACH resource;

[0121] The first RO resource is a valid RO set on a sub-band full-duplex downlink (SBFD) DL symbol in the first RACH resource, and the second RO resource is a valid RO set on a sub-band full-duplex flexible (SBFD) flexible symbol in the first RACH resource and / or a valid RO set on a non-SBFD symbol in the first RACH resource; or

[0122] The first RO resource is a valid RO set on SBFD symbols in the first RACH resource, and the second RO resource is a valid RO set on non-SBFD symbols in the first RACH resource.

[0123] In an embodiment of the present disclosure, a terminal receives information sent by a network-side device indicating a first RACH resource configured for the terminal. Based on the first RACH resource, the terminal determines that the first RO resource is a valid RO set on SBFD DL symbols in the first RACH resource, and determines that the second RO resource is a valid RO set on SBFD flexible symbols in the first RACH resource and / or a valid RO set on non-SBFD symbols in the first RACH resource. Alternatively, based on the first RACH resource, the terminal determines that the first RO resource is a valid RO set on SBFD symbols in the first RACH resource, and determines that the second RO resource is a valid RO set on non-SBFD symbols in the first RACH resource. Therefore, the first RO resource is a valid RO set on SBFD symbols in the first RACH resource or on SBFD DL symbols in SBFD symbols, and the second RO resource is a valid RO set on SBFD flexible symbols and / or non-SBFD symbols in SBFD symbols in the first RACH resource.

[0124] In some embodiments, the target RACH resource includes a second RACH resource and a third RACH resource, and the processor is configured to determine the RO resource and the second RO resource according to the target RACH resource, specifically including:

[0125] Determine the first RO resource according to the second RACH resource, where the first RO resource is a valid RO set on an SBFD symbol in the second RACH resource;

[0126] The second RO resource is determined according to the third RACH resource, where the second RO resource is a valid RO set on SBFD flexible symbols in the third RACH resource and / or a valid RO set on non-SBFD symbols in the third RACH resource.

[0127] In an embodiment of the present disclosure, a terminal receives information sent by a network-side device indicating a second RACH resource and a third RACH resource configured for the terminal. Based on the second RACH resource, the terminal determines that the first RO resource is a valid RO set on SBFD symbols in the second RACH resource. Based on the third RACH resource, the terminal determines that the second RO resource is a valid RO set on SBFD flexible symbols among the SBFD symbols in the third RACH resource and / or a valid RO set on non-SBFD symbols in the third RACH resource. Therefore, the first RO resource is a valid RO set on SBFD symbols in the second RACH resource, and the second RO resource is a valid RO set on SBFD flexible symbols and / or non-SBFD symbols among the SBFD symbols in the third RACH resource.

[0128] In some embodiments, the processor is configured to determine, from the first RO resource and the second RO resource, an RO resource to be used for an initial RACH attempt in a random access process, specifically including any of the following:

[0129] Determine the RO resource to be used for the initial RACH attempt during random access according to the protocol predefined rules;

[0130] Determining, according to the instruction information of the network side device, the RO resource to be used for the initial RACH attempt in the random access process;

[0131] According to the threshold, the RO resource to be used for the initial RACH attempt in the random access process is determined.

[0132] In the disclosed embodiments, a terminal can determine the RO resource to be used for the initial RACH attempt during a random access process in at least three ways: Method 1: When the network side configures the first RO resource, the first RO resource is preferentially used for the first RACH attempt (here, the initial time, i.e., the number of preamble transmissions N is equal to 1); Method 2: The network side device indicates the RO resource to be used for the first RACH attempt; Method 3: The UE determines the RO resource to be used for the first attempt based on a threshold. This achieves diversified RO resource selection methods for the initial RACH attempt.

[0133] In some embodiments, the protocol predefined rule includes: when the network side device configures the first RO resource, the first RO resource is preferentially used in the initial RACH attempt during the random access process.

[0134] In the disclosed embodiment, based on the protocol predefined rules, it can be ensured that the SBFD UE preferentially selects SBFD symbols for random access, thereby reducing contention conflicts and improving the success rate of random access.

[0135] In some embodiments, the indication information includes an RO resource used in an initial RACH attempt during an initial random access process and an RO resource used in an initial RACH attempt during a non-initial random access process;

[0136] The RO resources used in the initial RACH attempt during the initial random access process are configured by the network side device through the system information block SIB, and the RO resources used in the initial RACH attempt during the non-initial random access process are configured by the network side device through the radio resource control RRC.

[0137] In an embodiment of the present disclosure, the terminal may determine the RO resource to be preferentially adopted in the first RACH attempt of the initial random access process based on the indication information of the RO resource to be adopted in the first RACH attempt of the initial random access process configured by the network side device through the SIB, or the terminal may determine the RO resource to be preferentially adopted in the first RACH attempt of the subsequent random access process based on the indication information of the RO resource to be adopted in the first RACH attempt of the non-initial random access process configured by the network side device through the RRC, thereby realizing flexible adjustment of the RO resource.

[0138] In some embodiments, the processor is configured to determine, based on a threshold, an RO resource to be used for an initial RACH attempt in a random access process, specifically including:

[0139] determining, based on a comparison result of the RSRP measurement result and the threshold, an RO resource to be used for an initial RACH attempt in a random access process;

[0140] The RSRP measurement result is an RSRP measurement result corresponding to a reference signal index adopted in an initial RACH attempt; or, the RSRP measurement result is an RSRP measurement result of a downlink path loss reference.

[0141] In an embodiment of the present disclosure, the terminal compares the RSRP measurement result corresponding to the reference signal index used in the initial RACH attempt with the threshold, or the terminal compares the RSRP measurement result of the downlink path loss reference with the threshold, and determines the RO resource to be preferentially used in the initial RACH attempt in the random access process (including initial random access and / or subsequent random access), thereby improving the random access success rate and / or random access performance.

[0142] In some embodiments, the processor is configured to determine, based on a comparison result of a reference signal received power (RSRP) measurement result and the threshold, an RO resource to be used for an initial RACH attempt in a random access process, specifically including:

[0143] determining, according to the threshold indication information of the network-side device and the comparison result, an RO resource to be used for an initial RACH attempt in a random access process;

[0144] The threshold indication information is used to indicate: when the comparison result is that the RSRP measurement result is greater than or equal to the threshold, the RO resource to be used for the initial RACH attempt during the random access process; or, when the comparison result is that the RSRP measurement result is less than the threshold, the RO resource to be used for the initial RACH attempt during the random access process;

[0145] or,

[0146] The threshold indication information is used to indicate: when the comparison result shows that the RSRP measurement result is greater than the threshold, the RO resource to be used in the initial RACH attempt during the random access process; or when the comparison result shows that the RSRP measurement result is less than or equal to the threshold, the RO resource to be used in the initial RACH attempt during the random access process.

[0147] In the embodiment of the present disclosure, the terminal receives threshold indication information from the network side device, thereby being able to determine the RO resource to be used for the initial RACH attempt in the random access process based on the threshold indication information and the comparison result between the RSRP measurement result and the threshold, thereby improving the random access success rate and / or random access performance.

[0148] In some embodiments, the RO resource used in the initial RACH attempt during the random access process satisfies any of the following conditions:

[0149] In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource;

[0150] In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource;

[0151] In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource;

[0152] In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource.

[0153] In the embodiment of the present disclosure, when the target RACH resource is the first RACH resource, more RO access opportunities can be increased. When the target RACH resource includes the second RACH resource and the third RACH resource, the long PRACH format can be configured through the second RACH resource to increase coverage performance. The terminal can flexibly select the RO resource for the initial RACH attempt during the random access process for these two different situations, thereby improving the random access success rate and / or random access performance.

[0154] In a fourth aspect, the present disclosure provides a random access channel transmission resource selection device, which is applied to a network side device, and includes: a memory, a transceiver, and a processor:

[0155] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations:

[0156] Determine a target random access channel RACH resource configured for the terminal;

[0157] The configuration information of the target RACH resource is sent to the terminal, where the target RACH resource is used by the terminal to determine the RO resource to be used for the initial RACH attempt in the random access process, and to perform subsequent RACH attempts by switching the RO resource after a predefined condition is met.

[0158] In an embodiment of the present disclosure, a network-side device configures a target RACH resource for a terminal and sends configuration information of the target RACH resource to the terminal, so that the terminal determines the RACH resource based on the RACH resource location in the configuration information sent by the network-side device, and determines to perform PRACH transmission on the RO resource used in the initial RACH attempt. If a predefined condition is met (for example, M attempts have failed, or interference is relatively large), the terminal is capable of switching the RO resource and performing random access on a symbol with less interference or easier successful access. Based on the RO resource switching capability of the terminal, it can be applicable to terminals that can identify different symbol types, thereby improving the random access success rate and random access performance.

[0159] In some embodiments, the processor is further configured to perform the following operations:

[0160] The predefined condition configured for the terminal is determined, where the predefined condition is that a RACH attempt failure reaches a maximum number of attempts during a RACH process.

[0161] In some embodiments, the maximum number of attempts is the maximum number of attempts of the terminal on a first RO resource, where the first RO resource is determined by the terminal based on the target RACH resource; or, the maximum number of attempts is the maximum number of RACH attempts in one RACH process.

[0162] In an embodiment of the present disclosure, the maximum number of attempts configured by the network side device for the terminal is the maximum number of attempts on the first RO resource during a RACH process when the RACH attempt fails or the maximum number of RACH attempts in a RACH process, indicating that the terminal is switched to the RO resource used for subsequent RACH attempts after reaching the configured maximum number of attempts, or the terminal determines based on a received policy or local policy (for example, a predefined condition) that after reaching the configured maximum number of attempts, the RO resource is switched, thereby improving the random access success rate and the performance of random access.

[0163] In some embodiments, the target RACH resource is a first RACH resource, and the processor is configured to send configuration information of the target RACH resource to the terminal, specifically including:

[0164] Sending configuration information of the first RACH resource to the terminal; the first RACH resource is used by the terminal to determine the first RO resource and the second RO resource;

[0165] The first RO resource is a valid RO set on SBFD DL symbols in the first RACH resource, and the second RO resource is a valid RO set on SBFD flexible symbols in the first RACH resource and / or a valid RO set on non-SBFD symbols in the first RACH resource.

[0166] In an embodiment of the present disclosure, a network-side device configures a first RACH resource for a terminal and sends configuration information indicating the first RACH resource configured for the terminal to the terminal. Based on the configured first RACH resource, the terminal determines the first RO resource as a valid RO set on SBFD DL symbols in the first RACH resource, and determines the second RO resource as a valid RO set on SBFD flexible symbols in the first RACH resource and / or a valid RO set on non-SBFD symbols in the first RACH resource. Alternatively, based on the first RACH resource, the terminal determines the first RO resource as a valid RO set on SBFD symbols in the first RACH resource, and determines the second RO resource as a valid RO set on non-SBFD symbols in the first RACH resource. Therefore, the first RO resource is a valid RO set on SBFD symbols in the first RACH resource or on SBFD DL symbols in SBFD symbols, and the second RO resource is a valid RO set on SBFD flexible symbols and / or non-SBFD symbols in SBFD symbols in the first RACH resource.

[0167] In some embodiments, the target RACH resource includes a second RACH resource and a third RACH resource, and the processor is configured to send configuration information of the target RACH resource to the terminal, specifically including:

[0168] Sending configuration information of the second RACH resource and the third RACH resource to the terminal; the second RACH resource is used by the terminal to determine the first RO resource, and the third RACH resource is used by the terminal to determine the second RO resource;

[0169] The first RO resource is a valid RO set on SBFD symbols in the second RACH resource, and the second RO resource is a valid RO set on SBFD flexible symbols in the third RACH resource and / or a valid RO set on non-SBFD symbols in the third RACH resource.

[0170] In the disclosed embodiment, configuration information indicating the second RACH resource and the third RACH resource configured for the terminal is sent to the terminal. The terminal determines, based on the configured second RACH resource, that the first RO resource is a valid RO set on the SBFD symbols in the second RACH resource. The terminal determines, based on the configured third RACH resource, that the second RO resource is a valid RO set on the SBFD flexible symbols in the SBFD symbols in the third RACH resource and / or a valid RO set on the non-SBFD symbols in the third RACH resource. Therefore, the first RO resource is a valid RO set on the SBFD symbols in the second RACH resource, and the second RO resource is a valid RO set on the SBFD flexible symbols and / or on the non-SBFD symbols in the SBFD symbols in the third RACH resource.

[0171] In some embodiments, the processor is further configured to perform the following operations:

[0172] Determining indication information, where the indication information is used to indicate an RO resource to be used for the initial RACH attempt in the random access procedure;

[0173] Sending instruction information to the terminal.

[0174] In some embodiments, the processor is configured to determine the indication information, specifically including:

[0175] Determining the indication information through SIB configuration, where the indication information is used to indicate the RO resource to be adopted by the terminal in the initial RACH attempt during the initial random access process;

[0176] The indication information is determined through RRC configuration, where the indication information is used to indicate the RO resource to be adopted by the terminal in the initial RACH attempt during a non-initial random access process.

[0177] In the embodiment of the present disclosure, the network side device configures the indication information of the RO resource adopted by the first RACH attempt of the initial random access process through the SIB, and instructs the terminal to determine the RO resource preferentially adopted by the first RACH attempt of the initial random access process, or the network side device configures the indication information of the RO resource adopted by the first RACH attempt of the non-initial random access process through the RRC, and instructs the terminal to determine the RO resource preferentially adopted by the first RACH attempt of the subsequent random access process, thereby realizing flexible adjustment of the RO resource.

[0178] In some embodiments, the processor is further configured to perform the following operations:

[0179] determining a threshold configured for the terminal, where the threshold is used by the terminal to determine an RO resource to be used for an initial RACH attempt in a random access procedure;

[0180] The threshold is sent to the terminal.

[0181] In an embodiment of the present disclosure, a network-side device configures a threshold for a terminal and sends indication information including the threshold to the terminal, instructing the terminal to compare the RSRP measurement result corresponding to the reference signal index used in the initial RACH attempt with the threshold, or the terminal to compare the RSRP measurement result of the downlink path loss reference with the threshold, to determine the RO resource to be preferentially used in the initial RACH attempt in the random access process (including initial random access and / or subsequent random access), thereby improving the random access success rate and / or random access performance.

[0182] In some embodiments, the processor is further configured to perform the following operations:

[0183] Sending threshold indication information to the terminal;

[0184] The threshold indication information is used to indicate: when a comparison result of an RSRP measurement result and the threshold shows that the RSRP measurement result is greater than or equal to the threshold, RO resources to be used in an initial RACH attempt during the random access process; or when a comparison result shows that the RSRP measurement result is less than the threshold, RO resources to be used in an initial RACH attempt during the random access process;

[0185] or,

[0186] The threshold indication information is used to indicate: if the comparison result shows that the RSRP measurement result is greater than the threshold, the RO resource to be used in the initial RACH attempt during the random access process; or if the comparison result shows that the RSRP measurement result is less than or equal to the threshold, the RO resource to be used in the initial RACH attempt during the random access process;

[0187] The RSRP measurement result is an RSRP measurement result corresponding to a reference signal index adopted in an initial RACH attempt; or, the RSRP measurement result is an RSRP measurement result of a downlink path loss reference.

[0188] In the disclosed embodiment, the network side device sends threshold indication information to the terminal, so that the terminal can determine the RO resource to be used for the initial RACH attempt in the random access process according to the threshold indication information and the comparison result of the RSRP measurement result and the threshold, thereby improving the random access success rate and / or random access performance.

[0189] In some embodiments, the RO resource used in the initial RACH attempt during the random access process satisfies any of the following conditions:

[0190] In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource;

[0191] In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource;

[0192] In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource;

[0193] In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource.

[0194] In the embodiment of the present disclosure, when the target RACH resource is the first RACH resource, more RO access opportunities can be increased. When the target RACH resource includes the second RACH resource and the third RACH resource, the long PRACH format can be configured through the second RACH resource to increase coverage performance. The terminal can flexibly select the RO resource for the initial RACH attempt during the random access process for these two different situations, thereby improving the random access success rate and / or random access performance.

[0195] In some embodiments, the processor is further configured to perform the following operations:

[0196] The preamble sent by the terminal is received on the configured RO resource.

[0197] In a fifth aspect, the present disclosure provides a random access channel transmission resource selection device, which is applied to a terminal and includes:

[0198] A first determining unit is configured to determine a target random access channel RACH resource configured by a network side device;

[0199] A second determining unit is configured to determine, based on the target RACH resource, a random access opportunity RO resource to be used in an initial RACH attempt during a random access process, and perform a physical random access channel PRACH transmission on the RO resource used in the initial RACH attempt;

[0200] The switching unit is configured to perform a subsequent RACH attempt by switching RO resources after a predefined condition is met.

[0201] In the embodiment of the present disclosure, the terminal determines to perform PRACH transmission on the RO resource used in the initial RACH attempt by receiving configuration information of the RACH resource configured by the network-side device. If a predefined condition is met (for example, the attempt fails M times, or the interference is relatively large, etc.), the terminal is capable of switching the RO resource to perform random access on a symbol with less interference or easier to successfully access. Based on the RO resource switching capability of the terminal, it can be applicable to terminals that can identify different symbol types, thereby improving the random access success rate and random access performance.

[0202] In some embodiments, the predefined condition is that the number of failed RACH attempts in one RACH process reaches a maximum number of attempts.

[0203] In some embodiments, the maximum number of attempts in the predefined condition is the maximum number of attempts of the terminal on the first RO resource configured by the network side device, and the first RO resource is determined based on the target RACH resource; or

[0204] The maximum number of attempts in the predefined condition is the maximum number of RACH attempts of one RACH process configured by the network side device.

[0205] In the embodiment of the present disclosure, when a RACH attempt fails in one RACH process and reaches the maximum number of attempts on the first RO resource or the maximum number of RACH attempts for one RACH process configured by the network side device, the terminal switches the RO resource used for subsequent RACH attempts, thereby improving the random access success rate and random access performance.

[0206] In some embodiments, the second determining unit is specifically configured to:

[0207] determining a first RO resource and a second RO resource according to the target RACH resource;

[0208] An RO resource to be used for an initial RACH attempt in a random access procedure is determined from the first RO resource and the second RO resource.

[0209] In the embodiment of the present disclosure, the terminal divides the received target RACH resource into a first RO resource and a second RO resource, and selects the RO resource preferentially used in the initial RACH attempt from the first RO resource and the second RO resource for PRACH transmission, so that access can be performed more easily, thereby improving the success rate of random access.

[0210] In some embodiments, the switching unit is specifically configured to:

[0211] When the RO resource used in the initial RACH attempt is the first RO resource, after the RO resource is switched, the subsequent RACH attempt uses the second RO resource;

[0212] When the RO resource used in the initial RACH attempt is the second RO resource, after the RO resource is switched, the subsequent RACH attempts use the first RO resource.

[0213] In the embodiment of the present disclosure, if the terminal fails in a RACH attempt and reaches the maximum number of attempts during a RACH process, in order to ensure successful access and / or improve random access performance, the RO resource used for subsequent RACH attempts will be switched. For example, the first RACH attempt uses the first RO resource, the RO resource after switching is the second RO resource, and the second RO resource is used in subsequent RACH attempts, or the first RACH attempt uses the second RO resource, the RO resource after switching is the first RO resource, and the first RO resource is used in subsequent RACH attempts.

[0214] In some embodiments, the target RACH resource is a first RACH resource, and the second determining unit is specifically configured to:

[0215] Determining a first RO resource and a second RO resource according to the first RACH resource;

[0216] The first RO resource is a valid RO set on a sub-band full-duplex downlink (SBFD) DL symbol in the first RACH resource, and the second RO resource is a valid RO set on a sub-band full-duplex flexible (SBFD) flexible symbol in the first RACH resource and / or a valid RO set on a non-SBFD symbol in the first RACH resource; or

[0217] The first RO resource is a valid RO set on SBFD symbols in the first RACH resource, and the second RO resource is a valid RO set on non-SBFD symbols in the first RACH resource.

[0218] In an embodiment of the present disclosure, a terminal receives information sent by a network-side device indicating a first RACH resource configured for the terminal. Based on the first RACH resource, the terminal determines that the first RO resource is a valid RO set on SBFD DL symbols in the first RACH resource, and determines that the second RO resource is a valid RO set on SBFD flexible symbols in the first RACH resource and / or a valid RO set on non-SBFD symbols in the first RACH resource. Alternatively, based on the first RACH resource, the terminal determines that the first RO resource is a valid RO set on SBFD symbols in the first RACH resource, and determines that the second RO resource is a valid RO set on non-SBFD symbols in the first RACH resource. Therefore, the first RO resource is a valid RO set on SBFD symbols in the first RACH resource or on SBFD DL symbols in SBFD symbols, and the second RO resource is a valid RO set on SBFD flexible symbols and / or non-SBFD symbols in SBFD symbols in the first RACH resource.

[0219] In some embodiments, the target RACH resource includes a second RACH resource and a third RACH resource, and the second determining unit is specifically configured to:

[0220] Determine the first RO resource according to the second RACH resource, where the first RO resource is a valid RO set on an SBFD symbol in the second RACH resource;

[0221] The second RO resource is determined according to the third RACH resource, where the second RO resource is a valid RO set on SBFD flexible symbols in the third RACH resource and / or a valid RO set on non-SBFD symbols in the third RACH resource.

[0222] In an embodiment of the present disclosure, a terminal receives information sent by a network-side device indicating a second RACH resource and a third RACH resource configured for the terminal. Based on the second RACH resource, the terminal determines that the first RO resource is a valid RO set on SBFD symbols in the second RACH resource. Based on the third RACH resource, the terminal determines that the second RO resource is a valid RO set on SBFD flexible symbols among the SBFD symbols in the third RACH resource and / or a valid RO set on non-SBFD symbols in the third RACH resource. Therefore, the first RO resource is a valid RO set on SBFD symbols in the second RACH resource, and the second RO resource is a valid RO set on SBFD flexible symbols and / or non-SBFD symbols among the SBFD symbols in the third RACH resource.

[0223] In some embodiments, the second determining unit is specifically configured to perform any of the following:

[0224] Determine the RO resource to be used for the initial RACH attempt during random access according to the protocol predefined rules;

[0225] Determining, according to the instruction information of the network side device, the RO resource to be used for the initial RACH attempt in the random access process;

[0226] According to the threshold, the RO resource to be used for the initial RACH attempt in the random access process is determined.

[0227] In the disclosed embodiments, a terminal can determine the RO resource to be used for the initial RACH attempt during a random access process in at least three ways: Method 1: When the network side configures the first RO resource, the first RO resource is preferentially used for the first RACH attempt (here, the initial time, i.e., the number of preamble transmissions N is equal to 1); Method 2: The network side device indicates the RO resource to be used for the first RACH attempt; Method 3: The UE determines the RO resource to be used for the first attempt based on a threshold. This achieves diversified RO resource selection methods for the initial RACH attempt.

[0228] In some embodiments, the protocol predefined rule includes: when the network side device configures the first RO resource, the first RO resource is preferentially used in the initial RACH attempt during the random access process.

[0229] In the disclosed embodiment, based on the protocol predefined rules, it can be ensured that the SBFD UE preferentially selects SBFD symbols for random access, thereby reducing contention conflicts and improving the success rate of random access.

[0230] In some embodiments, the indication information includes an RO resource used in an initial RACH attempt during an initial random access process and an RO resource used in an initial RACH attempt during a non-initial random access process;

[0231] The RO resources used in the initial RACH attempt during the initial random access process are configured by the network side device through the system information block SIB, and the RO resources used in the initial RACH attempt during the non-initial random access process are configured by the network side device through the radio resource control RRC.

[0232] In an embodiment of the present disclosure, the terminal may determine the RO resource to be preferentially adopted in the first RACH attempt of the initial random access process based on the indication information of the RO resource to be adopted in the first RACH attempt of the initial random access process configured by the network side device through the SIB, or the terminal may determine the RO resource to be preferentially adopted in the first RACH attempt of the subsequent random access process based on the indication information of the RO resource to be adopted in the first RACH attempt of the non-initial random access process configured by the network side device through the RRC, thereby realizing flexible adjustment of the RO resource.

[0233] In some embodiments, the second determining unit is specifically configured to:

[0234] determining, based on a comparison result of the RSRP measurement result and the threshold, an RO resource to be used for an initial RACH attempt in a random access process;

[0235] The RSRP measurement result is an RSRP measurement result corresponding to a reference signal index adopted in an initial RACH attempt; or, the RSRP measurement result is an RSRP measurement result of a downlink path loss reference.

[0236] In an embodiment of the present disclosure, the terminal compares the RSRP measurement result corresponding to the reference signal index used in the initial RACH attempt with the threshold, or the terminal compares the RSRP measurement result of the downlink path loss reference with the threshold, and determines the RO resource to be preferentially used in the initial RACH attempt in the random access process (including initial random access and / or subsequent random access), thereby improving the random access success rate and / or random access performance.

[0237] In some embodiments, the second determining unit is specifically configured to:

[0238] determining, according to the threshold indication information of the network-side device and the comparison result, an RO resource to be used for an initial RACH attempt in a random access process;

[0239] The threshold indication information is used to indicate: when the comparison result is that the RSRP measurement result is greater than or equal to the threshold, the RO resource to be used for the initial RACH attempt during the random access process; or, when the comparison result is that the RSRP measurement result is less than the threshold, the RO resource to be used for the initial RACH attempt during the random access process;

[0240] or,

[0241] The threshold indication information is used to indicate: when the comparison result shows that the RSRP measurement result is greater than the threshold, the RO resource to be used in the initial RACH attempt during the random access process; or when the comparison result shows that the RSRP measurement result is less than or equal to the threshold, the RO resource to be used in the initial RACH attempt during the random access process.

[0242] In the embodiment of the present disclosure, the terminal receives threshold indication information from the network side device, thereby being able to determine the RO resource to be used for the initial RACH attempt in the random access process based on the threshold indication information and the comparison result between the RSRP measurement result and the threshold, thereby improving the random access success rate and / or random access performance.

[0243] In some embodiments, the RO resource used in the initial RACH attempt during the random access process satisfies any of the following conditions:

[0244] In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource;

[0245] In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource;

[0246] In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource;

[0247] In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource.

[0248] In the embodiment of the present disclosure, when the target RACH resource is the first RACH resource, more RO access opportunities can be increased. When the target RACH resource includes the second RACH resource and the third RACH resource, the long PRACH format can be configured through the second RACH resource to increase coverage performance. The terminal can flexibly select the RO resource for the initial RACH attempt during the random access process for these two different situations, thereby improving the random access success rate and / or random access performance.

[0249] In a sixth aspect, the present disclosure provides a random access channel transmission resource selection device, the device being applied to a network-side device, the device comprising:

[0250] a determining unit, configured to determine a target random access channel RACH resource configured for the terminal;

[0251] The sending unit is configured to send configuration information of a target RACH resource to the terminal, where the target RACH resource is used by the terminal to determine an RO resource to be used for an initial RACH attempt during a random access process, and to perform subsequent RACH attempts by switching the RO resource after a predefined condition is met.

[0252] In an embodiment of the present disclosure, a network-side device configures a target RACH resource for a terminal and sends configuration information of the target RACH resource to the terminal, so that the terminal determines the RACH resource based on the RACH resource location in the configuration information sent by the network-side device, and determines to perform PRACH transmission on the RO resource used in the initial RACH attempt. If a predefined condition is met (for example, M attempts have failed, or interference is relatively large), the terminal is capable of switching the RO resource and performing random access on a symbol with less interference or easier successful access. Based on the RO resource switching capability of the terminal, it can be applicable to terminals that can identify different symbol types, thereby improving the random access success rate and random access performance.

[0253] In some embodiments, the determining unit is further configured to:

[0254] A maximum number of attempts configured for the terminal is determined.

[0255] In some embodiments, the maximum number of attempts is the maximum number of attempts of the terminal on a first RO resource, where the first RO resource is determined by the terminal based on the target RACH resource; or, the maximum number of attempts is the maximum number of RACH attempts in one RACH process.

[0256] In an embodiment of the present disclosure, the maximum number of attempts configured by the network side device for the terminal is the maximum number of attempts on the first RO resource during a RACH process when the RACH attempt fails or the maximum number of RACH attempts in a RACH process, indicating that the terminal is switched to the RO resource used for subsequent RACH attempts after reaching the configured maximum number of attempts, or the terminal determines based on a received policy or local policy (for example, a predefined condition) that after reaching the configured maximum number of attempts, the RO resource is switched, thereby improving the random access success rate and the performance of random access.

[0257] In some embodiments, the target RACH resource is a first RACH resource, and the sending unit is specifically configured to:

[0258] Sending configuration information of the first RACH resource to the terminal; the first RACH resource is used by the terminal to determine the first RO resource and the second RO resource;

[0259] The first RO resource is a valid RO set on SBFD DL symbols in the first RACH resource, and the second RO resource is a valid RO set on SBFD flexible symbols in the first RACH resource and / or a valid RO set on non-SBFD symbols in the first RACH resource.

[0260] In an embodiment of the present disclosure, a network-side device configures a first RACH resource for a terminal and sends configuration information indicating the first RACH resource configured for the terminal to the terminal. Based on the configured first RACH resource, the terminal determines the first RO resource as a valid RO set on SBFD DL symbols in the first RACH resource, and determines the second RO resource as a valid RO set on SBFD flexible symbols in the first RACH resource and / or a valid RO set on non-SBFD symbols in the first RACH resource. Alternatively, based on the first RACH resource, the terminal determines the first RO resource as a valid RO set on SBFD symbols in the first RACH resource, and determines the second RO resource as a valid RO set on non-SBFD symbols in the first RACH resource. Therefore, the first RO resource is a valid RO set on SBFD symbols in the first RACH resource or on SBFD DL symbols in SBFD symbols, and the second RO resource is a valid RO set on SBFD flexible symbols and / or non-SBFD symbols in SBFD symbols in the first RACH resource.

[0261] In some embodiments, the target RACH resource includes a second RACH resource and a third RACH resource, and the sending unit is specifically configured to:

[0262] Sending configuration information of the second RACH resource and the third RACH resource to the terminal; the second RACH resource is used by the terminal to determine the first RO resource, and the third RACH resource is used by the terminal to determine the second RO resource;

[0263] The first RO resource is a valid RO set on SBFD symbols in the second RACH resource, and the second RO resource is a valid RO set on SBFD flexible symbols in the third RACH resource and / or a valid RO set on non-SBFD symbols in the third RACH resource.

[0264] In an embodiment of the present disclosure, a network-side device configures a second RACH resource and a third RACH resource for a terminal, and sends configuration information indicating the second RACH resource and the third RACH resource configured for the terminal to the terminal. Based on the configured second RACH resource, the terminal determines that the first RO resource is a valid RO set on the SBFD symbol in the second RACH resource. Based on the configured third RACH resource, the terminal determines that the second RO resource is a valid RO set on the SBFD flexible symbols in the SBFD symbols in the third RACH resource and / or a valid RO set on the non-SBFD symbols in the third RACH resource. Therefore, the first RO resource is a valid RO set on the SBFD symbol in the second RACH resource, and the second RO resource is a valid RO set on the SBFD flexible symbols and / or on the non-SBFD symbols in the SBFD symbols in the third RACH resource.

[0265] In some embodiments, the determining unit is further configured to:

[0266] Determining indication information, where the indication information is used to indicate an RO resource to be used for the initial RACH attempt in the random access procedure;

[0267] Sending instruction information to the terminal.

[0268] In some embodiments, the determining unit is specifically configured to:

[0269] Determining the indication information through SIB configuration, where the indication information is used to indicate the RO resource to be adopted by the terminal in the initial RACH attempt during the initial random access process;

[0270] The indication information is determined through RRC configuration, where the indication information is used to indicate the RO resource to be adopted by the terminal in the initial RACH attempt during a non-initial random access process.

[0271] In the embodiment of the present disclosure, the network side device configures the indication information of the RO resource adopted by the first RACH attempt of the initial random access process through the SIB, and instructs the terminal to determine the RO resource preferentially adopted by the first RACH attempt of the initial random access process, or the network side device configures the indication information of the RO resource adopted by the first RACH attempt of the non-initial random access process through the RRC, and instructs the terminal to determine the RO resource preferentially adopted by the first RACH attempt of the subsequent random access process, thereby realizing flexible adjustment of the RO resource.

[0272] In some embodiments, the determining unit is further configured to:

[0273] determining a threshold configured for the terminal, where the threshold is used by the terminal to determine an RO resource to be used for an initial RACH attempt in a random access procedure;

[0274] The threshold is sent to the terminal.

[0275] In an embodiment of the present disclosure, a network-side device configures a threshold for a terminal and sends indication information including the threshold to the terminal, instructing the terminal to compare the RSRP measurement result corresponding to the reference signal index used in the initial RACH attempt with the threshold, or the terminal to compare the RSRP measurement result of the downlink path loss reference with the threshold, to determine the RO resource to be preferentially used in the initial RACH attempt in the random access process (including initial random access and / or subsequent random access), thereby improving the random access success rate and / or random access performance.

[0276] In some embodiments, the sending unit is further configured to:

[0277] Sending threshold indication information to the terminal;

[0278] The threshold indication information is used to indicate: when a comparison result of an RSRP measurement result and the threshold shows that the RSRP measurement result is greater than or equal to the threshold, RO resources to be used in an initial RACH attempt during the random access process; or when a comparison result shows that the RSRP measurement result is less than the threshold, RO resources to be used in an initial RACH attempt during the random access process;

[0279] or,

[0280] The threshold indication information is used to indicate: if the comparison result shows that the RSRP measurement result is greater than the threshold, the RO resource to be used in the initial RACH attempt during the random access process; or if the comparison result shows that the RSRP measurement result is less than or equal to the threshold, the RO resource to be used in the initial RACH attempt during the random access process;

[0281] The RSRP measurement result is an RSRP measurement result corresponding to a reference signal index adopted in an initial RACH attempt; or, the RSRP measurement result is an RSRP measurement result of a downlink path loss reference.

[0282] In the disclosed embodiment, the network side device sends threshold indication information to the terminal, so that the terminal can determine the RO resource to be used for the initial RACH attempt in the random access process according to the threshold indication information and the comparison result of the RSRP measurement result and the threshold, thereby improving the random access success rate and / or random access performance.

[0283] In some embodiments, the RO resource used in the initial RACH attempt during the random access process satisfies any of the following conditions:

[0284] In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource;

[0285] In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource;

[0286] In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource;

[0287] In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource.

[0288] In the embodiment of the present disclosure, when the target RACH resource is the first RACH resource, more RO access opportunities can be increased. When the target RACH resource includes the second RACH resource and the third RACH resource, the long PRACH format can be configured through the second RACH resource to increase coverage performance. The terminal can flexibly select the RO resource for the initial RACH attempt during the random access process for these two different situations, thereby improving the random access success rate and / or random access performance.

[0289] In some embodiments, the apparatus further includes: a receiving unit; the receiving unit is configured to receive a preamble sent by the terminal on the configured RO resource.

[0290] In a seventh aspect, the present disclosure provides a processor-readable storage medium, wherein the processor-readable storage medium stores a computer program, and the computer program is used to enable the processor to execute the method described in any one of the first aspect or the second aspect.

[0291] The present disclosure provides a random access channel transmission resource selection method, apparatus, and readable storage medium. The method determines a target RACH resource configured by a network-side device, and based on the target RACH resource, determines a random access opportunity (RO) resource to be used in an initial RACH attempt during a random access process. Physical random access channel (PRACH) transmission is performed on the RO resource used in the initial RACH attempt. After predefined conditions are met, subsequent RACH attempts are performed by switching the RO resource. Therefore, a terminal is enabled to switch RO resources and perform RO resource switching. When the predefined conditions are met, subsequent RACH attempts are performed by switching the RO resource, thereby improving random access performance.

[0292] It should be understood that the contents described in the above summary of the invention are not intended to limit the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become easier to understand through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0293] FIG1 is a schematic diagram of a flow chart of a method for selecting a random access channel transmission resource according to an embodiment of the present disclosure;

[0294] FIG2 is a first schematic diagram of RACH resource configuration provided by an embodiment of the present disclosure;

[0295] FIG3 is a second schematic diagram of RACH resource configuration provided by an embodiment of the present disclosure;

[0296] FIG4A is a third schematic diagram of RACH resource configuration provided by an embodiment of the present disclosure;

[0297] FIG4B is a fourth schematic diagram of RACH resource configuration provided by an embodiment of the present disclosure;

[0298] FIG5A is a fifth schematic diagram of RACH resource configuration provided by an embodiment of the present disclosure;

[0299] FIG5B is a sixth schematic diagram of RACH resource configuration provided by an embodiment of the present disclosure;

[0300] FIG6A is a seventh schematic diagram of RACH resource configuration provided by an embodiment of the present disclosure;

[0301] FIG6B is a schematic diagram eight of RACH resource configuration provided by an embodiment of the present disclosure;

[0302] FIG7 is a ninth schematic diagram of RACH resource configuration provided by an embodiment of the present disclosure;

[0303] FIG8 is a schematic diagram of a flow chart of a method for selecting a random access channel transmission resource according to another embodiment of the present disclosure;

[0304] FIG9 is a first structural diagram of a random access channel transmission resource selection apparatus provided by an embodiment of the present disclosure;

[0305] FIG10 is a second structural diagram of a random access channel transmission resource selection device provided in an embodiment of the present disclosure;

[0306] FIG11 is a third structural diagram of a random access channel transmission resource selection device provided in an embodiment of the present disclosure;

[0307] FIG12 is a fourth structural diagram of the random access channel transmission resource selection device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0308] In this disclosure, the term "and / or" describes the relationship between associated objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0309] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure and not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0310] In order to clearly understand the technical solutions of the present disclosure, the solutions of related technologies are first introduced in detail.

[0311] When an SBFD system uses both SBFD and non-SBFD symbols, only SBFD UEs can transmit on the physical random access channel (PARC) in SBFD symbols. In this case, contention-based random access has a lower collision probability, making access more likely. However, adjacent channel interference on SBFD symbols is greater, potentially impacting random access performance. Conversely, non-SBFD symbols have less interference, but more UEs contend for access and a higher collision probability.

[0312] Since the related art does not have two symbol types and does not require resource selection or resource switching between different symbol types, when different symbol types exist, selecting PRACH transmission opportunities through the related art cannot guarantee that SBFD symbol transmission is preferred.

[0313] Therefore, in the related art, a terminal that can identify different symbol types cannot select resources used for PRACH transmission based on the symbol type, and thus cannot guarantee the performance of random access.

[0314] Therefore, based on the above research, the random access channel transmission resource selection method, device and readable storage medium proposed in the present disclosure are proposed. In the present disclosure, the terminal determines to perform PRACH transmission on the RO resource used in the initial RACH attempt (for example, giving priority to the first RO resource) by receiving the configuration information of the RACH resource configured by the network-side device. If the predefined conditions are met (for example, the attempt fails M times, or the interference is relatively large, etc.), the terminal can have the ability to switch the RO resource and perform random access on the symbol with less interference or easier to successfully access. Based on the RO resource switching capability of the terminal, it can be applicable to terminals that can identify different symbol types, thereby improving the random access success rate and random access performance.

[0315] Among them, the method and the device are based on the same application concept. Since the principles of solving problems by the method and the device are similar, the implementation of the device and the method can refer to each other, and the repeated parts will not be repeated.

[0316] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0317] Referring to Figure 1 , which is a schematic flow diagram of a random access channel transmission resource selection method according to an embodiment of the present disclosure, the method is performed by a terminal, such as a user equipment (UE). The following describes the method in detail using a sub-band full-duplex terminal (i.e., an SBFD UE) as an example.

[0318] The random access channel transmission resource selection method provided by the embodiment of the present disclosure includes the following steps:

[0319] Step 101: Determine the target random access channel RACH resource configured by the network side device.

[0320] The target RACH resource may be a first RACH resource, or may include a second RACH resource and a third RACH resource. The first RACH resource may be the same as or different from the second RACH resource or the third RACH resource, depending on the specific scenario and is not specifically limited here.

[0321] The terminal may receive configuration information sent by the network side device, where the configuration information is used to indicate the target RACH resource location configured by the network side device for the terminal (the resource location here refers to the time-frequency domain resource location).

[0322] Step 102: Determine the random access opportunity RO resource used in the initial RACH attempt during the random access process based on the target RACH resource, and perform physical random access channel PRACH transmission on the RO resource used in the initial RACH attempt.

[0323] The terminal may determine the target RACH resource based on the target RACH resource position in the configuration information.

[0324] Step 103: After the predefined conditions are met, a subsequent RACH attempt is performed by switching RO resources.

[0325] The initial RACH attempt refers to the process of attempting RACH access for the first time in a random access process.

[0326] Specifically, the SBFD UE determines the RO resource to be used for the initial RACH attempt during the random access process based on the target RACH resource, and performs PRACH transmission on the RO resource. When certain conditions (predefined conditions) are met, it switches to other RO resources for PRACH transmission.

[0327] In the embodiment of the present disclosure, the terminal determines to perform PRACH transmission on the RO resource used in the initial RACH attempt by receiving the configuration information of the RACH resource sent by the network-side device. If a predefined condition is met (for example, the attempt fails M times, or the interference is relatively large, etc.), the terminal is capable of switching the RO resource to perform random access on a symbol with less interference or easier to successfully access. Based on the RO resource switching capability of the terminal, it can be applicable to terminals that can identify different symbol types, thereby improving the random access success rate and random access performance.

[0328] In some embodiments, the predefined condition is that the number of failed RACH attempts in one RACH process reaches a maximum number of attempts.

[0329] The predefined condition here is that the number of RACH attempts fails reaches the maximum number of attempts, that is, the number of RACH attempts fails reaches the maximum number of attempts. In some embodiments, the maximum number of attempts in the predefined condition is the maximum number of attempts of the terminal on the first RO resource configured by the network side device, and the first RO resource is determined based on the target RACH resource; or

[0330] The maximum number of attempts in the predefined condition is the maximum number of RACH attempts of one RACH process configured by the network side device.

[0331] Among them, the maximum number of attempts can be configured by the network side device, and the maximum number of attempts can be configured by the network side device in the configuration information, and the configuration information including the maximum number of attempts and the target RACH resource location is sent to the terminal. The configuration information here can be carried by a first message or a first signaling; or, the maximum number of attempts can be carried by a second message or a second signaling. In addition to sending the configuration information including the target RACH resource location to the terminal, the network side device can also send a second message or second signaling carrying the maximum number of attempts to the terminal.

[0332] It should be noted that the specific bearer and sending or receiving method of the configured target RACH resource location and the maximum number of attempts are not specifically limited here. The threshold and indication information configured by the following network-side device are similar to the maximum number of attempts and are not repeated here.

[0333] In the embodiment of the present disclosure, when a RACH attempt fails in one RACH process and reaches the maximum number of attempts on the first RO resource or the maximum number of RACH attempts for one RACH process configured by the network side device, the terminal switches the RO resource used for subsequent RACH attempts, thereby improving the random access success rate and random access performance.

[0334] In some embodiments, the performing a subsequent RACH attempt by switching RO resources includes:

[0335] If the RO resource used in the initial RACH attempt is the first RO resource, after switching the RO resource, the subsequent RACH attempts use the second RO resource;

[0336] If the RO resource used in the initial RACH attempt is the second RO resource, after the RO resource is switched, the subsequent RACH attempts use the first RO resource.

[0337] In the embodiment of the present disclosure, if the terminal fails in a RACH attempt and reaches the maximum number of attempts during a RACH process, in order to ensure successful access and / or improve random access performance, the RO resource used in subsequent RACH attempts will be switched. For example, the first RACH attempt uses the first RO resource, the RO resource after switching is the second RO resource, and the second RO resource is used in subsequent RACH attempts, or the second RO resource is used in the first RACH attempt, the RO resource after switching is the first RO resource, and the first RO resource is used in subsequent RACH attempts.

[0338] In some embodiments, determining the RO resource to be used for the initial RACH attempt in the random access process from the first RO resource and the second RO resource includes any of the following:

[0339] Determine the RO resource to be used for the initial RACH attempt during random access according to the protocol predefined rules;

[0340] Determining, according to the instruction information of the network side device, the RO resource to be used for the initial RACH attempt in the random access process;

[0341] According to the threshold, the RO resource to be used for the initial RACH attempt in the random access process is determined.

[0342] In the disclosed embodiments, the terminal can determine the RO resource to be used in the initial RACH attempt during the random access process in at least three ways (i.e., the UE determines the RO resource to be used in the first RACH attempt according to any of the following rules): Method 1 (Rule 1): When the network side configures the first RO resource, the first RO resource is preferentially used in the first RACH attempt (here, the first time, i.e., the number of preamble transmissions N is equal to 1); Method 2 (Rule 2): The network side device indicates the RO resource to be used in the first RACH attempt; Method 3 (Rule 3): The UE determines the RO resource to be used in the first attempt based on a threshold. This achieves diversified RO resource selection methods for the initial RACH attempt.

[0343] In some embodiments, if the network side device sends indication information to the terminal to indicate the RO resource to be used for the initial RACH attempt during the random access process, the terminal may determine the RO resource to be used for the initial RACH attempt during the random access process according to method 2. If the network side device does not send the indication information to the terminal, the terminal may determine the RO resource to be used for the initial RACH attempt during the random access process according to method 1.

[0344] In some embodiments, if the network side device configures the threshold for the terminal, the terminal can determine the RO resource to be used for the initial RACH attempt during the random access process according to method 3. If the network side device does not configure the threshold for the terminal, the terminal can determine the RO resource to be used for the initial RACH attempt during the random access process according to method 1.

[0345] In some embodiments, the protocol predefined rule includes: when the network side device configures the first RO resource, the first RO resource is preferentially used in the initial RACH attempt during the random access process.

[0346] In the disclosed embodiment, the protocol predefines that when the network configures a first RO resource, the first RACH attempt will preferentially use the first RO resource. Therefore, based on the protocol predefines rules, SBFD UEs can prioritize SBFD symbols for random access, reducing contention and improving the success rate of random access.

[0347] In some embodiments, the indication information includes an RO resource used in an initial RACH attempt during an initial random access process and an RO resource used in an initial RACH attempt during a non-initial random access process;

[0348] The RO resources used in the initial RACH attempt during the initial random access process are configured by the network side device through the system information block SIB, and the RO resources used in the initial RACH attempt during the non-initial random access process are configured by the network side device through the radio resource control RRC.

[0349] In an embodiment of the present disclosure, the terminal may determine the RO resource to be preferentially adopted in the first RACH attempt of the initial random access process based on the indication information of the RO resource to be adopted in the first RACH attempt of the initial random access process configured by the network side device through the SIB, or the terminal may determine the RO resource to be preferentially adopted in the first RACH attempt of the subsequent random access process based on the indication information of the RO resource to be adopted in the first RACH attempt of the non-initial random access process configured by the network side device through the RRC, thereby realizing flexible adjustment of the RO resource.

[0350] In some embodiments, determining, based on the threshold, the RO resource to be used for the initial RACH attempt in the random access process includes:

[0351] Based on the comparison between the RSRP measurement result and the threshold, the RO resource to be used for the initial RACH attempt in the random access process is determined;

[0352] The RSRP measurement result is an RSRP measurement result corresponding to a reference signal index adopted in the initial RACH attempt; or, the RSRP measurement result is an RSRP measurement result of a downlink path loss reference.

[0353] In some embodiments, the terminal may determine the RO resource used in the initial RACH attempt during the random access process by comparing the reference signal received power RSRP measurement result corresponding to the reference signal index used in the initial RACH attempt with the threshold; or,

[0354] In some embodiments, the terminal may determine the RO resource to be used in the initial RACH attempt during the random access process by comparing the RSRP measurement result of the downlink path loss reference with the threshold.

[0355] In an embodiment of the present disclosure, the terminal compares the RSRP measurement result corresponding to the reference signal index used in the initial RACH attempt with the threshold, or the terminal compares the RSRP measurement result of the downlink path loss reference with the threshold, and determines the RO resource (or symbol type) to be preferentially used in the initial RACH attempt in the random access process (including initial random access and / or subsequent random access), thereby improving the random access success rate and / or random access performance.

[0356] In some embodiments, the terminal receives threshold indication information from the network side device, and determines the RO resource to be used in the initial RACH attempt during the random access process based on the threshold indication information from the network side device and the comparison result.

[0357] In some embodiments, the threshold indication information is used to indicate:

[0358] If the comparison result is that the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process;

[0359] or,

[0360] If the comparison result is that the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process.

[0361] Exemplarily, if the threshold indication information indicates that, when the comparison result is that the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource, the terminal determines whether the RSRP measurement result is greater than or equal to the threshold. If the RSRP measurement result is greater than or equal to the threshold, based on the indication of the threshold indication information, the terminal determines that the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than the threshold, based on the indication of the threshold indication information, the terminal determines that the RO resource used in the initial RACH attempt during the random access process is the second RO resource.

[0362] Exemplarily, if the threshold indication information indicates that, when the comparison result is that the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource, the terminal determines whether the RSRP measurement result is less than the threshold. If the RSRP measurement result is less than the threshold, based on the indication of the threshold indication information, the terminal determines that the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is greater than or equal to the threshold, based on the indication of the threshold indication information, the terminal determines that the RO resource used in the initial RACH attempt during the random access process is the second RO resource.

[0363] In some embodiments, the threshold indication information is used to indicate:

[0364] If the comparison result is that the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process;

[0365] or,

[0366] If the comparison result is that the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process.

[0367] Exemplarily, if the threshold indication information indicates that, when the comparison result is that the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource, the terminal determines whether the RSRP measurement result is greater than the threshold. If the RSRP measurement result is greater than the threshold, based on the indication of the threshold indication information, the terminal determines that the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than or equal to the threshold, based on the indication of the threshold indication information, the terminal determines that the RO resource used in the initial RACH attempt during the random access process is the second RO resource.

[0368] Exemplarily, if the threshold indication information indicates that, when the comparison result is that the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource, the terminal determines whether the RSRP measurement result is less than or equal to the threshold. If the RSRP measurement result is less than or equal to the threshold, based on the indication of the threshold indication information, the terminal determines that the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is greater than the threshold, based on the indication of the threshold indication information, the terminal determines that the RO resource used in the initial RACH attempt during the random access process is the second RO resource.

[0369] In the embodiment of the present disclosure, the terminal receives threshold indication information from the network side device, thereby being able to determine the RO resource to be used for the initial RACH attempt in the random access process based on the threshold indication information and the comparison result between the RSRP measurement result and the threshold, thereby improving the random access success rate and / or random access performance.

[0370] In some embodiments, when the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource.

[0371] In some embodiments, when the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource.

[0372] In the embodiment of the present disclosure, when the target RACH resource is the first RACH resource, more RO access opportunities can be increased. The terminal can flexibly select the RO resource to be used for the first RACH attempt during the random access process according to this situation, thereby improving the random access success rate and / or random access performance.

[0373] In some embodiments, when the target RACH resource includes the second RACH resource and the third RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource.

[0374] In some embodiments, when the target RACH resource includes the second RACH resource and the third RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource.

[0375] In the embodiment of the present disclosure, when the target RACH resource includes the second RACH resource and the third RACH resource, the long PRACH format can be configured through the second RACH resource to increase coverage performance. The terminal can flexibly select the RO resource for the initial RACH attempt during the random access process according to this situation, thereby improving the random access success rate and / or random access performance.

[0376] Example 1 (SBFD UE determines the RO resource selected for the initial RACH attempt based on certain rules)

[0377] The random access channel transmission resource selection method provided in this embodiment includes the following steps:

[0378] The SBFD UE determines the RO resource selected for the initial RACH attempt based on certain rules. For example, one way is that the protocol can predefine that when the SBFD UE performs random access under the premise of the first RO resource configured by the network side device, it gives priority to selecting the RO within the first RO resource set to send PRACH. Alternatively, another way is that the network side device instructs the SBFD UE to send PRACH to the RO within the first RO resource set. Specifically, if it is a UE performing initial access, for example, an idle state UE or an inactive state UE, the network side device broadcasts in the system information block (English: System Information Block, abbreviated: SIB) message an indication that the first RACH in the initial access random process uses the first RO resource to send PRACH; for a connected state UE performing subsequent random access, the network side device can indicate in the radio resource control (English: Radio Resource Control, abbreviated: RRC) signaling that the first RACH in the subsequent random access process uses the first RO resource to send PRACH. Alternatively, the third method is: the network side device is configured with a threshold for selecting the RO resource for the first RACH attempt (here refers to the RSRP threshold). When the reference signal received power (RSRP) measurement result corresponding to the reference signal index selected by the SBFD UE is higher / lower than the threshold for selecting the RO resource, the SBFD UE sends PRACH on the RO within the first RO resource set, otherwise the SBFD aware UE sends PRACH on the RO within the second RO resource set (for example, above the threshold, PRACH is sent on the RO within the first RO resource set; below the threshold, PRACH is sent on the RO within the second RO resource set. Or, below the threshold, PRACH is sent on the RO within the first RO resource set; above the threshold, PRACH is sent on the RO within the second RO resource set). Similarly, when the RSRP measurement result of the downlink path loss reference is higher / lower than the threshold of the symbol type (or RO resource selection), the SBFD UE sends PRACH to the RO within the first RO resource set (for example, if it is higher than the threshold, PRACH is sent on the RO within the first RO resource set; if it is lower than the threshold, PRACH is sent on the RO within the second RO resource set. Or, if it is lower than the threshold, PRACH is sent on the RO within the first RO resource set; if it is higher than the threshold, PRACH is sent on the RO within the second RO resource set).

[0379] After the initial RACH attempt fails, the SBFD UE initiates the next RACH attempt. During the new RACH attempt, the SBFD UE determines whether the current number of attempts has reached the maximum number of attempts. If not, the next RACH attempt can continue to send PRACH on the RO within the first RO resource set. If the SBFD UE reaches the maximum number of attempts, the SBFD UE needs to switch to sending PRACH on the RO within the second RO resource set in the next RACH attempt. The maximum number of attempts can be the maximum number of attempts to transmit PRACH on the RO within the first RO resource set configured by the network side device for the SBFD UE. In addition, the network side device will also configure the maximum number of attempts for a RACH process for the SBFD UE. If the maximum number of attempts to transmit PRACH on the RO within the first RO resource set configured by the network side device is less than the maximum number of attempts for a RACH process, it means that the SBFD UE can switch to sending PRACH on the RO within the second RO resource set in a RACH process.

[0380] Alternatively, only when the number of attempts reaches the maximum number of attempts for a RACH process, can the SBFD UE switch to sending PRACH on the RO in the second RO resource set. At this point, a RACH process has ended, and the SBFD UE selects the RO in the second RO resource set to send PRACH in the first RACH attempt of the next RACH process. In this case, the SBFD UE does not need to comply with the protocol pre-defined or network-side device configuration requirement that the first RACH attempt must select the first RO resource set, or does not need to comply with the requirement of determining the RO resource selection for the first RACH attempt based on RSRP threshold comparison. If all RACH attempts on the RO in the second RO resource set in this RACH process fail. The first RACH attempt of the next RACH process will still transmit PRACH from the RO in the first RO resource set pre-defined by the protocol or configured by the network side, or the RO resource for transmitting PRACH will be determined based on RSRP threshold comparison.

[0381] In some embodiments, determining, based on the target RACH resource, a random access opportunity (RO) resource to be used for an initial RACH attempt in a random access procedure includes:

[0382] determining a first RO resource and a second RO resource according to the target RACH resource;

[0383] An RO resource to be used for an initial RACH attempt in a random access procedure is determined from the first RO resource and the second RO resource.

[0384] In the embodiment of the present disclosure, the terminal divides the received target RACH resource into a first RO resource and a second RO resource, and selects the RO resource preferentially used in the initial RACH attempt from the first RO resource and the second RO resource for PRACH transmission, so that access can be performed more easily, thereby improving the success rate of random access.

[0385] Exemplarily, the SBFD UE receives the RACH resources (here, the target RACH resources) configured by the network side device, and the SBFD UE divides the RACH resources into a first RO resource and a second RO resource according to a predefined rule. The UE determines that the first RACH attempt uses the first RO resource for PRACH transmission. After certain conditions are met, subsequent RACH attempts switch to the second RO resource for PRACH transmission.

[0386] In some embodiments, the target RACH resource is a first RACH resource, and determining the first RO resource and the second RO resource according to the target RACH resource includes:

[0387] Determining a first RO resource and a second RO resource according to the first RACH resource;

[0388] The first RO resource is a valid RO set on a sub-band full-duplex downlink (SBFD) DL symbol in the first RACH resource, and the second RO resource is a valid RO set on a sub-band full-duplex flexible (SBFD) flexible symbol in the first RACH resource and / or a valid RO set on a non-SBFD symbol in the first RACH resource; or

[0389] The first RO resource is a valid RO set on SBFD symbols in the first RACH resource, and the second RO resource is a valid RO set on non-SBFD symbols in the first RACH resource.

[0390] In an embodiment of the present disclosure, a UE receives a first RACH resource sent by a network side, that is, the terminal receives information sent by a network side device indicating the first RACH resource configured for the terminal. The terminal determines, based on the first RACH resource, that the first RO resource is a valid RO set on SBFD DL symbols in the first RACH resource, and determines, based on the first RACH resource, that the second RO resource is a valid RO set on SBFD flexible symbols in the first RACH resource and / or a valid RO set on non-SBFD symbols in the first RACH resource. Alternatively, based on the first RACH resource, the terminal determines, based on the first RACH resource, that the first RO resource is a valid RO set on SBFD symbols in the first RACH resource, and determines, based on the first RACH resource, that the second RO resource is a valid RO set on non-SBFD symbols in the first RACH resource. Therefore, the first RO resource is a valid RO set on SBFD symbols in the first RACH resource or on SBFD DL symbols in SBFD symbols, and the second RO resource is a valid RO set on SBFD flexible symbols and / or non-SBFD symbols in SBFD symbols in the first RACH resource.

[0391] Exemplarily, the second embodiment (the first RO resource and the second RO resource are both determined by the same RACH resource configuration) specifically includes the following two cases:

[0392] One scenario is that SBFD UE and legacy UE (here refers to the UE that has been deployed now) share a set of RACH resources. This set of RACH resources is a resource configured by the network side device for UE that does not support any features. SBFD UE can only use the valid RO on SBFD DL symbols, and legacy UE can only use the valid RO on SBFD flexible and / or non-SBFD symbols. As shown in Figure 2, Figure 2 is a schematic diagram of the RACH resource configuration provided by an embodiment of the present disclosure (wherein, Slot n in Figure 2 represents time slot n), and Figure 2 specifically shows a schematic diagram of the first RACH resource being configured as legacy. The first RO resource is a set of valid ROs on SBFD DL symbols, and the second RO resource is a set of valid ROs on SBFD flexible and non-SBFD symbols. If time division duplexing (English: Time Division Duplexing, abbreviated as: TDD) is not configured with flexible symbols, it can be considered that SBFD UE can only use the valid RO on SBFD symbols, and legacy UE can only use the valid RO on non-SBFD symbols.

[0393] When the SBFD UE fails to transmit on the first RO resource for a certain number of times, it can switch to transmitting on the second RO resource.

[0394] This embodiment does not limit the combination of SBFD UEs with other UE features. For example, if an SBFD UE supports both SBFD and RedCap features, then a legacy UE can be a UE that only supports RedCap features. In this case, the RACH resources shared by these two types of UEs are configured by the network-side device for the RedCap feature. Alternatively, if an SBFD UE supports both SBFD and RedCap features, and a legacy UE does not support any features, then the RACH resources shared by these two types of UEs are configured by the network-side device for UEs that do not support any features. Furthermore, the valid RO determined by the shared RACH resources is divided into a first RO resource and a second RO resource according to the above rules.

[0395] In another scenario, the network device configures an additional set of RACH resources for the SBFD UE. The SBFD UE can use all valid ROs configured with this set of RACH resources. In this case, the first RO resource is the set of valid ROs on SBFD symbols, and the second RO resource is the set of valid ROs on non-SBFD symbols, as shown in Figure 3. Figure 3 is a second schematic diagram of RACH resource configuration provided in an embodiment of the present disclosure, and Figure 3 specifically shows a schematic diagram of the additional configuration of the first RACH resource. The resources configured by the network device for the legacy UE are not included in the first or second RO resources, and the SBFD UE cannot use the resources of the legacy UE.

[0396] When the SBFD UE fails to transmit on the first RO resource for a certain number of times, it can switch to transmitting on the second RO resource.

[0397] This embodiment does not restrict the combination of SBFD UEs with other UE features. For example, an SBFD UE supports both SBFD and RedCap features. The network-side device configures a set of resources for the SBFD + RedCap feature combination. The SBFD UE can use all valid ROs configured with this set of RACH resources. These valid ROs are further divided into primary RO resources and secondary RO resources according to the aforementioned rules.

[0398] In addition, a valid RO may span symbol types, that is, a valid RO may include both SBFD symbols and non-SBFD symbols. In this embodiment, such valid ROs belong to the first RO resource. That is, a valid RO containing only SBFD symbols and a valid RO containing both symbol types belong to the first RO resource (including SBFD DL symbols in the first case and all SBFD symbols in the second case).

[0399] In some embodiments, the target RACH resource includes a second RACH resource and a third RACH resource, and determining the first RO resource and the second RO resource according to the target RACH resource includes:

[0400] Determine the first RO resource according to the second RACH resource, where the first RO resource is a valid RO set on an SBFD symbol in the second RACH resource;

[0401] The second RO resource is determined according to the third RACH resource, where the second RO resource is a valid RO set on SBFD flexible symbols in the third RACH resource and / or a valid RO set on non-SBFD symbols in the third RACH resource.

[0402] In an embodiment of the present disclosure, a UE receives a second RACH resource and a third RACH resource sent by a network-side device, and the UE determines a first RO resource and a second RO resource based on the second RACH resource and the third RACH resource. That is, the terminal receives information sent by the network-side device indicating the second RACH resource and the third RACH resource configured for the terminal, and the terminal determines, based on the second RACH resource, that the first RO resource is a valid RO set on an SBFD symbol in the second RACH resource, and the terminal determines, based on the third RACH resource, that the second RO resource is a valid RO set on an SBFD flexible symbol in an SBFD symbol in the third RACH resource and / or a valid RO set on a non-SBFD symbol in the third RACH resource. Therefore, the first RO resource is a valid RO set on an SBFD symbol in the second RACH resource, and the second RO resource is a valid RO set on an SBFD flexible symbol and / or a non-SBFD symbol in an SBFD symbol in the third RACH resource.

[0403] Exemplarily, embodiment three (the first RO resource is determined by the second RACH resource configuration, and the second RO resource is determined by the third RACH resource configuration) specifically includes:

[0404] The network side device configures a third RACH resource for the legacy UE. The legacy UE can only recognize ROs on SBFD flexible symbols and / or non-SBFD symbols on this set of RACH resources. That is, the second RO resource is the valid RO set determined by the third RACH configuration.

[0405] In addition, the network-side device configures a second RACH resource for the SBFD UE. The ROs configured in this set of RACH resources may only include valid ROs on SBFD symbols. That is, in this embodiment, the second RACH resource configuration configures the first RO resource for the SBFD UE to include only a set of valid ROs on SBFD symbols, as shown in Figures 4A and 4B. Figure 4A is a schematic diagram of the RACH resource configuration provided in the embodiment of the present disclosure. Figure 4A specifically shows a schematic diagram of a second RACH resource configured with only SBFD symbols and all valid. Figure 4B is a schematic diagram of the RACH resource configuration provided in the embodiment of the present disclosure. Figure 4B specifically shows another schematic diagram of a second RACH resource configured with only SBFD symbols and all valid. At this time, the first RO resource is the set of valid ROs on the SBFD symbols in the second RACH resource.

[0406] Alternatively, when the RO of the first RACH resource configuration includes ROs on SBFD symbols and non-SBFD symbols, the RO on the non-SBFD symbols is an invalid RO, as shown in Figures 5A and 5B. Figure 5A is a schematic diagram of the RACH resource configuration provided in an embodiment of the present disclosure. Figure 5A specifically shows a schematic diagram of a second RACH resource configuration including an invalid RO for non-SBFD symbols. Figure 5B is a schematic diagram of the RACH resource configuration provided in an embodiment of the present disclosure. Figure 5B specifically shows another schematic diagram of a second RACH resource configuration including an invalid RO for non-SBFD symbols. The invalid behavior can be predefined by the protocol or indicated by the network-side device, and this embodiment does not impose any restrictions. At this time, the first RO resource is a set of valid ROs on SBFD symbols in the second RACH resource.

[0407] Alternatively, when the RO of the second RACH resource configuration includes ROs on SBFD symbols and / or non-SBFD symbols, the RO that time-domain conflicts with the third RACH resource is an invalid RO, as shown in Figures 6A, 6B, and 7. Figure 6A is a seventh schematic diagram of a RACH resource configuration provided in an embodiment of the present disclosure. Figure 6A specifically illustrates a schematic diagram of a second RACH resource configuration including SBFD symbols and non-SBFD symbols. Figure 6B is an eighth schematic diagram of a RACH resource configuration provided in an embodiment of the present disclosure. Figure 6B specifically illustrates another schematic diagram of a second RACH resource configuration including SBFD symbols and non-SBFD symbols. Figure 7 is a ninth schematic diagram of a RACH resource configuration provided in an embodiment of the present disclosure. Figure 7 specifically illustrates a schematic diagram of a second RACH resource configuration including only SBFD symbols. Invalid behavior can be predefined by the protocol or indicated by a network-side device, and this embodiment does not impose any restrictions. At this time, when the third RACH resource includes only non-SBFD symbols, the first RO resource is a set of valid ROs on the SBFD symbols in the second RACH resource. When the third RACH resource includes non-SBFD symbols and SBFD flexible symbols, the first RO resource does not include ROs on the SBFD flexible symbols of the second RACH resource, that is, the first RO resource is a valid RO set on some SBFD symbols in the second RACH resource.

[0408] Furthermore, a valid RO may span symbol types, meaning it may contain both SBFD and non-SBFD symbols. In this embodiment, such valid ROs belong to the first RO resource. In other words, a valid RO containing only SBFD symbols and a valid RO containing both symbol types belong to the first RO resource. If an SBFD UE fails to transmit on the first RO resource a certain number of times, it can switch to the second RO resource for PRACH transmission.

[0409] This embodiment does not limit the combination of SBFD UE and other UE features. For example, if the SBFD UE is a UE that supports both the SBFD and RedCap features, the legacy UE can be a UE that only supports the RedCap feature. In this case, the second RACH resource is configured by the network side for the UE that supports the SBFD+RedCap feature combination, and the third RACH resource is configured by the network side for the UE that only supports the RedCap feature. Alternatively, when the SBFD UE is a UE that supports both the SBFD and RedCap features, the legacy UE is a UE that does not support any features. In this case, the second RACH resource is configured by the network side for the UE that supports the SBFD+RedCap feature combination, and the third RACH resource is configured by the network side for the UE that does not support any features.

[0410] In this disclosure, a process for selecting transmission resources for SBFD UEs is designed, including a mechanism for prioritizing SBFD symbols for PRACH transmission and switching symbol types for PRACH transmission. Specifically, the SBFD UE uses RO resources on a first symbol type for PRACH transmission. Upon meeting certain conditions, it switches to RO resources on a second symbol type for PRACH transmission. This ensures that the SBFD UE prioritizes SBFD symbols for random access, reducing contention and improving the random access success rate. Furthermore, after a certain number of failures, the UE can switch to non-SBFD symbols with less interference for random access, further improving the random access success rate and performance.

[0411] It should be noted that the specific implementation process of the random access channel transmission resource selection method provided by the present disclosure with the terminal as the execution subject can refer to the embodiments shown in Figures 1 to 7, and the specific implementation process will not be repeated here.

[0412] 8 , which is a flow chart of a method for selecting a random access channel transmission resource according to another embodiment of the present disclosure, and applied to a network-side device, the method includes:

[0413] Step 801: Determine the target random access channel RACH resource configured for the terminal;

[0414] Step 802: Send configuration information of a target RACH resource to the terminal. The target RACH resource is used by the terminal to determine the RO resource to use for the initial RACH attempt during the random access process, and to switch the RO resource for subsequent RACH attempts after a predefined condition is met.

[0415] The configuration information includes a target RACH resource location, where the resource location refers to a time-frequency domain resource location.

[0416] In an embodiment of the present disclosure, a network-side device configures a target RACH resource for a terminal and sends configuration information of the target RACH resource to the terminal, so that the terminal determines the RACH resource based on the RACH resource location in the configuration information sent by the network-side device, and determines to perform PRACH transmission on the RO resource used in the initial RACH attempt. If a predefined condition is met (for example, the attempt fails M times, or the interference is relatively large), the terminal can provide the ability to switch the RO resource to perform RO resource switching, switching to a symbol with less interference or easier successful access for random access. Based on the RO resource switching capability of the terminal, it can be applicable to terminals that can identify different symbol types, thereby improving the random access success rate and random access performance.

[0417] In some embodiments, the method further comprises:

[0418] A maximum number of attempts configured for the terminal is determined.

[0419] In some embodiments, the maximum number of attempts is the maximum number of attempts of the terminal on a first RO resource, where the first RO resource is determined by the terminal based on the target RACH resource; or, the maximum number of attempts is the maximum number of RACH attempts in one RACH process.

[0420] Among them, the maximum number of attempts can be configured by the network side device, and the maximum number of attempts can be configured by the network side device in the above-mentioned configuration information, and the configuration information including the maximum number of attempts and the target RACH resource location is sent to the terminal. The configuration information here can be carried by a first message or a first signaling; or, the maximum number of attempts can be carried by a second message or a second signaling. In addition to sending the configuration information including the target RACH resource location to the terminal, the network side device can also send a second message or second signaling carrying the maximum number of attempts to the terminal.

[0421] It should be noted that the specific bearer and sending or receiving method of the configured target RACH resource location and the maximum number of attempts are not specifically limited here. The threshold and indication information configured by the following network-side device are similar to the maximum number of attempts and are not repeated here.

[0422] In an embodiment of the present disclosure, the maximum number of attempts configured by the network side device for the terminal is the maximum number of attempts on the first RO resource during a RACH process when the RACH attempt fails or the maximum number of RACH attempts in a RACH process, indicating that the terminal is switched to the RO resource used for subsequent RACH attempts after reaching the configured maximum number of attempts, or the terminal determines based on a received policy or local policy (for example, a predefined condition) that after reaching the configured maximum number of attempts, the RO resource is switched, thereby improving the random access success rate and the performance of random access.

[0423] In some embodiments, the target RACH resource is a first RACH resource, and sending the configuration information of the target RACH resource to the terminal includes:

[0424] Sending configuration information of the first RACH resource to the terminal; the first RACH resource is used by the terminal to determine the first RO resource and the second RO resource;

[0425] The first RO resource is a valid RO set on SBFD DL symbols in the first RACH resource, and the second RO resource is a valid RO set on SBFD flexible symbols in the first RACH resource and / or a valid RO set on non-SBFD symbols in the first RACH resource.

[0426] In an embodiment of the present disclosure, a network-side device configures a first RACH resource for a terminal and sends configuration information indicating the first RACH resource configured for the terminal to the terminal. Based on the configured first RACH resource, the terminal determines the first RO resource as a valid RO set on SBFD DL symbols in the first RACH resource, and determines the second RO resource as a valid RO set on SBFD flexible symbols in the first RACH resource and / or a valid RO set on non-SBFD symbols in the first RACH resource. Alternatively, based on the first RACH resource, the terminal determines the first RO resource as a valid RO set on SBFD symbols in the first RACH resource, and determines the second RO resource as a valid RO set on non-SBFD symbols in the first RACH resource. Therefore, the first RO resource is a valid RO set on SBFD symbols in the first RACH resource or on SBFD DL symbols in SBFD symbols, and the second RO resource is a valid RO set on SBFD flexible symbols and / or non-SBFD symbols in SBFD symbols in the first RACH resource.

[0427] In some embodiments, the target RACH resource includes a second RACH resource and a third RACH resource, and sending the configuration information of the target RACH resource to the terminal includes:

[0428] Sending configuration information of the second RACH resource and the third RACH resource to the terminal; the second RACH resource is used by the terminal to determine the first RO resource, and the third RACH resource is used by the terminal to determine the second RO resource;

[0429] The first RO resource is a valid RO set on SBFD symbols in the second RACH resource, and the second RO resource is a valid RO set on SBFD flexible symbols in the third RACH resource and / or a valid RO set on non-SBFD symbols in the third RACH resource.

[0430] In an embodiment of the present disclosure, a network-side device configures a second RACH resource and a third RACH resource for a terminal, and sends configuration information indicating the second RACH resource and the third RACH resource configured for the terminal to the terminal. Based on the configured second RACH resource, the terminal determines that the first RO resource is a valid RO set on the SBFD symbol in the second RACH resource. Based on the configured third RACH resource, the terminal determines that the second RO resource is a valid RO set on the SBFD flexible symbols in the SBFD symbols in the third RACH resource and / or a valid RO set on the non-SBFD symbols in the third RACH resource. Therefore, the first RO resource is a valid RO set on the SBFD symbol in the second RACH resource, and the second RO resource is a valid RO set on the SBFD flexible symbols and / or on the non-SBFD symbols in the SBFD symbols in the third RACH resource.

[0431] In some embodiments, the method further comprises:

[0432] Determining indication information, where the indication information is used to indicate an RO resource to be used for the initial RACH attempt in the random access procedure;

[0433] Sending instruction information to the terminal.

[0434] In some embodiments, the determining the indication information includes:

[0435] Determining the indication information through SIB configuration, where the indication information is used to indicate the RO resource to be adopted by the terminal in the initial RACH attempt during the initial random access process;

[0436] The indication information is determined through RRC configuration, where the indication information is used to indicate the RO resource to be adopted by the terminal in the initial RACH attempt during a non-initial random access process.

[0437] Specifically, the network side device configures the RO resources used in the first RACH attempt of the initial random access process through SIB, or the network side device configures the RO resources used in the first RACH attempt of the subsequent random access process through RRC.

[0438] In the embodiment of the present disclosure, the network side device configures the indication information of the RO resource adopted by the first RACH attempt of the initial random access process through the SIB, and instructs the terminal to determine the RO resource preferentially adopted by the first RACH attempt of the initial random access process, or the network side device configures the indication information of the RO resource adopted by the first RACH attempt of the non-initial random access process through the RRC, and instructs the terminal to determine the RO resource preferentially adopted by the first RACH attempt of the subsequent random access process, thereby realizing flexible adjustment of the RO resource.

[0439] In some embodiments, the method further comprises:

[0440] determining a threshold configured for the terminal, where the threshold is used by the terminal to determine an RO resource to be used for an initial RACH attempt in a random access procedure;

[0441] The threshold is sent to the terminal.

[0442] In an embodiment of the present disclosure, a network-side device configures a threshold for a terminal and sends indication information including the threshold to the terminal, instructing the terminal to compare the RSRP measurement result corresponding to the reference signal index used in the initial RACH attempt with the threshold, or the terminal to compare the RSRP measurement result of the downlink path loss reference with the threshold, to determine the RO resource to be preferentially used in the initial RACH attempt in the random access process (including initial random access and / or subsequent random access), thereby improving the random access success rate and / or random access performance.

[0443] In some embodiments, the method further comprises:

[0444] Send threshold indication information to the terminal.

[0445] In some embodiments, the threshold indication information is used to indicate:

[0446] If the comparison result is that the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process;

[0447] or,

[0448] If the comparison result is that the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process.

[0449] Exemplarily, if the threshold indication information indicates that, when the comparison result is that the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource, the terminal determines whether the RSRP measurement result is greater than or equal to the threshold. If the RSRP measurement result is greater than or equal to the threshold, based on the indication of the threshold indication information, the terminal determines that the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than the threshold, based on the indication of the threshold indication information, the terminal determines that the RO resource used in the initial RACH attempt during the random access process is the second RO resource.

[0450] Exemplarily, if the threshold indication information indicates that, when the comparison result is that the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource, the terminal determines whether the RSRP measurement result is less than the threshold. If the RSRP measurement result is less than the threshold, based on the indication of the threshold indication information, the terminal determines that the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is greater than or equal to the threshold, based on the indication of the threshold indication information, the terminal determines that the RO resource used in the initial RACH attempt during the random access process is the second RO resource.

[0451] In some embodiments, the threshold indication information is used to indicate:

[0452] If the comparison result is that the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process;

[0453] or,

[0454] If the comparison result is that the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process.

[0455] Exemplarily, if the threshold indication information indicates that, when the comparison result is that the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource, the terminal determines whether the RSRP measurement result is greater than the threshold. If the RSRP measurement result is greater than the threshold, based on the indication of the threshold indication information, the terminal determines that the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than or equal to the threshold, based on the indication of the threshold indication information, the terminal determines that the RO resource used in the initial RACH attempt during the random access process is the second RO resource.

[0456] Exemplarily, if the threshold indication information indicates that, when the comparison result is that the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource, the terminal determines whether the RSRP measurement result is less than or equal to the threshold. If the RSRP measurement result is less than or equal to the threshold, based on the indication of the threshold indication information, the terminal determines that the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is greater than the threshold, based on the indication of the threshold indication information, the terminal determines that the RO resource used in the initial RACH attempt during the random access process is the second RO resource.

[0457] In the disclosed embodiment, the network side device sends threshold indication information to the terminal, so that the terminal can determine the RO resource to be used for the initial RACH attempt in the random access process according to the threshold indication information and the comparison result of the RSRP measurement result and the threshold, thereby improving the random access success rate and / or random access performance.

[0458] In some embodiments, when the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource.

[0459] In some embodiments, when the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource.

[0460] In the embodiment of the present disclosure, when the target RACH resource is the first RACH resource, more RO access opportunities can be increased. The terminal can flexibly select the RO resource to be used for the first RACH attempt during the random access process according to this situation, thereby improving the random access success rate and / or random access performance.

[0461] In some embodiments, when the target RACH resource includes the second RACH resource and the third RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource.

[0462] In some embodiments, when the target RACH resource includes the second RACH resource and the third RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource.

[0463] In the embodiment of the present disclosure, when the target RACH resource includes the second RACH resource and the third RACH resource, the long PRACH format can be configured through the second RACH resource to increase coverage performance. The terminal can flexibly select the RO resource for the initial RACH attempt during the random access process according to this situation, thereby improving the random access success rate and / or random access performance.

[0464] In the embodiment of the present disclosure, when the target RACH resource includes the second RACH resource and the third RACH resource, the long PRACH format can be configured through the second RACH resource to increase coverage performance. The terminal can flexibly select the RO resource for the initial RACH attempt during the random access process according to this situation, thereby improving the random access success rate and / or random access performance.

[0465] In some embodiments, the method further comprises:

[0466] The preamble sent by the terminal is received on the configured RO resource.

[0467] In the disclosed embodiment, the network-side device configures a first RACH resource for the SBFD UE, or configures a second RACH resource and a third RACH resource for the SBFD UE. The network-side device receives the preamble (herein, the preamble or preamble code) sent by the UE on the configured resource. The network-side device may also send signaling to indicate the RO resource type or RO resource that the UE attempts to select in the first RACH. This ensures that the SBFD UE prioritizes SBFD symbols for random access, reduces contention conflicts, and improves the success rate of random access. In addition, after a certain number of failures, it can switch to a non-SBFD symbol with less interference for random access, further improving the success rate of random access and random access performance.

[0468] It should be noted that the random access channel transmission resource selection method provided by the present disclosure with the network side device as the execution body can refer to the embodiments shown in Figures 2 to 8 for its specific implementation process, and the specific implementation process will not be repeated here.

[0469] Figure 9 is a structural schematic diagram 1 of the random access channel transmission resource selection device provided in an embodiment of the present disclosure. As shown in Figure 9, the random access channel transmission resource selection device provided in this embodiment is applied to a terminal, and the random access channel transmission resource selection device provided in this embodiment includes: a transceiver 900, which is used to receive and send data under the control of a processor 910.

[0470] In FIG9 , the bus architecture may include any number of interconnected buses and bridges, specifically various circuits connected together by one or more processors represented by processor 910 and memory represented by memory 920. The bus architecture may also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 900 may be a plurality of components, including a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium, such as a wireless channel, a wired channel, an optical cable, and the like. For different user devices, the user interface 930 may also be an interface capable of connecting external or internal devices as required, and the connected devices include but are not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.

[0471] The processor 910 is responsible for managing the bus architecture and general processing, and the memory 920 can store data used by the processor 910 when performing operations.

[0472] In some embodiments, the processor 910 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or a complex programmable logic device (CPLD). The processor may also adopt a multi-core architecture.

[0473] The processor 910 is configured to execute any of the methods provided by the embodiments of the present disclosure according to the obtained executable instructions by calling the program stored in the memory 920. The processor 910 and the memory 920 may also be physically separated.

[0474] In this embodiment, the memory 920 is used to store a computer program; the transceiver 900 is used to send and receive data under the control of the processor; and the processor 910 is used to read the computer program in the memory and perform the following operations:

[0475] Determine the target random access channel (RACH) resource configured by the network side device;

[0476] Determine the random access opportunity RO resource to be used for the initial RACH attempt in the random access process based on the target RACH resource, and perform physical random access channel PRACH transmission on the RO resource used for the initial RACH attempt;

[0477] After the predefined conditions are met, subsequent RACH attempts are made by switching RO resources.

[0478] In the embodiment of the present disclosure, the terminal determines to perform PRACH transmission on the RO resource used in the initial RACH attempt by receiving configuration information of the RACH resource configured by the network-side device. If a predefined condition is met (for example, the attempt fails M times, or the interference is relatively large, etc.), the terminal can provide the ability to switch the RO resource to perform RO resource switching, switching to a symbol with less interference or easier to successfully access for random access. Based on the RO resource switching capability of the terminal, it can be applicable to terminals that can identify different symbol types, thereby improving the random access success rate and random access performance.

[0479] In some embodiments, the predefined condition is that the number of failed RACH attempts in one RACH process reaches a maximum number of attempts.

[0480] In some embodiments, the maximum number of attempts in the predefined condition is the maximum number of attempts of the terminal on the first RO resource configured by the network side device, and the first RO resource is determined based on the target RACH resource; or

[0481] The maximum number of attempts in the predefined condition is the maximum number of RACH attempts of one RACH process configured by the network side device.

[0482] In the embodiment of the present disclosure, when a RACH attempt fails in one RACH process and reaches the maximum number of attempts on the first RO resource or the maximum number of RACH attempts for one RACH process configured by the network side device, the terminal switches the RO resource used for subsequent RACH attempts, thereby improving the random access success rate and random access performance.

[0483] In some embodiments, the processor 910 is configured to determine, based on the target RACH resource, a random access opportunity (RO) resource to be used for an initial RACH attempt in a random access process, specifically including:

[0484] determining a first RO resource and a second RO resource according to the target RACH resource;

[0485] An RO resource to be used for an initial RACH attempt in a random access procedure is determined from the first RO resource and the second RO resource.

[0486] In the embodiment of the present disclosure, the terminal divides the received target RACH resource into a first RO resource and a second RO resource, and selects the RO resource preferentially used in the initial RACH attempt from the first RO resource and the second RO resource for PRACH transmission, so that access can be performed more easily, thereby improving the success rate of random access.

[0487] In some embodiments, the processor 910 is configured to perform a subsequent RACH attempt by switching RO resources, specifically including:

[0488] If the RO resource used in the initial RACH attempt is the first RO resource, after switching the RO resource, the subsequent RACH attempts use the second RO resource;

[0489] If the RO resource used in the initial RACH attempt is the second RO resource, after the RO resource is switched, the subsequent RACH attempts use the first RO resource.

[0490] In the embodiment of the present disclosure, if the terminal fails in a RACH attempt and reaches the maximum number of attempts during a RACH process, in order to ensure successful access and / or improve random access performance, the RO resource used for subsequent RACH attempts will be switched. For example, the first RACH attempt uses the first RO resource, the RO resource after switching is the second RO resource, and the second RO resource is used in subsequent RACH attempts, or the first RACH attempt uses the second RO resource, the RO resource after switching is the first RO resource, and the first RO resource is used in subsequent RACH attempts.

[0491] In some embodiments, the target RACH resource is a first RACH resource, and the processor 910 is configured to determine the first RO resource and the second RO resource according to the target RACH resource, specifically including:

[0492] Determining a first RO resource and a second RO resource according to the first RACH resource;

[0493] The first RO resource is a valid RO set on a sub-band full-duplex downlink (SBFD) DL symbol in the first RACH resource, and the second RO resource is a valid RO set on a sub-band full-duplex flexible (SBFD) flexible symbol in the first RACH resource and / or a valid RO set on a non-SBFD symbol in the first RACH resource; or

[0494] The first RO resource is a valid RO set on SBFD symbols in the first RACH resource, and the second RO resource is a valid RO set on non-SBFD symbols in the first RACH resource.

[0495] In an embodiment of the present disclosure, a terminal receives information sent by a network-side device indicating a first RACH resource configured for the terminal. Based on the first RACH resource, the terminal determines that the first RO resource is a valid RO set on SBFD DL symbols in the first RACH resource, and determines that the second RO resource is a valid RO set on SBFD flexible symbols in the first RACH resource and / or a valid RO set on non-SBFD symbols in the first RACH resource. Alternatively, based on the first RACH resource, the terminal determines that the first RO resource is a valid RO set on SBFD symbols in the first RACH resource, and determines that the second RO resource is a valid RO set on non-SBFD symbols in the first RACH resource. Therefore, the first RO resource is a valid RO set on SBFD symbols in the first RACH resource or on SBFD DL symbols in SBFD symbols, and the second RO resource is a valid RO set on SBFD flexible symbols and / or non-SBFD symbols in SBFD symbols in the first RACH resource.

[0496] In some embodiments, the target RACH resource includes a second RACH resource and a third RACH resource, and the processor 910 is configured to determine the RO resource and the second RO resource according to the target RACH resource, specifically including:

[0497] Determine the first RO resource according to the second RACH resource, where the first RO resource is a valid RO set on an SBFD symbol in the second RACH resource;

[0498] The second RO resource is determined according to the third RACH resource, where the second RO resource is a valid RO set on SBFD flexible symbols in the third RACH resource and / or a valid RO set on non-SBFD symbols in the third RACH resource.

[0499] In an embodiment of the present disclosure, a terminal receives information sent by a network-side device indicating a second RACH resource and a third RACH resource configured for the terminal. Based on the second RACH resource, the terminal determines that the first RO resource is a valid RO set on SBFD symbols in the second RACH resource. Based on the third RACH resource, the terminal determines that the second RO resource is a valid RO set on SBFD flexible symbols among the SBFD symbols in the third RACH resource and / or a valid RO set on non-SBFD symbols in the third RACH resource. Therefore, the first RO resource is a valid RO set on SBFD symbols in the second RACH resource, and the second RO resource is a valid RO set on SBFD flexible symbols and / or non-SBFD symbols among the SBFD symbols in the third RACH resource.

[0500] In some embodiments, the processor 910 is configured to determine, from the first RO resource and the second RO resource, an RO resource to be used for an initial RACH attempt in a random access process, specifically including any of the following:

[0501] Determine the RO resource to be used for the initial RACH attempt during random access according to the protocol predefined rules;

[0502] Determining, according to the instruction information of the network side device, the RO resource to be used for the initial RACH attempt in the random access process;

[0503] According to the threshold, the RO resource to be used for the initial RACH attempt in the random access process is determined.

[0504] In the disclosed embodiments, a terminal can determine the RO resource to be used for the initial RACH attempt during a random access process in at least three ways: Method 1: When the network side configures the first RO resource, the first RO resource is preferentially used for the first RACH attempt (here, the initial time, i.e., the number of preamble transmissions N is equal to 1); Method 2: The network side device indicates the RO resource to be used for the first RACH attempt; Method 3: The UE determines the RO resource to be used for the first attempt based on a threshold. This achieves diversified RO resource selection methods for the initial RACH attempt.

[0505] In some embodiments, the protocol predefined rule includes: when the network side device configures the first RO resource, the first RO resource is preferentially used in the initial RACH attempt during the random access process.

[0506] In the disclosed embodiment, based on the protocol predefined rules, it can be ensured that the SBFD UE preferentially selects SBFD symbols for random access, thereby reducing contention conflicts and improving the success rate of random access.

[0507] In some embodiments, the indication information includes an RO resource used in an initial RACH attempt during an initial random access process and an RO resource used in an initial RACH attempt during a non-initial random access process;

[0508] The RO resources used in the initial RACH attempt during the initial random access process are configured by the network side device through the system information block SIB, and the RO resources used in the initial RACH attempt during the non-initial random access process are configured by the network side device through the radio resource control RRC.

[0509] In an embodiment of the present disclosure, the terminal may determine the RO resource to be preferentially adopted in the first RACH attempt of the initial random access process based on the indication information of the RO resource to be adopted in the first RACH attempt of the initial random access process configured by the network side device through the SIB, or the terminal may determine the RO resource to be preferentially adopted in the first RACH attempt of the subsequent random access process based on the indication information of the RO resource to be adopted in the first RACH attempt of the non-initial random access process configured by the network side device through the RRC, thereby realizing flexible adjustment of the RO resource.

[0510] In some embodiments, the processor 910 is configured to determine, based on a threshold, an RO resource to be used for an initial RACH attempt in a random access process, specifically including:

[0511] determining, based on a comparison result of the RSRP measurement result and the threshold, an RO resource to be used for an initial RACH attempt in a random access process;

[0512] The RSRP measurement result is an RSRP measurement result corresponding to a reference signal index adopted in an initial RACH attempt; or, the RSRP measurement result is an RSRP measurement result of a downlink path loss reference.

[0513] In an embodiment of the present disclosure, the terminal compares the RSRP measurement result corresponding to the reference signal index used in the initial RACH attempt with the threshold, or the terminal compares the RSRP measurement result of the downlink path loss reference with the threshold, and determines the RO resource to be preferentially used in the initial RACH attempt in the random access process (including initial random access and / or subsequent random access), thereby improving the random access success rate and / or random access performance.

[0514] In some embodiments, the processor 910 is configured to determine, based on a comparison result of a reference signal received power (RSRP) measurement result and the threshold, an RO resource to be used for an initial RACH attempt in a random access process, specifically including:

[0515] determining, according to the threshold indication information of the network-side device and the comparison result, an RO resource to be used for an initial RACH attempt in a random access process;

[0516] The threshold indication information is used to indicate: when the comparison result is that the RSRP measurement result is greater than or equal to the threshold, the RO resource to be used for the initial RACH attempt during the random access process; or, when the comparison result is that the RSRP measurement result is less than the threshold, the RO resource to be used for the initial RACH attempt during the random access process;

[0517] or,

[0518] The threshold indication information is used to indicate: when the comparison result shows that the RSRP measurement result is greater than the threshold, the RO resource to be used in the initial RACH attempt during the random access process; or when the comparison result shows that the RSRP measurement result is less than or equal to the threshold, the RO resource to be used in the initial RACH attempt during the random access process.

[0519] In the embodiment of the present disclosure, the terminal receives threshold indication information from the network side device, thereby being able to determine the RO resource to be used for the initial RACH attempt in the random access process based on the threshold indication information and the comparison result between the RSRP measurement result and the threshold, thereby improving the random access success rate and / or random access performance.

[0520] In some embodiments, the RO resource used in the initial RACH attempt during the random access process satisfies any of the following conditions:

[0521] In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource;

[0522] In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource;

[0523] In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource;

[0524] In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource.

[0525] In the embodiment of the present disclosure, when the target RACH resource is the first RACH resource, more RO access opportunities can be increased. When the target RACH resource includes the second RACH resource and the third RACH resource, the long PRACH format can be configured through the second RACH resource to increase coverage performance. The terminal can flexibly select the RO resource for the initial RACH attempt during the random access process for these two different situations, thereby improving the random access success rate and / or random access performance.

[0526] It should be noted here that the random access channel transmission resource selection device provided by the present disclosure can implement all the method steps implemented by the method embodiment described in the first aspect above, and can achieve the same technical effect. The parts and beneficial effects that are the same as those in the method embodiment in this embodiment will not be described in detail here.

[0527] FIG10 is a second structural diagram of a random access channel transmission resource selection apparatus provided in an embodiment of the present disclosure. The random access channel transmission resource selection apparatus provided in this embodiment is applied to a terminal. The random access channel transmission resource selection apparatus 1000 provided in this embodiment includes:

[0528] The first determining unit 1001 is configured to determine a target random access channel RACH resource configured by a network side device;

[0529] The second determining unit 1002 is configured to determine, based on the target RACH resource, a random access opportunity (RO) resource to be used in an initial RACH attempt during a random access process, and perform a physical random access channel (PRACH) transmission on the RO resource used in the initial RACH attempt;

[0530] The switching unit 1003 is configured to perform a subsequent RACH attempt by switching RO resources after a predefined condition is met.

[0531] In the embodiment of the present disclosure, the terminal receives information about RACH resources configured by the network-side device through the first determination unit 1001, the second determination unit 1002, and the switching unit 1003, and determines to perform PRACH transmission on the RO resources used in the initial RACH attempt. If a predefined condition is met (for example, the attempt fails M times, or the interference is relatively large, etc.), the terminal can provide the ability to switch RO resources to perform RO resource switching, and switch to a symbol with less interference or easier successful access for random access. Based on the RO resource switching capability of the terminal, it can be applicable to terminals that can identify different symbol types, thereby improving the random access success rate and random access performance.

[0532] In some embodiments, the predefined condition is that the number of failed RACH attempts in one RACH process reaches a maximum number of attempts.

[0533] In some embodiments, the maximum number of attempts in the predefined condition is the maximum number of attempts of the terminal on the first RO resource configured by the network side device, and the first RO resource is determined based on the target RACH resource; or

[0534] The maximum number of attempts in the predefined condition is the maximum number of RACH attempts of one RACH process configured by the network side device.

[0535] In the embodiment of the present disclosure, when a RACH attempt fails in one RACH process and reaches the maximum number of attempts on the first RO resource or the maximum number of RACH attempts for one RACH process configured by the network side device, the terminal switches the RO resource used for subsequent RACH attempts, thereby improving the random access success rate and random access performance.

[0536] In some embodiments, the second confirmation unit 1002 is specifically used to:

[0537] determining a first RO resource and a second RO resource according to the target RACH resource;

[0538] An RO resource to be used for an initial RACH attempt in a random access procedure is determined from the first RO resource and the second RO resource.

[0539] In the embodiment of the present disclosure, the terminal divides the received target RACH resource into a first RO resource and a second RO resource, and selects the RO resource preferentially used in the initial RACH attempt from the first RO resource and the second RO resource for PRACH transmission, so that access can be performed more easily, thereby improving the success rate of random access.

[0540] In some embodiments, the switching unit 1003 is specifically configured to:

[0541] When the RO resource used in the initial RACH attempt is the first RO resource, after the RO resource is switched, the subsequent RACH attempt uses the second RO resource;

[0542] When the RO resource used in the initial RACH attempt is the second RO resource, after the RO resource is switched, the subsequent RACH attempts use the first RO resource.

[0543] In the embodiment of the present disclosure, if the terminal fails in a RACH attempt and reaches the maximum number of attempts during a RACH process, in order to ensure successful access and / or improve random access performance, the RO resource used for subsequent RACH attempts will be switched. For example, the first RACH attempt uses the first RO resource, the RO resource after switching is the second RO resource, and the second RO resource is used in subsequent RACH attempts, or the first RACH attempt uses the second RO resource, the RO resource after switching is the first RO resource, and the first RO resource is used in subsequent RACH attempts.

[0544] In some embodiments, the target RACH resource is a first RACH resource, and the second determining unit 1002 is specifically configured to:

[0545] Determining a first RO resource and a second RO resource according to the first RACH resource;

[0546] The first RO resource is a valid RO set on a sub-band full-duplex downlink (SBFD) DL symbol in the first RACH resource, and the second RO resource is a valid RO set on a sub-band full-duplex flexible (SBFD) flexible symbol in the first RACH resource and / or a valid RO set on a non-SBFD symbol in the first RACH resource; or

[0547] The first RO resource is a valid RO set on SBFD symbols in the first RACH resource, and the second RO resource is a valid RO set on non-SBFD symbols in the first RACH resource.

[0548] In an embodiment of the present disclosure, a terminal receives information sent by a network-side device indicating a first RACH resource configured for the terminal. Based on the first RACH resource, the terminal determines that the first RO resource is a valid RO set on SBFD DL symbols in the first RACH resource, and determines that the second RO resource is a valid RO set on SBFD flexible symbols in the first RACH resource and / or a valid RO set on non-SBFD symbols in the first RACH resource. Alternatively, based on the first RACH resource, the terminal determines that the first RO resource is a valid RO set on SBFD symbols in the first RACH resource, and determines that the second RO resource is a valid RO set on non-SBFD symbols in the first RACH resource. Therefore, the first RO resource is a valid RO set on SBFD symbols in the first RACH resource or on SBFD DL symbols in SBFD symbols, and the second RO resource is a valid RO set on SBFD flexible symbols and / or non-SBFD symbols in SBFD symbols in the first RACH resource.

[0549] In some embodiments, the target RACH resource includes a second RACH resource and a third RACH resource, and the second determining unit 1002 is specifically configured to:

[0550] Determine the first RO resource according to the second RACH resource, where the first RO resource is a valid RO set on an SBFD symbol in the second RACH resource;

[0551] The second RO resource is determined according to the third RACH resource, where the second RO resource is a valid RO set on SBFD flexible symbols in the third RACH resource and / or a valid RO set on non-SBFD symbols in the third RACH resource.

[0552] In an embodiment of the present disclosure, a terminal receives information sent by a network-side device indicating a second RACH resource and a third RACH resource configured for the terminal. Based on the second RACH resource, the terminal determines that the first RO resource is a valid RO set on SBFD symbols in the second RACH resource. Based on the third RACH resource, the terminal determines that the second RO resource is a valid RO set on SBFD flexible symbols among the SBFD symbols in the third RACH resource and / or a valid RO set on non-SBFD symbols in the third RACH resource. Therefore, the first RO resource is a valid RO set on SBFD symbols in the second RACH resource, and the second RO resource is a valid RO set on SBFD flexible symbols and / or non-SBFD symbols among the SBFD symbols in the third RACH resource.

[0553] In some embodiments, the second determining unit 1002 is specifically configured to perform any of the following:

[0554] Determine the RO resource to be used for the initial RACH attempt during random access according to the protocol predefined rules;

[0555] Determining, according to the instruction information of the network side device, the RO resource to be used for the initial RACH attempt in the random access process;

[0556] According to the threshold, the RO resource to be used for the initial RACH attempt in the random access process is determined.

[0557] In the disclosed embodiments, a terminal can determine the RO resource to be used for the initial RACH attempt during a random access process in at least three ways: Method 1: When the network side configures the first RO resource, the first RO resource is preferentially used for the first RACH attempt (here, the initial time, i.e., the number of preamble transmissions N is equal to 1); Method 2: The network side device indicates the RO resource to be used for the first RACH attempt; Method 3: The UE determines the RO resource to be used for the first attempt based on a threshold. This achieves diversified RO resource selection methods for the initial RACH attempt.

[0558] In some embodiments, the protocol predefined rule includes: when the network side device configures the first RO resource, the first RO resource is preferentially used in the initial RACH attempt during the random access process.

[0559] In the disclosed embodiment, based on the protocol predefined rules, it can be ensured that the SBFD UE preferentially selects SBFD symbols for random access, thereby reducing contention conflicts and improving the success rate of random access.

[0560] In some embodiments, the indication information includes an RO resource used in an initial RACH attempt during an initial random access process and an RO resource used in an initial RACH attempt during a non-initial random access process;

[0561] The RO resources used in the initial RACH attempt during the initial random access process are configured by the network side device through the system information block SIB, and the RO resources used in the initial RACH attempt during the non-initial random access process are configured by the network side device through the radio resource control RRC.

[0562] In an embodiment of the present disclosure, the terminal may determine the RO resource to be preferentially adopted in the first RACH attempt of the initial random access process based on the indication information of the RO resource to be adopted in the first RACH attempt of the initial random access process configured by the network side device through the SIB, or the terminal may determine the RO resource to be preferentially adopted in the first RACH attempt of the subsequent random access process based on the indication information of the RO resource to be adopted in the first RACH attempt of the non-initial random access process configured by the network side device through the RRC, thereby realizing flexible adjustment of the RO resource.

[0563] In some embodiments, the second determining unit 1002 is specifically configured to:

[0564] determining, based on a comparison result of the RSRP measurement result and the threshold, an RO resource to be used for an initial RACH attempt in a random access process;

[0565] The RSRP measurement result is an RSRP measurement result corresponding to a reference signal index adopted in an initial RACH attempt; or, the RSRP measurement result is an RSRP measurement result of a downlink path loss reference.

[0566] In an embodiment of the present disclosure, the terminal compares the RSRP measurement result corresponding to the reference signal index used in the initial RACH attempt with the threshold, or the terminal compares the RSRP measurement result of the downlink path loss reference with the threshold, and determines the RO resource to be preferentially used in the initial RACH attempt in the random access process (including initial random access and / or subsequent random access), thereby improving the random access success rate and / or random access performance.

[0567] In some embodiments, the second determining unit 1002 is specifically configured to:

[0568] determining, according to the threshold indication information of the network-side device and the comparison result, an RO resource to be used for an initial RACH attempt in a random access process;

[0569] The threshold indication information is used to indicate: when the comparison result is that the RSRP measurement result is greater than or equal to the threshold, the RO resource to be used for the initial RACH attempt during the random access process; or, when the comparison result is that the RSRP measurement result is less than the threshold, the RO resource to be used for the initial RACH attempt during the random access process;

[0570] or,

[0571] The threshold indication information is used to indicate: when the comparison result shows that the RSRP measurement result is greater than the threshold, the RO resource to be used in the initial RACH attempt during the random access process; or when the comparison result shows that the RSRP measurement result is less than or equal to the threshold, the RO resource to be used in the initial RACH attempt during the random access process.

[0572] In the embodiment of the present disclosure, the terminal receives threshold indication information from the network side device, thereby being able to determine the RO resource to be used for the initial RACH attempt in the random access process based on the threshold indication information and the comparison result between the RSRP measurement result and the threshold, thereby improving the random access success rate and / or random access performance.

[0573] In some embodiments, the RO resource used in the initial RACH attempt during the random access process satisfies any of the following conditions:

[0574] In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource;

[0575] In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource;

[0576] In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource;

[0577] In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource.

[0578] In the embodiment of the present disclosure, when the target RACH resource is the first RACH resource, more RO access opportunities can be increased. When the target RACH resource includes the second RACH resource and the third RACH resource, the long PRACH format can be configured through the second RACH resource to increase coverage performance. The terminal can flexibly select the RO resource for the initial RACH attempt during the random access process for these two different situations, thereby improving the random access success rate and / or random access performance.

[0579] It should be noted here that the random access channel transmission resource selection device provided by the present disclosure can implement all the method steps implemented by the method embodiment described in the first aspect above, and can achieve the same technical effect. The parts and beneficial effects that are the same as those in the method embodiment in this embodiment will not be described in detail here.

[0580] Figure 11 is a third structural diagram of the random access channel transmission resource selection device provided in an embodiment of the present disclosure. As shown in Figure 11, the random access channel transmission resource selection device provided in this embodiment is applied to a network side device. The random access channel transmission resource selection device provided in this embodiment includes: a transceiver 1100, which is used to receive and send data under the control of a processor 1110.

[0581] In FIG11 , the bus architecture may include any number of interconnected buses and bridges, specifically various circuits linked together by one or more processors represented by processor 1110 and memory represented by memory 1120. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 1100 may be a plurality of components, namely, a transmitter and a receiver, providing a unit for communicating with various other devices over a transmission medium, such as a wireless channel, a wired channel, an optical cable, and the like. The processor 1110 is responsible for managing the bus architecture and general processing, and the memory 1120 may store data used by the processor 1110 when performing operations.

[0582] The processor 1110 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or a complex programmable logic device (CPLD). The processor may also adopt a multi-core architecture.

[0583] In this embodiment, the memory 1120 is used to store a computer program; the transceiver 1100 is used to send and receive data under the control of the processor; and the processor 1110 is used to read the computer program in the memory and perform the following operations:

[0584] Determine a target random access channel RACH resource configured for the terminal;

[0585] The configuration information of the target RACH resource is sent to the terminal, where the target RACH resource is used by the terminal to determine the RO resource to be used for the initial RACH attempt in the random access process, and to perform subsequent RACH attempts by switching the RO resource after a predefined condition is met.

[0586] In an embodiment of the present disclosure, a network-side device configures a target RACH resource for a terminal and sends configuration information of the target RACH resource to the terminal, so that the terminal determines the RACH resource based on the RACH resource location in the configuration information sent by the network-side device, and determines to perform PRACH transmission on the RO resource used in the initial RACH attempt. If a predefined condition is met (for example, the attempt fails M times, or the interference is relatively large), the terminal can provide the ability to switch the RO resource to perform RO resource switching, switching to a symbol with less interference or easier successful access for random access. Based on the RO resource switching capability of the terminal, it can be applicable to terminals that can identify different symbol types, thereby improving the random access success rate and random access performance.

[0587] In some embodiments, the processor 1110 is further configured to perform the following operations:

[0588] A maximum number of attempts configured for the terminal is determined.

[0589] In some embodiments, the maximum number of attempts is the maximum number of attempts of the terminal on a first RO resource, where the first RO resource is determined by the terminal based on the target RACH resource; or, the maximum number of attempts is the maximum number of RACH attempts in one RACH process.

[0590] In an embodiment of the present disclosure, the maximum number of attempts configured by the network side device for the terminal is the maximum number of attempts on the first RO resource during a RACH process when the RACH attempt fails or the maximum number of RACH attempts in a RACH process, indicating that the terminal is switched to the RO resource used for subsequent RACH attempts after reaching the configured maximum number of attempts, or the terminal determines based on a received policy or local policy (for example, a predefined condition) that after reaching the configured maximum number of attempts, the RO resource is switched, thereby improving the random access success rate and the performance of random access.

[0591] In some embodiments, the target RACH resource is a first RACH resource, and the processor 1110 is configured to send configuration information of the target RACH resource to the terminal, specifically including:

[0592] Sending configuration information of the first RACH resource to the terminal; the first RACH resource is used by the terminal to determine the first RO resource and the second RO resource;

[0593] The first RO resource is a valid RO set on SBFD DL symbols in the first RACH resource, and the second RO resource is a valid RO set on SBFD flexible symbols in the first RACH resource and / or a valid RO set on non-SBFD symbols in the first RACH resource.

[0594] In an embodiment of the present disclosure, a network-side device configures a first RACH resource for a terminal and sends configuration information indicating the first RACH resource configured for the terminal to the terminal. Based on the configured first RACH resource, the terminal determines the first RO resource as a valid RO set on SBFD DL symbols in the first RACH resource, and determines the second RO resource as a valid RO set on SBFD flexible symbols in the first RACH resource and / or a valid RO set on non-SBFD symbols in the first RACH resource. Alternatively, based on the first RACH resource, the terminal determines the first RO resource as a valid RO set on SBFD symbols in the first RACH resource, and determines the second RO resource as a valid RO set on non-SBFD symbols in the first RACH resource. Therefore, the first RO resource is a valid RO set on SBFD symbols in the first RACH resource or on SBFD DL symbols in SBFD symbols, and the second RO resource is a valid RO set on SBFD flexible symbols and / or non-SBFD symbols in SBFD symbols in the first RACH resource.

[0595] In some embodiments, the target RACH resource includes a second RACH resource and a third RACH resource, and the processor 1110 is configured to send configuration information of the target RACH resource to the terminal, specifically including:

[0596] Sending configuration information of the second RACH resource and the third RACH resource to the terminal; the second RACH resource is used by the terminal to determine the first RO resource, and the third RACH resource is used by the terminal to determine the second RO resource;

[0597] The first RO resource is a valid RO set on SBFD symbols in the second RACH resource, and the second RO resource is a valid RO set on SBFD flexible symbols in the third RACH resource and / or a valid RO set on non-SBFD symbols in the third RACH resource.

[0598] In an embodiment of the present disclosure, a network-side device configures a second RACH resource and a third RACH resource for a terminal, and sends configuration information indicating the second RACH resource and the third RACH resource configured for the terminal to the terminal. Based on the configured second RACH resource, the terminal determines that the first RO resource is a valid RO set on the SBFD symbol in the second RACH resource. Based on the configured third RACH resource, the terminal determines that the second RO resource is a valid RO set on the SBFD flexible symbols in the SBFD symbols in the third RACH resource and / or a valid RO set on the non-SBFD symbols in the third RACH resource. Therefore, the first RO resource is a valid RO set on the SBFD symbol in the second RACH resource, and the second RO resource is a valid RO set on the SBFD flexible symbols and / or on the non-SBFD symbols in the SBFD symbols in the third RACH resource.

[0599] In some embodiments, the processor 1110 is further configured to perform the following operations:

[0600] Determining indication information, where the indication information is used to indicate an RO resource to be used for the initial RACH attempt in the random access procedure;

[0601] Sending instruction information to the terminal.

[0602] In some embodiments, the processor 1110 is configured to determine the indication information, specifically including:

[0603] Determining the indication information through SIB configuration, where the indication information is used to indicate the RO resource to be adopted by the terminal in the initial RACH attempt during the initial random access process;

[0604] The indication information is determined through RRC configuration, where the indication information is used to indicate the RO resource to be adopted by the terminal in the initial RACH attempt during a non-initial random access process.

[0605] In the embodiment of the present disclosure, the network side device configures the indication information of the RO resource adopted by the first RACH attempt of the initial random access process through the SIB, and instructs the terminal to determine the RO resource preferentially adopted by the first RACH attempt of the initial random access process, or the network side device configures the indication information of the RO resource adopted by the first RACH attempt of the non-initial random access process through the RRC, and instructs the terminal to determine the RO resource preferentially adopted by the first RACH attempt of the subsequent random access process, thereby realizing flexible adjustment of the RO resource.

[0606] In some embodiments, the processor 1110 is further configured to perform the following operations:

[0607] determining a threshold configured for the terminal, where the threshold is used by the terminal to determine an RO resource to be used for an initial RACH attempt in a random access procedure;

[0608] The threshold is sent to the terminal.

[0609] In an embodiment of the present disclosure, a network-side device configures a threshold for a terminal and sends indication information including the threshold to the terminal, instructing the terminal to compare the RSRP measurement result corresponding to the reference signal index used in the initial RACH attempt with the threshold, or the terminal to compare the RSRP measurement result of the downlink path loss reference with the threshold, to determine the RO resource to be preferentially used in the initial RACH attempt in the random access process (including initial random access and / or subsequent random access), thereby improving the random access success rate and / or random access performance.

[0610] In some embodiments, the processor 1110 is further configured to perform the following operations:

[0611] Sending threshold indication information to the terminal;

[0612] The threshold indication information is used to indicate: when a comparison result of an RSRP measurement result and the threshold shows that the RSRP measurement result is greater than or equal to the threshold, RO resources to be used in an initial RACH attempt during the random access process; or when a comparison result shows that the RSRP measurement result is less than the threshold, RO resources to be used in an initial RACH attempt during the random access process;

[0613] or,

[0614] The threshold indication information is used to indicate: if the comparison result shows that the RSRP measurement result is greater than the threshold, the RO resource to be used in the initial RACH attempt during the random access process; or if the comparison result shows that the RSRP measurement result is less than or equal to the threshold, the RO resource to be used in the initial RACH attempt during the random access process;

[0615] The RSRP measurement result is an RSRP measurement result corresponding to a reference signal index adopted in an initial RACH attempt; or, the RSRP measurement result is an RSRP measurement result of a downlink path loss reference.

[0616] In the disclosed embodiment, the network side device sends threshold indication information to the terminal, so that the terminal can determine the RO resource to be used for the initial RACH attempt in the random access process according to the threshold indication information and the comparison result of the RSRP measurement result and the threshold, thereby improving the random access success rate and / or random access performance.

[0617] In some embodiments, the RO resource used in the initial RACH attempt during the random access process satisfies any of the following conditions:

[0618] In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource;

[0619] In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource;

[0620] In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource;

[0621] In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource.

[0622] In the embodiment of the present disclosure, when the target RACH resource is the first RACH resource, more RO access opportunities can be increased. When the target RACH resource includes the second RACH resource and the third RACH resource, the long PRACH format can be configured through the second RACH resource to increase coverage performance. The terminal can flexibly select the RO resource for the initial RACH attempt during the random access process for these two different situations, thereby improving the random access success rate and / or random access performance.

[0623] In some embodiments, the processor 1110 is further configured to perform the following operations:

[0624] The preamble sent by the terminal is received on the configured RO resource.

[0625] It should be noted here that the random access channel transmission resource selection device provided by the present disclosure can implement all the method steps implemented by the method embodiment described in the second aspect above, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those of the method embodiment will not be described in detail here.

[0626] FIG12 is a fourth structural diagram of a random access channel transmission resource selection apparatus provided in an embodiment of the present disclosure. As shown in FIG12 , the random access channel transmission resource selection apparatus provided in this embodiment is applied to a network-side device. The random access channel transmission resource selection apparatus 1200 provided in this embodiment includes:

[0627] A determining unit 1201 is configured to determine a target random access channel RACH resource configured for a terminal;

[0628] The sending unit 1202 is configured to send configuration information of a target RACH resource to the terminal, where the target RACH resource is used by the terminal to determine an RO resource to use for an initial RACH attempt during a random access process, and to switch RO resources for subsequent RACH attempts after a predefined condition is met.

[0629] In an embodiment of the present disclosure, a network-side device configures a target RACH resource for a terminal and sends configuration information of the target RACH resource to the terminal, so that the terminal determines the RACH resource based on the RACH resource location in the configuration information sent by the network-side device. The terminal determines, based on the RACH resource configured by the network-side device, to perform PRACH transmission on the RO resource used in the initial RACH attempt. If a predefined condition is met (for example, M attempts have failed, or interference is relatively large), the terminal can provide the ability to switch the RO resource to perform RO resource switching, switching to a symbol with less interference or easier successful access for random access. Based on the RO resource switching capability of the terminal, it can be applicable to terminals that can identify different symbol types, thereby improving the random access success rate and random access performance.

[0630] In some embodiments, the determining unit 1201 is further configured to:

[0631] Determine a maximum number of attempts to configure the terminal.

[0632] In some embodiments, the maximum number of attempts is the maximum number of attempts of the terminal on a first RO resource, where the first RO resource is determined by the terminal based on the target RACH resource; or, the maximum number of attempts is the maximum number of RACH attempts in one RACH process.

[0633] In an embodiment of the present disclosure, the maximum number of attempts configured by the network side device for the terminal is the maximum number of attempts on the first RO resource during a RACH process when the RACH attempt fails or the maximum number of RACH attempts in a RACH process, indicating that the terminal is switched to the RO resource used for subsequent RACH attempts after reaching the configured maximum number of attempts, or the terminal determines based on a received policy or local policy (for example, a predefined condition) that after reaching the configured maximum number of attempts, the RO resource is switched, thereby improving the random access success rate and the performance of random access.

[0634] In some embodiments, the target RACH resource is a first RACH resource, and the sending unit 1202 is specifically configured to:

[0635] Sending configuration information of the first RACH resource to the terminal; the first RACH resource is used by the terminal to determine the first RO resource and the second RO resource;

[0636] The first RO resource is a valid RO set on SBFD DL symbols in the first RACH resource, and the second RO resource is a valid RO set on SBFD flexible symbols in the first RACH resource and / or a valid RO set on non-SBFD symbols in the first RACH resource.

[0637] In an embodiment of the present disclosure, a network-side device configures a first RACH resource for a terminal and sends configuration information indicating the first RACH resource configured for the terminal to the terminal. Based on the configured first RACH resource, the terminal determines the first RO resource as a valid RO set on SBFD DL symbols in the first RACH resource, and determines the second RO resource as a valid RO set on SBFD flexible symbols in the first RACH resource and / or a valid RO set on non-SBFD symbols in the first RACH resource. Alternatively, based on the first RACH resource, the terminal determines the first RO resource as a valid RO set on SBFD symbols in the first RACH resource, and determines the second RO resource as a valid RO set on non-SBFD symbols in the first RACH resource. Therefore, the first RO resource is a valid RO set on SBFD symbols in the first RACH resource or on SBFD DL symbols in SBFD symbols, and the second RO resource is a valid RO set on SBFD flexible symbols and / or non-SBFD symbols in SBFD symbols in the first RACH resource.

[0638] In some embodiments, the target RACH resource includes a second RACH resource and a third RACH resource, and the sending unit 1202 is specifically configured to:

[0639] Sending configuration information of the second RACH resource and the third RACH resource to the terminal; the second RACH resource is used by the terminal to determine the first RO resource, and the third RACH resource is used by the terminal to determine the second RO resource;

[0640] The first RO resource is a valid RO set on SBFD symbols in the second RACH resource, and the second RO resource is a valid RO set on SBFD flexible symbols in the third RACH resource and / or a valid RO set on non-SBFD symbols in the third RACH resource.

[0641] In an embodiment of the present disclosure, a network-side device configures a second RACH resource and a third RACH resource for a terminal, and sends configuration information indicating the second RACH resource and the third RACH resource configured for the terminal to the terminal. Based on the configured second RACH resource, the terminal determines that the first RO resource is a valid RO set on the SBFD symbol in the second RACH resource. Based on the configured third RACH resource, the terminal determines that the second RO resource is a valid RO set on the SBFD flexible symbols in the SBFD symbols in the third RACH resource and / or a valid RO set on the non-SBFD symbols in the third RACH resource. Therefore, the first RO resource is a valid RO set on the SBFD symbol in the second RACH resource, and the second RO resource is a valid RO set on the SBFD flexible symbols and / or on the non-SBFD symbols in the SBFD symbols in the third RACH resource.

[0642] In some embodiments, the determining unit 1201 is further configured to:

[0643] Determining indication information, where the indication information is used to indicate an RO resource to be used for the initial RACH attempt in the random access procedure;

[0644] Sending instruction information to the terminal.

[0645] In some embodiments, the determining unit is specifically configured to:

[0646] Determining the indication information through SIB configuration, where the indication information is used to indicate the RO resource to be adopted by the terminal in the initial RACH attempt during the initial random access process;

[0647] The indication information is determined through RRC configuration, where the indication information is used to indicate the RO resource to be adopted by the terminal in the initial RACH attempt during a non-initial random access process.

[0648] In the embodiment of the present disclosure, the network side device configures the indication information of the RO resource adopted by the first RACH attempt of the initial random access process through the SIB, and instructs the terminal to determine the RO resource preferentially adopted by the first RACH attempt of the initial random access process, or the network side device configures the indication information of the RO resource adopted by the first RACH attempt of the subsequent non-initial random access process through the RRC, and instructs the terminal to determine the RO resource preferentially adopted by the first RACH attempt of the subsequent random access process, thereby realizing flexible adjustment of the RO resource.

[0649] In some embodiments, the determining unit 1201 is further configured to:

[0650] determining a threshold configured for the terminal, where the threshold is used by the terminal to determine an RO resource to be used for an initial RACH attempt in a random access procedure;

[0651] The threshold is sent to the terminal.

[0652] In an embodiment of the present disclosure, a network-side device configures a threshold for a terminal and sends indication information including the threshold to the terminal, instructing the terminal to compare the RSRP measurement result corresponding to the reference signal index used in the initial RACH attempt with the threshold, or the terminal to compare the RSRP measurement result of the downlink path loss reference with the threshold, to determine the RO resource to be preferentially used in the initial RACH attempt in the random access process (including initial random access and / or subsequent random access), thereby improving the random access success rate and / or random access performance.

[0653] In some embodiments, the sending unit 1202 is further configured to:

[0654] Sending threshold indication information to the terminal;

[0655] The threshold indication information is used to indicate: when a comparison result of an RSRP measurement result and the threshold shows that the RSRP measurement result is greater than or equal to the threshold, RO resources to be used in an initial RACH attempt during the random access process; or when a comparison result shows that the RSRP measurement result is less than the threshold, RO resources to be used in an initial RACH attempt during the random access process;

[0656] or,

[0657] The threshold indication information is used to indicate: if the comparison result shows that the RSRP measurement result is greater than the threshold, the RO resource to be used in the initial RACH attempt during the random access process; or if the comparison result shows that the RSRP measurement result is less than or equal to the threshold, the RO resource to be used in the initial RACH attempt during the random access process;

[0658] The RSRP measurement result is an RSRP measurement result corresponding to a reference signal index adopted in an initial RACH attempt; or, the RSRP measurement result is an RSRP measurement result of a downlink path loss reference.

[0659] In the disclosed embodiment, the network side device sends threshold indication information to the terminal, so that the terminal can determine the RO resource to be used for the initial RACH attempt in the random access process according to the threshold indication information and the comparison result of the RSRP measurement result and the threshold, thereby improving the random access success rate and / or random access performance.

[0660] In some embodiments, the RO resource used in the initial RACH attempt during the random access process satisfies any of the following conditions:

[0661] In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource;

[0662] In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource;

[0663] In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource;

[0664] In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource.

[0665] In the embodiment of the present disclosure, when the target RACH resource is the first RACH resource, more RO access opportunities can be increased. When the target RACH resource includes the second RACH resource and the third RACH resource, the long PRACH format can be configured through the second RACH resource to increase coverage performance. The terminal can flexibly select the RO resource for the initial RACH attempt during the random access process for these two different situations, thereby improving the random access success rate and / or random access performance.

[0666] In some embodiments, the apparatus further includes: a receiving unit; the receiving unit is configured to receive a preamble sent by the terminal on the configured RO resource.

[0667] It should be noted here that the random access channel transmission resource selection device provided by the present disclosure can implement all the method steps implemented by the method embodiment described in the second aspect above, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those of the method embodiment will not be described in detail here.

[0668] It should be noted that the division of units in the embodiments of the present disclosure is schematic and is merely a logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of the present disclosure may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0669] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of the present disclosure, or the part that contributes to the relevant technology, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute all or part of the steps of the method described in each embodiment of the present disclosure.

[0670] The present disclosure also provides a processor-readable storage medium that stores a computer program configured to cause a processor to execute any one of the above method embodiments.

[0671] Among them, the processor-readable storage medium can be any available medium or data storage device that can be accessed by the processor, including but not limited to magnetic storage (such as floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO)), optical storage (such as CDs, DVDs, BDs, HVDs, etc.), and semiconductor storage (such as ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drives (SSDs)), etc.

[0672] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present disclosure may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage, etc.) containing computer-usable program code.

[0673] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer-executable instructions. These computer-executable instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0674] These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the processor-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0675] Obviously, those skilled in the art may make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include these modifications and variations.

Claims

1. A method for selecting transmission resources of a random access channel, wherein: Applied to a terminal, the method includes: Determine the target random access channel (RACH) resource configured by the network side device; Determine the random access opportunity RO resource to be used for the initial RACH attempt in the random access process based on the target RACH resource, and perform physical random access channel PRACH transmission on the RO resource used for the initial RACH attempt; After the predefined conditions are met, subsequent RACH attempts are made by switching RO resources.

2. The method according to claim 1, wherein The predefined condition is that the number of failed RACH attempts in one RACH process reaches the maximum number of attempts.

3. The method according to claim 2, wherein: The maximum number of attempts in the predefined condition is the maximum number of attempts of the terminal on the first RO resource configured by the network side device, and the first RO resource is determined based on the target RACH resource; or, The maximum number of attempts in the predefined condition is the maximum number of RACH attempts of one RACH process configured by the network side device.

4. The method according to any one of claims 1 to 3, wherein: The determining, according to the target RACH resource, a random access opportunity RO resource to be used for the initial RACH attempt in the random access process includes: determining a first RO resource and a second RO resource according to the target RACH resource; An RO resource to be used for an initial RACH attempt in a random access procedure is determined from the first RO resource and the second RO resource.

5. The method according to claim 4, wherein The subsequent RACH attempt by switching RO resources includes: If the RO resource used in the initial RACH attempt is the first RO resource, after switching the RO resource, the subsequent RACH attempts use the second RO resource; If the RO resource used in the initial RACH attempt is the second RO resource, after the RO resource is switched, the subsequent RACH attempts use the first RO resource.

6. The method according to claim 4, wherein: The target RACH resource is a first RACH resource, and determining the first RO resource and the second RO resource according to the target RACH resource includes: Determining a first RO resource and a second RO resource according to the first RACH resource; The first RO resource is a valid RO set on a sub-band full-duplex downlink (SBFD) DL symbol in the first RACH resource, and the second RO resource is a valid RO set on a sub-band full-duplex flexible (SBFD) flexible symbol in the first RACH resource and / or a valid RO set on a non-SBFD symbol in the first RACH resource; or The first RO resource is a valid RO set on SBFD symbols in the first RACH resource, and the second RO resource is a valid RO set on non-SBFD symbols in the first RACH resource.

7. The method according to claim 4, wherein: The target RACH resource includes a second RACH resource and a third RACH resource, and determining the first RO resource and the second RO resource according to the target RACH resource includes: Determine the first RO resource according to the second RACH resource, where the first RO resource is a valid RO set on an SBFD symbol in the second RACH resource; The second RO resource is determined according to the third RACH resource, where the second RO resource is a valid RO set on SBFD flexible symbols in the third RACH resource and / or a valid RO set on non-SBFD symbols in the third RACH resource.

8. The method according to claim 4, wherein The determining, from the first RO resource and the second RO resource, of the RO resource to be used for the initial RACH attempt in the random access process includes any one of the following: Determine the RO resource to be used for the initial RACH attempt during random access according to the protocol predefined rules; Determining, according to the instruction information of the network side device, the RO resource to be used for the initial RACH attempt in the random access process; According to the threshold, the RO resource to be used for the initial RACH attempt in the random access process is determined.

9. The method according to claim 8, wherein The protocol predefined rule includes: when the network side device configures the first RO resource, the first RO resource is preferentially used in the initial RACH attempt during the random access process.

10. The method according to claim 8, wherein The indication information includes the RO resource used in the initial RACH attempt during the initial random access process and the RO resource used in the initial RACH attempt during the non-initial random access process; The RO resources used in the initial RACH attempt during the initial random access process are configured by the network side device through the system information block SIB, and the RO resources used in the initial RACH attempt during the non-initial random access process are configured by the network side device through the radio resource control RRC.

11. The method according to claim 8, wherein The determining, based on the threshold, of the RO resource to be used for the initial RACH attempt in the random access process includes: Determining, based on a comparison result of a reference signal received power (RSRP) measurement result and the threshold, an RO resource to be used for an initial RACH attempt in a random access process; The RSRP measurement result is an RSRP measurement result corresponding to a reference signal index adopted in an initial RACH attempt; or, the RSRP measurement result is an RSRP measurement result of a downlink path loss reference.

12. The method according to claim 11, wherein The determining, based on a comparison result of a reference signal received power (RSRP) measurement result and the threshold, an RO resource to be used for an initial RACH attempt in a random access process includes: determining, according to the threshold indication information of the network-side device and the comparison result, an RO resource to be used for an initial RACH attempt in a random access process; The threshold indication information is used to indicate: when the comparison result is that the RSRP measurement result is greater than or equal to the threshold, the RO resource to be used for the initial RACH attempt during the random access process; or, when the comparison result is that the RSRP measurement result is less than the threshold, the RO resource to be used for the initial RACH attempt during the random access process; or, The threshold indication information is used to indicate: when the comparison result shows that the RSRP measurement result is greater than the threshold, the RO resource to be used in the initial RACH attempt during the random access process; or when the comparison result shows that the RSRP measurement result is less than or equal to the threshold, the RO resource to be used in the initial RACH attempt during the random access process.

13. The method according to claim 11, wherein The RO resource used in the initial RACH attempt during the random access process meets any of the following conditions: In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used for the initial RACH attempt during the random access process is the first RO resource; If the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used for the initial RACH attempt during the random access process is the second RO resource; If the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used for the initial RACH attempt during the random access process is the second RO resource; If the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource.

14. A method for selecting transmission resources of a random access channel, wherein: Applied to a network-side device, the method includes: Determine a target random access channel RACH resource configured for the terminal; The configuration information of the target RACH resource is sent to the terminal, where the target RACH resource is used by the terminal to determine the RO resource to be used for the initial RACH attempt in the random access process, and to perform subsequent RACH attempts by switching the RO resource after a predefined condition is met.

15. The method according to claim 14, wherein The method further comprises: A maximum number of attempts configured for the terminal is determined.

16. The method according to claim 15, wherein The maximum number of attempts is the maximum number of attempts of the terminal on a first RO resource, where the first RO resource is determined by the terminal based on the target RACH resource; or the maximum number of attempts is the maximum number of RACH attempts in one RACH process.

17. The method according to any one of claims 14 to 16, wherein: The target RACH resource is a first RACH resource, and the sending configuration information of the target RACH resource to the terminal includes: Sending configuration information of the first RACH resource to the terminal; the first RACH resource is used by the terminal to determine the first RO resource and the second RO resource; The first RO resource is a valid RO set on SBFD DL symbols in the first RACH resource, and the second RO resource is a valid RO set on SBFD flexible symbols in the first RACH resource and / or a valid RO set on non-SBFD symbols in the first RACH resource.

18. The method according to any one of claims 14 to 16, wherein: The target RACH resource includes a second RACH resource and a third RACH resource, and the sending configuration information of the target RACH resource to the terminal includes: Sending configuration information of the second RACH resource and the third RACH resource to the terminal; the second RACH resource is used by the terminal to determine the first RO resource, and the third RACH resource is used by the terminal to determine the second RO resource; The first RO resource is a valid RO set on SBFD symbols in the second RACH resource, and the second RO resource is a valid RO set on SBFD flexible symbols in the third RACH resource and / or a valid RO set on non-SBFD symbols in the third RACH resource.

19. The method according to any one of claims 14 to 16, wherein: The method further comprises: Determining indication information, where the indication information is used to indicate an RO resource to be used for the initial RACH attempt in the random access procedure; Sending instruction information to the terminal.

20. The method according to claim 19, wherein The determination instruction information includes: Determining the indication information through SIB configuration, where the indication information is used to indicate the RO resource to be adopted by the terminal in the initial RACH attempt during the initial random access process; The indication information is determined through RRC configuration, where the indication information is used to indicate the RO resource to be adopted by the terminal in the initial RACH attempt during a non-initial random access process.

21. The method according to any one of claims 14 to 16, wherein: The method further comprises: determining a threshold configured for the terminal, where the threshold is used by the terminal to determine an RO resource to be used for an initial RACH attempt in a random access procedure; The threshold is sent to the terminal.

22. The method according to claim 21, wherein The method further comprises: Sending threshold indication information to the terminal; The threshold indication information is used to indicate: when a comparison result of an RSRP measurement result and the threshold shows that the RSRP measurement result is greater than or equal to the threshold, RO resources to be used in an initial RACH attempt during the random access process; or when a comparison result shows that the RSRP measurement result is less than the threshold, RO resources to be used in an initial RACH attempt during the random access process; or, The threshold indication information is used to indicate: if the comparison result shows that the RSRP measurement result is greater than the threshold, the RO resource to be used in the initial RACH attempt during the random access process; or if the comparison result shows that the RSRP measurement result is less than or equal to the threshold, the RO resource to be used in the initial RACH attempt during the random access process; The RSRP measurement result is an RSRP measurement result corresponding to a reference signal index adopted in an initial RACH attempt; or, the RSRP measurement result is an RSRP measurement result of a downlink path loss reference.

23. The method according to claim 21, wherein The RO resource used in the initial RACH attempt during the random access process meets any of the following conditions: In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; In a case where the target RACH resource is the first RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; if the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the second RO resource; In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than or equal to the threshold, the RO resource used for the initial RACH attempt during the random access process is the second RO resource; If the RSRP measurement result is less than the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; In a case where the target RACH resource includes a second RACH resource and a third RACH resource, if the RSRP measurement result is greater than the threshold, the RO resource used for the initial RACH attempt during the random access process is the second RO resource; If the RSRP measurement result is less than or equal to the threshold, the RO resource used in the initial RACH attempt during the random access process is the first RO resource; The RSRP measurement result is an RSRP measurement result corresponding to a reference signal index adopted in an initial RACH attempt; or, the RSRP measurement result is an RSRP measurement result of a downlink path loss reference.

24. The method according to any one of claims 14 to 16, wherein: The method further comprises: The preamble sent by the terminal is received on the configured RO resource.

25. A random access channel transmission resource selection device, wherein: The device is applied to a terminal and includes a memory, a transceiver, and a processor. Memory for storing computer programs; a transceiver, configured to transmit and receive data under the control of the processor; and a processor, configured to read the computer program in the memory and perform the following operations: Determine the target random access channel (RACH) resource configured by the network side device; Determine the random access opportunity RO resource to be used for the initial RACH attempt in the random access process based on the target RACH resource, and perform physical random access channel PRACH transmission on the RO resource used for the initial RACH attempt; After the predefined conditions are met, subsequent RACH attempts are made by switching RO resources.

26. The device according to claim 25, wherein The predefined condition is that the number of failed RACH attempts in one RACH process reaches the maximum number of attempts.

27. The apparatus according to claim 25, wherein The maximum number of attempts in the predefined condition is the maximum number of attempts of the terminal on the first RO resource configured by the network side device, and the first RO resource is determined based on the target RACH resource; or, The maximum number of attempts in the predefined condition is the maximum number of RACH attempts of one RACH process configured by the network side device.

28. The device according to any one of claims 25 to 27, wherein: The processor is configured to determine, based on the target RACH resource, a random access opportunity RO resource to be used in an initial RACH attempt during a random access process, including: determining a first RO resource and a second RO resource according to the target RACH resource; An RO resource to be used for an initial RACH attempt in a random access procedure is determined from the first RO resource and the second RO resource.

29. The apparatus according to claim 28, wherein The processor is configured to perform a subsequent RACH attempt by switching RO resources, including: If the RO resource used in the initial RACH attempt is the first RO resource, after switching the RO resource, the subsequent RACH attempts use the second RO resource; If the RO resource used in the initial RACH attempt is the second RO resource, after the RO resource is switched, the subsequent RACH attempts use the first RO resource.

30. A random access channel transmission resource selection device, wherein: The device is applied to a network side device, and includes: a memory, a transceiver, and a processor: A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations: Determine a target random access channel RACH resource configured for the terminal; The configuration information of the target RACH resource is sent to the terminal, where the target RACH resource is used by the terminal to determine the RO resource to be used for the initial RACH attempt in the random access process, and to perform subsequent RACH attempts by switching the RO resource after a predefined condition is met.

31. The device according to claim 30, wherein The processor is further configured to perform the following operations: A maximum number of attempts configured for the terminal is determined.

32. The apparatus according to claim 31, wherein The maximum number of attempts is the maximum number of attempts of the terminal on a first RO resource, where the first RO resource is determined by the terminal based on the target RACH resource; or the maximum number of attempts is the maximum number of RACH attempts in one RACH process.

33. A random access channel transmission resource selection device, wherein: The device is applied to a terminal, and includes: A first determining unit is configured to determine a target random access channel RACH resource configured by a network side device; A second determining unit is configured to determine, based on the target RACH resource, a random access opportunity RO resource to be used in an initial RACH attempt during a random access process, and perform a physical random access channel PRACH transmission on the RO resource used in the initial RACH attempt; The switching unit is configured to perform a subsequent RACH attempt by switching RO resources after a predefined condition is met.

34. A random access channel transmission resource selection device, wherein: The device is applied to a network side device, and the device includes: a determining unit, configured to determine a target random access channel RACH resource configured for the terminal; The sending unit is configured to send configuration information of a target RACH resource to the terminal, where the target RACH resource is used by the terminal to determine an RO resource to be used for an initial RACH attempt during a random access process, and to perform subsequent RACH attempts by switching the RO resource after a predefined condition is met.

35. A processor-readable storage medium, wherein: The processor-readable storage medium stores a computer program, and the computer program is configured to cause the processor to execute the method according to any one of claims 1 to 24.

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