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WO2025098348A1 - Procédé de communication et appareil de communication - Google Patents

Procédé de communication et appareil de communication Download PDF

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Publication number
WO2025098348A1
WO2025098348A1 PCT/CN2024/130020 CN2024130020W WO2025098348A1 WO 2025098348 A1 WO2025098348 A1 WO 2025098348A1 CN 2024130020 W CN2024130020 W CN 2024130020W WO 2025098348 A1 WO2025098348 A1 WO 2025098348A1
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WIPO (PCT)
Prior art keywords
value
values
mac
msg3
communication device
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PCT/CN2024/130020
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English (en)
Chinese (zh)
Inventor
周明月
徐修强
汪凡
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication of WO2025098348A1 publication Critical patent/WO2025098348A1/fr
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the present application relates to the field of wireless communication technology, and in particular to a communication method and a communication device.
  • a terminal device can access a network for communication by executing a random access (RA) process.
  • the terminal device can send a preamble on a physical random access channel (PRACH) resource.
  • PRACH physical random access channel
  • the network device can estimate the timing advance (TA) of the terminal device based on the preamble and send it to the terminal device through a random access response (RAR).
  • RAR random access response
  • the terminal device can send an uplink message to the network device based on the TA value.
  • the uplink message can be called Message 3 (Msg3).
  • CBRA contention-based random access
  • the present application provides a communication method and a communication device to improve the transmission performance of message 3 (Msg3) in a contention-based random access process, thereby improving the access success rate of a terminal device.
  • Msg3 message 3
  • the present application provides a communication method, comprising: receiving multiple messages Msg3 from a first communication device, the multiple Msg3 corresponding to multiple timing advance TA values, and the multiple TA values being carried in a message Msg2; sending a message Msg4 to the first communication device, the Msg4 being used to determine that the TA value of the first communication device is a first TA value among the multiple TA values.
  • the method may be executed by the second communication device, and may also be executed by a chip system, a hardware circuit and/or a software module applied in the second communication device.
  • the first communication device may be a terminal device
  • the second communication device may be a network device.
  • the second communication device can estimate multiple timing advance (TA) values by receiving an enhancement algorithm when receiving a preamble signal, and carry the multiple TA values in message 2 (Msg2) and send it to the first communication device.
  • the first communication device can receive Msg2, and after receiving Msg2, use the multiple TA values carried in Msg2 to send multiple messages 3 (Msg3) to the second communication device.
  • the preamble conflict can be understood as more than one first communication device sending the same preamble on the same random access channel (RACH) resource at the same time.
  • each Msg3 in multiple Msg3s may be the same.
  • the correspondence between multiple Msg3 and multiple TA values can be understood as multiple TA values can correspond one-to-one with multiple Msg3.
  • the first communication device can use each TA value in the multiple TA values to send a Msg3 to the first communication device once. At this time, the number of TA values is the same as the number of Msg3.
  • the correspondence between multiple Msg3 and multiple TA values can also be understood as each TA value in the multiple TA values can correspond to multiple Msg3.
  • the first communication device can use each TA value in the multiple TA values to repeatedly send the same Msg3 multiple times. In this case, the number of TA values is different from the number of Msg3.
  • the second communication device can receive multiple Msg3s sent by the first communication device, and can determine the content of message 4 (Msg4) based on the correctly received Msg3.
  • Msg4 can include a first TA value, thereby explicitly indicating that the TA value of the first communication device is the first TA value; correspondingly, the first communication device can receive Msg4, and determine that the TA value of the first communication device is the first TA value based on Msg4.
  • the first communication device can transmit multiple identical Msg3s to the second communication device based on multiple TA values carried in Msg2, which helps reduce the conflict of Msg3, improves the transmission and detection efficiency of Msg3, and improves the access success rate of the first communication device.
  • the second communication device can indicate the TA value of the first communication device to the first communication device through Msg4, so that the first communication device can obtain a more accurate TA value after completing random access, avoiding the need to adjust the TA value later, and shortening the time for adjusting the TA value.
  • the Msg2 includes multiple media access control sub-protocol data units MAC subPDUs, the multiple MAC subPDUs correspond one-to-one to the multiple TA values, and each MAC subPDU in the multiple MAC subPDUs includes a corresponding TA value.
  • Msg2 can carry multiple TA values through multiple media access control sub-protocol data units (MAC subPDUs).
  • MAC subPDUs media access control sub-protocol data units
  • multiple MAC subPDUs can correspond one-to-one to multiple TA values, and each MAC subPDU can contain a TA value, thereby enabling the sending of multiple TA values.
  • the multiple TA values correspond one-to-one to multiple uplink authorization UL grant information
  • each of the multiple UL grant information is carried in the MAC subPDU to which the corresponding TA value belongs, and each of the multiple UL grant information is used to indicate the time domain resources occupied by the corresponding TA value.
  • each MAC subPDU in the multiple MAC subPDUs may be a MAC subPDU3 in a media access control protocol data unit (MAC PDU) of a random access response (RAR).
  • MAC subPDU3 may also include uplink grant (UL grant) information to indicate the uplink resource used by the first communication device when transmitting Msg3 using each TA value, and the uplink resource may be a time domain resource and/or a frequency domain resource.
  • each MAC subPDU in the multiple MAC subPDUs also includes the number of repeated transmissions occupied by the corresponding TA value.
  • the first communication device when Msg3 supports repetition transmission, can use the same TA value on multiple time domain resources to repeatedly transmit the same Msg3 on the same frequency resource to improve the transmission performance of Msg3. Therefore, when multiple TA values are carried in Msg2, it is necessary to configure the corresponding number of repetition transmissions for each TA value, so each MAC subPDU in multiple MAC subPDUs can also include the number of repetition transmissions occupied by the corresponding TA value. It should be understood that the TA value corresponding to each MAC subPDU is the TA value contained in each MAC subPDU.
  • each MAC subPDU in multiple MAC subPDUs can also include UL grant information corresponding to the TA value.
  • the corresponding number of repeated transmissions and UL grant information are configured for each TA value, and the first communication device transmits Msg3 based on the number of repeated transmissions and UL grant information corresponding to each TA value, a large amount of signaling space and signaling overhead will be occupied, and the transmission efficiency will be low. Based on this, the corresponding number of repeated transmissions and UL grant information can be allocated to only one of the multiple TA values, and the number of repeated transmissions corresponding to the TA value can be allocated to multiple TA values to reduce the signaling space and signaling overhead and improve the transmission efficiency.
  • each MAC subPDU in the multiple MAC subPDUs can include the number of repeated transmissions occupied by the corresponding TA value, that is, the number of repeated transmissions allocated to each TA value in the number of repeated transmissions corresponding to one of the TA values. It should be noted that the number of TA values in the multiple TA values should be less than or equal to the number of repeated transmissions corresponding to one of the TA values.
  • the number of repeated transmissions occupied by each TA value among the multiple TA values may be allocated according to a preset rule, and the preset rule may be set according to actual needs, and no specific limitation is made here.
  • each MAC subPDU in multiple MAC subPDUs may also include UL grant information, and the UL grant information included in each MAC subPDU is consistent with the UL grant information corresponding to one of the TA values, so that the first communication device can realize the transmission of Msg3 based on the TA value included in each MAC subPDU, the number of repeated transmissions occupied by the TA value and the UL grant information.
  • one of the multiple MAC subPDUs further comprises: Contains UL grant information, where the UL grant information is used to indicate the time domain resources corresponding to each repeated transmission in the number of repeated transmissions occupied by the TA value corresponding to each MAC subPDU in the multiple MAC subPDUs.
  • UL grant information can be carried by only one of the multiple MAC subPDUs.
  • the UL grant information is consistent with the UL grant information corresponding to one of the TA values.
  • the UL grant information is used to indicate the time domain resources and/or frequency domain resources occupied by each of the multiple TA values, thereby saving signaling overhead.
  • the leading code identifier RAPID of each MAC subPDU in the multiple MAC subPDUs is the same.
  • the preamble identifier (RA preamble identifier, RAPID) of each MAC subPDU in the multiple MAC subPDUs can be made the same.
  • the UL grant information can be determined based on the RAPID of the MAC subPDU, so that the uplink resources (such as frequency domain resources and/or time domain resources) at each transmission of Msg3 can be determined, and then the transmission time point can be adjusted based on the TA value in the MAC subPDU to achieve the transmission of Msg3.
  • the Msg2 includes a MAC subPDU, and the MAC subPDU includes each TA value among the multiple TA values.
  • Msg2 can carry multiple TA values through one MAC subPDU, that is, Msg2 can include one MAC subPDU, and the MAC subPDU includes each TA value among the multiple TA values.
  • the MAC subPDU further includes the number of repeated transmissions occupied by each of the multiple TA values and/or UL grant information, and the UL grant information is used to indicate the time domain resources corresponding to each repeated transmission in the number of repeated transmissions occupied by each of the multiple TA values.
  • the corresponding repeated transmission times and UL grant information may be allocated to only one of the multiple TA values, and the repeated transmission times corresponding to the TA value may be allocated to multiple TA values. Therefore, the MAC subPDU included in Msg2 may also include the repeated transmission times occupied by each TA value to indicate the repeated transmission times when the first communication device uses each TA value to transmit Msg3. Among them, the repeated transmission times occupied by each TA value can be understood as the repeated transmission times allocated to each TA value among the repeated transmission times corresponding to one of the TA values.
  • the MAC subPDU included in Msg2 may also include UL grant information.
  • the UL grant information may be used to indicate the uplink resource corresponding to each transmission of Msg3 when the first communication device uses each TA value to transmit Msg3.
  • the uplink resource may be a frequency domain resource and/or a time domain resource.
  • the UL grant information is consistent with the UL grant information corresponding to one of the TA values.
  • the MAC subPDU also includes the number of TA values among the multiple TA values.
  • the MAC subPDU included in Msg2 may also include the number of TA values among multiple TA values to improve the accuracy of the first communication device transmitting Msg3 and avoid under-transmission or wrong transmission of Msg3.
  • each Msg3 in the multiple Msg3 includes an identifier of the first communication device, and the identifier of the first communication device includes user identity information.
  • the identifier of the first communication device may be carried in Msg3 according to the event type of Msg3.
  • the event type of Msg3 is cell radio network temporary identifier (C-RNTI) media access control element (MAC CE)
  • the first communication device already has a dedicated C-RNTI, and the identifier of the first communication device may be C-RNTI
  • the event type of Msg3 is common control channel service data unit (CCCH SDU)
  • Msg3 carries CCCH SDU such as radio resource control setup request (RRC setup request)
  • RRC setup request radio resource control setup request
  • the first communication device has not yet accessed the network
  • the identifier of the first communication device may be user identity information.
  • the user identity information can be understood as an identifier configured by the first communication device for itself, which is used to distinguish the user (user equipment, UE) from the identifiers of other first communication devices (contention resolution identity).
  • the user identity information may be an M-bit sequence, where M is a positive integer, or may be other information, which is not specifically limited here.
  • the user identity information may also be an identifier configured by the first communication device for itself and a temporary cell wireless network temporary identifier.
  • temporary cell radio network temporary identity TC-RNTI
  • TC-RNTI temporary cell radio network temporary identity
  • Msg2 Msg2
  • the event type of Msg3 is CCCH SDU
  • the first communication device uses the TC-RNTI carried in Msg2 as the identifier of the first communication device, it will conflict with the identifier of other first communication devices with preamble conflicts, so that the second communication device cannot determine the first communication device that transmits the Msg3 when receiving the Msg3, thereby affecting the communication efficiency.
  • the method provided in this implementation can solve this problem.
  • the Msg4 includes the user identity information.
  • the second communication device when it receives multiple Msg3s, it can determine the TA value of the first communication device based on the received Msg3s, and indicate the TA value of the first communication device to the first communication device through Msg4.
  • Msg4 can explicitly indicate the TA value of the first communication device.
  • Msg4 can include a first TA value, the first TA value is the TA value of the first communication device, and the first TA value is included in the multiple TA values.
  • Msg4 may only include the first TA value, and the second communication device may use C-RNTI to scramble Msg4 and then send it to the first communication device.
  • the identifier of the first communication device included in Msg4 may be information configured by the first communication device itself, or combination information of the information configured by the first communication device itself and TC-RNTI, which is not specifically limited here.
  • the identifier of the first communication device included in Msg3 when the identifier of the first communication device included in Msg3 is user identity information, the identifier of the first communication device may be included in Msg4, so that the first communication device avoids misdetection of Msg4 when detecting Msg4.
  • the identifier of the first communication device included in Msg4 may be determined as the C-RNTI of the first communication device, so that the first communication device can use C-RNTI for communication in subsequent communications.
  • the communication problem caused by the inability of the second communication device to distinguish the first communication device is avoided, and the communication efficiency is improved.
  • the Msg4 is carried in a sub-time domain resource among multiple sub-time domain resources, the multiple sub-time domain resources correspond one-to-one to the multiple TA values, and each sub-time domain resource among the multiple sub-time domain resources is used to transmit the Msg4 carrying the corresponding TA value.
  • Msg4 may implicitly indicate that the TA value of the first communication device is the first TA value.
  • the second communication device may divide the random access contention resolution timer of the physical downlink control channel (PDCCH) of Msg4 that the first communication device monitors into multiple sub-timers, each sub-timer corresponds to a TA value, each sub-timer does not overlap, and the duration of each sub-timer is the same.
  • the sub-timer can be understood as a sub-time domain resource. Therefore, the first communication device can monitor whether there is a Msg4 sent to itself within the start time window of each sub-timer. If the first communication device correctly receives the Msg4 in a sub-timer, it is considered that the TA value corresponding to the sub-timer is the first TA value of the first communication device.
  • the second communication device may configure the parameters (such as length, number, etc.) of each sub-timer to the first communication device in advance.
  • the channel quality of Msg3 corresponding to the first TA value meets a preset condition.
  • the channel quality may include a signal-to-noise ratio.
  • the TA value corresponding to the Msg3 with the largest signal-to-noise ratio among the multiple Msg3s may be used as the TA value of the first communication device, thereby improving the accuracy of the TA value of the first communication device.
  • the present application provides a communication method, the method comprising: sending multiple Msg3s to a second communication device, the multiple Msg3s corresponding to multiple TA values, the multiple TA values being carried in Msg2; receiving Msg4 from the second communication device, the Msg4 being used to determine that the TA value of the first communication device is the first TA value among the multiple TA values.
  • the method may be executed by the first communication device, and may also be executed by a chip system, a hardware circuit and/or a software module applied in the first communication device.
  • the first communication device may be a terminal device
  • the second communication device may be a network device.
  • the second communication device can estimate multiple TA values through a reception enhancement algorithm when receiving the preamble signal, and carry the multiple TA values in Msg2 and send them to the first communication device.
  • the first communication device can receive Msg2, and after receiving Msg2, use the multiple TA values carried in Msg2 to send multiple Msg3 to the second communication device.
  • the preamble conflict can be understood as more than one first communication device sending the same preamble on the same RACH resource at the same time.
  • each Msg3 in multiple Msg3s may be the same.
  • the correspondence between multiple Msg3 and multiple TA values can be understood as multiple TA values can correspond one-to-one with multiple Msg3.
  • the first communication device can use each TA value in the multiple TA values to send a Msg3 to the first communication device once, and at this time, the number of TA values is the same as the number of Msg3.
  • the correspondence between multiple Msg3 and multiple TA values can also be understood as each TA value in the multiple TA values can correspond to multiple Msg3.
  • the first communication device can use each TA value in the multiple TA values to repeatedly send the same Msg3 multiple times. At this time, the number of TA values is different from the number of Msg3.
  • the second communication device can receive multiple Msg3s sent by the first communication device, and can determine the content of Msg4 based on the correctly received Msg3.
  • Msg4 can include the first TA value, thereby explicitly indicating that the TA value of the first communication device is the first TA value; correspondingly, the first communication device can receive Msg4, and determine that the TA value of the first communication device is the first TA value based on Msg4.
  • the first communication device can transmit multiple identical Msg3s to the second communication device based on multiple TA values carried in Msg2, which helps reduce the conflict of Msg3, improves the transmission and detection efficiency of Msg3, and improves the access success rate of the first communication device.
  • the second communication device can indicate the TA value of the first communication device to the first communication device through Msg4, so that the first communication device can obtain a more accurate TA value after completing random access, avoiding the need to adjust the TA value later, and shortening the time for adjusting the TA value.
  • the Msg2 includes multiple MAC subPDUs, the multiple MAC subPDUs correspond one-to-one to the multiple TA values, and each MAC subPDU in the multiple MAC subPDUs includes a corresponding TA value.
  • Msg2 can carry multiple TA values through multiple MAC subPDUs.
  • multiple MAC subPDUs can correspond one-to-one to multiple TA values, and each MAC subPDU can contain a TA value, thereby enabling the sending of multiple TA values.
  • the multiple TA values correspond one-to-one to multiple UL grant information
  • each of the multiple UL grant information is carried in the MAC subPDU to which the corresponding TA value belongs, and each of the multiple UL grant information is used to indicate the time domain resources occupied by the corresponding TA value.
  • each MAC subPDU in the multiple MAC subPDUs may be MAC subPDU3 in the MAC PDU of the RAR.
  • MAC subPDU3 may also include UL grant information to indicate the uplink resource used by the first communication device when transmitting Msg3 using each TA value, and the uplink resource may be a time domain resource and/or a frequency domain resource.
  • each MAC subPDU in the multiple MAC subPDUs also includes the number of repeated transmissions occupied by the corresponding TA value.
  • the first communication device when Msg3 supports repeated transmission, can use the same TA value on multiple time domain resources to repeatedly transmit the same Msg3 on the same frequency resource to improve the transmission performance of Msg3. Therefore, when multiple TA values are carried in Msg2, it is necessary to configure the corresponding number of repeated transmissions for each TA value, so each MAC subPDU in multiple MAC subPDUs can also include the number of repeated transmissions occupied by the corresponding TA value. It should be understood that the TA value corresponding to each MAC subPDU is the TA value contained in each MAC subPDU.
  • each MAC subPDU in multiple MAC subPDUs can also include UL grant information corresponding to the TA value.
  • the corresponding number of repeated transmissions and UL grant information are configured for each TA value, and the first communication device transmits Msg3 based on the number of repeated transmissions and UL grant information corresponding to each TA value, a large amount of signaling space and signaling overhead will be occupied, and the transmission efficiency will be low. Based on this, the corresponding number of repeated transmissions and UL grant information can be allocated to only one of the multiple TA values, and the number of repeated transmissions corresponding to the TA value can be allocated to multiple TA values to reduce the signaling space and signaling overhead and improve the transmission efficiency.
  • Each MAC subPDU in the MAC subPDU may include the number of repetitions occupied by the corresponding TA value, that is, the number of repetitions allocated to each TA value in the number of repetitions corresponding to one of the TA values. It should be noted that the number of TA values in the multiple TA values should be less than or equal to the number of repetitions corresponding to one of the TA values.
  • the number of repeated transmissions occupied by each TA value among the multiple TA values may be allocated according to a preset rule, and the preset rule may be set according to actual needs, and no specific limitation is made here.
  • each MAC subPDU in multiple MAC subPDUs may also include UL grant information, and the UL grant information included in each MAC subPDU is consistent with the UL grant information corresponding to one of the TA values, so that the first communication device can realize the transmission of Msg3 based on the TA value included in each MAC subPDU, the number of repeated transmissions occupied by the TA value and the UL grant information.
  • one MAC subPDU among the multiple MAC subPDUs further includes UL grant information, and the UL grant information is used to indicate the time domain resources corresponding to each repeated transmission in the number of repeated transmissions occupied by the TA value corresponding to each MAC subPDU in the multiple MAC subPDUs.
  • UL grant information can be carried by only one of the multiple MAC subPDUs.
  • the UL grant information is consistent with the UL grant information corresponding to one of the TA values.
  • the UL grant information is used to indicate the time domain resources and/or frequency domain resources occupied by each of the multiple TA values, thereby saving signaling overhead.
  • the RAPID of each MAC subPDU in the multiple MAC subPDUs is the same.
  • the RAPID of each MAC subPDU in the multiple MAC subPDUs can be made the same.
  • the UL grant information can be determined based on the RAPID of the MAC subPDU, so that the uplink resources (such as frequency domain resources and/or time domain resources) at each transmission of Msg3 can be determined, and then the transmission time point can be adjusted based on the TA value in the MAC subPDU to realize the transmission of Msg3.
  • the Msg2 includes a MAC subPDU, and the MAC subPDU includes each TA value among the multiple TA values.
  • Msg2 can carry multiple TA values through one MAC subPDU, that is, Msg2 can include one MAC subPDU, and the MAC subPDU includes each TA value among the multiple TA values.
  • the MAC subPDU further includes the number of repeated transmissions occupied by each of the multiple TA values and/or UL grant information, and the UL grant information is used to indicate the time domain resources corresponding to each repeated transmission in the number of repeated transmissions occupied by each of the multiple TA values.
  • the corresponding repeated transmission times and UL grant information may be allocated to only one of the multiple TA values, and the repeated transmission times corresponding to the TA value may be allocated to multiple TA values. Therefore, the MAC subPDU included in Msg2 may also include the repeated transmission times occupied by each TA value to indicate the repeated transmission times when the first communication device uses each TA value to transmit Msg3. Among them, the repeated transmission times occupied by each TA value can be understood as the repeated transmission times allocated to each TA value among the repeated transmission times corresponding to one of the TA values.
  • the MAC subPDU included in Msg2 may also include UL grant information.
  • the UL grant information may be used to indicate the uplink resource corresponding to each transmission of Msg3 when the first communication device uses each TA value to transmit Msg3.
  • the uplink resource may be a frequency domain resource and/or a time domain resource.
  • the UL grant information is consistent with the UL grant information corresponding to one of the TA values.
  • the MAC subPDU also includes the number of TA values among the multiple TA values.
  • the MAC subPDU included in Msg2 may also include the number of TA values among multiple TA values to improve the accuracy of the first communication device transmitting Msg3 and avoid under-transmission or wrong transmission of Msg3.
  • each Msg3 in the multiple Msg3 includes an identifier of the first communication device, and the identifier of the first communication device includes user identity information.
  • the identifier of the first communication device may be carried in Msg3 according to the event type of Msg3.
  • the event type of Msg3 is C-RNTI MAC CE
  • the first communication device already has a dedicated C-RNTI
  • the identifier of the first communication device may be C-RNTI
  • the event type of Msg3 is CCCH SDU
  • Msg3 carries CCCH SDU such as RRC setup request
  • the first communication device has not yet accessed the network
  • the identifier of the first communication device may be user identity information.
  • User identity information may be understood as an identifier configured by the first communication device for itself, which is used as a UE contention resolution identifier to distinguish it from other first communication devices.
  • the user identity information may be an M-bit sequence, where M is a positive integer, or may be other information, which is not specifically limited here.
  • the user identity information may also be a combination of the identifier configured by the first communication device for itself and the TC-RNTI.
  • the TC-RNTI is carried in Msg2. It should be noted that the method of generating the user identity information by combining the identifier configured by the first communication device for itself with the TC-RNTI may be predefined by the protocol or may be configured by the second communication device, and is not specifically limited here.
  • the event type of Msg3 is CCCH SDU
  • the first communication device uses the TC-RNTI carried in Msg2 as the identifier of the first communication device, it will conflict with the identifier of other first communication devices with preamble conflicts, so that the second communication device cannot determine the first communication device that transmits the Msg3 when receiving the Msg3, thereby affecting the communication efficiency.
  • the method shown in this implementation can solve this problem.
  • the Msg4 includes the user identity information.
  • the second communication device when it receives multiple Msg3s, it can determine the TA value of the first communication device based on the received Msg3s, and indicate the TA value of the first communication device to the first communication device through Msg4.
  • Msg4 can explicitly indicate the TA value of the first communication device.
  • Msg4 can include a first TA value, the first TA value is the TA value of the first communication device, and the first TA value is included in the multiple TA values.
  • Msg4 may only include the first TA value, and the second communication device may use C-RNTI to scramble Msg4 and then send it to the first communication device.
  • Msg4 may include the first TA value and the identifier of the first communication device, and the second communication device may use the user identity information to scramble Msg4 and then send it to the first communication device.
  • the identifier of the first communication device included in Msg4 may be information configured by the first communication device itself, or combination information of the information configured by the first communication device itself and TC-RNTI, which is not specifically limited here.
  • the Msg4 is carried in a sub-time domain resource among multiple sub-time domain resources, the multiple sub-time domain resources correspond one-to-one to the multiple TA values, and each sub-time domain resource among the multiple sub-time domain resources is used to transmit the Msg4 carrying the corresponding TA value.
  • Msg4 may implicitly indicate that the TA value of the first communication device is the first TA value.
  • the second communication device may divide the random access contention resolution timer of the physical downlink control channel (PDCCH) of Msg4 that the first communication device monitors into multiple sub-timers, each sub-timer corresponds to a TA value, each sub-timer does not overlap, and the duration of each sub-timer is the same.
  • the sub-timer can be understood as a sub-time domain resource. Therefore, the first communication device can monitor whether there is a Msg4 sent to itself within the start time window of each sub-timer. If the first communication device correctly receives the Msg4 in a sub-timer, it is considered that the TA value corresponding to the sub-timer is the first TA value of the first communication device.
  • the second communication device may configure the parameters (such as length, number, etc.) of each sub-timer to the first communication device in advance.
  • the channel quality of Msg3 corresponding to the first TA value meets a preset condition.
  • the channel quality may include a signal-to-noise ratio.
  • the second communication device receives a signal including the identification of the same first communication device.
  • the TA value corresponding to the Msg3 with the largest signal-to-noise ratio among the multiple Msg3s can be used as the TA value of the first communication device, thereby improving the accuracy of the TA value of the first communication device.
  • the present application provides a communication device, which includes modules for implementing the method in the first aspect or any one of the implementations thereof, and each module can be implemented in the form of hardware and/or software.
  • the device may include: a receiving module and a sending module.
  • the receiving module is used to receive multiple Msg3s from a first communication device, where the multiple Msg3s correspond to multiple TA values and the multiple TA values are carried in Msg2; and the sending module is used to send Msg4 to the first communication device, where the Msg4 is used to determine that the TA value of the first communication device is the first TA value among the multiple TA values.
  • the Msg2 includes multiple MAC subPDUs, the multiple MAC subPDUs correspond one-to-one to the multiple TA values, and each MAC subPDU in the multiple MAC subPDUs includes a corresponding TA value.
  • the multiple TA values correspond one-to-one to multiple UL grant information
  • each of the multiple UL grant information is carried in the MAC subPDU to which the corresponding TA value belongs, and each of the multiple UL grant information is used to indicate the time domain resources occupied by the corresponding TA value.
  • each MAC subPDU in the multiple MAC subPDUs also includes the number of repeated transmissions occupied by the corresponding TA value.
  • one MAC subPDU among the multiple MAC subPDUs further includes UL grant information, and the UL grant information is used to indicate the time domain resources corresponding to each repeated transmission in the number of repeated transmissions occupied by the TA value corresponding to each MAC subPDU in the multiple MAC subPDUs.
  • the RAPID of each MAC subPDU in the multiple MAC subPDUs is the same.
  • the Msg2 includes a MAC subPDU, and the MAC subPDU includes each TA value among the multiple TA values.
  • the MAC subPDU further includes the number of repeated transmissions occupied by each of the multiple TA values and/or UL grant information, and the UL grant information is used to indicate the time domain resources corresponding to each repeated transmission in the number of repeated transmissions occupied by each of the multiple TA values.
  • the MAC subPDU also includes the number of TA values among the multiple TA values.
  • each of the multiple Msg3s includes an identifier of the first communication device, and the identifier of the first communication device includes user identity information.
  • the Msg4 includes the user identity information.
  • the Msg4 is carried in a sub-time domain resource among multiple sub-time domain resources, the multiple sub-time domain resources correspond one-to-one to the multiple TA values, and each sub-time domain resource among the multiple sub-time domain resources is used to transmit the Msg4 carrying the corresponding TA value.
  • the channel quality of Msg3 corresponding to the first TA value meets a preset condition.
  • the present application provides a communication device, which includes modules for implementing the method in the second aspect or any one of the implementations thereof, and each module can be implemented in the form of hardware and/or software.
  • the device may include: a sending module and a receiving module.
  • the sending module is used to send multiple Msg3s to the second communication device, wherein the multiple Msg3s correspond to multiple TA values and the multiple TA values are carried in Msg2; and the receiving module is used to receive Msg4 from the second communication device, wherein the Msg4 is used to determine that the TA value of the first communication device is the first TA value among the multiple TA values.
  • the Msg2 includes multiple MAC subPDUs, the multiple MAC subPDUs correspond one-to-one to the multiple TA values, and each MAC subPDU in the multiple MAC subPDUs includes a corresponding TA value.
  • the multiple TA values correspond one-to-one to multiple UL grant information
  • each of the multiple UL grant information is carried in the MAC subPDU to which the corresponding TA value belongs, and each of the multiple UL grant information is used to indicate the time domain resources occupied by the corresponding TA value.
  • each MAC subPDU in the multiple MAC subPDUs also includes the number of repeated transmissions occupied by the corresponding TA value.
  • one of the multiple MAC subPDUs further Contains UL grant information, where the UL grant information is used to indicate the time domain resources corresponding to each repeated transmission in the number of repeated transmissions occupied by the TA value corresponding to each MAC subPDU in the multiple MAC subPDUs.
  • the RAPID of each MAC subPDU in the multiple MAC subPDUs is the same.
  • the Msg2 includes a MAC subPDU, and the MAC subPDU includes each TA value among the multiple TA values.
  • the MAC subPDU further includes the number of repeated transmissions occupied by each of the multiple TA values and/or UL grant information, and the UL grant information is used to indicate the time domain resources corresponding to each repeated transmission in the number of repeated transmissions occupied by each of the multiple TA values.
  • the MAC subPDU also includes the number of TA values among the multiple TA values.
  • each of the multiple Msg3s includes an identifier of the first communication device, and the identifier of the first communication device includes user identity information.
  • the Msg4 includes the user identity information.
  • the Msg4 is carried in a sub-time domain resource among multiple sub-time domain resources, the multiple sub-time domain resources correspond one-to-one to the multiple TA values, and each sub-time domain resource among the multiple sub-time domain resources is used to transmit the Msg4 carrying the corresponding TA value.
  • the channel quality of Msg3 corresponding to the first TA value meets a preset condition.
  • the present application provides a communication device, including a processor, which can be coupled to a memory and is used to call a program code in the memory to execute the method as described in the first aspect or any possible implementation thereof.
  • the device also includes a memory.
  • the device also includes a communication interface, and the processor is coupled to the communication interface.
  • the apparatus may be a network device (such as a base station), or a chip system, a hardware circuit and/or a software module applied in a network device.
  • the present application provides a communication device, including a processor, which can be coupled to a memory and is used to call a program code in the memory to execute the method as described in the second aspect or any possible implementation thereof.
  • the device also includes a memory.
  • the device also includes a communication interface, and the processor is coupled to the communication interface.
  • the apparatus may be a terminal device, or a chip system, a hardware circuit and/or a software module applied in the terminal device.
  • the present application provides a communication system, which includes the device in the third aspect or the fifth aspect, and the device in the fourth aspect or the sixth aspect.
  • the present application provides a computer program product comprising instructions, which, when executed on a computer, enables the computer to execute the method described in the first aspect, the second aspect, or any possible implementation thereof.
  • the present application provides a computer-readable medium storing a program code for execution by a device, wherein the program code includes a method for executing the method described in the first aspect, the second aspect, or any possible implementation method thereof.
  • FIG1 is a schematic diagram of a communication system to which the present application is applicable
  • FIG2 is a schematic diagram of another communication system to which the present application is applicable.
  • FIG3 is an exemplary flow chart of a contention-based random access process
  • FIG4 is an exemplary flow chart of a communication method provided by an embodiment of the present application.
  • FIG5 is a schematic diagram of the structure of a RAR MAC PDU provided by an embodiment of the present application.
  • FIG6 is an exemplary diagram illustrating a random access provided by an embodiment of the present application.
  • FIG7 is a schematic diagram of the structure of a RAR MAC PDU provided by another embodiment of the present application.
  • FIG8 is a schematic diagram of the structure of a RAR MAC PDU provided in yet another embodiment of the present application.
  • FIG9 is a schematic diagram of the structure of a communication device provided by an embodiment of the present application.
  • FIG10 is a schematic diagram of the structure of a communication device provided in another embodiment of the present application.
  • a wireless communication system includes a communication device, and the communication devices can use air interface resources for wireless communication.
  • the communication device may include a network device and a terminal device.
  • the air interface resources may include at least one of time domain resources, frequency domain resources, code resources and space resources. In the embodiment of the present application, at least one can also be described as one or more, and multiple can be two, three, four or more, which is not limited in the present application.
  • the technical features in the technical feature are distinguished by “first”, “second”, “third”, “A”, “B”, “C” and “D”, and there is no order of precedence or size between the technical features described by the “first”, “second”, “third”, “A”, “B”, “C” and “D”.
  • the terminal device involved in the embodiment of the present application can be called a terminal, which is an entity on the user side for receiving or sending signals.
  • the terminal device can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; it can also be deployed on the water surface (such as ships, etc.); it can also be deployed in the air (such as airplanes, balloons and satellites, etc.).
  • the terminal device can be a user equipment (UE), wherein the UE includes a handheld device with wireless communication function, a vehicle-mounted device, a wearable device or a computing device.
  • the UE can be a mobile phone, a tablet computer or a computer with wireless transceiver function.
  • the terminal device can also be a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in telemedicine, a wireless terminal in a smart grid, a wireless terminal in a smart city, a wireless terminal in a smart home, etc.
  • the device for realizing the function of the terminal can be a terminal; it can also be a device that can support the terminal to realize the function, such as a chip system, which can be installed in the terminal.
  • the chip system may be composed of a chip, or may include a chip and other discrete devices.
  • the terminal device involved in the embodiments of the present application may be in a connected state or an activated state (active), or in an unconnected state (inactive) or an idle state (idle), and the present application does not impose any specific restrictions on this.
  • the network device involved in the embodiment of the present application may be an entity for transmitting and receiving signals, including access network equipment, such as a base station (BS), which may be a device deployed in a wireless access network and capable of wirelessly communicating with a terminal device.
  • a base station such as a base station (BS)
  • BS base station
  • the base station may have multiple forms, such as a macro base station, a micro base station, a relay station, and an access point.
  • the base station involved in the embodiment of the present application may be a base station in a fifth generation (5th generation, 5G) mobile communication system or an evolved base station (evolved node B, eNB or eNodeB) in LTE, wherein the base station in the 5G mobile communication system may also be referred to as a transmission reception point (TRP) or a 5G base station (next-generation node B, gNB).
  • the device for realizing the function of the network device may be a network device; it may also be a device that can support the network device to realize the function, such as a chip system, which may be installed in the network device.
  • Wireless communication between communication devices may include: wireless communication between network devices and terminal devices, wireless communication between network devices and network devices, and wireless communication between terminal devices and terminal devices.
  • wireless communication can also be referred to as “communication”
  • communication can also be described as "data transmission”, “information transmission” or “transmission”.
  • the technical solution provided in the embodiments of the present application is applicable to a 5G new radio (NR) system, and may also be applied to other communication systems, such as a sixth generation (6G) communication system, etc., as long as there is an entity in the communication system that sends configuration information to another entity, and sends data to another entity, or receives data sent by another entity; the other entity receives the configuration information, and sends data to the configuration information sending entity according to the configuration information, or receives data sent by the configuration information sending entity.
  • NR new radio
  • 6G sixth generation
  • FIG. 1 is a schematic diagram of a communication system applicable to the present application.
  • the configuration information sending entity may be a network device
  • the configuration information receiving entity may be a terminal device (such as a UE).
  • the communication system includes a network device 110, a UE 120, a UE 130, a UE 140, a UE 150, and a UE 160.
  • the number of terminal devices and network devices is merely an example, and the embodiments of the present application do not limit this.
  • the network device 110 can provide communication services for terminal devices (such as one or more of UE 120 to UE 160) in a cell.
  • the network device 110 can send configuration information to the terminal devices (such as one or more of UE 120 to UE 160) in the cell.
  • the configuration information can be control information or data information, which is not limited in the embodiments of the present application.
  • the terminal devices (such as one or more of UE 120 to UE 160) in the cell can send uplink data to the network device 110, and the network device 110 can also receive uplink data sent by the terminal devices (such as one or more of UE 120 to UE 160) in the cell.
  • UE 140, UE 150 and UE 160 may also form a communication system, such as a vehicle networking system.
  • both the configuration information sending entity and the configuration information receiving entity are terminal devices.
  • UE 140 can send configuration information to UE 150 and/or UE 160, and UE 140 can also receive data sent by UE 150 and/or UE 160;
  • UE 150 and/or UE 160 can receive configuration information sent by UE 140, and
  • UE 150 and/or UE 160 can send data to UE 140.
  • the technical solution provided in the embodiments of the present application can also be applied to a single-hop or multi-hop relay system including relay nodes.
  • FIG2 is a schematic diagram of another communication system applicable to the present application.
  • the communication system includes a network device 210, a terminal device 220, and a relay device 230.
  • the number of network devices, relay devices, and terminal devices is only an example, and the embodiments of the present application do not limit this.
  • the relay device 230 is an entity that can receive data from the network device 210, the terminal device 220 or other relay devices, and forward the received data to other terminal devices, other network devices or other relay devices.
  • the relay device 230 can be a small station, an integrated access and backhauling (IAB) node, a distributed unit (DU), a terminal device, a TRP, etc., and this application does not make specific restrictions on this.
  • a terminal device can access a network by executing a random access (RA) process, thereby communicating with network devices.
  • the random access process includes contention-based RA (CBRA).
  • Fig. 3 is an exemplary flow chart of a contention-based random access process. As shown in Fig. 3, the random access process includes S301 to S305.
  • the terminal device receives configuration information.
  • the network device may send a random access resource allocation instruction through a public radio resource control (RRC) signaling (such as a system information (SI)), thereby configuring a physical random access channel (PRACH) resource pool and a preamble resource pool for random access of the terminal device.
  • RRC public radio resource control
  • SI system information
  • PRACH physical random access channel
  • the terminal device sends message 1 to the network device.
  • the terminal device when it performs random access, it may send a random access request to the network device, and the random access request may be called message 1 (Msg1), and the random access request includes a preamble. Accordingly, the network device may receive Msg1.
  • Msg1 message 1
  • the network device may receive Msg1.
  • the terminal device when the terminal device performs random access, it can select a PRACH and a preamble from the configured PRACH resource pool and preamble resource pool respectively, and then send the selected preamble on the selected PRACH resource, thereby realizing the sending of the random access request.
  • the network device sends message 2 to the terminal device.
  • the network device may send a random access response (RAR) to the terminal device, and the RAR message may be carried in message 2 (Msg2) and sent to the terminal device.
  • the terminal device may receive Msg2.
  • Msg2 may include at least one of the following information: a preamble identifier (RA preamble identifier, RAPID), a timing advance command (TA), an uplink grant (UL grant) information, or a temporary cell radio network temporary identity (TC-RNTI).
  • RA preamble identifier RAPID
  • TA timing advance command
  • UL grant uplink grant
  • TC-RNTI temporary cell radio network temporary identity
  • RAPID is the identifier of the preamble obtained by the network device when detecting the preamble
  • the TA value is used to indicate the time adjustment amount required for the terminal device to perform uplink synchronization
  • the UL grant information is used to indicate the uplink resources allocated by the network device to the terminal device for transmitting message 3 (Msg3)
  • the uplink resources may be time domain resources and/or frequency domain resources
  • the TC-RNTI is used for subsequent data transmission between the terminal device and the network device.
  • the terminal device after the terminal device sends Msg1, it can determine a radio network temporary identity (RNTI) according to the PRACH resource that sends the preamble, and listen to the physical downlink control channel (PDCCH) encrypted with the RNTI within the Msg2 time window to receive the Msg2 corresponding to the RNTI.
  • RNTI radio network temporary identity
  • PDCCH physical downlink control channel
  • the Msg2 When the device successfully decodes a Msg2 using the RNTI, and the RAPID value in the Msg2 is the same as the index value used when the terminal device sent the preamble, the Msg2 is considered to be received successfully; if the terminal device monitors the PDCCH within the Msg2 time window but fails to correctly decode the Msg2, or the terminal device decodes the Msg2 but the PAPID in the Msg2 is different from the index value used when the terminal device sent the preamble, it is considered that the terminal device has not correctly received the Msg2, and the terminal device needs to re-execute S302, that is, the terminal device needs to retransmit the preamble.
  • the terminal device sends message 3 to the network device.
  • the terminal device can use the TA value to send Msg3 to the network device on the uplink resources indicated by UL grant.
  • the network device can receive Msg3.
  • the network device sends message 4 to the terminal device.
  • the network device may send message 4 (Msg4) to the terminal device in response to Msg3.
  • Msg4 may include contention resolution information to indicate that the contention resolution is successful. Accordingly, the terminal device may receive Msg4.
  • the contention resolution information may be a contention resolution identity media access control control element for a user (user equipment, UE).
  • the terminal device After sending Msg3, the terminal device starts or restarts the random access contention resolution timer (RA-contention resolution timer) and monitors the PDCCH of Msg4 within the time window of the timer. If the terminal device detects the PDCCH of Msg4, it can be considered that the contention has been resolved; if the terminal device does not receive the contention resolution information within the time window of the timer, the terminal device needs to re-execute S302, that is, the terminal device needs to retransmit the preamble.
  • RA-contention resolution timer random access contention resolution timer
  • Preamble conflicts can be understood as more than one terminal device sending the same preamble on the same random access channel (RACH) resource at the same time.
  • RACH random access channel
  • y rach is the preamble signal received by the network device, which is the superposition of the preamble signal y rach1 sent by terminal device 1 and the preamble signal y rach2 sent by terminal device 2
  • h 1 is the channel factor when terminal device 1 sends the preamble
  • h 2 is the channel factor when terminal device 2 sends the preamble
  • s rach is the preamble signal used by terminal device 1 and terminal device 2
  • n is noise.
  • the network device can estimate the TA value of terminal device 1 (such as TA 1 ) based on y rach1 , and the network device can estimate the TA value of terminal device 2 (such as TA 2 ) based on y rach2 ; however, when terminal device 1 and terminal device 2 send a preamble conflict, the TA value estimated by the network device based on y rach (such as TA est ) is the superposition of TA 1 and TA 2 , and is not the actual TA value of terminal device 1 and terminal device 2.
  • the network device After the network device estimates the TA value (such as TA est ) based on y rach , it can send Msg2 to the terminal device 1 and the terminal device 2 where the preamble conflict occurs. Since the terminal device 1 and the terminal device 2 use the same preamble, the RAPID used by the terminal device 1 and the terminal device 2 is also the same. Therefore, the terminal device 1 and the terminal device 2 can both transmit Msg3 according to the relevant information indicated in Msg2, resulting in the uplink resources and TA values used by the terminal device 1 and the terminal device 2 when transmitting Msg3 being consistent, which leads to the conflict of Msg3.
  • the network device estimates the TA value (such as TA est ) based on y rach .
  • the network device can estimate multiple TA values from the received preamble signal through the reception enhancement algorithm, and the multiple TA values include the TA values corresponding to the terminal device 1 and the terminal device 2, or the multiple TA values can also include the TA value that meets the error threshold, and the error threshold can be set according to actual needs.
  • the network device cannot determine the mapping relationship between the TA value and the terminal device, so the network device can send multiple TA values to the terminal device 1 and the terminal device 2 through Msg2. After receiving Msg2, the terminal device 1 and the terminal device 2 can select a TA value from multiple TA values for Msg3 transmission.
  • the terminal device 1 and the terminal device 2 can select a TA value from multiple TA values based on the historical TA, or randomly select a TA value from multiple TA values.
  • the randomness of the TA value selected by the terminal device 1 and the terminal device 2 from multiple TA values is relatively large, and the correctness of the selected TA value cannot be guaranteed, thereby the transmission performance of Msg3 cannot be guaranteed.
  • Fig. 4 is an exemplary flow chart of a communication method provided by an embodiment of the present application. As shown in Fig. 4, the method includes S401 and S402.
  • the first communication device sends a plurality of Msg3s to the second communication device, the plurality of Msg3s corresponding to a plurality of TA values, and the plurality of TA values are carried in Msg2.
  • the technical solution provided in the present application is explained by taking the first communication device as a terminal device and the second communication device as a network device as an example.
  • the network device can detect the preamble signal on the PRACH resource, and when the preamble signal is detected, estimate multiple TA values corresponding to the preamble signal through a receiving enhancement algorithm, which are marked as TA(1,1),...,TA(1,N) in sequence.
  • N represents the number of TA values among the multiple TA values estimated by the network device, and N is a positive integer.
  • the network device can construct a RAR for the preamble signal to carry the resource configuration required for subsequent Msg3 transmission, and send Msg2 carrying the RAR to the terminal device. Accordingly, the terminal device detects and receives Msg2. If the terminal device detects that the PARPID in Msg2 is the same as the index value used when the terminal device sends the preamble, it assumes that Msg2 belongs to itself.
  • a network device can carry the resource configuration required for Msg3 transmission through the media access control sub-protocol data unit (MAC subPDU) in the media access control protocol data unit (MAC PDU) of RAR.
  • MAC subPDU media access control sub-protocol data unit
  • MAC PDU media access control protocol data unit
  • Fig. 5 is a schematic diagram of the structure of a MAC PDU of RAR provided by an embodiment of the present application.
  • the MAC PDU includes MAC subPDU1, MAC subPDU2, multiple MAC subPDU3 and padding MAC subPDU (padding) (optional), and the number of MAC subPDU3 is the same as the number of TA values in the multiple TA values, both of which are N.
  • MAC subPDU1 only includes a backoff indicator (BI), and the subheader of MAC subPDU1 consists of an extension (E) field, a format (T) field, a reserved (R) field, an R field, and a BI field;
  • MAC subPDU2 only includes RAPID, and the subheader of MAC subPDU2 consists of an E field, a T field, and a RAPID field;
  • MAC subPDU3 includes RAPID and RAR, and the subheader of MAC subPDU3 consists of an E field, a T field, and a RAPID field.
  • the MAC RAR of MAC subPDU3 may include a TA value, UL grant information, and TC-RNTI.
  • the bit length occupied by the TA value may be 12 bits
  • the bit length occupied by the UL grant information may be 27 bits
  • the bit length occupied by the TC-RNTI may be 16 bits.
  • MAC subPDU3 can only support one TA value for one preamble, when the network device needs to send multiple TA values, it can send multiple MAC subPDU3s, that is, the MAC PDU can contain multiple MAC subPDU3s, and each MAC subPDU3 in the multiple MAC subPDU3s contains a TA value, thereby realizing the sending of multiple TA values. It should be noted that each MAC subPDU3 in the multiple MAC subPDU3s has the same RAPID and TC-RNTI, but has different TA values and UL grant information.
  • the UL grant information is used to indicate the uplink resources used by the terminal device when transmitting Msg3 using the TA value, such as frequency domain resources and/or time domain resources.
  • the terminal device can send multiple Msg3s containing the same information to the network device based on the TA value and UL grant information contained in each MAC subPDU3 in multiple MAC subPDU3s. Accordingly, the network device can receive multiple Msg3s.
  • multiple Msg3s correspond to multiple TA values, which can be understood as a one-to-one correspondence between multiple Msg3s and multiple TA values.
  • a terminal device when a terminal device sends Msg3 to a network device, it may carry the terminal device identifier, and the terminal device identifier may be related to the event type of Msg3.
  • the event type of Msg3 is cell radio network temporary identifier (C-RNTI) MAC CE
  • C-RNTI cell radio network temporary identifier
  • Msg3 carries C-RNTI MAC CE.
  • the terminal device already has a dedicated C-RNTI, and the terminal device identifier may be C-RNTI;
  • Msg3 carries CCCH SDU such as RRC setup request.
  • the terminal device has not successfully accessed the network, and the terminal device identifier may be user identity information.
  • User identity information can be understood as an identifier configured by the terminal device for itself, which is used to distinguish the UE contention resolution identity from the identifiers of other terminal devices.
  • the user identity information may be a sequence of M bits, where M is a positive integer, or other information, which is not specified in this application. Make specific limitations.
  • the user identity information may also be a combination of the identifier configured by the terminal device for itself and the TC-RNTI.
  • the TC-RNTI is carried in Msg2. It should be noted that the method of generating the user identity information by combining the identifier configured by the terminal device for itself with the TC-RNTI may be predefined by the protocol or configured by the network device, and is not specifically limited here.
  • the terminal device when the event type of Msg3 is CCCH SDU, if the terminal device uses TC-RNTI as the identifier of the terminal device, it will conflict with the identifiers of other terminal devices that have preamble conflicts, so that the network device cannot determine the terminal device that transmits the Msg3 when receiving the Msg3, thereby affecting the communication efficiency. Therefore, the terminal device can distinguish itself from other terminal devices that have preamble conflicts by generating user identity information.
  • the terminal device can use C-RNTI to scramble Msg3 and then transmit it to the network device.
  • the event type of Msg3 is CCCH SDU
  • the terminal device can use TC-RNTI to scramble Msg3 and then transmit it to the network device.
  • the network device may receive multiple Msg3s sent by the terminal device in each uplink resource indicated by each UL grant information included in Msg2, and send Msg4 to the terminal device to indicate that the contention resolution is successful.
  • the uplink resources may include time domain resources and/or frequency domain resources.
  • the Msg3 received by the network device in each uplink resource is the superposition of the Msg3s sent by multiple terminal devices in each uplink resource. Therefore, the network device needs to demodulate the Msg3 received in each uplink resource to achieve the correct reception of the Msg3 sent by each terminal device, and record the TA value corresponding to each correctly received Msg3, the identifier of the terminal device contained in the Msg3, and the event type of the Msg3.
  • the information of the i-th correctly received Msg3 can be ⁇ TA(i), UeId(i), Msg3Type(i) ⁇ , where TA(i) is the TA value corresponding to the i-th correctly received Msg3, UeId is the identifier of the terminal device, and Msg3Type is the event type of the Msg3.
  • the correct reception of Msg3 can be understood as the signal-to-noise ratio of Msg3 demodulated by the network device is greater than or equal to the signal-to-noise ratio threshold, and the signal-to-noise ratio threshold can be set according to actual needs, and this application does not make specific restrictions on this.
  • the network device can assist in the demodulation of Msg3 according to the channel information provided by Msg1 (such as the location of the terminal device, etc.).
  • the information of the correctly received Msg3 may also include an identifier of the uplink resource (such as a time slot) corresponding to the correctly demodulated Msg3.
  • the identifier may be understood as the network device receiving the correctly demodulated Msg3 in the uplink resource corresponding to the identifier.
  • the network device may determine the number and content of Msg4 to be sent based on the information of each Msg3 correctly received.
  • the network device can send the correctly received Msg3 information to the corresponding terminal device through Msg4.
  • the number of Msg4 sent down in this case is the same as the number of correctly received Msg3; if the identifiers of the terminal devices contained in some Msg3 are the same, it means that the terminal device corresponding to the identifier can use multiple TA values to successfully transmit multiple Msg3, and the network device can send the optimal TA value and the identifier of the terminal device to the terminal device corresponding to the identifier.
  • the optimal TA value of the terminal device can be understood as the maximum signal-to-noise ratio of the Msg3 received in the uplink resource corresponding to the TA value. Among them, the optimal TA value can also be called the first TA value.
  • Msg4 can contain the TA value and the identifier of the terminal device (such as user identity information), and the Msg4 can be sent to the terminal device after being encrypted with the identity information.
  • the user identity information can be the identifier configured by the terminal device for itself, or the combination of the identifier configured by the terminal device for itself and TC-RNTI, which is not specifically limited here.
  • the terminal device can receive Msg4.
  • the terminal device can detect the PDCCH of Msg4 within the time window of the random access contention resolution timer.
  • the event type of Msg3 is C-RNTI MAC CE
  • the terminal device successfully decodes the PDCCH of Msg4 using its C-RNTI it is considered that Msg4 is successfully received, and the terminal device considers that its access is successful
  • the event type of Msg3 is CCCH SDU
  • the terminal device successfully decodes the PDCCH of Msg4 using the user identity information it is considered that Msg4 is successfully received, and the terminal device considers that its access is successful.
  • the terminal device will use the user identity information indicated in Msg4 as C-RNTI for subsequent communications.
  • the terminal device can determine the first TA value carried in Msg4 as the TA of the terminal device. value, so that the terminal device can communicate with the network device subsequently based on the first TA value, and the first TA value belongs to multiple TA values.
  • Msg4 may include an identifier of the uplink resource (such as a time slot) correctly demodulated from Msg3, without including the first TA value, so that Msg4 can implicitly indicate the TA value of the terminal device.
  • the terminal device After the terminal device correctly receives Msg4, it can use the TA value in the MAC subPDU3 containing the uplink resource or the uplink resource identifier as the TA value of the terminal device based on the identifier of the uplink resource (such as a time slot) correctly demodulated from Msg3, so that the terminal device can perform subsequent communications based on the TA value, which is equivalent to re-confirming the TA value and avoiding the need for subsequent adjustment of the TA value.
  • the terminal device may use the first TA value to adjust the sending window of message 5 (Msg5) to respond to Msg4.
  • the terminal device can use different TA values in different uplink resources indicated by Msg2 to transmit the same Msg3 to the network device, which helps to reduce the conflict of Msg3, improves the transmission and detection efficiency of Msg3, and improves the access success rate of RACH.
  • the network device can indicate the TA value of the terminal device to the terminal device through Msg4, so that the terminal device can obtain a more accurate TA value after completing random access, avoiding the subsequent adjustment of the TA value, and shortening the time for adjusting the TA value.
  • the terminal device can carry the terminal device identification when transmitting Msg3, so that the network device can distinguish the terminal device based on the terminal device identification when receiving Msg3, thereby improving communication efficiency.
  • FIG6 is an exemplary illustration of a random access provided by an embodiment of the present application.
  • the terminal device 1 and the terminal device 2 shown in FIG6 send the same preamble on the same PRACH resource, that is, the two compete for access.
  • FIG6 shows the time axis of the network device side, the terminal device 1 side, and the terminal device 2 side.
  • the time T p1 at which the preamble signal sent by terminal device 1 is transmitted to the network device is earlier than the starting time T p of the receiving time window T 0 of the network device.
  • terminal device 1 needs to delay the sending of Msg3, that is, the TA value of terminal device 1 is greater than 0; correspondingly, the time T p2 at which the preamble signal sent by terminal device 2 is transmitted to the network device is later than the starting time T p of the receiving time window T 0 of the network device.
  • terminal device 2 In order to align the sending time or the receiving time window of the network device and improve the transmission performance of Msg3, terminal device 2 needs to send Msg3 in advance, that is, the TA value of terminal device 2 is less than 0. As shown in FIG6 , TA1 is the TA value of terminal device 1, and TA2 is the TA value of terminal device 2, then TA1>0, TA2 ⁇ 0.
  • the preamble signal received by the network device within T 0 is the superposition of the preamble signal sent by terminal device 1 and the preamble signal sent by terminal device 2.
  • the network device uses an enhanced reception algorithm (such as multi-domain joint estimation of TA) to estimate two TA values, such as TA1 and TA2, TA1>0, TA2 ⁇ 0.
  • the network device estimates TA1 and TA2, it generates Msg2 carrying 2 MAC subPDU3, and sends the Msg2 to terminal device 1 and terminal device 2 within T 1.
  • terminal device 1 and terminal device 2 can respectively use TA1 to send Msg3 within T2 indicated by UL grant1, and use TA2 to send Msg3 within T3 indicated by UL grant2.
  • T0 , T2 , and T3 can be understood as the receiving time window of the network device.
  • the first Msg3 received by the network device within T2 is the superposition of Msg3 transmitted by terminal device 1 and terminal device 2 based on the first MAC subPDU3
  • the second Msg3 received by the network device within T3 is the superposition of Msg3 transmitted by terminal device 1 and terminal device 2 based on the second MAC subPDU3.
  • terminal device 1 transmits Msg3 for the second time based on the second MAC subPDU3, since TA2 ⁇ 0, the time difference between the moment T m2 when the Msg3 is transmitted to the network device and the starting moment T 31 of T 3 increases from TA1 to the difference between TA1 and TA2, thereby reducing the integrity of the Msg3 received by the network device, and further reducing the success rate of the network device in demodulating the Msg3 from the second Msg3;
  • terminal device 2 transmits Msg3 for the second time based on the second MAC subPDU3, since TA2 ⁇ 0, the moment when the Msg3 is transmitted to the network device is aligned with the starting moment T 31 of T 3 , thereby allowing the network device to completely receive the Msg3, and further increasing the success rate of the network device in demodulating the Msg3 from the second Msg3.
  • the network device demodulates the first Msg3. If the network device successfully demodulates the first Msg3, Then the TA value (such as TA1), user identifier, type of Msg3 and identifier of uplink resource (such as UL grant1) of the successfully demodulated Msg3 corresponding to the successfully demodulated Msg3 are recorded; after the network device receives the second Msg3, it demodulates the second Msg3. If the network device successfully demodulates the second Msg3, the TA value (such as TA2), user identifier, type of Msg3 and identifier of uplink resource (such as UL grant2) of the successfully demodulated Msg3 are recorded.
  • the network device can determine the number and content of the sent Msg4 based on the demodulation results of the two Msg3s.
  • the network device can demodulate the Msg3 sent by terminal device 1 using TA1 from the first Msg3, and the network device can demodulate the Msg3 sent by terminal device 2 using TA2 from the second Msg3.
  • the network device can send a first Msg4 to the terminal device 1 within T 4 , and the first Msg4 carries TA1 and/or UL grant1 to indicate that TA1 is the TA value of the terminal device 1.
  • the network device can send a second Msg4 to the terminal device 2 within T 5 , and the second Msg4 carries TA2 and/or UL grant2 to indicate that TA2 is the TA value of the terminal device 2.
  • the terminal device 2 After the terminal device 2 successfully receives the second Msg4, it indicates that the terminal device 2 has successfully accessed the network, and the terminal device 2 can perform subsequent communication transmission based on TA2.
  • the network device can demodulate Msg3 in a smaller interference scenario, thereby improving the demodulation performance of Msg3, especially when the TA value difference between the terminal devices is large, the improvement effect of the demodulation performance of Msg3 is more obvious; the network device also obtains a more precise and accurate TA value of each terminal device, and sends the TA value to the corresponding terminal device through Msg4, and in the process of sending, Msg4 can also carry the terminal device identifier to avoid false detection of other terminal devices, thereby achieving more efficient and accurate terminal device conflict judgment.
  • this embodiment provides a method for implicitly carrying the TA value in Msg4.
  • the resources of the PDCCH for the terminal device to detect Msg4 can be divided into multiple sub-resources, and the multiple sub-resources correspond one-to-one to the multiple TA values estimated by the network device, and each of the multiple sub-resources is used to transmit Msg4 carrying the corresponding TA value.
  • the network device after the network device correctly receives Msg3 and determines the TA value of the terminal device, it can send Msg4 on the sub-resource corresponding to the TA value. If the terminal device correctly receives Msg4 on the sub-resource, the terminal device can consider the TA value corresponding to the sub-resource to be the TA value of the terminal device.
  • the mapping relationship between each sub-resource and the TA value can be predefined by the protocol or configured by the base station, and this application does not impose specific restrictions on this.
  • the resource of the PDCCH for detecting Msg4 by the terminal device may be a time domain resource.
  • the resource of the PDCCH for detecting Msg4 by the terminal device may be a time window of a random access contention resolution timer. Therefore, the random access contention resolution timer may be divided into a plurality of sub-timers, each sub-timer corresponding to a TA value, each sub-timer not overlapping with each other, and each sub-timer having the same duration.
  • the terminal device listens to whether there is a Msg4 sent to itself within the start time window of each sub-timer.
  • the TA value corresponding to the sub-timer is considered to be the first TA value of the terminal device.
  • the base station may configure the parameters (such as length, number, etc.) of each sub-timer to the terminal device in advance.
  • the TA value of the terminal device is implicitly indicated through the mapping relationship between the TA value and each sub-resource, thereby effectively avoiding false detection of the TA value field when Msg4 carries the TA value, improving communication efficiency, reducing the data carried in Msg4, and reducing signaling overhead.
  • Msg3 also supports repetition transmission, that is, the terminal device can use a TA value on multiple time domain resources to repeatedly transmit the same Msg3 on the same frequency resource, thereby improving the transmission performance of Msg3. Therefore, when Msg2 contains multiple TA values, it is necessary to configure the corresponding number of repetition transmissions and UL grant information for each TA value.
  • the UL grant information is used to indicate the time domain resources and/or frequency domain resources occupied by the TA value.
  • the number of time domain resources is the same as the number of repetition transmissions, so that the terminal device can achieve repeated transmission of Msg3.
  • this method occupies a large amount of signaling space and signaling overhead, and the transmission efficiency is low.
  • the embodiment of the present application proposes the following solution: only one of the multiple TA values is configured with the corresponding number of repeated transmissions and UL grant information, and the number of repeated transmissions corresponding to the TA value is allocated to the multiple TA values estimated by the network device.
  • the TA value configured with the number of repeated transmissions and UL grant information is called the second TA value.
  • the terminal device can use K repetition transmission times on the corresponding frequency resources.
  • the same Msg3 is sent K times using time domain resources.
  • each of the N TA values can occupy at least B repeated transmissions and B time domain resources, while the remaining C repeated transmissions and C time domain resources may not be used, or may be allocated to the TA value with the highest signal-to-noise ratio among the N TA values, or may be given to some of the N TA values in a preset order.
  • the preset order can be set according to actual needs, and this application does not impose specific restrictions on this. It should be understood that the number of TA values estimated by the network device should not exceed K, that is, 1 ⁇ N ⁇ K, and K is a positive integer.
  • the repeated transmission packet information corresponding to the i-th TA value can be recorded as: ⁇ TA(i), N TA (i), Rep(k i ),..., Rep(k i +N TA (i)-1) ⁇
  • TA(i) is the i-th TA value
  • N TA (i) is the number of repeated transmissions occupied by the i-th TA value
  • N TA (i) can be understood as the number of repeated transmissions allocated to the i-th TA value in the number of repeated transmissions corresponding to the second TA value
  • Rep(k i ),..., Rep(k i +N TA (i)-1) is the uplink resource corresponding to each repeated transmission when the i-th TA value occupies N TA (i) repeated transmissions
  • the uplink resource corresponding to each repeated transmission in the N TA (i) repeated transmissions is the continuous repeated transmission resources (such as time domain resources) corresponding to the k i -th to the (k i +N TA (i)-1)th repeated transmissions in the number of repeated transmissions corresponding to the second TA value.
  • the repeated transmission packet information can be carried in the MAC subPDU and sent to the corresponding terminal device through Msg2 for subsequent transmission of Msg3.
  • the number of bits occupied by N TA (i) can be determined based on the number of repeated transmissions of Msg3.
  • the number of repeated transmissions of Msg3 can be determined by the upper 2 bits of the modulation and coding scheme (MCS) in the UL grant.
  • MCS modulation and coding scheme
  • the maximum number of repeated transmissions of Msg3 is 16
  • the number of bits occupied by N TA (i) can be 4 bits.
  • the repeated transmission packet information can be carried in a MAC subPDU.
  • the MAC subPDU carrying the repeated transmission packet information in this example can be called MAC subPDU4.
  • Fig. 7 is a schematic diagram of the structure of a MAC PDU of RAR provided by another embodiment of the present application.
  • the MAC PDU includes MAC subPDU1, MAC subPDU2, MAC subPDU4 and padding MAC subPDU (padding) (optional).
  • MAC subPDU4 includes RAPID and RAR
  • the subheader of MAC subPDU4 consists of an E field, a T field and a RAPID field
  • the MAC RAR of MAC subPDU4 may include one or more of the following information: UL grant information, the number of TA values among multiple TA values, TA(1), N TA (1), ..., TA(N), N TA (N), or TC-RNTI.
  • TA(1) represents the first TA value among multiple TA values
  • N TA (1) represents the number of repeated transmissions occupied by the first TA value
  • TA(N) represents the Nth TA value among multiple TA values
  • N TA (N) represents the number of repeated transmissions occupied by the Nth TA value
  • the UL grant information is used to indicate the uplink resources (such as time domain resources and/or frequency domain resources) corresponding to each repeated transmission in the number of repeated transmissions occupied by each TA value among the N TA values
  • the UL grant information is consistent with the UL grant information corresponding to the second TA value.
  • the bit length occupied by the UL grant information may be 27 bits
  • the bit length occupied by the TA value may be 12 bits
  • the bit length occupied by the number of repeated transmissions occupied by the TA value may be 4 bits
  • the bit length occupied by the TC-RNTI may be 16 bits.
  • the MAC RAR in the MAC subPDU4 may also include an R field.
  • the bit length occupied by the R field may be 1 bit, which is not specifically limited in this application.
  • MAC subPDU4 can be dynamic or pre-configured in advance, and this application does not impose any restrictions on this.
  • the number N of TA values that can be supported for transmission in MAC subPDU4 can be determined by the number of repeated transmissions K of Msg3, for example, 1 ⁇ N ⁇ K.
  • MAC subPDU4 can be obtained by modifying MAC subPDU3, or MAC subPDU4 can be independently added to the MAC PDU. This application does not impose any specific restrictions on this.
  • the repeated transmission packet information can be carried in multiple MAC subPDUs, thereby reducing the signaling space of the MAC subPDU.
  • multiple MAC subPDUs may correspond to multiple TA values estimated by the network device, that is, each MAC subPDU includes a corresponding TA value. For example, when multiple MAC subPDUs correspond to multiple TA values one by one, each MAC subPDU includes a TA value, and the number of MAC subPDUs in the multiple MAC subPDUs is consistent with the number of TA values in the multiple TA values.
  • each MAC subPDU may also include the number of repeated transmissions occupied by the corresponding TA value, that is, the number of repeated transmissions allocated to each TA value in the number of repeated transmissions corresponding to the second TA value.
  • the TA value corresponding to each MAC subPDU can be understood as the TA value included in each MAC subPDU.
  • one of the multiple MAC subPDUs may include UL grant information, where the UL grant information is used to indicate the uplink resources (such as time domain resources and/or frequency domain resources) corresponding to each repeated transmission in the number of repeated transmissions occupied by each TA value among multiple TA values, and the UL grant information is consistent with the UL grant information corresponding to the second TA value.
  • the UL grant information is used to indicate the uplink resources (such as time domain resources and/or frequency domain resources) corresponding to each repeated transmission in the number of repeated transmissions occupied by each TA value among multiple TA values, and the UL grant information is consistent with the UL grant information corresponding to the second TA value.
  • the MAC subPDU containing the UL grant information may be MAC subPDU3.
  • MAC subPDU3 may also include TC-RNTI.
  • the RAPID of each MAC subPDU should be the same, so that when the terminal device transmits Msg3, it can determine the MAC subPDU carrying the UL grant information based on the RAPID, thereby determining the uplink resources of each transmitted Msg3, and then adjusting the transmission time point based on the TA value in the MAC subPDU, thereby realizing the transmission of Msg3.
  • Fig. 8 is a schematic diagram of the structure of a MAC PDU of RAR provided by another embodiment of the present application.
  • the MAC PDU includes MAC subPDU1, MAC subPDU2, MAC subPDU3, N-1 MAC subPDU5 and padding MAC subPDU (padding) (optional).
  • the MAC subPDU3 includes RAPID and RAR, the subheader of the MAC subPDU3 consists of an E field, a T field, and a RAPID field, and the MAC RAR of the MAC subPDU3 may include one or more of the following information: UL grant information, TA (1), N TA (1), or TC-RNTI.
  • the UL grant information is consistent with the UL grant information corresponding to the second TA value.
  • the MAC subPDU5 includes RAPID and RAR.
  • the subheader of MAC subPDU5 consists of the E field, T field and RAPID field.
  • the MAC RAR of MAC subPDU5 may include TA(u) and N TA (u), 2 ⁇ U ⁇ N.
  • the first MAC subPDU5 may include TA(2) and N TA (2)
  • the N-1th MAC subPDU5 may include TA(N) and N TA (N).
  • the RAPID in MAC subPDU3 is consistent with the RAPID of each MAC subPDU5 in N-1 MAC subPDU5s.
  • FIG9 is a schematic diagram of the structure of a communication device provided by an embodiment of the present application.
  • the communication device 900 may include: a receiving module 910 and a sending module 920 .
  • the device 900 may be used to implement each step/operation performed by the first communication device in the method shown in FIG. 4 .
  • the receiving module 910 can be used to implement the operation performed by the first communication device in S402; the sending module 920 can be used to implement the operation performed by the first communication device in S401.
  • the device 900 may be used to implement each step/operation performed by the second communication device in the method shown in FIG. 4 .
  • the receiving module 910 can be used to implement the operation performed by the second communication device in S401; the sending module 920 can be used to implement the operation performed by the second communication device in S402.
  • Fig. 10 is a schematic diagram of the structure of a communication device provided by another embodiment of the present application.
  • the device 1000 shown in Fig. 10 can be used to implement the method executed by the first communication device or the second communication device in any of the above embodiments.
  • the device 1000 of this embodiment includes: a memory 1010, a processor 1020, a communication interface 1030 and a bus 1040.
  • the memory 1010, the processor 1020 and the communication interface 1030 are connected to each other through the bus 1040.
  • the memory 1010 may be a read-only memory (ROM), a static storage device, a dynamic storage device or a random access memory (RAM).
  • the memory 1010 may store a program. When the program stored in the memory 1010 is executed by the processor 1020, the processor 1020 is used to execute the various steps/operations performed by the first communication device or the second communication device in any of the aforementioned embodiments.
  • Processor 1020 can adopt a general-purpose central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), or one or more integrated circuits to execute relevant programs to implement the communication method shown in the method embodiment of the present application.
  • CPU central processing unit
  • ASIC application specific integrated circuit
  • the processor 1020 may also be an integrated circuit chip with signal processing capability.
  • each step of the communication method shown in the method embodiment of the present application may be completed by an integrated logic circuit of hardware in the processor 1020 or by instructions in the form of software.
  • the processor 1020 may also be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices. Discrete gate or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general processor can be a microprocessor or the processor can also be any conventional processor, etc.
  • the steps of the method disclosed in the embodiment of the present application can be directly embodied as being executed by a hardware decoding processor, or being executed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc.
  • the storage medium is located in the memory 1010, and the processor 1020 reads the information in the memory 1010, and completes the functions required to be performed by the units included in the communication device of the present application in combination with its hardware. For example, each step/function performed by the first communication device or the second communication device in Figure 4 can be executed.
  • the memory 1010 and the processor 1020 may be integrated together.
  • the communication interface 1030 may use, but is not limited to, a transceiver or other transceiver device to implement communication between the apparatus 1000 and other devices or apparatuses.
  • the bus 1040 may include a path for transmitting information between various components of the device 1000 (eg, the memory 1010 , the processor 1020 , and the communication interface 1030 ).
  • a computer program product is also provided, which can implement the method shown in the above embodiments when the computer program product is run on a processor.
  • a computer-readable storage medium is also provided, which contains computer instructions, which can implement the method shown in the above embodiments when the computer instructions are run on a processor.
  • modules or components shown in the above embodiments may be one or more integrated circuits configured to implement the above methods, such as one or more application specific integrated circuits (ASICs), or one or more microprocessors (digital signal processors, DSPs), or one or more field programmable gate arrays (FPGAs), etc.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • FPGAs field programmable gate arrays
  • the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processors that can call program codes, such as a controller.
  • these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).
  • SOC system-on-a-chip
  • the above embodiments it can be implemented in whole or in part by software, hardware, firmware, software module or any combination thereof.
  • software When software is used for implementation, it can be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions. When loading and executing computer program instructions on a computer, the process or function according to the embodiment of the present application is generated in whole or in part.
  • the computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable devices.
  • the computer instruction can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instruction can be transmitted from a website site, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center.
  • the computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server, a data center, etc. that contains one or more available media integrations. Available media can be magnetic media (e.g., floppy disks, hard disks, tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid state drives (SSDs)).
  • plural in this article refers to two or more than two.
  • the term “and/or” in this article is only a description of the association relationship of associated objects, indicating that three relationships may exist.
  • a and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone.
  • the character "/" in this article generally indicates that the previous and next associated objects are in an "or” relationship; in the formula, the character "/" indicates that the previous and next associated objects are in a "division" relationship.
  • the size of the serial numbers of the above-mentioned processes does not mean the order of execution.
  • the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente demande propose un procédé de communication et un appareil de communication appliqués au domaine des communications. Dans la solution technique fournie par la présente demande, un premier appareil de communication peut transmettre une pluralité de Msg3 à un second appareil de communication sur la base d'une pluralité de valeurs TA émises par le second appareil de communication, la pluralité de Msg3 correspondant à la pluralité de valeurs TA ; et le second appareil de communication détermine un Msg4 sur la base de la pluralité de Msg3 reçue, et émet, au premier appareil de communication, le Msg4 pour déterminer une valeur TA du premier appareil de communication. La solution technique fournie par la présente demande permet de réduire le conflit du Msg3, et d'améliorer les performances de transmission du Msg3.
PCT/CN2024/130020 2023-11-10 2024-11-05 Procédé de communication et appareil de communication Pending WO2025098348A1 (fr)

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