Communication method and device

Abstract

The invention provides a communication method and device which are used for performing coverage enhancement on messages such as Msg4 and the like. The method comprises the following steps: sending at least one of the following information: a lead code or a logical channel identifier, wherein the information is used for requesting network equipment to send a first message carrying conflict resolution information in a random access process by adopting a repeated transmission mode; a first message is received. According to the method and the device, the first message is requested to be repeatedly transmitted to the network equipment through the preamble or the logic channel identifier, so that coverage enhancement of the first message can be realized, the success rate of random access is improved, the communication time delay is reduced, and the coverage range of the terminal equipment can be expanded.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a communication method and device. Background Art

[0002] It is currently proposed to expand the coverage of network equipment by reducing the edge rate, but after reducing the rate, some channels will have signal loss, such as message 2 (Msg2), physical uplink shared channel (PUSCH), message 4 (Msg4), etc. Among them, the existing protocol already supports the coverage enhancement of Msg2 and PUSCH channels. The PUSCH channel can support multiple repetitions through the time domain resource assignment (TDRA) configuration of the downlink control information (DCI) to achieve coverage enhancement. The Msg2 channel can achieve transmission block scaling through the transmission block (TB) scaling field, thereby improving coverage. However, other messages such as Msg4 currently have no definition in the protocol on how to perform coverage enhancement. Summary of the invention

[0003] The present application provides a communication method and device for enhancing the coverage of messages such as Msg4.

[0004] In a first aspect, a communication method is provided, wherein the executor of the method may be a terminal device or a chip, a chip system or a circuit located in the terminal device, and the method may be implemented by the following steps: sending a first message, wherein the first information is used to request a network device to send a first message carrying conflict resolution information during a random access process by repeated transmission, wherein the first information includes at least one of the following: a preamble code or a logical channel identifier; and receiving a first message.

[0005] The present application requests the network device to retransmit the first message through a preamble or a logical channel identifier, thereby achieving coverage enhancement of the first message, improving the success rate of random access, reducing communication delays, and improving the coverage range of the terminal device.

[0006] In one possible design, the first information is used to request the network device to send the first message in the random access process by repeated transmission, including: the first information includes a first preamble, and the first preamble is used to request to send the first message by repeated transmission. This method can save signaling overhead by requesting repeated transmission of the first message through preamble.

[0007] In one possible design, the first preamble belongs to a preamble set, and the preamble set may also include a second preamble, and the second preamble is used to indicate the repeated transmission of a second message in the random access process, and the second message is carried by a physical uplink shared channel. In this way, the first message or the second message can be flexibly scheduled for repeated transmission.

[0008] In one possible design, the first preamble is also used to request to send a second message in the random access process by repeated transmission, and the second message is carried by a physical uplink shared channel. In this way, the first message and the second message can be scheduled simultaneously and repeatedly scheduled, saving signaling overhead.

[0009] In one possible design, the first information is used to request the network device to send the first message in the random access process by repeated transmission, including: the first information is carried on the first random access resource, and the first random access resource is used to request to send the first message by repeated transmission. This method requests repeated transmission of the first message by random access resources, which can save signaling overhead.

[0010] In a possible design, the first information is used to request the network device to send the first message in the random access process by repeated transmission, including: the first information includes a first logical channel identifier, and the first logical channel identifier is used to request to send the first message by repeated transmission. This method requests repeated transmission of the first message by the logical channel identifier, which can save signaling overhead.

[0011] In one possible design, the value of the first logical channel identifier is 39, 40, 41, 42 or 47.

[0012] In one possible design, before sending the first information, the method also includes: receiving second information, where the second information is used to indicate the priority of repeated transmission of the first message.

[0013] In one possible design, the second information is included in system message block 1.

[0014] In one possible design, the method is applied to a 4-step random access process.

[0015] In one possible design, the first message is Msg4.

[0016] In one possible design, the second message is Msg3.

[0017] In one possible design, after sending the first information, the method also includes: receiving downlink control information (DCI), the DCI being scrambled by a temporary cell radio network temporary identifier (TC-RNTI), the DCI indicating configuration information for repeated transmission of a first message during a random access process, the first message carrying conflict resolution information; and receiving the first message according to the configuration information.

[0018] By adopting TC-RNTI encrypted DCI to configure repeated transmission of the first message, the terminal device can obtain the relevant configuration of repeated transmission of the first message before transmitting the first message, which is beneficial to improving the transmission performance of the first message, thereby improving the success rate of the random access process and reducing communication delay.

[0019] In one possible design, the DCI indicates configuration information for repeated transmission of the first message in the random access process, including: a modulation coding scheme (MCS) field in the DCI indicates the number of repeated transmissions of the first message. This method can save signaling overhead by reusing the MCS field to configure repeated transmission of the first message.

[0020] In one possible design, the MCS field in the DCI indicates the number of times the first message is repeatedly transmitted, including: part of the high-order bits (MSBs) of the MCS field indicates the number of times the first message is repeatedly transmitted.

[0021] In one possible design, the DCI indicates configuration information for repeated transmission of the first message in the random access process, including: a downlink allocation index field in the DCI indicates the number of times the first message is repeatedly transmitted. This method can save signaling overhead by reusing the downlink allocation index field to configure repeated transmission of the first message.

[0022] In one possible design, the downlink allocation index field in the DCI is used to indicate repeated transmission or non-repeated transmission of the first message, and the MCS field in the DCI is used to indicate the number of repeated transmissions of the first message when the downlink allocation index field indicates repeated transmission of the first message. This method can save signaling overhead by multiplexing the MCS field and the downlink allocation index field to configure repeated transmission of the first message.

[0023] In one possible design, the downlink allocation index field in the DCI is used to indicate repeated transmission or non-repeated transmission of the first message, including: 1 bit in the downlink allocation index field is used to indicate repeated transmission or non-repeated transmission of the first message.

[0024] In one possible design, the MCS field is used to indicate the number of repeated transmissions of the first message when the downlink allocation index field indicates repeated transmission of the first message, including: part of the MSB of the MCS field is used to indicate the number of repeated transmissions of the first message when the downlink allocation index field indicates repeated transmission of the first message.

[0025] In one possible design, the MCS field in the DCI is used to indicate repeated transmission or non-repeated transmission of the first message, and the downlink allocation index field in the DCI is used to indicate the number of repeated transmissions of the first message when the MCS field indicates repeated transmission of the first message. This method can save signaling overhead by multiplexing the MCS field and the downlink allocation index field to configure repeated transmission of the first message.

[0026] In one possible design, the MCS field is used to indicate repeated transmission or non-repeated transmission of the first message, including: the highest bit of the MCS field is used to indicate repeated transmission or non-repeated transmission of the first message.

[0027] In one possible design, the DCI format is format 1-0.

[0028] In one possible design, after sending the first information, the method also includes: receiving a random access response uplink grant (RAR UL grant), the RAR UL grant indicating configuration information for repeated transmission of the first message in the random access process, the first message carrying conflict resolution information; receiving the first message according to the configuration information.

[0029] By configuring repeated transmission of the first message through RAR UL grant, the terminal device can obtain the relevant configuration of repeated transmission of the first message before transmitting the first message, which is beneficial to improving the transmission performance of the first message, thereby improving the success rate of the random access process and reducing communication delay.

[0030] In one possible design, the RAR UL grant indicates configuration information for repeated transmission of the first message in the random access process, including: the time domain resource allocation field in the RAR UL grant indicates configuration information for repeated transmission of the first message. This method can save signaling overhead by multiplexing the time domain resource allocation field to configure repeated transmission of the first message.

[0031] In one possible design, the N states of the time domain resource allocation field correspond one-to-one to N repeated transmission times, where N is an integer greater than 0.

[0032] In one possible design, the RAR UL grant indicates configuration information for repeated transmission of the first message in the random access process, including: the frequency domain resource allocation field and the frequency hopping field in the RAR UL grant indicate configuration information for repeated transmission of the first message. This method can save signaling overhead by multiplexing the frequency domain resource allocation field and the frequency hopping field to configure repeated transmission of the first message.

[0033] In one possible design, the frequency domain resource allocation field and the frequency hopping field indicate configuration information for repeated transmission of the first message, including: P bits indicating the number of times the first message is repeatedly transmitted, the P bits including at least one bit in the frequency domain resource allocation field and at least one bit in the frequency hopping field, and P is an integer greater than 1.

[0034] In a second aspect, a communication method is provided, the execution subject of the method may be a network device or a chip, a chip system or a circuit located in the network device, and the method may be implemented by the following steps: receiving first information, the first information is used to request the network device to send a first message in a random access process by repeated transmission, the first message carries conflict resolution information, and the first information includes at least one of the following: a preamble or a logical channel identifier. The first message is sent by repeated transmission.

[0035] The present application requests the network device to retransmit the first message through a preamble or a logical channel identifier, thereby achieving coverage enhancement of the first message, improving the success rate of random access, reducing communication delays, and improving the coverage range of the terminal device.

[0036] In one possible design, the first information is used to request the network device to send the first message in the random access process by repeated transmission, including: the first information includes a first preamble, and the first preamble is used to request to send the first message by repeated transmission. This method can save signaling overhead by requesting repeated transmission of the first message through preamble.

[0037] In one possible design, the first preamble belongs to a preamble set, and the preamble set may also include a second preamble, and the second preamble is used to indicate the repeated transmission of a second message in the random access process, and the second message is carried by a physical uplink shared channel. In this way, the first message or the second message can be flexibly scheduled for repeated transmission.

[0038] In one possible design, the first preamble is also used to request to send a second message in the random access process by repeated transmission, and the second message is carried by a physical uplink shared channel. In this way, the first message and the second message can be scheduled simultaneously and repeatedly scheduled, saving signaling overhead.

[0039] In one possible design, the first information is used to request the network device to send the first message in the random access process by repeated transmission, including: the first information is carried on the first random access resource, and the first random access resource is used to request to send the first message by repeated transmission. This method requests repeated transmission of the first message by random access resources, which can save signaling overhead.

[0040] In a possible design, the first information is used to request the network device to send the first message in the random access process by repeated transmission, including: the first information includes a first logical channel identifier, and the first logical channel identifier is used to request to send the first message by repeated transmission. This method requests repeated transmission of the first message by the logical channel identifier, which can save signaling overhead.

[0041] In one possible design, the value of the first logical channel identifier is 39, 40, 41, 42 or 47.

[0042] In one possible design, before receiving the first information, the method also includes: sending second information, where the second information is used to indicate the priority of repeated transmission of the first message.

[0043] In one possible design, the second information is included in system message block 1.

[0044] In one possible design, the method is applied to a 4-step random access process.

[0045] In one possible design, the first message is Msg4.

[0046] In one possible design, the second message is Msg3.

[0047] In one possible design, after receiving the first information, the method also includes: sending DCI, the DCI is encrypted by TC-RNTI, the DCI indicates configuration information for repeated transmission of the first message in the random access process, and the first message carries conflict resolution information; and sending the first message according to the configuration information.

[0048] By adopting TC-RNTI encrypted DCI to configure repeated transmission of the first message, the terminal device can obtain the relevant configuration of repeated transmission of the first message before transmitting the first message, which is beneficial to improving the transmission performance of the first message, thereby improving the success rate of the random access process and reducing communication delay.

[0049] In one possible design, the DCI indicates configuration information for repeated transmission of the first message in the random access process, including: the MCS field in the DCI indicates the number of repeated transmissions of the first message. This method can save signaling overhead by reusing the MCS field to configure repeated transmission of the first message.

[0050] In one possible design, the MCS field in the DCI indicates the number of times the first message is repeatedly transmitted, including: part of the MSB of the MCS field indicates the number of times the first message is repeatedly transmitted.

[0051] In one possible design, the DCI indicates configuration information for repeated transmission of the first message in the random access process, including: a downlink allocation index field in the DCI indicates the number of times the first message is repeatedly transmitted. This method can save signaling overhead by reusing the downlink allocation index field to configure repeated transmission of the first message.

[0052] In one possible design, the downlink allocation index field in the DCI is used to indicate repeated transmission or non-repeated transmission of the first message, and the MCS field in the DCI is used to indicate the number of repeated transmissions of the first message when the downlink allocation index field indicates repeated transmission of the first message. This method can save signaling overhead by multiplexing the MCS field and the downlink allocation index field to configure repeated transmission of the first message.

[0053] In one possible design, the downlink allocation index field in the DCI is used to indicate repeated transmission or non-repeated transmission of the first message, including: 1 bit in the downlink allocation index field is used to indicate repeated transmission or non-repeated transmission of the first message.

[0054] In one possible design, the MCS field is used to indicate the number of repeated transmissions of the first message when the downlink allocation index field indicates repeated transmission of the first message, including: part of the MSB of the MCS field is used to indicate the number of repeated transmissions of the first message when the downlink allocation index field indicates repeated transmission of the first message.

[0055] In one possible design, the MCS field in the DCI is used to indicate repeated transmission or non-repeated transmission of the first message, and the downlink allocation index field in the DCI is used to indicate the number of repeated transmissions of the first message when the MCS field indicates repeated transmission of the first message. This method can save signaling overhead by multiplexing the MCS field and the downlink allocation index field to configure repeated transmission of the first message.

[0056] In one possible design, the MCS field is used to indicate repeated transmission or non-repeated transmission of the first message, including: the highest bit of the MCS field is used to indicate repeated transmission or non-repeated transmission of the first message.

[0057] In one possible design, the DCI format is format 1-0.

[0058] In one possible design, after receiving the first information, the method further includes: sending a RAR UL grant, where the RAR UL grant indicates configuration information for repeated transmission of a first message in a random access process, and the first message carries conflict resolution information; and sending the first message according to the configuration information.

[0059] By configuring repeated transmission of the first message through RAR UL grant, the terminal device can obtain the relevant configuration of repeated transmission of the first message before transmitting the first message, which is beneficial to improving the transmission performance of the first message, thereby improving the success rate of the random access process and reducing communication delay.

[0060] In one possible design, the RAR UL grant indicates configuration information for repeated transmission of the first message in the random access process, including: the time domain resource allocation field in the RAR UL grant indicates configuration information for repeated transmission of the first message. This method can save signaling overhead by multiplexing the time domain resource allocation field to configure repeated transmission of the first message.

[0061] In one possible design, the N states of the time domain resource allocation field correspond one-to-one to N repeated transmission times, where N is an integer greater than 0.

[0062] In one possible design, the RAR UL grant indicates configuration information for repeated transmission of the first message in the random access process, including: the frequency domain resource allocation field and the frequency hopping field in the RAR UL grant indicate configuration information for repeated transmission of the first message. This method can save signaling overhead by multiplexing the frequency domain resource allocation field and the frequency hopping field to configure repeated transmission of the first message.

[0063] In one possible design, the frequency domain resource allocation field and the frequency hopping field indicate configuration information for repeated transmission of the first message, including: P bits indicating the number of times the first message is repeatedly transmitted, the P bits including at least one bit in the frequency domain resource allocation field and at least one bit in the frequency hopping field, and P is an integer greater than 1.

[0064] According to a third aspect, a communication method is provided. The execution subject of the method may be a terminal device or a chip, a chip system or a circuit located in the terminal device. The method may be implemented by the following steps: receiving DCI, the DCI being encrypted by TC-RNTI, and the DCI indicating configuration information for repeated transmission of the first message in the random access process, the first message carrying conflict resolution information; and receiving the first message according to the configuration information.

[0065] The present application adopts TC-RNTI encrypted DCI to configure repeated transmission of the first message, so that the terminal device can obtain the relevant configuration of repeated transmission of the first message before transmitting the first message, which is beneficial to improving the transmission performance of the first message, thereby improving the success rate of the random access process and reducing communication delay.

[0066] In one possible design, the DCI indicates configuration information for repeated transmission of the first message in the random access process, including: the MCS field in the DCI indicates the number of repeated transmissions of the first message. This method can save signaling overhead by reusing the MCS field to configure repeated transmission of the first message.

[0067] In one possible design, the MCS field in the DCI indicates the number of times the first message is repeatedly transmitted, including: part of the MSB of the MCS field indicates the number of times the first message is repeatedly transmitted.

[0068] In one possible design, the DCI indicates configuration information for repeated transmission of the first message in the random access process, including: a downlink allocation index field in the DCI indicates the number of times the first message is repeatedly transmitted. This method can save signaling overhead by reusing the downlink allocation index field to configure repeated transmission of the first message.

[0069] In one possible design, the downlink allocation index field in the DCI is used to indicate repeated transmission or non-repeated transmission of the first message, and the MCS field in the DCI is used to indicate the number of repeated transmissions of the first message when the downlink allocation index field indicates repeated transmission of the first message. This method can save signaling overhead by multiplexing the MCS field and the downlink allocation index field to configure repeated transmission of the first message.

[0070] In one possible design, the downlink allocation index field in the DCI is used to indicate repeated transmission or non-repeated transmission of the first message, including: 1 bit in the downlink allocation index field is used to indicate repeated transmission or non-repeated transmission of the first message.

[0071] In one possible design, the MCS field is used to indicate the number of repeated transmissions of the first message when the downlink allocation index field indicates repeated transmission of the first message, including: part of the MSB of the MCS field is used to indicate the number of repeated transmissions of the first message when the downlink allocation index field indicates repeated transmission of the first message.

[0072] In one possible design, the MCS field in the DCI is used to indicate repeated transmission or non-repeated transmission of the first message, and the downlink allocation index field in the DCI is used to indicate the number of repeated transmissions of the first message when the MCS field indicates repeated transmission of the first message. This method can save signaling overhead by multiplexing the MCS field and the downlink allocation index field to configure repeated transmission of the first message.

[0073] In one possible design, the MCS field is used to indicate repeated transmission or non-repeated transmission of the first message, including: the highest bit of the MCS field is used to indicate repeated transmission or non-repeated transmission of the first message.

[0074] In one possible design, the DCI format is format 1-0.

[0075] In one possible design, before sending the first information, the method also includes: receiving second information, where the second information is used to indicate the priority of repeated transmission of the first message.

[0076] In one possible design, the second information is included in system message block 1.

[0077] In one possible design, the method is applied to a 4-step random access process.

[0078] In one possible design, the first message is Msg4.

[0079] In a fourth aspect, a communication method is provided, and the executor of the method may be a network device or a chip, a chip system or a circuit located in the network device. The method may be implemented through the following steps: sending DCI, the DCI being encrypted by TC-RNTI, and the DCI indicating configuration information for repeated transmission of the first message in the random access process, and the first message carrying conflict resolution information; and sending the first message according to the configuration information.

[0080] The present application adopts TC-RNTI encrypted DCI to configure repeated transmission of the first message, so that the terminal device can obtain the relevant configuration of repeated transmission of the first message before transmitting the first message, which is beneficial to improving the transmission performance of the first message, thereby improving the success rate of the random access process and reducing communication delay.

[0081] In one possible design, the DCI indicates configuration information for repeated transmission of the first message in the random access process, including: the MCS field in the DCI indicates the number of repeated transmissions of the first message. This method can save signaling overhead by reusing the MCS field to configure repeated transmission of the first message.

[0082] In one possible design, the MCS field in the DCI indicates the number of times the first message is repeatedly transmitted, including: part of the MSB of the MCS field indicates the number of times the first message is repeatedly transmitted.

[0083] In one possible design, the DCI indicates configuration information for repeated transmission of the first message in the random access process, including: a downlink allocation index field in the DCI indicates the number of times the first message is repeatedly transmitted. This method can save signaling overhead by reusing the downlink allocation index field to configure repeated transmission of the first message.

[0084] In one possible design, the downlink allocation index field in the DCI is used to indicate repeated transmission or non-repeated transmission of the first message, and the MCS field in the DCI is used to indicate the number of repeated transmissions of the first message when the downlink allocation index field indicates repeated transmission of the first message. This method can save signaling overhead by multiplexing the MCS field and the downlink allocation index field to configure repeated transmission of the first message.

[0085] In one possible design, the downlink allocation index field in the DCI is used to indicate repeated transmission or non-repeated transmission of the first message, including: 1 bit in the downlink allocation index field is used to indicate repeated transmission or non-repeated transmission of the first message.

[0086] In one possible design, the MCS field is used to indicate the number of repeated transmissions of the first message when the downlink allocation index field indicates repeated transmission of the first message, including: part of the MSB of the MCS field is used to indicate the number of repeated transmissions of the first message when the downlink allocation index field indicates repeated transmission of the first message.

[0087] In one possible design, the MCS field in the DCI is used to indicate repeated transmission or non-repeated transmission of the first message, and the downlink allocation index field in the DCI is used to indicate the number of repeated transmissions of the first message when the MCS field indicates repeated transmission of the first message. This method can save signaling overhead by multiplexing the MCS field and the downlink allocation index field to configure repeated transmission of the first message.

[0088] In one possible design, the MCS field is used to indicate repeated transmission or non-repeated transmission of the first message, including: the highest bit of the MCS field is used to indicate repeated transmission or non-repeated transmission of the first message.

[0089] In one possible design, the DCI format is format 1-0.

[0090] In one possible design, before receiving the first information, the method also includes: sending second information, where the second information is used to indicate the priority of repeated transmission of the first message.

[0091] In one possible design, the second information is included in system message block 1.

[0092] In one possible design, the method is applied to a 4-step random access process.

[0093] In one possible design, the first message is Msg4.

[0094] In a fifth aspect, a communication method is provided, wherein the executor of the method may be a terminal device or a chip, a chip system or a circuit located in the terminal device, and the method may be implemented through the following steps: receiving a RAR UL grant, wherein the RARUL grant indicates configuration information for repeated transmission of a first message in a random access process, wherein the first message carries conflict resolution information; and receiving the first message according to the configuration information.

[0095] The present application configures repeated transmission of the first message through RAR UL grant, so that the terminal device can obtain the relevant configuration of repeated transmission of the first message before transmitting the first message, which is beneficial to improving the transmission performance of the first message, thereby improving the success rate of the random access process and reducing communication delay.

[0096] In one possible design, the RAR UL grant indicates configuration information for repeated transmission of the first message in the random access process, including: the time domain resource allocation field in the RAR UL grant indicates configuration information for repeated transmission of the first message. This method can save signaling overhead by multiplexing the time domain resource allocation field to configure repeated transmission of the first message.

[0097] In one possible design, the N states of the time domain resource allocation field correspond one-to-one to N repeated transmission times, where N is an integer greater than 0.

[0098] In one possible design, the RAR UL grant indicates configuration information for repeated transmission of the first message in the random access process, including: the frequency domain resource allocation field and the frequency hopping field in the RAR UL grant indicate configuration information for repeated transmission of the first message. This method can save signaling overhead by multiplexing the frequency domain resource allocation field and the frequency hopping field to configure repeated transmission of the first message.

[0099] In one possible design, the frequency domain resource allocation field and the frequency hopping field indicate configuration information for repeated transmission of the first message, including: P bits indicating the number of times the first message is repeatedly transmitted, the P bits including at least one bit in the frequency domain resource allocation field and at least one bit in the frequency hopping field, and P is an integer greater than 1.

[0100] In one possible design, before sending the first information, the method also includes: receiving second information, where the second information is used to indicate the priority of repeated transmission of the first message.

[0101] In one possible design, the second information is included in system message block 1.

[0102] In one possible design, the method is applied to a 4-step random access process.

[0103] In one possible design, the first message is Msg4.

[0104] In a sixth aspect, a communication method is provided, wherein the executor of the method may be a network device or a chip, a chip system or a circuit located in the network device, and the method may be implemented through the following steps: sending a random access response uplink grant (RAR UL grant), wherein the RAR UL grant indicates configuration information for repeated transmission of a first message in a random access process, wherein the first message carries conflict resolution information; and sending the first message according to the configuration information.

[0105] The present application configures repeated transmission of the first message through RAR UL grant, so that the terminal device can obtain the relevant configuration of repeated transmission of the first message before transmitting the first message, which is beneficial to improving the transmission performance of the first message, thereby improving the success rate of the random access process and reducing communication delay.

[0106] In one possible design, the RAR UL grant indicates configuration information for repeated transmission of the first message in the random access process, including: the time domain resource allocation field in the RAR UL grant indicates configuration information for repeated transmission of the first message. This method can save signaling overhead by multiplexing the time domain resource allocation field to configure repeated transmission of the first message.

[0107] In one possible design, the N states of the time domain resource allocation field correspond one-to-one to N repeated transmission times, where N is an integer greater than 0.

[0108] In one possible design, the RAR UL grant indicates configuration information for repeated transmission of the first message in the random access process, including: the frequency domain resource allocation field and the frequency hopping field in the RAR UL grant indicate configuration information for repeated transmission of the first message. This method can save signaling overhead by multiplexing the frequency domain resource allocation field and the frequency hopping field to configure repeated transmission of the first message.

[0109] In one possible design, the frequency domain resource allocation field and the frequency hopping field indicate configuration information for repeated transmission of the first message, including: P bits indicating the number of times the first message is repeatedly transmitted, the P bits including at least one bit in the frequency domain resource allocation field and at least one bit in the frequency hopping field, and P is an integer greater than 1.

[0110] In one possible design, before receiving the first information, the method also includes: sending second information, where the second information is used to indicate the priority of repeated transmission of the first message.

[0111] In one possible design, the second information is included in system message block 1.

[0112] In one possible design, the method is applied to a 4-step random access process.

[0113] In one possible design, the first message is Msg4.

[0114] In a seventh aspect, the present application further provides a communication device, which is a terminal device or a chip in a terminal device. The communication device has the function of implementing any method provided in the first aspect, the third aspect, or the fifth aspect. The communication device can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions.

[0115] In one possible design, the communication device includes: a processor, which is configured to support the communication device to perform the corresponding functions of the terminal device in the method shown above. The communication device may also include a memory, which can be coupled to the processor and stores the necessary program instructions and data of the communication device. Optionally, the communication device also includes an interface circuit, which is used to support communication between the communication device and equipment such as a service satellite, such as the transmission and reception of data or signals. Exemplarily, the communication interface can be a transceiver, circuit, bus, module or other type of communication interface.

[0116] In one possible design, the communication device includes corresponding functional modules, which are respectively used to implement the steps in the above method. The functions can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

[0117] In one possible design, the structure of the communication device includes a processing unit (or processing unit) and a communication unit (or communication unit), which can perform the corresponding functions in the above method examples. For details, please refer to the description of the method provided in the first aspect, the third aspect or the fifth aspect, which will not be repeated here.

[0118] In an eighth aspect, the present application further provides a communication device, which is a network device or a chip in a network device. The communication device has the function of implementing any method provided in the second aspect, the fourth aspect, or the sixth aspect. The communication device can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions.

[0119] In one possible design, the communication device includes: a processor, which is configured to support the communication device to perform the corresponding functions of serving the satellite in the method shown above. The communication device may also include a memory, which can be coupled to the processor and stores the necessary program instructions and data of the communication device. Optionally, the communication device also includes an interface circuit, which is used to support communication between the communication device and a terminal device or other device, such as the transmission and reception of data or signals. Exemplarily, the communication interface can be a transceiver, circuit, bus, module or other type of communication interface.

[0120] In one possible design, the communication device includes corresponding functional modules, which are respectively used to implement the steps in the above method. The functions can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

[0121] In one possible design, the structure of the communication device includes a processing unit (or processing unit) and a communication unit (or communication unit), which can perform the corresponding functions in the above method examples. For details, please refer to the description of the method provided in the second aspect, the fourth aspect or the sixth aspect, which will not be repeated here.

[0122] In the ninth aspect, a communication device is provided, comprising a processor and an interface circuit, the interface circuit being used to receive signals from other communication devices outside the communication device and transmit them to the processor or to send signals from the processor to other communication devices outside the communication device, the processor being used to implement the methods in the aforementioned first aspect, third aspect, fifth aspect and any possible design through logic circuits or execution code instructions.

[0123] In the tenth aspect, a communication device is provided, comprising a processor and an interface circuit, the interface circuit being used to receive signals from other communication devices outside the communication device and transmit them to the processor or to send signals from the processor to other communication devices outside the communication device, the processor being used to implement the methods in the aforementioned second aspect, fourth aspect, sixth aspect and any possible design through logic circuits or execution code instructions.

[0124] In the eleventh aspect, a computer-readable storage medium is provided, in which a computer program or instruction is stored. When the computer program or instruction is executed by a processor, the method of any one of the first to sixth aspects and any possible design is implemented.

[0125] In the twelfth aspect, a computer program product storing instructions is provided, which, when executed by a processor, implements the method in any one of the first to sixth aspects and any possible design.

[0126] In a thirteenth aspect, a chip system is provided, the chip system includes a processor and may also include a memory, for implementing the method in any aspect of the first to sixth aspects and any possible design. The chip system may be composed of a chip, or may include a chip and other discrete devices.

[0127] In a fourteenth aspect, a communication system is provided, the system comprising the apparatus described in the first aspect (such as a terminal device) and the apparatus described in the second aspect (such as a network device).

[0128] In a fifteenth aspect, a communication system is provided, the system comprising the apparatus described in the third aspect (such as a terminal device) and the apparatus described in the fourth aspect (such as a network device).

[0129] In the sixteenth aspect, a communication system is provided, the system comprising the apparatus described in the fifth aspect (such as a terminal device) and the apparatus described in the sixth aspect (such as a network device).

[0130] The technical effects that can be achieved by the technical solutions of any of the seventh to sixteenth aspects mentioned above can be described with reference to the technical effects that can be achieved by the technical solutions of the first to sixth aspects mentioned above, and the repeated parts will not be repeated. BRIEF DESCRIPTION OF THE DRAWINGS

[0131] Figure 1 A schematic diagram of a 4-step random access process according to an embodiment of the present application;

[0132] Figure 2 A schematic diagram of a two-step random access process according to an embodiment of the present application;

[0133] Figure 3 A schematic diagram of expanding coverage according to an embodiment of the present application;

[0134] Figure 4 A schematic diagram of the architecture of a communication system according to an embodiment of the present application;

[0135] Figure 5 A schematic diagram of a connection between a terminal device and a network device according to an embodiment of the present application;

[0136] Figure 6 A flow chart of a communication method according to an embodiment of the present application;

[0137] Figure 7 A flow chart of a communication method according to an embodiment of the present application;

[0138] Figure 8 A flow chart of a communication method according to an embodiment of the present application;

[0139] Fig. 9A schematic diagram of the structure of a communication device according to an embodiment of the present application;

[0140] Fig.10 A schematic diagram of the structure of a communication device according to an embodiment of the present application. DETAILED DESCRIPTION

[0141] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0142] Below, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

[0143] 1) Terminal equipment, which can be a device with wireless transceiver function or a chip that can be set in any device, can also be called user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communication equipment, user agent or user device. The terminal equipment in the embodiment of the present application can be a mobile phone, a tablet computer (Pad), a computer with wireless transceiver function, an XR device (such as VR device, AR device, MR device, etc.), a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in video surveillance, and a wearable terminal device. The terminal equipment can also be an eMBB UE, a URLLC UE, a drone, other Internet of Things (IoT) devices, a positioning device, etc.

[0144] The network device may be a device for realizing the functions of the access network device. The access network device may refer to a device in the access network that communicates with the wireless terminal device through one or more cells at the air interface, for example, it may be a next generation base station (next Generation node B, gNB) in the NR system, or an evolutionary base station (evolutional node B, eNB) in the long term evolution (long term evolution, LTE) system. The network device may also be a device that can support the network device to realize the functions of the access network device, such as a chip system, which may be installed in the network device.

[0145] 2) Reduced capability (REDCAP) terminal equipment (REDCAP UE)

[0146] REDCAP UE can be understood as a terminal device with reduced capabilities compared to a legacy UE. The difference between a legacy UE and a REDCAP UE includes at least one of the following:

[0147] 1. Different bandwidth capabilities. The maximum bandwidth supported by legacy UEs can be greater than the maximum bandwidth supported by REDCAP UEs. For example, legacy UEs can support communication with network devices using 100MHz frequency domain resources on a single carrier at most, while REDCAP UEs can support communication with network devices using 20MHz, 10MHz, or 5MHz frequency domain resources on a single carrier at most.

[0148] 2. The number of transmitting and receiving antennas is different. The antenna configuration of legacy UE can be greater than that of REDCAP UE. For example, the minimum antenna configuration supported by legacy UE can be greater than the maximum antenna configuration supported by REDCAP UE. For example, the minimum antenna configuration supported by legacy UE can be 4 transmit and 2 receive, that is, under the minimum antenna configuration, 4 receive antennas are used to receive downlink signals, and 2 transmit antennas are used to send uplink signals; while the maximum antenna configuration supported by REDCAP UE can be less than 4 transmit and 2 receive, for example, REDCAP UE only supports 2 receive and 1 transmit, or it can also support 2 receive and 2 transmit.

[0149] 3. Different uplink maximum transmit power. The uplink maximum transmit power of legacy UE can be greater than that of REDCAP UE. For example, the uplink maximum transmit power of legacy UE can be 23dBm or 26dBm, while the uplink maximum transmit power of REDCAP UE can only be a value between 4dBm and 20dBm.

[0150] 4. The protocol versions corresponding to legacy UE and REDCAP UE are different. For example, NR Rel-15 and NR Rel-16 terminal devices can be considered as legacy UE, and REDCAP UE can be considered as NR Rel-17 terminal devices.

[0151] 5. The carrier aggregation (CA) capabilities supported by legacy UE and REDCAP UE are different. For example, legacy UE can support carrier aggregation, while REDCAP UE does not support carrier aggregation; for another example, both REDCAP UE and legacy UE support carrier aggregation, but the maximum number of carrier aggregations supported by legacy UE at the same time is greater than the maximum number of carrier aggregations supported by REDCAP UE at the same time, for example, legacy UE can support aggregation of up to 5 carriers or 32 carriers at the same time, while REDCAP UE can support aggregation of up to 2 carriers at the same time.

[0152] 6. The frequency division duplex (FDD) capabilities of legacy UE and REDCAP UE are different. For example, legacy UE can support full-duplex FDD, while REDCAP UE can only support half-duplex FDD.

[0153] 7. REDCAP UE and legacy UE have different data processing time capabilities. For example, the minimum delay between a legacy UE receiving downlink data and sending feedback on the downlink data is smaller than the minimum delay between a REDCAP UE receiving downlink data and sending feedback on the downlink data, and / or the minimum delay between a legacy UE sending uplink data and receiving feedback on the uplink data is smaller than the minimum delay between a REDCAP UE sending uplink data and receiving feedback on the uplink data.

[0154] 8. The processing capabilities of legacy UE and REDCAP UE are different.

[0155] 9. The uplink and / or downlink transmission peak rates of legacy UE and REDCAP UE are different.

[0156] 10.REDCAP UE supports the downlink bandwidth part (BWP) configured by UE-specific radio resource control (RRC) and including cell defining SSB (CD-SSB) or non cell defining SSB (NCD-SSB). Legacy UE only supports the downlink BWP including CD-SSB configured by UE-specific RRC.

[0157] 11.REDCAP UE supports NCD-SSB based measurements in the downlink BWP configured by RRC.

[0158] 3) Enhanced reduced capability (eREDCAP) terminal equipment (EREDCAP UE)

[0159] EREDCAP UE can be understood as a terminal device with further reduced capabilities compared to REDCAP UE. EREDCAP UE uses most of the configurations of REDCAP UE, and further enhancements include at least one of the following:

[0160] 1. The uplink and downlink peak rates are 10Mbps, and for UEs of feature group FG 48-1, the corresponding peak rate is v*Q*f=3.2. Where v is the number of multiple-input multiple-output (MIMO) layers, Q is the modulation order, and f is the scaling factor. For UEs of feature group FG 48-2, when the number of layers is 1, the corresponding peak rate is v*Q*f=0.8; when the number of layers is 2, the corresponding peak rate is v*Q*f=0.75.

[0161] 2. For UEs of FG 48-1, the maximum number of uplink or downlink unicast scheduling physical resource blocks (PRBs) supported by a single slot or a single hop is 25 PRBs at 15 kHz or 12 PRBs at 30 kHz.

[0162] 3. When the number of resource blocks (RBs) scheduled by the random access response (RAR) physical downlink shared channel (PDSCH) or message B (MsgB) PDSCH exceeds 25 PRBs at 15kHz or 12 PRBs at 30kHz, the RAR processing timing is relaxed by 1 / 0.5ms corresponding to 15 / 30kHz subcarrier spacing (SCS), respectively.

[0163] 4) The random access process includes a contention-based random access (CBRA) process and a contention-free random access (CFRA) process. The CBRA process is described below.

[0164] The CBRA process can be completed through a 4-step random access channel (RACH) or a 2-step RACH.

[0165] refer to Figure 1 , the 4-step RACH process includes:

[0166] S11, the terminal device sends a random access request message to the network device, and the network device receives the random access request message from the terminal device. The random access request message may also be called a first message (Msg1), which includes a random access preamble.

[0167] S12: The network device sends a RAR message to the terminal device, and the terminal device receives the RAR message from the network device. The RAR message may also be referred to as a second message (Msg2).

[0168] S13, the terminal device sends scheduled transmission information to the network device, and the network device receives the scheduled transmission information from the terminal device. The message carrying the scheduled transmission information is called the third message (Msg3).

[0169] After receiving the RAR message, the terminal device transmits the message based on the scheduling of the RAR message. Specifically, the terminal device may send Msg3 via a physical uplink shared channel (PUSCH) scheduled by the RAR UL grant carried in the first RAR.

[0170] S14, the network device sends contention resolution information to the terminal device, and the message carrying the contention resolution information is called the fourth message (Mg4). The terminal device receives Msg4 from the network device and can obtain the contention resolution information.

[0171] The above is the 4-step RACH, and the following is the 2-step RACH. Figure 2 , 2-step RACH includes:

[0172] S21. The terminal device sends message A (MsgA) to the network device, and the network device receives MsgA from the terminal device.

[0173] The terminal device selects a Msg A resource from the public Msg A resources broadcast by the network device and sends Msg A through the Msg A resource. The Msg A resource includes resources (time-frequency codes) for sending preamble and corresponding PUSCH resources. Msg A also includes two parts, one is preamble and the other is PUSCH payload.

[0174] The MsgA message can be considered to include the content included in the preamble and Msg3 in the 4-step RACH.

[0175] S22. The network device sends MsgB to the terminal device, and the terminal device receives MsgB from the network device.

[0176] MsgB may include contention resolution information and the content included in the RAR message in the 4-step RACH.

[0177] The terms "system" and "network" in the embodiments of the present application can be used interchangeably. In the embodiments of the present application, "at least one" refers to one or more, and "plurality" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0178] Furthermore, unless otherwise specified, ordinal numbers such as "first" and "second" mentioned in the embodiments of the present application are used to distinguish multiple objects, and are not used to limit the size, content, sequence, timing, priority or importance of multiple objects. For example, the first message and the second message are only used to distinguish different messages, and do not indicate the difference in the sending order, content, priority or importance of the two messages.

[0179] The foregoing introduces some terminology concepts involved in the embodiments of the present application. The following introduces the technical features involved in the embodiments of the present application.

[0180] In order to further improve the application scope of terminal devices with reduced capabilities (such as REDCAP UE, EREDCAP UE, or other terminal devices with reduced capabilities that will appear in the future) or adopt a lower network density, the coverage range can be expanded by further reducing the edge rate of the terminal device. For example, the network device can configure different cell access parameters for the terminal devices with reduced capabilities and the legacy UE, so that the coverage range of different terminal devices is different. For example, Figure 3 As shown, assuming that the rate of the legacy UE is 1 Mbps and the rate of the terminal device with reduced capabilities is 200 kbps, the coverage of the terminal device with reduced capabilities is larger.

[0181] In order to improve the coverage of terminal devices with reduced capabilities, it is necessary to determine which channels have coverage shortcomings for terminal devices with reduced capabilities. According to the coverage evaluation results, it can be seen that in the scenario of urban carrier frequency 4GHz, the three channels with the largest coverage loss for terminal devices with reduced capabilities are: Msg2>PUSCH>Msg4. Among them, the existing protocol already supports coverage enhancement of Msg2 and PUSCH channels. The PUSCH channel can support multiple repetitions through the TDRA configuration of DCI to achieve coverage enhancement. The Msg2 channel can achieve transmission block scaling through the TB scaling field to improve coverage. However, other messages such as Msg4 currently have no definition of how to perform coverage enhancement in the protocol, resulting in poor communication performance of terminal devices with reduced capabilities. Taking Msg4 as an example, due to the large loss of Msg4 channel, the terminal device may be unable to access the network device, especially for EREDCAP UE, due to the further reduction of capabilities, the loss of Msg4 channel is greater, and the probability of successful random access is lower.

[0182] Based on this, the embodiment of the present application provides a communication method and device for enhancing the coverage of messages such as Msg4. The method and the device are based on the same inventive concept. Since the method and the device solve the problem in a similar way, the implementation of the device and the method can refer to each other, and the repeated parts will not be repeated.

[0183] The communication method provided in this application can be applied to various communication systems, for example, it can be the Internet of Things (IoT), narrowband Internet of Things (NB-IoT), long term evolution (LTE), it can also be a fifth generation (5G) communication system, it can also be a hybrid architecture of LTE and 5G, it can also be a 5G new radio (NR) system, and 6G or new communication systems that will appear in the future communication development. The 5G communication system described in this application may include at least one of a non-standalone (NSA) 5G communication system and a standalone (SA) 5G communication system. The communication system can also be a machine to machine (M2M) network or other network.

[0184] The network device and the terminal device can communicate through the licensed spectrum, or through the unlicensed spectrum, or through both the licensed spectrum and the unlicensed spectrum. The network device and the terminal device can communicate through the spectrum below 6G, or through the spectrum above 6G, or through both the spectrum below 6G and the spectrum above 6G. The embodiment of the present application does not limit the spectrum resources used between the network device and the terminal device.

[0185] See also Figure 4 As shown, a communication system provided by an embodiment of the present application includes a network device and six terminal devices, namely UE1 to UE6. In the communication system, UE1 to UE6 can send uplink data to the network device, and the network device can receive uplink data sent by UE1 to UE6. In addition, UE4 to UE6 can also form a sub-communication system. The network device can send downlink information to UE1, UE2, UE3, and UE5, and UE5 can send downlink information to UE4 and UE6 based on device-to-device (D2D) technology. Figure 4 It is only a schematic diagram and does not specifically limit the type of communication system, or the number and type of devices included in the communication system.

[0186] Exemplarily, the network device and the terminal device may be connected via an air interface. For example, the connection relationship between the network device and the terminal device may be as follows: Figure 5 shown.

[0187] The embodiments of the present application can be applied to a communication system of a terminal device with reduced service capabilities, and of course can also be applied to a communication system of a terminal device with reduced service capabilities and a legacy UE.

[0188] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. A person of ordinary skill in the art can appreciate that with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0189] The technical solution in the embodiment of the present application will be described below in conjunction with the accompanying drawings in the embodiment of the present application. For ease of introduction, the method is performed by a network device and a terminal device as an example.

[0190] See also Figure 6 , is a flow chart of a communication method provided by the present application. The method comprises:

[0191] S601, a terminal device sends first information, and correspondingly, a network device receives the first information.

[0192] The first information is used to request repeated transmission of the first message in the random access process, and the first information includes at least one of the following: a preamble or a logical channel identifier. The first message carries conflict resolution information. The first message may be Msg4 in a 4-step random access process, or the first message may be MsgB in a 2-step random access process. The following also relates to a second message in the random access process, and the second message is carried through a physical uplink shared channel. The second message may be Msg3 in a 4-step random access process, or the first message may be MsgA in a 2-step random access process.

[0193] The specific manner of repeatedly transmitting the first information request Msg4 will be described in detail below.

[0194] S602: The network device sends a first message in a repeated transmission manner. Correspondingly, the terminal device receives the first message.

[0195] The present application requests the network device to transmit Msg4 repeatedly through preamble or logical channel identifier, thereby achieving coverage enhancement of Msg4, improving the success rate of random access, reducing communication delay, and improving the coverage range of terminal devices.

[0196] To facilitate understanding of the solution, the following description is given by taking the case where the first message is Msg4 and the second message is Msg3 as an example.

[0197] Three examples of repeated transmission of the first information request Msg4 are introduced below.

[0198] Example 1: A specific preamble may be used to request repeated transmission of Msg4. For example, the first information includes a first preamble, and the first preamble is used to request repeated transmission of Msg4. Specifically, the first preamble is predefined or pre-agreed to indicate a request for repeated transmission of the first message (e.g., Msg4). When the network device receives the first preamble, it can be determined that the terminal device requests to send Msg4 in a repeated transmission manner, and no additional indication information is needed.

[0199] There are two possible implementations based on the above examples.

[0200] One implementation is to request repeated transmission of Msg4 and repeated transmission of Msg3 respectively through different preambles. For example, the preamble set in which the first preamble is located may also include a second preamble, and the second preamble is used to request repeated transmission of Msg3.

[0201] Optionally, there may be multiple first preambles, that is, there may be multiple specific preambles for requesting repeated transmission of Msg4. If the terminal device sends any of the preambles, the network device may schedule repeated transmission of Msg4. By sending Msg4 in a repeated transmission manner through multiple specific preamble requests, different terminal devices may select different preambles for random access, thereby reducing the probability of terminal device collision.

[0202] There may be multiple second preambles, that is, there may be multiple specific preambles for requesting repeated transmission of Msg3. If the terminal device sends any of the preambles, the network device may schedule repeated transmission of Msg3.

[0203] In the example, it is assumed that the preamble set includes 64 preambles, K1 preambles in the preamble set are used to request repeated transmission of Msg3, and K2 preambles are used to request repeated transmission of Msg4. Among them, K1 preamble sequences and K2 preambles are two subsets of the preamble set. K1 is an integer greater than 0 and less than 64, and K2 is an integer greater than 0 and less than 64. If the network device detects any preamble among the K1 preambles, the network device can schedule repeated transmission of Msg3. If the network device detects any preamble among the K2 preambles, the network device can schedule repeated transmission of Msg4.

[0204] One implementation is to request repeated transmission of Msg4 and Msg3 through the same preamble. For example, the first preamble is used to request repeated transmission of Msg3 and Msg4.

[0205] Optionally, there may be multiple first preambles, that is, there may be multiple specific preambles for requesting repeated transmission of Msg3 and Msg4. If the terminal device sends any of the preambles, the network device may schedule repeated transmission of Msg3 and Msg4.

[0206] In the example, it is assumed that the preamble set includes 64 preambles, and K preambles in the preamble set are used to request repeated transmission of Msg3 and Msg4. Among them, the K preamble sequences are a subset of the preamble set. K is an integer greater than 0 and less than 64. If the network device detects any preamble in the K preambles, the network device can schedule repeated transmission of Msg3 and Msg4.

[0207] Example 2, it is possible to request repeated transmission of Msg4 through a specific random access resource. For example, the terminal device can carry the first information on a specific random access resource to request repeated transmission of Msg4. For example, the first information is carried on the first random access resource, and the first random access resource is used to request repeated transmission of Msg4. Specifically, the predefined or pre-agreed first random access resource is used to indicate a request for repeated transmission of the first message (such as Msg4). When the network device detects a preamble on the first random access resource, it can be determined that the terminal device requests to send Msg4 in a repeated transmission manner, and there is no need to introduce additional indication information.

[0208] Optionally, there may be multiple first random access resources, that is, there may be multiple specific random access resources for requesting repeated transmission of Msg4. If the network device detects a preamble on any of the random access resources, the network device may schedule repeated transmission of Msg4. By requesting to send Msg4 in a repeated transmission manner through multiple specific random access resources, different terminal devices can select different random access resources for random access, thereby reducing the probability of terminal device collision.

[0209] In the example, the random access resource pool may be divided, where L random access resources are used to request repeated transmission of Msg4, where L is an integer greater than 0. If the network device detects a preamble on any random access resource among the L random access resources, the network device may schedule repeated transmission of Msg4.

[0210] Example 3, Msg4 can be requested to be transmitted repeatedly through a specific logical channel identification (LCID). For example, the first information includes a first LCID, and the first LCID is used to request Msg4 to be transmitted repeatedly. Specifically, the predefined or pre-agreed first LCID is used to indicate a request for repeated transmission of the first message (e.g., Msg4). When the network device receives the first LCID, it can be determined that the terminal device requests to send Msg4 in a repeated transmission manner, and there is no need to introduce additional indication information.

[0211] Optionally, there may be multiple first LCIDs, that is, there may be multiple specific LCID values ​​for requesting repeated transmission of Msg4. By requesting to send Msg4 in a repeated transmission manner through multiple specific LCIDs, different types of terminal devices can use the corresponding LCID, which is conducive to improving communication performance.

[0212] Exemplarily, the value of the first LCID is 39, 40, 41, 42 or 47. In a possible example, the multiple specific LCID values ​​may include one or more of 39, 40, 41, 42 or 47, that is, the selectable value of the first LCID may include one or more of 39, 40, 41, 42 or 47.

[0213] For example, when the LCID value is 35 or 36, it indicates that the UE type of the terminal device is REDCAP UE. When the LCID value is 39 or 40, it indicates that the UE type of the terminal device is REDCAP UE and requests repeated transmission of Msg4. If the network device detects an LCID value of 35 or 36, it can be determined that the UE type of the terminal device is REDCAP UE, and there is no need to schedule repeated transmission of Msg4. If the network device detects an LCID value of 39 or 40, it can be determined that the UE type of the terminal device is REDCAPUE, and there is a need to schedule repeated transmission of Msg4.

[0214] When the LCID value is 37 or 38, it indicates that the UE type of the terminal device is eREDCAP UE. When the LCID value is 41 or 42, it indicates that the UE type of the terminal device is eREDCAP UE and requests repeated transmission of Msg4. If the network device detects an LCID with a value of 37 or 38, it can be determined that the UE type of the terminal device is eREDCAP UE, and there is no need to schedule repeated transmission of Msg4. If the network device detects an LCID with a value of 41 or 42, it can be determined that the UE type of the terminal device is eREDCAP UE, and there is a need to schedule repeated transmission of Msg4. As shown in Table 1.

[0215] Table 1

[0216]

[0217] Exemplarily, the value of the first LCID may also be 35, 36, 37 or 38. In a possible example, the multiple specific LCID values ​​may include one or more of 35, 36, 37 or 38, that is, the selectable value of the first LCID may include one or more of 35, 36, 37 or 38.

[0218] In the example, when the LCID value is 35 or 36, it indicates that the UE type of the terminal device is REDCAP UE and requests repeated transmission of Msg4. If the network device detects an LCID value of 35 or 36, it can be determined that the UE type of the terminal device is REDCAP UE and needs to schedule repeated transmission of Msg4.

[0219] When the LCID value is 37 or 38, it indicates that the UE type of the terminal device is eREDCAP UE and requests repeated transmission of Msg4. If the network device detects an LCID value of 37 or 38, it can be determined that the UE type of the terminal device is eREDCAP UE and needs to schedule repeated transmission of Msg4. As shown in Table 2.

[0220] Table 2

[0221] LCID value Instructions 35 CCCH of size 48bits for a RedCap UE, repetition 36 CCCH of size 64bits for a RedCap UE, repetition 37 CCCH of size 48bits for a eRedCap UE, repetition 38 CCCH of size 64bits for a eRedCap UE, repetition

[0222] It should be noted that the above three examples only use the preamble, the random access resource carrying the preamble and the LCID to request the repeated transmission of Msg4 separately as an example. In the specific implementation, it is also possible to make a joint request through any two of the preamble, the random access resource carrying the preamble and the LCID. For example, the repeated transmission of Msg4 is jointly requested through the preamble and the random access resource carrying the preamble. For example, if the network device detects a specific preamble on a specific random access resource, the repeated transmission of Msg4 can be scheduled. Alternatively, if the network device detects a preamble on a specific random access resource, and the LCID is a specific value, the repeated transmission of Msg4 can be scheduled. Alternatively, if the network device detects a specific preamble and the LCID is a specific value, the repeated transmission of Msg4 can be scheduled.

[0223] Alternatively, a joint request may be made through the preamble, the random access resource carrying the preamble, and the LCID. If the network device detects a specific preamble on a specific random access resource and the LCID is a specific value, Msg4 may be scheduled for repeated transmission.

[0224] The above method jointly requests repeated transmission of Msg4 through at least two specific resources, which can save signaling overhead compared to the method of requesting repeated transmission of Msg4 through signaling messages.

[0225] The above describes the manner in which the terminal device requests the network device to retransmit Msg4. Optionally, before requesting the network device to retransmit Msg4, the terminal device may determine whether to retransmit Msg4.

[0226] One possible implementation is: when the reference signal received power (RSRP) of the downlink reference signal is less than the RSRP threshold value, the terminal device initiates a Msg4 retransmission request. The downlink reference signal may be a synchronization signal / physical broadcast channel block (SSB) with measurement function.

[0227] Optionally, the present application may support repeated transmission of Msg4 on the main carrier and the auxiliary carrier. In this embodiment, the main carrier and the auxiliary carrier may correspond to different RSRP threshold values. When the RSRP of the downlink reference signal on the main carrier is less than the RSRP threshold value corresponding to the main carrier, the terminal device may request repeated transmission of Msg4 on the main carrier; when the RSRP of the downlink reference signal on the auxiliary carrier is less than the RSRP threshold value corresponding to the auxiliary carrier, the terminal device may request repeated transmission of Msg4 on the auxiliary carrier. Among them, the RSRP threshold value corresponding to the main carrier and the RSRP threshold value corresponding to the auxiliary carrier may be the same or different, and no specific limitation is made here.

[0228] In the present application, the terminal device may also determine the priority of obtaining the repeated transmission of Msg4 before requesting the repetition of Msg4. For example, before the above S601, the network device may send a second message to the terminal device, and the second message is used to indicate the priority of the repeated transmission of Msg4. Exemplarily, the second message may be included in system information block 1 (SIB1).

[0229] In one possible implementation, the network device may configure multiple groups of random access resources for the terminal device, wherein the multiple groups of random access resources may correspond to multiple features, for example, random access resource A corresponds to REDCAP UE, that is, REDCAP UE can perform random access through random access resource A; random access resource B corresponds to network slicing, that is, terminal devices supporting network slicing can perform random access through random access resource B; random access resource C corresponds to small packet transmission, and terminal devices requiring small packet transmission can perform random access through random access resource C; random access resource D corresponds to Msg3 coverage enhancement, and terminal devices requiring Msg3 coverage enhancement can perform random access through random access resource D; random access resource E corresponds to Msg4 coverage enhancement, and terminal devices requiring Msg4 coverage enhancement can perform random access through random access resource E; and so on. When the terminal device is configured with multiple groups of random access resources, the configured random access resource set and the features applicable to the current random access process are used as inputs, and specifically, the random access resource corresponding to the feature with the highest priority can be applied to the current random access process.

[0230] It should be noted that Figure 6 The method is described by taking the first information requesting Msg4 to be repeatedly transmitted as an example. In a specific implementation, Msg4 may also be requested not to be repeatedly transmitted. Specifically, Msg4 may be requested not to be repeatedly transmitted in a manner similar to the above examples 1 to 3, for example, by requesting Msg4 not to be repeatedly transmitted through a specific preamble, by requesting Msg4 not to be repeatedly transmitted through a specific random access resource, by requesting Msg4 not to be repeatedly transmitted through a specific LCID, etc. For details, please refer to the relevant description above, which will not be described in detail here.

[0231] It can be understood that Msg4 non-repeated transmission and Msg4 repeated transmission can be requested through different information. For example, through a specific preamble request, the preamble used to request Msg4 non-repeated transmission is different from the preamble used to request Msg4 repeated transmission. By isolating the resources for requesting Msg4 repeated transmission and requesting Msg4 non-repeated transmission, the accuracy of the request can be improved, which is conducive to improving communication performance.

[0232] Taking the example of requesting through a specific random access resource, the random access resource used to request non-repeated transmission of Msg4 is different from the random access resource used to request repeated transmission of Msg4. Taking the example of requesting through a specific LCID, the LCID used to request non-repeated transmission of Msg4 is different from the LCID used to request repeated transmission of Msg4.

[0233] Alternatively, a specific preamble may be used to request repeated transmission of Msg4, and a specific random access resource may be used to request non-repeated transmission of Msg4. For example, predefined preamble A is used to request repeated transmission of Msg3 and Msg4, and random access resource A is used to request non-repeated transmission of Msg4. If the network device detects preamble A on random access resource A, the network device may schedule repeated transmission of Msg3 without scheduling repeated transmission of Msg4.

[0234] Similarly, you can request repeated transmission of Msg4 through a specific preamble, and request non-repeated transmission of Msg4 through a specific LCID. Alternatively, you can request repeated transmission of Msg4 through a specific random access resource, and request non-repeated transmission of Msg4 through a specific LCID. Alternatively, you can request repeated transmission of Msg4 through a specific random access resource, and request non-repeated transmission of Msg4 through a specific preamble. Alternatively, you can request repeated transmission of Msg4 through a specific LCID, and request non-repeated transmission of Msg4 through a specific preamble. Alternatively, you can request repeated transmission of Msg4 through a specific LCID, and request non-repeated transmission of Msg4 through a specific random access resource. And so on.

[0235] This application requests the network device to retransmit Msg4 through preamble or logical channel identifier, so as to achieve Msg4 coverage enhancement, improve the success rate of random access, reduce communication delay, and improve the coverage of terminal equipment. In addition, by requesting Msg4 retransmission through preamble, random access resources carrying preamble, logical channel identifier, etc., signaling overhead can be saved.

[0236] The above describes the way that the terminal device requests the network device to retransmit Msg4. Before the network device retransmits Msg4, it can configure the terminal device to retransmit Msg4. The following describes two ways that the network device configures the retransmission of Msg4.

[0237] It should be noted that the method of requesting repeated transmission of Msg4 and any method of configuring repeated transmission of Msg4 can be implemented as a single solution or combined as a solution. Figure 6 The method and Figure 7 The method is combined as an implementation scheme, and S701 can be executed after executing the above S601, and S602 can be executed after executing S701, wherein when executing S602, the configuration information in S701 can be used to send the first message (that is, S702). Figure 6 The method and Figure 8The method is combined as an implementation scheme, and S801 may be executed after executing the above S601, and S602 may be executed after executing S801, wherein when executing S602, the configuration information in S801 may be used to send the first message (ie, S802).

[0238] Method 1 for configuring repeated transmission of Msg4:

[0239] like Figure 7 The figure is a flow chart of a communication method provided by the present application. The method includes:

[0240] S701: The network device sends DCI, and the terminal device receives the DCI accordingly.

[0241] The DCI is encrypted by a temporary cell-radio network temporary identifier (TC-RNTI), and the DCI indicates configuration information for repeated transmission of the first message in the random access process, and the first message carries conflict resolution information. Optionally, the format of the DCI can be format 1-0.

[0242] The first message may be Msg4 in a 4-step random access process, and may also be called a message scheduled by DCI format 1-0 using TC-RNTI scrambling, or the first message may be MsgB in a 2-step random access process.

[0243] The specific manner in which the DCI indicates the configuration information for repeated transmission of Msg4 will be described in detail below.

[0244] S702, the network device sends a first message according to the configuration information. Correspondingly, the terminal device receives the first message according to the configuration information.

[0245] The present application adopts TC-RNTI encrypted DCI to configure Msg4 repeated transmission, so that the terminal device can obtain the relevant configuration of Msg4 repeated transmission before transmitting Msg4, which is beneficial to improving the transmission performance of Msg4, thereby improving the success rate of the random access process and reducing communication delay.

[0246] To facilitate understanding of the solution, the following description is given by taking the first message Msg4 as an example.

[0247] Four examples of configuration information indicating repeated transmission of DCI Msg4 are described below.

[0248] Example A1, the modulation and coding scheme (MCS) field in the DCI indicates the number of times Msg4 is repeatedly transmitted.

[0249] Exemplarily, the number of repetitions of Msg4 may be indicated by 2 bits of information of the most significant bit (MSB) of the MCS field.

[0250] For example, as shown in Table 3, when the 2 bits of the MCS field (for example, the 2 bits of the MSB) take the value of 00, it can indicate that the number of repetitions K is 1, that is, no repetition; when the 2 bits of the MCS field take the value of 01, it can indicate that the number of repetitions K is 2; when the 2 bits of the MCS field take the value of 10, it can indicate that the number of repetitions K is 3; when the 2 bits of the MCS field take the value of 11, it can indicate that the number of repetitions K is 4.

[0251] Table 3

[0252] 2 bits of MCS Repetitions 00 1 01 2 10 3 11 4

[0253] It should be understood that Table 3 is only an exemplary description, and the present application does not limit the number of repetitions indicated by the MCS, nor does it limit the corresponding relationship between the value of the MCS field and the number of repetitions.

[0254] Example A2: The downlink allocation index field in the DCI indicates the number of times Msg4 is repeatedly transmitted.

[0255] Exemplarily, the number of repetitions of Msg4 can be indicated by 2 bits of information in the downlink allocation index field.

[0256] For example, as shown in Table 4, when the 2-bit value of the downlink allocation index field is 00, it can indicate that the number of repetitions K is 1, that is, no repetition; when the 2-bit value of the downlink allocation index field is 01, it can indicate that the number of repetitions K is 2; when the 2-bit value of the downlink allocation index field is 10, it can indicate that the number of repetitions K is 3; when the 2-bit value of the downlink allocation index field is 11, it can indicate that the number of repetitions K is 4.

[0257] Table 4

[0258] 2 bits of the downlink allocation index field Repetitions 00 1 01 2 10 3 11 4

[0259] It should be understood that Table 4 is only an exemplary description, and the present application does not limit the number of repetitions indicated by the downlink allocation index field, nor does it limit the corresponding relationship between the value of the downlink allocation index field and the number of repetitions.

[0260] Example A3, the downlink allocation index field in the DCI is used to indicate repeated transmission or non-repeated transmission of Msg4, and the MCS field in the DCI is used to indicate the number of repeated transmissions of Msg4 when the downlink allocation index field indicates repeated transmission of Msg4.

[0261] Exemplarily, 1 bit in the downlink allocation index field may indicate whether Msg4 is repeatedly transmitted. When the downlink allocation index field indicates that Msg4 is repeatedly transmitted, 2 bits in the MCS field (eg, 2 bits of the MSB) indicate the number of times Msg4 is repeatedly transmitted.

[0262] For example, when the value of 1 bit in the downlink allocation index field is 0, it indicates that Msg4 is not repeatedly transmitted; when the value of 1 bit in the downlink allocation index field is 1, it indicates that Msg4 is repeatedly transmitted. When the downlink allocation index field indicates that Msg4 is repeatedly transmitted, the number of times the MCS field indicates that Msg4 is repeatedly transmitted can refer to the relevant description of Example A1, which will not be repeated here.

[0263] Example A4, the MCS field in the DCI is used to indicate repeated transmission or non-repeated transmission of Msg4, and the downlink allocation index field in the DCI is used to indicate the number of repeated transmissions of Msg4 when the MCS field indicates repeated transmission of Msg4.

[0264] Exemplarily, the MSB 1 bit in the MCS field may indicate whether Msg4 is repeatedly transmitted. In the case where the MSB 1 bit in the MCS field indicates that Msg4 is repeatedly transmitted, the 2 bits in the downlink allocation index field indicate the number of times Msg4 is repeatedly transmitted.

[0265] For example, when the MSB bit in the MCS field takes a value of 0, it indicates that Msg4 is not repeatedly transmitted; when the MSB bit in the MCS field takes a value of 1, it indicates that Msg4 is repeatedly transmitted. When the MSB bit in the MCS field indicates that Msg4 is repeatedly transmitted, the number of times the downlink allocation index field indicates that Msg4 is repeatedly transmitted can refer to the relevant description of Example A2, which will not be repeated here.

[0266] In the present application, the terminal device may also determine the priority of obtaining the repeated transmission of Msg4 before configuring the repeated transmission of Msg4. For example, before the above S701, the network device may send the second information to the terminal device, and the second information is used to indicate the priority of the repeated transmission of Msg4. Exemplarily, the second information may be included in SIB1. For a specific implementation, please refer to Figure 6 The relevant descriptions of the method will not be repeated here.

[0267] This application uses TC-RNTI encrypted DCI to configure repeated transmission of Msg4, so that the terminal device can obtain the relevant configuration of repeated transmission of Msg4 before transmitting Msg4, which is conducive to improving the transmission performance of Msg4, thereby improving the success rate of the random access process and reducing communication delay. In addition, by reusing the fields in DCI to configure repeated transmission of Msg4, signaling overhead can be saved.

[0268] Method 2 for configuring repeated transmission of Msg4: Figure 8 The figure is a flow chart of a communication method provided by the present application. The method includes:

[0269] S801, the network device sends a random access response uplink grant (RAR UL grant). Correspondingly, the terminal device receives the RAR UL grant.

[0270] The RAR UL grant indicates configuration information for repeated transmission of the first message in the random access process, and the first message carries conflict resolution information. The first message may be Msg4 in a 4-step random access process, or the first message may be MsgB in a 2-step random access process.

[0271] The specific method of configuring the information of the repeated transmission of the RAR UL grant indication Msg4 will be described in detail below.

[0272] S802, the network device sends a first message according to the configuration information. Correspondingly, the terminal device receives the first message according to the configuration information.

[0273] This application configures repeated transmission of Msg4 through RAR UL grant, so that the terminal device can obtain the relevant configuration of repeated transmission of Msg4 before transmitting Msg4, which is beneficial to improving the transmission performance of Msg4, thereby improving the success rate of the random access process and reducing communication delay.

[0274] To facilitate understanding of the solution, the following description is given by taking the first message Msg4 as an example.

[0275] Two examples of configuration information for repeated transmission of the RAR UL grant indicating Msg4 are introduced below.

[0276] Example B1, the time domain resource allocation (TDRA) field in the DCI indicates the configuration information for repeated transmission of Msg.

[0277] Exemplarily, the number of repetitions may be indicated by the state of the TDRA field. For example, the N states of the time domain resource allocation field correspond to N number of repetition transmissions, where N is an integer greater than 0.

[0278] For example, 4 of the 16 states indicated by the 4 bits of the TDRA field can be used to indicate the number of repetitions of Msg4 from 1 to 4 times. For example, 4 rows in Table 6.1.2.1.1-2 of the protocol 3GPP TS 38.214V17.4.0 (2022-12), which is the default PUSCH TDRA indication table for normal cyclic prefix, can be selected as the indication state of the number of repetitions. For example, the first 4 rows in Table 6.1.2.1.1-2 of the protocol 3GPP TS 38.214V17.4.0 (2022-12) can be selected as the indication state of the number of repetitions, as shown in Table 5. Since the processing delay corresponding to the first 4 rows may exceed the scheduling delay, these scheduling configuration parameters are actually not available and can be used to indicate the number of repetitions of Msg4.

[0279] Table 5

[0280] Row index PUSCH mapping type K2 S L Repetitions 1 Type A j 0 14 1 2 Type A j 0 12 2 3 Type A j 0 10 3 4 Type B j 2 10 4 5 Type B j 4 10 6 Type B j 4 8 7 Type B j 4 6 8 Type A j+1 0 14 9 Type A j+1 0 12 10 Type A j+1 0 10 11 Type A j+2 0 14 12 Type A j+2 0 12 13 Type A j+2 0 10 14 Type B j 8 6 15 Type A j+3 0 14 16 Type A j+3 0 10

[0281] Among them, K2 is the number of time slots in the interval, S is the starting symbol, and L is the symbol length.

[0282] It should be understood that Table 5 is only an exemplary description, and the present application does not limit the row index indicating the number of repeated transmissions, the number of repetitions indicated, and the correspondence between the row index and the number of repetitions.

[0283] Example B2: The frequency domain resource allocation field and the frequency hopping field in the RAR UL grant indicate configuration information for repeated transmission of the first message.

[0284] Exemplarily, P bits indicate the number of times the first message is repeatedly transmitted, the P bits include at least one bit in the frequency domain resource allocation field and at least one bit in the frequency hopping field, and P is an integer greater than 1.

[0285] For example, 1 bit is selected from the 14 bits of the FDRA field of the RAR UL grant, and 1 bit of the frequency hopping field indicating whether frequency hopping is performed is used to jointly indicate the number of repetitions of Msg4. The FDRA field has 14 bits in total. When the UE is a REDCAP UE or an EREDCAP UE, only 13 bits are needed at most to indicate the frequency domain resource configuration of 106 resource blocks (RBs), so there will be 1 reserved bit. In this implementation mode, the number of repetitions of Msg4 can be jointly indicated by 1 reserved bit of the FDRA field and 1 bit of the field indicating whether frequency hopping is performed.

[0286] The above method uses a field indicating whether frequency hopping is used to indicate the number of repetitions of Msg4, so the information on whether frequency hopping is used can be indicated by other methods, for example, the information on whether frequency hopping is used can be indicated by a frequency hopping offset indication field. For example, when the size of the bandwidth part (BWP) is greater than or equal to 50, the frequency hopping offset indication field includes 2 bits, and the present application can indicate frequency hopping and frequency hopping offset by the value states 00, 01 and 10 of the frequency hopping offset indication field, and indicate no frequency hopping by the value state 11.

[0287] In the present application, the terminal device may also determine the priority of obtaining the repeated transmission of Msg4 before configuring the repeated transmission of Msg4. For example, before the above S701, the network device may send the second information to the terminal device, and the second information is used to indicate the priority of the repeated transmission of Msg4. Exemplarily, the second information may be included in SIB1. For a specific implementation, please refer to Figure 6 The relevant descriptions of the method will not be repeated here.

[0288] This application adopts RAR UL grant to configure Msg4 repeated transmission, so that the terminal device can obtain the relevant configuration of Msg4 repeated transmission before transmitting Msg4, which is conducive to improving the transmission performance of Msg4, thereby improving the success rate of the random access process and reducing communication delay. In addition, by reusing the fields in RAR UL grant to configure Msg4 repeated transmission, signaling overhead can be saved.

[0289] Based on the same inventive concept as the method embodiment, the present application embodiment provides a communication device, the structure of which can be as follows: Fig. 9 As shown, it includes a communication unit 901 and a processing unit 902.

[0290] In one embodiment, the communication device can be used to implement Figure 6 In the embodiment of the method executed by the terminal device, the device may be the terminal device itself, or a chip or a chipset in the terminal device or a part of the chip used to execute the function of the related method. The processing unit 902 is used to send the first information through the communication unit 901, and the first information is used to request the network device to send the first message in the random access process by repeated transmission. The first message carries conflict resolution information, and the first information includes at least one of the following: a preamble or a logical channel identifier; and receiving the first message through the communication unit 901.

[0291] Exemplarily, the first information includes a first preamble code, and the first preamble code is used to request to send the first message by repeated transmission; or, the first information is carried on a first random access resource, and the first random access resource is used to request to send the first message by repeated transmission; or, the first information includes a first logical channel identifier, and the first logical channel identifier is used to request to send the first message by repeated transmission.

[0292] Exemplarily, the first preamble belongs to a preamble set, and the preamble set may further include a second preamble, and the second preamble is used to indicate a second message in a repeated transmission random access process, and the second message is carried through a physical uplink shared channel.

[0293] Exemplarily, the first preamble code is also used to request to send a second message in the random access process by repeated transmission, and the second message is carried by a physical uplink shared channel.

[0294] An exemplary value of the first logical channel identifier is 39, 40, 41, 42 or 47.

[0295] Optionally, the processing unit 902 is further used to: receive second information through the communication unit 901, where the second information is used to indicate the priority of repeated transmission of the first message.

[0296] In one embodiment, the communication device can be used to implement Figure 6 In the embodiment of the method executed by the network device, the device may be the network device itself, or a chip or chipset in the network device or a part of the chip used to execute the function of the related method. Among them, the processing unit 902 is used to receive the first information through the communication unit 901, and the first information is used to request the network device to send the first message in the random access process by repeated transmission. The first message carries conflict resolution information, and the first information includes at least one of the following: a preamble or a logical channel identifier. And, the first message is sent through the communication unit 901 by repeated transmission.

[0297] Exemplarily, the first information includes a first preamble code, and the first preamble code is used to request to send the first message by repeated transmission; or, the first information is carried on a first random access resource, and the first random access resource is used to request to send the first message by repeated transmission; or, the first information includes a first logical channel identifier, and the first logical channel identifier is used to request to send the first message by repeated transmission.

[0298] Exemplarily, the first preamble belongs to a preamble set, and the preamble set may further include a second preamble, and the second preamble is used to indicate a second message in a repeated transmission random access process, and the second message is carried through a physical uplink shared channel.

[0299] Exemplarily, the first preamble code is also used to request to send a second message in the random access process by repeated transmission, and the second message is carried by a physical uplink shared channel.

[0300] Exemplarily, the value of the first logical channel identifier is 39, 40, 41, 42 or 47.

[0301] Optionally, the processing unit 902 is further used to: send second information through the communication unit 901, where the second information is used to indicate the priority of repeated transmission of the first message.

[0302] In one embodiment, the communication device can be used to implement Figure 7 In the embodiment of the method performed by the terminal device, the device may be the terminal device itself, or a chip or chipset in the terminal device or a part of the chip for performing the function of the related method. The processing unit 902 is used to receive the DCI through the communication unit 901, the DCI is scrambled by TC-RNTI, the DCI indicates the configuration information of the repeated transmission of the first message in the random access process, and the first message carries the conflict resolution information; and receive the first message through the communication unit 901 according to the configuration information.

[0303] Exemplarily, the MCS field or the downlink allocation index field in the DCI indicates the number of times the first message is repeatedly transmitted; or, the downlink allocation index field in the DCI is used to indicate the repeated transmission or non-repeated transmission of the first message, and the MCS field in the DCI is used to indicate the number of repeated transmissions of the first message when the downlink allocation index field indicates the repeated transmission of the first message; or, the MCS field in the DCI is used to indicate the repeated transmission or non-repeated transmission of the first message, and the downlink allocation index field in the DCI is used to indicate the number of repeated transmissions of the first message when the MCS field indicates the repeated transmission of the first message.

[0304] Optionally, the processing unit 902 is further used to: receive second information, where the second information is used to indicate the priority of repeated transmission of the first message.

[0305] In one embodiment, the communication device can be used to implement Figure 7 In the embodiment of the method performed by the network device, the device may be the network device itself, or a chip or chipset in the network device or a part of the chip used to perform the function of the related method. The processing unit 902 is used to send DCI through the communication unit 901, the DCI is scrambled by TC-RNTI, the DCI indicates the configuration information of the repeated transmission of the first message in the random access process, and the first message carries conflict resolution information; and send the first message through the communication unit 901 according to the configuration information.

[0306] Exemplarily, the MCS field or the downlink allocation index field in the DCI indicates the number of times the first message is repeatedly transmitted; or, the downlink allocation index field in the DCI is used to indicate the repeated transmission or non-repeated transmission of the first message, and the MCS field in the DCI is used to indicate the number of repeated transmissions of the first message when the downlink allocation index field indicates the repeated transmission of the first message; or, the MCS field in the DCI is used to indicate the repeated transmission or non-repeated transmission of the first message, and the downlink allocation index field in the DCI is used to indicate the number of repeated transmissions of the first message when the MCS field indicates the repeated transmission of the first message.

[0307] Optionally, the processing unit 902 is further used to: send second information through the communication unit 901, where the second information is used to indicate the priority of repeated transmission of the first message.

[0308] In one embodiment, the communication device can be used to implement Figure 8 The method performed by the terminal device in the embodiment of the present invention may be the terminal device itself, or may be a chip or a chipset in the terminal device or a part of the chip used to perform the function of the related method. The processing unit 902 is used to receive the RAR UL grant through the communication unit 901, the RAR UL grant indicates the configuration information of the repeated transmission of the first message in the random access process, and the first message carries the conflict resolution information; and receive the first message through the communication unit 901 according to the configuration information.

[0309] Exemplarily, the time domain resource allocation field in RAR UL grantI indicates configuration information for repeated transmission of the first message.

[0310] Exemplarily, the N states of the time domain resource allocation field correspond one-to-one to N repeated transmission times, where N is an integer greater than 0.

[0311] Exemplarily, the frequency domain resource allocation field and the frequency hopping field in the RAR UL grant indicate configuration information for repeated transmission of the first message.

[0312] Exemplarily, P bits indicate the number of times the first message is repeatedly transmitted, the P bits include at least one bit in the frequency domain resource allocation field and at least one bit in the frequency hopping field, and P is an integer greater than 1.

[0313] Optionally, the processing unit 902 is further used to: receive second information through the communication unit 901, where the second information is used to indicate the priority of repeated transmission of the first message.

[0314] In one embodiment, the communication device can be used to implement Figure 5The method executed by the network device in the embodiment of the present invention may be the network device itself, or a chip or a chipset in the network device or a part of the chip used to execute the function of the related method. The processing unit 902 is used to send a RAR UL grant through the communication unit 901, where the RAR UL grant indicates the configuration information of the repeated transmission of the first message in the random access process, and the first message carries the conflict resolution information; and send the first message through the communication unit 901 according to the configuration information.

[0315] Exemplarily, the time domain resource allocation field in the RAR UL grant indicates configuration information for repeated transmission of the first message.

[0316] Exemplarily, the N states of the time domain resource allocation field correspond one-to-one to N repeated transmission times, where N is an integer greater than 0.

[0317] Exemplarily, the frequency domain resource allocation field and the frequency hopping field in the RAR UL grant indicate configuration information for repeated transmission of the first message.

[0318] Exemplarily, P bits indicate the number of times the first message is repeatedly transmitted, the P bits include at least one bit in the frequency domain resource allocation field and at least one bit in the frequency hopping field, and P is an integer greater than 1.

[0319] Optionally, the processing unit 902 is further used to: send second information through the communication unit 901, where the second information is used to indicate the priority of repeated transmission of the first message.

[0320] The division of modules in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present application may be integrated into a processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules. It is understood that the functions or implementations of each module in the embodiments of the present application may further refer to the relevant description of the method embodiment.

[0321] In one possible approach, the communication device may be as follows Fig.10 As shown, the device can be a communication device or a chip in a communication device, wherein the communication device can be a terminal device in the above embodiment or a network device in the above embodiment. The device includes a processor 1001 and a communication interface 1002, and can also include a memory 1003. Among them, the processing unit 902 can be the processor 1001. The communication unit 901 can be the communication interface 1002. Optionally, the processor 1001 and the memory 1003 can also be integrated together.

[0322] The processor 1001 may be a CPU, or a digital processing unit, etc. The communication interface 1002 may be a transceiver, or an interface circuit such as a transceiver circuit, or a transceiver chip, etc. The device further includes: a memory 1003, which is used to store the program executed by the processor 1001. The memory 1003 may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or a volatile memory (volatile memory), such as a random-access memory (RAM). The memory 1003 is any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.

[0323] The processor 1001 is used to execute the program code stored in the memory 1003, specifically to execute the actions of the processing unit 902, which will not be described in detail in this application. The communication interface 1002 is specifically used to execute the actions of the communication unit 901, which will not be described in detail in this application.

[0324] The specific connection medium between the communication interface 1002, the processor 1001 and the memory 1003 is not limited in the embodiment of the present application. Fig.10 In the embodiment, the memory 1003, the processor 1001 and the communication interface 1002 are connected via a bus 1004. Fig.10 The connections between other components are shown in bold lines, which are only for illustration and are not intended to be limiting. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.10 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0325] An embodiment of the present invention further provides a computer-readable storage medium for storing computer software instructions required to be executed by the above-mentioned processor, which includes a program required to be executed by the above-mentioned processor.

[0326] The present application also provides a communication system, including a Figure 6 In the embodiment of the terminal device function and the communication device for realizing Figure 6 The communication device of the network device function in the embodiment.

[0327] The present application also provides a communication system, including a Figure 7 In the embodiment of the terminal device function and the communication device for realizing Figure 7The communication device of the network device function in the embodiment.

[0328] The present application also provides a communication system, including a Figure 8 In the embodiment of the terminal device function and the communication device for realizing Figure 8 The communication device of the network device function in the embodiment.

[0329] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0330] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0331] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0332] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0333] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A communication method, characterized in that: The method comprises: Sending first information, where the first information is used to request a network device to send a first message in a random access process in a repeated transmission manner, where the first message carries conflict resolution information, and the first information includes at least one of the following: a preamble or a logical channel identifier; The first message is received.

2. The method according to claim 1, characterized in that The first information is used to request the network device to send the first message in the random access process by repeated transmission, including at least one of the following: The first information includes a first preamble code, and the first preamble code is used to request to send the first message by repeated transmission; Alternatively, the first information is carried on a first random access resource, and the first random access resource is used to request to send the first message by repeated transmission; Alternatively, the first information includes a first logical channel identifier, and the first logical channel identifier is used to request to send the first message by repeated transmission.

3. The method according to claim 2, characterized in that The first preamble belongs to a preamble set, and the preamble set may further include a second preamble, where the second preamble is used to indicate a second message in a repeated transmission random access process, and the second message is carried through a physical uplink shared channel; Alternatively, the first preamble code is further used to request to send a second message in the random access process by repeated transmission, and the second message is carried by a physical uplink shared channel.

4. The method according to claim 2 or 3, characterized in that The value of the first logical channel identifier is 39, 40, 41, 42 or 47.

5. The method according to any one of claims 1 or 2, characterized in that: Before sending the first information, the method further includes: Second information is received, where the second information is used to indicate a priority for repeated transmission of the first message.

6. A communication method, characterized in that: The method comprises: Receive first information, where the first information is used to request a network device to send a first message in a random access process by repeated transmission, where the first message carries conflict resolution information, and the first information includes at least one of the following: a preamble or a logical channel identifier; The first message is sent in a repeated transmission manner.

7. The method according to claim 6, characterized in that The first information is used to request the network device to send the first message in the random access process by repeated transmission, including at least one of the following: The first information includes a first preamble code, and the first preamble code is used to request to send the first message by repeated transmission; Alternatively, the first information is carried on a first random access resource, and the first random access resource is used to request to send the first message by repeated transmission; Alternatively, the first information includes a first logical channel identifier, and the first logical channel identifier is used to request to send the first message by repeated transmission.

8. The method according to claim 7, characterized in that The first preamble belongs to a preamble set, and the preamble set may further include a second preamble, where the second preamble is used to indicate a second message in a repeated transmission random access process, and the second message is carried through a physical uplink shared channel; Alternatively, the first preamble code is further used to request to send a second message in the random access process by repeated transmission, and the second message is carried by a physical uplink shared channel.

9. The method according to claim 7 or 8, characterized in that The value of the first logical channel identifier is 39, 40, 41, 42 or 47.

10. The method according to claim 6 or 7, characterized in that: Before receiving the first information, the method further includes: Sending second information, where the second information is used to indicate a priority for repeated transmission of the first message.

11. A communication method, characterized in that: The method comprises: receiving downlink control information DCI, where the DCI is scrambled by a temporary cell radio network temporary identifier TC-RNTI, where the DCI indicates configuration information for repeated transmission of a first message in a random access process, where the first message carries conflict resolution information; The first message is received according to the configuration information.

12. The method according to claim 11, characterized in that The DCI indicates configuration information for repeated transmission of a first message in a random access process, including: The modulation and coding scheme MCS field or the downlink allocation index field in the DCI indicates the number of times the first message is repeatedly transmitted; Alternatively, the downlink allocation index field in the DCI is used to indicate repeated transmission or non-repeated transmission of the first message, and the MCS field in the DCI is used to indicate the number of repeated transmissions of the first message when the downlink allocation index field indicates repeated transmission of the first message; Alternatively, the MCS field in the DCI is used to indicate repeated transmission or non-repeated transmission of the first message, and the downlink allocation index field in the DCI is used to indicate the number of repeated transmissions of the first message when the MCS field indicates repeated transmission of the first message.

13. The method according to claim 11 or 12, characterized in that The method further comprises: Second information is received, where the second information is used to indicate a priority for repeated transmission of the first message.

14. A communication method, characterized in that: The method comprises: Sending downlink control information DCI, where the DCI is scrambled by a temporary cell radio network temporary identifier TC-RNTI, where the DCI indicates configuration information for repeated transmission of a first message in a random access process, where the first message carries conflict resolution information; The first message is sent according to the configuration information.

15. The method according to claim 14, characterized in that The DCI indicates configuration information for repeated transmission of a first message in a random access process, including: The modulation and coding scheme MCS field or the downlink allocation index field in the DCI indicates the number of times the first message is repeatedly transmitted; Alternatively, the downlink allocation index field in the DCI is used to indicate repeated transmission or non-repeated transmission of the first message, and the MCS field in the DCI is used to indicate the number of repeated transmissions of the first message when the downlink allocation index field indicates repeated transmission of the first message; Alternatively, the MCS field in the DCI is used to indicate repeated transmission or non-repeated transmission of the first message, and the downlink allocation index field in the DCI is used to indicate the number of repeated transmissions of the first message when the MCS field indicates repeated transmission of the first message.

16. The method according to claim 14 or 15, characterized in that The method further comprises: Sending second information, where the second information is used to indicate a priority for repeated transmission of the first message.

17. A communication method, characterized in that: The method comprises: receiving a random access response uplink grant RAR UL grant, where the RAR UL grant indicates configuration information for repeated transmission of a first message in a random access process, where the first message carries conflict resolution information; The first message is received according to the configuration information.

18. The method according to claim 17, characterized in that The RAR UL grant indicates configuration information for repeated transmission of the first message in the random access process, including: The time domain resource allocation field in the RAR UL grant indicates configuration information for repeated transmission of the first message.

19. The method according to claim 18, characterized in that The N states of the time domain resource allocation field correspond one-to-one to N repeated transmission times, where N is an integer greater than 0.

20. The method of claim 17, wherein: The RAR UL grant indicates configuration information for repeated transmission of the first message in the random access process, including: The frequency domain resource allocation field and the frequency hopping field in the RAR UL grant indicate configuration information for repeated transmission of the first message.

21. The method of claim 20, wherein: The frequency domain resource allocation field and the frequency hopping field indicate configuration information for repeated transmission of the first message, including: P bits indicate the number of times the first message is repeatedly transmitted, the P bits include at least one bit in the frequency domain resource allocation field and at least one bit in the frequency hopping field, and P is an integer greater than 1.

22. The method according to any one of claims 17 to 21, characterized in that: The method further comprises: Second information is received, where the second information is used to indicate a priority for repeated transmission of the first message.

23. A communication method, characterized in that: The method comprises: Sending a random access response uplink grant RAR UL grant, where the RAR UL grant indicates configuration information for repeated transmission of a first message in a random access process, where the first message carries conflict resolution information; The first message is sent according to the configuration information.

24. The method of claim 23, wherein: The RAR UL grant indicates configuration information for repeated transmission of the first message in the random access process, including: The time domain resource allocation field in the RAR UL grant indicates configuration information for repeated transmission of the first message.

25. The method of claim 24, wherein: The N states of the time domain resource allocation field correspond one-to-one to N repeated transmission times, where N is an integer greater than 0.

26. The method of claim 23, wherein: The RAR UL grant indicates configuration information for repeated transmission of the first message in the random access process, including: The frequency domain resource allocation field and the frequency hopping field in the RAR UL grant indicate configuration information for repeated transmission of the first message.

27. The method of claim 26, wherein: The frequency domain resource allocation field and the frequency hopping field indicate configuration information for repeated transmission of the first message, including: P bits indicate the number of times the first message is repeatedly transmitted, the P bits include at least one bit in the frequency domain resource allocation field and at least one bit in the frequency hopping field, and P is an integer greater than 1.

28. The method according to any one of claims 23 to 27, characterized in that The method further comprises: Sending second information, where the second information is used to indicate a priority for repeated transmission of the first message.

29. A communication device, characterized in that: The method comprises a unit or module for executing the method as claimed in any one of claims 1 to 5, or a unit or module for executing the method as claimed in any one of claims 6 to 10, or a unit or module for executing the method as claimed in any one of claims 11 to 13, or a unit or module for executing the method as claimed in any one of claims 14 to 16, or a unit or module for executing the method as claimed in any one of claims 17 to 22, or a unit or module for executing the method as claimed in any one of claims 23 to 28.

30. A computer-readable storage medium, characterized in that: The computer storage medium stores computer-readable instructions, and when the computer-readable instructions are executed on the communication device, the method according to any one of claims 1 to 5 is executed, or the method according to any one of claims 6 to 10 is executed, or the method according to any one of claims 11 to 13 is executed, or the method according to any one of claims 14 to 16 is executed, or the method according to any one of claims 17 to 22 is executed, or the method according to any one of claims 23 to 28 is executed.

31. A computer program product, characterized in that When the computer program product is executed on a device, the device is caused to execute the method according to any one of claims 1 to 28.

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