WO2022134030A1

WO2022134030A1 - Data transmission method and apparatus

Info

Publication number: WO2022134030A1
Application number: PCT/CN2020/139520
Authority: WO
Inventors: 张云昊; 郭英昊; 吴艺群
Original assignee: 华为技术有限公司
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2022-06-30
Also published as: CN116530191A

Abstract

The present application provides a data transmission method and apparatus. In the method, a terminal device sends first data to an access network device by means of a pre-configured grant resource during the RRC inactive state; then transmission instruction information is received from the access network device, the transmission instruction information being used for instructing the terminal device to switch a data transmission mode or continue data transmission; the terminal device sends second data to the access network device according to the transmission instruction information, or receives third data sent by the access network device. In this solution, during the RRC inactive state, the terminal device can receive the transmission instruction information sent by the access network device, and the terminal device can perform data transmission according to the transmission instruction information or continue data transmission, avoiding resource waste caused by blindly attempting to switch the data transmission mode by the terminal device, and improving data transmission efficiency.

Description

A data transmission method and device

technical field

The present application relates to the field of communication technologies, and in particular, to a data transmission method and apparatus.

Background technique

In a communication system, after a terminal device is connected to an access network device, a radio resource control (radio resource control, RRC) connection is established with the access network device. In order to save the power consumption of the terminal, the RRC connection can include three states: RRC connected state, RRC idle state, and RRC inactive state. When there is a communication requirement between the terminal device and the access network device, the terminal device enters the RRC connected state, and when the terminal device and the access network device do not need to communicate, the terminal device enters the RRC idle state or the RRC inactive state.

When the terminal device is in the RRC inactive state, it can perform pre-configured grant-small data transmission (CG-SDT) based on grant-free scheduling (GF). CG-SDT refers to the access network. The device pre-configures the physical uplink shared channel (PUSCH) for the terminal device for uplink data transmission in a semi-static manner. When the terminal device has uplink data to send to the access network device, the terminal device can directly Using the preconfigured PUSCH resources and parameters to send data to the access network device, there is no need to receive the dynamic grant (DG) of the access network device, nor to send a random access preamble to the access network device.

When the terminal device is in the RRC inactive state, it can also perform random access-small data transmission (RA-SDT) based on the random access process. The network device sends uplink small data (small data, SD).

SUMMARY OF THE INVENTION

The present application provides a data transmission method and device to improve the flexibility of small packet data transmission.

In the first aspect, an embodiment of the present application provides a data transmission method, and the method can be applied to a terminal device or a chip in the terminal device. Taking the method applied to a terminal device as an example, the method includes: the terminal device is in the RRC inactive state. During the state process, the first data is sent to the access network device through the preconfigured authorization resource; and then the transmission indication information from the access network device is received, and the transmission indication information is used to instruct the terminal device to switch the data transmission mode or Continue the data transmission; the terminal device sends the second data to the access network device according to the transmission indication information, or receives the third data sent by the access network device.

In the above method, after the terminal device sends the first data to the access network device through the CG resource during the RRC inactive state, it can receive the transmission indication information sent by the access network device, and the terminal device can perform data processing according to the transmission indication information. Switching the transmission mode or continuing the current data transmission, realizing flexible data transmission, avoiding the waste of resources caused by the terminal device blindly trying to switch the data transmission mode, and improving the data transmission efficiency.

Optionally, the access network device sends downlink control information to the terminal device, where the downlink control information includes transmission indication information. Wherein, the transmission indication information may be downlink control information scrambled by the wireless network temporary identifier dedicated to the inactive CG-SDT configured by the access network device to the terminal device, for example, the access network device configured to the terminal device. The wireless network temporary identifier for CG-SDT may be SDT-RNTI or CG-RNTI.

In a possible design, the transmission indication information includes at least one of the following: power control indication, transmission mode switching indication, correct response to the first data, physical uplink shared channel PUSCH scheduling information, physical downlink shared channel PDSCH scheduling information, timing advance adjustment instruction, modulation and coding strategy adjustment instruction; wherein, the power control instruction is used to instruct the terminal device to send the transmission power of the second data; the transmission mode switching instruction is used to indicate the The terminal device switches the data transmission mode; the correct response response of the first data is used to indicate that the access network device receives the first data; the PUSCH scheduling information is used to instruct the terminal device to send on the scheduled PUSCH the second data; the PDSCH scheduling information is used to instruct the terminal equipment to receive the third data on the scheduled PDSCH; the timing advance adjustment instruction is used to instruct the terminal equipment to adjust the timing advance; the modulation and coding strategy adjustment instruction is used for It is used to instruct the terminal equipment to adjust the modulation and coding strategy.

Through the above design, the transmission indication information may include power control indication, transmission mode switching indication, correct response to the first data, physical uplink shared channel PUSCH scheduling information, physical downlink shared channel PDSCH scheduling information, timing advance adjustment indication, At least one of the modulation and coding strategy adjustment instructions, the terminal device can adjust the transmission power, timing advance, modulation and coding strategy, etc. during the data transmission process according to the transmission indication information, and can also switch the data transmission mode, and receive PUSCH or PUSCH or PDSCH scheduling information, so that the terminal device can flexibly perform data transmission.

In a possible design, when the transmission indication information includes the power control indication, the power control indication is carried in the first field of the transmission indication information; wherein the value of the first field is different At the same time, the power control indication is used to indicate different transmission powers; the terminal device sends the second data to the access network device according to the transmission indication information, including: the terminal device according to the transmission indication information The value of the first field in the power control instruction determines the target transmit power indicated by the power control instruction; the terminal device sends the access network equipment according to the target transmit power indicated by the power control instruction. Second data.

Through the above design, when the transmission indication information includes a power control indication, the terminal device can determine the target transmission power for sending the second data to the access network device according to the power control indication, so as to implement closed-loop power control during data transmission and avoid excessively high power. Transmit power wastes energy consumption, increases interference, and avoids poor reception performance due to too low transmit power.

In a possible design, when the transmission instruction information includes the transmission mode switching instruction, the transmission mode switching instruction includes: an identifier of a target data transmission mode and/or a power threshold; wherein the target transmission mode The identifier of the target transmission mode is carried in the second field of the transmission indication information. When the value of the second field is different, the identifier of the target transmission mode is used to indicate the identifier of different data transmission modes; the power threshold is the reference signal The received power threshold value of the power threshold value is carried in the third field of the transmission indication information. When the value of the third field is different, the value of the power threshold value is different.

Through the above design, when the transmission instruction information includes the transmission mode switching instruction, the terminal device can determine the target data mode and switch according to the transmission mode switching instruction, so as to avoid unnecessary resource overhead caused by the terminal device blindly trying other data transmission modes.

In a possible design, when the transmission mode switching indication includes the identifier of the target data transmission mode, the terminal device sends the second data to the access network device according to the transmission indication information, Including: when the terminal device determines that the identifier of the target transmission mode is an identifier corresponding to two-step random access data transmission, the terminal device sends the first step to the access network device through a two-step random access process. two data; or when the terminal device determines that the identifier of the target transmission mode is an identifier corresponding to the two-step random access process, the terminal device recovers from the RRC inactive state to the RRC connected state through the two-step random access process After that, send the second data to the access network device; or when the terminal device determines that the identifier of the target transmission mode is an identifier corresponding to the four-step random access data transmission, the terminal device passes the four-step The random access process sends the second data to the access network device; or when the terminal device determines that the identifier of the target transmission mode is the identifier corresponding to the four-step random access process, the terminal device uses the four-step random access process. After the step-by-step random access process is restored from the RRC inactive state to the RRC connected state, the second data is sent to the access network device.

In a possible design, when the transmission mode switching indication includes the power threshold, the terminal device sends the second data to the access network device according to the transmission indication information, including: the The terminal device determines the power threshold according to the value of the third field in the transmission indication information; when the terminal device determines that the received power of the reference signal is greater than the power threshold, the terminal device sends a random access procedure to the two-step random access process. The access network device sends the second data, or the terminal device sends the second data to the access network device after recovering from the RRC inactive state to the RRC connected state through a two-step random access process; or When the terminal device determines that the received power of the reference signal is less than or equal to the power threshold, the terminal device sends the second data to the access network device through a four-step random access procedure, or the terminal device sends the second data to the access network device through a four-step random access procedure. After the random access process is restored from the RRC inactive state to the RRC connected state, the second data is sent to the access network device.

In a possible design, when the transmission mode switching instruction includes the identifier of the target data transmission mode and the power threshold, the terminal device sends the information to the access network device according to the transmission instruction information. The second data includes: the terminal device determines the power threshold according to the value of the third field in the transmission indication information; when the terminal device determines that the identifier of the target data transmission mode is random access data When the corresponding identifier is transmitted, and the received power of the reference signal is greater than the power threshold, the terminal device sends the second data to the access network device through a two-step random access procedure; or when the terminal device determines the target The identifier of the data transmission mode is the identifier corresponding to the random access process, and when the received power of the reference signal is greater than the power threshold, after the terminal equipment recovers from the RRC inactive state to the RRC connected state through the two-step random access process, it sends the data to the RRC connection state. The access network device sends the second data; or when the terminal device determines that the identifier of the target data transmission mode is an identifier corresponding to random access data transmission, and the received power of the reference signal is less than or equal to the power threshold, The terminal device sends the second data to the access network device through the four-step random access process; or when the terminal device determines that the identifier of the target data transmission mode is the identifier corresponding to the random access process, and the reference signal When the received power is less than or equal to the power threshold, the terminal device sends second data to the access network device after recovering from the RRC inactive state to the RRC connected state through a four-step random access process.

Through the above design, the transmission mode switching instruction may include the identification and/or power threshold of the target data transmission mode, and the terminal device may determine the corresponding target data transmission mode of the transmission mode switching instruction by using the identification and/or power threshold of the target data transmission mode. Handover, the target data transmission mode determined by the above method can be a two-step random access process, a four-step random access process, a two-step random access data transmission, and a four-step random access data transmission, so that the terminal device can accurately switch to The target data transmission method improves the flexibility of data transmission.

In a possible design, the transmission indication information further includes: a contention-free random access resource indication; the contention-free random access resource indication is used to instruct the terminal device to perform random access in the two steps procedure or the resources used in the four-step random access procedure.

In a possible design, the contention-free random access resource indication includes at least one of the following index values: a random access preamble index value, a synchronization signal block index value, and a physical random access channel opportunity RO resource index value or RO resource index value range; the random access preamble index value is carried in the fourth field of the transmission indication information; the synchronization signal block index value is carried in the fifth field of the transmission indication information, so The RO resource index value or the RO resource index value range is carried in the sixth field of the transmission indication information.

In a possible design, the contention-free random access resource indication further includes: a physical uplink shared channel opportunity PO indication, where the PO indication is used to indicate the resource used by the terminal equipment in the two-step random access process For the uplink shared channel, the PO indication is carried in the seventh field of the transmission indication information.

Through the above design, the transmission indication information can also include a contention-free random access resource indication, and the terminal device can determine the contention-free random access resource indication used when switching to the random access process or random access data transmission according to the contention-free random access resource indication. Use random access resources.

In a possible design, if the transmission indication information includes a correct response response for the first data, the terminal device sends the second data to the access network device according to the transmission indication information, including: The terminal device sends the second data to the access network device through the process of sending the first data; if the transmission indication information does not include a correct response for the first data, the terminal The device sends the second data to the access network device according to the transmission indication information, including: the terminal device sends the second data to the access network device through the process of sending the first data; Wherein, the second data is the same as the first data, or the information bits of the second data and the first data are the same, or the valid information of the second data and the first data is the same, or The second data is a redundant version of the first data.

Through the above design, the terminal device can determine whether the first data needs to be retransmitted according to whether the transmission indication information includes a correct response response of the first data, and when the transmission indication information includes a correct response response of the first data, the terminal device determines the access The network device has correctly received the first data, and the terminal device can continue to send the second data to the access network device through the process of sending the first data; and when the transmission indication information does not include a correct response for the first data, the terminal device is in the The second data is sent in the process of the first data. At this time, the second data sent is the same as the first data, the information bits are the same, the valid information is the same, or the second data is a redundant version of the first data, thereby improving the reliability of data transmission. sex.

Optionally, the access network device may also send a correct response response of the first data to the terminal device through RRC signaling or MAC CE.

In a possible design, when the transmission indication information includes the PDSCH scheduling information, the terminal device receives third data sent by the access network device according to the transmission indication information, including: the terminal device The PDSCH scheduled by the transmission indication information is determined according to the PDSCH scheduling information; the terminal device receives the third data on the PDSCH scheduled by the transmission indication information.

Through the above design, the access network device sends PDSCH scheduling information to the terminal device, and the terminal device receives the third data on the scheduled PDSCH, so that the terminal device can receive the downlink data sent by the access network device in the RRC inactive state. Downstream packet data or non-packet data transmission.

In a possible design, the transmission indication information further includes: a feedback power control indication, where the feedback power control indication is used to instruct the terminal device to transmit the transmit power of the feedback information corresponding to the PDSCH, and the feedback power control indication The indication is carried in the eighth field of the transmission indication information, and when the value of the eighth field is different, the feedback power control indication is used to indicate different transmit powers.

Through the above design, when the transmission indication information includes the feedback power control indication, the terminal device can determine the transmission power of the feedback information corresponding to the PDSCH sent by the terminal device according to the feedback power control indication, and use the transmission power to send the PDSCH corresponding to the access network device. feedback information to improve the transmission performance of the feedback information.

In a possible design, if the transmission indication information does not include the correct response response of the first data and the power control indication, the terminal device receives the transmission indication information from the access network device Afterwards, the method further includes: receiving, by the terminal device, radio resource control RRC signaling sent by the access network device, where the RRC signaling includes a configuration instructing the terminal device to use the feedback power control indication as a power control indication information; the terminal device sends the second data to the access network device according to the transmission indication information, which includes: the terminal device determines, according to the value of the eighth field in the transmission indication information, the Feedback the transmission power indicated by the power control indication; the terminal device sends the second data to the access network device according to the transmission power indicated by the feedback power control indication.

Through the above design, when the transmission instruction information does not include the correct response response of the first data and the power control instruction, the access network device can instruct the terminal device to use the feedback power control instruction as the power control instruction through RRC signaling, and the terminal device can The feedback power control indication determines the transmission power and uses the transmission power to send the second data to the access network device, and the overhead of transmitting indication information is saved by multiplexing the feedback power control indication and the power control indication.

In a possible design, the RRC signaling includes a correct response response of the first data; or after the terminal device receives the transmission indication information from the access network device, the terminal device further includes: the terminal device A medium access control MAC control element CE sent by the access network device is received, where the MAC CE includes a correct response response of the first data.

Through the above design, the terminal device can also receive the correct response response of the first data sent by the access network device through RRC signaling or MAC CE.

In a possible design, the PUSCH scheduling information is retransmission PUSCH scheduling information or newly transmitted PUSCH scheduling information; when the PUSCH scheduling information is retransmission PUSCH scheduling information, the terminal device according to the transmission indication information, Sending the second data to the access network device includes: the terminal device sending the second data to the access network device on the PUSCH scheduled by the retransmission PUSCH scheduling information, wherein the first The second data is the same as the first data, or the information bits of the second data and the first data are the same, or the valid information of the second data and the first data is the same, or the second data is a redundant version of the first data; when the PUSCH scheduling information is newly transmitted PUSCH scheduling information, the terminal device sends second data to the access network device according to the transmission indication information, including: The terminal device sends the second data to the access network device on the PUSCH scheduled by the PUSCH scheduling newly transmitted information.

Through the above design, when the transmission indication information includes PUSCH scheduling information, the PUSCH scheduling information may be retransmitted PUSCH scheduling information or newly transmitted PUSCH scheduling information, and the terminal device may determine, according to the PUSCH scheduling information, to retransmit the first data or the first data on the scheduled PUSCH. The second data is sent on the scheduled PUSCH to realize uplink small packet data transmission and improve the accuracy of data transmission.

In a possible design, when the transmission indication information includes the timing advance adjustment indication, the timing advance adjustment indication is carried in the ninth field of the transmission indication information.

Optionally, the ninth field of the transmission indication information of the time adjustment indication occupation may be the same as the second field or the third field of the transmission mode switching indication occupation.

In a possible design, before the terminal device sends the second data to the access network device or receives the third data sent by the access network device according to the transmission indication information, the method further includes: The terminal device determines a target timing advance according to the timing advance adjustment instruction, and adjusts the timing advance of the terminal device according to the target timing advance.

Optionally, the timing advance adjustment instruction may include the target timing advance or the relative timing advance.

Through the above design, the transmission instruction information may also include a timing advance adjustment instruction, and the terminal device can adjust the timing advance according to the timing advance adjustment instruction to maintain uplink synchronization with the access network equipment.

Optionally, when the terminal device receives the TA adjustment instruction and performs TA adjustment according to the TA adjustment instruction, it can restart the TA validity timer. If the TA validity timer does not expire, the TA of the terminal device is valid, otherwise, the TA of the terminal device is invalid.

In a possible design, when the transmission indication information includes the modulation and coding strategy adjustment indication, the modulation and coding strategy adjustment indication is carried in the tenth field of the transmission indication information, and the tenth field takes the value of When the values are different, the modulation and coding strategy adjustment indication is used to indicate different modulation and coding strategies.

In a possible design, before the terminal device sends the second data to the access network device or receives the third data sent by the access network device according to the transmission indication information, the method further includes: The terminal device adjusts the modulation and coding strategy of the terminal device according to the modulation and coding strategy adjustment instruction.

Through the above design, the transmission indication information may also include modulation and coding strategy adjustment instructions, and the terminal device can adjust the modulation and coding strategy according to the modulation and coding strategy adjustment instructions to adjust the data transmission block size.

In a second aspect, an embodiment of the present application provides a data transmission method, which can be applied to an access network device or a chip in an access network device. Taking the method applied to an access network device as an example, the method includes: The access network device receives the first data sent by the terminal device in the RRC inactive state through the preconfigured authorization resource; then the access network device sends transmission indication information to the terminal device, where the transmission indication information is used for Instruct the terminal device to switch the data transmission mode or continue data transmission; the access network device receives the second data sent by the terminal device, or sends third data to the terminal device.

Through the above method, after receiving the first data sent by the terminal device in the RRC inactive state through the preconfigured authorized resources, the access network device sends transmission indication information to the terminal device to instruct the terminal device to switch the data transmission mode or Continue data transmission, realize flexible data transmission, avoid resource waste caused by terminal equipment blindly trying to switch data transmission modes, and improve data transmission efficiency.

Through the above design, the transmission indication information may include power control indication, transmission mode switching indication, correct response to the first data, physical uplink shared channel PUSCH scheduling information, physical downlink shared channel PDSCH scheduling information, timing advance adjustment indication, At least one of the modulation and coding strategy adjustment instructions, the access network device may instruct the terminal device to adjust the transmission power, timing advance, modulation and coding strategy, etc. during data transmission by sending transmission indication information to the terminal device, and may also indicate The terminal equipment switches the data transmission mode and instructs the terminal equipment PUSCH or PDSCH scheduling information, so that the terminal equipment can flexibly perform data transmission.

In a possible design, when the transmission indication information includes the power control indication, the power control indication is carried in the first field of the transmission indication information; wherein the value of the first field is different Meanwhile, the power control indication is used to indicate different transmit powers.

Through the above design, when the transmission indication information includes a power control indication, the access network device indicates to the terminal device the target transmit power of the second data to be sent by the terminal device through the power control indication, so as to realize closed-loop power control in the data transmission process and avoid excessive power consumption. High transmit power wastes energy consumption, increases interference, and avoids poor reception performance due to too low transmit power.

In a possible design, when the transmission instruction information includes the transmission mode switching instruction, the transmission mode switching instruction includes: an identifier of a target data transmission mode and/or a power threshold; wherein, the target transmission mode The identifier is carried in the second field of the transmission indication information, and when the value of the second field is different, the target transmission mode is used to indicate different data transmission modes; the power threshold is the received power threshold of the reference signal, The power threshold is carried in the third field of the transmission indication information, and when the value of the third field is different, the value of the power threshold is different.

In a possible design, the receiving, by the access network device, the second data sent by the terminal device includes: the access network device receiving the terminal device through a two-step random access process or a four-step random access process The second data sent by the process; or the access network device receives the second data sent by the terminal device after the terminal device recovers from the RRC inactive state to the RRC connected state through the two-step random access process or the four-step random access process. .

Through the above design, when the transmission instruction information includes a transmission mode switching instruction, the access network device can indicate the target data mode to the terminal device through the transmission mode switching instruction, so as to avoid unnecessary resource overhead caused by the terminal device blindly trying other data transmission modes.

In a possible design, the contention-free random access resource indication further includes: a physical uplink shared channel opportunity PO indication, where the PO indication is used to indicate the uplink shared channel used in the two-step random access process, The PO indication is carried in the seventh field of the transmission indication information.

Through the above design, the transmission indication information can also include a contention-free random access resource indication, and the access network device can indicate to the terminal device the contention-free random access used by the terminal device during the random access process or random access data transmission. into resources.

In a possible design, when the transmission indication information includes a correct response response of the first data, the access network device receives the second data sent by the terminal device, including: the access network device The device receives the second data sent by the terminal device through the process of sending the first data; when the transmission indication information does not include a correct response for the first data, the access network device receives The second data sent by the terminal device includes: receiving, by the access network device, second data sent by the terminal device through the process of sending the first data; wherein the second data is the same as the first data. The data are the same, or the information bits of the second data and the first data are the same, or the valid information of the second data and the first data are the same, or the second data is the same as the first data. Redundant version.

Through the above design, when the access network device determines that the first data is correctly received, it sends a correct response response of the first data to the terminal device by transmitting the indication information, and when it is determined that the first data is not correctly received, transmits the indication information. The correct response response of the first data is not included, so that the terminal device is instructed to resend the first data, thereby improving the reliability of data transmission.

In a possible design, when the transmission indication information includes the PDSCH scheduling information, the access network device sends third data to the terminal device, including: the access network device schedules the PDSCH in the PDSCH schedule. The third data is sent to the terminal device on the PDSCH of the information scheduling.

In a possible design, the transmission indication information further includes a feedback power control indication, where the feedback power control indication is used to instruct the terminal device to transmit the transmit power of the feedback information corresponding to the PDSCH; the feedback power control indication It is carried in the eighth field of the transmission indication information, and when the value of the eighth field is different, the feedback power control indication is used to indicate different transmit powers.

Through the above design, when the transmission indication information includes the feedback power control indication, the access network device can instruct the terminal device to send the transmission power of the feedback information corresponding to the PDSCH to the terminal device through the feedback power control indication, so that the terminal device can use the transmission power to send the transmission power to the access network. The network access device sends the feedback information corresponding to the PDSCH to improve the data transmission performance.

In a possible design, when the transmission indication information does not include the correct response response of the first data and the power control indication, after the access network device sends the transmission indication information to the terminal device , and further comprising: the access network device sends radio resource control RRC signaling to the terminal device, where the RRC signaling includes configuration information instructing the terminal device to use the feedback power control indication as a power control indication.

In a possible design, the RRC signaling includes a correct response response of the first data; or after the access network device sends transmission indication information to the terminal device, further includes: the access network device The network device sends a medium access control MAC control element CE to the terminal device, where the MAC CE includes a correct response response corresponding to the first data.

Through the above design, the access network device can respond correctly to the first data sent by the terminal device through RRC signaling or MAC CE.

In a possible design, the PUSCH scheduling information is retransmission PUSCH scheduling information or newly transmitted PUSCH scheduling information; when the PUSCH scheduling information is retransmission PUSCH scheduling information, the access network device receives the terminal device The sent second data includes: the access network device receives second data sent by the terminal device on the PUSCH scheduled by the retransmitted PUSCH scheduling information, wherein the second data is the same as the first data The data are the same, or the information bits of the second data and the first data are the same, or the valid information of the second data and the first data are the same, or the second data is the same as the first data. Redundancy version; when the PUSCH scheduling information is the newly transmitted PUSCH scheduling information, the access network device receives the second data sent by the terminal device, including: the access network device schedules the retransmission PUSCH On the PUSCH scheduled by the information, the second data sent by the terminal device is received.

Through the above design, when the transmission indication information includes PUSCH scheduling information, the PUSCH scheduling information can be retransmission PUSCH scheduling information or newly transmitted PUSCH scheduling information, and the access network device can send the retransmission PUSCH scheduling information to the terminal device through the transmission indication information to Instruct the terminal device to resend the first data on the scheduled PUSCH, or send the new PUSCH scheduling information to the terminal device to instruct the terminal device to send the second data on the scheduled PUSCH, realize uplink small packet data transmission, and improve the accuracy of data transmission sex.

Through the above design, the access network device can send a timing advance adjustment instruction to the terminal device by transmitting the instruction information, so that the terminal device adjusts the timing advance and maintains uplink synchronization between the terminal device and the access network device.

In a possible design, when the transmission indication information includes the modulation and coding strategy adjustment indication, the modulation and coding strategy adjustment indication is carried in the tenth field of the transmission indication information, and the tenth field When the values are different, the modulation and coding strategy adjustment indication is used to indicate different modulation and coding strategies.

Through the above design, the access network device can send the modulation and coding strategy adjustment instruction to the terminal device through the transmission instruction information, so as to instruct the terminal device to adjust the modulation and coding strategy, and then adjust the data transmission rate.

In a third aspect, an embodiment of the present application provides a second data transmission method, which can be applied to a terminal device or a chip in the terminal device. Taking the method applied to a terminal device as an example, the method includes: During the active state, the terminal device sends a random access request to the access network device; then the terminal device receives the transmission indication information from the access network device, and the transmission indication information is used to instruct the terminal device to perform data transmission. manner and/or resource; the terminal device performs data transmission according to the transmission indication information.

Through the above method, the terminal equipment can receive the transmission indication information sent by the access network equipment in the process of RRC inactive state, and the terminal equipment can determine the data transmission mode and/or resources according to the transmission indication information, without the need for the terminal equipment from the RRC After the inactive state is restored to the RRC connected state, the reconfigured resources are obtained and the data transmission mode is switched, which saves resource overhead and improves the flexibility of data transmission.

In a possible design, the transmission indication information includes at least one of the following: a transmission mode switching indication, a resource indication, and a beam indication; wherein the transmission mode switching indication is used to indicate that the terminal device is in a random access process or After the random access data transmission is completed, switch to the authorization-free scheduling data transmission; the resource indication is used to instruct the terminal equipment to perform pre-configured authorization resources when the authorization-free scheduling data transmission is performed; the beam indication is used to indicate the synchronization signal block The corresponding relationship with the preconfigured authorization resource.

Through the above design, the transmission indication information may include at least one of a transmission mode switching indication, a resource indication and a beam indication, thereby instructing the terminal device to flexibly transmit data.

In a possible design, when the transmission indication information includes the transmission mode switching indication, the transmission indication information is carried in the first field of the transmission indication information; the terminal device indicates according to the target The data transmission of the information includes: after the terminal device determines that the random access process or the random access data transmission ends, using preconfigured authorized resources to perform authorization-free scheduling data transmission; wherein, the random access data transmission is a two-step random access data transmission. Access data transmission or four-step random access data transmission, and the random access process is a two-step random access process or a four-step random access process.

Through the above design, the transmission instruction information may include a transmission mode switching instruction, and the terminal device can determine whether to perform authorization-free scheduling data transmission after the random access process or the random access data transmission according to the transmission mode switching instruction, without requiring the terminal After the device recovers from the RRC inactive state to the RRC connected state, it obtains the reconfigured resources and switches the data transmission mode to save resource overhead.

In a possible design, when the transmission indication information includes the resource indication, the resource indication is carried in a second field of the transmission indication information, wherein the second field has different values, and the The resource indication is used to indicate activation of different preconfigured authorized resources.

Through the above design, the transmission indication information can include a resource indication, and the terminal device can determine the preconfigured authorized resource activated by the resource indication according to the resource indication, so as to be used when the terminal device performs authorization-free scheduling data transmission.

In a possible design, when the transmission indication information includes the beam indication, the beam indication is carried in a third field of the transmission indication information, wherein when the values of the third field are different, the The beam indication is used to indicate the correspondence between different synchronization signal blocks and the preconfigured grant resources.

Through the above design, the transmission indication information can include beam indication, and the terminal device can determine the correspondence between different synchronization signal blocks and the preconfigured authorized resources according to the beam indication, so that the terminal device can determine the preconfigured authorized resources when using the preconfigured authorized resources. Configure synchronization signal blocks corresponding to authorized resources to improve signal quality during data transmission.

In a possible design, the terminal device receiving the transmission indication information from the access network device includes: the terminal device receiving downlink control information sent by the access network device, where the downlink control information includes the transmission indication information.

In a possible design, the transmission indication information is carried in a reserved field in the downlink control information.

Through the above design, the transmission indication information can be included in the downlink control information, thereby saving resource overhead.

In a possible design, the terminal device receiving the transmission indication information from the access network device includes: the terminal device receiving the downlink control information sent by the access network device, and performing the downlink control information in the downlink control information. The transmission indication information is received on the scheduled physical downlink shared channel PDSCH; or the terminal device receives random access response information sent by the access network device, where the random access response information includes the transmission indication information, The random access response information is carried on the PDSCH; or the terminal device receives conflict resolution information sent by the access network device, the conflict resolution information includes the transmission indication information, and the conflict resolution information carried on the PDSCH; or the terminal device receives the radio resource control RRC signaling sent by the access network device, the RRC signaling includes the transmission indication information, and the RRC signaling is carried in the on PDSCH.

In a possible design, the medium access control MAC control element CE is carried on the PDSCH.

In a possible design, the transmission indication information is carried on a logical channel not defined in the MAC CE.

Through the above design, the transmission indication information can be carried in the PDSCH scheduled by the downlink control information, or the transmission indication information can be included in the random access response information, conflict resolution information or RRC signaling, providing a variety of transmission methods for the transmission indication information.

In a possible design, the transmission indication information further includes: a contention-free random access resource indication; the contention-free random access resource indication is used to indicate that the terminal device is in a random access process or random access Resources used in data transfer.

In a possible design, the contention-free random access resource indication further includes: a physical uplink shared channel opportunity PO indication, where the PO indication is used to indicate a two-step random access process or a two-step random access data transmission The uplink shared channel used by the terminal device, and the PO indication is carried in the seventh field of the transmission indication information.

Through the above design, the transmission indication information may also include a contention-free random access resource indication, and the terminal device can determine the contention-free random access resource used in the random access process or random access data transmission according to the contention-free random access resource indication. resource.

In a possible design, after the terminal device receives the transmission indication information from the access network device, the method further includes: sending, by the terminal device, feedback information corresponding to the transmission indication information to the access network device, the The feedback information is used to feed back whether the terminal device accepts the transmission indication of the transmission indication information.

Through the above design, after receiving the transmission indication information, the terminal device can feed back to the access network device whether to accept the transmission indication of the transmission indication information.

In a fourth aspect, an embodiment of the present application provides a second data transmission method, which can be applied to an access network device or a chip in an access network device. Taking the method applied to an access network device as an example, the method includes: : The access network device receives a random access request from the terminal device in the RRC inactive state process; the access network device sends transmission indication information to the terminal device, where the transmission indication information is used to instruct the terminal device to perform data The method and/or resource of the transmission.

Through this method, when the terminal device is in the RRC inactive state, after the access network device receives the random access request sent by the terminal device, the access network device can send transmission indication information to the terminal device, so that the random access request of the terminal device can be sent to the terminal device. Instruct the terminal device to perform data transmission mode and/or resources during the access process, without requiring the terminal device to obtain reconfigured resources and switch the data transmission mode after recovering from the RRC inactive state to the RRC connected state, saving resource overhead and improving data Transmission flexibility.

In a possible design, the transmission indication information includes at least one of the following: a transmission mode switching indication, a resource indication, and a beam indication; the transmission mode switching indication is used to indicate that the terminal device is in a random access process or random access After the incoming data transmission is completed, switch to the authorization-free scheduling data transmission; the resource indication is used to instruct the terminal equipment to perform pre-configured authorization resources when the authorization-free scheduling data transmission is performed; the beam indication is used to indicate that the synchronization signal block and all The corresponding relationship of the pre-configured authorization resources is described.

In a possible design, when the transmission indication information includes a transmission mode switching indication, the transmission indication information is carried in the first field of the transmission indication information; wherein, the random access data transmission is two One-step random access data transmission or four-step random access data transmission, and the random access process is a two-step random access process or a four-step random access process.

Through the above design, the transmission instruction information can include a transmission mode switching instruction, and the access network device can instruct the terminal equipment to switch to the authorization-free scheduling data transmission through the transmission instruction information when the terminal equipment is in the RRC inactive state, without the need for the terminal equipment. After the RRC inactive state is restored to the RRC connected state, the reconfigured resources are obtained and the data transmission mode is switched to save resource overhead.

Through the above design, the transmission indication information may include a resource indication, and the access network device may indicate the activated preconfigured authorized resource to the terminal device through the resource indication to be used when the terminal device performs authorization-free scheduling data transmission.

Through the above design, the transmission indication information may include a beam indication, and the access network device may send the corresponding relationship between the synchronization signal block and the preconfigured authorized resource to the terminal device through the beam indication, so that the terminal device can use the preconfigured authorized resource on the is determined, the synchronization signal block corresponding to the pre-configured authorization resource is determined, and the signal quality during data transmission is improved.

In a possible design, the access network device sending transmission indication information to the terminal device includes: the access network device sending downlink control information to the terminal device, where the downlink control information includes the Transmission instructions.

In a possible design, sending, by the access network device to the terminal device, transmission indication information includes: the access network device sending downlink control information to the terminal device, and when the downlink control information schedules The transmission indication information is sent on the physical downlink shared channel PDSCH; or the access network device sends random access response information to the terminal device, where the random access response information includes the transmission indication information, and the random access response information includes the transmission indication information. The access response information is carried on the PDSCH; or the access network device sends conflict resolution information to the terminal device, the conflict resolution information includes the transmission indication information, and the conflict resolution information is carried on the On the PDSCH; or the access network device sends radio resource control RRC signaling to the terminal device, the RRC signaling includes the transmission indication information, and the RRC signaling is carried on the PDSCH.

In one possible design, the contention-free random access resource indication includes at least one of the following index values: random access preamble index value, synchronization signal block index value, physical random access channel opportunity RO resource index value, or The range of RO resource index values; the random access preamble index value is carried in the fourth field of the transmission indication information; the synchronization signal block index value is carried in the fifth field of the transmission indication information, the The RO resource index value or the RO resource index value range is carried in the sixth field of the transmission indication information.

Through the above design, the transmission indication information can also include a contention-free random access resource indication, and the access network device can indicate to the terminal device through the transmission indication information the non-contention used by the terminal device in the random access process or random access data transmission. Contention for random resources.

In a possible design, after the access network device sends the transmission indication information to the terminal device, the method further includes: receiving, by the access network device, feedback information corresponding to the transmission indication information from the terminal device, The feedback information is used to feed back whether the terminal device accepts the transmission indication of the transmission indication information.

Through the above design, the access network device can learn whether the terminal device accepts the transmission instruction of the transmission instruction information through the feedback information corresponding to the transmission instruction information sent by the terminal device.

In a fifth aspect, an embodiment of the present application provides a communication apparatus, including a unit for performing each step in any of the above aspects.

In a sixth aspect, an embodiment of the present application provides a communication apparatus, the communication apparatus includes a processor, a memory, and a communication interface, where the memory is used for storing instructions and data, and the communication interface is used for communicating the apparatus with other devices For communication, for example, the communication interface may be a transceiver, a circuit, a bus, a module or other types of communication interfaces. When the communication device is applied to a terminal device, the other device may be an access network device. When the communication apparatus is applied to an access network device, the other device may be a terminal device.

When the communication apparatus is applied to a terminal device, the processor is configured to implement the method described in the first aspect or the third aspect, and when the communication apparatus is applied to an access network device, the processor is configured to implement the above-mentioned first aspect The method described in the second aspect or the fourth aspect.

In a seventh aspect, an embodiment of the present application provides a communication system, including a terminal device and an access network device, wherein the terminal device has a function of executing the method provided in the first aspect or the third aspect of the present application, and the connection The network access device has the function of executing the method provided by the second aspect or the fourth aspect of the present application.

In an eighth aspect, an embodiment of the present application further provides a computer program, which, when the computer program runs on a computer, causes the computer to execute the method provided in any one of the foregoing aspects.

In a ninth aspect, an embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a computer, the computer is made to execute any one of the above methods provided.

In a tenth aspect, an embodiment of the present application further provides a chip, where the chip is configured to read a computer program stored in a memory, and execute the method provided in any of the foregoing aspects.

In an eleventh aspect, an embodiment of the present application further provides a chip system, where the chip system includes a processor for supporting a computer device to implement the method provided in any one of the foregoing aspects. In a possible design, the chip system further includes a memory for storing necessary programs and data of the computer device. The chip system can be composed of chips, and can also include chips and other discrete devices.

Description of drawings

FIG. 1 is a schematic diagram of a communication system architecture provided by an embodiment of the present application;

Fig. 2 is an example diagram of terminal equipment performing RRC state transition;

Fig. 3 is a flow chart of a small packet data transmission method based on a two-step random access process;

4 is a flowchart of a small packet data transmission method based on a four-step random access process;

Fig. 5 is the flow chart of the preconfigured authorization packet transmission method based on authorization-free scheduling;

6 is a flowchart of a data transmission method when a terminal device performs CG-SDT according to an embodiment of the present application;

Fig. 7 is the flow chart of the data transmission method that this application example 1 provides;

Fig. 8 is the flow chart of the data transmission method that this application example 2 provides;

9 is a flowchart of a data transmission method provided by Example 3 of this application;

10 is a flowchart of a data transmission method provided by Example 4 of this application;

11 is a flowchart of a data transmission method provided by Example 5 of this application;

12 is a flowchart of a data transmission method provided by Example 6 of this application;

13 is a flowchart of a data transmission method provided by Example 7 of this application;

14 is a flowchart of the data transmission method provided by Example 8 of this application;

15 is a flowchart of a data transmission method provided by Example 9 of this application;

16 is a flowchart of a data transmission mode when a terminal device performs RA-SDT according to an embodiment of the present application;

17 is a schematic diagram of the correspondence between a first field value and its corresponding SSB index value and a CG resource according to an embodiment of the present application;

FIG. 18 is a schematic diagram of a correspondence between an SSB index value and a CG resource according to an embodiment of the present application;

19 is a flowchart of a data transmission method when a terminal device according to an embodiment of the present application performs 4-step RA-SDT;

20 is a flowchart of a data transmission method when a terminal device according to an embodiment of the present application performs 2-step RA-SDT;

21 is a flowchart of a data transmission method when a random access process provided by an embodiment of the present application ends and the terminal device has not switched from an RRC inactive state to an RRC connected state;

FIG. 22 is a schematic structural diagram of a communication device according to an embodiment of the present application;

FIG. 23 is a schematic structural diagram of a communication apparatus according to an embodiment of the present application.

Detailed ways

The embodiments of the present application may be applied to a 5G system or a future mobile communication system.

The embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

As shown in FIG. 1 , an embodiment of the present application provides a communication system architecture, where the communication system includes at least one terminal device and a network device, and the network device may include an access network device ( RAN equipment) and core network equipment in the core network.

The terminal equipment in the communication system shown in FIG. 1 may also be called user equipment (UE), mobile station (MS), mobile terminal (MT), etc., and is a part of the user side. An entity for receiving or transmitting signals, for sending uplink signals to network equipment, or receiving downlink signals from network equipment. Includes devices that provide voice and/or data connectivity to users.

For example, the terminal device may be a handheld device with wireless connectivity, or a processing device connected to a wireless modem. The terminal equipment may communicate with the core network via a radio access network (RAN), and exchange voice and/or data with the RAN. The terminal equipment may include user equipment, V2X terminal equipment, wireless terminal equipment, mobile terminal equipment, device-to-device (D2D) terminal equipment, machine-to-machine/machine-type communication (machine-to-machine/ machine-type communications, M2M/MTC) terminal equipment, Internet of things (IoT) terminal equipment, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile station), remote station (remote station) ), access point (AP), remote terminal (remote terminal), access terminal (access terminal), user terminal (user terminal), user agent (user agent), or user device (user device), available Wearable devices, in-vehicle devices, etc.

As an example and not a limitation, in this embodiment of the present application, the terminal device may also be a wearable device. Wearable devices can also be called wearable smart devices or smart wearable devices, etc. It is a general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes. Wait. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction, and cloud interaction. In a broad sense, wearable smart devices include full-featured, large-scale, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, which needs to cooperate with other devices such as smart phones. Use, such as all kinds of smart bracelets, smart helmets, smart jewelry, etc. for physical sign monitoring.

The various terminal devices described above, if they are located on the vehicle (for example, placed in the vehicle or installed in the vehicle), can be considered as on-board terminal equipment, and the on-board terminal equipment can also be called on-board unit (on-board unit, OBU). ).

The core network equipment in the communication system shown in FIG. 1 is a network element located in the core network and is used to implement the functions of the core network, for example, it is responsible for sending the terminal equipment to the terminal according to the call request or service request sent by the terminal equipment through the access network. The device is connected to different data networks, as well as services such as billing, mobility management, and session management. The core network may include multiple core network devices. For example, the core network includes core network devices responsible for terminal device access and mobility management service functions, core network devices responsible for session management, and the like.

Exemplarily, in a 5G mobile communication system, it may include: an access and mobility management function (access and mobility management function, AMF) network element, a session management function (session management function, SMF) network element, a user plane function ( core network equipment such as user plane function, UPF) network elements. The AMF network element may be responsible for terminal access management and mobility management; the SMF network element may be responsible for session management, such as user session establishment, etc.; the UPF network element may be a user plane functional entity, mainly Responsible for connecting to external networks. It should be noted that in this application, network elements may also be referred to as entities or functional entities, for example, AMF network elements may also be referred to as AMF entities or AMF functional entities, and, for example, SMF network elements may also be referred to as SMF entities or SMF functions entity etc.

The access network device in the communication system shown in FIG. 1 may be, for example, a base station (base station, BS), and the BS may be a device deployed in a wireless access network and capable of wirelessly communicating with terminal devices. The base station may have various forms, such as a macro base station, a micro base station, a relay station, and an access point. Exemplarily, the base station involved in the embodiments of the present application may be a base station in a 5G mobile communication system or a base station in an LTE mobile communication system, where the base station in the 5G mobile communication system may also be referred to as a transmission reception point (transmission reception point). , TRP) or gNB.

It should also be noted that, in this embodiment of the present application, the device for implementing the function of the network device may be a network device; it may also be a device capable of supporting the network device to realize the function, such as a chip system, and the device may be installed on the network in the device.

The technical solutions provided in the embodiments of the present application can be applied to wireless communication between communication devices. Specifically, it may include: wireless communication between a network device and a terminal device, wireless communication between a network device and a network device, and wireless communication between a terminal device and a terminal device. Wherein, in this embodiment of the present application, the term "wireless communication" may also be referred to as "communication" for short, and the term "communication" may also be described as "data transmission", "information transmission" or "transmission". It should be noted that "data transmission" in the embodiments of this application may be small data packet (small data, SD) transmission, or may be data transmission with unlimited data size. Unless otherwise specified, "data transmission" in the embodiments of this application "Data transfer" means small packet transfer.

Among them, the small data packet can be a data packet with a size of 100-300Byte; or, a small data packet is a data packet that can be sent in one time slot, taking 5M bandwidth resources and a time slot of 30kHz SCS as an example, if a positive If quadrature phase shift keying (QPSK) is used for modulation, about 500 bytes can be transmitted in one time slot; or the user plane data packets and/or control plane sent when the RRC state of the terminal device is RRC inactive Data packets can be considered as small data packets. It should be noted that the small data packet may also be referred to as small packet data or small packet, and the small data packet transmission may also be referred to as small packet data transmission.

In the communication system shown in FIG. 1 , the terminal device is within the coverage of an access network device, and the terminal device can communicate with the access network device after accessing the access network device. Specifically, the terminal device communicates with the access network device. The device sends an uplink signal, and/or receives a downlink signal sent by the access network device. The terminal device can achieve synchronization with the access network device and obtain system messages by receiving a synchronization signal block (synchronization signal and PBCH block, SSB). Among them, a primary synchronization signal (primary synchronisation signal, PSS), a secondary synchronization signal (secondary synchronisation signal, SSS) and a physical broadcast channel (physical broadcast channel, PBCH) together constitute an SSB. An SSB cycle sent by the access network device includes multiple SSBs, each SSB corresponds to a beam, and the terminal device can select the SSB with the best or better signal quality according to the beam scanning signal. Wherein, multiple SSBs may correspond to the same beam or respectively correspond to different beams.

During the process of accessing the access network device or after the terminal device accesses the access network device, it can perform a radio resource control (RRC) establishment process with the access network device. After the RRC connection is established between the two, the RRC state of the terminal device is the RRC connected state, and then the RRC state of the terminal device can be converted in the following states: RRC idle (RRC_IDLE) state, RRC connected (RRC_CONNECTED) state and RRC inactive (RRC_INACTIVE) state )state.

The three RRC states of the terminal device are further introduced below:

1. RRC connection state

When the RRC state of the terminal device is in the connected state, there is an RRC connection between the terminal device and the access network device. The scheduler (grant-free, GF) communicates with the access network equipment. Specifically, the terminal device may send specific data of the terminal device or unicast data of the terminal device to the access network device through an uplink data channel, such as a physical uplink shared channel (PUSCH), and/or, The terminal device may receive specific data of the terminal device or unicast data of the terminal device from the access network device through a downlink data channel, such as a physical downlink shared channel (PDSCH).

2. RRC idle state

When the RRC state of the terminal device is in the idle state, the RRC connection between the terminal device and the access network device is released, and the connection between the terminal device and the core network device is released, and the terminal device can receive broadcast messages from the access network device. , paging messages, system messages, etc., but the terminal equipment cannot perform unicast data transmission with the access network equipment. For example, the terminal equipment cannot receive the downlink data sent by the access network equipment through the specific PDSCH of the terminal equipment, and the terminal equipment cannot pass The terminal device-specific PUSCH sends uplink data to the access network device.

3. RRC inactive state

When the RRC state of the terminal device is inactive state, the RRC connection between the terminal device and the access network device is released, but the connection between the terminal device and the core network device can be maintained. The terminal device can receive broadcast messages, paging messages, system messages, etc. from the access network device, and can also perform limited unicast data transmission with the access network device. For example, the terminal device can send unicast small packet data to the access network device. , and/or, receive unicast packet data sent by the access network device.

Figure 2 is an example diagram of the terminal equipment transitioning in the above-mentioned three RRC states. The RRC state transition includes the following transition processes:

1, RRC connected state → RRC idle state

Exemplarily, the access network equipment can send an RRC release (RRC rlease) message to the terminal equipment, so that the terminal equipment releases the RRC connection with the access network equipment, and releases the connection with the core network equipment, so that the terminal equipment releases the RRC connection with the access network equipment. Transition from RRC connected state to RRC idle state.

2, RRC connected state → RRC inactive state

Exemplarily, the access network device may send an RRC suspend (RRC suspend) message or an RRC release (RRC rlease) to the terminal device, so that the terminal device releases the RRC connection with the access network device, but keeps the connection with the core network device. The connection between the terminals makes the terminal equipment change from the RRC connected state to the RRC inactive state.

3. RRC idle state → RRC connected state

Exemplarily, the terminal equipment may establish an RRC connection with the access network equipment and establish a connection with the core network equipment through the RRC establishment process, so that the terminal equipment is converted from the RRC idle state to the RRC connected state. Wherein, the RRC establishment process may be triggered by the upper layer of the terminal device. For example, when the terminal device needs to send uplink data, the RRC establishment process is triggered by the higher layer of the terminal device. The RRC establishment process may also be triggered by the access network device. For example, when the terminal device is in the RRC idle state, the access network device sends a paging message to the terminal device, where the paging message includes the identifier of the terminal device. Correspondingly, after receiving the paging message from the access network device, the terminal device triggers the RRC establishment process.

Specifically, the RRC establishment process may include: the terminal device sends an RRC establishment request (RRC Connection Request) message to the access network device. Correspondingly, after the access network device receives the request message, if the access network device sends an RRC connection setup (RRC Connection setup) message to the terminal device, it means that the access network device agrees to the terminal device to access, then the terminal device's The RRC state may transition to the RRC connected state. If the access network device sends an RRC connection reject (RRC Connection reject) message to the terminal device, it means that the access network device rejects the access of the terminal device, and the RRC state of the terminal device continues to stay in the RRC idle state.

In the embodiment of the present application, the scenarios in which the high layer of the terminal device triggers the terminal device to initiate the RRC establishment process include but are not limited to: the terminal device needs to send uplink data to the access network device. Exemplarily, the service data adaptation protocol (service data adaptation protocol, SDAP) layer of the terminal device, the packet data convergence protocol (packet data convergence protocol, PDCP) layer, and/or the radio link control (radio link control, RLC) layer ) layer triggers the RRC layer of the terminal device and the access network device to perform the RRC establishment process, and the RRC layer of the terminal device triggers the media access control (media access control, MAC) layer of the terminal device and the access network device to perform the access process, thereby During the access process or after the access is completed, the RRC establishment process is performed with the access network device.

4. RRC inactive state → RRC connected state

Exemplarily, when the terminal device is in the RRC inactive state, the RRC connection between the terminal device and the access network device can be established or restored through the RRC establishment or RRC recovery process, so that the RRC state of the terminal device is converted to the RRC connected state.

When the terminal device is in the RRC inactive state, after the terminal device receives a paging message from the access network device, or after being triggered by the upper layer of the terminal device, the terminal device can initiate an RRC recovery process to try to recover the communication with the access network device. RRC connected to enter the RRC connected state. For example, the RRC recovery process between the terminal device and the access network device includes: the terminal device sends an RRC Resume Request (RRC Resume Request) message to the access network device, and after receiving the request, the access network device sends an RRC message to the terminal device A setup (RRC Setup) message or an RRC resume (RRC Resume) message, so that the state of the terminal device can be converted to the RRC connected state; or, the access network device sends an RRC Release (RRC Release) message to the terminal device, so that the state of the terminal device From the RRC inactive state to the RRC idle state; or, the access network device sends an RRC reject (RRC Reject) message to the terminal device, so that the terminal device continues to stay in the RRC inactive state.

5. RRC inactive state → RRC idle state

Exemplarily, when the terminal device is in the RRC inactive state, the connection between the terminal device and the core network device may be released through the RRC release process, so that the terminal device is converted from the RRC inactive state to the RRC idle state.

It should also be noted that, for the introduction of the RRC status of the terminal device, you can refer to Section 5.3 of the 3rd generation partnership project (3GPP) 5G standard protocol TS38.331 and the introduction of other relevant sections, but this application Embodiments are not so limited. For example, for the introduction of the RRC status of the terminal device, you can refer to 38.331 of various current versions, or 38.331 of various versions that may be developed in the future, or you can refer to other standard protocols, textbooks, conference documents, journals, etc. Describes the introduction of the RRC state of the terminal device.

According to the above content, when the terminal device is in the RRC inactive state, the terminal device can receive broadcast messages, paging messages, system messages, etc. from the access network device, and can also perform limited unicast data transmission with the access network device. When the access network equipment retains the registration information of the terminal equipment, but the terminal equipment suspends most of the air interface behaviors with the access network equipment, such as suspending monitoring scheduling information, that is, suspending receiving the information sent by the access network equipment for scheduling the The physical downlink control channel (PDCCH) of the terminal equipment for unicast transmission, suspension of sending scheduling information, suspension of RRM (radio resource management, radio resource management) measurement, suspension of beam maintenance and other air interface behaviors. It can be seen that compared with the RRC connected state, the RRC inactive state is a state that saves the power of the terminal device, and compared with the RRC idle state, the terminal device can quickly switch to the RRC connected state in the RRC inactive state, which significantly reduces the power consumption. Delay and signaling overhead of switching to RRC connected state.

Before the Release 16 standard of 3GPP, terminal equipment in the RRC inactive state did not support unicast data transmission, that is, the terminal equipment needed to restore the RRC connection and enter the RRC connected state before unicast data transmission. However, there are some business scenarios in which the terminal device needs to transmit small data packets, such as smartphone-related services, which may be instant messages in instant messaging applications, heartbeat packets or push messages of applications; for example, non-smartphone-related services , such as periodic data from wearable devices (such as heartbeat packets), periodic readings sent by industrial wireless sensor networks, data transmission from smart meters, and more. In these scenarios, the signaling required for the terminal device to enter the RRC connected state from the RRC inactive state may be larger than the data packets to be transmitted, resulting in unnecessary power consumption and signaling overhead. Therefore, when the terminal device is in the RRC inactive state, unicast small data transmission (SDT) can solve the communication requirements in these scenarios, while reducing signaling overhead and power consumption.

In the specific implementation, when the terminal device is in the RRC inactive state, the small packet data transmission can be performed in the following two ways:

1. Small packet data transmission based on random access process (random access channel-small data transmission, RA-SDT).

The random access process means that the terminal device establishes a wireless link with the access network device through the random access process to obtain or restore uplink synchronization. The small packet data transmission based on the random access process means that the terminal device sends uplink data to the access network device or receives the downlink data sent by the access network device during the random access process. The small packet data transmission based on the two-step random access process and the small packet data transmission based on the four-step random access process are described in detail below:

1. Small packet data transmission based on a two-step random access process.

Referring to the small packet data transmission method based on the two-step random access process shown in FIG. 3, it includes two steps of MsgA and MsgB:

MsgA: The terminal device sends a random access preamble (Preamble) to the access network device on the physical random access channel (PRACH), and the terminal device transmits the random access preamble (Preamble) on the corresponding physical uplink shared channel (physical uplink shared channel, PUSCH) to send uplink small packet data to the access network device.

The Preamble is used to determine the timing advance (TA) of the terminal device according to the Preamble after the access network device receives the Preamble, and notify the TA to the terminal device, so that the terminal device can adjust the uplink synchronization.

MsgB: The access network device sends a random access response (RAR) to the terminal device, and the RAR may include the feedback information of MsgA to notify the terminal device whether the access network device successfully receives the uplink small packet data.

It should be noted that PRACH resources, Preamble resources, PUSCH resources (including demodulation reference signal (DMRS) resources in PUSCH), and resources for terminal equipment to receive RAR are all configured by the access network equipment to the terminal equipment Specifically, it may be a resource dedicated to the terminal device configured by the access network device when the terminal device is in the RRC connection state, or it may be a resource that the access network device broadcasts for competition in the system message.

2. Small packet data transmission based on a four-step random access process.

The small packet data transmission based on the four-step random access process can also be called an early data transmission (EDT) scheme, which is different from the data transmission performed by the terminal device after entering the RRC connection state through the four-step random access process.

Referring to the small packet data transmission method based on the four-step random access process shown in FIG. 4, it includes the following four steps:

Msg1: The terminal device sends a Preamble to the access network device on a physical random access channel opportunity (PRACH occasion, RO).

Msg2: The access network device sends an RAR to the terminal device, where the RAR includes the uplink scheduling information of Msg3.

Msg3: The terminal device sends uplink small packet data to the access network device on the resource scheduled by the RAR. Optionally, the uplink small packet data may include the identifier of the terminal device.

Msg4: The access network device sends feedback information to the terminal device, so as to notify the terminal device of whether the access network device successfully receives the uplink small packet data.

Among them, PRACH resources, Preamble resources, PUSCH resources (including DMRS resources in PUSCH), and resources for the terminal equipment to receive RAR are all configured by the access network equipment to the terminal equipment. Specifically, the access network equipment may be in the terminal equipment. The resources allocated to the terminal equipment in the RRC connection state may also be resources that the access network equipment broadcasts and competes for in the system message.

2. Pre-configured grant-small data transmission (CG-SDT) based on grant-free scheduling (GF).

CG-SDT refers to the PUSCH resources and corresponding transmission parameters pre-configured by the access network equipment for the terminal equipment for uplink data transmission in a semi-static manner, so that the terminal equipment can directly use the uplink data when there is uplink data to transmit. The preconfigured PUSCH resources and corresponding transmission parameters send uplink data to the access network device without receiving the dynamic uplink grant (dynamic UL grant) of the access network device, and do not need to send the Preamble to the access network device to enable The terminal equipment adjusts the uplink synchronization.

The preconfigured authorization transmission includes two types of preconfigured authorization methods (Type 1CG and Type 2CG). Among them, the data transmission based on Type 1CG is that the access network equipment configures the terminal equipment with pre-configured grant (CG) resources and transmission parameters through RRC signaling. For example, the access network equipment configures the following information or resources for the terminal equipment. One or more of: time-domain resource period, open-loop power control related parameters, waveform, redundancy version sequence, number of repetitions, frequency hopping mode, resource allocation type, hybrid automatic repeat request (HARQ) Number of processes, DMRS-related parameters, modulation and coding scheme, resource block group (RBG) group size, time domain resources, frequency domain resources, modulation and coding scheme (MCS), etc.

In the transmission based on Type 2CG, the access network device adopts a two-step resource configuration method: first, the access network device issues authorization configuration information through RRC signaling. The authorization configuration information is used to configure CG resources and transmission parameters, which may include Period of time domain resources, related parameters of open-loop power control, waveform, redundancy version sequence, number of repetitions, frequency hopping mode, resource allocation type, number of HARQ processes, DMRS related parameters, MCS table, RBG group size, etc. Then the access network device sends downlink control information (DCI) scrambled using the configured scheduling radio network temporary identifier (CS-RNTI) to the terminal device to activate Type 2CG-based PUSCH transmission , and configure other transmission resources and transmission parameters including time domain resources, frequency domain resources, DMRS sequence indication, MCS, etc. at the same time.

Figure 5 shows a CG-SDT method, including the following steps:

S501: The terminal device sends the uplink small packet data to the access network device by using the CG resource; optionally, the uplink small packet data may include the identifier of the terminal device.

S502: The access network device sends feedback information to the terminal device, where the feedback information is used to notify the terminal device whether the access network device successfully receives the uplink small packet data.

It can be seen from the above introduction that when the terminal device is in the RRC inactive state, it can send small packets of data through RA-SDT or CG-SDT, but the terminal device needs to determine whether the CG resource is valid before using the CG resource for CG-SDT. For example , when the terminal device determines that the TA is valid, and the terminal device determines that the measured reference signal received power (RSRP) of the SSB is within a preset threshold range, it determines that the CG resource is valid. When the terminal device determines that all conditions for valid CG resources cannot be met, the terminal device cannot perform CG-SDT, but needs to perform RA-SDT, or perform data transmission after returning to the RRC connection state through the random access procedure.

In addition, if the terminal equipment needs to switch to CG-SDT when performing RA-SDT, the terminal equipment needs to enter the RRC connection state through the random access process, obtain the CG resources reconfigured by the access network equipment, and switch to the CG-SDT After the RRC is inactive, the CG-SDT can be continued, which takes a long time and costs a lot. It can be seen that the current small packet data transmission method is not flexible enough.

Based on the above problems, the embodiments of the present application provide a data transmission method for an access network device to instruct the terminal device to continue data transmission during the small packet data transmission process of the terminal device, so as to improve the flexibility of small packet data transmission.

The following describes the data transmission modes of the terminal equipment provided in the embodiments of the present application in the case of CG-SDT or RA-SDT two kinds of small packet data transmission:

1. The data transmission method when the terminal equipment performs CG-SDT.

FIG. 6 shows a data transmission method according to an embodiment of the present application, including the following steps:

S601: When the terminal device is in the RRC inactive state, the terminal device sends the first data to the access network device by using preconfigured authorization resources. The access network device receives the first data sent by the terminal device in the RRC inactive state through the preconfigured authorization resource.

Optionally, the preconfigured grant (CG) resource may be a resource preconfigured by the access network device for the terminal device to perform uplink data transmission in a semi-static manner when the terminal device is in the RRC connection state, such as using PUSCH resources for uplink data transmission and corresponding transmission parameters.

S602: The access network device sends transmission indication information to the terminal device, where the transmission indication information is used to instruct the terminal device to switch the data transmission mode or continue data transmission.

Optionally, the access network device sends downlink control information (downlink control information, DCI) to the terminal device, and the DCI includes transmission indication information. The DCI may be a DCI scrambled by a radio network temporary indicator (RNTI) dedicated to the inactive CG-SDT configured to the terminal device by the access network device, and the access network device is configured to the terminal device The RNTI dedicated to CG-SDT can be either SDT-RNTI or CG-RNTI.

The transmission indication information is used to instruct the terminal device to switch the data transmission mode or continue the data transmission. In a specific implementation, the transmission indication information may include at least one of a power control indication, a transmission mode switching indication, a correct response response to the first data, a timing advance adjustment indication, PUSCH scheduling information, PDSCH scheduling information, and modulation and coding adjustment indications . The power control instruction is used to instruct the terminal device to send the transmission power of the second data, the transmission mode switching instruction is used to instruct the terminal device to switch the data transmission mode, and the correct response of the first data is used to instruct the access network device to successfully receive the first data. One data, the timing advance adjustment indication is also called the TA adjustment indication, the TA adjustment indication is used to instruct the terminal device to adjust the TA, and the PUSCH scheduling information is used to indicate the scheduled PUSCH. To send uplink data, the PDSCH scheduling information is used to indicate the scheduled PDSCH, and the terminal device can receive the downlink data sent by the access network device on the scheduled PDSCH. The modulation and coding adjustment instruction is also called the MCS adjustment instruction, and the MCS adjustment instruction is used to instruct the terminal device to adjust the MCS.

In an optional implementation manner, the Format0_0 of DCI is used to implement the transmission mode switching indication, the correct acknowledgement response of the first data, and the PUSCH scheduling information in the transmission indication information. Specifically, when the value of the frequency domain resource allocation (FDRA) field in the DCI of Format0_0 is "all 1", it means that the transmission instruction information includes the transmission mode switching instruction and/or the correct response response of the first data, When the value of the FDRA field in the DCI of Format0_0 is not "all 1", it indicates that the transmission indication information includes PUSCH scheduling information. In addition, the indication of the PDSCH scheduling information in the transmission indication information is implemented using the DCI of Format1_0 of the DCI.

Optionally, when the value of the FDRA field in the DCI of Format0_0 is different, it can be used to indicate different transmission indication information. For example, when the value of the FDRA field in Format0_0 is "all 1", as shown in Table 1, 1 bit in the transmission indication information can be occupied to distinguish the transmission mode switching indication or the correct response response of the first data:

Table 1

比特值bit value	指示内容Instruction content
00	传输方式切换指示Transmission mode switching indication
11	第一数据的正确应答响应Correct acknowledgment response for the first data

For another example, as shown in Table 2, 2 bits in the transmission indication information can be occupied to distinguish the transmission mode switching indication or the correct response response of the first data:

Table 2

Optionally, the DCI of Format 0_0 may be used to implement the indication power control indication, the TA adjustment indication and the MCS adjustment indication included in the transmission indication information. As an example, the indication content included when the DCI of Format0_0 is used to send the transmission indication information and the number of bits occupied are shown in Table 3:

table 3

The following describes each indication content included in the transmission indication information:

1. Power control indication.

The power control indication is used to instruct the terminal device to send the second data transmission power. Optionally, when the terminal device sends the second data, it can continue the current CG-SDT for the terminal device and send the second data on the next CG resource, such as the terminal device. The device sends the second data through PUSCH; or the second data sent by the terminal device may be that after the terminal device switches to RACH or RA-SDT, the second data is sent on the random access resource, for example, the terminal device sends the second data through PRACH or PUSCH , the power control indication may be a PUSCH power control indication and/or a PRACH power control indication.

Optionally, the power control indication may be carried in the first field of the transmission indication information, and different values of the first field are used to indicate different transmit powers.

In an optional implementation manner, the power control indication is used to instruct the terminal device to transmit the power when sending the second data, for example, the first field occupies N bits of the transmission indication information, and different values of the first field indicate different transmit powers. value.

In another optional implementation manner, the power control indication is used to indicate the power offset of the transmit power when the terminal device sends the second data relative to the transmit power when the terminal device sends the first data, then the terminal device receives After the indication information is transmitted, the transmit power used for transmitting the second data may be determined according to the power control indication in the transmission indication information and the transmit power for transmitting the first data.

As an example, the first field occupies 2 bits in the transmission indication information, and different values of the first field are used to indicate the power of the transmit power when the terminal device sends the second data relative to the transmit power when the terminal device sends the first data Offset. For example, Table 4 shows a different value of the first field and its corresponding power offset.

Table 4

第一字段(2bits)The first field (2bits)	功率偏移量(dB)Power offset (dB)
0000	-1-1
0101	00
1010	11
1111	33

2. Transmission mode switching instruction.

The transmission mode switching instruction is used to instruct the terminal device to switch from the current CG-SDT to the target data transmission mode, and to continue data transmission through the target data transmission mode.

In an optional embodiment, the transmission mode switching instruction includes an identifier and/or a power threshold of the target data transmission mode, wherein the identifier of the target data transmission mode is used to indicate the type of the target data transmission mode, and the target data transmission mode is carried in the In the second field of the transmission indication information, different values of the second field are used to indicate different data transmission modes; the power threshold is the RSRP threshold, and the power threshold is carried in the third field of the transmission indication information. After receiving the identification and/or power threshold of the target data transmission mode in the transmission indication information, the terminal device may determine the target data transmission mode to switch to according to the identification and/or power threshold of the target data transmission mode.

As an example, the second field occupies 2 bits in the transmission indication information, and different values of the second field represent identifiers of different target data transmission modes. For example, Table 5 shows a different value of the second field and the identifier of the corresponding target data transmission mode.

table 5

第二字段(2bits)The second field (2bits)	目标数据传输方式的标识Identification of the target data transfer method
0000	2-step RACH2-step RACH
0101	4-step RACH4-step RACH
1010	2-step RA-SDT2-step RA-SDT
1111	4-step RA-SDT4-step RA-SDT

In the above Table 5, 2-step RACH is the identifier corresponding to the two-step random access process, which is used to instruct the terminal device to recover from the RRC inactive state to the RRC connected state through the two-step random access process; 4-step RACH is a four-step The identifier corresponding to the random access process is used to instruct the terminal equipment to recover from the RRC inactive state to the RRC connected state through the four-step random access process; 2-step RA-SDT is the identifier corresponding to the two-step random access data transmission, which is used It is used to instruct the terminal device to transmit small packet data through the two-step random access process; 4-step RA-SDT is the identifier corresponding to the four-step random access data transmission, which is used to instruct the terminal device to perform small packet data transmission through the four-step random access process. .

In another example, the second field occupies 1 bit in the transmission indication information, and different values of the second field represent identifiers of different target data transmission modes. Optionally, the second field is used to indicate whether the terminal device performs data transmission through the random access process. For example, Table 6 shows the value of the second field and the identifier of the corresponding target data transmission mode.

Table 6

第二字段(1bits)The second field (1bits)	目标数据传输方式的标识Identification of the target data transfer method
00	RACH RACH
11	RA-SDTRA-SDT

In the above Table 6, RACH is the identifier corresponding to the random access process, which is used to instruct the terminal equipment to recover from the RRC inactive state to the RRC connected state through the random access process; RA-SDT is the identifier corresponding to the random access data transmission, which is used It is used to instruct the terminal equipment to perform small packet data transmission through the random access procedure.

In an optional implementation manner, the power threshold in the handover instruction is carried in a third field in the transmission instruction information, and the third field occupies X bits in the transmission instruction information, where X is a positive integer greater than 0. When judging whether to use a two-step random access process or a four-step random access process according to the power threshold, the terminal device may specifically perform the following operations: the terminal device determines the RSRP, and compares the RSRP with the power threshold: if the RSRP is greater than the power threshold, the terminal device determines A two-step random access procedure is adopted, otherwise, the terminal device determines to adopt a four-step random access procedure.

It can be understood that the identifier of the target data transmission mode in the transmission mode switching instruction can be used to indicate whether the terminal device performs small-packet data transmission through the random access process and whether to use the two-step random access process or the four-step random access process, and also It can be used to indicate whether the terminal device performs small packet data transmission through the random access process, and the two-step random access process or the four-step random access process can be selected by the terminal device, or the terminal device can compare the RSRP with the switching instruction. The power threshold is determined. Specifically, when the transmission mode switching instruction includes the identification of the target data transmission mode, the terminal device continues data transmission according to the identification of the target data transmission mode. When the identifier of the target data transmission mode does not indicate that the terminal device adopts the two-step random access procedure or the four-step random access procedure, if the handover instruction includes a power threshold, the terminal device determines that the terminal device adopts the two-step random access according to the power threshold. The process is still a four-step random access process. If the transmission mode switching instruction does not include a power threshold, the terminal device can choose to use a two-step random access process or a four-step random access process.

Optionally, the transmission indication information may also include a contention-free random access resource indication, and a contention-free random access (CFRA) resource is used by the terminal device in the process of performing non-contention-based random access. Resources.

In an optional implementation manner, the contention-free random access resource indication may include a random access preamble index value (Preamble Index), a synchronization signal block index value (SSB Index), a physical random access channel opportunity (PRACH opportunity). , RO) at least one of a resource index value or a range of RO resource index values. Among them, the Preamble Index can be carried in the fourth field of the transmission indication information to indicate the Preamble used by the terminal equipment in the random access process; the SSB Index can be carried in the fifth field of the transmission indication information, used to indicate and RO Associated SSB; RO resource index value or RO resource index value range can be indicated by PRACH MASK Index, PRACH MASK Index can be carried in the sixth field of the transmission indication information, and different sixth field values can be used to indicate different ROs Resource index value or RO resource index value range.

Optionally, the contention-free random access resource indication may also include a physical uplink shared channel opportunity (PUSCH occasion, PO) indication, specifically, the PO indication may be a PO index value (PO Index), and the PO Index is used to indicate the terminal equipment. The PUSCH and PO Index used in the two-step random access process can be carried in the seventh field of the transmission indication information. In implementation, the number of bits occupied by the seventh field can be determined according to the number of candidate POs. For example, when there are 4 When there are two candidate POs, the seventh field may occupy 2 bits, and different values of the seventh field are used to indicate different candidate POs.

As an example, Table 7 shows a contention-free random access resource indication and the PO indication occupying the number of bits of transmission indication information.

Table 7

3. Correct response of the first data.

A correct acknowledgement response (acknowledge character, ACK) of the first data indicates that the access network device determines that it has received the first data sent by the terminal device.

In addition, the access network device may also send the correct response response of the first data to the terminal device in the following manner: the access network device sends RRC signaling to the terminal device, and the RRC signaling includes the correct response response of the first data; or The access network device sends a media access control (media access control, MAC) control element (control element, CE) to the terminal device, and the MAC CE includes a correct response response of the first data.

4. TA adjustment instructions.

The TA adjustment instruction is used to instruct the terminal device to perform TA adjustment. Optionally, the TA adjustment indication may be carried in the eighth field of the transmission indication information, and different values of the eighth field are used to identify different TA values.

In an optional embodiment, after the access network device measures the TA, it sends the measured target TA to the terminal device through a TA adjustment instruction, and the terminal device can adjust the TA currently used by the terminal device to the target TA, thereby completing the TA. Adjustment.

In another optional implementation manner, after the access network device measures the TA, it sends the measured TA offset of the target TA relative to the TA last indicated to the terminal device by the access network device through TA adjustment to the The terminal equipment, after receiving the transmission indication information including the TA adjustment indication, determines the target TA value according to the TA offset in the transmission indication information and the TA value currently used by the terminal equipment, and adjusts the TA used by the terminal equipment to target TA. It should be noted that the TA indicated to the terminal device by the access network device last time is the same as the TA currently used by the terminal device.

Optionally, when the transmission instruction information includes a transmission mode switching instruction, the terminal device switches from the current CG-SDT to the random access process, because the terminal device can obtain TA from the access network device through the random access process and perform TA. adjustment, the terminal equipment does not need to be instructed by the access network equipment to perform TA adjustment when switching to the random access procedure. Therefore, the eighth field occupied by the TA adjustment indication can be the same as the second field or the third field occupied by the transmission mode switching indication, and in the implementation, the transmission mode switching indication or TA adjustment indication in different scenarios can be realized by multiplexing the same field, For example, when the transmission instruction information includes a transmission mode switching instruction, the second field of the occupied transmission instruction information carries the identifier of the target data transmission mode; when the transmission instruction information does not include the transmission mode instruction, the second field of the occupied transmission instruction information carries TA adjustment instructions.

5. PUSCH scheduling information.

The PUSCH scheduling information is used to indicate the PUSCH scheduled by the access network device for the terminal device to send uplink data, and the terminal device can send the second data to the access network device on the PUSCH.

Optionally, the PUSCH scheduling information may be retransmitted PUSCH scheduling information or newly transmitted PUSCH scheduling information, wherein the retransmitted PUSCH scheduling information is used to instruct the terminal device to resend the first data on the scheduled PUSCH, and the newly transmitted PUSCH scheduling indication information It is used to instruct the terminal device to send the second data on the scheduled PUSCH.

In an optional embodiment, the PUSCH scheduling information may include at least one of the following: a frequency domain resource allocation (FDRA) indication required for PUSCH scheduling, a time domain resource allocation (TDRA) indication, MCS index value, HARQ process number (HARQ process number) related to PUSCH scheduling, and new data indicator (NDI). For example, the number of bits occupied by the above items in the transmission indication information is shown in Table 8:

Table 8

in,

Indicates the number of resource blocks (resourceblocks, RBs) in the currently activated (or available) downlink bandwidth part (bandwidth Part, BWP).

The HARQ process number and the new data indication in the PUSCH scheduling information can be used to indicate whether the PUSCH scheduling information is retransmission PUSCH scheduling information or newly transmitted PUSCH scheduling information. Optionally, determine whether the PUSCH scheduling information is retransmission PUSCH scheduling information or retransmission Newly transmitted PUSCH scheduling information:

1. When the HARQ process number is an unused HRAQ process number, or when the HARQ process number is a used HARQ process number and the new data indication is "rollover", determine that the PUSCH scheduling information is the newly transmitted PUSCH scheduling information.

2. When the HARQ process ID is the used HARQ process ID and the new data indication is "no rollover", determine that the PUSCH scheduling information is the retransmission PUSCH scheduling information.

It should be noted that if the HARQ process number is an unused HARQ process number, it means that data has not been transmitted on the process corresponding to the HARQ process number, and if the HARQ process number is a used HARQ process number, it means that the process corresponding to the HARQ process number has been transmitted. For example, the HARQ process number corresponding to the process in which the terminal device sends the first data is the used HARQ process number.

6. PDSCH scheduling information.

The PDSCH scheduling information is used to indicate the PDSCH scheduled by the access network device and used for sending downlink data to the terminal device, and the terminal device may receive third data sent by the access network device on the PDSCH.

Optionally, the third data may be downlink data sent by the access network device or higher layer feedback information (such as feedback information sent through RRC signaling or MAC CE).

After receiving the third data sent by the access network device through the scheduled PDSCH, the terminal device may send feedback information corresponding to the PDSCH to the access network device to notify the access network device whether the terminal device has received the third data. Optionally, the transmission indication information may further include a feedback power control indication, where the feedback power control indication is used to instruct the terminal device to transmit the transmit power of the feedback information corresponding to the PDSCH. The feedback power control indication is carried in the eighth field of the transmission indication information, and when the value of the eighth field is different, the feedback power control indication is used to indicate different transmit powers.

In a possible implementation manner, the eighth field occupies 2 bits of the transmission indication information, and the different values of the eighth field are used to indicate that the transmit power when the terminal device sends the feedback information is relative to the transmit power when the terminal device sent uplink data last time. power offset. For a specific indication manner, reference may be made to the introduction to the power control indication in the embodiment of the present application, and repeated descriptions are not repeated here.

7. MCS adjustment instructions.

The MCS adjustment instruction is used to instruct the terminal equipment to adjust the modulation and coding strategy. The MCS adjustment indication may be carried in the tenth field of the transmission indication information.

Optionally, the MCS adjustment indication can be used to indicate the MCS index value. The MCS index value corresponds to a row of MCS configuration information in the MCS table. terminal equipment. Each row of MCS configuration information in the MCS table includes at least one of channel coding code rate, quadrature amplitude modulation (quadrature amplitude modulation, QAM) order, and spectral efficiency.

In an optional implementation manner, the tenth field occupies X bits of the transmission indication information, the MCS index value is determined according to the value of the tenth field, and the MCS index value corresponds to a row of MCS configuration information in the MCS table of 2 ^X rows, for example, the first row of MCS configuration information. The tenth field occupies 5 bits of the transmission indication information, and the MCS index value can be determined according to the value of the tenth field, and the MCS index value corresponds to a row of MCS configuration information in the MCS table of 32 rows.

In another optional implementation manner, the tenth field may occupy X bits of the transmission indication information, and is used to indicate the offset of the MCS index value of the target MCS index value relative to the original MCS index value, for example, the original MCS index value=10 , the tenth field occupies 3 bits of the transmission indication information, wherein the first bit in the tenth field is used to indicate a positive offset or a negative offset. When the value is "1", it indicates a positive offset, and the last two bits in the tenth field are used to indicate the offset. Assuming that the tenth field is "010", the offset of the MCS index value is determined to be -2 , determine that the target MCS index value corresponding to the MCS adjustment indication is 8, which corresponds to the MCS configuration information in the 8th row in the MCS table (the MCS index value starts from 1), or corresponds to the MCS configuration information in the 9th row in the MCS table (MCS configuration information The index value starts from 0).

It can be understood that MCS is used to indicate the modulation method and transport block size, and the channel coding rate and the QAM order affect the transport block size (transmit block size, TBS). When the preconfigured time-frequency resources do not change, adjust the MCS. It can be expressed to adjust TBS.

After receiving the transmission indication information, the terminal device executes S603 and/or S604:

S603: The terminal device sends the second data to the access network device according to the transmission indication information, and the access network device receives the second data sent by the terminal device.

S604: The access network device sends third data to the terminal device, and the terminal device receives the third data sent by the access network device according to the transmission indication information.

In a specific implementation, the terminal device determines the operation performed by the terminal device when it continues to perform data transmission according to the transmission indication information. The following describes the different operations performed by the terminal device when the transmission indication information includes different indication contents:

1. The transmission indication information includes a power control indication.

When the terminal device determines that the transmission indication information includes a power control indication, the terminal device determines the target transmission power indicated by the power control information according to the value of the first field in the transmission indication information, and the terminal device sends the first transmission power to the access network device according to the target transmission power. Two data.

Optionally, when the power control indication is used to instruct the terminal device to transmit the second data with respect to the power offset of the transmit power when the terminal device transmits the first data, the terminal device determines the power offset according to the power control indication. The target transmission power is determined according to the transmission power and the power offset when the terminal device sends the first data, and the target transmission power is used to send the first data to the access network device on the next CG resource of the CG resource for sending the first data. Send second data.

2. The transmission instruction information includes a handover instruction.

When the terminal device determines that the transmission instruction information includes a switching instruction, it determines the target data transmission mode corresponding to the switching instruction information, and sends the second data to the access network device after switching to the target transmission mode.

In a possible implementation, the handover instruction includes the identifier of the target data transmission mode, and the target data transmission mode may be two-step random access data transmission, two-step random access process, four-step random access data transmission, four-step random access data transmission random access procedure. It includes the following four situations:

a. When the terminal device determines that the identifier of the target transmission mode is an identifier corresponding to the two-step random access data transmission, the terminal device sends the second data to the access network device through the two-step random access process.

b. When the terminal device determines that the identifier of the target transmission mode is the identifier corresponding to the two-step random access process, after the terminal device recovers from the RRC inactive state to the RRC connected state through the two-step random access process, it sends a message to the access network device. Second data.

c. When the terminal device determines that the identifier of the target transmission mode is the identifier corresponding to the four-step random access data transmission, the terminal device sends the second data to the access network device through the four-step random access process.

d. When the terminal device determines that the identifier of the target transmission mode is the identifier corresponding to the four-step random access process, the terminal device sends a message to the access network device after recovering from the RRC inactive state to the RRC connected state through the four-step random access process. Second data.

In another implementation manner, the handover indication includes a power threshold, and the terminal device determines the power threshold according to the value of the third field in the transmission indication information. Optionally, when the number of bits available for the power threshold in the transmission indication information is limited, the access network device can configure multiple power thresholds to the terminal device through RRC signaling or system messages, and then pass the third bit in the transmission indication information. field instructs the terminal device to select one of multiple power thresholds. Then, after receiving the transmission indication information, the terminal device determines the power threshold indicated by the handover instruction according to the value of the third field and multiple power thresholds configured by the access network device. The specific implementation includes the following two situations:

a. When the terminal device determines that the received power of the reference signal is greater than the power threshold, the terminal device sends the second data to the access network device through the two-step random access process, or the terminal device recovers from the RRC inactive state to the RRC inactive state through the two-step random access process In the RRC connected state, the second data is sent to the access network device.

b. When the terminal device determines that the received power of the reference signal is less than or equal to the power threshold, the terminal device sends the second data to the access network device through the four-step random access process, or the terminal device changes from the RRC inactive state through the four-step random access process After returning to the RRC connected state, the second data is sent to the access network device.

In yet another embodiment, when the handover instruction includes the identifier of the target data transmission mode and the power threshold, the target data transmission mode includes the random access procedure and the random access data transmission. The terminal device determines the power threshold according to the value of the third field in the transmission indication information. The specific implementation includes the following four situations:

a. When the terminal device determines that the identifier of the target data transmission mode is the identifier corresponding to the random access data transmission, and the received power of the reference signal is greater than the power threshold, the terminal device sends the second data to the access network device through a two-step random access process .

b. When the terminal device determines that the identifier of the target data transmission mode is the identifier corresponding to the random access process, and the received power of the reference signal is greater than the power threshold, the terminal device recovers from the RRC inactive state to the RRC connected state through the two-step random access process Then, the second data is sent to the access network device.

c. When the terminal device determines that the identifier of the target data transmission mode is the identifier corresponding to the random access data transmission, and the received power of the reference signal is less than or equal to the power threshold, the terminal device sends the first random access process to the access network device through the four-step random access process. Two data.

d. When the terminal device determines that the identifier of the target data transmission mode is the identifier corresponding to the random access process, and the received power of the reference signal is less than or equal to the power threshold, the terminal device recovers from the RRC inactive state to the RRC through the four-step random access process After the connected state, the second data is sent to the access network device.

Optionally, if the transmission indication information includes a contention-free random access resource indication, the terminal device performs a two-step random access process or a four-step random access process on the resource indicated by the contention-free random access resource, such as , determine the corresponding random access preamble Preamble1 according to the random access preamble index value included in the contention-free random access resource indication, determine the SSB1 used in the random access process according to the synchronization signal block index value, and determine the SSB1 used in the random access process according to the RO resource index The value determines the RO resource 1 corresponding to the random access procedure. Then, the terminal device uses SSB1 to send Preamble1 to the access network device on RO resource 1 to trigger a two-step random access request or a four-step random access request.

For example, if the terminal device determines that the target data transmission mode corresponding to the handover instruction is two-step random access data transmission, the terminal device may perform the small packet data transmission based on the two-step random access process shown in FIG. 3 .

For another example, if the terminal device determines that the target data transmission mode corresponding to the handover instruction is four-step random access data transmission, the terminal device may perform the small packet data transmission based on the four-step random access process shown in FIG. 4 .

3. The transmission indication information includes the correct response response of the first data.

When the terminal device determines that the transmission indication information includes a correct response response of the first data, the terminal device sends the second data to the access network device through the process of sending the first data.

Optionally, if the terminal device determines that the transmission instruction information does not include a correct response response for the first data, the terminal device sends the second data to the access network device through the process of sending the first data; wherein the second data is the same as the first data. The first data is the same, or the second data and the first data have the same information bits, or the second data and the first data have the same valid information, or the second data information is a redundant version of the first data information. That is to say, when the terminal device determines that the transmission indication information does not include a correct response response of the first data, the process of sending the first data may be used to retransmit the first data.

4. The transmission indication information includes PDSCH scheduling information.

When the terminal device determines that the PDSCH scheduling information is included in the transmission indication information, the terminal device determines the PDSCH scheduled by the transmission indication information according to the PDSCH scheduling information, and receives third data on the PDSCH scheduled by the transmission indication information. The third data may be downlink data sent by the access network device, or high-level feedback information sent by the access network device (such as feedback information sent through RRC signaling or MAC CE).

Optionally, if the transmission indication information also includes the feedback power control indication, the terminal device determines the transmit power indicated by the feedback power control indication according to the value of the eighth field occupied by the feedback power control indication, and according to the feedback power control indication With the indicated transmission power, feedback information corresponding to the third data is sent to the access network device, so as to notify the access network device whether the device successfully receives the third data when the terminal is in use.

In addition, when the transmission instruction information does not include the correct response response and power control instruction of the first data, if the terminal equipment receives the information sent by the access network equipment through RRC signaling, it is used to instruct the terminal equipment to use the feedback power control instruction as the power control instruction. configuration information of the control instruction, the terminal device can determine the transmit power indicated by the feedback power control instruction according to the value of the eighth field, and send the second data to the access network device according to the transmit power indicated by the feedback power control.

5. The transmission indication information includes a scheduling retransmission indication.

When the terminal device determines that the transmission indication information includes a scheduling retransmission indication, it determines the scheduling retransmission resource indicated by the scheduling retransmission indication, and sends second data on the scheduling retransmission resource, where the second data is the same as the first data, Either the information bits of the second data and the first data are the same, or the valid information of the second data and the first data are the same, or the second data information is a redundant version of the first data information.

Through the above method, in the process of RRC inactive state, after sending the first data to the access network device through the CG resource, the terminal device can receive the transmission indication information sent by the access network device, and the terminal device can perform data transmission according to the transmission indication information Mode switching or continuing the current data transmission, flexible data transmission, avoiding resource waste caused by terminal equipment blindly trying to switch data transmission modes, and improving data transmission efficiency.

The data transmission method when the terminal equipment provided by this application performs CG-SDT will be further introduced below with several specific examples:

Example 1

Figure 7 shows the data transmission method provided by Example 1, which specifically includes the following steps:

S701: In the process of the RRC inactive state of the terminal device, the terminal device sends the first data to the access network device through the preconfigured authorization resource.

S702: The access network device sends transmission indication information to the terminal device, where the transmission indication information includes a correct response response of the first data and a power control indication.

S703: The terminal device determines the power offset according to the value of the first field occupied by the power control indication in the transmission indication information.

S704: The terminal device determines the target transmit power according to the power offset and the transmit power when the terminal device transmits the first data;

S705: The terminal device sends the second data to the access network device by using the target transmission power through the process of sending the first data.

In this example, the access network device can send the correct response response of the first data and the power control instruction to the terminal device through the transmission instruction information, and the terminal device can send the second data to the access network device according to the power control instruction, so that the terminal device can send the second data to the access network device. Closed-loop power control of data transmission with access network equipment, so that the terminal equipment can adjust the transmit power in time according to the power control instruction, avoid excessive transmission power waste energy consumption and increase interference, and avoid too low transmission power resulting in poor reception performance .

Example 2

Figure 8 shows the data transmission method provided by Example 2, which specifically includes the following steps:

S801: When the terminal device is in the RRC inactive state, the terminal device sends the first data to the access network device through the preconfigured authorization resource.

S802: The access network device sends transmission indication information to the terminal device, where the transmission indication information includes a transmission mode switching indication and a contention-free random access resource indication.

S803: The terminal device determines, according to the identifier of the target data transmission mode in the transmission mode switching instruction, that the target data transmission mode is four-step random access data transmission.

S804: The terminal device determines resources used in the four-step random access process according to the contention-free random access resource indication.

For specific implementation, reference may be made to the operations performed by the terminal device when there is no contention for the random access resource indication in the transmission indication information in the embodiment of the present application, and repeated details will not be repeated.

S805: The terminal device sends a Preamble to the access network device on the determined PRACH used in the four-step random access process.

S806: The access network device sends the RAR to the terminal device.

S807: The terminal device sends the second data to the access network device on the resource scheduled by the RAR.

S808: The access network device sends feedback information to the terminal device, so as to notify the terminal device of whether the access network device successfully receives the uplink small packet data.

For the specific implementation of S805-S808, reference may be made to the small packet data transmission method based on the four-step random access process shown in FIG.

In this example, the access network device sends the handover indication and the contention-free random access resource indication through the transmission indication information, and the terminal device can switch to the target data transmission mode according to the handover indication, and use the contention-free random access resource indication resources for data transmission, so that the terminal device can accurately determine the target data mode and switch, and avoid unnecessary resource overhead caused by the terminal device blindly trying other data transmission modes.

Example 3

Figure 9 shows the data transmission method provided by Example 3, which specifically includes the following steps:

S901: When the terminal device is in the RRC inactive state, the terminal device sends the first data to the access network device through the preconfigured authorization resource.

S902: The access network device sends transmission indication information to the terminal device, where the transmission indication information includes PDSCH scheduling information and feedback power control indication.

S903: The terminal device receives third data on the PDSCH scheduled by the PDSCH scheduling information.

S904: The terminal device sends feedback information corresponding to the third data to the access network device according to the transmission power indicated by the feedback power control.

In this example, the access network device sends PDSCH scheduling information to the terminal device, and the terminal device receives the third data on the scheduled PDSCH, so that the terminal device can receive downlink data sent by the access network device in the RRC inactive state, Realize the transmission of downlink small packet data or non-small packet data.

Example 4

Figure 10 shows the data transmission method provided by Example 4, which specifically includes the following steps:

S1001: When the terminal device is in the RRC inactive state, the terminal device sends first data to the access network device by using preconfigured authorization resources.

S1002: The access network device sends transmission indication information to the terminal device, where the transmission indication information includes PUSCH scheduling information.

S1003: The terminal device determines that the PUSCH scheduling information is retransmission PUSCH scheduling information according to the HARQ process number and the new data indication in the PUSCH scheduling information.

S1004: The terminal device sends the second data to the access network device on the PUSCH resource scheduled by the PUSCH scheduling information.

Wherein, the second data is the same as the first data, or the information bits of the second data and the first data are the same, or the valid information of the second data and the first data is the same, or the second data information is a kind of the first data information Redundant version.

In this example, the access network device sends the PUSCH scheduling information to the terminal device through the transmission indication information, and when the terminal device determines that the PUSCH scheduling information is retransmission PUSCH scheduling information according to the HARQ process number and the new data indication in the PUSCH scheduling information, it means If the access network device fails to receive the first data successfully, the terminal device retransmits the first data to the access network device, thereby improving the accuracy of data transmission.

Example 5

Figure 11 shows the data transmission method provided by Example 5, which specifically includes the following steps:

S1101: When the terminal device is in the RRC inactive state, the terminal device sends the first data to the access network device through the preconfigured authorization resource.

S1102: The access network device sends transmission indication information to the terminal device, where the transmission indication information includes PUSCH scheduling information.

S1103: The terminal device determines that the PUSCH scheduling information is newly transmitted PUSCH scheduling information according to the HARQ process number and the new data indication in the PUSCH scheduling information.

S1104: The terminal device sends the second data to the access network device on the PUSCH resource indicated by the PUSCH scheduling information.

In this example, the access network device sends the PUSCH scheduling information to the terminal device through the transmission indication information, and when the terminal device determines that the PUSCH scheduling information is newly transmitted PUSCH scheduling information according to the HARQ process number and the new data indication in the PUSCH scheduling information, the terminal The device may send the second data to the access network device on the PUSCH scheduled by the PUSCH scheduling information.

Example 6

Figure 12 shows the data transmission method provided by Example 6, which specifically includes the following steps:

S1201: When the terminal device is in the RRC inactive state, the terminal device sends the first data to the access network device through the preconfigured authorization resource.

S1202: The access network device sends transmission indication information to the terminal device, where the transmission indication information includes a correct response response of the first data, a power control indication, and PDSCH scheduling information.

S1203: The terminal device determines the power offset according to the value of the first field occupied by the power control indication in the transmission indication information.

S1204: The terminal device determines the target transmit power according to the power offset and the transmit power when the terminal device transmits the first data.

S1205: The terminal device sends the second data to the access network device by using the target transmission power through the process of sending the first data.

S1206: The terminal device receives third data on the PDSCH scheduled by the PDSCH scheduling information.

It should be noted that this embodiment of the present application does not limit the execution order of S1203 to S1205 and S1206. S1203 to S1205 may be executed first and then S1206 may be executed, or S1206 may be executed first and then S1203 to S1205 may be executed.

In this example, the access network device can send the correct response response of the first data, the power control indication and the PDSCH scheduling information through the transmission indication information, and the terminal device can continue to send the second data according to the power control information, and can send the second data in the PDSCH scheduling information The third data is received on the scheduled PDSCH to flexibly implement data transmission of the terminal equipment in the RRC inactive state process.

Example 7

Figure 13 shows the data transmission method provided by Example 7, which specifically includes the following steps:

S1301: When the terminal device is in the RRC inactive state, the terminal device sends the first data to the access network device through the preconfigured authorization resource.

S1302: The access network device sends transmission indication information to the terminal device, where the transmission indication information includes a transmission mode switching indication and a power control indication.

S1303: The terminal device determines, according to the transmission mode switching instruction in the transmission instruction information, that the target transmission mode is an identifier of four-step random access data transmission.

S1304: The terminal device determines the target transmission power according to the power control indication in the transmission indication information.

S1305: The terminal device sends a Preamble to the access network device on one RO according to the target transmit power.

S1306: The access network device sends the RAR to the terminal device.

S1307: The terminal device sends the second data to the access network device on the resource scheduled by the RAR.

S1308: The access network device sends feedback information to the terminal device, so as to notify the terminal device of whether the access network device successfully receives the uplink small packet data.

In this instance, the access network device may send transmission instruction information including a transmission mode switching instruction and a power control instruction to the terminal device, and the terminal device may switch to the target data transmission mode according to the transmission mode switching instruction, and switch to the target data transmission mode according to the power control instruction. The target transmit power of the target data transmission method is used for data transmission.

Example 8

Figure 14 shows the data transmission method provided by Example 8, which specifically includes the following steps:

S1401: When the terminal device is in the RRC inactive state, the terminal device sends the first data to the access network device through the preconfigured authorization resource.

S1402: The access network device sends transmission indication information to the terminal device, where the transmission indication information includes a correct response response of the first data and a TA adjustment indication.

S1403: The terminal device determines the target TA according to the TA adjustment instruction, and adjusts the TA of the terminal device as the target TA.

S1404: The terminal device sends the second data to the access network device through the process of sending the first data.

In this example, the access network device sends the correct response response of the first data and the TA adjustment instruction to the terminal device through the transmission instruction information, and the terminal device can adjust the TA according to the TA adjustment instruction, so as to maintain the validity of the TA, and then complete the uplink data transmission.

Example 9

Figure 15 shows the data transmission method provided by Example 9, which specifically includes the following steps:

S1501: When the terminal device is in the RRC inactive state, the terminal device sends the first data to the access network device through the preconfigured authorization resource.

S1502: The access network device sends transmission indication information to the terminal device, where the transmission indication information includes a correct response response of the first data and an MCS adjustment indication.

S1503: The terminal device determines the MCS index value according to the value of the tenth field of the MCS adjustment indication occupation in the transmission indication information.

S1504: The terminal device determines a row of MCS configuration information in the MCS table corresponding to the MCS index value according to the preconfigured MCS table and the MCS index value.

S1505: The terminal device adjusts the MCS according to the MCS configuration information.

S1506: The terminal device sends the second data to the access network device through the process of sending the first data.

2. The data transmission method when the terminal equipment performs RA-SDT.

FIG. 16 shows a data transmission method according to an embodiment of the present application, including the following steps:

S1601: In the process of the RRC inactive state, the terminal device sends a random access request to the access network device, and the access network device receives the random access request from the terminal device in the RRC inactive state process.

In a specific implementation, the terminal device sends a Preamble to the access network device on one RO, where the Preamble and the RO can be dedicated resources indicated by the access network device to the terminal device, for example, the access network device randomly accesses resources without contention Indicates dedicated resources indicated to terminal devices. Or the access network device indicates the public resource, and the terminal device selects the Preamble and RO used in the random access process of the terminal device from the public resources indicated by the access network device.

Preamble and RO can also be used to distinguish data transmission types. For example, the terminal device triggers a random access request through different Preamble and RO to notify the access network device of the data transmission type. Optionally, the data transmission type may include a two-step random access procedure, a four-step random access procedure, a two-step random access data transmission, and a four-step random access data transmission.

S1602: The access network device sends transmission indication information to the terminal device, where the transmission indication information is used to instruct the terminal device to perform data transmission methods and/or resources, and the terminal device receives the transmission indication information from the access network device.

In an optional implementation manner, the transmission indication information may include at least one of a transmission mode switching indication, a resource indication, and a beam indication. Wherein, the transmission mode switching instruction is used to instruct the terminal equipment to switch to the authorization-free scheduling data transmission after the random access process or the random access data transmission ends; the resource indication is used to instruct the terminal equipment to perform free The pre-configured grant resource when the authorization is scheduled for data transmission; the beam indication is used to indicate the corresponding relationship between the synchronization signal block and the pre-configured grant resource.

The following describes the indication contents that may be included in the transmission indication information:

1. Transmission mode switching instruction.

The transmission mode switching instruction is used to instruct the terminal device to use the pre-configured authorized resources to perform CG-SDT after the current random access process or random access data transmission ends.

Optionally, the transmission mode switching indication may be carried in the first field of the transmission indication information. For example, the first field occupies 1 bit of the transmission indication information. When the bit value of this bit is 1, it indicates that the terminal equipment is instructing the current After the RACH or RA-SDT ends, use the pre-configured authorized resources to perform CG-SDT. When the bit value of this bit is 0, it indicates that the terminal device is instructed not to perform CG-SDT after the current RACH or RA-SDT ends. .

2. Resource indication.

The resource indication is used to indicate the CG resource when the terminal device performs authorization-free scheduling data transmission. Optionally, the resource indication may be carried in the second field of the transmission indication information, wherein the second field has different values, so the The resource indication is used to indicate activation of different preconfigured authorized resources.

The CG resource is a resource pre-configured by the access network device for the terminal device for performing CG-SDT, and may specifically include a PUSCH resource used for uplink data transmission and corresponding transmission parameters. When pre-configuring CG resources for the terminal device, the access network device may pre-configure one or more CG resources, and the access network device may activate one or more CG resources for the terminal device to perform by sending a resource indication to the terminal device. Used when CG-SDT.

In an optional implementation manner, the second field may be a bitmap (bitmap), the bitmap includes one or more bits, each bit corresponds to a CG resource, and the bits of the bits corresponding to each CG resource are used. A value of 0 or 1 indicates whether the CG resource is activated, and a bitmap including N bits is used to indicate that one or more CG resources among the N CG resources are activated. For example, a bit value of 1 indicates that the CG resource corresponding to this bit is activated, and a bit value of 0 indicates that the CG resource corresponding to this bit is not activated. For CG4 and CG5, the bitmap corresponding to the five CG resources in the resource indication is 00101, which means that CG3 and CG5 are activated and can be used for terminal equipment to perform CG-SDT, and other CG resources are not activated.

3. Beam indication.

The beam indication is used to indicate the correspondence between SSB and CG resources.

We know that in the random access process, one SSB cycle may include multiple SSBs, each SSB has a corresponding number, and the beams corresponding to the multiple SSBs may be the same or different. For a terminal device, when the beam scanning signal corresponding to the SSB covers the terminal device, the terminal device has the opportunity to send the Preamble. Therefore, the terminal device can select the beam with the best signal quality as the optimal beam according to the beam scanning signal, determine the optimal SSB corresponding to the optimal beam, and perform random access on the RO corresponding to the optimal SSB, then the access network The device may determine the SSB information (eg, the index value of the optimal SSB) according to the RO used by the terminal device. The access network device can use the corresponding relationship between the SSB index value and the CG resource as the beam indication. After receiving the beam indication in the transmission indication information, the terminal device can use the beam indication to make some or all of the The CG resources are accessed using the timing corresponding to the optimal SSB index value, which improves the signal quality of the terminal equipment when performing CG-SDT.

Optionally, the beam indication may be carried in the first field of the transmission indication information, occupying two bits in the transmission indication information, and different values of the first field are used to indicate the correspondence between different SSB index values and CG resources. For example, the corresponding relationship between the value of the first field and its corresponding SSB index value and the CG resource is shown in FIG. 17 .

Alternatively, the access network device may also notify the terminal device of the correspondence between the SSB index value and the CG resource through high-layer signaling. The correspondence is sent to the terminal device.

In an optional embodiment, the transmission indication information may also include a contention-free random access resource indication, and a contention-free random access (CFRA) resource is the terminal device performing non-contention-based random access. resources used in the import process.

Optionally, the contention-free random access resource indication may include at least one of a random access preamble index value (Preamble Index), a synchronization signal block index value (SSB Index), an RO resource index value, or a range of RO resource index values. . Among them, the Preamble Index can be carried in the second field of the transmission indication information, which is used to indicate the Preamble used by the terminal device in the random access process; the SSB Index can be carried in the third field of the transmission indication information, and is used to indicate the association with the Preamble. The SSB; the RO resource index value or the RO resource index value range can be indicated by PRACH MASK Index, the PRACH MASK Index can be carried in the fourth field of the transmission indication information, and different values of the fourth field can be used to indicate different RO resources Index value or range of RO resource index values.

Optionally, the contention-free random access resource indication may also include a PO indication. Specifically, the PO indication may be a PO Index. The PO Index is used to indicate the PUSCH used by the terminal device in the two-step random access process. The PO Index may be It is carried in the fifth field of the transmission indication information. In implementation, the number of bits occupied by the fifth field may be determined according to the number of candidate POs. For example, when there are 4 candidate POs, the fifth field may occupy 2 bits, and different POs may occupy 2 bits. The value of the five fields is used to indicate different candidate POs.

For the specific indication mode when the transmission indication information includes the contention-free random access resource indication, reference may be made to the introduction of the contention-free random access resource indication in the data transmission method when the terminal device performs CG-SDT provided in the embodiment of the present application. The repetition will not be repeated.

After introducing the transmission indication information in the embodiment of the present application, the manner in which the access network device sends the transmission indication information in the embodiment of the present application is introduced:

First of all, it is explained that after receiving the Preamble sent by the terminal device, the access network device sends DCI to the terminal device, and sends downlink information on the PDSCH scheduled by the DCI, for example, sends the random access response RAR and conflict resolution information to the terminal device through the PDSCH. Wait for downlink information.

Based on the above description, the access network device can send transmission indication information to the terminal device in the following ways:

Mode 1: The access network device sends DCI to the terminal device, and the DCI includes transmission indication information.

In an optional embodiment, the transmission indication information can be carried on the reserved field of the DCI scrambled by the wireless network temporary identifier (radio network temporary indicator, RNTI), and the reserved field of the DCI scrambled by the RNTI can be: Unoccupied fields in the DCI specified by the existing protocol.

For example, as shown in Table 9, the indication content included in the DCI scrambled by the random access radio network temporary indicator (RA-RNTI) and the number of occupied bits are shown:

Table 9

Wherein, Reserved bits represents the reserved field in DCI, for example, the reserved field of 16 bits shown in Table 9, then the transmission indication information can be carried on the reserved field of 16 bits.

It should be noted that, if the DCI scrambled by the RNTI does not include the reserved field, for example, the DCI scrambled by the temporary cell radio network temporary indicator (TC-RNTI) does not include the reserved field, Then other fields in the DCI can be reused to carry the transmission indication information, such as reusing the VRB-to-PRB mapping and redundancy version fields in the DCI to carry the transmission indication information, where the VRB-to-PRB mapping field is a virtual resource block. The field corresponding to the mapping from (virtual resource block, VRB) to physical resource block (PRB), the Redundancy version field is the field corresponding to the redundancy version, and the original information corresponding to the reused field can be specified by the protocol or High layer signaling is set to default.

Manner 2: The access network device sends DCI to the terminal device, and sends transmission indication information on the PDSCH scheduled by the DCI.

It should be noted that, the mode 1 and the mode 2 may be that the access network device sends the DCI to the terminal device during the random access process, and the DCI includes the transmission indication information or sends the transmission indication information on the PDSCH scheduled by the DCI, for example, in the fourth step In Msg2 or Msg4 in the random access process and MsgB in the two-step random access process, the access network device sends DCI to the terminal device, and the DCI includes transmission indication information or transmits transmission indication information on the PDSCH scheduled by the DCI. In addition, Manner 1 and Manner 2 may also be that after the random access process ends, when the terminal device has not switched from the RRC inactive state to the RRC connected state, the access network device sends DCI to the terminal device, and the DCI includes transmission indication information or Transmission indication information is sent on the PDSCH scheduled by DCI.

Manner 3: The access network device sends the RAR to the terminal device, the RAR includes transmission indication information, and the RAR is carried on the PDSCH scheduled by the DCI.

In a specific implementation, in the 4-step RACH, after receiving the Preamble sent by the terminal device, the access network device sends a RAR to the terminal device, and the RAR may include transmission indication information.

Manner 4: The access network device sends conflict resolution information to the terminal device, the conflict resolution information includes transmission indication information, and the conflict resolution information is carried on the PDSCH scheduled by the DCI.

In an optional implementation manner, in the random access data transmission, the conflict resolution information may include the identity of the terminal equipment that has successfully accessed, and the feedback information corresponding to the uplink small packet data sent by the terminal equipment (used to indicate the access network). whether the device receives uplink small packet data), and transmission indication information.

Manner 5: The access network device sends RRC signaling to the terminal device, the RRC signaling includes transmission indication information, and the RRC signaling is carried on the PDSCH scheduled by the DCI.

When the access network device sends the transmission indication information to the terminal device through the above manners 2 to 5, the transmission indication information may be carried on the logical channel not defined in the MAC CE carried on the PDSCH.

For example, if the logical channels with logical channel numbers 35-46 in the MAC CE are not yet defined logical channels, the transmission indication information can be carried on the logical channels with logical channel numbers 35-46 in the MAC CE.

S1603: The terminal device performs data transmission according to the transmission indication information.

In an optional implementation manner, according to the different indication contents included in the transmission instruction information, the terminal equipment performs data transmission in different ways according to the transmission instruction information. The following describes the data transmission performed by the terminal equipment when the transmission instruction information includes different instruction contents. The transmission method is introduced:

1. The transmission instruction information includes a transmission mode switching instruction.

When the transmission indication information includes a transmission mode switching indication, the terminal device uses the preconfigured authorized resources to perform CG-SDT after the current random access procedure or random access packet transmission ends.

2. The transmission indication information includes a transmission mode switching indication and a resource indication.

When the transmission indication information includes a transmission mode switching indication and a resource indication, the terminal device determines the target pre-configured authorized resource corresponding to the resource indication according to the value of the second field, and the terminal device performs the random access process or the random access packet transmission after the end of the current random access process. , and perform CG-SDT using the target preconfigured authorized resource corresponding to the resource indication.

3. The transmission indication information includes transmission mode switching indication, resource indication and beam indication.

When the transmission indication information includes a transmission mode switching indication, a resource indication and a beam indication, the terminal device determines the target preconfigured authorized resource corresponding to the resource indication according to the value of the second field, and then the terminal device determines the corresponding target preconfigured authorized resource according to the beam indication After the current RACH or RA-SDT ends, the terminal device uses the target pre-configured authorization resource to send uplink small packet data to the access network device at the timing corresponding to the SSB index value.

Optionally, after receiving the transmission indication information sent by the access network device, the terminal device may also send feedback information corresponding to the transmission indication information to the access network device, and the feedback information corresponding to the transmission indication information is used to feedback whether the terminal device accepts or not. Transmission indication of transmission indication information. For example, the terminal device may send feedback information corresponding to the transmission indication information to the access network device through a physical uplink control channel (physical uplink control channel, PUCCH).

Through the above method, when the terminal equipment is in the RRC inactive state, after the access network equipment receives the random access request sent by the terminal equipment, the access network equipment can send transmission indication information to the terminal equipment, so that the random access network equipment of the terminal equipment can send transmission indication information to the terminal equipment. Instruct the terminal device to perform data transmission mode and/or resources during the access process, without requiring the terminal device to obtain reconfigured resources and switch the data transmission mode after recovering from the RRC inactive state to the RRC connected state, saving resource overhead and improving data Transmission flexibility.

The data transmission methods when performing 4-step RA-SDT and 2-step RA-SDT on the terminal equipment provided in the embodiments of the present application are introduced respectively below:

1. The data transmission method when the terminal equipment performs 4-step RA-SDT.

Figure 19 shows a data transmission method when a terminal device provided by an embodiment of the present application performs 4-step RA-SDT, including the following steps:

Msg1: The terminal device sends a Preamble to the access network device on one RO.

Msg2: The access network device sends the DCI scrambled by the RA-RNTI to the terminal device, and sends the RAR on the PDSCH scheduled by the DCI scrambled by the RA-RNTI.

The DCI or RAR scrambled by the RA-RNTI includes transmission indication information. For the specific indication method, refer to the introduction of step S1302 in FIG. 13 , and the repeated description will not be repeated.

Msg3: The terminal device sends the uplink small packet data and/or the identifier of the terminal device to the access network device on the PUSCH scheduled by the RAR.

Msg4: The access network device sends the DCI scrambled by the TC-RNTI to the terminal device, and sends conflict resolution information on the PDSCH scheduled by the DCI scrambled by the TC-RNTI.

The conflict resolution information may carry feedback information corresponding to the uplink small packet data and/or the identifier of the terminal device.

The DCI or conflict resolution information scrambled by the TC-RNTI may include transmission indication information, or the PDSCH may also carry transmission indication information.

In addition, after receiving the transmission indication information, the terminal device may also perform the following steps:

The terminal device sends the ACK/NACK of Msg4 and the feedback information corresponding to the transmission indication information to the access network device.

In a specific implementation, the terminal device can send the ACK/NACK of Msg4 and the feedback information corresponding to the transmission indication information to the access network device through the PUCCH. For example, the PUCCH carries two bits of information through the sequence, one of which is used to indicate the ACK/NACK of Msg4. , and another bit is used to indicate the feedback information corresponding to the transmission indication information.

2. The data transmission method when the terminal equipment performs 2-step RA-SDT.

Figure 20 shows a data transmission method when a terminal device provided by an embodiment of the present application performs 2-step RA-SDT, including the following steps:

MsgA: The terminal device sends the Preamble to the access network device on one RO, and the terminal device sends the uplink small packet data and/or the identifier of the terminal device on one PO.

MsgB: The access network device sends the DCI scrambled by the MsgB-RNTI to the terminal device, and sends conflict resolution information on the PDSCH scheduled by the DCI scrambled by the MsgB-RNTI.

The DCI or conflict resolution information scrambled by the MsgB-RNTI may include transmission indication information, or the PDSCH may also carry transmission indication information.

In a specific implementation, the terminal device can send the ACK/NACK of MsgB and the feedback information corresponding to the transmission indication information to the access network device through the PUCCH. For example, the PUCCH carries two bits of information through the sequence, and one bit is used to indicate the ACK/NACK of Msg4. , and another bit is used to indicate the feedback information corresponding to the transmission indication information.

3. The data transmission method when the terminal device has not switched from the RRC inactive state to the RRC connected state after the random access procedure is finished.

FIG. 21 shows a data transmission method when the random access process provided by the embodiment of the present application ends and the terminal device has not switched from the RRC inactive state to the RRC connected state. The random access process is a two-step random access process. Taking the entry process as an example, the method includes the following steps:

S2101: The terminal device sends the Preamble to the access network device on one RO, and the terminal device sends the uplink small packet data and/or the identifier of the terminal device on one PO.

S2102: The access network device sends the DCI scrambled by the MsgB-RNTI to the terminal device, and sends conflict resolution information on the PDSCH scheduled by the DCI scrambled by the MsgB-RNTI.

S2103: Before the terminal device switches from the RRC inactive state to the RRC connected state, the access network device sends DCI to the terminal device, and sends transmission indication information on the PDSCH scheduled by the DCI, where the transmission indication information includes resource indication and transmission mode switching instruct.

Optionally, the DCI may also include transmission indication information.

S2104: The terminal device sends the uplink small packet data to the access network device by using the preconfigured authorized resource corresponding to the resource indication.

Based on the same technical concept, the present application also provides a communication device 2200 , the structure of which is shown in FIG. 22 , including a communication unit 2201 and a processing unit 2202 . The communication apparatus 2200 can be applied to the terminal equipment or access network equipment in the communication apparatus shown in FIG. 1 , and can implement the data transmission methods shown in FIGS. 6-15 or 16, 19-21. The functions of each unit in the apparatus 2200 will be introduced below.

The communication unit 2201 is used for receiving and sending data.

When the communication apparatus 2200 is applied to a terminal device, the communication unit 2201 may also be called a transceiver, which may be implemented by a mobile communication module and/or a wireless communication module.

The mobile communication module can provide a wireless communication solution including 2G/3G/4G/5G applied on the terminal device. The mobile communication module may include at least one antenna, at least one filter, a switch, a power amplifier, a low noise amplifier (LNA), and the like. The terminal device can access the mobile communication network through the mobile communication module, and then access the certificate management architecture through the mobile communication network.

The wireless communication module can provide applications on terminal devices including wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) networks), Bluetooth (bluetooth, BT), global navigation satellite systems ( global navigation satellite system, GNSS), frequency modulation (frequency modulation, FM), near field communication technology (near field communication, NFC) and other wireless communication solutions. The wireless communication module 160 may include at least one antenna, one or more components of at least one communication processing module. The terminal device can access the wireless communication network through the wireless communication module, and then access the certificate management architecture through the wireless communication network.

When the communication apparatus 2200 is applied to an access network device, the communication unit 2201 may also be referred to as a physical interface, a communication module, a communication interface, and an input/output interface. The access network device can connect a network cable or cable through the communication unit, and then establish a physical connection with other devices.

The following describes the functions of the processing unit 2202 when the communication apparatus 2200 is applied to a terminal device.

In an embodiment of the present application, the communication apparatus 2200 is applied to the terminal device in the first data transmission method provided in the embodiment of the present application, and the communication apparatus 2200 can realize the data shown in FIG. 6 to FIG. 15 of the present application. The functions of the terminal device in the transmission method, the functions of the processing unit 2202 are introduced as follows:

The processing unit 2202 is configured to send the first data to the access network device through the communication unit 2201 through the pre-configured authorization resource when the terminal device is in the RRC inactive state; The transmission indication information of the access network device, the transmission indication information is used to instruct the terminal device to switch the data transmission mode or continue the data transmission; according to the transmission indication information to which it belongs, the communication unit 2201 sends it to the access network device second data, or receive third data sent by the access network device.

In an embodiment, the transmission indication information includes at least one of the following: a power control indication, a transmission mode switching indication, a correct response to the first data, physical uplink shared channel PUSCH scheduling information, and physical downlink shared channel PDSCH Scheduling information, timing advance adjustment instructions, modulation and coding strategy adjustment instructions;

The power control instruction is used to instruct the terminal device to send the transmission power of the second data; the transmission mode switching instruction is used to instruct the terminal device to switch the data transmission mode; the correct response of the first data The response is used to indicate that the access network device has received the first data; the PUSCH scheduling information is used to instruct the terminal device to send the second data on the scheduled PUSCH; the PDSCH scheduling information is used to indicate that the terminal device is scheduling The third data is received on the PDSCH of the device; the timing advance adjustment instruction is used to instruct the terminal device to adjust the timing advance; the modulation and coding strategy adjustment instruction is used to instruct the terminal device to adjust the modulation and coding strategy.

In an implementation manner, when the transmission indication information includes the power control indication, the power control indication is carried in a first field of the transmission indication information; wherein the value of the first field is different Meanwhile, the power control indication is used to indicate different transmit powers;

The processing unit 2202 is specifically configured to: determine the target transmission power indicated by the power control instruction according to the value of the first field in the transmission indication information; send the power according to the target indicated by the power control instruction power, and the second data is sent to the access network device through the communication unit 2201.

In an embodiment, when the transmission instruction information includes the transmission mode switching instruction, the transmission mode switching instruction includes: an identifier of a target data transmission mode and/or a power threshold; wherein the target transmission mode The identifier of the target transmission mode is carried in the second field of the transmission indication information. When the value of the second field is different, the identifier of the target transmission mode is used to indicate the identifier of different data transmission modes; the power threshold is the reference signal The received power threshold value of the power threshold value is carried in the third field of the transmission indication information. When the value of the third field is different, the value of the power threshold value is different.

In an embodiment, when the transmission mode switching instruction includes the identifier of the target data transmission mode, the processing unit 2202 is specifically configured to: when determining that the identifier of the target transmission mode is two-step random access When the identifier corresponding to the data transmission is transmitted, the second data is sent to the access network device through the communication unit 2201 through a two-step random access process; or when the identifier of the target transmission mode is determined to be two-step random access. When the identifier corresponding to the access process is detected, after the two-step random access process is restored from the RRC inactive state to the RRC connected state, the second data is sent to the access network device through the communication unit 2201; or when it is determined that the When the identifier of the target transmission mode is the identifier corresponding to the four-step random access data transmission, the communication unit 2201 sends the second data to the access network device through the four-step random access process; or when it is determined When the identifier of the target transmission mode is the identifier corresponding to the four-step random access process, after the four-step random access process is restored from the RRC inactive state to the RRC connected state, the communication unit 2201 sends the information to the access network through the communication unit 2201. The device sends the second data.

In an embodiment, the processing unit 2202 is specifically configured to: when the transmission mode switching indication includes the power threshold, determine the power threshold according to the value of the third field in the transmission indication information ; When it is determined that the received power of the reference signal is greater than the power threshold, the second data is sent to the access network device through the communication unit 2201 through a two-step random access process, or the second data is sent from the two-step random access process to the access network device. After the RRC inactive state is restored to the RRC connected state, the communication unit 2201 sends the second data to the access network device; or when it is determined that the received power of the reference signal is less than or equal to the power threshold, the four-step random access is performed process, the second data is sent to the access network device through the communication unit 2201, or after the four-step random access process is restored from the RRC inactive state to the RRC connected state, the communication unit 2201 sends the second data to the RRC connected state through the communication unit 2201. The access network device sends the second data.

In an embodiment, the processing unit 2202 is specifically configured to: when the transmission mode switching instruction includes the identifier of the target data transmission mode and the power threshold, according to the third field in the transmission instruction information value, and determine the power threshold; when it is determined that the identifier of the target data transmission mode is the identifier corresponding to random access data transmission, and the received power of the reference signal is greater than the power threshold, a two-step random access process is used to pass The communication unit 2201 sends the second data to the access network device; or when it is determined that the identifier of the target data transmission mode is the identifier corresponding to the random access process, and the received power of the reference signal is greater than the power threshold, the After the two-step random access process is restored from the RRC inactive state to the RRC connected state, the second data is sent to the access network device through the communication unit 2201; or when the identifier of the target data transmission mode is determined to be random access. When the identifier corresponding to the incoming data transmission and the received power of the reference signal is less than or equal to the power threshold, the communication unit 2201 sends the second data to the access network device through the four-step random access procedure; or when it is determined The identifier of the target data transmission mode is the identifier corresponding to the random access process, and when the received power of the reference signal is less than or equal to the power threshold, after recovering from the RRC inactive state to the RRC connected state through the four-step random access process, Send the second data to the access network device through the communication unit 2201 .

In an embodiment, the transmission indication information further includes: a contention-free random access resource indication; the contention-free random access resource indication is used to instruct the terminal device to perform random access in the two steps procedure or the resources used in the four-step random access procedure.

In one embodiment, the contention-free random access resource indication includes at least one of the following index values: a random access preamble index value, a synchronization signal block index value, and a physical random access channel opportunity RO resource index value or RO resource index value range; the random access preamble index value is carried in the fourth field of the transmission indication information; the synchronization signal block index value is carried in the fifth field of the transmission indication information, so The RO resource index value or the RO resource index value range is carried in the sixth field of the transmission indication information.

In an embodiment, the contention-free random access resource indication further includes: a physical uplink shared channel opportunity PO indication, where the PO indication is used to indicate the resource used by the terminal device in the two-step random access process For the uplink shared channel, the PO indication is carried in the seventh field of the transmission indication information.

In an implementation manner, the processing unit 2202 is specifically configured to: if the transmission indication information includes a correct response of the first data; through the process of sending the first data, through the communication unit 2201 Send the second data to the access network device;

If the transmission indication information does not include the correct response of the first data, the communication unit 2201 sends the second data to the access network device through the process of sending the first data; wherein , the second data is the same as the first data, or the information bits of the second data and the first data are the same, or the valid information of the second data and the first data are the same, or the The second data is a redundant version of the first data.

In an embodiment, the processing unit 2202 is specifically configured to: when the transmission indication information includes the PDSCH scheduling information, determine the PDSCH scheduled by the transmission indication information according to the PDSCH scheduling information; The unit 2201 receives the third data on the PDSCH scheduled by the transmission indication information.

In an embodiment, the transmission indication information further includes: a feedback power control indication, where the feedback power control indication is used to instruct the terminal device to transmit the transmit power of the feedback information corresponding to the PDSCH, and the feedback power control indication The indication is carried in the eighth field of the transmission indication information, and when the value of the eighth field is different, the feedback power control indication is used to indicate different transmit powers.

In an implementation manner, the processing unit 2202 is further configured to: receive through the communication unit 2201 if the transmission indication information does not include the correct response response of the first data and the power control indication The radio resource control RRC signaling sent by the access network device, the RRC signaling includes configuration information instructing the terminal device to use the feedback power control indication as a power control indication; According to the value of the eighth field, the transmission power indicated by the feedback power control indication is determined; according to the transmission power indicated by the feedback power control indication, the communication unit 2201 sends the transmission power to the access network device through the communication unit 2201. Second data.

In an implementation manner, the RRC signaling includes a correct response response of the first data; or the processing unit 2202 is further configured to: receive a response from the access network device through the communication unit 2201 After the indication information is transmitted, the medium access control MAC control element CE sent by the access network device is received, and the MAC CE includes the correct response response of the first data.

In an embodiment, the PUSCH scheduling information is retransmission PUSCH scheduling information or newly transmitted PUSCH scheduling information;

The processing unit 2202 is specifically configured to: when the PUSCH scheduling information is retransmission PUSCH scheduling information, on the PUSCH scheduled by the retransmission PUSCH scheduling instruction, send the communication unit 2201 to the access network device through the communication unit 2201. Sending the second data, wherein the second data is the same as the first data, or the information bits of the second data and the first data are the same, or the second data and the first data are the same The valid information of the data is the same, or the second data is a redundant version of the first data; when the PUSCH scheduling information is the newly transmitted PUSCH scheduling information, on the PUSCH scheduled by the newly transmitted PUSCH scheduling information, Send the second data to the access network device through the communication unit 2201 .

In an embodiment, when the transmission indication information includes the timing advance adjustment indication, the timing advance adjustment indication is carried in the ninth field of the transmission indication information.

In an implementation manner, the processing unit 2202 is further configured to: send the second data to the access network device through the communication unit 2201 according to the transmission indication information, or receive the access network device Before the third data sent by the device, determine a target timing advance according to the timing advance adjustment instruction, and adjust the timing advance of the terminal device according to the target timing advance.

In an implementation manner, when the transmission indication information includes the modulation and coding strategy adjustment indication, the modulation and coding strategy adjustment indication is carried in the tenth field of the transmission indication information, and the tenth field takes the value of When the values are different, the modulation and coding strategy adjustment indication is used to indicate different modulation and coding strategies.

In an implementation manner, the processing unit 2202 is further configured to: send the second data to the access network device through the communication unit 2201 according to the transmission indication information, or receive the access network device Before the third data sent by the device, the modulation and coding strategy of the terminal device is adjusted according to the modulation and coding strategy adjustment instruction.

In another implementation manner of the present application, the communication apparatus 2200 is applied to the terminal device in the second data transmission method provided by the embodiment of the present application, and the communication apparatus 2200 may implement FIG. 16 , FIG. 19 to FIG. 21 of the present application The functions of the terminal device in the data transmission method shown, the functions of the processing unit 2202 are introduced as follows:

The processing unit 2202 is configured to send a random access request to the access network device through the communication unit 2201 when the terminal device is in the RRC inactive state; and receive data from the access network through the communication unit 2201 Transmission indication information of the device, the transmission indication information is used to instruct the terminal device to perform data transmission methods and/or resources; according to the transmission indication information, the communication unit 2201 performs data transmission.

In an embodiment, the transmission indication information includes at least one of the following: a transmission mode switching indication, a resource indication, and a beam indication; wherein the transmission mode switching indication is used to indicate that the terminal device is in a random access process or a beam indication. After the random access data transmission is completed, switch to the authorization-free scheduling data transmission; the resource indication is used to instruct the terminal equipment to perform pre-configured authorization resources when the authorization-free scheduling data transmission is performed; the beam indication is used to indicate the synchronization signal block The corresponding relationship with the preconfigured authorization resource.

In an implementation manner, when the transmission indication information includes the transmission mode switching indication, the transmission indication information is carried in the first field of the transmission indication information;

The processing unit 2202 is specifically configured to: after it is determined that the random access process or the random access data transmission ends, use the preconfigured authorized resources to perform authorization-free scheduling data transmission through the communication unit 2201; The incoming data transmission is a two-step random access data transmission or a four-step random access data transmission, and the random access process is a two-step random access process or a four-step random access process.

In an embodiment, when the transmission indication information includes the resource indication, the resource indication is carried in a second field of the transmission indication information, wherein the value of the second field is different, and the The resource indication is used to indicate activation of different preconfigured authorized resources.

In an embodiment, when the transmission indication information includes the beam indication, the beam indication is carried in a third field of the transmission indication information, wherein when the values of the third field are different, the The beam indication is used to indicate the correspondence between different synchronization signal blocks and the preconfigured grant resources.

In an implementation manner, the processing unit 2202 is specifically configured to: receive, through the communication unit 2201, downlink control information sent by the access network device, where the downlink control information includes the transmission indication information.

In an implementation manner, the transmission indication information is carried in a reserved field in the downlink control information.

In an embodiment, the processing unit 2202 is specifically configured to: receive the downlink control information sent by the access network device through the communication unit 2201, and use the downlink control information to schedule the physical downlink shared channel PDSCH or receive the random access response information sent by the access network device through the communication unit 2201, where the random access response information includes the transmission indication information, the random access response information The response information is carried on the PDSCH; or the conflict resolution information sent by the access network device is received by the communication unit 2201, the conflict resolution information includes the transmission indication information, and the conflict resolution information is carried in the or receive the radio resource control RRC signaling sent by the access network device through the communication unit 2201, the RRC signaling includes the transmission indication information, and the RRC signaling is carried on the PDSCH superior.

In an embodiment, the medium access control MAC control element CE is carried on the PDSCH.

In one embodiment, the transmission indication information is carried on a logical channel not defined in the MAC CE.

In an embodiment, the transmission indication information further includes: a contention-free random access resource indication; the contention-free random access resource indication is used to indicate that the terminal device is in a random access process or random access Resources used in data transfer.

In an embodiment, the contention-free random access resource indication further includes: a physical uplink shared channel opportunity PO indication, where the PO indication is used to indicate a two-step random access process or a two-step random access data transmission The uplink shared channel used by the terminal device, and the PO indication is carried in the seventh field of the transmission indication information.

In an embodiment, the processing unit 2202 is further configured to: after receiving the transmission indication information from the access network device through the communication unit 2201, send the transmission indication information corresponding to the access network device to the access network device Feedback information, where the feedback information is used to feed back whether the terminal device accepts the transmission indication of the transmission indication information.

The following describes the functions of the processing unit 2202 when the communication apparatus 2200 is applied to an access network device.

In an embodiment of the present application, the communication apparatus 2200 is applied to the access network device in the first data transmission method provided in the embodiment of the present application, and the communication apparatus 2200 can implement the communication shown in FIG. 6 to FIG. 15 of the present application. The functions of the access network equipment in the data transmission method described above, the functions of the processing unit 2202 are introduced as follows:

The processing unit 2202 is configured to receive, through the communication unit 2201, the first data sent by the terminal device in the RRC inactive state through the preconfigured authorized resources; send a transmission instruction to the terminal device through the communication unit 2201 The transmission indication information is used to instruct the terminal device to switch the data transmission mode or continue data transmission; receive the second data sent by the terminal device through the communication unit 2201, or send the third data to the terminal device .

In an embodiment, the transmission indication information includes at least one of the following: a power control indication, a transmission mode switching indication, a correct response to the first data, physical uplink shared channel PUSCH scheduling information, and physical downlink shared channel PDSCH scheduling information, timing advance adjustment instruction, modulation and coding strategy adjustment instruction; wherein, the power control instruction is used to instruct the terminal device to send the transmission power of the second data; the transmission mode switching instruction is used to indicate the The terminal device switches the data transmission mode; the correct response response of the first data is used to indicate that the access network device receives the first data; the PUSCH scheduling information is used to instruct the terminal device to send on the scheduled PUSCH the second data; the PDSCH scheduling information is used to instruct the terminal equipment to receive the third data on the scheduled PDSCH; the timing advance adjustment instruction is used to instruct the terminal equipment to adjust the timing advance; the modulation and coding strategy adjustment instruction is used for It is used to instruct the terminal equipment to adjust the modulation and coding strategy.

In an implementation manner, when the transmission indication information includes the power control indication, the power control indication is carried in a first field of the transmission indication information; wherein the value of the first field is different Meanwhile, the power control indication is used to indicate different transmit powers.

In an embodiment, when the transmission instruction information includes the transmission mode switching instruction, the transmission mode switching instruction includes: an identifier of a target data transmission mode and/or a power threshold; The identifier is carried in the second field of the transmission indication information, and when the value of the second field is different, the target transmission mode is used to indicate different data transmission modes; the power threshold is the received power threshold of the reference signal, The power threshold is carried in the third field of the transmission indication information, and when the value of the third field is different, the value of the power threshold is different.

In an implementation manner, the processing unit 2202 is specifically configured to: receive, through the communication unit 2201, the second data sent by the terminal device through a two-step random access procedure or a four-step random access procedure; or The communication unit 2201 receives the second data sent by the terminal device after the terminal equipment recovers from the RRC inactive state to the RRC connected state through a two-step random access procedure or a four-step random access procedure.

In an embodiment, the contention-free random access resource indication further includes: a physical uplink shared channel opportunity PO indication, where the PO indication is used to indicate an uplink shared channel used in the two-step random access process, The PO indication is carried in the seventh field of the transmission indication information.

In an implementation manner, the processing unit 2202 is specifically configured to: when the transmission indication information includes a correct response response of the first data, receive, through the communication unit 2201, the terminal device by sending the the second data sent by the process of the first data; when the transmission indication information does not include the correct response of the first data, the communication unit 2201 receives the terminal device by sending the first data Second data sent by a process of data; wherein the second data is the same as the first data, or the information bits of the second data and the first data are the same, or the second data and all The valid information of the first data is the same, or the second data is a redundant version of the first data.

In an embodiment, the processing unit 2202 is specifically configured to: when the transmission indication information includes the PDSCH scheduling information, send the communication unit 2201 to the PDSCH scheduled by the PDSCH scheduling information through the communication unit 2201 The terminal device sends the third data.

In an embodiment, the transmission indication information further includes a feedback power control indication, where the feedback power control indication is used to instruct the terminal device to transmit the transmit power of the feedback information corresponding to the PDSCH; the feedback power control indication It is carried in the eighth field of the transmission indication information, and when the value of the eighth field is different, the feedback power control indication is used to indicate different transmit powers.

In an implementation manner, the processing unit 2202 is further configured to: when the transmission indication information does not include the correct response response of the first data and the power control indication, send the communication unit 2201 to the The terminal device sends radio resource control RRC signaling, where the RRC signaling includes configuration information instructing the terminal device to use the feedback power control indication as a power control indication.

In an implementation manner, the RRC signaling includes a correct response response of the first data; or the processing unit 2202 is further configured to: send a transmission indication to the terminal device through the communication unit 2201 After the information, the communication unit 2201 sends a medium access control MAC control element CE to the terminal device, where the MAC CE includes a correct response response corresponding to the first data.

In an embodiment, the PUSCH scheduling information is retransmission PUSCH scheduling information or newly transmitted PUSCH scheduling information; the processing unit 2202 is specifically configured to: when the PUSCH scheduling information is retransmission PUSCH scheduling information, pass The communication unit 2201 receives, on the PUSCH scheduled by the retransmitted PUSCH scheduling information, second data sent by the terminal device, where the second data is the same as the first data, or the second data is the same as the information bits of the first data, or the valid information of the second data and the first data is the same, or the second data is a redundant version of the first data; when the PUSCH scheduling When the information is the newly transmitted PUSCH scheduling information, the communication unit 2201 receives the second data sent by the terminal device on the PUSCH scheduled by the newly transmitted PUSCH scheduling information.

In an embodiment, when the transmission indication information includes the modulation and coding strategy adjustment indication, the modulation and coding strategy adjustment indication is carried in the tenth field of the transmission indication information, and the tenth field When the values are different, the modulation and coding strategy adjustment indication is used to indicate different modulation and coding strategies.

In another implementation manner of the present application, the communication apparatus 2200 is applied to the access network equipment in the second data transmission method provided in the embodiment of the present application, and the communication apparatus 2200 may implement the implementation of FIG. 16 and FIG. 19- The functions of the access network device in the data transmission method shown in FIG. 21, the functions of the processing unit 2202 are introduced as follows:

The processing unit 2202 is configured to receive, through the communication unit 2201, a random access request from a terminal device in an RRC inactive state; send transmission indication information to the terminal device through the communication unit 2201, and the transmission The indication information includes resource indication, where the resource indication is used to instruct the terminal device to perform data transmission mode and/or resource.

In an embodiment, the transmission indication information includes at least one of the following: a transmission mode switching indication, a resource indication, and a beam indication; the transmission mode switching indication is used to indicate that the terminal device is in a random access process or random access After the incoming data transmission is completed, switch to the authorization-free scheduling data transmission; the resource indication is used to instruct the terminal equipment to perform pre-configured authorization resources when the authorization-free scheduling data transmission is performed; the beam indication is used to indicate that the synchronization signal block and all The corresponding relationship of the pre-configured authorization resources is described.

In an embodiment, when the transmission indication information includes a transmission mode switching indication, the transmission indication information is carried in the first field of the transmission indication information; wherein, the random access data transmission is two One-step random access data transmission or four-step random access data transmission, and the random access process is a two-step random access process or a four-step random access process.

In an embodiment, when the transmission indication information includes the beam indication, the beam indication is carried in a third field of the transmission indication information, wherein when the values of the third fields are different, the The beam indication is used to indicate the correspondence between different synchronization signal blocks and the preconfigured grant resources.

In an implementation manner, the processing unit 2202 is specifically configured to: send downlink control information to the terminal device through the communication unit 2201, where the downlink control information includes the transmission indication information.

In an embodiment, the processing unit 2202 is specifically configured to: send downlink control information to the terminal device through the communication unit 2201, and send the downlink control information on the physical downlink shared channel PDSCH scheduled by the downlink control information. or send random access response information to the terminal device through the communication unit 2201, where the random access response information includes the transmission indication information, and the random access response information is carried in the on the PDSCH; or send conflict resolution information to the terminal device through the communication unit 2201, where the conflict resolution information includes the transmission indication information, and the conflict resolution information is carried on the PDSCH; or through the communication Unit 2201 sends radio resource control RRC signaling to the terminal device, where the RRC signaling includes the transmission indication information, and the RRC signaling is carried on the PDSCH.

In one embodiment, the contention-free random access resource indication includes at least one of the following index values: random access preamble index value, synchronization signal block index value, physical random access channel opportunity RO resource index value, or The range of RO resource index values; the random access preamble index value is carried in the fourth field of the transmission indication information; the synchronization signal block index value is carried in the fifth field of the transmission indication information, the The RO resource index value or the RO resource index value range is carried in the sixth field of the transmission indication information.

In an implementation manner, the processing unit 2202 is further configured to: after the access network device sends the transmission indication information to the terminal device, receive the transmission indication from the terminal device through the communication unit 2201 Feedback information corresponding to the information, where the feedback information is used to feed back whether the terminal device accepts the transmission indication of the transmission indication information.

Based on the same technical idea, the present application also provides a communication device 2300 . The communication apparatus 2300 may be used to implement the functions of the terminal device or the access network device in the communication system shown in FIG. 1 . Referring to FIG. 23 , the communication device 2300 includes: a communication interface 2301 , a processor 2302 and a memory 2303 . The communication interface 2301, the processor 2302 and the memory 2303 are connected to each other.

Optionally, the communication interface 2301 , the processor 2302 and the memory 2303 are connected to each other through a bus 2304 . The bus 2304 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus or the like. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is shown in FIG. 23, but it does not mean that there is only one bus or one type of bus.

The communication interface 2301 is used for receiving and sending data to realize communication interaction with other devices. Exemplarily, the communication interface 2301 may be a transceiver, circuit, bus, module or other type of communication interface.

In an embodiment of the present application, the communication apparatus 2300 can implement the functions of the terminal device in the data transmission method shown in FIGS. 6-15 of the present application. The functions of the processor 2302 are described as follows:

The processor 2302 is configured to send the first data to the access network device through the communication interface 2301 through the pre-configured authorization resource when the terminal device is in the RRC inactive state; Transmission indication information of the access network device, the transmission indication information is used to instruct the terminal device to switch the data transmission mode or continue data transmission; according to the transmission indication information to which it belongs, it is sent to the access network device through the communication interface 2301 second data, or receive third data sent by the access network device.

The processor 2302 is specifically configured to: determine the target transmission power indicated by the power control instruction according to the value of the first field in the transmission indication information; send the power according to the target indicated by the power control instruction power, and the second data is sent to the access network device through the communication interface 2301.

In an embodiment, when the transmission mode switching instruction includes the identifier of the target data transmission mode, the processor 2302 is specifically configured to: when determining that the identifier of the target transmission mode is two-step random access When the identifier corresponding to the data transmission is sent, the second data is sent to the access network device through the communication interface 2301 through a two-step random access process; or when the identifier of the target transmission mode is determined to be two-step random access. When the identifier corresponding to the access process is detected, after the two-step random access process is restored from the RRC inactive state to the RRC connected state, the second data is sent to the access network device through the communication interface 2301; or when it is determined that the When the identifier of the target transmission mode is the identifier corresponding to the four-step random access data transmission, the second data is sent to the access network device through the communication interface 2301 through the four-step random access process; or when it is determined When the identifier of the target transmission mode is the identifier corresponding to the four-step random access process, after the four-step random access process is restored from the RRC inactive state to the RRC connected state, the access network is sent to the access network through the communication interface 2301. The device sends the second data.

In an embodiment, the processor 2302 is specifically configured to: when the transmission mode switching indication includes the power threshold, determine the power threshold according to the value of the third field in the transmission indication information When it is determined that the received power of the reference signal is greater than the power threshold, the second data is sent to the access network device through the communication interface 2301 through the two-step random access process, or the second data is sent from the two-step random access process to the access network device through the communication interface 2301. After the RRC inactive state is restored to the RRC connected state, the second data is sent to the access network device through the communication interface 2301; or when it is determined that the received power of the reference signal is less than or equal to the power threshold, the four-step random access is performed process, the second data is sent to the access network device through the communication interface 2301, or after the four-step random access process is restored from the RRC inactive state to the RRC connected state, the second data is sent to the access network device through the communication interface 2301. The access network device sends the second data.

In an embodiment, the processor 2302 is specifically configured to: when the transmission mode switching instruction includes the identifier of the target data transmission mode and the power threshold, according to the third field in the transmission instruction information value, and determine the power threshold; when it is determined that the identifier of the target data transmission mode is the identifier corresponding to random access data transmission, and the received power of the reference signal is greater than the power threshold, a two-step random access process is used to pass The communication interface 2301 sends the second data to the access network device; or when it is determined that the identifier of the target data transmission mode is the identifier corresponding to the random access process, and the received power of the reference signal is greater than the power threshold, the After the two-step random access process is restored from the RRC inactive state to the RRC connected state, the second data is sent to the access network device through the communication interface 2301; or when it is determined that the identifier of the target data transmission mode is random access. When the identifier corresponding to the incoming data transmission is received, and the received power of the reference signal is less than or equal to the power threshold, the second data is sent to the access network device through the communication interface 2301 through the four-step random access procedure; or when it is determined The identifier of the target data transmission mode is the identifier corresponding to the random access process, and when the received power of the reference signal is less than or equal to the power threshold, after recovering from the RRC inactive state to the RRC connected state through the four-step random access process, The second data is sent to the access network device through the communication interface 2301 .

In an implementation manner, the processor 2302 is specifically configured to: if the transmission indication information includes a correct response response of the first data; through the process of sending the first data, through the communication interface 2301 Send the second data to the access network device;

If the transmission indication information does not include the correct response response of the first data, the second data is sent to the access network device through the communication interface 2301 through the process of sending the first data; wherein , the second data is the same as the first data, or the information bits of the second data and the first data are the same, or the valid information of the second data and the first data are the same, or the The second data is a redundant version of the first data.

In an embodiment, the processor 2302 is specifically configured to: when the transmission indication information includes the PDSCH scheduling information, determine the PDSCH scheduled by the transmission indication information according to the PDSCH scheduling information; The interface 2301 receives the third data on the PDSCH scheduled by the transmission indication information.

In an implementation manner, the processor 2302 is further configured to: receive through the communication interface 2301 if the transmission indication information does not include the correct response response of the first data and the power control indication The radio resource control RRC signaling sent by the access network device, the RRC signaling includes configuration information instructing the terminal device to use the feedback power control indication as a power control indication; According to the value of the eighth field, the transmission power indicated by the feedback power control indication is determined; according to the transmission power indicated by the feedback power control indication, the communication interface 2301 sends the transmission power to the access network device. Second data.

In an implementation manner, the RRC signaling includes a correct response response of the first data; or the processor 2302 is further configured to: receive a response from the access network device through the communication interface 2301 After the indication information is transmitted, the medium access control MAC control element CE sent by the access network device is received, and the MAC CE includes the correct response response of the first data.

The processor 2302 is specifically configured to: when the PUSCH scheduling information is retransmission PUSCH scheduling information, on the PUSCH scheduled by the retransmission PUSCH scheduling information, send the communication interface 2301 to the access network device through the communication interface 2301 Sending the second data, wherein the second data is the same as the first data, or the information bits of the second data and the first data are the same, or the second data and the first data are the same The valid information of the data is the same, or the second data is a redundant version of the first data; when the PUSCH scheduling information is the newly transmitted PUSCH scheduling information, on the PUSCH scheduled by the newly transmitted PUSCH scheduling information, The second data is sent to the access network device through the communication interface 2301 .

In an implementation manner, the processor 2302 is further configured to: send the second data to the access network device through the communication interface 2301 according to the transmission indication information, or receive the access network device Before the third data sent by the device, determine a target timing advance according to the timing advance adjustment instruction, and adjust the timing advance of the terminal device according to the target timing advance.

In an implementation manner, the processor 2302 is further configured to: send the second data to the access network device through the communication interface 2301 according to the transmission indication information, or receive the access network device Before the third data sent by the device, the modulation and coding strategy of the terminal device is adjusted according to the modulation and coding strategy adjustment instruction.

In another implementation manner of the present application, the communication apparatus 2300 may implement the functions of the terminal device in the data transmission methods shown in FIG. 16 and FIG. 19 to FIG. 21 of the present application. The functions of the processor 2302 are described as follows:

The processor 2302 is configured to send a random access request to the access network device through the communication interface 2301 when the terminal device is in the RRC inactive state; and receive data from the access network through the communication interface 2301. Transmission indication information of the device, the transmission indication information is used to instruct the terminal device to perform data transmission methods and/or resources; data transmission is performed through the communication interface 2301 according to the transmission indication information.

The processor 2302 is specifically configured to: use the preconfigured authorized resources to perform authorization-free scheduling data transmission through the communication interface 2301 after it is determined that the random access process or the random access data transmission ends; wherein the random access The incoming data transmission is a two-step random access data transmission or a four-step random access data transmission, and the random access process is a two-step random access process or a four-step random access process.

In an implementation manner, the processor 2302 is specifically configured to receive, through the communication interface 2301, downlink control information sent by the access network device, where the downlink control information includes the transmission indication information.

In an embodiment, the processor 2302 is specifically configured to: receive the downlink control information sent by the access network device through the communication interface 2301, and use the physical downlink shared channel PDSCH scheduled by the downlink control information receive the transmission indication information through the communication interface 2301; or receive the random access response information sent by the access network device through the communication interface 2301, where the random access response information includes the transmission indication information, the random access response information The response information is carried on the PDSCH; or the conflict resolution information sent by the access network device is received through the communication interface 2301, the conflict resolution information includes the transmission indication information, and the conflict resolution information is carried on the or receive the radio resource control RRC signaling sent by the access network device through the communication interface 2301, the RRC signaling includes the transmission indication information, and the RRC signaling is carried on the PDSCH superior.

In an implementation manner, the processor 2302 is further configured to: after receiving the transmission indication information from the access network device through the communication interface 2301, send the transmission indication information corresponding to the access network device to the access network device Feedback information, where the feedback information is used to feed back whether the terminal device accepts the transmission indication of the transmission indication information.

In an embodiment of the present application, the communication apparatus 2300 can implement the functions of the access network equipment in the data transmission methods shown in FIGS. 6-15 of the present application, and the functions of the processor 2302 are introduced as follows:

The processor 2302 is configured to receive, through the communication interface 2301, the first data sent by the terminal device in the RRC inactive state through the preconfigured authorized resources; send a transmission instruction to the terminal device through the communication interface 2301 The transmission indication information is used to instruct the terminal device to switch the data transmission mode or continue data transmission; to receive the second data sent by the terminal device through the communication interface 2301, or to send the third data to the terminal device .

In an implementation manner, the processor 2302 is specifically configured to: receive, through the communication interface 2301, the second data sent by the terminal device through a two-step random access procedure or a four-step random access procedure; or The communication interface 2301 receives the second data sent by the terminal device after the terminal device recovers from the RRC inactive state to the RRC connected state through a two-step random access procedure or a four-step random access procedure.

In an implementation manner, the processor 2302 is specifically configured to: when the transmission indication information includes a correct response response of the first data, receive, through the communication interface 2301, the terminal device by sending the the second data sent by the process of the first data; when the transmission indication information does not include the correct response of the first data, the terminal device receives the first data through the communication interface 2301 by sending the first data. Second data sent by a process of data; wherein the second data is the same as the first data, or the information bits of the second data and the first data are the same, or the second data and all The valid information of the first data is the same, or the second data is a redundant version of the first data.

In an implementation manner, the processor 2302 is specifically configured to: when the transmission indication information includes the PDSCH scheduling information, send the communication interface 2301 to the PDSCH scheduled by the PDSCH scheduling information through the communication interface 2301 The terminal device sends the third data.

In an implementation manner, the processor 2302 is further configured to: when the transmission indication information does not include the correct response response of the first data and the power control indication, send the communication interface 2301 to the The terminal device sends radio resource control RRC signaling, where the RRC signaling includes configuration information instructing the terminal device to use the feedback power control indication as a power control indication.

In an implementation manner, the RRC signaling includes a correct response response of the first data; or the processor 2302 is further configured to: send a transmission indication to the terminal device through the communication interface 2301 After the information, the medium access control MAC control element CE is sent to the terminal device through the communication interface 2301, and the MAC CE includes the correct response response corresponding to the first data.

In an embodiment, the PUSCH scheduling information is retransmission PUSCH scheduling information or newly transmitted PUSCH scheduling information; the processor 2302 is specifically configured to: when the PUSCH scheduling information is retransmission PUSCH scheduling information, pass The communication interface 2301 receives second data sent by the terminal device on the PUSCH scheduled by the retransmitted PUSCH scheduling information, where the second data is the same as the first data, or the second data is the same as the first data. is the same as the information bits of the first data, or the valid information of the second data and the first data is the same, or the second data is a redundant version of the first data; when the PUSCH scheduling When the information is the newly transmitted PUSCH scheduling information, the second data sent by the terminal device is received on the PUSCH scheduled by the newly transmitted PUSCH scheduling information through the communication interface 2301 .

In another implementation manner of the present application, the communication apparatus 2300 may implement the functions of the access network equipment in the data transmission methods shown in FIG. 16 and FIG. 19-FIG. 21 of the present application. The functions of the processor 2302 are described as follows:

The processor 2302 is configured to receive, through the communication interface 2301, a random access request from a terminal device in an RRC inactive state; send transmission indication information to the terminal device through the communication interface 2301, and the transmission The indication information includes resource indication, where the resource indication is used to instruct the terminal device to perform data transmission mode and/or resource.

In an implementation manner, the processor 2302 is specifically configured to: send downlink control information to the terminal device through the communication interface 2301, where the downlink control information includes the transmission indication information.

In an embodiment, the processor 2302 is specifically configured to: send downlink control information to the terminal device through the communication interface 2301, and send the downlink control information on the physical downlink shared channel PDSCH scheduled by the downlink control information. or send random access response information to the terminal device through the communication interface 2301, where the random access response information includes the transmission indication information, and the random access response information is carried in the on the PDSCH; or send conflict resolution information to the terminal device through the communication interface 2301, where the conflict resolution information includes the transmission indication information, and the conflict resolution information is carried on the PDSCH; or through the communication The interface 2301 sends radio resource control RRC signaling to the terminal device, where the RRC signaling includes the transmission indication information, and the RRC signaling is carried on the PDSCH.

In an implementation manner, the processor 2302 is further configured to: after the access network device sends the transmission indication information to the terminal device, receive the transmission indication from the terminal device through the communication interface 2301 Feedback information corresponding to the information, where the feedback information is used to feed back whether the terminal device accepts the transmission indication of the transmission indication information.

The memory 2303 is used to store program instructions and data. Specifically, the program instructions may include program code, and the program code includes computer operation instructions. The memory 2303 may include random access memory (RAM), and may also include non-volatile memory (non-volatile memory), such as at least one disk storage. The processor 2302 executes the program instructions stored in the memory 2303, and uses the data stored in the memory 2303 to implement the above functions, thereby implementing the data transmission method provided by the above embodiments.

It is understood that the memory in FIG. 23 of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. Wherein, the non-volatile memory may be a read-only memory (Read-Only Memory, ROM), a programmable read-only memory (Programmable ROM, PROM), an erasable programmable read-only memory (Erasable PROM, EPROM), an electrically programmable read-only memory (Erasable PROM, EPROM). Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. Volatile memory may be Random Access Memory (RAM), which acts as an external cache. By way of illustration and not limitation, many forms of RAM are available, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (Synchlink DRAM, SLDRAM) ) and direct memory bus random access memory (Direct Rambus RAM, DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but not be limited to, these and any other suitable types of memory.

Based on the above embodiments, the embodiments of the present application also provide a computer program, when the computer program runs on a computer, the computer is made to execute the programs shown in FIGS. 6-15 or 16 and 19-21. The data transmission method provided by the embodiment.

Based on the above embodiments, the embodiments of the present application further provide a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a computer, the computer executes FIG. 6-FIG. 15 or The data transmission methods provided by the embodiments shown in FIG. 16 and FIG. 19 to FIG. 21 . The storage medium may be any available medium that the computer can access. By way of example and not limitation, computer readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage media or other magnetic storage devices, or be capable of carrying or storing instructions or data structures in the form of desired program code and any other medium that can be accessed by a computer.

Based on the above embodiments, the embodiments of the present application provide a communication system, including a terminal device and an access network device, wherein the terminal device and the access network device can implement FIG. 6-FIG. 15 or FIG. 16, FIG. 19- The data transmission method provided by the embodiment shown in FIG. 21 .

Based on the above embodiments, an embodiment of the present application also provides a chip, which is used to read a computer program stored in a memory, and implement the embodiments shown in FIGS. 6-15 or 16 and 19-21 Provided data transfer method.

Based on the above embodiments, an embodiment of the present application provides a chip system, where the chip system includes a processor for supporting a computer device to implement the terminal in the embodiment shown in FIGS. 6 to 15 or 16 and 19 to 21 . The functions involved in the device or access network equipment. In a possible design, the chip system further includes a memory for storing necessary programs and data of the computer device. The chip system may be composed of chips, or may include chips and other discrete devices.

As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the present application. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the protection 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

A data transmission method, characterized in that the method comprises:

The terminal device sends the first data to the access network device through the preconfigured authorization resource during the RRC inactive state process;

receiving transmission indication information from the access network device, where the transmission indication information is used to instruct to switch the data transmission mode or continue data transmission;

According to the transmission indication information, the second data is sent to the access network device, or the third data sent by the access network device is received.
The method according to claim 1, wherein the transmission indication information comprises at least one of the following: a power control indication, a transmission mode switching indication, a correct response to the first data, and physical uplink shared channel PUSCH scheduling information , physical downlink shared channel PDSCH scheduling information, timing advance adjustment indication, modulation and coding strategy adjustment indication;

Wherein, the power control indication is used to indicate the transmit power for transmitting the second data;

The transmission mode switching instruction is used to instruct to switch the data transmission mode;

The correct response response of the first data is used to indicate that the access network device receives the first data;

The PUSCH scheduling information is used to indicate that the second data is sent on the scheduled PUSCH;

The PDSCH scheduling information is used to indicate that the third data is received on the scheduled PDSCH;

The timing advance adjustment instruction is used to instruct to adjust the timing advance;

The modulation and coding strategy adjustment instruction is used to instruct to adjust the modulation and coding strategy.
The method according to claim 2, wherein when the transmission indication information includes the power control indication, the power control indication is carried in a first field of the transmission indication information; wherein, the When the value of the first field is different, the power control indication is used to indicate different transmit power;

The sending the second data to the access network device according to the transmission indication information includes:

determining the target transmit power indicated by the power control indication according to the value of the first field in the transmission indication information;

The second data is sent to the access network device according to the target transmit power indicated by the power control instruction.
The method according to claim 2 or 3, wherein when the transmission instruction information includes the transmission mode switching instruction, the transmission mode switching instruction includes: an identifier of a target data transmission mode and/or a power threshold ; Wherein, the identification of the target transmission mode is carried in the second field of the transmission indication information, and when the second field takes a different value, the identification of the target transmission mode is used to indicate the identification of different data transmission modes ; the power threshold is the received power threshold of the reference signal, the power threshold is carried in the third field of the transmission indication information, and when the third field has different values, the power thresholds have different values.
The method according to claim 4, wherein when the transmission mode switching instruction includes an identifier of the target data transmission mode, the sending the access network device according to the transmission instruction information Second data, including:

When it is determined that the identifier of the target transmission mode is an identifier corresponding to the two-step random access data transmission, send the second data to the access network device through a two-step random access procedure; or

When it is determined that the identifier of the target transmission mode is the identifier corresponding to the two-step random access process, after the two-step random access process is restored from the RRC inactive state to the RRC connected state, the second data; or

When it is determined that the identifier of the target transmission mode is the identifier corresponding to the four-step random access data transmission, the second data is sent to the access network device through the four-step random access procedure; or

When it is determined that the identifier of the target transmission mode is the identifier corresponding to the four-step random access process, after the four-step random access process is restored from the RRC inactive state to the RRC connected state, the Second data.
The method according to claim 4, wherein when the transmission mode switching indication includes the power threshold, the sending the second data to the access network device according to the transmission indication information, include:

determining the power threshold according to the value of the third field in the transmission indication information;

When it is determined that the received power of the reference signal is greater than the power threshold, send the second data to the access network device through a two-step random access process, or restore from an RRC inactive state to an RRC connection through a two-step random access process After being in the state, send the second data to the access network device; or

When it is determined that the received power of the reference signal is less than or equal to the power threshold, send the second data to the access network device through a four-step random access process, or recover from the RRC inactive state to the RRC inactive state through a four-step random access process In the RRC connected state, the second data is sent to the access network device.
The method according to claim 4, wherein, when the transmission mode switching instruction includes the identifier of the target data transmission mode and the power threshold, the transmission mode switching instruction to the access mode according to the transmission instruction information The network device sends the second data, including:

determining the power threshold according to the value of the third field in the transmission indication information;

When it is determined that the identifier of the target data transmission mode is an identifier corresponding to random access data transmission, and the received power of the reference signal is greater than the power threshold, the second data is sent to the access network device through a two-step random access procedure ;or

When it is determined that the identifier of the target data transmission mode is the identifier corresponding to the random access process, and the received power of the reference signal is greater than the power threshold, after the RRC inactive state is restored to the RRC connected state through the two-step random access process, sending second data to the access network device; or

When it is determined that the identifier of the target data transmission mode is the identifier corresponding to the random access data transmission, and the received power of the reference signal is less than or equal to the power threshold, send a fourth random access procedure to the access network device through a four-step random access procedure. 2. Data; or

When it is determined that the identifier of the target data transmission mode is the identifier corresponding to the random access process, and the received power of the reference signal is less than or equal to the power threshold, recover from the RRC inactive state to the RRC connected state through the four-step random access process Then, the second data is sent to the access network device.
The method according to any one of claims 4-7, wherein the transmission indication information further comprises: a contention-free random access resource indication;

The contention-free random access resource indication is used to indicate resources used in the two-step random access procedure or the four-step random access procedure.
The method of claim 8, wherein the contention-free random access resource indication comprises at least one of the following index values:

random access preamble index value, synchronization signal block index value, physical random access channel opportunity RO resource index value or RO resource index value range;

The random access preamble index value is carried in the fourth field of the transmission indication information; the synchronization signal block index value is carried in the fifth field of the transmission indication information, the RO resource index value or RO The resource index value range is carried in the sixth field of the transmission indication information.
The method according to claim 9, wherein the contention-free random access resource indication further comprises: a physical uplink shared channel opportunity PO indication, the PO indication is used to indicate that during the two-step random access process The uplink shared channel used, the PO indication is carried in the seventh field of the transmission indication information.
The method according to any one of claims 2-10, wherein, if the transmission indication information includes a correct response response of the first data; the transmission indication information to the access The network device sends the second data, including:

Send the second data to the access network device through the process of sending the first data;

If the transmission indication information does not include a correct response response for the first data, the sending second data to the access network device according to the transmission indication information includes:

Send the second data to the access network device through the process of sending the first data; wherein the second data is the same as the first data, or the second data and the first data The information bits of the data are the same, or the valid information of the second data and the first data are the same, or the second data is a redundant version of the first data.
The method according to any one of claims 2-11, wherein when the transmission indication information includes the PDSCH scheduling information, the receiving, according to the transmission indication information, the first data sent by the access network device Three data, including:

Determine the PDSCH scheduled by the transmission indication information according to the PDSCH scheduling information;

The third data is received on the PDSCH scheduled by the transmission indication information.
The method according to claim 12, wherein the transmission indication information further comprises: a feedback power control indication, wherein the feedback power control indication is used to indicate transmission power for transmitting the feedback information corresponding to the PDSCH, and the feedback The power control indication is carried in the eighth field of the transmission indication information, and when the value of the eighth field is different, the feedback power control indication is used to indicate different transmit powers.
The method according to claim 13, wherein, if the transmission indication information does not include the correct response response of the first data and the power control indication, when receiving the transmission from the access network device After the instructions, it also includes:

receiving radio resource control RRC signaling sent by the access network device, where the RRC signaling includes configuration information instructing the terminal device to use the feedback power control indication as a power control indication;

The sending the second data to the access network device according to the transmission indication information includes:

determining the transmission power indicated by the feedback power control indication according to the value of the eighth field in the transmission indication information;

The second data is sent to the access network device according to the transmission power indicated by the feedback power control indication.
The method of claim 14, wherein the RRC signaling includes a correct response response of the first data; or

After the receiving the transmission indication information from the access network device, the method further includes:

A medium access control MAC control element CE sent by the access network device is received, where the MAC CE includes a correct response response of the first data.
The method according to claim 2, wherein the PUSCH scheduling information is retransmission PUSCH scheduling information or newly transmitted PUSCH scheduling information;

When the PUSCH scheduling information is retransmission PUSCH scheduling information, the sending second data to the access network device according to the transmission indication information includes:

Send the second data to the access network device on the PUSCH scheduled by the retransmitted PUSCH scheduling information, where the second data is the same as the first data, or the second data is the same as the first data The information bits of the first data are the same, or the valid information of the second data and the first data are the same, or the second data is a redundant version of the first data;

When the PUSCH scheduling information is newly transmitted PUSCH scheduling information, the sending second data to the access network device according to the transmission indication information includes:

The second data is sent to the access network device on the PUSCH scheduled by the newly transmitted PUSCH scheduling information.
The method according to any one of claims 2-16, wherein when the transmission instruction information includes the timing advance adjustment instruction, the timing advance adjustment instruction is carried in the ninth part of the transmission instruction information on the field.
The method according to claim 17, wherein before sending the second data to the access network device or receiving the third data sent by the access network device according to the transmission indication information, the method further comprises: :

A target timing advance is determined according to the timing advance adjustment instruction, and the timing advance is adjusted according to the target timing advance.
The method according to any one of claims 2-18, wherein when the transmission indication information includes the modulation and coding strategy adjustment indication, the modulation and coding strategy adjustment indication is carried in the transmission indication information. Regarding the tenth field, when the values of the tenth field are different, the modulation and coding strategy adjustment indication is used to indicate different modulation and coding strategies.
The method according to claim 19, wherein before sending the second data to the access network device or receiving the third data sent by the access network device according to the transmission indication information, the method further comprises: :

The modulation and coding strategy is adjusted according to the modulation and coding strategy adjustment instruction.
A data transmission method, characterized in that the method comprises:

receiving the first data sent by the terminal device in the RRC inactive state process through the preconfigured authorization resource;

Sending transmission indication information to the terminal device, where the transmission indication information is used to instruct the terminal device to switch the data transmission mode or continue data transmission;

Receive second data sent by the terminal device, or send third data to the terminal device.
A data transmission method, characterized in that the method comprises:

The terminal device sends a random access request to the access network device in the process of RRC inactive state;

receiving transmission indication information from the access network device, where the transmission indication information is used to indicate the mode and/or resource of data transmission;

Data transmission is performed according to the transmission indication information.
The method of claim 22, wherein the transmission indication information includes at least one of the following:

Transmission mode switching indication, resource indication, beam indication;

Wherein, the transmission mode switching instruction is used to indicate that after the random access process or the random access data transmission ends, switch to the authorization-free scheduling data transmission;

The resource indication is used to indicate the pre-configured authorized resources during the authorization-free scheduling of data transmission;

The beam indication is used to indicate the correspondence between the synchronization signal block and the preconfigured grant resource.
The method according to claim 23, wherein when the transmission indication information includes the transmission mode switching indication, the transmission indication information is carried in the first field of the transmission indication information;

The performing data transmission according to the transmission indication information includes:

After determining that the random access process or the random access data transmission is over, use the pre-configured authorized resources to perform authorization-free scheduling data transmission;

Wherein, the random access data transmission is a two-step random access data transmission or a four-step random access data transmission, and the random access process is a two-step random access process or a four-step random access process.
The method according to claim 23 or 24, wherein when the transmission indication information includes the resource indication, the resource indication is carried in the second field of the transmission indication information, wherein the first The two fields have different values, and the resource indication is used to indicate activation of different preconfigured authorized resources.
The method according to any one of claims 22 to 24, wherein when the transmission indication information includes the beam indication, the beam indication is carried in a third field of the transmission indication information, wherein: When the value of the third field is different, the beam indication is used to indicate the correspondence between different synchronization signal blocks and the preconfigured grant resource.
The method according to any one of claims 22 to 26, wherein the receiving the transmission indication information from the access network device comprises:

Receive downlink control information sent by the access network device, where the downlink control information includes the transmission indication information.
The method of claim 27, wherein the transmission indication information is carried in a reserved field in the downlink control information.
The method according to any one of claims 22 to 26, wherein the receiving the transmission indication information from the access network device comprises:

Receive downlink control information sent by the access network device, and receive the transmission indication information on the physical downlink shared channel PDSCH scheduled by the downlink control information; or

Receive random access response information sent by the access network device, where the random access response information includes the transmission indication information, and the random access response information is carried on the PDSCH; or

Receive conflict resolution information sent by the access network device, where the conflict resolution information includes the transmission indication information, and the conflict resolution information is carried on the PDSCH; or

Receive radio resource control RRC signaling sent by the access network device, where the RRC signaling includes the transmission indication information, and the RRC signaling is carried on the PDSCH.
The method according to claim 29, wherein, the medium access control (MAC) control element CE is carried on the PDSCH.
The method of claim 30, wherein the transmission indication information is carried on an undefined logical channel in the MAC CE.
The method according to any one of claims 22 to 31, wherein the transmission indication information further comprises: a contention-free random access resource indication;

The contention-free random access resource indication is used to indicate resources used in random access procedures or random access data transmission.
The method of claim 32, wherein the contention-free random access resource indication comprises at least one of the following index values:

random access preamble index value, synchronization signal block index value, physical random access channel opportunity RO resource index value or RO resource index value range;

The random access preamble index value is carried in the fourth field of the transmission indication information; the synchronization signal block index value is carried in the fifth field of the transmission indication information, the RO resource index value or RO The resource index value range is carried in the sixth field of the transmission indication information.
The method of claim 33, wherein the contention-free random access resource indication further comprises: a physical uplink shared channel opportunity PO indication, the PO indication is used to indicate a two-step random access procedure or a two-step random access procedure The uplink shared channel used by the terminal device in random access data transmission, and the PO indication is carried in the seventh field of the transmission indication information.
The method according to any one of claims 22 to 34, wherein after receiving the transmission indication information from the access network device, the method further comprises:

Send feedback information corresponding to the transmission indication information to the access network device, where the feedback information is used to feed back whether to accept the transmission indication of the transmission indication information.
A data transmission method, characterized in that the method comprises:

Receive a random access request from a terminal device in an RRC inactive state process;

Sending transmission indication information to the terminal device, where the transmission indication information is used to instruct the terminal device to perform data transmission methods and/or resources.
A communication device, characterized in that it is used for implementing the method according to any one of claims 1-20 or 21 or 22-35 or 36.
A communication device, characterized in that it comprises a processor and a memory, the memory is coupled to the processor, and the processor is configured to execute claims 1-20 or 21 or 22-35 or 36 The method of any of the above.
A computer-readable storage medium, characterized in that, a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a computer, the computer is made to execute claims 1-20 or claim 21 or The method of any of claims 22-35 or claim 36.
A communication system, characterized in that it includes a terminal device and an access network device, wherein the terminal device is configured to execute the method according to any one of claims 1-20 or 22-35, the connection The network access device is used to perform the method of claim 21 or claim 36 .