CN116530191A

CN116530191A - Data transmission method and device

Info

Publication number: CN116530191A
Application number: CN202080107518.9A
Authority: CN
Inventors: 张云昊; 郭英昊; 吴艺群
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2023-08-01
Also published as: WO2022134030A1

Abstract

The application provides a data transmission method and device. In the method, terminal equipment sends first data to access network equipment through pre-configured authorized resources in an RRC inactive state process; then receiving transmission indication information from the access network equipment, wherein the transmission indication information is used for indicating the terminal equipment to switch the data transmission mode or continue data transmission; and the terminal equipment sends the second data to the access network equipment or receives the third data sent by the access network equipment according to the transmission indication information. According to the scheme, the terminal equipment can receive the transmission indication information sent by the access network equipment in the RRC inactive state process, and the terminal equipment can switch the data transmission mode or continue data transmission according to the transmission indication information, so that resource waste caused by blind attempt of switching the data transmission mode by the terminal equipment is avoided, and the data transmission efficiency is improved.

Description

Data transmission method and device

Technical Field

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

Background

In a communication system, after a terminal device accesses an access network device, a radio resource control (radio resource control, RRC) connection is established with the access network device. To save terminal power consumption, the RRC connection may contain three states: RRC connected state, RRC idle state, and RRC inactive state. When the communication requirement exists between the terminal equipment and the access network equipment, the terminal equipment enters an RRC connection state, and when the communication requirement does not exist between the terminal equipment and the access network equipment, the terminal equipment enters an RRC idle state or an RRC inactive state.

When the terminal device is in an RRC inactive state, a preconfigured grant-small data transmission (CG-SDT) based on a grant-free (GF) may be performed, where CG-SDT refers to that the access network device preconfigures a physical uplink shared channel (physical uplink shared channel, PUSCH) for the terminal device for uplink data transmission in a semi-static manner, and when the terminal device has uplink data to be sent to the access network device, the terminal device may directly send data to the access network device using preconfigured PUSCH resources and parameters, without receiving dynamic scheduling (DG) of the access network device again, and without sending a random access preamble to the access network device.

When the terminal device is in the RRC inactive state, packet transmission (RA-SDT) based on a random access procedure may also be performed, for example, msg3 of the terminal device in a four-step random access procedure sends uplink packet data (smalldata, SD) to the access network device.

Disclosure of Invention

The application provides a data transmission method and device, which are used for improving the flexibility of packet data transmission.

In a first aspect, an embodiment of the present application provides a data transmission method, where the method may be applied to a terminal device or a chip in the terminal device, and the method is applied to the terminal device as an example, and the method includes: in the RRC inactive state process, the terminal equipment sends first data to the access network equipment through pre-configuring authorized resources; then receiving transmission indication information from the access network equipment, wherein the transmission indication information is used for indicating the terminal equipment to switch a data transmission mode or continue data transmission; and the terminal equipment sends second data to the access network equipment or receives third data sent by the access network equipment according to the transmission indication information.

In the method, after the terminal equipment sends the first data to the access network equipment through the CG resource in the RRC inactive state process, the terminal equipment can receive the transmission indication information sent by the access network equipment, and the terminal equipment can switch the data transmission mode or continue the current data transmission according to the transmission indication information, so that flexible data transmission is realized, resource waste caused by blind attempt of the terminal equipment to switch the data transmission mode is avoided, and the data transmission efficiency is improved.

Optionally, the access network device sends downlink control information to the terminal device, where the downlink control information includes transmission indication information. The transmission indication information may be downlink control information scrambled by using a radio network temporary identifier configured by the access network device to the terminal device and dedicated to the CG-SDT in the inactive state, for example, the radio network temporary identifier configured by the access network device to the terminal device and dedicated to the CG-SDT may be an SDT-RNTI or a CG-RNTI.

In one possible design, the transmission indication information includes at least one of: a power control instruction, a transmission mode switching instruction, a correct response of the first data, physical Uplink Shared Channel (PUSCH) scheduling information, physical Downlink Shared Channel (PDSCH) scheduling information, a time advance adjustment instruction and a modulation and coding strategy adjustment instruction; wherein the power control instruction is used for indicating the sending power of the second data sent by the terminal equipment; the transmission mode switching instruction is used for instructing the terminal equipment to switch the data transmission mode; the correct response of the first data is used for indicating the access network equipment to receive the first data; the PUSCH scheduling information is used for indicating the terminal equipment to send second data on the scheduled PUSCH; the PDSCH scheduling information is used for indicating the terminal equipment to receive third data on the scheduled PDSCH; the time advance adjustment instruction is used for indicating the terminal equipment to adjust the time advance; the modulation and coding strategy adjustment instruction is used for instructing the terminal equipment to adjust the modulation and coding strategy.

Through the design, the transmission indication information can include at least one of power control indication, transmission mode switching indication, correct response of the first data, physical Uplink Shared Channel (PUSCH) scheduling information, physical Downlink Shared Channel (PDSCH) scheduling information, time advance adjustment indication, modulation and coding strategy adjustment indication, so that the terminal equipment can also switch a data transmission mode and receive PUSCH or PDSCH scheduling information by adjusting the sending power, time advance, modulation and coding strategy and the like in the data transmission process according to the transmission indication information, and the terminal equipment can flexibly perform data transmission.

In one possible design, 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; when the values of the first fields are different, the power control instruction is used for indicating different sending powers; the terminal equipment sends second data to the access network equipment according to the transmission indication information, and the method comprises the following steps: the terminal equipment determines the target sending power indicated by the power control indication according to the value of the first field in the transmission indication information; and the terminal equipment sends the second data to the access network equipment according to the target sending power indicated by the power control instruction.

Through the design, when the transmission indication information comprises the power control indication, the terminal equipment can determine the target transmission power for transmitting the second data to the access network equipment according to the power control indication, so that closed loop power control is realized in the data transmission process, the energy consumption waste caused by the excessively high transmission power is avoided, the interference is increased, and the poor receiving performance caused by the excessively low transmission power is avoided.

In one possible design, when the transmission mode switching instruction is included in the transmission instruction information, the transmission mode switching instruction includes: identification of a target data transmission mode and/or a power threshold; the identification of the target transmission mode is carried in a second field of the transmission indication information, and when the values of the second field are different, the identification of the target transmission mode is used for indicating the identifications of different data transmission modes; the power threshold is a receiving power threshold of the reference signal, the power threshold is carried in a third field of the transmission indication information, and when the values of the third field are different, the values of the power threshold are different.

Through the design, when the transmission indication information comprises the transmission mode switching indication, the terminal equipment can determine the target data mode according to the transmission mode switching indication and switch, so that unnecessary resource expenditure caused by blind attempt of other data transmission modes by the terminal equipment is avoided.

In one 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 equipment determines that the identifier of the target transmission mode is the identifier corresponding to the two-step random access data transmission, the terminal equipment sends the second data to the access network equipment through a two-step random access process; or when the terminal equipment determines that the identifier of the target transmission mode is the identifier corresponding to the two-step random access process, the terminal equipment sends the second data to the access network equipment after recovering from the RRC inactive state to the RRC connection state through the two-step random access process; or when the terminal equipment determines that the identifier of the target transmission mode is the identifier corresponding to the four-step random access data transmission, the terminal equipment sends the second data to the access network equipment through a four-step random access process; or when the terminal equipment determines that the identifier of the target transmission mode is the identifier corresponding to the four-step random access process, the terminal equipment sends the second data to the access network equipment after recovering from the RRC inactive state to the RRC connection state through the four-step random access process.

In one possible design, when the transmission mode switching instruction includes the power threshold, the terminal device sends the second data to the access network device according to the transmission instruction information, including: the terminal equipment determines the power threshold according to the value of a third field in the transmission indication information; when the terminal equipment determines that the reference signal receiving power is larger than the power threshold, the terminal equipment sends the second data to the access network equipment through a two-step random access process, or the terminal equipment sends the second data to the access network equipment after recovering from an RRC inactive state to an RRC connected state through the two-step random access process; or when the terminal equipment determines that the reference signal receiving power is smaller than or equal to the power threshold, the terminal equipment sends the second data to the access network equipment through a four-step random access process, or after the terminal equipment returns from an RRC inactive state to an RRC connected state through a four-step random access process, the terminal equipment sends the second data to the access network equipment.

In one possible design, when the transmission mode switching indication includes the identifier of the target data transmission mode and the power threshold, the terminal device sends the second data to the access network device according to the transmission indication information, including: the terminal equipment determines the power threshold according to the value of a third field in the transmission indication information; when the terminal equipment determines that the identifier of the target data transmission mode is the identifier corresponding to the random access data transmission and the reference signal receiving power is larger than the power threshold, the terminal equipment sends second data to the access network equipment through a two-step random access process; or when the terminal equipment determines that the identifier of the target data transmission mode is the identifier corresponding to the random access process and the reference signal receiving power is larger than the power threshold, the terminal equipment sends second data to the access network equipment after recovering from the RRC inactive state to the RRC connection state through the two-step random access process; or when the terminal equipment determines that the identifier of the target data transmission mode is the identifier corresponding to the random access data transmission and the reference signal receiving power is smaller than or equal to the power threshold value, the terminal equipment sends second data to the access network equipment through a four-step random access process; or when the terminal equipment determines that the identifier of the target data transmission mode is the identifier corresponding to the random access process and the reference signal receiving power is smaller than or equal to the power threshold, the terminal equipment returns from the RRC inactive state to the RRC connection state through the four-step random access process and then sends second data to the access network equipment.

Through the design, the transmission mode switching indication can comprise the identification and/or the power threshold of the target data transmission mode, the terminal equipment can determine the corresponding target data transmission mode of the transmission mode switching indication through the identification and/or the power threshold of the target data transmission mode and switch, and the determined target data transmission mode 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 equipment can be accurately switched to the target data transmission mode, and the flexibility of data transmission is improved.

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

In one 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, a physical random access channel opportunity RO resource index value or an RO resource index value range; the random access preamble index value is carried in a fourth field of the transmission indication information; the synchronization signal block index value is carried in a fifth field of the transmission indication information, and the RO resource index value or the RO resource index value range is carried in a sixth field of the transmission indication information.

In one possible design, the contention-free random access resource indication further includes: and the PO indication is used for indicating the uplink shared channel used by the terminal equipment in the two-step random access process, and is carried in a seventh field of the transmission indication information.

With the above design, the transmission indication information may further include a contention-free random access resource indication, and the terminal device may determine contention-free random access resources used when switching to the random access procedure or random access data transmission according to the contention-free random access resource indication.

In one possible design, if the transmission indication information includes a correct response of the first data; the terminal equipment sends second data to the access network equipment according to the transmission indication information, and the method comprises the following steps: the terminal equipment sends the second data to the access network equipment through the process of sending the first data; if the transmission indication information does not include the correct response of the first data, the terminal device sends second data to the access network device according to the transmission indication information, including: the terminal equipment sends the second data to the access network equipment through the process of sending the first data; wherein the second data is identical to the first data, or the second data and the first data have the same information bit, or the second data and the first data have the same valid information, or the second data is a redundancy version of the first data.

Through the design, the terminal equipment can determine whether to retransmit the first data according to whether the transmission indication information comprises the correct response of the first data, and when the transmission indication information comprises the correct response of the first data, the terminal equipment determines that the access network equipment has correctly received the first data, and can continue to send the second data to the access network equipment through the process of sending the first data; and when the transmission indication information does not comprise the correct response of the first data, the terminal equipment sends the second data on the process of the first data, and the sent second data is the same as the first data, the information bits are the same, the effective information is the same or the second data is a redundancy version of the first data, so that the reliability of data transmission is improved.

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

In one 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 equipment determines the PDSCH scheduled by the transmission indication information according to the PDSCH scheduling information; the terminal device receives the third data on the PDSCH scheduled by the transmission instruction information.

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

In one possible design, the transmission instruction information further includes: and the feedback power control instruction is used for indicating the sending power of feedback information corresponding to the PDSCH sent by the terminal equipment, and is carried in an eighth field of the transmission instruction information, and when the values of the eighth field are different, the feedback power control instruction is used for indicating different sending powers.

Through the design, when the transmission indication information comprises the feedback power control indication, the terminal equipment can determine the transmission power of the feedback information corresponding to the PDSCH transmitted by the terminal equipment according to the feedback power control indication, and transmit the feedback information corresponding to the PDSCH to the access network equipment by using the transmission power, so that the transmission performance of the feedback information is improved.

In one possible design, if the transmission indication information does not include the correct response of the first data and the power control indication, after the terminal device receives the transmission indication information from the access network device, the method further includes: the terminal equipment receives a Radio Resource Control (RRC) signaling sent by the access network equipment, wherein the RRC signaling comprises configuration information for indicating the terminal equipment to take the feedback power control indication as a power control indication; the terminal equipment sends second data to the access network equipment according to the transmission indication information, and the method comprises the following steps: the terminal equipment determines the sending power indicated by the feedback power control indication according to the value of the eighth field in the transmission indication information; and the terminal equipment sends the second data to the access network equipment according to the sending power indicated by the feedback power control instruction.

Through the design, when the transmission indication information does not comprise the correct response of the first data and the power control indication, the access network device can instruct the terminal device to take the feedback power control indication as the power control indication through RRC signaling, the terminal device can determine the sending power according to the feedback power control indication and send the second data to the access network device by using the sending power, and the cost of the transmission indication information is saved by multiplexing the feedback power control indication and the power control indication.

In one possible design, the RRC signaling includes a correct acknowledgement response of the first data; or after the terminal device receives the transmission indication information from the access network device, the method further comprises: and the terminal equipment receives a Media Access Control (MAC) Control Element (CE) sent by the access network equipment, wherein the MAC CE comprises a correct response of the first data.

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

In one possible design, the PUSCH scheduling information is retransmission PUSCH scheduling information or new PUSCH scheduling information; when the PUSCH scheduling information is retransmission PUSCH scheduling information, the terminal device sends second data to the access network device according to the transmission indication information, including: the terminal equipment sends the second data to the access network equipment on the PUSCH scheduled by the retransmission 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 effective information of the second data and the first data is the same, or the second data is a redundancy version of the first data; when the PUSCH scheduling information is new PUSCH scheduling information, the terminal device sends second data to the access network device according to the transmission instruction information, including: and the terminal equipment sends the second data to the access network equipment on the PUSCH scheduled by the PUSCH scheduling new transmission information.

Through the design, when the transmission indication information comprises the PUSCH scheduling information, the PUSCH scheduling information can be retransmitted or newly transmitted, and the terminal equipment can determine to retransmit the first data on the scheduled PUSCH or transmit the second data on the scheduled PUSCH according to the PUSCH scheduling information, so that the uplink packet data transmission is realized, and the accuracy of the data transmission is improved.

In one possible design, when the transmission indication information includes the time advance adjustment indication, the time advance adjustment indication is carried on a ninth field of the transmission indication information.

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

In one possible design, before 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, the method further includes: and the terminal equipment determines a target time advance according to the time advance adjustment instruction, and adjusts the time advance of the terminal equipment according to the target time advance.

Optionally, the target time advance or the relative time advance may be included in the time lift adjustment instruction.

Through the design, the transmission indication information can also comprise a time advance adjustment indication, and the terminal equipment can adjust the time advance according to the time advance adjustment indication so as to keep uplink synchronization with the access network equipment.

Optionally, after the terminal device receives the TA adjustment instruction and performs TA adjustment according to the TA adjustment instruction, the TA validity timer may be restarted. And if the TA validity timer is not overtime, the TA of the terminal equipment is valid, otherwise, the TA of the terminal equipment is invalid.

In one possible design, when the transmission indication information includes the modulation and coding strategy adjustment indication, the modulation and coding strategy adjustment indication is carried on a tenth field of the transmission indication information, and when the tenth field has a different value, the modulation and coding strategy adjustment indication is used for indicating different modulation and coding strategies.

In one possible design, before 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, the method further includes: and the terminal equipment adjusts the modulation and coding strategy of the terminal equipment according to the modulation and coding strategy adjustment instruction.

With the above design, the transmission indication information may further include a modulation and coding strategy adjustment indication, and the terminal device may adjust the modulation and coding strategy according to the modulation and coding strategy adjustment indication to adjust the data transmission block size.

In a second aspect, an embodiment of the present application provides a data transmission method, where the method may be applied to an access network device or a chip in the access network device, and the method is applied to the access network device as an example, and the method includes: the access network equipment receives first data sent by the terminal equipment in the RRC inactive state process through the pre-configured authorized resources; then the access network equipment sends transmission indication information to the terminal equipment, wherein the transmission indication information is used for indicating the terminal equipment to switch a data transmission mode or continue data transmission; and the access network equipment receives the second data sent by the terminal equipment or sends the third data to the terminal equipment.

By the method, after the access network equipment receives the first data sent by the terminal equipment in the RRC inactive state process through the pre-configured authorized resources, the access network equipment sends transmission indication information to the terminal equipment so as to indicate the terminal equipment to switch the data transmission mode or continue data transmission, flexible data transmission is realized, resource waste caused by blind attempt of switching the data transmission mode by the terminal equipment is avoided, and data transmission efficiency is improved.

Through the design, the transmission indication information can include at least one of power control indication, transmission mode switching indication, correct response of the first data, physical Uplink Shared Channel (PUSCH) scheduling information, physical Downlink Shared Channel (PDSCH) scheduling information, time advance adjustment indication, modulation and coding strategy adjustment indication, so that the access network equipment can instruct the terminal equipment to adjust the sending power, time advance, modulation and coding strategy and the like in the data transmission process by sending the transmission indication information to the terminal equipment, and can instruct the terminal equipment to switch the data transmission mode and instruct the terminal equipment to carry out PUSCH or PDSCH scheduling information, thereby enabling the terminal equipment to flexibly carry out data transmission.

In one possible design, 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; and when the values of the first fields are different, the power control instruction is used for indicating different sending powers.

Through the design, when the transmission indication information comprises the power control indication, the access network equipment indicates the target transmission power of the second data to the terminal equipment through the power control indication, so that closed loop power control is realized in the data transmission process, the energy consumption waste caused by the excessively high transmission power is avoided, the interference is increased, and the poor receiving performance caused by the excessively low transmission power is avoided.

In one possible design, when the transmission mode switching instruction is included in the transmission instruction information, the transmission mode switching instruction includes: identification of a target data transmission mode and/or a power threshold; the identification of the target transmission mode is carried in a second field of the transmission indication information, and when the values of the second field are different, the target transmission mode is used for indicating different data transmission modes; the power threshold is a receiving power threshold of the reference signal, the power threshold is carried in a third field of the transmission indication information, and when the values of the third field are different, the values of the power threshold are different.

In one possible design, the access network device receives second data sent by the terminal device, including: the access network equipment receives second data sent by the terminal equipment through a two-step random access process or a four-step random access process; or the access network equipment receives the second data sent after the terminal equipment is recovered from the RRC inactive state to the RRC connection state through a two-step random access process or a four-step random access process.

Through the design, when the transmission indication information comprises the transmission mode switching indication, the access network equipment can indicate the target data mode to the terminal equipment through the transmission mode switching indication, so that unnecessary resource expenditure caused by blind attempt of other data transmission modes by the terminal equipment is avoided.

In one possible design, the contention-free random access resource indication further includes: and the Physical Uplink Shared Channel (PUSCH) opportunity (PO) indication is used for indicating an uplink shared channel used in the two-step random access process, and the PO indication is carried in a seventh field of the transmission indication information.

With the above design, the transmission indication information may further include a contention-free random access resource indication, and the access network device may indicate to the terminal device the contention-free random access resource used by the terminal device in the random access procedure or the random access data transmission.

In one possible design, when the transmission indication information includes a correct response of the first data, the access network device receives second data sent by the terminal device, including: the access network equipment receives the second data sent by the terminal equipment through the process of sending the first data; and when the transmission indication information does not comprise the correct response of the first data, the access network equipment receives second data sent by the terminal equipment, and the method comprises the following steps: the access network equipment receives second data sent by the terminal equipment through a process of sending the first data; wherein the second data is identical to the first data, or the second data and the first data have the same information bit, or the second data and the first data have the same valid information, or the second data is a redundancy version of the first data.

Through the design, when the access network equipment determines that the first data is correctly received, the access network equipment sends a correct response of the first data to the terminal equipment through the transmission indication information, and when the access network equipment determines that the first data is not correctly received, the transmission indication information does not comprise the correct response of the first data, so that the access network equipment is instructed to resend the first data, and further the reliability of data transmission is improved.

In one possible design, when the transmission indication information includes the PDSCH scheduling information, the access network device sends third data to the terminal device, including: and the access network equipment sends the third data to the terminal equipment on the PDSCH scheduled by the PDSCH scheduling information.

In one 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 send the sending power of the feedback information corresponding to the PDSCH; and the feedback power control instruction is carried in an eighth field of the transmission instruction information, and when the values of the eighth field are different, the feedback power control instruction is used for indicating different sending powers.

Through the design, when the transmission indication information comprises the feedback power control indication, the access network equipment can indicate the transmission power of the feedback information corresponding to the PDSCH to the terminal equipment through the feedback power control indication, so that the terminal equipment can use the transmission power to transmit the feedback information corresponding to the PDSCH to the access network equipment, and the data transmission performance is improved.

In one possible design, when the transmission indication information does not include the correct response of the first data and the power control indication, after the access network device sends the transmission indication information to the terminal device, the method further includes: and the access network equipment sends a Radio Resource Control (RRC) signaling to the terminal equipment, wherein the RRC signaling contains configuration information for indicating the terminal equipment to take the feedback power control indication as a power control indication.

In one possible design, the RRC signaling includes a correct acknowledgement response of the first data; or after the access network device sends the transmission indication information to the terminal device, the method further comprises: and the access network equipment sends a Media Access Control (MAC) Control Element (CE) to the terminal equipment, wherein the MAC CE comprises a correct response corresponding to the first data.

Through the above design, the access network device can send the correct response of the first data to the terminal device through RRC signaling or MAC CE.

In one possible design, the PUSCH scheduling information is retransmission PUSCH scheduling information or new PUSCH scheduling information; when the PUSCH scheduling information is retransmission PUSCH scheduling information, the access network device receives second data sent by the terminal device, including: the access network equipment receives second data sent by the terminal equipment on the PUSCH scheduled by the retransmission 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 effective information of the second data and the first data is the same, or the second data is a redundancy version of the first data; when the PUSCH scheduling information is new PUSCH scheduling information, the access network device receives second data sent by the terminal device, including: and the access network equipment receives the second data sent by the terminal equipment on the PUSCH scheduled by the retransmission PUSCH scheduling information.

Through the design, when the transmission indication information comprises the PUSCH scheduling information, the PUSCH scheduling information can be retransmission PUSCH scheduling information or new transmission PUSCH scheduling information, and the access network equipment can send the retransmission PUSCH scheduling information to the terminal equipment through the transmission indication information so as to instruct the terminal equipment to resend the first data on the scheduled PUSCH, or send the new transmission PUSCH scheduling information to the terminal equipment so as to instruct the terminal equipment to send the second data on the scheduled PUSCH, so that uplink packet data transmission is realized, and the accuracy of data transmission is improved.

Through the design, the access network equipment can send the time advance adjustment instruction to the terminal equipment through the transmission instruction information so as to enable the terminal equipment to adjust the time advance, and uplink synchronization between the terminal equipment and the access network equipment is maintained.

In one possible design, when the transmission indication information includes the modulation and coding scheme adjustment indication, the modulation and coding scheme adjustment indication is carried on a tenth field of the transmission indication information, and when the tenth field has a different value, the modulation and coding scheme adjustment indication is used to indicate a different modulation and coding scheme.

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

In a third aspect, an embodiment of the present application provides a second data transmission method, where the method may be applied to a terminal device or a chip in the terminal device, and the method is applied to the terminal device as an example, and the method includes: in the RRC inactive state process, the terminal equipment sends a random access request to the access network equipment; then the terminal equipment receives transmission indication information from the access network equipment, wherein the transmission indication information is used for indicating the mode and/or the resource of the terminal equipment for data transmission; and the terminal equipment performs data transmission according to the transmission indication information.

By the method, the terminal equipment can receive the transmission indication information sent by the access network equipment in the RRC inactive state process, and the terminal equipment can determine the data transmission mode and/or the resources according to the transmission indication information without acquiring the reconfigured resources and switching the data transmission mode after the terminal equipment is recovered from the RRC inactive state to the RRC connection state, so that the resource cost is saved and the flexibility of data transmission is improved.

In one possible design, the transmission indication information includes at least one of: a transmission mode switching instruction, a resource instruction and a beam instruction; the transmission mode switching instruction is used for indicating the terminal equipment to switch to the unlicensed scheduling data transmission after the random access process or the random access data transmission is finished; the resource indication is used for indicating the pre-configured authorized resource when the terminal equipment performs the unlicensed scheduling data transmission; the beam indication is used for indicating the corresponding relation between the synchronous signal block and the pre-configured authorized resource.

Through the design, the transmission indication information can comprise at least one of transmission mode switching indication, resource indication and beam indication, so that the terminal equipment is instructed to flexibly perform data transmission.

In one possible design, when the transmission mode switching instruction is included in the transmission instruction information, the transmission instruction information is carried in a first field of the transmission instruction information; the terminal equipment performs data transmission according to the target indication information, and the method comprises the following steps: after the terminal equipment determines that the random access process or the random access data transmission is finished, using a pre-configured authorized resource to perform the unlicensed scheduling data transmission; the random access data transmission is two-step random access data transmission or four-step random access data transmission, and the random access process is two-step random access process or four-step random access process.

Through the design, the transmission indication information can comprise the transmission mode switching indication, the terminal equipment can determine whether to perform the unlicensed scheduling data transmission or not after the random access process or the random access data transmission is finished according to the transmission mode switching indication, and the terminal equipment is not required to acquire the reconfigured resources and switch the data transmission mode after recovering from the RRC inactive state to the RRC connection state, so that the resource cost is saved.

In one 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, where the second field has a different value, and the resource indication is used to indicate activation of a different preconfigured grant resource.

Through the design, the transmission indication information can comprise the resource indication, and the terminal equipment can determine the pre-configured authorized resource activated by the resource indication according to the resource indication so as to be used when the terminal equipment performs unlicensed scheduling data transmission.

In one 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, where the third field has a different value, the beam indication is used to indicate a correspondence between different synchronization signal blocks and the preconfigured grant resources.

Through the design, the transmission indication information can comprise beam indication, and the terminal equipment can determine the corresponding relation between different synchronous signal blocks and the pre-configured authorized resources according to the beam indication, so that the terminal equipment can determine the synchronous signal blocks corresponding to the pre-configured authorized resources when using the pre-configured authorized resources, and the signal quality during data transmission is improved.

In one possible design, the terminal device receives transmission indication information from the access network device, including: and the terminal equipment receives downlink control information sent by the access network equipment, wherein the downlink control information comprises the transmission indication information.

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

Through the design, the transmission indication information can be contained in the downlink control information, so that resource overhead is saved.

In one possible design, the terminal device receives transmission indication information from the access network device, including: the terminal equipment receives downlink control information sent by the access network equipment and receives the transmission indication information on a Physical Downlink Shared Channel (PDSCH) scheduled by the downlink control information; or the terminal equipment receives random access response information sent by the access network equipment, wherein the random access response information comprises the transmission indication information, and the random access response information is borne on the PDSCH; or the terminal equipment receives conflict resolution information sent by the access network equipment, wherein the conflict resolution information comprises the transmission indication information, and the conflict resolution information is borne on the PDSCH; or the terminal equipment receives the Radio Resource Control (RRC) signaling sent by the access network equipment, wherein the RRC signaling comprises the transmission indication information, and the RRC signaling is borne on the PDSCH.

In one possible design, the PDSCH carries a medium access control, MAC, control element, CE.

In one possible design, the transmission indication information is carried on logical channels that are undefined in the MAC CE.

Through the design, the transmission indication information can be borne on the PDSCH scheduled by the downlink control information, or can be contained in the random access response information, the conflict resolution information or the RRC signaling, so that various transmission modes of the transmission indication information are provided.

In one possible design, the transmission instruction information further includes: a contention-free random access resource indication; the contention-free random access resource indication is used to indicate resources used by the terminal device in a random access procedure or random access data transmission.

In one possible design, the contention-free random access resource indication further includes: and the PO indication is used for indicating an uplink shared channel used by the terminal equipment in a two-step random access process or a two-step random access data transmission, and is carried in a seventh field of the transmission indication information.

With the above design, the transmission indication information may further include a contention-free random access resource indication, and the terminal device may determine a contention-free random resource used in the random access procedure or the random access data transmission according to the contention-free random access resource indication.

In one possible design, after the terminal device receives the transmission indication information from the access network device, the method further includes: and the terminal equipment sends feedback information corresponding to the transmission indication information to the access network equipment, wherein the feedback information is used for feeding back whether the terminal equipment accepts the transmission indication of the transmission indication information.

Through the design, the terminal equipment can feed back whether to accept the transmission indication of the transmission indication information or not to the access network equipment after receiving the transmission indication information.

In a fourth aspect, an embodiment of the present application provides a second data transmission method, where the method may be applied to an access network device or a chip in the access network device, and taking the application of the method to the access network device as an example, the method includes: the access network equipment receives a random access request from the terminal equipment in the RRC inactive state process; the access network equipment sends transmission indication information to the terminal equipment, wherein the transmission indication information is used for indicating a mode and/or a resource of the terminal equipment for data transmission.

According to the method, after the access network equipment receives the random access request sent by the terminal equipment in the RRC inactive state process, the access network equipment can send transmission indication information to the terminal equipment, so that the terminal equipment is indicated to perform data transmission mode and/or resource in the random access process of the terminal equipment, the terminal equipment is not required to acquire the reconfigured resource and switch the data transmission mode after recovering from the RRC inactive state to the RRC connection state, resource expenditure is saved, and meanwhile, the flexibility of data transmission is improved.

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

Through the design, the transmission indication information can comprise the transmission mode switching indication, and the access network equipment can instruct the terminal equipment to switch to the unlicensed scheduling data transmission through the transmission indication information when the terminal equipment is in the RRC inactive state, so that the terminal equipment is not required to acquire the reconfigured resources and switch the data transmission mode after recovering from the RRC inactive state to the RRC connection state, and resource expenditure is saved.

Through the design, the transmission indication information can comprise resource indication, and the access network equipment can indicate the activated pre-configured authorized resource to the terminal equipment through the resource indication so as to be used when the terminal equipment performs unlicensed scheduling data transmission.

Through the design, the transmission indication information can comprise beam indication, and the access network equipment can send the corresponding relation between the synchronous signal blocks and the pre-configured authorized resources to the terminal equipment through the beam indication, so that the terminal equipment determines the synchronous signal blocks corresponding to the pre-configured authorized resources when using the pre-configured authorized resources, and the signal quality during data transmission is improved.

In one possible design, the sending, by the access network device, transmission indication information to the terminal device includes: the access network device sends downlink control information to the terminal device, wherein the downlink control information comprises the transmission indication information.

In one possible design, the sending, by the access network device, transmission indication information to the terminal device includes: the access network equipment sends downlink control information to the terminal equipment, and sends the transmission indication information on a physical downlink shared channel PDSCH scheduled by the downlink control information; or the access network equipment sends random access response information to the terminal equipment, wherein the random access response information comprises the transmission indication information, and the random access response information is borne on the PDSCH; or the access network equipment sends conflict resolution information to the terminal equipment, wherein the conflict resolution information comprises the transmission indication information, and the conflict resolution information is borne on the PDSCH; or the access network equipment sends Radio Resource Control (RRC) signaling to the terminal equipment, wherein the RRC signaling comprises the transmission indication information, and the RRC signaling is borne on the PDSCH.

With the above design, the transmission indication information may further include a contention-free random access resource indication, and the access network device may indicate to the terminal device, through the transmission indication information, a contention-free random resource used by the terminal device in a random access procedure or random access data transmission.

In one possible design, after the access network device sends the transmission indication information to the terminal device, the method further includes: the access network equipment receives feedback information corresponding to the transmission indication information from the terminal equipment, wherein the feedback information is used for feeding back whether the terminal equipment accepts the transmission indication of the transmission indication information.

Through the design, the access network equipment can acquire whether the terminal equipment accepts the transmission instruction of the transmission instruction information or not through the feedback information corresponding to the transmission instruction information sent by the terminal equipment.

In a fifth aspect, embodiments of the present application provide a communication apparatus comprising means for performing the steps of any of the above aspects.

In a sixth aspect, embodiments of the present application provide a communications apparatus that includes a processor, a memory, and a communications interface, where the memory is configured to store instructions and data, and the communications interface is configured to communicate the apparatus with other devices, where the communications interface may be, for example, a transceiver, a circuit, a bus, a module, or another type of communications interface, where the other devices may be access network devices when the communications apparatus is applied to a terminal device, and where the other devices may be terminal devices when the communications apparatus is applied to an access network device.

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

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

In an eighth aspect, embodiments of the present application further provide a computer program, which when run on a computer causes the computer to perform the method provided in any one of the above aspects.

In a ninth aspect, embodiments of the present application further provide a computer readable storage medium having a computer program stored therein, which when executed by a computer, causes the computer to perform the method provided in any of the above aspects.

In a tenth aspect, embodiments of the present application further provide a chip, where the chip is configured to read a computer program stored in a memory, and perform the method provided in any one of the above aspects.

In an eleventh aspect, embodiments of the present application further provide 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 above aspects. In one possible design, the chip system further includes a memory for storing programs and data necessary for the computer device. The chip system may be formed of a chip or may include a chip and other discrete devices.

Drawings

Fig. 1 is a schematic diagram of a communication system architecture according to an embodiment of the present application;

Fig. 2 is an exemplary diagram of an RRC state transition performed by a terminal device;

fig. 3 is a flow chart of a packet data transmission method based on a two-step random access procedure;

fig. 4 is a flowchart of a packet data transmission method based on a four-step random access procedure;

FIG. 5 is a flow chart of a method of pre-configured grant packet transmission based on grant-free scheduling;

fig. 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 a flowchart of a data transmission method provided in example 1 of the present application;

fig. 8 is a flowchart of a data transmission method provided in example 2 of the present application;

fig. 9 is a flowchart of a data transmission method provided in example 3 of the present application;

fig. 10 is a flowchart of a data transmission method provided in example 4 of the present application;

fig. 11 is a flowchart of a data transmission method provided in example 5 of the present application;

fig. 12 is a flowchart of a data transmission method provided in example 6 of the present application;

fig. 13 is a flowchart of a data transmission method provided in example 7 of the present application;

fig. 14 is a flowchart of a data transmission method provided in example 8 of the present application;

fig. 15 is a flowchart of a data transmission method provided in example 9 of the present application;

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

Fig. 17 is a schematic diagram of a first field value and a corresponding relationship between an SSB index value and CG resources according to an embodiment of the present application;

fig. 18 is a schematic diagram of a correspondence relationship between SSB index values and CG resources provided in an embodiment of the present application;

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

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

fig. 21 is a flowchart of a data transmission method when a terminal device has not been switched from an RRC inactive state to an RRC connected state after a random access procedure provided in an embodiment of the present application is ended;

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 device according to an embodiment of the present application.

Detailed Description

The embodiment of the application can be applied to a 5G system or a future mobile communication system.

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

As illustrated in fig. 1, embodiments of the present application provide a communication system architecture including at least one terminal device and a network device, which may include an access network device (RAN device) in a radio access network (radio access network, RAN) and a core network device in a core network.

The terminal device in the communication system shown in fig. 1 may also be referred to as a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), etc., which is an entity on the user side for receiving or transmitting signals, and is used for sending uplink signals to a network device or receiving downlink signals from the network device. Including devices that provide voice and/or data connectivity to users.

For example, the terminal device may be a handheld device having a wireless connection function, or a processing device connected to a wireless modem. The terminal device may communicate with the core network via a radio access network (radio access network, RAN), exchanging voice and/or data with the RAN. The terminal devices may include user devices, V2X terminal devices, wireless terminal devices, mobile terminal devices, device-to-device (D2D) terminal devices, machine-to-machine/machine-type communication (M2M/MTC) terminal devices, internet of things (internet of things, ioT) terminal devices, subscriber units (subscriber units), subscriber stations (subscriber station), mobile stations (mobile stations), remote Stations (APs), remote terminals (access terminals), user agents (user devices), wearable devices, vehicle devices, or the like.

By way of example, and not limitation, in embodiments of the present application, the terminal device may also be a wearable device. The wearable device can also be called as a wearable intelligent device or an intelligent wearable device, and is a generic name for intelligently designing daily wear and developing wearable devices, such as glasses, gloves, watches, clothes, shoes, and the like, by applying wearable technology. The wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also can realize a powerful function through software support, data interaction and cloud interaction. The generalized wearable intelligent device includes full functionality, large size, and may not rely on the smart phone to implement complete or partial functionality, such as: smart watches or smart glasses, etc., and focus on only certain types of application functions, and need to be used in combination with other devices, such as smart phones, for example, various smart bracelets, smart helmets, smart jewelry, etc. for physical sign monitoring.

While the various terminal devices described above, if located on a vehicle (e.g., placed in or mounted to the vehicle), may be considered as in-vehicle terminal devices, the in-vehicle terminal devices may also be referred to as on-board units (OBUs).

The core network device in the communication system shown in fig. 1 is a network element located in the core network, and is used for implementing the functions of the core network, for example, being responsible for connecting the terminal device to different data networks according to a call request or a service request sent by the terminal device through the access network, and services such as charging, mobility management, session management, and the like. The core network may comprise a plurality of core network devices, e.g. the core network comprises a core network device responsible for access and mobility management service functions of the terminal device, a core network device responsible for session management, etc.

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

The access network device in the communication system shown in fig. 1 may be, for example, a Base Station (BS), which may be a device deployed in a radio access network and capable of performing wireless communication with a terminal device. Among them, the base station may have various forms such as macro base station, micro base station, relay station, access point, etc. Illustratively, the base station referred to 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 be noted that, in the embodiment of the present application, the device for implementing the function of the network device may be the network device; or may be a device, such as a system-on-a-chip, capable of supporting the network device to perform this function, which may be installed in the network device.

The technical scheme provided by the embodiment of the application can be applied to wireless communication among communication equipment. Specifically, the method comprises the following steps: 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. In this embodiment of the present application, the term "wireless communication" may also be simply referred to as "communication", and the term "communication" may also be described as "data transmission", "information transmission" or "transmission". It should be noted that, in the embodiment of the present application, "data transmission" may be small data packet (SD) transmission, or may be data transmission without limitation of data size, and if no special description is provided, "data transmission" in the embodiment of the present application indicates small data packet transmission.

The small data packet can be a data packet with the size of 100-300 bytes; alternatively, the small data packet is a data packet that can be completely transmitted in one time slot, taking a 5M bandwidth resource and one time slot of 30kHz SCS as an example, if quadrature phase shift keying (quadrature phase shift keying, QPSK) is used for modulation, one time slot can transmit about 500 bytes; or the user plane data packet and/or the control plane data packet sent when the RRC state of the terminal device is the RRC inactive state may be regarded 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 area of an access network device, and the terminal device can access the access network device and then communicate with the access network device, specifically, the terminal device sends an uplink signal to the access network device and/or receives a downlink signal sent by the access network device. The terminal device may achieve synchronization with the access network device, and acquire system messages, etc. by receiving a synchronization signal block (synchronization signal and PBCH block, SSB). Wherein the primary synchronization signal (primary synchronisation signal, PSS), the secondary synchronization signal (secondary synchronisation signal, SSS) and the physical broadcast channel (physical broadcast channel, PBCH) together form one SSB. The access network device sends one SSB period including multiple SSBs, each SSB corresponds to one beam, and the terminal device can select the SSB with the best or better signal quality according to the beam scanning signal. Wherein, the SSBs may correspond to the same beam or to different beams, respectively.

The terminal device may perform a radio resource control (radio resource control, RRC) establishment procedure with the access network device during or after accessing the access network device, and after an RRC connection is established between the terminal device and the access network device, the RRC state of the terminal device is an RRC connected state, and then the RRC state of the terminal device may be changed in the following states: an RRC IDLE (rrc_idle) state, an RRC CONNECTED (rrc_connected) state, and an RRC INACTIVE (rrc_inactive) state.

Three RRC states of the terminal device are further described below:

1. RRC connected state

When the RRC state of the terminal device is a connection state, RRC connection exists between the terminal device and the access network device, and the terminal device may communicate with the access network device according to dynamic scheduling (DG) of the access network device or unlicensed scheduling (GF) configured by the access network device. Specifically, the terminal device may send the specific data of the terminal device or the unicast data of the terminal device to the access network device through an uplink data channel, such as a physical uplink shared channel (physical uplink shared channel, PUSCH), and/or the terminal device may receive the specific data of the terminal device or the unicast data of the terminal device from the access network device through a downlink data channel, such as a physical downlink shared channel (physical downlink shared channel, PDSCH).

2. RRC idle state

When the RRC state of the terminal device is in an idle state, RRC connection between the terminal device and the access network device is released, and connection between the terminal device and the core network device is released, where the terminal device may receive a broadcast message, a paging message, a system message, and the like from the access network device, but the terminal device cannot perform unicast data transmission with the access network device, for example, the terminal device cannot receive downlink data sent by the access network device through the terminal device specific PDSCH, and the terminal device cannot send uplink data to the access network device through the terminal device specific PUSCH.

3. RRC inactive state

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

Fig. 2 is an exemplary diagram of a terminal device performing a transition in the above 3 RRC states, where the RRC state transition includes the following transition flows:

1, RRC connected state→RRC idle state

For example, the access network device may send an RRC release (RRC close) message to the terminal device, so that the terminal device releases the RRC connection with the access network device and releases the connection with the core network device, and the terminal device transitions from the RRC connected state to the RRC idle state.

2, RRC connected state→RRC inactive state

For example, the access network device may send an RRC suspend (RRC suspend) message or an RRC release (RRC rlase) to the terminal device, so that the terminal device releases the RRC connection with the access network device, but maintains the connection with the core network device, so that the terminal device transitions from the RRC connected state to the RRC inactive state.

3, RRC Idle state→RRC connected state

For example, the terminal device may establish an RRC connection with the access network device through an RRC establishment procedure, and establish a connection with the core network device, so that the terminal device transitions from an RRC idle state to an RRC connected state. The RRC establishment procedure may be triggered by a higher layer of the terminal device, for example, when the terminal device has a transmission requirement of uplink data, the higher layer of the terminal device triggers the RRC establishment procedure. The RRC establishment procedure may also be triggered by the access network device, e.g. when the terminal device is in RRC idle state, the access network device sends a paging message to the terminal device, the paging message containing the identity of the terminal device. Correspondingly, after receiving the paging message from the access network device, the terminal device triggers an RRC establishment procedure.

Specifically, the RRC establishment procedure may include: the terminal device sends an RRC setup 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 setup (RRC Connection setup) message to the terminal device, which means that the access network device agrees to access the terminal device, the RRC state of the terminal device may be converted into an RRC connection state. If the access network device sends an RRC reject (RRC Connection reject) message to the terminal device, meaning that the access network device rejects the access of the terminal device, the RRC state of the terminal device continues to stay in the RRC idle state.

In the embodiment of the present application, the scenario that the higher layer of the terminal device triggers the terminal device to initiate the RRC establishment procedure includes, but is not limited to: the terminal device needs to send uplink data to the access network device. Illustratively, the service data adaptation protocol (service data adaptation protocol, SDAP) layer, packet data convergence layer protocol (packet data convergence protocol, PDCP) layer, and/or radio link control (radio link control, RLC) layer of the terminal device triggers the RRC layer of the terminal device and the access network device to perform an RRC setup procedure, and the RRC layer of the terminal device triggers the medium access control (media access control, MAC) layer of the terminal device and the access network device to perform an access procedure, thereby performing an RRC setup procedure with the access network device during or after the access is completed.

4, RRC inactive state→RRC connected state

For example, when the terminal device is in the RRC inactive state, the RRC connection between the terminal device and the access network device may be established or restored through an RRC establishment or RRC restoration procedure, so that the RRC state of the terminal device is converted into the RRC connection state.

When the terminal device is in the RRC inactive state, after the terminal device receives the paging message from the access network device or after being triggered by a higher layer of the terminal device, the terminal device can initiate an RRC recovery process to attempt to recover the RRC connection with the access network device to enter the RRC connection state. For example, the RRC recovery procedure between the terminal device and the access network device includes: the terminal equipment sends an RRC recovery request (RRC Resume Request) message to the access network equipment, and after receiving the request, the access network equipment sends an RRC establishment (RRC Setup) message or an RRC recovery (RRC recovery) message to the terminal equipment, so that the state of the terminal equipment can be converted into an RRC connection 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 is converted from an RRC inactive state to an RRC idle state; alternatively, the access network device sends an RRC Reject (RRC Reject) message to the terminal device, so that the terminal device continues to stay in an RRC inactive state.

5, RRC inactive state→RRC idle state

For example, 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 an RRC release procedure, so that the terminal device transitions from the RRC inactive state to the RRC idle state.

It should be noted that, for the description of the RRC state of the terminal device, reference may be made to the description of section 5.3 of the third generation partnership project (3rd generation partnership project,3GPP) 5G standard protocol TS38.331 and other relevant sections, but the embodiments of the present application are not limited thereto. For example, the introduction of the RRC state of the terminal device may refer to both currently existing versions of 38.331 and possibly developed versions of 38.331 in the future, or may refer to the introduction of the RRC state of the terminal device described in other standard protocols, textbooks, conference documents, journals, etc.

According to the above, when the terminal device is in the RRC inactive state, the terminal device may receive a broadcast message, a paging message, a system message, or the like from the access network device, or may perform limited unicast data transmission with the access network device, where the access network device retains registration information of the terminal device, but the terminal device suspends most of air interface behaviors between the terminal device and the access network device, such as suspending monitoring of scheduling information, that is, suspending receiving of a physical downlink control channel (physical downlink control channel, PDCCH) sent by the access network device and used for scheduling unicast transmission of the terminal device, suspending sending of scheduling information, suspending RRM (radio resource management ) measurement, suspending of air interface behaviors such as beam maintenance, and the like. It can be seen that, compared with the RRC connected state, the RRC inactive state is a state that saves power for 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 delay and signaling overhead for switching to the RRC connected state.

Before Release 16 standard of 3GPP, the terminal device in RRC inactive state does not support unicast data transmission, i.e. the terminal device needs to restore RRC connection again to enter RRC connection state before unicast data transmission. However, the terminal device has some service scenarios requiring smaller data packet transmission, such as smart phone related services, and may specifically be an instant message in an instant messaging application program, a heartbeat packet of the application program, or a push message; also for example, related services of a non-smart phone, such as periodic data (e.g., heartbeat packets) of a wearable device, periodic readings sent by an industrial wireless sensor network, smart meter data transmission, and so forth. 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. Thus, unicast packet data transmission (small data transmission, SDT) can address the communication needs in these scenarios while reducing signaling overhead and power consumption when the terminal device is in the RRC inactive state.

In a specific implementation, when the terminal device is in an RRC inactive state, packet data transmission may be performed according to the following two manners:

1. Packet data transmission based on random access procedure (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 acquire or recover uplink synchronization. The packet data transmission based on the random access process means that the terminal device sends uplink data to the access network device or receives downlink data sent by the access network device in the random access process. The following describes in detail the packet data transmission based on the two-step random access procedure and the packet data transmission based on the four-step random access procedure, respectively:

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

Referring to fig. 3, the packet data transmission method based on the two-step random access procedure includes two steps of MsgA and MsgB:

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

The Preamble is used for determining a Time Advance (TA) of the terminal device according to the Preamble after the access network device receives the Preamble, and notifying the TA to the terminal device so that the terminal device adjusts uplink synchronization.

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

It should be noted that, the PRACH resource, the Preamble resource, the PUSCH resource (including the demodulation reference signal (demodulation reference signal, DMRS) resource in the PUSCH) and the resource for the terminal device to receive the RAR are all configured to the terminal device by the access network device, and specifically may be a resource configured to be exclusive to the terminal device when the access network device is in the RRC connection state, or may be a resource for the access network device to broadcast contention in a system message.

2. Packet data transmission based on a four-step random access procedure.

Packet data transmission based on the four-step random access procedure may also be referred to as a data early transmission scheme (early data transmission, EDT) to distinguish data transmission performed after the terminal device enters the RRC connected state through the four-step random access procedure.

Referring to fig. 4, the packet data transmission method based on the four-step random access procedure includes the following four steps:

msg1: the terminal device sends a Preamble to the access network device on a Physical Random Access Channel (PRACH) occasion (RO).

Msg2: the access network equipment sends RAR to the terminal equipment, wherein the RAR comprises uplink scheduling information of Msg 3.

Msg3: and the terminal equipment sends the uplink packet data to the access network equipment on the RAR scheduled resource. Optionally, the uplink packet data may include an identifier of the terminal device.

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

The PRACH resource, the Preamble resource, the PUSCH resource (including the DMRS resource in the PUSCH), and the resource of the terminal device for receiving the RAR are configured to the terminal device by the access network device, which may specifically be a resource configured to be exclusive to the terminal device by the access network device when the terminal device is in the RRC connection state, or may be a resource broadcast by the access network device for contention use in a system message.

2. Preconfigured grant-small data transmission (CG-SDT) based on grant-free (GF).

CG-SDT refers to PUSCH resources and corresponding transmission parameters that are preconfigured for terminal devices by the access network device and used for performing uplink data transmission in a semi-static manner, so that when there is uplink data to be transmitted by the terminal device, the terminal device may directly use the preconfigured PUSCH resources and corresponding transmission parameters to send uplink data to the access network device, without receiving dynamic uplink grant (dynamic UL grant) of the access network device, and without sending Preamble to the access network device to enable the terminal device to adjust uplink synchronization.

The preconfigured authorization transmission includes two types of preconfigured authorization means (Type 1CG and Type 2 CG). The Type 1 CG-based data transmission is that an access network device configures a preconfigured grant (CG) resource and a transmission parameter for a terminal device through RRC signaling, for example, the access network device configures one or more of the following information or resources for the terminal device: the time domain resource period, open loop power control related parameters, waveforms, redundancy version sequences, repetition times, frequency hopping patterns, resource allocation types, hybrid automatic repeat (hybrid automatic repeat request, HARQ) process numbers, DMRS related parameters, modulation coding scheme, resource block (resource block group, RBG) group size, time domain resources, frequency domain resources, modulation and coding strategy (modulation and coding scheme, MCS), etc.

In transmission based on Type 2CG, the access network equipment adopts a two-step resource allocation mode: firstly, the access network device issues grant configuration information through RRC signaling, where the grant configuration information is used to configure CG resources and transmission parameters, and specifically may include periods of time domain resources, open loop power control related parameters, waveforms, redundancy version sequences, repetition times, frequency hopping patterns, resource allocation types, HARQ process numbers, DMRS related parameters, MCS tables, RBG group sizes, and the like. The access network device then sends downlink control information (downlink control information, DCI) scrambled with a configuration scheduling radio network temporary identity (configured scheduling radio network temporary identifier, CS-RNTI) to the terminal device to activate Type 2 CG-based PUSCH transmission and simultaneously configure other transmission resources and transmission parameters including time domain resources, frequency domain resources, DMRS sequence indication, MCS, etc.

Fig. 5 shows a CG-SDT approach comprising the steps of:

s501: the terminal equipment uses CG resource to send up small package data to the access network equipment; optionally, the uplink packet data may include an identifier of the terminal device.

S502: and the access network equipment sends feedback information to the terminal equipment, wherein the feedback information is used for informing the terminal equipment whether the access network equipment successfully receives the uplink packet data.

As can be seen from the above description, when the terminal device is in the RRC inactive state, the packet data may be sent by the RA-SDT or CG-SDT mode, but before the terminal device uses CG resources to perform CG-SDT, it needs to determine whether the CG resources are valid, for example, when the terminal device determines that TA is valid and the terminal device determines that the measured reference signal received power (reference signal received power, RSRP) of the SSB is within a preset threshold range, the CG resources are valid. When the terminal equipment determines that all conditions for CG resource validity cannot be met, the terminal equipment cannot perform CG-SDT and needs RA-SDT, or performs data transmission after recovering to RRC connection state through a random access procedure.

In addition, when the terminal equipment is in RA-SDT, if the terminal equipment needs to be switched to CG-SDT, the terminal equipment needs to enter an RRC connection state through a random access process to acquire CG resources reconfigured by the access network equipment, and after the terminal equipment is switched to an RRC inactive state, the terminal equipment can continue to perform CG-SDT, so that the time consumption is long and the cost is high. It can be seen that the current packet data transmission mode is not flexible enough.

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

The following describes data transmission modes of the terminal device provided in the embodiment of the present application in the case of CG-SDT or RA-SDT packet data transmission, respectively:

1. and the terminal equipment performs a data transmission method when the CG-SDT is performed.

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

s601: and the terminal equipment sends the first data to the access network equipment through the pre-configured authorized resource in the RRC inactive state process. The access network equipment receives the first data sent by the terminal equipment in the RRC inactive state process through the pre-configured authorized resource.

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

S602: the access network equipment sends transmission indication information to the terminal equipment, wherein the transmission indication information is used for indicating the terminal equipment to switch a data transmission mode or continue data transmission.

Optionally, the access network device sends downlink control information (downlink control information, DCI) to the terminal device, where the DCI includes transmission indication information. The DCI may be DCI scrambled by using a radio network temporary identifier (radio network temporary Indicator, RNTI) configured by the access network device to the terminal device and dedicated to the CG-SDT in an inactive state, and the RNTI configured by the access network device to the terminal device and dedicated to the CG-SDT may be an SDT-RNTI or a CG-RNTI.

The transmission indication information is used for indicating the terminal equipment 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 of the first data, a time advance adjustment indication, PUSCH scheduling information, PDSCH scheduling information, and a modulation and coding adjustment indication. The power control instruction is used for indicating the sending power of the second data sent by the terminal equipment, the transmission mode switching instruction is used for indicating the terminal equipment to switch the data transmission mode, the correct response of the first data is used for indicating the access network equipment to successfully receive the first data, the time advance adjustment instruction is also called as TA adjustment instruction, the TA adjustment instruction is used for indicating the terminal equipment to adjust TA, the PUSCH scheduling information is used for indicating the scheduled PUSCH, the terminal equipment can send uplink data to the access network equipment through the scheduled PUSCH, the PDSCH scheduling information is used for indicating the scheduled PDSCH, and the terminal equipment can receive downlink data sent by the access network equipment on the scheduled PDSCH. The modulation and coding adjustment indication is also referred to as MCS adjustment indication, which is used to instruct the terminal device to adjust the MCS.

In an alternative embodiment, the transmission mode switching instruction, the correct response of the first data, and the PUSCH scheduling information in the transmission instruction information are implemented using format0_0 of the DCI. Specifically, when the value of the frequency resource allocation (frequency domain resource allocation, FDRA) field in the DCI of format0_0 is "all 1", it indicates that the transmission instruction information includes a transmission mode switching instruction and/or a correct response of the first data, and when the value of the FDRA field in the DCI of format0_0 is not "all 1", it indicates that the transmission instruction information includes PUSCH scheduling information. Further, DCI of Format1_0 of DCI is used to indicate PDSCH scheduling information in the transmission instruction information.

Optionally, when the value of the FDRA field in DCI of format0_0 is different, the value may be used to indicate different transmission indication information. For example, when the FDRA field in format0_0 takes a value of "all 1", as shown in table 1, 1bit in the transmission instruction information may be occupied to distinguish the transmission mode switching instruction or the correct response of the first data:

TABLE 1

Bit value	Indicating content
0	Transmission mode switching indication
1	Correct response of first data

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

TABLE 2

Alternatively, DCI of format0_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 DCI of format0_0 is used to send the indication content and the number of occupied bits included in the transmission indication information are shown in table 3:

TABLE 3 Table 3

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

1. a power control indication.

The power control instruction is used for indicating the sending power of the second data sent by the terminal equipment, and optionally, the terminal equipment can continue the current CG-SDT for the terminal equipment and send the second data on the next CG resource, for example, the terminal equipment sends the second data through PUSCH; or after the terminal equipment sends the second data, the terminal equipment can switch to RACH or RA-SDT, and send the second data on the random access resource, for example, the terminal equipment sends the second data through PRACH or PUSCH, and the power control indication can be PUSCH power control indication and/or PRACH power control indication.

Alternatively, the power control indication may be carried in a first field of the transmission indication information, where different values of the first field are used to indicate different transmission powers.

In an alternative embodiment, the power control indication is used to indicate the transmission power of the terminal device when transmitting the second data, for example, the first field occupies N bits of the transmission indication information, and the different first field values indicate different transmission power values.

In another alternative embodiment, the power control indication is used to indicate a power offset of the transmission power when the terminal device transmits the second data relative to the transmission power when the terminal device transmits the first data, and after receiving the transmission indication information, the terminal device may determine the transmission power used for transmitting the second data according to the power control indication in the transmission indication information and the transmission power for transmitting the first data.

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

TABLE 4 Table 4

First field (2 bits)	Power offset (dB)
00	-1
01	0
10	1
11	3

2. And transmitting a mode switching instruction.

The transmission mode switching instruction is used for instructing the terminal equipment to switch from the current CG-SDT to the target data transmission mode and continuing to transmit data through the target data transmission mode.

In an alternative embodiment, the transmission mode switching indication includes an identifier of a target data transmission mode and/or a power threshold, where the identifier of the target data transmission mode is used to indicate a type of the target data transmission mode, the target data transmission mode is carried in a second field of the transmission indication information, and a different value of the second field is used to indicate a different data transmission mode; the power threshold is an RSRP threshold, and the power threshold is carried in a third field of the transmission indication information. After receiving the identification and/or the power threshold of the target data transmission mode in the transmission indication information, the terminal device can determine the target data transmission mode to be switched to according to the identification and/or the power threshold of the target data transmission mode.

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

TABLE 5

Second field (2 bits)	Identification of target data transmission mode
00	2-step RACH
01	4-step RACH
10	2-step RA-SDT
11	4-step RA-SDT

In table 5, the 2-step RACH is an identifier corresponding to a two-step random access procedure, and is used to instruct the terminal device to recover from an RRC inactive state to an RRC connected state through the two-step random access procedure; the 4-step RACH is a mark corresponding to a four-step random access process and is used for indicating the terminal equipment to recover from an RRC inactive state to an RRC connection state through the four-step random access process; the 2-step RA-SDT is a mark corresponding to the two-step random access data transmission and is used for indicating the terminal equipment to transmit the packet data through the two-step random access process; the 4-step RA-SDT is a mark corresponding to the four-step random access data transmission and is used for indicating the terminal equipment to transmit the small packet data through the four-step random access process.

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

TABLE 6

Second field (1 bits)	Identification of target data transmission mode
0	RACH
1	RA-SDT

In table 6, RACH is an identifier corresponding to a random access procedure, and is used to instruct a terminal device to recover from an RRC inactive state to an RRC connected state through the random access procedure; the RA-SDT is an identifier corresponding to the random access data transmission and is used for indicating the terminal equipment to transmit the packet data through the random access process.

In an optional embodiment, the power threshold in the handover indication is carried in a third field in the transmission indication information, where the third field occupies X bits in the transmission indication information, and X is a positive integer greater than 0. When the terminal device judges whether to adopt a two-step random access process or a four-step random access process according to the power threshold value, the following operations can be executed specifically: the terminal equipment determines RSRP and compares the RSRP with a power threshold value: if the RSRP is larger than the power threshold, the terminal equipment determines to adopt a two-step random access process, otherwise, the terminal equipment determines to adopt a four-step random access process.

It can be understood that the identifier of the target data transmission mode in the transmission mode switching indication may be used to indicate whether the terminal device performs packet data transmission through a random access procedure, and whether the terminal device performs packet data transmission through a random access procedure of two steps or a random access procedure of four steps may be selected by the terminal device itself, or may be determined by the terminal device by comparing RSRP with a power threshold in the switching indication. Specifically, when the transmission mode switching instruction includes the identifier of the target data transmission mode, the terminal device continues to perform data transmission according to the identifier of the target data transmission mode. When the identification of the target data transmission mode does not indicate that the terminal equipment adopts a two-step random access process or a four-step random access process, if the switching indication comprises a power threshold value, the terminal equipment determines that the terminal equipment adopts the two-step random access process or the four-step random access process according to the power threshold value, and if the transmission mode switching indication does not comprise the power threshold value, the terminal equipment automatically selects to adopt the two-step random access process or the four-step random access process.

Optionally, the transmission indication information may further include a contention-free random access resource indication, where a contention-free random access memory (CFRA) resource is a resource used by the terminal device in performing the non-contention-based random access procedure.

In an alternative embodiment, 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), a Physical Random Access Channel (PRACH) resource Index value, or a range of RO resource Index values. The Preamble Index may be carried in a fourth field of the transmission indication information, and is used for indicating a Preamble used by the terminal device in the random access process; the SSB Index may be carried in a fifth field of the transmission indication information for indicating the SSB associated with the RO; the RO resource Index value or RO resource Index value range may be indicated by PRACH MASK Index, PRACH MASK Index may be carried in a sixth field of the transmission indication information, and a different sixth field value may be used to indicate a different RO resource Index value or RO resource Index value range.

Optionally, the contention-free random access resource indication may further include a Physical Uplink Shared Channel (PUSCH) indication, specifically, the PO indication may be a PO Index value (PO Index), where the PO Index is used to indicate a PUSCH used by the terminal device in the two-step random access procedure, the PO Index may be carried in a seventh field of the transmission indication information, and in implementation, the number of bits occupied by the seventh field may be determined according to the number of candidate POs, for example, when there are 4 candidate POs, the seventh field may occupy 2bits, and different seventh field values are used to indicate different candidate POs.

As an example, a contention-free random access resource indication and a PO indication occupy the number of bits of transmission indication information is shown in table 7.

TABLE 7

3. The correct answer of the first data.

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

In addition, the access network device may also send a correct answer response of the first data to the terminal device by: the access network equipment sends RRC signaling to the terminal equipment, wherein the RRC signaling comprises a correct response of the first data; or the access network device sends a media access control (media access control, MAC) Control Element (CE) to the terminal device, where the MAC CE includes a correct response of the first data.

4. TA adjustment indication.

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

In an optional implementation manner, after the access network device measures the TA, the measured target TA is sent to the terminal device through the TA adjustment instruction, and the terminal device can adjust the TA used by the current terminal device to be the target TA, so as to complete the TA adjustment.

In another alternative embodiment, after the access network device measures the TA, the TA adjustment is performed to send the TA offset between the measured target TA and the TA last indicated to the terminal device by the access network device to the terminal device, and after receiving the transmission indication information including the TA adjustment indication, the terminal device determines the target TA value according to the TA offset in the transmission indication information and the TA value currently used by the terminal device, and adjusts the TA used by the terminal device to be the target TA. It should be noted that, the TA indicated to the terminal device last time by the access network device is the same as the TA currently used by the terminal device.

Optionally, when the transmission indication information includes a transmission mode switching indication, the terminal device switches from the current CG-SDT to the random access procedure, and because the terminal device may acquire TA from the access network device through the random access procedure and perform TA adjustment, the terminal device does not need to instruct the terminal device to perform TA adjustment by the access network device when switching to the random access procedure. Therefore, the eighth field occupied by the TA adjustment indication may be the same as the second field or the third field occupied by the transmission mode switching indication, and in implementation, the transmission mode switching indication or the TA adjustment indication under different scenarios may be implemented by multiplexing the same field, for example, when the transmission mode switching indication is included in the transmission indication information, the second field occupied by the transmission indication information carries the identifier of the target data transmission mode; and when the transmission mode indication is not included in the transmission indication information, the second field occupying the transmission indication information carries the TA adjustment indication.

5. PUSCH scheduling information.

The PUSCH scheduling information is used to instruct the access network device to schedule a PUSCH for the terminal device to send uplink data, and the terminal device may send second data to the access network device on the PUSCH.

Optionally, the PUSCH scheduling information may be retransmission PUSCH scheduling information or new PUSCH scheduling information, where the retransmission PUSCH scheduling information is used to instruct the terminal device to retransmit the first data on the scheduled PUSCH, and the new PUSCH scheduling instruction information is used to instruct the terminal device to transmit the second data on the scheduled PUSCH.

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

TABLE 8

Wherein,representing the number of Resource Blocks (RBs) in the currently active (or available) downstream bandwidth Part (BWP).

The HARQ process number and the new data indication in the PUSCH scheduling information may be used to indicate whether the PUSCH scheduling information is retransmission PUSCH scheduling information or new PUSCH scheduling information, optionally, whether the PUSCH scheduling information is retransmission PUSCH scheduling information or new PUSCH scheduling information is determined according to the following manner:

1. and when the HARQ process number is an unused HRAQ process number or when the HARQ process number is an used HARQ process number and the new data is indicated as 'rollover', determining the PUSCH scheduling information as the new PUSCH scheduling information.

2. When the HARQ process number is the used HARQ process number and the new data is indicated as 'not flipped', determining the PUSCH scheduling information to retransmit the PUSCH scheduling information.

Note that, the HARQ process number that is not used indicates that data has not been transmitted on a process corresponding to the HARQ process number, and the HARQ process number that is used indicates that data has been transmitted on a process corresponding to the HARQ process number, for example, the HARQ process number corresponding to a process where the terminal device sends the first data is the HARQ process number that is used.

6. PDSCH scheduling information.

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

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

After receiving the third data sent by the access network device through the scheduled PDSCH, the terminal device may be configured to notify the access network device whether the terminal device receives the third data by sending feedback information corresponding to the PDSCH to the access network device. 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 send the sending power of the feedback information corresponding to the PDSCH. The feedback power control indication is carried in an eighth field of the transmission indication information, and when the values of the eighth field are different, the feedback power control indication is used for indicating different sending powers.

In a possible implementation manner, the eighth field occupies 2bits of the transmission indication information, and the different values of the eighth field are used to indicate a power offset of the transmission power when the terminal device sends the feedback information relative to the transmission power when the terminal device last sends the uplink data. The specific indication manner may refer to the description of the power control indication in the embodiment of the present application, and the repetition is not repeated.

7. MCS adjustment indication.

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

Optionally, the MCS adjustment indication may be used to indicate an MCS index value, where the MCS index value corresponds to one line of MCS configuration information in an MCS table, and the MCS table may be predefined by a protocol, or may be configured by an access network device to a terminal device through RRC signaling. Each row of MCS configuration information in the MCS table includes at least one of a channel coding rate, a quadrature amplitude modulation (quadrature amplitude modulation, QAM) order, a spectral efficiency.

In an optional implementation manner, the tenth section occupies X bits of the transmission instruction information, and determines an MCS index value according to the value of the tenth section, where the MCS index value corresponds to 2 ^X One row of MCS configuration information in the row MCS table, e.g. the tenth field occupies 5bits of the transmission indication informationThe MCS index value may be determined according to the value of the tenth segment, where the MCS index value corresponds to one row of MCS configuration information in the 32 rows of MCS table.

In another alternative embodiment, the tenth field may occupy X bits of the transmission indication information, for indicating an MCS index value offset of the target MCS index value with respect to the original MCS index value, for example, the original MCS index value=10, and the tenth field occupies 3bits of the transmission indication information, where the first bit in the tenth field is used to indicate a positive offset or a negative offset, such as a negative offset when the bit value is "0", a positive offset when the bit value is "1", the last two bits in the tenth field are used to indicate an offset, and assuming that the value of the tenth field is "010", the MCS index value offset is determined to be-2, the MCS adjustment indication is determined to correspond to the target MCS index value of 8, corresponds to the 8 th row of MCS configuration information in the MCS table (MCS index value starts from 1), or corresponds to the 9 th row of MCS configuration information in the MCS table (MCS index value starts from 0).

It will be appreciated that MCS is used to indicate the modulation scheme and the transport block size, and that the channel coding rate and QAM order affect the transport block size (transmit block size, TBS), and that adjusting MCS may mean adjusting TBS when the preconfigured time-frequency resources are unchanged.

After receiving the transmission instruction information, the terminal device performs S603 and/or S604:

s603: and the terminal equipment sends the second data to the access network equipment according to the transmission indication information, and the access network equipment receives the second data sent by the terminal equipment.

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

In specific implementation, the terminal device determines, according to the transmission instruction information, an operation performed when the terminal device continues to perform data transmission, and when the transmission instruction information includes different instruction contents, different operations performed by the terminal device are described below respectively:

1. the transmission instruction information includes a power control instruction.

When the terminal equipment determines that the transmission indication information comprises the power control indication, the terminal equipment determines target sending power indicated by the power control information according to the value of the first field in the transmission indication information, and the terminal equipment sends second data to the access network equipment according to the target sending power.

Optionally, when the power control instruction is used for indicating a power offset of the transmission power when the terminal device transmits the second data relative to the transmission power when the terminal device transmits the first data, the terminal device determines the power offset according to the power control instruction, determines the target transmission power according to the transmission power and the power offset when the terminal device transmits the first data, and uses the target transmission power to transmit the second data to the access network device on a next CG resource of the CG resource for transmitting the first data.

2. The transmission instruction information includes a handover instruction.

When the terminal equipment determines that the transmission indication information comprises the switching indication, determining a target data transmission mode corresponding to the switching indication information, switching to the target transmission mode, and then sending second data to the access network equipment.

In a possible implementation manner, the handover indication includes an identifier of a target data transmission mode, where the target data transmission mode may be a two-step random access data transmission, a two-step random access procedure, a four-step random access data transmission, or a four-step random access procedure. The following four cases are included:

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

b. When the terminal equipment determines that the identifier of the target transmission mode is the identifier corresponding to the two-step random access process, the terminal equipment sends second data to the access network equipment after recovering from the RRC inactive state to the RRC connection state through the two-step random access process.

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

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

In another embodiment, if the handover indication includes a power threshold, 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 occupied by the power threshold in the transmission indication information is limited, the access network device may configure a plurality of power thresholds to the terminal device through RRC signaling or a system message, and then instruct the terminal device to select one of the plurality of power thresholds through a third field in the transmission indication information. And after receiving the transmission indication information, the terminal equipment determines a power threshold indicated by the switching indication according to the value of the third field and a plurality of power thresholds configured by the access network equipment. The specific implementation includes the following two cases:

a. And when the terminal equipment determines that the reference signal receiving power is larger than the power threshold, the terminal equipment sends second data to the access network equipment through a two-step random access process, or the terminal equipment sends the second data to the access network equipment after recovering from the RRC inactive state to the RRC connection state through the two-step random access process.

b. And when the terminal equipment determines that the reference signal receiving power is smaller than or equal to the power threshold, the terminal equipment sends second data to the access network equipment through a four-step random access process, or the terminal equipment sends the second data to the access network equipment after recovering from an RRC inactive state to an RRC connected state through the four-step random access process.

In yet another embodiment, when the handover indication includes an identification of a target data transmission mode and a power threshold, the target data transmission mode includes a random access procedure and a random access data transmission. And the terminal equipment determines a power threshold according to the value of the third field in the transmission indication information. The specific implementation comprises the following four cases:

a. when the terminal equipment determines that the identification of the target data transmission mode is the identification corresponding to the random access data transmission and the reference signal receiving power is larger than the power threshold, the terminal equipment sends second data to the access network equipment through a two-step random access process.

b. When the terminal equipment determines that the identifier of the target data transmission mode is the identifier corresponding to the random access process and the reference signal receiving power is larger than the power threshold, the terminal equipment sends second data to the access network equipment after recovering from the RRC inactive state to the RRC connection state through the two-step random access process.

c. When the terminal equipment determines that the identifier of the target data transmission mode is the identifier corresponding to the random access data transmission and the reference signal receiving power is smaller than or equal to the power threshold, the terminal equipment sends second data to the access network equipment through a four-step random access process.

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

Optionally, if the transmission indication information includes a contention-free random access resource indication, the terminal device performs a two-step random access procedure or a four-step random access procedure on a resource indicated by the contention-free random access resource, for example, determines a corresponding random access Preamble1 according to a random access Preamble index value included in the contention-free random access resource indication, determines SSB1 used in the random access procedure according to a synchronization signal block index value, and determines RO resource 1 corresponding to the random access procedure according to an RO resource index value. 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, assuming that the terminal device determines that the target data transmission manner corresponding to the handover indication is two-step random access data transmission, the terminal device may perform packet data transmission based on the two-step random access procedure shown in fig. 3.

For another example, assuming that the terminal device determines that the target data transmission manner corresponding to the handover indication is four-step random access data transmission, the terminal device may perform packet data transmission based on the four-step random access procedure shown in fig. 4.

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

The terminal equipment determines a correct response of the transmission indication information including the first data, and sends the second data to the access network equipment through the process of sending the first data.

Optionally, if the terminal device determines that the transmission indication information does not include the correct response of the first data, the terminal device sends the second data to the access network device through a process of sending the first data; wherein the second data is identical to the first data, or the information bits of the second data and the first data are identical, or the effective information of the second data and the first data are identical, or the second data information is a redundancy version of the first data information. That is, when the terminal device determines that the correct response to the first data is not included in the transmission instruction information, the first data may be retransmitted using a process of transmitting the first data.

4. The transmission instruction information includes PDSCH scheduling information.

When the terminal equipment determines that the transmission indication information comprises the PDSCH scheduling information, the terminal equipment 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 higher layer feedback information (such as feedback information sent by RRC signaling or MAC CE) sent by the access network device.

Optionally, if the transmission indication information further includes a feedback power control indication, the terminal device determines, according to a value of an eighth field occupied by the feedback power control indication, a transmission power indicated by the feedback power control indication, and sends, according to the transmission power indicated by the feedback power control indication, feedback information corresponding to the third data to the access network device, so as to inform the access network device whether the device successfully receives the third data when the terminal of the access network device.

In addition, when the transmission instruction information does not include the correct response of the first data and the power control instruction, if the terminal device receives the configuration information sent by the access network device through RRC signaling and used for instructing the terminal device to use the feedback power control instruction as the power control instruction, the terminal device may determine the sending 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 sending power indicated by the feedback power control.

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

When the terminal equipment determines that the transmission indication information comprises the scheduling retransmission indication, determining scheduling retransmission resources indicated by the scheduling retransmission indication, and sending second data on the scheduling retransmission resources, wherein the second data is identical to the first data, or the information bits of the second data and the first data are identical, or the effective information of the second data and the first data is identical, or the second data information is a redundancy version of the first data information.

By the method, after the terminal equipment sends the first data to the access network equipment through the CG resource in the RRC inactive state process, the transmission indication information sent by the access network equipment can be received, the terminal equipment can switch the data transmission mode or continue the current data transmission according to the transmission indication information, the data transmission is flexible, the resource waste caused by the fact that the terminal equipment blindly tries to switch the data transmission mode is avoided, and the data transmission efficiency is improved.

The data transmission method when CG-SDT is performed by the terminal device provided in the present application is further described below in several specific examples:

example 1

Fig. 7 shows a data transmission method provided in example 1, specifically including the following steps:

S701: and the terminal equipment sends the first data to the access network equipment through the pre-configured authorized resource in the RRC inactive state process.

S702: the access network equipment sends transmission indication information to the terminal equipment, wherein the transmission indication information comprises a correct response of the first data and a power control indication.

S703: and the terminal equipment determines the power offset according to the value of the first field occupied by the power control instruction in the transmission instruction information.

S704: the terminal equipment determines target transmission power according to the power offset and the transmission power when the terminal equipment transmits the first data;

s705: and the terminal equipment uses the target transmission power to transmit the second data to the access network equipment through the process of transmitting the first data.

In this example, the access network device may send the correct response of the first data and the power control indication to the terminal device through the transmission indication information, and the terminal device may send the second data to the access network device according to the power control indication, so as to implement closed loop power control of data transmission between the terminal device and the access network device, so that the terminal device may adjust the transmission power in time according to the power control indication, thereby avoiding energy consumption waste due to excessive high transmission power and increase interference, and avoiding poor receiving performance due to excessive low transmission power.

Example 2

Fig. 8 shows a data transmission method provided in example 2, specifically including the following steps:

s801: and the terminal equipment sends the first data to the access network equipment through the pre-configured authorized resource in the RRC inactive state process.

S802: the access network device sends transmission indication information to the terminal device, wherein the transmission indication information comprises transmission mode switching indication and contention-free random access resource indication.

S803: and the terminal equipment determines the target data transmission mode to be four-step random access data transmission according to the identification of the target data transmission mode in the transmission mode switching instruction.

S804: and the terminal equipment 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 operation performed by the terminal device when the contention-free random access resource in the transmission indication information is indicated, and the repetition is not repeated.

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

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

S807: and the terminal equipment sends second data to the access network equipment on the RAR scheduled resource.

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

The specific implementation of S805 to S808 may refer to the packet data transmission method based on the four-step random access procedure shown in fig. 4, and the repetition is not repeated.

In this example, the access network device sends the switching instruction and the contention-free random access resource instruction through the transmission instruction information, and the terminal device can switch to the target data transmission mode according to the switching instruction, and perform data transmission through the resources indicated by the contention-free random access resource, so that the terminal device can accurately determine the target data mode and switch, and unnecessary resource overhead caused by blind attempts of the terminal device on other data transmission modes is avoided.

Example 3

Fig. 9 shows a data transmission method provided in example 3, specifically including the following steps:

s901: and the terminal equipment sends the first data to the access network equipment through the pre-configured authorized resource in the RRC inactive state process.

S902: the access network equipment sends transmission indication information to the terminal equipment, wherein the transmission indication information comprises PDSCH scheduling information and feedback power control indication.

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

S904: and the terminal equipment sends feedback information corresponding to the third data to the access network equipment according to the sending 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 the downlink data sent by the access network device in the RRC inactive state, and realize transmission of downlink packet data or non-packet data.

Example 4

Fig. 10 shows a data transmission method provided in example 4, specifically including the following steps:

s1001: and the terminal equipment sends the first data to the access network equipment through the pre-configured authorized resource in the RRC inactive state process.

S1002: the access network equipment sends transmission indication information to the terminal equipment, wherein the transmission indication information comprises PUSCH scheduling information.

S1003: and the terminal equipment determines the PUSCH scheduling information to retransmit the PUSCH scheduling information according to the HARQ process number and the new data indication in the PUSCH scheduling information.

S1004: and the terminal equipment sends second data to the access network equipment on the PUSCH resources scheduled by the PUSCH scheduling information.

Wherein the second data is identical to the first data, or the information bits of the second data and the first data are identical, or the effective information of the second data and the first data are identical, or the second data information is a redundancy version of the first data information.

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

Example 5

Fig. 11 shows a data transmission method provided in example 5, specifically including the following steps:

s1101: and the terminal equipment sends the first data to the access network equipment through the pre-configured authorized resource in the RRC inactive state process.

S1102: the access network equipment sends transmission indication information to the terminal equipment, wherein the transmission indication information comprises PUSCH scheduling information.

S1103: and the terminal equipment determines the PUSCH scheduling information to be the new PUSCH scheduling information according to the HARQ process number and the new data indication in the PUSCH scheduling information.

S1104: and the terminal equipment sends second data to the access network equipment on the PUSCH resources indicated by the PUSCH scheduling information.

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

Example 6

Fig. 12 shows a data transmission method provided in example 6, specifically including the steps of:

s1201: and the terminal equipment sends the first data to the access network equipment through the pre-configured authorized resource in the RRC inactive state process.

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

S1203: and the terminal equipment determines the power offset according to the value of the first field occupied by the power control instruction in the transmission instruction information.

S1204: and the terminal equipment determines the target transmission power according to the power offset and the transmission power when the terminal equipment transmits the first data.

S1205: and the terminal equipment uses the target transmission power to transmit the second data to the access network equipment through the process of transmitting the first data.

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

The execution order of S1203 to S1205 and S1206 is not limited in the embodiment of the present application, and S1203 to S1205 may be executed first and then S1206 may be executed, or S1203 to S1205 may be executed first and then S1206 may be executed.

In this example, the access network device may send the correct response of the first data, the power control indication and the PDSCH scheduling information through the transmission indication information, and the terminal device may continue to send the second data according to the power control information, and may receive the third data on the PDSCH scheduled by the PDSCH scheduling information, so as to flexibly implement data transmission of the terminal device in the RRC inactive state.

Example 7

Fig. 13 shows a data transmission method provided in example 7, specifically including the steps of:

s1301: and the terminal equipment sends the first data to the access network equipment through the pre-configured authorized resource in the RRC inactive state process.

S1302: the access network equipment sends transmission indication information to the terminal equipment, wherein the transmission indication information comprises transmission mode switching indication and power control indication.

S1303: and the terminal equipment determines the target transmission mode to be the identification of the four-step random access data transmission according to the transmission mode switching indication in the transmission indication information.

S1304: the terminal equipment determines target sending power according to the power control instruction in the transmission instruction information.

S1305: and the terminal equipment sends the Preamble to the access network equipment on one RO according to the target sending power.

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

S1307: and the terminal equipment sends second data to the access network equipment on the RAR scheduled resource.

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

In this example, the access network device may send transmission indication information including a transmission mode switching indication and a power control indication to the terminal device, and the terminal device may switch to a target data transmission mode according to the transmission mode switching indication, and perform data transmission in the target data transmission mode according to the target transmission power indicated by the power control indication.

Example 8

Fig. 14 shows a data transmission method provided in example 8, specifically including the steps of:

S1401: and the terminal equipment sends the first data to the access network equipment through the pre-configured authorized resource in the RRC inactive state process.

S1402: the access network equipment sends transmission indication information to the terminal equipment, wherein the transmission indication information comprises a correct response of the first data and TA adjustment indication.

S1403: and the terminal equipment determines a target TA according to the TA adjustment instruction and adjusts the TA of the terminal equipment to the target TA.

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

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

Example 9

Fig. 15 shows a data transmission method provided in example 9, specifically including the steps of:

s1501: and the terminal equipment sends the first data to the access network equipment through the pre-configured authorized resource in the RRC inactive state process.

S1502: the access network equipment sends transmission indication information to the terminal equipment, wherein the transmission indication information comprises correct response of the first data and MCS adjustment indication.

S1503: and the terminal equipment determines an MCS index value according to the tenth field value occupied by the MCS adjustment instruction in the transmission instruction information.

S1504: and the terminal equipment determines one row of MCS configuration information in the MCS table corresponding to the MCS index value according to the pre-configured MCS table and the MCS index value.

S1505: and the terminal equipment adjusts the MCS according to the MCS configuration information.

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

2. And the terminal equipment performs a data transmission method during RA-SDT.

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

s1601: in the RRC inactive state process, the terminal equipment sends a random access request to the access network equipment, and the access network equipment receives the random access request from the terminal equipment in the RRC inactive state process.

In a specific implementation, the terminal device sends the Preamble to the access network device on one RO, where the Preamble and the RO may be dedicated resources indicated by the access network device to the terminal device, for example, dedicated resources indicated by the access network device to the terminal device through contention-free random access resource indication. Or the access network equipment indicates public resources, and the terminal equipment selects the Preamble and the RO used in the random access process of the terminal equipment from the public resources indicated by the access network equipment.

The Preamble and the RO may also be used to distinguish data transmission types, for example, the terminal device triggers a random access request through different preambles and ROs to notify the access network device of the data transmission type. Alternatively, 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 equipment sends transmission indication information to the terminal equipment, the transmission indication information is used for indicating the mode and/or the resource of the terminal equipment for data transmission, and the terminal equipment receives the transmission indication information from the access network equipment.

In an alternative embodiment, the transmission indication information may include at least one of a transmission mode switching indication, a resource indication, and a beam indication. The transmission mode switching instruction is used for indicating the terminal equipment to switch to the unlicensed scheduling data transmission after the random access process or the random access data transmission is finished; the resource indication is used for indicating the pre-configured authorized resource when the terminal equipment performs the unlicensed scheduling data transmission; the beam indication is used for indicating the corresponding relation between the synchronous signal block and the pre-configured authorized resource.

The following describes each item of indication content that may be included in the transmission indication information:

1. and transmitting a mode switching instruction.

The transmission mode switching indication is used for indicating the terminal equipment to use the pre-configured authorized resource to carry out CG-SDT after the current random access process or the random access data transmission is finished.

Alternatively, the transmission mode switching indication may be carried in a first field of the transmission indication information, for example, the first field occupies 1bit of the transmission indication information, when the bit value of the bit is 1, it indicates that the terminal device is instructed to perform CG-SDT using the pre-configured grant resource after the currently performed RACH or RA-SDT is completed, and when the bit value of the bit is 0, it indicates that the terminal device is instructed not to perform CG-SDT after the currently performed RACH or RA-SDT is completed.

2. A resource indication.

The resource indication is used for indicating CG resources when the terminal equipment performs unlicensed scheduling data transmission, and optionally, the resource indication can be carried in a second field of the transmission indication information, wherein the values of the second field are different, and the resource indication is used for indicating activation of different preconfigured authorized resources.

The CG resource is a resource preconfigured by the access network device for the terminal device and used for CG-SDT, and may specifically include PUSCH resource used for uplink data transmission and a corresponding transmission parameter. When the access network equipment is configured with CG resources for the terminal equipment, one or more CG resources can be configured in advance, and the access network equipment can activate one or more CG resources for the terminal equipment to use when the terminal equipment performs CG-SDT by sending a resource indication to the terminal equipment.

In an alternative embodiment, the second field may be a bitmap, where the bitmap includes one or more bits, each bit corresponds to one CG resource, and the bit value of the bit corresponding to each CG resource is 0 or 1 to indicate whether the CG resource is activated, and the bitmap including N bits is used to indicate that one or more CG resources of the N CG resources are activated. For example, a bit value of 1 indicates that the CG resource corresponding to the bit is activated, a bit value of 0 indicates that the CG resource corresponding to the bit is not activated, 5 CG resources are pre-configured for the terminal device, and the bit maps corresponding to 5 CG resources in the resource indication are 00101 respectively, which indicates that CG3 and CG5 are activated, and the terminal device can be used for CG-SDT, and other CG resources are not activated.

3. Beam pointing.

The beam indication is used for indicating the corresponding relation between the SSB and the CG resource.

It is known that during random access, a plurality of SSBs may be included in one SSB period, each SSB has a corresponding number, and beams corresponding to the SSBs may be the same or different. For the terminal device, when the beam scanning signal corresponding to the SSB is covered on the terminal device, the terminal device has an 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, so that the access network device can determine SSB information (such as an index value of the optimal SSB) according to the RO used by the terminal device. The access network device can take the corresponding relation between the SSB index value and the CG resource as the beam indication, and after the terminal device receives the beam indication in the transmission indication information, the terminal device can access part or all of CG resources by using the time corresponding to the optimal SSB index value through the beam indication when CG-SDT is carried out, so that the signal quality when the terminal device carries out CG-SDT is improved.

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

Or, the access network device may also notify the corresponding relationship between the SSB index value and the CG resource to the terminal device through the high-layer signaling, for example, the access network device sends the corresponding relationship between the SSB index value and the CG resource shown in fig. 18 to the terminal device through the high-layer signaling.

In an alternative embodiment, the transmission indication information may further include a contention-free random access resource indication, where contention-free random access memory (CFRA) resources are resources used by the terminal device in performing the non-contention based random access procedure.

Alternatively, 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 an RO resource Index value range. The Preamble Index can bear a second field of the transmission indication information, and is used for indicating a Preamble used by the terminal equipment in the random access process; the SSB Index may be carried in a third field of the transmission indication information for indicating the SSB associated with the Preamble; the RO resource Index value or RO resource Index value range may be indicated by PRACH MASK Index, PRACH MASK Index may be carried in a fourth field of the transmission indication information, and a different fourth field value may be used to indicate a different RO resource Index value or RO resource Index value range.

Optionally, the contention-free random access resource indication may further include a PO indication, specifically, the PO indication may be a PO Index, where the PO Index is used to indicate a PUSCH used by the terminal device in the two-step random access procedure, the PO Index may be carried in a fifth field for transmitting indication information, and in implementation, the number of bits occupied by the fifth field may be determined according to the number of candidate POs, for example, when 4 candidate POs exist, the fifth field may occupy 2bits, and different values of the fifth field are used to indicate different candidate POs.

The specific indication mode when the transmission indication information includes the contention-free random access resource indication can be referred to the description 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, and the repetition is not repeated.

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

first, after receiving a Preamble sent by a terminal device, an access network device sends DCI to the terminal device, and sends downlink information on a PDSCH scheduled by the DCI, for example, sends downlink information such as a random access response RAR and collision resolution information to the terminal device through the PDSCH.

Based on the above description, the access network device may send transmission instruction information to the terminal device in the following manner:

in mode 1, an access network device transmits DCI to a terminal device, where the DCI includes transmission instruction information.

In an alternative embodiment, the transmission indication information may be carried on a reserved field of DCI scrambled by a radio network temporary identifier (radio network temporary indicator, RNTI), which may be an unoccupied field in DCI specified by an existing protocol.

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

TABLE 9

Where Reserved bits represent Reserved fields in DCI, for example, 16bits Reserved fields shown in table 9, transmission indication information may be carried on the 16bits Reserved fields.

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

Mode 2, an access network device transmits DCI to a terminal device, and transmits transmission instruction information on a PDSCH scheduled by the DCI.

It should be noted that, in modes 1 and 2, the access network device may send DCI to the terminal device in the random access process, where the DCI includes transmission instruction information or sends transmission instruction information on the PDSCH scheduled by the DCI, for example, in Msg2 or Msg4 in the four-step random access process, or Msg b in the two-step random access process, the access network device sends DCI to the terminal device, and the DCI includes transmission instruction information or sends transmission instruction information on the PDSCH scheduled by the DCI. In addition, after the random access procedure is finished, in modes 1 and 2, when the terminal device has not been switched from the RRC inactive state to the RRC connected state, the access network device may send DCI to the terminal device, where the DCI includes transmission instruction information or sends the transmission instruction information on the PDSCH scheduled by the DCI.

In the mode 3, the access network device sends an RAR to the terminal device, wherein 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 the access network device receives the Preamble sent by the terminal device, the access network device sends an RAR to the terminal device, where the RAR may include transmission indication information.

In the mode 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 a PDSCH scheduled by DCI.

In an alternative embodiment, in the random access data transmission, the conflict resolution information may include an identifier of a successfully accessed terminal device, feedback information corresponding to uplink packet data sent by the terminal device (for indicating whether the access network device receives the uplink packet data), and transmission indication information.

Mode 5, the access network device sends an RRC signaling to the terminal device, where the RRC signaling includes transmission indication information, and the RRC signaling is carried on a PDSCH scheduled by DCI.

When the access network device sends the transmission instruction information to the terminal device in the modes 2 to 5, the transmission instruction information can be borne on an undefined logic channel 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 defined logical channels, the transmission indication information may be carried on the logical channels with logical channel numbers 35-46 in the MAC CE.

S1603: and the terminal equipment performs data transmission according to the transmission indication information.

In an optional implementation manner, according to different indication contents included in the transmission indication information, the data transmission manner of the terminal device according to the transmission indication information is different, and the data transmission manner of the terminal device when the transmission indication information includes different indication contents is described below:

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

When the transmission indication information comprises a transmission mode switching indication, the terminal equipment uses the pre-configured authorized resource to carry out CG-SDT after the current random access process or random access packet transmission is finished.

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

When the transmission indication information comprises a transmission mode switching indication and a resource indication, the terminal equipment determines a target pre-configured authorized resource corresponding to the resource indication according to the value of the second field, and the terminal equipment uses the target pre-configured authorized resource corresponding to the resource indication to perform CG-SDT after the current random access process or random access packet transmission is finished.

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

When the transmission indication information comprises transmission mode switching indication, resource indication and beam indication, the terminal equipment determines a target pre-configuration authorized resource corresponding to the resource indication according to the value of the second field, then the terminal equipment determines an SSB index value corresponding to the target pre-configuration authorized resource according to the beam indication, and after the current RACH or RA-SDT is finished, the terminal equipment uses the target pre-configuration authorized resource to send uplink packet data to the access network equipment at the time corresponding to the SSB index value.

Optionally, after receiving the transmission instruction information sent by the access network device, the terminal device may further send feedback information corresponding to the transmission instruction information to the access network device, where the feedback information corresponding to the transmission instruction information is used to feedback whether the terminal device accepts the transmission instruction of the transmission instruction information. For example, the terminal device may send feedback information corresponding to the transmission instruction information to the access network device through a physical uplink control channel (physical uplink control channel, PUCCH).

By the method, the access network equipment can send the transmission indication information to the terminal equipment after receiving the random access request sent by the terminal equipment in the RRC inactive state process of the terminal equipment, so that the terminal equipment is indicated to perform data transmission mode and/or resource in the random access process of the terminal equipment, the terminal equipment is not required to acquire the reconfigured resource and switch the data transmission mode after recovering from the RRC inactive state to the RRC connection state, the resource cost is saved, and the flexibility of data transmission is improved.

The following describes the data transmission methods when the terminal device provided in the embodiment of the present application performs 4-step RA-SDT and 2-step RA-SDT, respectively:

1. And the terminal equipment performs a data transmission method when the 4-step RA-SDT is performed.

Fig. 19 shows a data transmission method when a terminal device performs 4-step RA-SDT, which is provided in an embodiment of the present application, and includes the following steps:

msg1: the terminal device sends a Preamble to the access network device on one RO.

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

The DCI or RAR scrambled by the RA-RNTI includes transmission indication information, and the specific indication manner refers to the description of step S1302 in fig. 13, and the repetition is not repeated.

Msg3: and the terminal equipment sends the uplink packet data and/or the identification of the terminal equipment to the access network equipment on the PUSCH scheduled by the RAR.

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

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

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

In addition, after receiving the transmission instruction information, the terminal device may further execute the following steps:

and the terminal equipment sends ACK/NACK of the Msg4 and feedback information corresponding to the transmission instruction information to the access network equipment.

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

2. And the terminal equipment performs a data transmission method when the 2-step RA-SDT is performed.

Fig. 20 shows a data transmission method when a terminal device performs 2-step RA-SDT, which is provided in the embodiment of the present application, and includes 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 packet data and/or the identity of the terminal device on one PO.

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

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

In a specific implementation, the terminal device may send ACK/NACK of the MsgB and 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, where one bit is used to indicate ACK/NACK of the Msg4, and another bit is used to indicate feedback information corresponding to the transmission indication information.

3. And after the random access process is finished, the terminal equipment is not switched from the RRC inactive state to the RRC connection state.

Fig. 21 shows a data transmission method when a terminal device has not been switched from an RRC inactive state to an RRC connected state after the random access procedure provided in the embodiment of the present application is ended, taking the random access procedure as an example of a two-step random access procedure, 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 packet data and/or the identity of the terminal device on one PO.

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

S2103: before the terminal equipment is switched from the RRC inactive state to the RRC connection state, the access network equipment sends DCI to the terminal equipment, and sends transmission indication information on a PDSCH scheduled by the DCI, wherein the transmission indication information comprises resource indication and transmission mode switching indication.

Optionally, the DCI may also include transmission indication information.

S2104: and the terminal equipment uses the pre-configured authorized resources corresponding to the resource indication to send the uplink packet data to the access network equipment.

Based on the same technical idea, the present application also provides a communication apparatus 2200 having a structure as shown in fig. 22, including a communication unit 2201 and a processing unit 2202. The communication apparatus 2200 may be applied to a terminal device or an access network device in the communication apparatus shown in fig. 1, and may implement the data transmission methods shown in fig. 6 to 15 or fig. 16, and fig. 19 to 21. The functions of the individual units in the device 2200 are described below.

The communication unit 2201 is configured to receive and transmit data.

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

The mobile communication module may provide a solution for wireless communication including 2G/3G/4G/5G etc. 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 (low noise amplifier, LNA), etc. The terminal equipment can be accessed into a mobile communication network through the mobile communication module, and then access into the certificate management framework through the mobile communication network.

The wireless communication module may provide solutions for wireless communication including wireless local area network (wireless local area networks, WLAN) (e.g., wireless fidelity (wireless fidelity, wi-Fi) network), bluetooth (BT), global navigation satellite system (global navigation satellite system, GNSS), frequency modulation (frequency modulation, FM), short range wireless communication technology (near field communication, NFC), etc. applied on the terminal device. The wireless communication module 160 may include at least one antenna, one or more devices of at least one communication processing module. The terminal equipment can be accessed into a wireless communication network through the wireless communication module, and then access into the certificate management framework 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, an input-output interface. The access network device can be connected with a network cable or a cable through the communication unit, so as to establish physical connection with other devices.

The function of the processing unit 2202 will be described below when the communication apparatus 2200 is applied to a terminal device.

In an implementation manner of the present application, the communication apparatus 2200 is applied to a terminal device in the first data transmission method provided in the embodiment of the present application, where the communication apparatus 2200 may implement a function of the terminal device in the data transmission method shown in fig. 6 to 15 of the present application, and a function of the processing unit 2202 is described as follows:

a processing unit 2202, configured to send, through the communication unit 2201, first data to an access network device through a preconfigured grant resource during a process that the terminal device is in an RRC inactive state; receiving, by the communication unit 2201, transmission instruction information from the access network device, where the transmission instruction information is used to instruct the terminal device to switch a data transmission mode or continue data transmission; and according to the transmission indication information, sending second data to the access network equipment through the communication unit 2201 or receiving third data sent by the access network equipment.

In one embodiment, the transmission indication information includes at least one of: a power control instruction, a transmission mode switching instruction, a correct response of the first data, physical Uplink Shared Channel (PUSCH) scheduling information, physical Downlink Shared Channel (PDSCH) scheduling information, a time advance adjustment instruction and a modulation and coding strategy adjustment instruction;

wherein the power control instruction is used for indicating the sending power of the second data sent by the terminal equipment; the transmission mode switching instruction is used for instructing the terminal equipment to switch the data transmission mode; the correct response of the first data is used for indicating the access network equipment to receive the first data; the PUSCH scheduling information is used for indicating the terminal equipment to send second data on the scheduled PUSCH; the PDSCH scheduling information is used for indicating the terminal equipment to receive third data on the scheduled PDSCH; the time advance adjustment instruction is used for indicating the terminal equipment to adjust the time advance; the modulation and coding strategy adjustment instruction is used for instructing the terminal equipment to adjust the modulation and coding strategy.

In one embodiment, 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; when the values of the first fields are different, the power control instruction is used for indicating different sending powers;

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

In one embodiment, when the transmission mode switching instruction is included in the transmission instruction information, the transmission mode switching instruction includes: identification of a target data transmission mode and/or a power threshold; the identification of the target transmission mode is carried in a second field of the transmission indication information, and when the values of the second field are different, the identification of the target transmission mode is used for indicating the identifications of different data transmission modes; the power threshold is a receiving power threshold of the reference signal, the power threshold is carried in a third field of the transmission indication information, and when the values of the third field are different, the values of the power threshold are different.

In one embodiment, when the transmission mode switching instruction includes the identification of the target data transmission mode, the processing unit 2202 is specifically configured to: when the identifier of the target transmission mode is determined to be the identifier corresponding to the two-step random access data transmission, the second data is sent to the access network device through the communication unit 2201 by the two-step random access process; or when the identifier of the target transmission mode is determined to be the identifier corresponding to the two-step random access process, after the two-step random access process is recovered from the RRC inactive state to the RRC connected state, sending the second data to the access network device through the communication unit 2201; or when the identifier of the target transmission mode is determined to be the identifier corresponding to the four-step random access data transmission, sending, by the communication unit 2201, the second data to the access network device through a four-step random access process; or when the identifier of the target transmission mode is determined to be the identifier corresponding to the four-step random access procedure, after the four-step random access procedure is recovered from the RRC inactive state to the RRC connected state, the communication unit 2201 sends the second data to the access network device.

In one embodiment, the processing unit 2202 is specifically configured to: when the transmission mode switching indication comprises the power threshold, determining the power threshold according to the value of a third field in the transmission indication information; when the reference signal received power is determined to be greater than the power threshold, sending the second data to the access network device through the communication unit 2201 by a two-step random access process, or after recovering from an RRC inactive state to an RRC connected state by a two-step random access process, sending the second data to the access network device through the communication unit 2201; or when the reference signal received power is determined to be less than or equal to the power threshold, the communication unit 2201 sends the second data to the access network device through a four-step random access procedure, or after the RRC inactive state is restored to the RRC connected state through the four-step random access procedure, the communication unit 2201 sends the second data to the access network device.

In one embodiment, the processing unit 2202 is specifically configured to: when the transmission mode switching indication comprises the identification of the target data transmission mode and the power threshold value, determining the power threshold value according to the value of a third field in the transmission indication information; when the identifier of the target data transmission mode is determined to be the identifier corresponding to the random access data transmission, and the reference signal received power is greater than the power threshold, sending second data to the access network device through the communication unit 2201 in a two-step random access process; or when the identifier of the target data transmission mode is determined to be the identifier corresponding to the random access process and the reference signal received power is greater than the power threshold, after the two-step random access process is recovered from the RRC inactive state to the RRC connected state, sending second data to the access network device through the communication unit 2201; or when the identifier of the target data transmission mode is determined to be the identifier corresponding to the random access data transmission, and the reference signal received power is smaller than or equal to the power threshold, sending second data to the access network device through the communication unit 2201 by a four-step random access process; or when the identifier of the target data transmission mode is determined to be the identifier corresponding to the random access process and the reference signal received power is smaller than or equal to the power threshold, after the RRC inactive state is recovered to the RRC connected state through the four-step random access process, sending second data to the access network device through the communication unit 2201.

In one embodiment, the transmission instruction information further includes: a contention-free random access resource indication; the contention-free random access resource indication is used to indicate resources used by the terminal device in the two-step random access procedure or 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, a physical random access channel opportunity RO resource index value or an RO resource index value range; the random access preamble index value is carried in a fourth field of the transmission indication information; the synchronization signal block index value is carried in a fifth field of the transmission indication information, and the RO resource index value or the RO resource index value range is carried in a sixth field of the transmission indication information.

In one embodiment, the contention-free random access resource indication further comprises: and the PO indication is used for indicating the uplink shared channel used by the terminal equipment in the two-step random access process, and is carried in a seventh field of the transmission indication information.

In one embodiment, the processing unit 2202 is specifically configured to: if the transmission indication information comprises a correct response of the first data; transmitting the second data to the access network device through the communication unit 2201 by a process of transmitting the first data;

if the transmission indication information does not include the correct response of the first data, sending, by a process of sending the first data, the second data to the access network device through the communication unit 2201; wherein the second data is identical to the first data, or the second data and the first data have the same information bit, or the second data and the first data have the same valid information, or the second data is a redundancy version of the first data.

In one embodiment, the processing unit 2202 is specifically configured to: when the transmission indication information comprises the PDSCH scheduling information, determining the PDSCH scheduled by the transmission indication information according to the PDSCH scheduling information; the third data is received by the communication unit 2201 on the PDSCH scheduled by the transmission instruction information.

In one embodiment, the transmission instruction information further includes: and the feedback power control instruction is used for indicating the sending power of feedback information corresponding to the PDSCH sent by the terminal equipment, and is carried in an eighth field of the transmission instruction information, and when the values of the eighth field are different, the feedback power control instruction is used for indicating different sending powers.

In one embodiment, the processing unit 2202 is further configured to: if the transmission instruction information does not include the correct response of the first data and the power control instruction, receiving, by the communication unit 2201, a 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 instruction as a power control instruction; determining the sending power indicated by the feedback power control indication according to the value of the eighth field in the transmission indication information; and transmitting, by the communication unit 2201, the second data to the access network device according to the transmission power indicated by the feedback power control instruction.

In one embodiment, the RRC signaling includes a correct acknowledgement response of the first data; or the processing unit 2202, is further configured to: after receiving the transmission indication information from the access network device through the communication unit 2201, receiving a media access control MAC control element CE sent by the access network device, where the MAC CE includes a correct response of the first data.

In one embodiment, the PUSCH scheduling information is retransmission PUSCH scheduling information or new PUSCH scheduling information;

The processing unit 2202 is specifically configured to: when the PUSCH scheduling information is retransmission PUSCH scheduling information, sending, by the communication unit 2201, the second data to the access network device on a PUSCH scheduled by the retransmission PUSCH scheduling instruction, where the second data is the same as the first data, or information bits of the second data and the first data are the same, or valid information of the second data and the first data is the same, or the second data is a redundancy version of the first data; and when the PUSCH scheduling information is new PUSCH scheduling information, sending, by the communication unit 2201, the second data to the access network device on a PUSCH scheduled by the new PUSCH scheduling information.

In one embodiment, when the transmission indication information includes the time advance adjustment indication, the time advance adjustment indication is carried on a ninth field of the transmission indication information.

In one embodiment, the processing unit 2202 is further configured to: before sending second data to the access network device through the communication unit 2201 according to the transmission indication information or receiving third data sent by the access network device, determining a target time advance according to the time advance adjustment indication, and adjusting the time advance of the terminal device according to the target time advance.

In one embodiment, when the transmission indication information includes the modulation and coding strategy adjustment indication, the modulation and coding strategy adjustment indication is carried on a tenth field of the transmission indication information, and when the tenth field has a different value, the modulation and coding strategy adjustment indication is used for indicating different modulation and coding strategies.

In one embodiment, the processing unit 2202 is further configured to: before sending second data to the access network device through the communication unit 2201 according to the transmission instruction information or receiving third data sent by the access network device, adjusting a modulation and coding policy of a terminal device according to the modulation and coding policy adjustment instruction.

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

the processing unit 2202 is configured to send, through the communication unit 2201, a random access request to an access network device during a period when the terminal device is in an RRC inactive state; receiving, by the communication unit 2201, transmission instruction information from the access network device, where the transmission instruction information is used to instruct a manner and/or a resource of data transmission by the terminal device; according to the transmission instruction information, data transmission is performed by the communication unit 2201.

In one embodiment, the transmission indication information includes at least one of: a transmission mode switching instruction, a resource instruction and a beam instruction; the transmission mode switching instruction is used for indicating the terminal equipment to switch to the unlicensed scheduling data transmission after the random access process or the random access data transmission is finished; the resource indication is used for indicating the pre-configured authorized resource when the terminal equipment performs the unlicensed scheduling data transmission; the beam indication is used for indicating the corresponding relation between the synchronous signal block and the pre-configured authorized resource.

In one embodiment, when the transmission mode switching instruction is included in the transmission instruction information, the transmission instruction information is carried in a first field of the transmission instruction information;

the processing unit 2202 is specifically configured to: after determining that the random access process or the random access data transmission is finished, performing unlicensed scheduling data transmission by using the pre-configured grant resources through the communication unit 2201; the random access data transmission is two-step random access data transmission or four-step random access data transmission, and the random access process is two-step random access process or four-step random access process.

In one embodiment, when the transmission indication information includes the resource indication, the resource indication is carried in a second field of the transmission indication information, where the second field has a different value, and the resource indication is used to indicate activation of a different preconfigured grant resource.

In one embodiment, when the transmission indication information includes the beam indication, the beam indication is carried in a third field of the transmission indication information, where the beam indication is used to indicate a correspondence between different synchronization signal blocks and the preconfigured grant resources when the third field has a different value.

In one embodiment, the processing unit 2202 is specifically configured to: and receiving, by the communication unit 2201, downlink control information sent by the access network device, where the downlink control information includes the transmission indication information.

In one embodiment, the transmission indication information is carried on a reserved field in the downlink control information.

In one embodiment, the processing unit 2202 is specifically configured to: receiving, by the communication unit 2201, downlink control information sent by the access network device, and receiving the transmission indication information on a physical downlink shared channel PDSCH scheduled by the downlink control information; or receiving, by the communication unit 2201, 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 receiving, by the communication unit 2201, 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 the communication unit 2201 receives 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.

In one embodiment, the PDSCH carries a medium access control MAC control element CE.

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

In one embodiment, the transmission instruction information further includes: a contention-free random access resource indication; the contention-free random access resource indication is used to indicate resources used by the terminal device in a random access procedure or random access data transmission.

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

In one embodiment, the contention-free random access resource indication further comprises: and the PO indication is used for indicating an uplink shared channel used by the terminal equipment in a two-step random access process or a two-step random access data transmission, and is carried in a seventh field of the transmission indication information.

In one embodiment, the processing unit 2202 is further configured to: after receiving the transmission instruction information from the access network device through the communication unit 2201, sending feedback information corresponding to the transmission instruction information to the access network device, where the feedback information is used to feedback whether the terminal device accepts the transmission instruction of the transmission instruction information.

The function of the processing unit 2202 will be described below when the communication device 2200 is applied to an access network apparatus.

In an implementation manner of the present application, the communication apparatus 2200 is applied to an access network device in the first data transmission method provided in the embodiment of the present application, the communication apparatus 2200 may implement functions of the access network device in the data transmission method shown in fig. 6 to fig. 15 of the present application, and the functions of the processing unit 2202 are described as follows:

the processing unit 2202 is configured to receive, by using the communication unit 2201, first data sent by a terminal device in an RRC inactive state through a preconfigured grant resource; transmitting transmission instruction information to the terminal device through the communication unit 2201, where the transmission instruction information is used to instruct the terminal device to switch a data transmission mode or continue data transmission; the second data transmitted by the terminal device is received through the communication unit 2201, or the third data is transmitted to the terminal device.

In one embodiment, the transmission indication information includes at least one of: a power control instruction, a transmission mode switching instruction, a correct response of the first data, physical Uplink Shared Channel (PUSCH) scheduling information, physical Downlink Shared Channel (PDSCH) scheduling information, a time advance adjustment instruction and a modulation and coding strategy adjustment instruction; wherein the power control instruction is used for indicating the sending power of the second data sent by the terminal equipment; the transmission mode switching instruction is used for instructing the terminal equipment to switch the data transmission mode; the correct response of the first data is used for indicating the access network equipment to receive the first data; the PUSCH scheduling information is used for indicating the terminal equipment to send second data on the scheduled PUSCH; the PDSCH scheduling information is used for indicating the terminal equipment to receive third data on the scheduled PDSCH; the time advance adjustment instruction is used for indicating the terminal equipment to adjust the time advance; the modulation and coding strategy adjustment instruction is used for instructing the terminal equipment to adjust the modulation and coding strategy.

In one embodiment, 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; and when the values of the first fields are different, the power control instruction is used for indicating different sending powers.

In one embodiment, when the transmission instruction information includes the transmission mode switching instruction, the transmission mode switching instruction includes: identification of a target data transmission mode and/or a power threshold; the identification of the target transmission mode is carried in a second field of the transmission indication information, and when the values of the second field are different, the target transmission mode is used for indicating different data transmission modes; the power threshold is a receiving power threshold of the reference signal, the power threshold is carried in a third field of the transmission indication information, and when the values of the third field are different, the values of the power threshold are different.

In one embodiment, the processing unit 2202 is specifically configured to: receiving, by the communication unit 2201, 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 after the terminal device returns from the RRC inactive state to the RRC connected state through the two-step random access procedure or the four-step random access procedure.

In one embodiment, the contention-free random access resource indication further comprises: and the Physical Uplink Shared Channel (PUSCH) opportunity (PO) indication is used for indicating an uplink shared channel used in the two-step random access process, and the PO indication is carried in a seventh field of the transmission indication information.

In one embodiment, the processing unit 2202 is specifically configured to: receiving, by the communication unit 2201, the second data transmitted by the terminal device through a process of transmitting the first data when a correct response of the first data is included in the transmission instruction information; when the transmission instruction information does not include the correct response of the first data, receiving, by the communication unit 2201, second data transmitted by the terminal device through a process of transmitting the first data; wherein the second data is identical to the first data, or the second data and the first data have the same information bit, or the second data and the first data have the same valid information, or the second data is a redundancy version of the first data.

In one embodiment, the processing unit 2202 is specifically configured to: when the transmission instruction information includes the PDSCH scheduling information, the third data is transmitted to the terminal device on the PDSCH scheduled by the PDSCH scheduling information by the communication unit 2201.

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 send the sending power of the feedback information corresponding to the PDSCH; and the feedback power control instruction is carried in an eighth field of the transmission instruction information, and when the values of the eighth field are different, the feedback power control instruction is used for indicating different sending powers.

In one embodiment, the processing unit 2202 is further configured to: when the transmission indication information does not include the correct response of the first data and the power control indication, sending, by the communication unit 2201, a radio resource control RRC signaling to the terminal device, where the RRC signaling includes configuration information indicating that the terminal device uses the feedback power control indication as a power control indication.

In one embodiment, the RRC signaling includes a correct acknowledgement response of the first data; or the processing unit 2202, is further configured to: after transmitting the transmission instruction information to the terminal device through the communication unit 2201, transmitting a medium access control MAC control element CE including a correct response corresponding to the first data to the terminal device through the communication unit 2201.

In one embodiment, the PUSCH scheduling information is retransmission PUSCH scheduling information or new PUSCH scheduling information; the processing unit 2202 is specifically configured to: when the PUSCH scheduling information is retransmission PUSCH scheduling information, receiving, by the communication unit 2201, second data sent by the terminal device on a PUSCH scheduled by the retransmission PUSCH scheduling information, where the second data is the same as the first data, or information bits of the second data and the first data are the same, or valid information of the second data and the first data is the same, or the second data is a redundancy version of the first data; and when the PUSCH scheduling information is new PUSCH scheduling information, receiving, by the communication unit 2201, second data sent by the terminal device on a PUSCH scheduled by the new PUSCH scheduling information.

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

the processing unit 2202 is configured to receive, by using the communication unit 2201, a random access request from a terminal device in an RRC inactive state; transmitting, by the communication unit 2201, transmission instruction information to the terminal device, where the transmission instruction information includes a resource instruction, where the resource instruction is used to instruct the terminal device to perform data transmission and/or resources.

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

In one embodiment, when the transmission indication information includes the beam indication, the beam indication is carried in a third field of the transmission indication information, where the third field has a different value, the beam indication is used to indicate a correspondence between different synchronization signal blocks and the preconfigured grant resource.

In one embodiment, the processing unit 2202 is specifically configured to: and sending downlink control information to the terminal device through the communication unit 2201, where the downlink control information includes the transmission instruction information.

In one embodiment, the processing unit 2202 is specifically configured to: transmitting downlink control information to the terminal equipment through the communication unit 2201, and transmitting the transmission instruction information on a physical downlink shared channel PDSCH scheduled by the downlink control information; or sending, by the communication unit 2201, 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 is carried on the PDSCH; or transmitting, by the communication unit 2201, collision resolution information to the terminal device, where the collision resolution information includes the transmission instruction information, and the collision resolution information is carried on the PDSCH; or sending, by the communication unit 2201, 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 processing unit 2202 is further configured to: after the access network device sends the transmission instruction information to the terminal device, the communication unit 2201 receives feedback information corresponding to the transmission instruction information from the terminal device, where the feedback information is used to feedback whether the terminal device accepts the transmission instruction of the transmission instruction information.

Based on the same technical concept, the present application also provides a communication apparatus 2300. The communication device 2300 may be used to implement the functionality of a terminal device or an 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. Wherein 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 standard (peripheral component interconnect, PCI) bus, or an extended industry standard architecture (extended industry standard architecture, EISA) bus, among others. The buses may be classified as address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in fig. 23, but not only one bus or one type of bus.

The communication interface 2301 is configured to receive and send data, and implement communication interaction with other devices. By way of example, the communication interface 2301 may be a transceiver, circuit, bus, module, or other type of communication interface.

In one embodiment of the present application, the communication device 2300 may implement the functions of the terminal device in the data transmission method shown in fig. 6 to 15 of the present application, and the functions of the processor 2302 are described as follows:

a processor 2302, configured to send, during an RRC inactive state of the terminal device, first data to the access network device through the communication interface 2301 by pre-configuring authorized resources; receiving transmission indication information from the access network device through the communication interface 2301, where the transmission indication information is used to instruct the terminal device to switch a data transmission mode or continue data transmission; and according to the transmission indication information, sending second data to the access network equipment or receiving third data sent by the access network equipment through the communication interface 2301.

the processor 2302 is specifically configured to: determining the target sending power indicated by the power control indication according to the value of the first field in the transmission indication information; and transmitting the second data to the access network device through the communication interface 2301 according to the target transmission power indicated by the power control indication.

In one embodiment, when the transmission mode switching indication includes an identification of the target data transmission mode, the processor 2302 is specifically configured to: when the identifier of the target transmission mode is determined to be the identifier corresponding to the two-step random access data transmission, the second data is sent to the access network device through the communication interface 2301 by a two-step random access process; or when the identifier of the target transmission mode is determined to be the identifier corresponding to the two-step random access process, after the two-step random access process is recovered from the RRC inactive state to the RRC connection state, sending the second data to the access network device through the communication interface 2301; or when the identifier of the target transmission mode is determined to be the identifier corresponding to the four-step random access data transmission, sending the second data to the access network device through the communication interface 2301 by a four-step random access process; or when the identifier of the target transmission mode is determined to be the identifier corresponding to the four-step random access process, after the four-step random access process is recovered 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.

In one embodiment, the processor 2302 is specifically configured to: when the transmission mode switching indication comprises the power threshold, determining the power threshold according to the value of a third field in the transmission indication information; when the reference signal received power is determined to be greater than the power threshold, sending the second data to the access network device through the communication interface 2301 by a two-step random access process, or after recovering from an RRC inactive state to an RRC connected state by a two-step random access process, sending the second data to the access network device through the communication interface 2301; or when the reference signal received power is determined to be less than or equal to the power threshold, the second data is sent to the access network device through the communication interface 2301 by a four-step random access procedure, or after the RRC inactive state is restored to the RRC connected state by the four-step random access procedure, the second data is sent to the access network device through the communication interface 2301.

In one embodiment, the processor 2302 is specifically configured to: when the transmission mode switching indication comprises the identification of the target data transmission mode and the power threshold value, determining the power threshold value according to the value of a third field in the transmission indication information; when the identifier of the target data transmission mode is determined to be the identifier corresponding to the random access data transmission, and the reference signal receiving power is greater than the power threshold, sending second data to the access network device through the communication interface 2301 by a two-step random access process; or when the identifier of the target data transmission mode is determined to be the identifier corresponding to the random access process and the reference signal received power is greater than the power threshold, after the two-step random access process is recovered from the RRC inactive state to the RRC connected state, sending second data to the access network equipment through the communication interface 2301; or when the identifier of the target data transmission mode is determined to be the identifier corresponding to the random access data transmission, and the reference signal receiving power is smaller than or equal to the power threshold, sending second data to the access network device through the communication interface 2301 by a four-step random access process; or when the identifier of the target data transmission mode is determined to be the identifier corresponding to the random access process and the reference signal receiving power is smaller than or equal to the power threshold, after the RRC inactive state is recovered to the RRC connected state through the four-step random access process, sending second data to the access network device through the communication interface 2301.

In one embodiment, the processor 2302 is specifically configured to: if the transmission indication information comprises a correct response of the first data; transmitting the second data to the access network device through the communication interface 2301 by a process of transmitting the first data;

if the transmission indication information does not include the correct response of the first data, sending the second data to the access network device through the communication interface 2301 by a process of sending the first data; wherein the second data is identical to the first data, or the second data and the first data have the same information bit, or the second data and the first data have the same valid information, or the second data is a redundancy version of the first data.

In one embodiment, the processor 2302 is specifically configured to: when the transmission indication information comprises the PDSCH scheduling information, determining the PDSCH scheduled by the transmission indication information according to the PDSCH scheduling information; the third data is received over the PDSCH scheduled by the transmission instruction information through the communication interface 2301.

In one embodiment, the processor 2302 is further configured to: if the transmission indication information does not include the correct response of the first data and the power control indication, receiving, by the communication interface 2301, a radio resource control RRC signaling sent by the access network device, where the RRC signaling includes configuration information indicating that the terminal device uses the feedback power control indication as a power control indication; determining the sending power indicated by the feedback power control indication according to the value of the eighth field in the transmission indication information; and transmitting the second data to the access network device through the communication interface 2301 according to the transmission power indicated by the feedback power control indication.

In one embodiment, the RRC signaling includes a correct acknowledgement response of the first data; or the processor 2302 is further configured to: after receiving the transmission indication information from the access network device through the communication interface 2301, receiving a media access control MAC control element CE sent by the access network device, where the MAC CE includes a correct response of the first data.

The processor 2302 is specifically configured to: when the PUSCH scheduling information is retransmission PUSCH scheduling information, sending the second data to the access network device through the communication interface 2301 on a PUSCH scheduled by the retransmission PUSCH scheduling information, wherein the second data is the same as the first data, or information bits of the second data and the first data are the same, or effective information of the second data and the first data is the same, or the second data is a redundancy version of the first data; and when the PUSCH scheduling information is new PUSCH scheduling information, sending the second data to the access network device through the communication interface 2301 on a PUSCH scheduled by the new PUSCH scheduling information.

In one embodiment, the processor 2302 is further configured to: before sending second data to the access network device or receiving third data sent by the access network device through the communication interface 2301 according to the transmission indication information, determining a target time advance according to the time advance adjustment indication, and adjusting the time advance of the terminal device according to the target time advance.

In one embodiment, the processor 2302 is further configured to: before sending second data to the access network device or receiving third data sent by the access network device through the communication interface 2301 according to the transmission instruction information, adjusting a modulation and coding policy of a terminal device according to the modulation and coding policy adjustment instruction.

In another embodiment of the present application, the communication device 2300 may implement the functions of the terminal device in the data transmission method shown in fig. 16 and fig. 19 to fig. 21, and the functions of the processor 2302 are described as follows:

the processor 2302 is configured to send a random access request to an access network device through the communication interface 2301 during an RRC inactive state of the terminal device; and receiving, by the communication interface 2301, transmission instruction information from the access network device, where the transmission instruction information is used to instruct a manner and/or a resource of data transmission by the terminal device; according to the transmission instruction information, data transmission is performed through the communication interface 2301.

the processor 2302 is specifically configured to: after determining that the random access process or the random access data transmission is finished, performing unlicensed scheduling data transmission through the communication interface 2301 by using the pre-configured grant resources; the random access data transmission is two-step random access data transmission or four-step random access data transmission, and the random access process is two-step random access process or four-step random access process.

In one embodiment, the processor 2302 is specifically configured to: and receiving downlink control information sent by the access network device through the communication interface 2301, where the downlink control information includes the transmission indication information.

In one embodiment, the processor 2302 is specifically configured to: receiving downlink control information sent by the access network device through the communication interface 2301, and receiving the transmission indication information on a physical downlink shared channel PDSCH scheduled by the downlink control information; or receiving, by the communication interface 2301, 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 receiving conflict resolution information sent by the access network 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 receiving radio resource control RRC signaling sent by the access network device through the communications interface 2301, where the RRC signaling includes the transmission indication information, and the RRC signaling is carried on the PDSCH.

In one embodiment, the processor 2302 is further configured to: after receiving the transmission instruction information from the access network device through the communication interface 2301, sending feedback information corresponding to the transmission instruction information to the access network device, where the feedback information is used to feedback whether the terminal device accepts the transmission instruction of the transmission instruction information.

In one embodiment of the present application, the communication apparatus 2300 may implement the function of the access network device in the data transmission method shown in fig. 6 to 15 of the present application, and the function of the processor 2302 is described as follows:

the processor 2302 is configured to receive, through the communication interface 2301, first data sent by a terminal device in an RRC inactive state through a preconfigured grant resource; transmitting transmission instruction information to the terminal device through the communication interface 2301, where the transmission instruction information is used to instruct the terminal device to switch a data transmission mode or continue data transmission; the second data sent by the terminal device is received through the communication interface 2301, or the third data is sent to the terminal device.

In one embodiment, the processor 2302 is specifically configured to: receiving second data sent by the terminal device through the two-step random access procedure or the four-step random access procedure through the communication interface 2301; or receives the second data sent by the terminal device after recovering from the RRC inactive state to the RRC connected state through the two-step random access procedure or the four-step random access procedure through the communication interface 2301.

In one embodiment, the processor 2302 is specifically configured to: when the transmission instruction information includes a correct response of the first data, receiving, through the communication interface 2301, the second data transmitted by the terminal device through a process of transmitting the first data; when the transmission instruction information does not include a correct response of the first data, receiving, through the communication interface 2301, second data transmitted by the terminal device through a process of transmitting the first data; wherein the second data is identical to the first data, or the second data and the first data have the same information bit, or the second data and the first data have the same valid information, or the second data is a redundancy version of the first data.

In one embodiment, the processor 2302 is specifically configured to: when the transmission instruction information includes the PDSCH scheduling information, the third data is transmitted to the terminal device on the PDSCH scheduled by the PDSCH scheduling information through the communication interface 2301.

In one embodiment, the processor 2302 is further configured to: and when the transmission indication information does not include the correct response of the first data and the power control indication, sending a Radio Resource Control (RRC) signaling to the terminal equipment through the communication interface 2301, wherein the RRC signaling includes configuration information for indicating the terminal equipment to take the feedback power control indication as the power control indication.

In one embodiment, the RRC signaling includes a correct acknowledgement response of the first data; or the processor 2302 is further configured to: after transmitting transmission instruction information to the terminal device through the communication interface 2301, a medium access control MAC control element CE is transmitted to the terminal device through the communication interface 2301, where the MAC CE includes a correct response corresponding to the first data.

In one embodiment, the PUSCH scheduling information is retransmission PUSCH scheduling information or new PUSCH scheduling information; the processor 2302 is specifically configured to: when the PUSCH scheduling information is retransmission PUSCH scheduling information, receiving second data sent by the terminal device on a PUSCH scheduled by the retransmission PUSCH scheduling information through the communication interface 2301, wherein the second data is the same as the first data, or information bits of the second data and the first data are the same, or effective information of the second data and the first data is the same, or the second data is a redundancy version of the first data; and when the PUSCH scheduling information is new PUSCH scheduling information, receiving, by the communication interface 2301, second data sent by the terminal device on a PUSCH scheduled by the new PUSCH scheduling information.

In another embodiment of the present application, the communication apparatus 2300 may implement the functions of the access network device in the data transmission method shown in fig. 16 and fig. 19 to fig. 21 of the present application, and the functions of the processor 2302 are described as follows:

the processor 2302 is configured to receive a random access request from a terminal device in an RRC inactive state through the communication interface 2301; and transmitting transmission indication information to the terminal equipment through the communication interface 2301, wherein the transmission indication information comprises a resource indication, and the resource indication is used for indicating a mode and/or a resource of the terminal equipment for data transmission.

In one embodiment, the processor 2302 is specifically configured to: and sending downlink control information to the terminal device through the communication interface 2301, where the downlink control information includes the transmission instruction information.

In one embodiment, the processor 2302 is specifically configured to: transmitting downlink control information to the terminal equipment through the communication interface 2301, and transmitting the transmission indication information on a physical downlink shared channel PDSCH scheduled by the downlink control information; or sending random access response information to the terminal device through the communication interface 2301, wherein the random access response information includes the transmission indication information, and the random access response information is borne on the PDSCH; or transmitting 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 sending radio resource control RRC signaling to the terminal device through the communication interface 2301, where the RRC signaling includes the transmission indication information, and the RRC signaling is carried on the PDSCH.

In one embodiment, the processor 2302 is further configured to: after the access network device sends the transmission instruction information to the terminal device, the communication interface 2301 receives feedback information corresponding to the transmission instruction information from the terminal device, where the feedback information is used to feedback whether the terminal device accepts the transmission instruction of the transmission instruction information.

The memory 2303 is used for storing program instructions, data, and the like. In particular, the program instructions may comprise program code comprising computer-operating instructions. The memory 2303 may include random access memory (random access memory, RAM) and may also include non-volatile memory (non-volatile memory), such as at least one disk memory. The processor 2302 executes the program instructions stored in the memory 2303 and uses the data stored in the memory 2303 to implement the functions described above, thereby implementing the data transmission method provided in the above embodiment.

It will be appreciated that the memory in fig. 23 of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (Double Data Rate SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

Based on the above embodiments, the present application further provides a computer program, which when executed on a computer, causes the computer to execute the data transmission method provided by the embodiments shown in fig. 6 to 15 or fig. 16, and fig. 19 to 21.

Based on the above embodiments, the present application further provides a computer-readable storage medium having stored therein a computer program which, when executed by a computer, causes the computer to execute the data transmission method provided by the embodiments shown in fig. 6 to 15 or fig. 16, and fig. 19 to 21. Wherein a storage medium may be any available medium that can be accessed by a computer. Taking this as an example but not limited to: the computer readable medium may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.

Based on the above embodiments, the embodiments of the present application provide a communication system, which includes a terminal device and an access network device, where the terminal device and the access network device may implement the data transmission method provided by the embodiments shown in fig. 6 to 15 or fig. 16, and fig. 19 to 21.

Based on the above embodiments, the embodiments of the present application further provide a chip, where the chip is configured to read a computer program stored in a memory, to implement the data transmission method provided by the embodiments shown in fig. 6 to 15 or fig. 16, and fig. 19 to 21.

Based on the above embodiments, the embodiments of the present application provide a chip system, which includes a processor for supporting a computer device to implement the functions related to the terminal device or the access network device in the embodiments shown in fig. 6 to 15 or fig. 16, and fig. 19 to 21. In one possible design, the chip system further includes a memory for storing programs and data necessary for the computer device. The chip system can be composed of chips, and can also comprise chips and other discrete devices.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or 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, and the like) 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 application. It will be understood that each flow and/or block of 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 a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims

A method of data transmission, the method comprising:

in the RRC inactive state process, the terminal equipment sends first data to the access network equipment through pre-configuring authorized resources;

receiving transmission indication information from the access network equipment, wherein the transmission indication information is used for indicating switching of a data transmission mode or continuous data transmission;

and sending second data to the access network equipment or receiving third data sent by the access network equipment according to the transmission indication information.
The method of claim 1, wherein the transmission indication information comprises at least one of: a power control instruction, a transmission mode switching instruction, a correct response of the first data, physical Uplink Shared Channel (PUSCH) scheduling information, physical Downlink Shared Channel (PDSCH) scheduling information, a time advance adjustment instruction and a modulation and coding strategy adjustment instruction;

wherein the power control indication is used for indicating a transmission power for transmitting the second data;

the transmission mode switching instruction is used for indicating switching of the data transmission mode;

the correct response of the first data is used for indicating the access network equipment to receive the first data;

the PUSCH scheduling information is used for indicating to send second data on the scheduled PUSCH;

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

the time advance adjustment indication is used for indicating to adjust the time advance;

the modulation and coding strategy adjustment indication is used for indicating adjustment of the modulation and coding strategy.
The method of claim 2, wherein when the power control indication is included in the transmission indication information, the power control indication is carried in a first field of the transmission indication information; when the values of the first fields are different, the power control instruction is used for indicating different sending powers;

And sending second data to the access network equipment according to the transmission indication information, wherein the second data comprises:

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

and transmitting the second data to the access network equipment according to the target transmitting power indicated by the power control indication.
A method according to claim 2 or 3, wherein when the transmission mode switching instruction is included in the transmission instruction information, the transmission mode switching instruction includes: identification of a target data transmission mode and/or a power threshold; the identification of the target transmission mode is carried in a second field of the transmission indication information, and when the values of the second field are different, the identification of the target transmission mode is used for indicating the identifications of different data transmission modes; the power threshold is a receiving power threshold of the reference signal, the power threshold is carried in a third field of the transmission indication information, and when the values of the third field are different, the values of the power threshold are different.
The method of claim 4, wherein when the transmission mode switching indication includes an identification of the target data transmission mode, the sending the second data to the access network device according to the transmission indication information includes:

When the identification of the target transmission mode is determined to be the identification corresponding to the two-step random access data transmission, the second data is sent to the access network equipment through a two-step random access process; or (b)

When the identification of the target transmission mode is determined to be the identification corresponding to the two-step random access process, after the two-step random access process is recovered from the RRC inactive state to the RRC connection state, the second data is sent to the access network equipment; or (b)

When the identification of the target transmission mode is determined to be the identification corresponding to the four-step random access data transmission, the second data is sent to the access network equipment through a four-step random access process; or (b)

And when the identification of the target transmission mode is determined to be the identification corresponding to the four-step random access process, after the four-step random access process is recovered from the RRC inactive state to the RRC connection state, the second data is sent to the access network equipment.
The method of claim 4, wherein when the transmission mode switch indication includes the power threshold, the sending the second data to the access network device according to the transmission indication information comprises:

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

When the received power of the reference signal is determined to be larger than the power threshold, sending the second data to the access network equipment through a two-step random access process, or after recovering from an RRC inactive state to an RRC connected state through the two-step random access process, sending the second data to the access network equipment; or alternatively

And when the reference signal receiving power is determined to be smaller than or equal to the power threshold, sending the second data to the access network equipment through a four-step random access process, or after the RRC inactive state is recovered to the RRC connection state through the four-step random access process, sending the second data to the access network equipment.
The method of claim 4, wherein when the transmission mode switch indication includes an identification of the target data transmission mode and the power threshold, the sending the second data to the access network device according to the transmission indication information comprises:

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

when the identification of the target data transmission mode is determined to be the identification corresponding to the random access data transmission, and the reference signal receiving power is larger than the power threshold, sending second data to the access network equipment through a two-step random access process; or (b)

When the identification of the target data transmission mode is determined to be the identification corresponding to the random access process and the reference signal received power is larger than the power threshold, after the RRC inactive state is recovered to the RRC connection state through the two-step random access process, second data is sent to the access network equipment; or (b)

When the identification of the target data transmission mode is determined to be the identification corresponding to the random access data transmission, and the reference signal receiving power is smaller than or equal to the power threshold, second data is sent to the access network equipment through a four-step random access process; or (b)

And when the identification of the target data transmission mode is determined to be the identification corresponding to the random access process and the reference signal receiving power is smaller than or equal to the power threshold, after the RRC inactive state is recovered to the RRC connected state through the four-step random access process, sending second data to the access network equipment.
The method according to any one of claims 4-7, wherein the transmission instruction information further includes: 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:

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

the random access preamble index value is carried in a fourth field of the transmission indication information; the synchronization signal block index value is carried in a fifth field of the transmission indication information, and the RO resource index value or the RO resource index value range is carried in a sixth field of the transmission indication information.
The method of claim 9, wherein the contention-free random access resource indication further comprises: and the Physical Uplink Shared Channel (PUSCH) opportunity (PO) indication is used for indicating an uplink shared channel used in the two-step random access process, and the PO indication is carried in a seventh field of the transmission indication information.
A method according to any of claims 2-10, wherein if a correct response of said first data is included in said transmission indication information; and sending second data to the access network equipment according to the transmission indication information, wherein the second data comprises:

Transmitting the second data to the access network equipment through the process of transmitting the first data;

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

transmitting the second data to the access network equipment through the process of transmitting the first data; wherein the second data is identical to the first data, or the second data and the first data have the same information bit, or the second data and the first data have the same valid information, or the second data is a redundancy 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 third data sent by the access network device according to the transmission indication information includes:

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

and receiving the third data on the PDSCH scheduled by the transmission indication information.
The method of claim 12, wherein the transmitting the indication information further comprises: and the feedback power control instruction is used for indicating the sending power of the feedback information corresponding to the PDSCH, and is carried in an eighth field of the transmission instruction information, and when the values of the eighth field are different, the feedback power control instruction is used for indicating different sending powers.
The method of claim 13, further comprising, after receiving the transmission indication information from the access network device if the transmission indication information does not include the correct acknowledgement response of the first data and the power control indication:

receiving Radio Resource Control (RRC) signaling sent by the access network equipment, wherein the RRC signaling comprises configuration information for indicating the terminal equipment to take the feedback power control indication as a power control indication;

and sending second data to the access network equipment according to the transmission indication information, wherein the second data comprises:

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

and transmitting the second data to the access network equipment according to the transmission power indicated by the feedback power control instruction.
The method of claim 14, wherein the RRC signaling includes a correct acknowledgement response for the first data; or alternatively

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

and receiving a Media Access Control (MAC) Control Element (CE) sent by the access network equipment, wherein the MAC CE comprises a correct response of the first data.
The method of claim 2, wherein the PUSCH scheduling information is retransmission PUSCH scheduling information or new PUSCH scheduling information;

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

transmitting the second data to the access network equipment on the PUSCH scheduled by the retransmission PUSCH scheduling information, wherein the second data is identical to the first data, or the information bits of the second data and the first data are identical, or the effective information of the second data and the first data is identical, or the second data is a redundancy version of the first data;

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

and sending the second data to the access network equipment on the PUSCH scheduled by the new PUSCH scheduling information.
The method according to any of claims 2-16, wherein when the transmission indication information comprises the time advance adjustment indication, the time advance adjustment indication is carried on a ninth field of the transmission indication information.
The method of claim 17, further comprising, prior to transmitting second data to the access network device or receiving third data transmitted by the access network device in accordance with the transmission indication information:

and determining a target time advance according to the time advance adjustment instruction, and adjusting the time advance according to the target time advance.
The method according to any one of claims 2-18, wherein when the transmission indication information includes the modulation and coding scheme adjustment indication, the modulation and coding scheme adjustment indication is carried on a tenth field of the transmission indication information, and when the tenth field is different in value, the modulation and coding scheme adjustment indication is used to indicate a different modulation and coding scheme.
The method of claim 19, further comprising, prior to transmitting second data to the access network device or receiving third data transmitted by the access network device in accordance with the transmission indication information:

and adjusting the modulation and coding strategy according to the modulation and coding strategy adjustment instruction.
A method of data transmission, the method comprising:

Receiving first data sent by terminal equipment in an RRC inactive state process through a pre-configured authorized resource;

transmitting transmission indication information to the terminal equipment, wherein the transmission indication information is used for indicating the terminal equipment to switch a data transmission mode or continue data transmission;

and receiving the second data sent by the terminal equipment or sending the third data to the terminal equipment.
A method of data transmission, the method comprising:

in the RRC inactive state process, the terminal equipment sends a random access request to the access network equipment;

receiving transmission indication information from the access network equipment, wherein the transmission indication information is used for indicating a data transmission mode and/or resource;

and carrying out data transmission according to the transmission indication information.
The method of claim 22, wherein the transmission indication information comprises at least one of:

a transmission mode switching instruction, a resource instruction and a beam instruction;

the transmission mode switching instruction is used for indicating a random access process or switching to unlicensed scheduling data transmission after the random access data transmission is finished;

the resource indication is used for indicating a pre-configured authorized resource when the data transmission is scheduled without authorization;

The beam indication is used for indicating the corresponding relation between the synchronous signal block and the pre-configured authorized resource.
The method of claim 23, wherein when the transmission mode switching indication is included in the transmission indication information, the transmission indication information is carried in a first field of the transmission indication information;

the data transmission according to the transmission indication information comprises the following steps:

after the random access process or the random access data transmission is finished, using the pre-configured authorized resources to perform the unauthorized scheduling data transmission;

the random access data transmission is two-step random access data transmission or four-step random access data transmission, and the random access process is two-step random access process or four-step random access process.
The method according to claim 23 or 24, wherein when the transmission indication information comprises the resource indication, the resource indication is carried in a second field of the transmission indication information, wherein the second field has a different value, and the resource indication is used for indicating activation of a different pre-configured grant resource.
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, and wherein when the third field has a different value, the beam indication is used to indicate a correspondence between different synchronization signal blocks and the preconfigured grant resources.
The method according to any of claims 22 to 26, wherein said receiving transmission indication information from the access network device comprises:

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

receiving downlink control information sent by the access network equipment, and receiving the transmission indication information on a Physical Downlink Shared Channel (PDSCH) scheduled by the downlink control information; or alternatively

Receiving random access response information sent by the access network equipment, wherein the random access response information comprises the transmission indication information, and the random access response information is borne on the PDSCH; or alternatively

Receiving conflict resolution information sent by the access network equipment, wherein the conflict resolution information comprises the transmission indication information, and the conflict resolution information is borne on the PDSCH; or alternatively

And receiving Radio Resource Control (RRC) signaling sent by the access network equipment, wherein the RRC signaling comprises the transmission indication information, and the RRC signaling is born on the PDSCH.
The method of claim 29, wherein the PDSCH carries a medium access control, MAC, control element, CE.
The method of claim 30, wherein the transmission indication information is carried on an undefined logical channel in the MAC CE.
The method of any one of claims 22 to 31, wherein the transmitting the 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 a random access procedure or a 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:

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

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

and sending feedback information corresponding to the transmission indication information to the access network equipment, wherein the feedback information is used for feeding back whether to accept the transmission indication of the transmission indication information.
A method of data transmission, the method comprising:

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

and sending transmission indication information to the terminal equipment, wherein the transmission indication information is used for indicating the mode and/or the resource of the terminal equipment for data transmission.
A communication device for implementing the method of any one of claims 1-20 or claim 21 or claims 22-35 or claim 36.
A communications device comprising a processor and a memory coupled to the processor, the processor configured to perform the method of any one of claims 1-20 or claim 21 or claims 22-35 or claim 36.
A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program which, when executed by a computer, causes the computer to perform the method of any of claims 1-20 or claim 21 or claims 22-35 or claim 36.
A communication system comprising a terminal device for performing the method of any of claims 1-20 or claims 22-35 and an access network device for performing the method of claim 21 or claim 36.