US-20260129519-A1 - COMMUNICATION METHOD AND APPARATUS

Abstract

A communication method and apparatus relating to the field of communication technologies are provided, to resolve problems of high latency in transition from downlink receiving to uplink sending and a waste of resources. The method may include: The communication apparatus determines a first symbol, where the first symbol includes a first interval, and further includes a second interval and/or a third interval, the first interval is used for transition from downlink transmission to uplink transmission and serves as a reserved resource or a guard period, the second interval is used for uplink transmission, and the third interval is used for downlink transmission; and sending first indication information, where the first indication information indicates the first symbol.

Inventors

• Na Gao
• Hao Tang
• Ting Wang
• Lei Dong
• Dongdong Wei
• Jianglei Ma

Assignees

• HUAWEI TECHNOLOGIES CO., LTD.

Dates

Publication Date

20260507

Application Date

20251219

Claims (20)

1. 1 . A communication method, wherein the method comprises: determining a first symbol, wherein the first symbol comprises a first interval and a second interval, or comprises a first interval and a third interval, or comprises a first interval, a second interval, and a third interval, the first interval is used for transition from downlink transmission to uplink transmission and serves as a reserved resource or a guard period, the second interval is used for uplink transmission, and the third interval is used for downlink transmission; and sending first indication information, wherein the first indication information indicates the first symbol.
2. 2 . The method according to claim 1 , wherein the first indication information indicates at least one of the following: a starting position of the first interval in the first symbol, duration corresponding to the first interval, a proportion of the duration of the first interval in duration of the first symbol, duration of the second interval in the first symbol, a proportion of the duration of the second interval in the duration of the first symbol, duration of the third interval in the first symbol, or a proportion of the duration of the third interval in the duration of the first symbol.
3. 3 . The method according to claim 2 , wherein the first symbol is pre-configured as follows: the starting position of the first interval is a starting position of the first symbol, or an ending position of the first interval is an ending position of the first symbol, or the starting position or the ending position of the first interval is a middle position of the first symbol, or the starting position of the first interval is a position other than the starting position and the ending position at the first symbol, or the ending position of the first interval is a position other than the starting position and the ending position at the first symbol, or the starting position and the ending position of the first interval are positions other than the starting position and the ending position at the first symbol.
4. 4 . The method according to claim 1 , wherein the first indication information comprises a first index value, and the first index value corresponds to a first position and first duration, wherein the first position indicates a starting position of the first interval in the first symbol, and the first duration indicates duration of the first interval in the first symbol; or the first indication information comprises a second index value, and the second index value corresponds to second duration and third duration, wherein the second duration indicates duration of the third interval in the first symbol, and the third duration indicates duration of the second interval in the first symbol.
5. 5 . The method according to claim 1 , wherein the first indication information is carried in at least one of the following: a system information block (SIB1), a radio resource control RRC signal, downlink control information DCI, or sidelink control information (SCI).
6. 6 . The method according to claim 1 , wherein the method further comprises: receiving capability information of a first apparatus, wherein the capability information indicates at least one of the followings: whether the first apparatus supports the first symbol, or a type of the supported first symbol.
7. 7 . The method according to claim 6 , wherein the capability information comprises at least one of the following: information about whether the first apparatus supports the first symbol, information about the type of the first symbol supported by the first apparatus, information about a transition period supported by the first apparatus, or information about a capability of the first apparatus for transition from receiving a downlink signal to sending an uplink signal.
8. 8 . A communication method, wherein the method comprises: determining a first slot format, wherein the first slot format comprises at least one first symbol, the first symbol comprises a first interval and a second interval, or comprises a first interval and a third interval, or comprises a first interval, a second interval, and a third interval, the first interval is used for transition from downlink transmission to uplink transmission and serves as a reserved resource or a guard period, the second interval is used for uplink transmission, and the third interval is used for downlink transmission; and sending second indication information indicating the first slot format.
9. 9 . The method according to claim 8 , wherein the second indication information indicates position information of the at least one first symbol.
10. 10 . The method according to claim 8 , wherein the first symbol is a last symbol of a downlink channel, or the first symbol is a 1 st symbol of an uplink channel.
11. 11 . The method according to claim 9 , wherein the second indication information indicates a sequence number of the at least one first symbol in the first slot format.
12. 12 . The method according to claim 8 , wherein the second indication information indicates information about the first symbol comprised in an uplink transmission symbol, a downlink transmission symbol, a flexible symbol, a frame structure, or a mini-slot.
13. 13 . The method according to claim 8 , wherein the second indication information is carried in at least one of the following: a system information block SIB1, a radio resource control RRC signal, downlink control information DCI, side control information SCI, or a slot format indicator SFI.
14. 14 . The method according to claim 8 , wherein the method further comprises: receiving/sending capability information of a first apparatus, wherein the capability information indicates at least one of the followings: whether the first apparatus supports the first symbol, or a type of the supported first symbol.
15. 15 . The method according to claim 13 , wherein the capability information comprises at least one of the following: information about whether the first apparatus supports the first symbol, information about the type of the first symbol supported by the first apparatus, information about a transition period supported by the first apparatus, or information about a capability of the first apparatus for transition from receiving a downlink signal to sending an uplink signal.
16. 16 . A communication apparatus, comprising a processor, the processor is configured to, when executing the programming instructions, enable the communication apparatus to: determining a first symbol, wherein the first symbol comprises a first interval and a second interval, or comprises a first interval and a third interval, or comprises a first interval, a second interval, and a third interval, the first interval is used for transition from downlink transmission to uplink transmission and serves as a reserved resource or a guard period, the second interval is used for uplink transmission, and the third interval is used for downlink transmission; and sending first indication information, wherein the first indication information indicates the first symbol.
17. 17 . The apparatus according to claim 16 , wherein the first indication information indicates at least one of the following: a starting position of the first interval in the first symbol, duration corresponding to the first interval, a proportion of the duration of the first interval in duration of the first symbol, duration of the second interval in the first symbol, a proportion of the duration of the second interval in the duration of the first symbol, duration of the third interval in the first symbol, or a proportion of the duration of the third interval in the duration of the first symbol.
18. 18 . The apparatus according to claim 17 , wherein the first symbol is pre-configured as follows: the starting position of the first interval is a starting position of the first symbol, or an ending position of the first interval is an ending position of the first symbol, or the starting position or the ending position of the first interval is a middle position of the first symbol, or the starting position of the first interval is a position other than the starting position and the ending position at the first symbol, or the ending position of the first interval is a position other than the starting position and the ending position at the first symbol, or the starting position and the ending position of the first interval are positions other than the starting position and the ending position at the first symbol.
19. 19 . The apparatus according to claim 16 , wherein the first indication information comprises a first index value, and the first index value corresponds to a first position and first duration, wherein the first position indicates a starting position of the first interval in the first symbol, and the first duration indicates duration of the first interval in the first symbol; or the first indication information comprises a second index value, and the second index value corresponds to second duration and third duration, wherein the second duration indicates duration of the third interval in the first symbol, and the third duration indicates duration of the second interval in the first symbol.
20. 20 . The apparatus according to claim 16 , wherein the first indication information is carried in at least one of the following: a system information block (SIB1), a radio resource control RRC signal, downlink control information DCI, or sidelink control information (SCI).

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This is a continuation of International Patent Application No. PCT/CN2023/103523, filed on Jun. 28, 2023, the disclosure of which is hereby incorporated by reference in its entirety. TECHNICAL FIELD This application relates to the field of communication technologies, and in particular, to a communication method and apparatus. BACKGROUND With development of wireless communication technologies, today's 5th generation mobile communication technology (5G) system are expected to have higher data transmission criteria such as higher throughput, lower latency, enhanced reliability, and greater connections. To meet the foregoing transmission criteria, techniques like enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), and massive machine type communication (mMTC) are proposed based on the 5G communication system. An existing frame structure includes an uplink symbol and a downlink symbol, respectively used for uplink transmission and downlink transmission. In addition, reserved resources like a guard period (GP) are configured between the downlink symbol and the uplink symbol, for a receiving end to perform transition between downlink receiving and uplink sending. For example, one slot may include 14 symbols, in which there are a maximum of two downlink-to-uplink transitions. The two transitions include 2 GP symbols, and overheads of the 2 GP symbols are equal to 1/7 of the slot. One GP includes round trip time (RTT) between a transmitting end and the receiving end and an uplink-downlink transition latency at the receiving end. In some low latency communication scenarios like URLLC factory scenarios, as the transmitting end device and the receiving end device are not far from each other, RTT is low. However, the reserved resources in the existing frame structure have excessively high overheads, resulting in high latency. SUMMARY Embodiments of this application provide a communication method and apparatus, to resolve problems of high latency in transition from downlink transmission to uplink transmission and a waste of resources. To achieve the foregoing objective, this application adopts the following technical solutions. According to a first aspect, a communication method is provided. The method includes: determining a first symbol, where the first symbol includes a first interval and a second interval, or includes a first interval and a third interval, or includes a first interval, a second interval, and a third interval, the first interval is used for transition from downlink transmission to uplink transmission and serves as a reserved resource or a guard period, the second interval is used for uplink transmission, and the third interval is used for downlink transmission; and sending first indication information, where the first indication information indicates the first symbol. In the foregoing implementation, a new symbol like the first symbol is defined as a partial OFDM symbol. A transmitting end sends the partial OFDM symbol in time domain, and a receiving end recovers a complete frequency-domain signal based on the partial OFDM symbol. A remaining time-domain part may serve as the reserved resource or the guard period to implement an uplink-downlink transition latency, thereby reducing overheads of the GP and lowering the latency. In an implementation, the first indication information indicates at least one of the following: a starting position of the first interval in the first symbol, duration corresponding to the first interval, a proportion of the duration of the first interval in duration of the first symbol, duration of the second interval in the first symbol, a proportion of the duration of the second interval in the duration of the first symbol, duration of the third interval in the first symbol, or a proportion of the duration of the third interval in the duration of the first symbol. In an implementation, the first symbol is pre-configured as follows: the starting position of the first interval is a starting position of the first symbol, or an ending position of the first interval is an ending position of the first symbol, or the starting position or the ending position of the first interval is a middle position of the first symbol, or the starting position and/or the ending position of the first interval are/is positions/a position other than the starting position and the ending position at the first symbol. In an implementation, the first indication information includes a first index value, and the first index value corresponds to a first position and first duration, where the first position indicates a starting position of the first interval in the first symbol, and the first duration indicates duration of the first interval in the first symbol. Alternatively, the first indication information includes a second index value, and the second index value corresponds to second duration and third duration, where the second durati