CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Korean Patent Applications No. 10-2018-0144903 filed on Nov. 21, 2018, No. 10-2018-0160282 filed on Dec. 12, 2018, No. 10-2019-0045096 filed on Apr. 17, 2019, and No. 10-2019-0141479 filed on Nov. 7, 2019 with the Korean Intellectual Property Office (KIPO), the entire contents of which are hereby incorporated by reference.

BACKGROUND

1. Technical Field

The present disclosure relates generally to a technique for transmitting and receiving a data channel in a communication system, and more specifically, to a method for transmitting and receiving a data channel for a service requiring high reliability and low latency.

2. Related Art

The communication system (hereinafter, a new radio (NR) communication system) using a higher frequency band (e.g., a frequency band of 6 GHz or higher) than a frequency band (e.g., a frequency band lower below 6 GHz) of the long term evolution (LTE) (or, LTE-A) is being considered for processing of soaring wireless data. The NR communication system may support not only a frequency band below 6 GHz but also 6 GHz or higher frequency band, and may support various communication services and scenarios as compared to the LTE communication system. For example, usage scenarios of the NR communication system may include enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), massive machine type communication (mMTC), and the like.

In order to satisfy the URLLC requirements in the NR communication system, the same transport block (TB) may be repeatedly transmitted through a plurality of data channels (e.g., physical downlink shared channel (PDSCH), physical uplink shared channel (PUSCH), and physical sidelink shared channel (PSSCH)). For the repeated transmissions of the same TB, methods are needed for indicating the plurality of data channels.

SUMMARY

Accordingly, exemplary embodiments of the present disclosure provide a method for transmitting and receiving a data channel for a service requiring high reliability and low latency in a communication system.

According to an exemplary embodiment of the present disclosure, an operation method of a terminal in a communication system may comprise receiving, from a base station, resource allocation information of a plurality of physical uplink shared channels (PUSCHs) used for repetitive transmission of a same transport block (TB); identifying a position of each of the plurality of PUSCHs in a time domain based on the resource allocation information; and repeatedly transmitting the same TB to the base station at the position of each of the plurality of PUSCHs.

The resource allocation information may include information indicating a start symbol of each of the plurality of PUSCHs and information indicating a number of symbols constituting each of the plurality of PUSCHs in the time domain.

A start symbol of at least one PUSCH among the plurality of PUSCHs may be indicated by a symbol index or an offset between a previous slot boundary and the start symbol.

The resource allocation information may include information indicating an offset between a slot in which the resource allocation information is transmitted and a slot to which at least one PUSCH among the plurality of PUSCHs is allocated.

The resource allocation information may include information indicating a number of slots in which the plurality of PUSCHs are transmitted.

One PUSCH may be transmitted in one slot when the number of slots is equal to a number of the plurality of PUSCHs, and two or more PUSCHs may be transmitted in at least one slot when the number of slots is less than the number of the plurality of PUSCHs.

The slots in which the plurality of PUSCHs are transmitted may be contiguous in a time domain.

The resource allocation information may be received from the base station through downlink control information (DCI) or radio resource control (RRC) signaling.

The operation method may further comprise receiving resource allocation candidates of the plurality of PUSCHs from the base station through RRC signaling, wherein the resource allocation information indicates one resource allocation candidate among the resource allocation candidates, and the resource allocation information is received through DCI.

According to another exemplary embodiment of the present disclosure, an operation method of a base station in a communication system may comprise generating resource allocation information of a plurality of physical uplink shared channels (PUSCHs) used for repetitive transmission of a same transport block (TB); transmitting the resource allocation information to a terminal; and receiving the same TB from the terminal through the plurality of PUSCHs indicated by the resource allocation information.

The resource allocation information may include information indicating a start symbol of each of the plurality of PUSCHs, information indicating a number of consecutive symbol(s) constituting each of the plurality of PUSCHs in a time domain, information indicating an offset between a slot in which the resource allocation information is transmitted and a slot to which at least one PUSCH among the plurality of PUSCHs is allocated, and information indicating a number of slots through which the plurality of PUSCHs are transmitted.

A start symbol of at least one PUSCH among the plurality of PUSCHs may be indicated by a symbol index or an offset between a previous slot boundary and the start symbol.

One PUSCH may be received in one slot when the number of slots is equal to a number of the plurality of PUSCHs, and two or more PUSCHs may be received in at least one slot when the number of slots is less than the number of the plurality of PUSCHs.

The resource allocation information may be transmitted to the terminal through downlink control information (DCI) or radio resource control (RRC) signaling.

The operation method may further comprise transmitting resource allocation candidates of the plurality of PUSCHs to the terminal through RRC signaling, wherein the resource allocation information indicates one resource allocation candidate among the resource allocation candidates, and the resource allocation information is transmitted through DCI.

According to yet another exemplary embodiment of the present disclosure, a terminal in a communication system may comprise a processor and a memory storing at least one instruction executable by the processor, wherein the at least one instruction may configure the processor to receive, from a base station, resource allocation information of a plurality of physical uplink shared channels (PUSCHs) used for repetitive transmission of a same transport block (TB); identify a position of each of the plurality of PUSCHs in a time domain based on the resource allocation information; and repeatedly transmit the same TB to the base station at the position of each of the plurality of PUSCHs.

The resource allocation information may include information indicating a start symbol of each of the plurality of PUSCHs, information indicating a number of symbols constituting each of the plurality of PUSCHs in the time domain, information indicating an offset between a slot in which the resource allocation information is transmitted and a slot to which at least one PUSCH among the plurality of PUSCHs is allocated, and information indicating a number of slots through which the plurality of PUSCHs are transmitted.

A start symbol of at least one PUSCH among the plurality of PUSCHs may be indicated by a symbol index or an offset between a previous slot boundary and the start symbol.

One PUSCH may be transmitted in one slot when the number of slots is equal to a number of the plurality of PUSCHs, and two or more PUSCHs may be transmitted in at least one slot when the number of slots is less than the number of the plurality of PUSCHs.

The at least one instruction may further configure the processor to receive resource allocation candidates of the plurality of PUSCHs from the base station through RRC signaling, wherein the resource allocation information indicates one resource allocation candidate among the resource allocation candidates, and the resource allocation information is received through DCI.

According to the exemplary embodiments of the present disclosure, each of the base station and the terminal can repeatedly transmit the same transport block (TB) by using a plurality of data channels (e.g., physical downlink shared channel (PDSCH), physical uplink shared channel (PUSCH), physical sidelink shared channel (PSSCH)). To this end, the base station can transmit resource allocation information of the plurality of data channels to the terminal through radio resource control (RRC) signaling and/or downlink control information (DCI). In downlink communication, the terminal can receive the same TB from the base station through the plurality of data channels indicated by the resource allocation information. In uplink communication, the terminal can repeatedly transmit the same TB to the base station through the plurality of data channels indicated by the resource allocation information. Therefore, Ultra Reliable Low Latency Communication (URLLC) requirements can be met, and the performance of the communication system can be improved.

