Method and apparatus for ultra reliable and low latency communication

1. An operation method of a terminal in a communication system, the operation method comprising:

receiving, from a base station, information on a requirement including information of target block error rates (BLERs) configured to have multi levels, wherein the multi levels of the target BLERs are configured respectively for a plurality of transmit blocks included in a first downlink (DL) packet;

transmitting, to the base station, first information including one or more transmission parameters for achieving the target BLERs and a target throughput included in the information on the requirement, wherein the one or more transmission parameters include at least one of precoder information, modulation and coding scheme (MCS) information, transmission power information, and resource allocation information;

performing a consecutive decoding for the plurality of transmit blocks included in the first DL packet transmitted from the base station; and

transmitting a first feedback signal based on a result of the consecutive decoding in a first feedback resource,

wherein an allocation of resource for the each of the plurality of transmit blocks included in the first DL packet is performed independently for each of the multi levels of the target BLERs, when cyclic redundancy check (CRC) operations for first to n-th transmit blocks among the plurality of transmit blocks are not successful and CRC operation for an (n+1)-th transmit block among the plurality of transmit blocks is successful in the consecutive decoding, the first feedback signal is an acknowledgement (ACK) signal and the first feedback resource is a resource allocated for a feedback operation for the (n+1)-th transmit block, and the n is a natural number.

2. The operation method according to claim 1 , further comprising:

before the receiving the information on the requirement, receiving, from the base station, information of one or more target transmission points targeted for a report of first channel state information (CSI) among one or more transmission points included in the base station;

receiving a first CSI-reference signal (CSI-RS) from the one or more target transmission points;

transmitting the first CSI determined based on the first CSI-RS to the base station;

receiving, from the base station, information on one or more first transmission points which are determined based on the first CSI among the one or more target transmission points; and

receiving a second CSI-RS from the one or more first transmission points indicated by the information on the one or more first transmission points,

wherein the first CSI is a long-term CSI, the first CSI includes information on estimated signal-to-noise ratios (SNRs) for wireless channels from the one or more target transmission points to the terminal and information on interference-to-noise ratios (INRs) for the wireless channels in a second resource, and the second resource is a resource that the one or more target transmission points do not use for transmission.

3. The operation method according to claim 1 , wherein, when the information on the requirement further includes a target throughput.

4. The operation method according to claim 3 , wherein the target throughput is a predetermined size of the first DL packet or a predetermined frequency utilization efficiency of the first DL packet.

5. The operation method according to claim 1 , wherein the performing of the consecutive decoding comprises:

receiving, by the terminal, the first transmit block among the plurality of transmit blocks included in the first DL packet;

performing, by the terminal, decoding on the first transmit block;

when the decoding fails, receiving, by the terminal, a second transmit block among the plurality of transmit blocks included in the first DL packet; and

performing, by the terminal, decoding on the first and second transmit blocks,

wherein a first level of a first target BLER corresponding to the first transmit block is higher than a second level of a second target BLER corresponding to the first transmit block.

6. The operation method according to claim 5 , wherein when all the CRC operations for the plurality of transmit blocks are not successful in the consecutive decoding, the first feedback signal is a negative acknowledgement (NACK) signal and the first feedback resource is a resource allocated for a feedback operation for the m-th transmit block, and the m is a natural number corresponding to a number of the plurality of transmit blocks.

7. The operation method according to claim 1 , wherein the ACK signal is configured to request the base station to stop transmission of the first DL packet.

8. The operation method according to claim 1 , further comprising:

when a plurality of transmit blocks included in a second DL packet transmitted from the base station include one or more orthogonal transmit blocks allocated to orthogonal resources and one or more non-orthogonal transmit blocks allocated to non-orthogonal resources, receiving the one or more orthogonal transmit blocks;

receiving the one or more non-orthogonal transmit blocks; and

performing decoding on the one or more orthogonal transmit blocks and the one or more non-orthogonal transmit blocks.

9. An operation method of a base station, the operation method comprising:

transmitting, to a terminal, information on a requirement including information of target block error rates (BLERs) configured to have multi levels, wherein the multi levels of the target BLERs are configured respectively for a plurality of transmit blocks included in a first downlink (DL) packet;

receiving, from the terminal, first information including one or more transmission parameters for achieving the target BLERs and a target throughput included in the information on the requirement, wherein the one or more transmission parameters include at least one of precoder information, modulation and coding scheme (MCS) information, transmission power information, and resource allocation information;

transmitting the first DL packet to the terminal; and

receiving a first feedback signal transmitted based on a result of a consecutive decoding performed for the plurality of transmit blocks included in the first DL packet by the terminal,

wherein an allocation of resource for the each of the plurality of transmit blocks included in the first DL packet is performed independently for each of the multi levels of the target BLERs, when cyclic redundancy check (CRC) operations for first to n-th transmit blocks among the plurality of transmit blocks are not successful and CRC operation for an (n+1)-th transmit block among the plurality of transmit blocks is successful in the consecutive decoding, the first feedback signal is an ACK signal and the first feedback signal is received in a first feedback resource allocated for a feedback operation for the (n+1)-th transmit block, and the n is a natural number.

10. The operation method according to claim 9 , further comprising:

before the transmitting the information on the requirement, transmitting, to the terminal, information of one or more target transmission points targeted for a report of first channel state information (CSI) among one or more transmission points included in the base station;

transmitting a first CSI-reference signal (CSI-RS) to the terminal through the one or more target transmission points;

receiving the first CSI determined based on the first CSI-RS from the terminal;

transmitting information on one or more first transmission points determined based on the first CSI to the terminal; and

transmitting, to the terminal, a second CSI-RS through the one or more first transmission points indicated by the information on the one or more first transmission points;

wherein the first CSI is a long-term CSI, the first CSI includes information on estimated signal-to-noise ratios (SNRs) for wireless channels from the one or more target transmission points to the terminal and information on interference-to-noise ratios (INRs) for the wireless channels in a second resource, and the second resource is a resource that the one or more target transmission points do not use for transmission.

11. The operation method according to claim 9 , wherein, when the information on the requirement further includes a target throughput.

12. The operation method according to claim 11 , wherein the target throughput is a predetermined size of the first DL packet or a predetermined frequency utilization efficiency of the first DL packet.

13. The operation method according to claim 9 , wherein the transmitting of the first DL packet comprises:

determining one or more transmission parameters used for downlink transmission based on the one or more transmission parameters for achieving the requirements;

transmitting a first transmit block of the first DL packet to the terminal; and

when there is no request to stop transmission of the first DL packet from the terminal, transmitting a second transmit block of the first DL packet to the terminal.

14. The operation method according to claim 13 , wherein when all the CRC operations for the plurality of transmit blocks are not successful in the consecutive decoding, the receiving of the first signal comprises:

receiving the first signal which is a negative acknowledgment (NACK) signal from the terminal in a second feedback resource allocated for a feedback operation for the m-th transmit block; and

retransmitting the first DL packet to the terminal,

wherein the m is a natural number corresponding to a number of the plurality of transmit blocks.

15. The operation method according to claim 9 , further comprising:

when a plurality of transmit blocks included in a second DL packet include one or more orthogonal transmit blocks allocated to orthogonal resources and one or more non-orthogonal transmit blocks allocated to non-orthogonal resources, transmitting the one or more orthogonal transmit blocks to the terminal; and

transmitting the one or more non-orthogonal transmit blocks to the terminal.

16. A terminal in a communication system, the terminal comprising:

a processor; and

a memory storing at least one instruction executable by the processor,

wherein when executed by the processor, the at least one instruction causes the processor to:

receive, from a base station, information on a requirement including information of target block error rates (BLERs) configured to have multi levels, wherein the multi levels of the target BLERs are configured respectively for a plurality of transmit blocks included in a first downlink (DL) packet;

transmit, to the base station, first information including one or more transmission parameters for achieving the target BLERs and a target throughput included in the information on the requirement, wherein the one or more transmission parameters include at least one of precoder information, modulation and coding scheme (MCS) information, transmission power information, and resource allocation information;

perform a consecutive decoding for the plurality of transmit blocks included in the first DL packet transmitted from the base station; and

transmit a first feedback signal based on a result of the consecutive decoding in a first feedback resource,

wherein an allocation of resource for the each of the plurality of transmit blocks included in the first DL packet is performed independently for each of the multi levels of the target BLERs, when cyclic redundancy check (CRC) operations for first to n-th transmit blocks among the plurality of transmit blocks are not successful and CRC operation for an (n+1)-th transmit block among the plurality of transmit blocks is successful in the consecutive decoding, the first feedback signal is an acknowledgement (ACK) signal and the first feedback resource is a resource allocated for a feedback operation for the (n+1)-th transmit block, and the n is a natural number.

17. The terminal according to claim 16 , wherein the information on the requirement further includes a target throughput, and the target throughput is a predetermined size of the first DL packet or a predetermined frequency utilization efficiency of the first DL packet.