Information sending and receiving method, apparatus, and system

Patent metadata

Field	Value
Publication number	US-12495292-B2
Application number	US-202217986313-A
Country	US
Kind code	B2
Filing date	Nov 14, 2022
Priority date	May 15, 2020
Publication date	Dec 9, 2025
Grant date	Dec 9, 2025

Abstract

A communication method and apparatus to reduce a waiting latency in a retransmission process. A terminal device receives a first PDSCH from a network device. In response to failing to decode data carried on the first PDSCH, the terminal device sends an SRS to the network device on a first time-frequency resource. In response to the network device not receiving feedback information of the first PDSCH, or receiving feedback information of the first PDSCH that is a NACK, the network device retransmits the first PDSCH based on a result of measuring the SRS. After determining that the first PDSCH fails to be decoded, the terminal device directly sends the SRS to the network device by using the first time-frequency resource.

First claim

What is claimed is:

1 . An information sending method, comprising:
sending first information to a network device, wherein the first information indicates that the terminal device is a first-type terminal device, wherein the first-type terminal device is a reduced-capability (REDCAP) terminal device, a capability parameter corresponding to the first-type terminal device including a first capability set, the first capability set including a channel bandwidth supported by the terminal device, a quantity of transmit antennas of the terminal device and a quantity of receive antennas of the terminal device, the channel bandwidth of the terminal device is less than 100 megahertz, and the quantity of transmit antennas of the terminal device is less than 4, the quantity of receive antennas of the terminal device is less than 4, and the first information is carried in a preamble, a message 3, Msg3, or a message A, MsgA; sending second information to the network device, wherein the second information indicates that the capability parameter corresponding to the first-type terminal device further includes at least one of a second capability set, a third capability set, a fourth capability set, a fifth capability set, and the second information is sent in a connected state, wherein the second capability set is used to represent a power saving capability of the terminal device, the third capability set is used to represent a short-latency processing capability of the terminal device; the fourth capability set is used to represent a small data transmission capability of the terminal device, the fifth capability set is used to represent a transmission reliability capability of the terminal device.

2 . The method according to claim 1 , wherein the channel bandwidth of the terminal device is 20 megahertz, MHz, the quantity of transmit antennas of the terminal device is 1 or 2; and the quantity of receive antennas of the terminal device is 1 or 2.

3 . The method according to claim 1 , wherein the second capability set includes a representation of a power saving capability of the terminal device;
the third capability set is used to represent a short-latency processing capability of the terminal device; the fourth capability set is used to represent a small data transmission capability and/or an inactive data transmission capability of the terminal device; the fifth capability set is used to represent a transmission reliability capability of the terminal device.

4 . The method according to claim 1 , wherein the sending the first information includes sending the first information in an initial access phase.

5 . The method according to claim 1 , wherein
the second capability set includes at least one of the following: a maximum quantity of pieces of downlink control information, DCI, with different DCI sizes that is supported by the terminal device, the terminal device supports cross slot scheduling, the terminal device supports reception of a wakeup signal, WUS, the terminal device supports radio resource management, RRM, measurement relaxation of a neighboring cell, the terminal device supports reception of a WUS based on a physical downlink control channel, PDCCH, the terminal device supports reduced-power data transmission in an idle state or an in active state, or the terminal device supports extended discontinuous reception, eDRX; the third capability set include at least one of the following: the terminal device supports mini-slot based uplink data transmission, the terminal device supports mini-slot based downlink data transmission, the terminal device supports grant free uplink data transmission or the terminal device supports grant free downlink data transmission, the terminal device supports downlink semi-persistent scheduling, SPS data transmission, or the terminal device supports a short physical uplink control channel, PUCCH, format 0 or a short PUCCH format 2; the fourth capability set include at least one of the following: the terminal device supports a two-step random access channel, RACH, transmission manner, the terminal device supports a 4-step RACH transmission manner, the terminal device supports an early data transmission, EDT, manner, or the terminal device supports a preconfigured uplink resource, PUR transmission manner; the fifth capability set includes at least one of the following: the terminal device supports a data transmission manner of receiving a plurality of transmission and reception points based on a single physical downlink control channel, PDCCH, the terminal device supports a time domain resource corresponding to the PDCCH to be greater than three orthogonal frequency division multiplexing, OFDM, symbols, the terminal device supports repeated transmission of a physical uplink shared channel, PUSCH or the terminal device supports repeated transmission of a PDSCH, the terminal device supports transmission of a PDCCH with a high aggregation level, AL, or the terminal device supports a modulation coding scheme cell radio network temporary identifier, MCS-C-RNTI, table corresponding to a block error ratio, BLER of 1e-5.

6 . An information receiving method, comprising:
receiving, by a network device, first information from a terminal device, wherein the first information indicates that the terminal device is a first-type terminal device, wherein the first-type terminal device is a reduced-capability (REDCAP) terminal device, a capability parameter corresponding to the first-type terminal device including a first capability set, the first capability set including a channel bandwidth supported by the terminal device and a quantity of transmit antennas of the terminal device and a quantity of receive antennas of the terminal device, the channel bandwidth of the terminal device is less than 100 megahertz, and the quantity of transmit antennas of the terminal device is less than 4, the quantity of receive antennas of the terminal device is less than 4, and the first information is carried in a preamble, a message 3, Msg3, or a message A, MsgA; receiving, by the network device, second information from the terminal device, wherein the second information indicates that the capability parameter corresponding to the first-type terminal device further includes at least one of a second capability set, a third capability set, a fourth capability set, a fifth capability set, and the second information is sent in a connected state, wherein the second capability set is used to represent a power saving capability of the terminal device, the third capability set is used to represent a short-latency processing capability of the terminal device; the fourth capability set is used to represent a small data transmission capability of the terminal device, the fifth capability set is used to represent a transmission reliability capability of the terminal device.

7 . The method according to claim 6 , wherein the channel bandwidth of the terminal device is 20 megahertz (MHz), the quantity of transmit antennas of the terminal device is 1 or 2; and the quantity of receive antennas of the terminal device is 1 or 2.

8 . The method according to claim 6 , wherein the receiving the first information includes receiving the first information in an initial access phase.

9 . The method according to claim 6 , wherein
the second capability set includes at least one of the following: a maximum quantity of pieces of downlink control information, DCI, with different DCI sizes that is supported by the terminal device, the terminal device supports cross slot scheduling, the terminal device supports reception of a wakeup signal, WUS, the terminal device supports radio resource management, RRM, measurement relaxation of a neighboring cell, the terminal device sup

Assignees

• Huawei Tech Co Ltd

Inventors

• Zheng Juan
• Li Chaojun
• Hou Hailong
• Fei Yongqiang

Classifications

• H04W52/0235

  where the received signal is a power saving command · CPC title

• Y02D30/70

  in wireless communication networks · CPC title

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W8/22 Primary

  Processing or transfer of terminal data, e.g. status or physical capabilities · CPC title