Information feedback method and apparatus

摘要

A CB resource feedback method is disclosed. The method includes: receiving, by a network device, uplink information that is sent by a sending device on a CB resource; when the uplink information is decoded, feeding back, by the network device correct reception of the uplink information to the sending device through a first physical downlink control channel, where the first physical downlink control channel is masked with an identifier of the sending device. Through the technical solutions provided in embodiments of the present invention, the sending device may be enabled to accurately know that the uplink information sent by the sending device is received correctly or is received incorrectly, and the sending device may be enabled to know a receiving status more quickly.

主权项

1. An information feedback method by a network device configured to receive uplink information from a sending device, the method comprising:
receiving, by the network device, uplink information that is sent by a sending device on a contention based (CB) resource; and performing a conditional feedback operation by:
feeding back, by the network device to the sending device, correct reception of the uplink information through a first physical downlink control channel (PDCCH) masked with an identifier of the sending device or through a media access control layer control element (MAC CE) when the uplink information is successfully decoded;feeding back, by the network device to the sending device, incorrect reception of the uplink information, when the uplink information is not successfully decoded and no conflict is detected on the CB resource that bears the uplink information, through a second PDCCH masked with a contention radio network temporary identifier (CB-RNTI), wherein the feeding back incorrect reception of the uplink information constitutes an indication, to the sending device, to retransmit the uplink information to the network device through hybrid automatic repeat request (HARQ) retransmission; andfeeding back, by the network device to the sending device, incorrect reception of the uplink information, when the uplink information is not successfully decoded, through a physical hybrid automatic repeat request indicator channel (PHICH), wherein the feeding back incorrect reception of the uplink information constitutes an indication, to the sending device, to retransmit the uplink information to the network device after waiting a backoff period of time.