LOW LATENCY ARQ/HARQ OPERATING IN CARRIER AGGREGATION FOR BACKHAUL LINK

摘要

Described embodiments reduce ARQ/HARQ latency using carrier aggregation and cross-carrier ARQ/HARQ signaling. In embodiments, a wireless backhaul transmission link uses multiple paired carriers with complementary TDD frame timing. In embodiments, backhaul traffic subframes are protected using FEC and/or CRC encoding and ACK/NACK information is generated based on decoding and computing the FEC and/or CRC information for the subframes. The ACK/NACK information may be transmitted on the paired carrier. In embodiments, cross-carrier ARQ/HARQ signaling may reduce ARQ/HARQ latency to less than two TDD subframes.

主权项

1. A method for wireless backhaul communications in a wireless communications network, the method comprising:
receiving, at a first node of the wireless communications network, a first backhaul subframe over a first time division duplexed carrier of a wireless backhaul communications link between the first node and a second node of the wireless communications network; decoding the first backhaul subframe; generating a first acknowledgement/negative acknowledgement (ACK/NACK) indicator based on the decoded first backhaul subframe; transmitting, from the first node to the second node, the first ACK/NACK indicator over a second time division duplexed carrier of the wireless backhaul communications link; and transmitting, within at least a partially overlapping subframe period corresponding to reception of the first backhaul subframe, a second backhaul subframe over the second carrier to the second node.