Methods of contention-based transmission

摘要

A method for contention-based (CB) uplink transmission in a wireless communication network is provided. A base station (eNB) first transmits CB configuration information and CB grant to a user equipment (UE). The UE derives a plurality of transmission opportunities from the uplink CB grant and in response transmits uplink CB data via one of the transmission opportunities. The UE then receives an acknowledgment from the serving base station. If the uplink CB data is non-decodable by the eNB due to multiple contention UEs, then the UE retransmits the uplink data in response to a negative acknowledgment. In one novel aspect, the uplink transmission radio resource carriers both the uplink CB data and UE-selected signature information. In one embodiment, the UE-selected signature information is transmitted via pilot tones. By eliminating a separate phase of contention resolution, the overall latency of CB transmission is reduced and transmission efficiency is improved.

主权项

1. A method for contention-based (CB) uplink transmission in a wireless communication network, the method comprising:
receiving, by a user equipment (UE), CB configuration information and an uplink CB grant from a serving base station in the wireless communication network, wherein the uplink CB grant is received before transmitting UE-selected signature information; deriving a plurality of transmission opportunities from the uplink CB grant and in response transmitting uplink CB data via radio resource blocks of an uplink data channel correspond to one of the transmission opportunities, wherein the radio resource blocks carry both the uplink CB data and the UE-selected signature information, wherein the uplink CB data is carried by data tones and the UE-selected signature information is embedded into pilots tones of the same radio resource blocks, and wherein the UE-selected signature information contains a preamble of UE identity information that is mapped into the pilot tones for eliminating a separate preamble transmission; and receiving an acknowledgment from the serving base station.