Jointly Opportunistic Beamforming and Scheduling (JOBS) for Downlink Packet Access
20 June 2004
In this memo we studied the trade-off between the throughput of a downlink packet access system utilizing opportunistic beamforming and its delay statistics. We have used the probability that the inter-packet delay of a mobile exceeds a certain multiple of its mean delay, as a figure of merit to judge the delay performance of the system. We have proposed an algorithm that "learns" the current preferred beam of each mobile, and puts this information to use by giving a certain priority to mobiles waiting longer. The proposed algorithm allows us to improve the throughput of the system and, at the same time, its delay characteristics. It requires additional processing at the base stations, but no additional signaling on the air interface.
