In the millimeter wave band, the beam codebook based analog beamforming is adopted for its trade-off between cost and performance. The beam codebook is a matrix containing a set of beam weight vectors that can be utilized to generate different beams. These beams occupy the same system bandwidth by time division multiplexing. In conventional schemes, the beam codebook is fixed hence the time-frequency resources allocated to the users in these beams can not be flexibly adjusted. However, the user traffic is dynamically varying. When the traffic increases sharply, more resources are expected and when the traffic decreases sharply, the resources can be wasted. Thus the fixed beam codebook can not match the user traffic causing unbalanced resource allocation reducing the system throughput. To overcome this problem, the adaptive beam codebook management algorithm is proposed in this paper. Specifically, the low traffic beams are merged while the high traffic beams are divided into narrower beams with higher beam gain. Then the transmission time slots saved by merging beams can be transferred to the divided beams enabling the users to reuse frequency resources. Simulation results show that the adaptive beam codebook can achieve higher system throughput than the fixed beam codebook.
User Traffic based Adaptive Beam Codebook Management for mm-Wave communication
01.09.2022
1025972 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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