Downlink Dynamic Cell Selection in Wireless Networks with Cell Sleeping: Cross Layer Performance Analysis

In this paper, we consider a coordinated multipoint (CoMP) dynamic cell selection (DCS) scheme in order to improve performances of sleeping cell users. According to this DCS, packets for user equipments (UEs) in a sleeping cell are randomly forwarded to the potential active base stations (BSs) by the packet serving gateway (PSG) and UEs in the sleeping cell dynamically select these active BSs to be served in each time slot. We develop an analytical model using the fork/join (F/J) queuing model that considers the time varying nature of the channels, the channel scheduling mechanism, partial channel quality feedback, bursty packet arrivals and the packet scheduling mechanism. The developed analytical model can be used to measure various packet level performance parameters such as packet loss probability (PLP) and queuing delay while accounting for out-of-order packet delivery. Presented numerical results show that the considered CoMP DCS scheme provides significant performance improvement compared to the traditional fixed cell selection.