Abstract
An adaptive data transmission scheme based on variable spreading gain (VSG) is studied in cellular CDMA network in presence of soft handoff (HO). The processing gain is varied according to traffic intensity meet-ing a requirement on data bit error rate (BER). The overall performance improvement due to processing gain adaptation and soft HO is evaluated and compared with a fixed rate system. The influence of soft HO pa-rameters on rate adaptation and throughput and delay performance of data is indicated. Further truncated automatic repeat request (T-ARQ) is used in link layer to improve the performance of delay sensitive ser-vices. The joint impact of VSG based transmission in presence of soft handoff at physical layer and T-ARQ at link layer is evaluated. A variable packet size scheme is also studied to meet a constraint on packet loss.
Highlights
Multimedia services are becoming increasingly important in wireless networks
Performance of packet data is evaluated in presence of soft handoff under adaptive transmission based on variable processing gain and is compared with a fixed rate system
The processing gain is varied according to traffic intensity so as to ensure an upper limit on channel bit error rate (BER)
Summary
Multimedia services are becoming increasingly important in wireless networks. The demand for high rate packet data transmission and quality of services (QoS) in wireless networks is growing at a rapid pace. Soft HO provides a seamless connectivity, reduces “ping-pong” effect as present in hard HO, lowers probability of lost calls and eases power control [5,6] It extends the coverage and increases the reverse link capacity [6,7] by reducing overall interference. In the present paper we consider VSG based data transmission meeting a constraint on upper limit of BER in presence of soft handoff. A simulation study is carried out to evaluate performance of packet data in terms of throughput and delay considering the joint effects of VSG and soft handoff. Joint effects of soft HO and truncated ARQ on throughput and delay performance of a packetized data are evaluated for an imperfect power control CDMA. Effects of soft HO parameters on spreading gain adaptation and data performance in terms of throughput, delay and packet loss associated with truncation are indicated.
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