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 meeting 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 parameters 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 services. 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.
Performance of a packetized data transmission in cellular CDMA is analyzed in presence of soft handoff and truncated power control. The combined effects of soft handoff parameters, truncated power control at physical layer and truncated ARQ at data link layer on throughput and delay performance of packet data under a prescribed delay constrain is studied. Truncated power control improves the performance by suspending transmissions of mobiles under deep fade along with soft handoff while further improvement is obtained by retransmission at link layer. A variable packet length scheme is studied where packet size is adjusted under different traffic and soft handoff conditions so as to maintain a prescribed level of packet loss associated with T-ARQ. Interactions between power truncation parameter and soft handoff parameters and their impact on data performance are investigated.
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