Efficient Random Access Channel Transmission Method Using Packet Retransmission According to QoS(Special Section on Multi-dimensional Mobile Information Networks)

概要

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This paper proposes an efficient random access channel (RACH) transmission method that utilizes soft-combined consecutively retransmitted message data packets according to the Quality of Service (QoS) requirements for broadband multicarrier/DS-CDMA (MC/DS-CDMA) in the reverse link. In the proposed scheme, the relative transmission power of a message from that of a successfully detected preamble for non-real time (NRT) type traffic data is significantly reduced by soft-combining several retransmitted message data packets thanks to time diversity since the delay requirement is relaxed. Meanwhile, for real time (RT) type traffic data, the relative transmission power of the message from that of the detected preamble is increased in order to reduce the packet error rate with a limited number of retransmissions. Simulation results elucidate that the total required average received signal energy per bit-to-background noise power spectrum density ratio (E_b/N_0) for error-free transmission with time diversity for NRT type traffic data is reduced by more than 2dB compared to that for conventional RACH without the relative transmission power control for a wide rage of fading maximum Doppler frequencies.
社団法人電子情報通信学会の論文
2003-07-01