Broadband Packet Wireless Access Incorporating High-Speed IP Packet Transmission

This paper proposes broadband packet wireless access employing variable spreading factor-orthogonal frequency and code division multiplexing (VSF-OFCDM) in the forward link and multicarrier(MC)/DS-CDMA in the reverse link for the system beyond IMT-2000. Based on wireless access schemes, we propose major radio air interface parameters in the physical layer to achieve our target maximum throughput beyond 100 Mbps and 20 Mbps in the forward and reverse links, respectively. We present key radio link control technologies such as adaptive radio link parameter control in the physical layer according to the QoS requirement and radio link conditions, random access channel based short and long packet transmission in the reverse link, and a weighted Maximum CIR (carrier-to-interference power ratio) scheduler with the assurance of the minimum throughput for accessing users in the forward link. Furthermore, we apply an incremental redundancy type hybrid automatic repeat request associated with turbo coding. Finally, computer simulation results elucidate that the VSF-OFCDM using the proposed radio link parameters achieves transmission above 100 Mbps with the average packet error rate of 10-2 at the average received signal energy per bit-to-background noise spectrum density ratio of approximately 7.3 dB.