Uplink CDMA systems with diverse QoS guarantees for heterogeneous traffic
Sunghyun Choi, Kang Geun Shin · 1997
Addressed is the uplink access control problems for cellular CDMA systems that service heterogeneous traffic with various types of quality-of-service (QoS) and use Multi-Code CDMA (MC-CDMA) to support variable bit rates. Considering its distinct QoS requirements, class-I real-time traffic (e.g., voice and video) is differentiated from class-II nonreal -time traffic (e.g., data). Connection-oriented transmission is achieved by assigning transmitter-oriented code channels for class-I traffic where each corresponding mobile client needs to pass an admission test. Class-II traffic is transmitted in a best-effort manner using the bandwidth left unused by class-I traffic and a transmission-rate request access scheme: whenever a mobile has class-II messages to transmit, the mobile requests code channels via a receiveroriented transmission-request code channel, then, according to the base station scheduling, the transmission is scheduled and permitted. Addressed are the admission test for clas...