Variable spreading gain CDMA with adaptive control for true packet switching wireless network

A rapidly growing interest in personal communications and mobile computing has underlined the importance of packetized wireless networks that can support mixed traffic such as voice/data/image/video in an efficient manner. In order to provide for a "true packet switching" capability, the authors propose a scheme based on variable-spreading-gain CDMA with adaptive control. This approach accommodates mixed traffic types and dynamic capacity access. In the paper, the authors outline the architecture of such wireless networks and describe the principle and the objectives of their adaptive multiple access algorithm for the uplink control. This algorithm can be implemented distributedly at the mobile stations by a simple downlink broadcast of the uplink load status. Alternatively, it can be implemented centrally at the base station that broadcasts explicitly the permission to transmit in the form of the transmission probabilities for various types of users.