Access Control Algorithm for Variable Bit Rate Real Time Services in Wireless Multimedia Networks

This paper proposes an access control algorithm for variable rate real time services in wireless packet networks. The proposed algorithm is characterized by a contention-based reservation request and contention-free polling scheme for the transmission of the dynamic parameters. The design objective of the proposed protocol is to guarantee the real-time constraint for the variable rate real time traffic. The wireless terminal establishes a connection to the base station with a contentionbased scheme. The base station scheduler allocates a minislot, which is used for the wireless terminal to transmit its dynamic parameters, such as the residual lifetime and the number of requesting slots. Based on the received dynamic parameters, the scheduler allocates the uplink slots to the wireless terminal with the most stringent delay requirement. The simulation results showed that the proposed algorithm can reduce the packet loss rate significantly. Keywords—Variable rate service, Access control algorithm, Contention-free polling, Packet loss rate