Combined Binary Exponential and Linear Backoff (CBELB) Algorithm for Initial Ranging in WiBro
Anup Thapa, Seokjoo Shin · ICEIC : International Conference on Electronics, Informations and Communications · 2008
In this paper a contention resolution backoff algo-rithm termed Combined Binary Exponential and Linear Backoff (CBELB) algorithm is proposed for initial ranging procedure in IEEE 802.16e based WiBro (Wireless Broadband). In CBELB al-gorithm, for first four initial collision, the colliding SS (Subscriber Station) increases its contention window (CW) size exponentially with the factor of 2, whereas in case of successive collision after fifth, the SS increases the contention window size linearly until the maximum number of retransmission is reached. Numerical results show that CBELB algorithm in the WiBro cell reduces the average access delay for the successful ranging request transmission in comparison with BEB when there is moderate traffic in the network.