Effective Bandwidth Allocation for WiMAX Mesh Network
Hung-Chin Jang, Wei-Ching Lin
The aim of this paper is to reduce the media access delay in a
WiMAX mesh network. We observe that as the number of
subscriber stations (SS) in a neighborhood increases, the
processes of transmission opportunity (TO) competition and 3-
way handshake are easy to fail. This may degrade transmission
efficiency and increase packet transmission delay. Besides, the
minislot allocation defined in the WiMAX mesh mode may
cause many lower priority services reserve earlier minislots
than that of higher priority services like rtPS. This may cause
great negative impact on delay-sensitive traffic. In this paper,
we design a QoS classifier to enqueue packets according to
different QoS service classes, present a dynamic holdoff
exponent mechanism to reduce control subframe delay, and
propose a Neighborhood-Based Minislot Allocation (NBMA)
mechanism to reduce data subframe delay. Simulations show
that the proposed methodology outperforms that of IEEE
802.16 and Baye’s DynExp in delay, jitter and throughput. Full Text
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