Making transmission schedules immune to topology changes in multi-hop packet radio networks
IEEE/ACM Transactions on Networking (TON)
Time-spread multiple-access (TSMA) protocols for multihop mobile radio networks
IEEE/ACM Transactions on Networking (TON)
An optimal topology-transparent scheduling method in multihop packet radio networks
IEEE/ACM Transactions on Networking (TON)
Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
Modelling and performance analysis of the distributed scheduler in IEEE 802.16 mesh mode
Proceedings of the 6th ACM international symposium on Mobile ad hoc networking and computing
Propagation measurements and models for wireless communications channels
IEEE Communications Magazine
MPEG-4 and H.263 video traces for network performance evaluation
IEEE Network: The Magazine of Global Internetworking
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This paper studies the use of IEEE 802.16d mesh MAC protocol for multi-hop networking in an indoor domestic environment. The mesh network is expected to support time-sensitive audio-video applications with stringent QoS requirement. In the literature, time-spread multiple access (TSMA) is a promising technology to provide a minimum throughput guarantee in a multi-hop mesh network with dynamic topology. However, existing TSMA schemes require the number of nodes in the entire network and their global maximum node degree, be known a priori to a central controller. The requirement is not practical. In view of this problem, this paper proposes a distributed time-spread multiple access (DTSMA) scheme. The proposed DTSMA has the following main contributions: (a) A method for each node to determine locally its polynomial coefficients without a priori global knowledge of node number and maximum node degree, and (b) A method to distribute to neighbours the locally determined polynomial coefficients, and to resolve collision between two sets of identical polynomial coefficients from two neighbouring nodes. The proposed DTSMA has been evaluated through extensive simulations to confirm that it can indeed preserve the capability of providing a minimum throughput guarantee in the absence of the a priori global knowledge. In benchmark against the de facto distributed coordinated scheduling (DCS) in the original IEEE 802.16d mesh MAC protocol under various domestic wireless channel conditions, DTSMA outperforms in terms of packet delivery ratio and average end-to-end packet delay which are important metrics for time-sensitive audio-video applications. Simulation results also show that DTSMA outperforms TSMA in terms of average end-to-end packet delay and average delay jitter when the severity of propagation impairment is high.