Abstract
IEEE 802.16 mesh mode defines routing tree for transmitting data in centralized scheduling but it does not define any explicit proposal for combining uplink and downlink subframes. Deploying combined uplink and downlink subframes on the centralized scheduling scheme can be more flexible and utilization is improved. However, existing interferences among the transmission of neighboring nodes lead to performance reduction of the network. In this paper, an efficient routing tree algorithm is proposed with combined uplink and downlink slot allocation on the centralized scheduling scheme which can abate interferences in the network. This algorithm allows more subscriber stations to transmit concurrently and so improves spatial reuse in the network. Also, the algorithm uses multi-channel and single channel systems and considers relay model, smoothing switching frequently between transmitting and receiving in successive time slots and fairness in the network. Extensive simulation results demonstrate the effectiveness of the proposed method in terms of scheduling length, link concurrency ratio, network throughput and Channel Utilization Ratio (CUR).
Highlights
Wireless mesh network (WMN) is one of the attractive technologies to achieve better services in generation wireless networks
The reason is due to use of same channel at the same time slots which lead to increment the interferences which are sorely affected on simultaneous transmission
We can find that the Channel Utilization Ratio (CUR) is usually below 10% for the number of nodes more than 20 because the nodes which are at the first hop-count from the base station (BS) act as bottlenecks in compare to the nodes with higher number of hop-count which idle in most of the time
Summary
Wireless mesh network (WMN) is one of the attractive technologies to achieve better services in generation wireless networks. Sheu in [8] proposed an interferenceaware routing tree algorithm for the centralized scheduling but did not consider combined uplink and downlink traffic of each node and multi-channel system. An efficient and interference-aware routing tree algorithm is proposed which exploits combined uplink and downlink slot allocation on the centralized scheduling. The proposed method considers interferences, downlink packets, uplink packets and node identifier for determining parent nodes in routing tree construction This algorithm can improve spatial reuse and network throughput. Multi-channel system is used to abate interference from transmission of all neighboring nodes within the mesh network This scheduling algorithm considers fairness among the nodes within the network and moderates switching frequently between transmitting and receiving in successive time slots. Both coordinated and uncoordinated schemes employ mesh distributed scheduling (MSH-DSCH) message to convey resource requests and grants to the neighbors [2]
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