Search

Wireless Regional Area Networks(WRAN), IEEE 802.22 standard, adopts a centralized cellular topology including base station (BS) and customer-premise equipments (CPEs). However this may lead to limited network capacity, since every CPE needs to communicate to the BS and only one channel can be used to communicate in the whole cell per time slot with one BS antenna. Peer to Peer WRAN (P2PWRAN) was proposed [3] to circumvent this, where CPEs can communicate with each other directly. P2PWRAN increases network capacity compared to the standard WRAN because of spatial reuse. Multiple communication channels can be simultaneously allocated and reused in one time slot by the BS and multiple CPEs. In IEEE 802.22b [4], a standard in progress, peer to peer communication plays an important role for enabling smart grids. Channel allocation influences the network performance significantly, therefore, we formulate the spectrum allocation problem in P2PWRAN as a quadratically constrained programming (QCP) problem. It is also proved as a computationally hard problem. The Greedy Coloring Algorithm (GCA) is examined in P2PWRAN channel allocation, and the results show that it may cause severe unfairness in allocation of channels. Thus a Fair Greedy Coloring Algorithm (FGCA) is proposed to guarantee a fair allocation by queuing flows considering previous allocations. However, FGCA guarantees fairness but leads to decrease in performance of P2PWRAN. Therefore, a Trade-off FGCA (TFGCA) is proposed considering fairness and network performance at the same time during allocation. Simulation results show that with the adjustment of two factors in TFGCA, network performance and fairness can be balanced. [ABSTRACT FROM PUBLISHER]

Peer to peer wireless regional area network (P2PWRAN) is proposed as an extension to support peer to peer communication based on IEEE 802.22 [1]. Multiple channel allocation and reuse of channels in the same time slot in P2PWRAN significantly increase the network capacity compared to standard IEEE 802.22 networks. One of the key issues in bringing P2PWRAN into reality is building the interference map. The concept of interference map/mapping has been mentioned in literature however, how to build an interference map is still an open issue. Therefore, we propose a simple and self-adapting interference map building protocol (SIMBP) for P2PWRAN, which can also be used in other multi-channel wireless networks with minor modifications. The simulation results show that SIMBP converges under the P2PWRAN setting, and with number of available channels and growing number of nodes, the capacity of the network is reached eventually. [ABSTRACT FROM PUBLISHER]

IEEE 802.22 mostly considers a typical cellular network with centralized control. Therefore, all intra-cell communications have to be via base stations. It not only leads to extra power consumption for intra-cell communications, but also only one channel can be used per time slot in the whole cell. This may lead to decrease in the network performance. Therefore, we propose a protocol called intra-cell peer to peer communication protocol (ICP2P) based on IEEE 802.22 protocol. The main accomplishments of ICP2P are to support direct intra-cell peer to peer communications between Customer Premises Equipments (CPEs), to allocate multiple channels per time slot in a cell, and to re-allocate same channels in one time slot. The network performance, such as capacity, channel usage and energy consumption, are significantly improved by ICP2P. Additionally, a weighed demand queue algorithm (WDQA) is proposed to guarantee the fairness in channel access opportunities for CPEs. [ABSTRACT FROM PUBLISHER]