Research Of Heterogeneous Wireless Networks Based On Multi-mode AP

With the rapid development of communication technology, the concept of "wireless city" has already been well known. People's needs for communication technologies are no longer confined to the simple modes such as voice and SMS. Standards for diversity, mobility, high-speed, and high-quality have been the guidelines of the next generation wireless communication systems.The solutions for the mid-range wireless coverage have been almost mature, while the problems for the short range high-speed wireless transmission have not been resolved yet, especially for the cases which need intensive user connections. At present, no single transfer mode can meet the need for any of the following occasions like large recruitment fair, wireless multimedia classroom or wireless conference room. In these circumstances, we require a large number of user connections, stable communication, assured throughput, multimedia data transmission without network congestion and low power consumption.Using collaborative communication technologies with heterogeneous networks, we can transform the mutually exclusive communication mode into seamless connection through joint transmission, processing and scheduling. This paper presents a wireless heterogeneous network mode based on multi-mode AP, which selects the ZigBee technology for the dedicated control channel of the network, the UWB and WIFI for data transmission channels, and performs suitable allocation access control for the cable network business data resources to meet the requirements of no-bottlenecks transmission.Our network system access control algorithm is an improved method based on the exising key technologies of the control layer of ZigBee. Based on the existing network layer routing and application layer binding schemes, a system identification control algorithm with distance perception is proposed, and part of the resources are transmitted using the UWB single-hop mode. At the same time, we add WIFI access congestion control mechanism based on address assignment, which effectively solves the network paralysis and defects resulted from the random conflict and throughput decrement respectively. In the NS2 simulation environment, compared to the single WIFI mode communication, this dynamic configuration terminal interface access control algorithm achieved performance with higher throughput, higher system stability, and lower packet loss rate. Our proposed algorithm not only solves the short range intensive connecting problem, but also it is feasible and easy to implement.