27-09-2012, 11:16 AM
A Multichannel Scheduler for High-Speed Wireless Backhaul Links
With Packet Concatenation
A Multichannel Scheduler.doc (Size: 26.5 KB / Downloads: 21)
ABSTRACT
Capacity has been an important issue for many wireless backhaul networks. Both the multihop nature and the large per packet channel access overhead can lead to its low channel efficiency. The problem may get even worse when there are many applications transmitting packets with small data payloads, e.g., Voice over Internet Protocol (VoIP). Previously, the use of multiple parallel channels and employing packet concatenation were treated as separate solutions to these problems. In this paper, we propose a scheduler that concatenates small packets into large frames and sends them through multiple parallel channels with an intelligent channel selection algorithm between neighboring nodes. Based on the delay bound formula, call admission control (CAC) of a broad range of scheduling algorithms can be obtained. It is shown that the proposed packet concatenation and channel selection algorithms greatly outperform the round-robin scheduler in a multihop scenario.
EXISTING SYSTEM
In the Existing system, the multihop nature and the large per packet channel access overhead can lead to its low channel efficiency. The problem may get even worse when there are many applications transmitting packets with small data payloads, e.g., Voice over Internet Protocol (VoIP). The use of multiple parallel channels and employing packet concatenation were treated as separate solutions to these problems.
It has been used to overcome transmission bottlenecks in wired networks when a single large-capacity channel is unavailable or with poor cost-performance ratio. However, there are additional costs for handling the load sharing and packet reordering problems in striping data through parallel channels.
PROPOSED SYSTEM
The main objective of this paper is thus to provide a systematic
approach to develop packet schedulers to take advantage of both these two important schemes so that the backhaul capacity can be greatly increased and the delay constraints
of the real-time traffic can be achieved at the same time. The combination of the proposed packet concatenation and channel selection algorithms can greatly improve the throughput and resequencing delay of both the VoIP and TCP traffic in a multihop scenario. In order to address the QoS requirements, especially the delay constraint, of real-time traffic and the capacity issue of backhaul networks, we thus propose a multichannel scheduler design incorporating packet concatenation mechanism and focus our work on the design of single-node scheduler and its CAC mechanism.