以期限排序排程器及封包串接功能提升智慧電網無線後置網路容量之研究

Abstract

在智慧電網中，許多應用所產生的小封包會降低無線通道的使用效率。另外，許多智慧電網應用之資訊只在封包期限之內有其效用，因此在集中器僅分配到固定頻寬的情況下，智慧電網無線後置網路在不違反節點的封包期限的前提下最多所能容納的節點個數成為一個重要的課題。本研究使用期限排序排程器及封包串接功能並且求得其呼叫允入控制來解決以上兩個智慧電網中的問題。我們也對本研究的設計和可靠標頭壓縮協定進行綜合比較。從解析結果和模擬結果可看出，本文所提出的期限排序排程器及封包串接功能可以大幅提高智慧電網無線後置網路的容量。

Many applications in the smart grid generate packets with small data payloads and may lead to low channel efficiency. In addition, some types of information exchanging from the smart meters to the control center is useful only within the predefined delay constraint. Hence, given that the concentrators are assigned a fixed amount of bandwidth, the maximal number of nodes that the smart grid wireless backhaul can support without violating their delay constraints becomes an important topic. In this study, we proposed to employ a deadline ordered scheduler with packet concatenation and obtained the call admission control (CAC) to resolve these two issues. The performance of this novel design were demonstrated via analytical and simulation results. In addition, Robust Header Compression (ROHC) protocol is adopted as a benchmark to compare the performance with packet concatenation method. It is shown that the proposed scheduler with packet concatenation significantly improves the capacity of the smart grid wireless backhaul.