一個增進無線網路服務品質之有效的頻道切換機制

Abstract

隨著無線網路的發展越來越迅速，越來越多的使用者透過無線網路使用各種不同的應用服務，而通常使用這些服務都需要品質的保證。然而，現在的無線網路並不能夠有效的提供這樣的保證。因此，我們提出了一個頻道切換機制來增進無線網路的服務品質。 通常使用者會選擇訊號最強的基地台連上無線網路。但基地台的訊號強度不代表它可以提供使用者所需要的服務品質。因此，如果我們需要更好的服務品質，就必須要切換到另一個頻道的基地台，並且嘗試是否有更好的服務品質。然而，如果使用者無法聽到其他基地台的訊號時，他只能自行移動自己的位置去尋找其他的基地台。在不需要移動位置或自己一個個嘗試基地台的情況下，我們提出頻道切換機制來解決這個問題。這個機制可以幫助使用者自己或他人切換到合適的基地台，以便得到服務品質的保證和基地台之間的負載平衡，

As the development of wireless network grows faster and faster, there are more and more users using various kinds of applications and services via the wireless network whereas most of these applications and services require the guarantee of the quality of service (QoS). However, the wireless network currently deployed cannot provide any guarantee of the QoS effectively. Therefore, we propose a channel switch mechanism to improve the QoS on wireless network. In most cases, the users may connect to the network by choosing the access point that has the strongest signal. However, the signal strength does not correspond to the quality of service it could offer to the user. Therefore, if we need better QoS, we must re-associate with other access point and try to discover whether the provided QoS is better. Unfortunately, if there are no other reachable access points, the client must move itself to other places to find other access points. To solve this problem, we propose a channel switching mechanism to avoid unnecessary movements or trial-and-error approach to find access points manually. This mechanism effectively helps the users to switch to the proper access points automatically and achieves the load-balancing among the access points to guarantee the QoS.