| Descripción: |
Voice over Internet Protocol (VoIP) over Wireless Local Area Networks (WLAN) might be a leading application in collaboration with 3rd Generation (3G) mobile network. VoIP is moving on WLAN based on IEEE 802.11 standards. For audio speech quality in packet switch applications, the main concerns are end to end delay and packet loss. Currently, many of packet scheduling algorithms like Weighted Fair Queuing (WFQ), Start-Time Fair Queuing (SFQ) were manly designed to provide the bandwidth reservation. Low Latency Queuing (LLQ) address this problem but undergo from low priority traffic starvation problem. The Strict Priority (SP) is low-cost to maintain the delay sensitive voice traffic. Also, a number of research scheduling solution have been proposed like Class Based Queuing (CBQ), General processor sharing (GPS), Fair Queuing (FQ), Deficit Round Robin (DDR), Nested Deficit Round Robin (NDRR), Dynamic Deficit Round Robin (DDRR), Low Latency Efficient Packet Scheduling (LLEPS), Efficient Scheduler (ES) for the IP-based network. Unfortunately, they have some drawback for real time application. The objective of this research paper, to improve VoIP traffic over WLAN. We propose a novel Voice Priority Queue (VPQ) packet scheduling algorithm to ensure low latency and efficient packet scheduling for VoIP performance of queues and traffics. Experimental topology using on NS-2 network simulator were analyzed for voice traffic. Preliminary results show that this can achieve maximum and more accurate VoIP quality. |
