Packet audio playout delay adjustment: performance bounds and algorithms
Multimedia Systems
Scheduling real-time traffic with deadlines over a wireless channel
WOWMOM '99 Proceedings of the 2nd ACM international workshop on Wireless mobile multimedia
Flow and stretch metrics for scheduling continuous job streams
Proceedings of the ninth annual ACM-SIAM symposium on Discrete algorithms
Downlink scheduling in CDMA data networks
MobiCom '00 Proceedings of the 6th annual international conference on Mobile computing and networking
Delay-Sensitive Packet Scheduling for a Wireless Access Link
IEEE Transactions on Mobile Computing
Upper-level scheduling supporting multimedia traffic in cellular data networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
Providing quality of service over a shared wireless link
IEEE Communications Magazine
Opportunistic transmission scheduling with resource-sharing constraints in wireless networks
IEEE Journal on Selected Areas in Communications
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As cellular networks are evolving into high data rate systems, cdma2000 1x EV-DO (HDR) has been highlighted and deployed for data-only wireless service. For wide applications, it is expected to serve some real-time traffic including VoIP. To meet the loss requirement and to ensure the delay bound of VoIP packets, we consider two scheduling algorithms that are channel-aware and flexible in the frame structure; maximal rate (MAX) algorithm and proportionally fair (PF) algorithm. The PF algorithm was known to be appropriate for elastic traffic, not real time traffic. However, through simulations, we find that the PF algorithm with a simple channel test can become a good approach for supporting VoIP users. When the required slot portion of VoIP is 75%, this algorithm obtains the loss rate of about 1% on the average and 3% in the worse case. On the other hand, the MAX algorithm shows twice of the loss rate when the same delay bound and load are given. These results provide an insight in designing a simple admission control scheme for VoIP users to control the average portion of slots occupied by VoIP packets.