Scheduling real-time traffic in IP-based cellular networks

Abstract

Increasing use of real-time applications over IP networks will require better use of available resources to meet the stringent requirements of real-time applications, especially over the wireless links. When performing data linkhetwork layer scheduling, priorities of different realtime packets can be differentiated by exploiting the information available from a higher layer of the protocol stack (RTPRTCP). Utilizing the fast power control feature available in CDMA-based wireless networks, a packet scheduling algorithm'for real-time traffic over an IP-based cellular network was designed and evaluated. By utilizing the channel state and deadline information, much improved performance in transport of real-time traffic was achieved.different QoS schemes. Applications requiring better than best effort service over the Internet have been increasing over the years, and the effort to provide the necessary QoS guarantees has been an active area of research [3] [4]. Providing similar guarantees on bandwidth, end-to-end delay, delay jitter, and packet loss in a wireless network has been more challenging due to unique physical problems of the wireless channel such as limited bandwidth and high bit error rates (BER). Numerous MAC protocols have been proposed to deal with the expected demand for multimedia services over the wireless network [5] [6]. However, in these work the wireless link was studied separately from the rest of the network. The focus of these studies has been on the link-level performance rather than on end-toend performance.

Interference management using basestation coordination in broadband wireless access networks

“…Most of these algorithms are in essence modified versions of some scheduling algorithms employed in wireline networks used to cope with the lower transmission rate and high error rate encountered in wireless environment (see e.g. [1][2][3]). Then, several algorithms have proposed the concept of user diversity by making use of the channel variations and allocate a lot of resources for users with good channel conditions and lower (or even no resources at all) to users with bad channel conditions [4][5][6].…”

Novel rate allocation scheme to minimize average transmission delay in CDMA uplink

“…Several papers in recent literature have been dedicated to discussing transmission delay issues in CDMA networks [5][6][7]. An optimum power and rate allocation rule that minimizes average transmission delay of the simultaneous users experiencing different channel gains under transmission power and required SIR constraints was derived in [5].…”

“…An optimum power and rate allocation rule that minimizes average transmission delay of the simultaneous users experiencing different channel gains under transmission power and required SIR constraints was derived in [5]. Authors in [6] designed a packet scheduling algorithm to guarantee delay performance for real-time traffic. But these schemes are only developed for CDMA downlink and do not consider the multi-service systems.…”