Scheduling Algorithms For Policy Driven QoS Support in HSDPA Networks

Abstract

Abstract-Increasing demand for high data-rate multimedia services has led to the emergence of high-speed data transfer features such as High-Speed Downlink Packet Access (HSDPA) for WCDMA networks. The role of the MAC-hs scheduler is vital in HSDPA in improving overall system performance. Using Opportunistic scheduling to exploit multi-user diversity for efficient transmission of best effort services or considering user fairness constraints has been the main focus of most scheduling algorithms. However the need for strict QoS support for services such as streaming, gaming, and VoIP is growing. Service operators can enforce their own policies in meeting these QoS requirements. In this paper we introduce two QoS-aware policy driven scheduling algorithms. We developed an HSDPA system in OPNET, and implemented our scheduling algorithms along with other well-known algorithms. OPNET simulations show that unlike other schedulers, our Strict and Loose Policy Scheduling (SPS and LPS) algorithms comply with the policy constraints if allowed by radio conditions and cell capacity.

Service differentiation in multi-rate HSDPA systems

“…Several authors have considered QoS and PF in multi-rate systems [6], [12], [13], [19], [20]. Most of the schemes are heuristic algorithms derived from the PF scheduling for a single carrier system.…”

Automated planning of CPICH power allocation for enhancing HSDPA performance at cell edges

“…This relation is formulated in (11). In other words, the first term within the parentheses in (5) is at least P HS ij if sij = 1.…”

“…HSDPA scheduling with code multiplexing has been addressed in [4,7,17]. Performance of scheduling algorithms in supporting VoIP has been analyzed by simulation in [9,11]. Other research topics on HSDPA include capacity estimation and cell-size dimensioning.…”

Coverage planning for optimizing HSDPA performance and controlling R99 soft handover

“…These techniques enable lower link latency and significantly higher data rates in comparison to earlier UMTS releases, making HSDPA a key step in the evolution toward mobile broadband Internet. Research on engineering HSDPA networks ranges from analysis of physicaland link-layer capacity [8,16], resource sharing and admission control strategies [4,21], scheduling policies [6,10,15,18], to performance consideration in network dimensioning and planning [3,20,26,28]. The last topic is becoming increasingly important as the HSDPA service grows rapidly in scale, and it leads to new optimization problems in view of the current literature (e.g., [2,19]).…”