Mixed Traffic HSDPA scheduling - Impact on VoIP Capacity

Ericson, M.; Wänstedt, Stefan

doi:10.1109/vetecs.2007.269

Cited by 22 publications

(17 citation statements)

References 4 publications

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“…The result is roughly 210ms additional processing delay when using a real embedded VoIP client. This value differs considerably from the more optimistic processing delay estimations of 50-75ms available in research from [14] [6].…”

Section: Figure 10 Offset Delay Measurement Environmentcontrasting

confidence: 70%

“…In particular, in late 2007, advances such as CS over HSPA [6]. In addition, the estimations used in simulations are in general overly optimistic in regards to, e.g.…”

Section: Future Directionsmentioning

confidence: 99%

“…client processing delay. Kim [14] considers the processing/encoding delay to be 50ms, while Ericson [6] assumes around 75ms. These delay values include the jitter buffer playout delay as well.…”

Section: Future Directionsmentioning

confidence: 99%

“…In these studies, the assumption for the estimations is based on whether the call is towards a landline or a mobile end. Some performance simulations are also available [24][2][14][20][1][9][6]. However, the simulations only provide a delay budget rather than a description of the end user experience.…”

mentioning

confidence: 99%

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Towards High Quality VoIP in 3G Networks - An Empirical Study

Arjona

Westphal²,

Ylä-Jääski³

et al. 2008

2008 Fourth Advanced International Conference on Telecommunications

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Third generation (3G) packet switched WCDMA networks with high-speed downlink packet access (HSPDA) are currently being deployed worldwide to provide wireless broadband connectivity. When introducing HSDPA in 3G networks the end user experience and system capacity with voice over IP applications improve considerably. When later on adding also high-speed packet uplink access (HSUPA), the system capacity and end user experience will improve even further. This paper analyzes with measurements the VoIP quality over current Release 5 HSDPA networks. The results show that even though the introduction of HSDPA significantly reduces the user-to-user voice delay, the performance is satisfactory only for selected devices, the overall end user experience is still significantly worse than with circuit switched solutions and not acceptable. The current limitations with VoIP in HSDPA networks with a too large delay can be improved by using the RLC UNACK mode, potentially decreasing the jitter buffer size and reducing the terminal processing delay. In the longer term, HSUPA and several features in 3GPP Release 7 standards will bring further performance improvements in both user plane latency and system capacity.

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Section: Figure 10 Offset Delay Measurement Environmentcontrasting

confidence: 70%

“…In particular, in late 2007, advances such as CS over HSPA [6]. In addition, the estimations used in simulations are in general overly optimistic in regards to, e.g.…”

Section: Future Directionsmentioning

confidence: 99%

Section: Future Directionsmentioning

confidence: 99%

mentioning

confidence: 99%

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Towards High Quality VoIP in 3G Networks - An Empirical Study

Arjona

Westphal²,

Ylä-Jääski³

et al. 2008

2008 Fourth Advanced International Conference on Telecommunications

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“…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]).…”

Section: Introductionmentioning

confidence: 99%

Coverage planning for optimizing HSDPA performance and controlling R99 soft handover

Chen

Yuan

2011

Telecommun Syst

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Abstract-Coverage planning is an important engineering task in deploying UMTS networks implementing both high speed downlink packet access (HSDPA) and Release 99 (R99) services. Coverage planning amounts to determining the cell coverage pattern by means of setting the common pilot channel (CPICH) power of the cells. A conventional strategy is to uniformly allocate a proportion of the total power to CPICH. In this paper, we develop mathematical modeling and optimization approaches to bring the benefit of power saving enabled by optimizing nonuniform CPICH to enhance HSDPA performance, while preserving a desired degree of soft handover (SHO) for R99. The study focuses on HSDPA performance at cell edges, where data throughput is typically low. An integer linear programming model is developed for the resulting optimization problem. The model admits optimal or near-optimal planning solutions for relatively small networks. Solution algorithms based on local search and repeated local search are developed. These algorithms are able to perform the optimization for large-scale networks time-efficiently. Experimental results for both synthesized networks as well as instances originating from real planning scenarios demonstrate the benefit of our optimization approach.

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