Improved ErtPS Scheduling Algorithm for AMR Speech Codec with CNG Mode in IEEE 802.16e Systems


The KIPS Transactions:PartC, Vol. 16, No. 5, pp. 661-668, Oct. 2009
10.3745/KIPSTC.2009.16.5.661,   PDF Download:

Abstract

The Extended real-time Polling Service (ErtPS) is proposed tosupport QoS of VoIP service with silence suppression which generates variable size data packets in IEEE 802.16e systems. If the silence is suppressed, VoIP should support Comfort Noise Generation (CNG) which generates comfort noise for receiver’s auditory sense to notify the status of connection to the user. CNG mode in silent-period generates a data with lower bit rate at long packet transmission intervals in comparison with talk-spurt. Therefore, if the ErtPS, which is designed to support service flows that generate data packets on a periodic basis, is applied to silent-period, resources of the uplink are used inefficiently. In this paper, we proposed the Improved ErtPS algorithm for efficient resource utilization of the silent-period in VoIP traffic supporting CNG. In the proposed algorithm, the base station allocates bandwidth depending on the status of voice at the appropriate interval by havingthe user inform the changes of voice status. The Improved ErtPS utilizes the Cannel Quality Information Channel (CQICH) which is an uplink subchannel for delivering quality information of channel to the base station on a periodic basis in 802.16e systems. We evaluated the performance of proposed algorithm using OPNET simulator. We validated that proposed algorithm improves the bandwidth utilization of the uplink and packet transmission latency


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Cite this article
[IEEE Style]
H. J. Woo, J. Y. Kim, M. J. Lee, "Improved ErtPS Scheduling Algorithm for AMR Speech Codec with CNG Mode in IEEE 802.16e Systems," The KIPS Transactions:PartC, vol. 16, no. 5, pp. 661-668, 2009. DOI: 10.3745/KIPSTC.2009.16.5.661.

[ACM Style]
Hyun Je Woo, Joo Young Kim, and Mee Jeong Lee. 2009. Improved ErtPS Scheduling Algorithm for AMR Speech Codec with CNG Mode in IEEE 802.16e Systems. The KIPS Transactions:PartC, 16, 5, (2009), 661-668. DOI: 10.3745/KIPSTC.2009.16.5.661.