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http://dx.doi.org/10.3745/KIPSTC.2009.16C.5.661

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

Woo, Hyun-Je (이화여자대학교 컴퓨터학과)
Kim, Joo-Young (LIG 넥스원)
Lee, Mee-Jeong (이화여자대학교 컴퓨터학과)
Publication Information
The KIPS Transactions:PartC / v.16C, no.5, 2009 , pp. 661-668 More about this Journal
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
Keywords
ErtPS Scheduling algorithm; AMR Speech Codec; 802.16e/m; CQICH;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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