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RISS 인기검색어
- 검색키워드
- 저자 : Hans-Ju¨rgen Zepernick (검색결과 1 건)
- 무료
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- 유료
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Impact of the Adaptive Packet Coding on Speech Quality in Wireless VoIP
정윤찬,Hans-Ju¨rgen Zepernick,J. William Atwood,Al Ann Ibanez 에스케이텔레콤 (주) 2010 Telecommunications Review Vol.20 No.3
The specific packet loss recovery coding used in a Voice over IP (VoIP) system can have a significant impact on the quality delivered to the receiver. We explore three types of basic packet coding used in managing Quality of Service (QoS). Taking into account the study results of them, we propose the quality packet coding methods which perform robust over wireless and mobile networks having much higher average packet loss rates than wired networks. Then we explore the issue of how to reduce network bandwidth necessary for support of the quality packet coding. In this paper,we propose the adaptive quality coding, which can not only improve the perceptual quality for VoIP services over wireless environments but also utilize a small amount of additional bandwidth. We claim that the adaptive operation of the quality packet encoding at the network layer in the sending host does not significantly increase the network throughput comparing with the nonadaptive operation of that. This idea is considered to be important because the efficient use of network bandwidth is essential for support of ever-growing demand in VoIP applications.
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