Embedded system architecture for an WLAN-based dual mode mobile phone

Author

Jang, Sung-Bong ; Kim, Young-Gab ; Na, Hong-Seok ; Baik, Doo-Kwon

Author_Institution

Dept. of Comput. Sci. & Eng., Korea Univ., Seoul, South Korea

Volume

55

Issue

3

fYear

2009

fDate

8/1/2009 12:00:00 AM

Firstpage

1623

Lastpage

1630

Abstract

This paper presents new embedded system architecture (ESA) for improving the voice quality in a WLAN/Cellular dual-mode mobile phone. The proposed architecture is based on a dual-core scheme and its main functional blocks are composed of VoIP Remote Procedure Call (VRPC), an audio bridging scheme, and a Server-Assisted Call Management (SACM) algorithm. In order to illustrate the aims of the proposed approach, prototype systems are implemented, and evaluated by measuring average Mean Opinion Score (MOS), and Mouth-To-Ear (M2E) delay. The experimental results show that the proposed approach results in greatly improved voice quality.

Keywords

Internet telephony; cellular radio; embedded systems; mobile handsets; wireless LAN; VoIP remote procedure call; WLAN; audio bridging scheme; average mean opinion score; cellular dual-mode mobile phone; dual mode mobile phone; dual-core scheme; embedded system architecture; mouth-to-ear delay; server-assisted call management algorithm; voice quality; wireless local area network; Codecs; Computer architecture; Costs; Degradation; Delay; Digital signal processing; Embedded system; Mobile handsets; Prototypes; Wireless LAN; Dual-Mode Mobile Phone; FMC; VoIP;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/TCE.2009.5278035

Filename

5278035