Communication system and alignment method of transcoder

Details Communication system and alignment method of transcoder Communication system and alignment method of transcoder

2007-02-20

2007-02-20

Tsang, Fan (Department: 2614)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S439000

Reexamination Certificate

active

09935675

ABSTRACT:
When a terminal is moved to an area covered by a different switching node RNC of a radio access network, degradation of speech quality is prevented by returning a transcoder insertion connection to a transcoder-free-operation connection. When the terminal is moved and the switching node RNC of the radio access network is changed, a relocation is performed by inserting the transcoder, re-confirmation of parameter information of a bandwidth-compression coding system is requested for a local side switching node RNC and a remote side switching node RNC and, when the transcoder can be bypassed according to the confirmation, the transcoder is removed to return to the transcoder-free-operation connection mode.

REFERENCES:
patent: 5608779 (1997-03-01), Lev et al.
patent: 5867784 (1999-02-01), Lantto
patent: 6556844 (2003-04-01), Mayer
patent: 2003/0032440 (2003-02-01), Sato et al.
Tdoc N4-oo0476 by Siemens (IDS).
TRFO break—Message Sequence Charts, Tdoc N4-00868, Siemens, Oct. 16, 2000.
Siemens, “Through Connection and Iu User Plane Initialization during TrFO establishment”, TrFO/TFO Workshop #2, Jul. 18, 2000, Helsinki, Finland.
NEC, “SRNS Relocation During the TrFO Connection”, TrFO Workshop, Aug. 28, 2000, Seattle, USA.

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