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US 8,265,696 B1Granted
Digital telecommunication system
AssigneeNokia Siemens Networks Oy
InventorMarkku Verkama
Life of this patent
Estimating the term…
Abstract
A digital telecommunications system wherein the telecommunications centers of the calling and called terminal are arranged to perform handshaking concerning the speech codec used by the terminals. Depending on the link between the telecommunications centers, the telecommunications centers are arranged to connect call connections past a transcoder unit or to control the transcoder units to let encoded speech through without speech encoding operations in such a way that speech encoding and decoding are carried out only in the terminals. Handshaking between the telecommunications centers is carried out as outband signalling.
Claims22
A digital telecommunications system comprising:
- (a) a first mobile switching centre configured to enable speech communication between a plurality of terminals, the first mobile switching centre being associated with a calling terminal and including a first transcoder unit;
- (b) a second mobile switching centre configured to enable speech communication between a plurality of terminals, the second mobile switching centre being associated with a called terminal and including a second transcoder unit,
- wherein the first and second transcoder units each include speech codecs, in which each of the speech codecs comprises an encoder unit and a decoder unit,
- wherein the calling and the called terminal each include a respective plurality of supported speech codecs, and
- wherein the calling terminal and the called terminal are each arranged to provide information regarding the availability of said respective plurality of supported speech codecs to their associated mobile switching centre;
- (c) the first mobile switching centre being configured to perform handshaking with the second mobile switching centre, the handshaking including indication of the availability of the respective plurality of supported speech codecs supported by the calling terminal,
- wherein the second mobile switching centre is configured to select a compatible speech codec selected from said respective plurality of available and supported speech codecs of each of the calling and the called terminals to be usable commonly by both the calling and called terminals and convey to the first mobile switching centre information indicating the selected compatible codec, and
- wherein the first mobile switching centre is configured to convey to the calling terminal the selected compatible speech codec and to establish call connections that bypass one or more of the transcoder units or, to control the transcoder units to transmit encoded speech between the called and calling terminals without performing speech encoding operations so that speech is encoded and decoded only in the called and calling terminals.
5 more elements
An apparatus, comprising:
- a mobile switching centre in a digital telecommunication network configured to receive information regarding availability of a plurality of supported speech codecs of a calling terminal, and to connect a transcoder located in a transcoder unit to a call connection when required, wherein the mobile switching centre is configured:
- to perform handshaking with another mobile switching centre associated with a called terminal, the handshaking including indication of the availability of the plurality of speech codecs supported by the calling terminal associated with the mobile switching centre,
- to receive from said another mobile switching centre information indicating a speech codec of the called terminal, wherein the speech codec of the called terminal was determined by the another mobile switching centre to be compatible with one of the available plurality of supported speech codecs, and
- to convey to the calling terminal the received information indicating the speech codec and connect a call connection between the calling and called terminals that bypasses the transcoder unit or to control the transcoder unit to transmit encoded speech without performing speech encoding operations in such a way that speech encoding and decoding are only performed in the calling and called terminals.
1 more element
A method, comprising:
- receiving by a mobile switching centre in a digital telecommunication network information from a calling terminal regarding availability of a plurality of supported speech codecs of the calling terminal;
- performing handshaking by the mobile switching centre with another mobile switching centre associated with a called terminal, the handshaking including indication of the availability of the plurality of speech codecs supported by the calling terminal associated with the mobile switching centre;
- receiving from said another mobile switching centre information indicating a compatible speech codec of the called terminal, wherein the speech codec of the called terminal was determined by the another mobile switching centre to be compatible with one of the available plurality of supported speech codecs,
- conveying by the mobile switching centre to the calling terminal information indicating the selected compatible speech codec;
- and
- connecting by the mobile switching centre a call connection between the calling and called terminals that bypasses a transcoder unit in the mobile switching centre or controls the transcoder unit to transmit encoded speech without performing speech encoding operations in such a way that speech encoding and decoding are only performed in the calling and called terminals.
3 more elements
An apparatus, comprising:
- a mobile switching centre in a digital telecommunication network configured to perform handshaking with another mobile switching centre associated with a calling terminal, the handshaking including indication of availability of a plurality of speech codecs supported by the calling terminal, wherein the mobile switching center is configured:
- to receive at the mobile switching centre from a called terminal information regarding availability of a plurality of supported speech codecs of the called terminal;
- to select by the mobile switching centre a compatible speech codec from said respective plurality of available and supported speech codecs of each of the calling and called terminals to be useable commonly by both the calling and called terminals;
- to convey by the mobile switching centre to the another mobile switching centre the selected compatible speech codec;
- and
- to connect by the mobile switching centre a call connection between the calling and called terminals that bypasses a transcoder unit in the mobile switching centre or controls the transcoder unit to transmit encoded speech without performing speech encoding operations in such a way that speech encoding and decoding are only performed in the calling and called terminals.
3 more elements
A method, comprising:
- performing handshaking by a mobile switching centre in a digital telecommunication network with another mobile switching centre associated with a calling terminal, the handshaking including indication of availability of a plurality of speech codecs supported by the calling terminal;
- receiving at the mobile switching centre from a called terminal information regarding availability of a plurality of supported speech codecs of the called terminal;
- selecting by the mobile switching centre a compatible speech codec from said respective plurality of available and supported speech codecs of each of the calling and called terminals to be useable commonly by both the calling and called terminals;
- conveying by the mobile switching centre to the another mobile switching centre the selected compatible speech codec;
- and
- connecting by the mobile switching centre a call connection between the calling and called terminals that bypasses a transcoder unit in the mobile switching centre or controls the transcoder unit to transmit encoded speech without performing speech encoding operations in such a way that speech encoding and decoding are only performed in the calling and called terminals.
3 more elements
Dependencies are inferred from the claim text.