TS 123 053-2014

Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Tandem Free Operation (TFO); Service description; Stage 2 (V12.0.0; 3GPP TS 23.053 version 12.0.0 Release 12)


 

 

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标准号
TS 123 053-2014
发布日期
2014年09月01日
实施日期
2016年01月27日
废止日期
中国标准分类号
/
国际标准分类号
/
发布单位
ETSI - European Telecommunications Standards Institute
引用标准
16
适用范围
The present document defines the stage 2 service description for Tandem Free Operation (TFO) in and between GSM and UMTS. Tandem Free Operation applies only to speech calls. NOTE: The TFO principles are built so that they could be used as well by other systems other than GSM and UMTS. In analogy with ITU-T Recommendations I.130 [2] and with reference to ITU-T Recommendations Q.65 VI.1 (Stage 2 of the method for the characterisation of services supported by an ISDN)@ the second stage of the following three-level structure is derived from a stage 1 service description. - Stage 1 is an overall service description@ from the service subscriber's and user's standpoints@ that views the network as a single entity which provides services to the user. - Stage 2 identifies the functional capabilities and information flows needed to support the service described in stage 1. Furthermore@ it identifies various possible physical locations for the functional capabilities. The output of Stage 2@ which is signalling system independent@ is used as an input to Stage 3@ the design of signalling system and switching Recommendations. - Stage 3 defines the signalling system protocols and switching functions needed to implement the service described in stage 2.




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