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ETSI TS 123 034
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ETSI TS 123 034 Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); High Speed Circuit Switched Data (HSCSD) - Stage 2 (3GPP TS 23.034 version 14.0.0 Release 14)
standard by European Telecommunications Standards Institute, 03/01/2017
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Full Description
ETSI TS 123 034 contains the stage 2 service description for a High Speed Circuit Switched Data (HSCSD) onGSM/GERAN in A/Gb mode and Iu mode. HSCSD utilizes the multislot mechanism, i.e. using multiple trafficchannels (/bearers) for the communication.Additionally, the present document specifies some HSCSD related requirements for multi system mobile stationsoperating in UTRAN Iu mode. In UTRAN Iu mode one bearer can provide all needed data rates, and the multislotmechanism is therefore not needed. However, for inter-system handover to GERAN, certain information has to beprovided by the mobile station during the service negotiation. The UTRAN Iu mode aspects concerning HSCSD aredescribed exclusively in clause 4.2.
In analogy with ITU-T Recommendation I.130 [6] (refer to annex A) and with reference of ITU-T RecommendationQ.65 [7] VI.1 (Stage 2 of the method for characterization of services supported by an ISDN), the second stage of theHSCSD is defined as follows.
Stage 2 identifies the functional capabilities and information flows needed to support the service as described in3GPP TS 22.034 [9]. Furthermore, it identifies various possible physical locations for the functional capabilities. Theoutput of Stage 2, which is signalling system independent, is used as an input to Stage 3, the design of signalling systemand switching Recommendations.