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Content for  TR 23.903  Word version:  17.0.0

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0  Introductionp. 4

Many 3GPP operators regard circuit switched video services as a key part of UMTS. However there is a strong desire to have an effective and user friendly method of switching between voice and video services when the user desires and/or when radio conditions change and video mode is no longer available.
Following a study of alternative mechanisms, this Technical Report describes the idle mode redial mechanism which 3GPP based systems can use to enhance switching between voice and video services.

1  Scopep. 5

The present document describes the idle mode redial mechanism which 3GPP based systems can use to enhance switching between circuit switched voice and video services.

2  Referencesp. 5

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
TR 21.905: "Vocabulary for 3GPP Specifications".
TS 44.018: "Mobile radio interface layer 3 specification, Radio Resource Control Protocol".
TS 48.008: "Mobile-services Switching Centre - Base Station System (MSC - BSS) interface; layer 3 specification".
TS 25.331: "Radio Resource Control (RRC) protocol specification".
TS 22.004: "General on supplementary services".
TS 45.008: "Radio subsystem link control".
TS 24.008: "Mobile radio interface Layer 3 specification; Core network protocols; Stage 3".
TS 23.009: "Handover procedures".
TS 32.205: "Telecommunication management; Charging management; Charging data description for the Circuit Switched (CS) domain".
TS 22.082: "Call Forwarding (CF) supplementary services Stage 1".
TS 23.082: "Call Forwarding (CF) supplementary services Stage 2".
TS 23.205: "Bearer-independent CS Core Network".

3  Definitions, symbols and abbreviationsp. 5

3.1  Definitionsp. 5

For the purposes of the present document, the following terms and definitions given in TR 21.905 and the following apply.
A party:
the calling party.
B party:
the called party.

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