Content for TR 23.903 Word version: 18.0.0

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0 Introduction p. 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 Scope p. 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 References p. 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.

[1]

TR 21.905: "Vocabulary for 3GPP Specifications".

[2]

TS 44.018: "Mobile radio interface layer 3 specification, Radio Resource Control Protocol".

[3]

TS 48.008: "Mobile-services Switching Centre - Base Station System (MSC - BSS) interface; layer 3 specification".

[4]

TS 25.331: "Radio Resource Control (RRC) protocol specification".

[5]

TS 22.004: "General on supplementary services".

[6]

TS 45.008: "Radio subsystem link control".