Voice Broadcast Call » History » Version 2
laforge, 11/20/2022 05:01 PM
| 1 | 1 | laforge | h1. Voice Broadcast Call (VBCS) |
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| 3 | 2 | laforge | Voice Broadcast Calls are part of the [[ASCI]] features introduced primarily for GSM-R. |
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| 5 | They allow the distribution of speech (or other signals which can be transmitted via the speech codec), generated by a service subscriber, into a predefined geographical area to all or a group of service subscribers located in this area. |
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| 7 | VBS is an uni-directional service. |
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| 9 | Voice can originate from any subscriber (with related privileges). |
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| 11 | VBS contains the notion of a _VBS group_. Subscribers are either part of a group or not. Each subscriber can be part of up to 50 groups. Every group is identified by a _Group ID_. Every group is realted to a _Group Call Area_ (a group of cells in). |
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| 13 | Only subscribers that are members of the _Group ID_ which are currently within the _Group Call Area_ will receive the voice information. If they leave the area, they loose the call. |
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| 15 | Normal GSM authentication is only performed for the calling subscriber, but not for the called (receiving) subscribers; those have uni-directional downlink signals only with no return channel. |
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| 17 | Subscribers can activate/deactivate their group membership; that information is stored on the SIM card. |
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| 21 | h2. Specifications |
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| 22 | 1 | laforge | |
| 23 | For more information, see |
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| 24 | * 3GPP TS 42.069 (Stage 1) |
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| 25 | * 3GPP TS 43.069 (Stage 2) |
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| 26 | * 3GPP TS 44.069 (Stage 3; BCC Layer 3 Protocol) |
