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Public Warning System » History » Version 2

laforge, 09/13/2019 08:37 PM
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h1. Public Warning System
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Public Warning System (PWS) refers to a specific feature in LTE/4G networks.  It can be considered as the successor to the [[Cell_Broadcast]] and [[ETWS]] in 2G, or the [[Service_Area_Broadcast]] in 3G.
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h2. Architecture
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h3. Network Diagram
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{{graphviz_link()
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digraph G {
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  BTS0 [label="eNodeB"];
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  BTS1 [label="eNodeB"];
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  BTS10 [label="eNodeB"];
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  BTS11 [label="eNodeB"];
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  BSC [label="MME"];
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  BSC1 [label="MME"];
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  User -> CBC [label="proprietaty"];
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  CBC -> BSC [label="SBc-AP"];
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  CBC -> BSC1 [label="SBc-AP"];
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  BSC -> BTS0 [label="S1-AP"];
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  BSC -> BTS1 [label="S1-AP"];
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  BSC1 -> BTS10 [label="S1-AP"];
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  BSC1 -> BTS11 [label="S1-AP"];
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  BTS0 -> UE [label="SIB10/11/12"];
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}
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}}
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h3. Ladder Diagram
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!osmodevcon2019-cell_broadcast__6.png!
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h2. Interfaces
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h3. SBc interface between CBC and MME
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The interface is based on a ASN.1 based protocol called SBc-AP which is specified in "3GPP TS 29.168":https://www.etsi.org/deliver/etsi_ts/129100_129199/129168/15.01.00_60/ts_129168v150100p.pdf
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The protocol operates over SCTP. Connections are initiated by the CBC to the MME, and the MME listens for SBcAP connections on SCTP port 29168.
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