Public Warning System » History » Version 1
laforge, 09/13/2019 08:35 PM
| 1 | 1 | laforge | h1. Public Warning System |
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| 3 | 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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| 5 | h2. Architecture |
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| 6 | |||
| 7 | h3. Network Diagram |
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| 8 | |||
| 9 | {{graphviz_link() |
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| 10 | digraph G { |
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| 11 | BTS0 [label="eNodeB"]; |
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| 12 | BTS1 [label="eNodeB"]; |
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| 13 | BTS10 [label="eNodeB"]; |
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| 14 | BTS11 [label="eNodeB"]; |
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| 15 | BSC [label="MME"]; |
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| 16 | BSC1 [label="MME"]; |
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| 17 | |||
| 18 | User -> CBC [label="proprietaty"]; |
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| 19 | CBC -> BSC [label="SBc-AP"]; |
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| 20 | CBC -> BSC1 [label="SBc-AP"]; |
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| 21 | BSC -> BTS0 [label="S1-AP"]; |
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| 22 | BSC -> BTS1 [label="S1-AP"]; |
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| 23 | BSC1 -> BTS10 [label="S1-AP"]; |
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| 24 | BSC1 -> BTS11 [label="S1-AP"]; |
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| 25 | BTS0 -> UE [label="SIB10/11/12"]; |
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| 26 | } |
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| 27 | }} |
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| 28 | |||
| 29 | h3. Ladder Diagram |
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| 30 | |||
| 31 | !osmodevcon2019-cell_broadcast__6.png! |
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| 33 | |||
| 34 | h2. Interfaces |
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| 36 | h3. SBc interface between CBC and MME |
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| 38 | 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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| 40 | 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. |
