The basic network structure of CBS is depicted by
Figure 2.
The basic network structure replaces the GSM BSS with the UTRAN containing the RNC and the Node B. The cell broadcast centre (CBC) is part of the core network and connected to a routing node e.g. a 3G SGSN via the Bc reference point. Thus the CBC can reach every RNC via the user plane of the Iu interface. On the logical interface between the CBC and the RNC protocol is described in
TS 25.419. The other UTRAN related interfaces are described in the according UTRAN specifications based on the
3GPP TR 25.925 [21]. Based on this architecture and the current requirements for cell broadcast the core network elements like MSC, VLR, HLR etc are not involved for the service delivery.
The CBE and the interface between CBE and CBC are out of scope of 3GPP specifications.
The basic network structure of PWS architecture in E-UTRAN is depicted by
Figure 3.3-1.
The cell broadcast centre (CBC) is part of the core network and connected to the MME via the SBc reference point. The interface between the CBC and the MME is described in
TS 29.168 and the interface between the MME and the eNodeB is described in
TS 36.413.
The CBE and the interface between CBE and CBC are out of scope of 3GPP specifications.