The CBS service permits a number of unacknowledged general CBS messages to be broadcast to all receivers within a particular region. CBS messages are broadcast to defined geographical areas known as cell broadcast areas. These areas may comprise of one or more cells, or may comprise the entire PLMN. Individual CBS messages will be assigned their own geographical coverage areas by mutual agreement between the information provider and the PLMN operator. CBS messages may originate from a
number of Cell Broadcast Entities (CBEs), which are connected to the Cell Broadcast Centre. CBS messages are then
sent from the CBC to the cells, in accordance with the CBS's coverage requirements.
PWS provides a service that allows the network to distribute warning messages on behalf of public authority. PWS
enables the distribution of ETWS, CMAS (aka WEA), KPAS and EU‑Alert warning messages in GSM, UMTS, E‑UTRAN,