By Magnus Olsson and Catherine Mulligan (Eds.)
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Extra resources for EPC and 4G Packet Networks. Driving the Mobile Broadband Revolution
Architecture Overview 45 The BM-SC is a node controlling the broadcasting sessions and interacting with media sources and the end-user devices (via the PDN GW). The MBMS GW is a logical node responsible for transmitting session data downstream to the base stations over the M1 interface, as well as for invoking the MME in MBMS signaling to control the broadcast sessions. The MBMS GW interfaces the BM-SC for both signaling and data transfer via the SG-mb and SGi-mb interfaces respectively. The MME is connected to the MBMS GW over the Sm interface, and communicates with the LTE RAN over the M3 interface, relaying session control information received from the MBMS GW.
How to best balance FEC and ARQ mechanisms in order to maximize the performance is dependent on the requirements of the service and the characteristics of the actual radio channel, and normally also varies over time. Advanced radio communication systems here deploy adaptive coding, whereby the coding protection varies based on knowledge of the radio channel characteristics. Paging of idle terminals. This allows terminals to save battery power through entering what is called “idle mode”. This means that the network no longer require the terminals to tell the network every time they move from one cell to another cell.
The main thinking is normally to strive for a common service offering over a common core network solution, and a combination of two or three radio access technologies. Different subscription models and data plans then provide a means to differentiate the service offering across the customer base. In the initial phase of LTE rollout, one can assume that the LTE coverage is quite limited in comparison to GSM or WCDMA coverage. The coverage will of course depend on which frequency band is used for LTE deployment.