5 Functional contents
3GPP48.056Base Station Controller - Base Transceiver Station (BSC - BTS) interfaceLayer 2 specificationRelease 17TS
The basic functional content of the layer 2 protocol is:
– transparent layer 2 links and time fill;
– point-to-point dedicated layer 2 links addressing both physical entities and functional entities;
– point-to-multipoint addressed links used for layer 2 management;
– basic functions for TEI assignment and management;
– basic priority functions;
– basic supervision of links when not carrying traffic;
– sequence control;
– transmission error control;
– control of errors not recoverable by retransmission.