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Feature #4852

Updated by laforge about 1 year ago

In order to support GSM-R ASCI, we'd need VGCS/VBS support. 

 In the BSC, this mostly means the following: 
 * definition of VBS/VGCS areas e.g. via VTY (or simply assume all areas are global in initial implementation) 
 * Abis: generation of RSL NOTIFICATION messages 
 * A interface / BSSMAP 
 ** VGCS/VBS SETUP + VGCS/VBS SETUP ACK + VGCS/VBS SETUP REFUSE messages 
 ** VGCS/VBS ASSIGNMENT REQ  
 ** UPLINK REQUEST, UPLINK RELEASE NOTIFICATION, UPLINK SEIZED COMMAND, UPLINK REQUEST ACK, UPLINK REJECT 
 ** VGCS ADDITIONAL INFORMATION 

 There's quite a bit of state machines and logic required. 
 * VGCS/VBS setup procedure 
 * VCGS/VBBS assignment proceure 
 ** procedures according to TS 48.008 section 3.1.21, 3.1.22 
 * handling of uplink related allocation and release procedures (VGCS) 
 * periodic NCH transmissions 
 * SACCH indications of NCH changes 
 * managing the bsc-colocated osmo-mgw 
 ** allocate a 'broadcast' endpoint with one sender and many recipients 
 ** RTP connections for each BTS 
 ** RTP connection to the MSC 
 ** modifying rcvonly/sendonly/sendrecv according to current talker setate (VGCS) 

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