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Reply To: SDCCH handover

#53629
Bloody
Guest

May I can explain you properly MKT… Let me try….tell me if m wrong.

As you should know there is 26 Frams of TCH in one multi frame.

|TCH|TCH|TCH|….

in this frame one slot is alloted to SDCCH i suppose that is 12th slot. Now this SDCCH is used to carrly all signalling information during call. Like Measurment, Power Management etc. It also includes HO_COMMAND if required.

|TCH||TCH||TCH||TCH|….|SDCCH|TCH||TCH||TCH|….26

Now if BSC decided to do HO and in this multiframe slot number 14 is going on and now BSC can not wait for such a long period because call may ge dropped and at that time BSC decided to steal TCH and replaced by FACCH and gives HO_COMMAND.

So Both channels are atually used for carring out HO_COMMAND.