U5L25 Inter BSC Handover

U5L25 Inter BSC handover
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  Lecture-25 Inter-BSC handover Inter-BSC handover In this case BSC1, (old BSC) does not control the better cell which is the target for the handover. This means that the MSC will be part of the link procedure between BSC1 and BSC2 (new BSC). Handover request - BSC1 will use the MSC to send a handover request to BSC2. The MSC will know which BSC controls that cell. Activation of new channel - BSC2 will allocate a TCH in the target cell and then order the BTS to activate it. The chosen HO ref. no. will be part of the activation message. The BTS will acknowledge that the activation has been made. Handover command - After the activation the new BSC commands the MS to change to the new channel. The message is sent on FACCH via the old channel and will contain a full description of the new channel and the HO ref. no. 3. Handover bursts - When the MS has changed to the new channel, it will send handover bursts on the new channel. The information content is the HO ref. no. The bursts are as short as the access bursts. This is because the MS does not know the new Timing Advance (TA) value yet. On the detection of the handover bursts, and check of HO ref. no., the new BTS will send the new TA. 4.   Handover complete - Now the MS is ready to continue the traffic and will send a handover complete message, which will be addressed to the old BSC as a Clear command. 5. Release of old channel - When the old BSC receives the clear command from the MSC, the BSC knows that the handover was successful. The BSC orders the  BTS to release the TCH and the BTS will acknowledge. Fig 5.4 Inter BSC handover

RH Estratégico

Apr 16, 2018
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