Incoming Internal Inter-Cell Handover Measurement per Cell

Description

Incoming intra-BSC handover is part of the internal inter-cell handover procedure. It refers to the handover procedure performed in the target cell (the cell where the MS is located after the handover) in the whole internal inter-cell handover procedure. The originating cell (the cell where the MS is located before the handover) and the target cell can be two cells in a BTS or two cells in two BTSs controlled by one BSC.

Figure 1 shows the incoming internal inter-cell handover procedure.

Figure 1 Incoming internal inter-cell handover procedure

A	Measurement point of Incoming Internal Inter-Cell Handover Requests
B	Measurement point of Incoming Internal Inter-Cell Handover Responses
C	Measurement point of Incoming Internal Inter-Cell Handover Detection
D	Measurement point of Successful Incoming Internal Inter-Cell Handovers

After an MS seizes a dedicated channel, it sends measurement reports to the BSC periodically. After receiving the MRs from the MS, the BSC performs handover algorithm based on the traffic load of the serving cell, concentric subcell performance, various signal interference, and the signal quality and transmit/receive level reported in the MR. If the handover algorithm decides to trigger the handover, and the originating cell (serving cell) and the target cell are different cells under the same BSC, the BSC sends a handover trigger indication to initiate an internal inter-cell handover. The procedure of the internal inter-cell handover is as follows:

1. The BSC decides to initiate the handover and selects a target cell according to the handover algorithm based on the MRs reported from the MS.
2. The BSC allocates the suitable channel in the target cell and selects the suitable speech version.
3. The BSC sends a CHAN ACTIV message to the target BTS to activate the channel of the target cell specified by the algorithm.
4. After receiving the CHAN ACTIV ACK message, the BSC requests circuit service resources.
5. After the resources are obtained, the BSC sends an HO CMD message to the MS in the originating cell to notify it of the handover to the specified channel in the target cell.
6. The MS sends an HO ACC message to the BTS of the target cell, notifying it of the access to the new cell.
7. The BTS of the target cell send the HO ACC information in the HO DETECT message to the BSC, and sends a PHY INFO message to the MS.
8. The MS sends a FIRST SABM frame to the BTS of the target cell, sends an EST IND message from that BTS to the BSC, notifying the BSC of the successful access to the target cell. Then the MS sends the HO CMP message to the BSC on the channel in the target cell.
9. The BSC reports an HO PERFORMED message to the MSC. Thus, the internal inter-cell handover is completed.

Measurement Object

Cells.

Measurement Counter

The following table lists the measurement counters related to the Incoming Internal Inter-Cell Handover Measurement per Cell.