NACC

Created: Jan 31, 2020 11:15:18Latest reply: Jan 31, 2020 11:21:45 93 1 0 0
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Hi, team.

I would like to know some information about NACC, anyone can express their views?

Thanks!

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BetterMing
Admin Created Jan 31, 2020 11:21:45 Helpful(0) Helpful(0)

Hello, GuiDance.

NACC is short for Network Assisted Cell Change. In Network Control Mode 0 (NC0)/Network Control Mode 1 (NC1) mode and packet transfer mode, the MS requests the system information (SI) of the target cell from the BSC when performing cell reselection. Then, the BSC sends the requested SI through the Cell Change Notification (CCN) procedure. According to the SI of the target cell, the MS accelerates the packet service access in the target cell. In this way, the period of PS service disruption during a cell reselection is shortened.

NACC is combined with PACKET SI STATUS. The PACKET SI STATUS procedure is initiated if the MS does not obtain the complete SI of the target cell through the NACC procedure. The combination of these two procedures ensures the normal operation of PS services, reducing the service delay or disruption.

An NACC procedure consists of two parts:

l When the cell reselection conditions are fulfilled, the MS requests the BSC to provide the SI of the target cell through a CCN procedure.

l During the cell reselection, the MS accelerates the initial packet access in the target cell according to the SI of the target cell.

The MS can initiate an NACC procedure only when an autonomous cell reselection is triggered. In NC0/NC1 mode and packet transfer mode, any of the following events triggers an NACC procedure:

l The path loss criterion C1 indicates that the path loss of the serving cell is too high. That is, the value of the path loss criterion C1 is smaller than 0. Path loss criterion C1 is used to indicate the amount of path loss in a cell reselection decision.

l A neighboring cell with signal strength greater than that of the serving cell is detected (the C2/C32 criterion for cell reselection must be met). Path loss criterion C2 contains the contents of the C1 criterion plus cell reselection offset and cell reselection penalty. Path loss criterion C32 is the criterion of cell class. It is used in the GPRS cell reselection algorithm. This criterion contains the contents of the C1 criterion plus GPRS cell reselection offset, GPRS cell reselection penalty, and cell priority.

l Downlink signaling reception fails.

l The upper-layer application indicates that the authentication procedure fails.

In the GPRS Mobility Management (GMM) Standby state, the MS initiates autonomous cell reselection regardless of the NC mode but does not initiate an NACC procedure. In Dual Transfer Mode (DTM), the MS does not perform any autonomous cell reselection or network-controlled cell reselection and does not initiate any NACC procedure. Cell reselection is controlled by the CS domain handover procedure on the network side.

NACC is classified into intra-BSC NACC, inter-BSC NACC.

The NACC feature is enabled by setting the parameters NACCSPT and NCO. The NACC procedure is of four types:

l If the serving cell and the target cell are under the same BSC when the MS initiates an NACC procedure, the NACC procedure is an intra-BSC NACC procedure.

l If the serving cell and the target cell are under different BSCs, the NACC procedure is an inter-BSC NACC procedure. 

Thanks.


  • x
  • convention:

All Answers
BetterMing
BetterMing Admin Created Jan 31, 2020 11:21:45 Helpful(0) Helpful(0)

Hello, GuiDance.

NACC is short for Network Assisted Cell Change. In Network Control Mode 0 (NC0)/Network Control Mode 1 (NC1) mode and packet transfer mode, the MS requests the system information (SI) of the target cell from the BSC when performing cell reselection. Then, the BSC sends the requested SI through the Cell Change Notification (CCN) procedure. According to the SI of the target cell, the MS accelerates the packet service access in the target cell. In this way, the period of PS service disruption during a cell reselection is shortened.

NACC is combined with PACKET SI STATUS. The PACKET SI STATUS procedure is initiated if the MS does not obtain the complete SI of the target cell through the NACC procedure. The combination of these two procedures ensures the normal operation of PS services, reducing the service delay or disruption.

An NACC procedure consists of two parts:

l When the cell reselection conditions are fulfilled, the MS requests the BSC to provide the SI of the target cell through a CCN procedure.

l During the cell reselection, the MS accelerates the initial packet access in the target cell according to the SI of the target cell.

The MS can initiate an NACC procedure only when an autonomous cell reselection is triggered. In NC0/NC1 mode and packet transfer mode, any of the following events triggers an NACC procedure:

l The path loss criterion C1 indicates that the path loss of the serving cell is too high. That is, the value of the path loss criterion C1 is smaller than 0. Path loss criterion C1 is used to indicate the amount of path loss in a cell reselection decision.

l A neighboring cell with signal strength greater than that of the serving cell is detected (the C2/C32 criterion for cell reselection must be met). Path loss criterion C2 contains the contents of the C1 criterion plus cell reselection offset and cell reselection penalty. Path loss criterion C32 is the criterion of cell class. It is used in the GPRS cell reselection algorithm. This criterion contains the contents of the C1 criterion plus GPRS cell reselection offset, GPRS cell reselection penalty, and cell priority.

l Downlink signaling reception fails.

l The upper-layer application indicates that the authentication procedure fails.

In the GPRS Mobility Management (GMM) Standby state, the MS initiates autonomous cell reselection regardless of the NC mode but does not initiate an NACC procedure. In Dual Transfer Mode (DTM), the MS does not perform any autonomous cell reselection or network-controlled cell reselection and does not initiate any NACC procedure. Cell reselection is controlled by the CS domain handover procedure on the network side.

NACC is classified into intra-BSC NACC, inter-BSC NACC.

The NACC feature is enabled by setting the parameters NACCSPT and NCO. The NACC procedure is of four types:

l If the serving cell and the target cell are under the same BSC when the MS initiates an NACC procedure, the NACC procedure is an intra-BSC NACC procedure.

l If the serving cell and the target cell are under different BSCs, the NACC procedure is an inter-BSC NACC procedure. 

Thanks.


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