Browse Prior Art Database

Improved PS performance during DTM handover

IP.com Disclosure Number: IPCOM000199001D
Original Publication Date: 2010-Aug-21
Included in the Prior Art Database: 2010-Aug-21
Document File: 2 page(s) / 172K

Publishing Venue

Motorola

Related People

Brien, Mike: INVENTOR

Abstract

This idea will create CS and PS domain communication for mobility decisions for DTM. When the CS domain detects the need for a handover, the PS domain will be contacted to indicate a handover is imminent, with an indication of the target cell. The PS domain will then have a time period in which to send information to the mobile. This information would include PNCD to allow the mobile to instantly access the target cell for PS services after the handover. 44.060 defines the "Neighbour Cell System Information Distribution" methodology. 44.060 indicates that the PNCD will be stored by the MS for 30 seconds, and must be followed by a Packet Cell Change Continue or a Packet Cell Change Order. Therefore it may be possible to design the system such that no requirement changes are needed. However it is more likely that the PNCD could be modified for DTM cases, where the PNCD includes the (P)SI messages for the target cell and an indication that a CS handover to that cell is imminent.

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Improved Packet Switched Performance during Dual Transfer Mode Handovers

By Michael P Brien

Motorola, Inc.

Networks

 

ABSTRACT

This idea will create Circuit Switched (CS) and Packet Switched (PS) domain communication for mobility decisions for mobiles operating in Dual Transfer Mode (DTM).

PROBLEM

When a mobile operates in Dual Transfer Mode a simultaneous Circuit Switched and Packet Switched call exists. The decision to handover the mobile from one cell to another is controlled by the Circuit Switched domain and therefore the Packet Switched domain has no knowledge that a handover is about to take place.  This results in an increased delay in the PS data transfer during reselection.

SOLUTION

When the CS domain detects the need for a handover, the PS domain will be contacted to indicate a handover is imminent, with an indication of the target cell. The PS domain can then take actions to minimize the impact of the handover.

OPERATION

     The CS domain will signal to the PS domain when a decision to handover has taken place. The PS domain will then have a time period in which to send information to the mobile. This information would include Packet Neighbour Cell Data (PNCD) to allow the mobile to instantly access the target cell for PS services after the handover. 3GPP 44.060 defines the “Neighbour Cell System Information Distribution” methodology. 3GPP 44.060 indicates that the PNCD will be stored by the MS for 30 seconds, and must be followed by a Packet Cell Change...