Browse Prior Art Database

THE CACHED PAGING FEATURE IN ANALOG AND DIGITAL CELLULAR NETWORKS

IP.com Disclosure Number: IPCOM000008028D
Original Publication Date: 1997-Mar-01
Included in the Prior Art Database: 2002-May-13
Document File: 3 page(s) / 152K

Publishing Venue

Motorola

Related People

Ariel Pashtan: AUTHOR [+3]

Abstract

The technical field is mobility management and call processing procedures for cellular telephony networks.

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MOTOROLA Technical Developments

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THE CACHED PAGING FEATURE IN ANALOG AND DIGITAL CELLULAR NETWORKS

by Ariel Pashtan, Israel A. Cimet and Rod Averbuch

TECHNICAL FIELD

  The technical field is mobility management and call processing procedures for cellular telephony networks.

WHAT PROBLEM WERE YOU TRYING TO SOLVE?

  RF is a scarce resource for radio communica- tion, and new methods to improve the efftciency of its use are constantly sought. In this paper, a new paging procedure (the Cached Paging algorithm) for mobiles in both analog (e.g., AMPS) and digital
(e.g., iDEN, GSM, and USDC) cellular networks is proposed. The Cached Paging algorithm significant- ly improves the efftciency of RF use for paging in high trafftc areas, such as highways, and railroads.

HOW HAVE OTHERS TRIED TO SOLVE THIS PROBLEM IN THE PAST?

  Cell sites are grouped in what are termed loca- tion areas. When a mobile enters a new location area, it performs a location update procedure, i.e.

Depict your solution using at least one drawing

informs the switch infrastructure of its new loca- tion. When a call attempt is directed to the mobile which has registered in a location area, rather than paging all cells in the network, only the cells in the current location area will be paged.

HOW HAS THE PRIOR SOLUTION FAILED TO COMPLETELY SOLVE THIS PROBLEM?

  When a mobile is paged, all cells in the relevant location area will be paged although the mobile is just in one cell. In other words, significant RF band- width is wasted. Decreasing the location area sizes will not improve the problem, since now the mobile has to register more often thus incurring both an RF utilization increase as well as an additional over- head on the signaling required in the infrastructure.

DESCRIBE YOUR SOLUTION

  For 'highway' location areas (the cells are laid along the highway path), the mobile is paged only in 2 cells, rather than in all the location area's cells.

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m MOTOROLA Technical Developments

  The figure above shows a mobile's path through a 'highway' location area comprised of ellipse- shaped cells. The mobile entered the location area in 'cell 4', and traversed 'cell 5' and 'cell 6' in its path across the location area. When in 'cell 6', a call attempt is made to the mobile. The BSC which controls the location area pages the mobile in just 'cell 2' and 'cell 6' rather than paging the mobile in all cells (1-7). Note that 'cell 2' is also paged since the BSC does not know in which direction the mobile is traveling.

cell location are recorded in the BSC. This informa- tion is updated if the mobile originates a call, responds to a page, or performs a periodic update.

  Mobile deregistration is performed in the BSC: upon expiration of an interval timer, all records which were not updated in the last interval are erased. The interval is equal to the l...