Dismiss
There will be a system update on Friday, May 5th, 6 PM ET. You may experience a brief service interruption.
Browse Prior Art Database

OVER THE AIR SITE ALIAS FOR PRIVATE TRUNKED SYSTEMS

IP.com Disclosure Number: IPCOM000007924D
Original Publication Date: 1996-Nov-01
Included in the Prior Art Database: 2002-May-06
Document File: 3 page(s) / 148K

Publishing Venue

Motorola

Related People

Matthew Pope: AUTHOR [+3]

Abstract

In existing trunked systems there is a mecha- nism that transmits a site identification number over the air on a site's control channel. Any radio monitoring the control channel at this site will receive this site ID. As implied by the name, the site ID is just a number used to identify a particular site. Many customers prefer to reference the site number with a site alias. A site alias is a textual description ofthe site derived From the site ID. This allows for easier determination of a subscriber user's current site asso- ciation. An example of a site alias might be "CHCAGOI' In today's trunked systems the site alias is not transmitted over the control channel, only the site number. In order to facilitate the usage of site aliases, the user must have the site alias infor- mation preprogrammed in the subscriber unit. The subscriber unit then makes a translation from site number to site alias in order to display this informa- tion to the user.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 48% of the total text.

Page 1 of 3

M-ROLA Technical Developments

OVER THE AIR SITE ALIAS FOR PRIVATE TRUNKED SYSTEMS

by Matthew Pope, Daniel J. McDonald and Rob Biggs

CURRENT TECHNOLOGY

  In existing trunked systems there is a mecha- nism that transmits a site identification number over the air on a site's control channel. Any radio monitoring the control channel at this site will receive this site ID. As implied by the name, the site ID is just a number used to identify a particular site. Many customers prefer to reference the site number with a site alias. A site alias is a textual description ofthe site derived From the site ID. This allows for easier determination of a subscriber user's current site asso- ciation. An example of a site alias might be "CHCAGOI' In today's trunked systems the site alias is not transmitted over the control channel, only the site number. In order to facilitate the usage of site aliases, the user must have the site alias infor- mation preprogrammed in the subscriber unit. The subscriber unit then makes a translation from site number to site alias in order to display this informa- tion to the user.

subscriber unit roams from site to site, a new site alias will be made available to the subscriber on the current sites control channel. Every twelve seconds a new site alias will get transmitted at a site. Hence, the radio will continually be updated with new site aliases. The radio will now be dynamically told what the site alias is for the site it is currently monitoring.

The algorithm for this invention is shown in Diagrams 1 and 2.

RXED END OPERATION

  Diagram 1 describes how a site alias gets trans- mitted. Every three seconds an outbound signalling word (OSW) containing site ID information is trans- mitted on the control channel. This site informa- tion contains site alias information or site number or both. For site alias information, the site alias is decomposed into three distinct portions of the suite alias. This is due to control channel bandwidth con- straints. Using the example in Diagram 1, the first piece of the site alias, "CH" will get transmitted. Three seconds later the next piece of the site alias, "CA" will get transmitted. Three seconds later the last piece of the site alias, "GO" will get transmit- ted. Three seconds later the normal or current site ID will get transmitted Three seconds later the whole cycle will repeat.

  Once a complete cycle of site alias information is received by the subscriber unit, the site alias can be displayed.

  Each site alias is also tagged with a sequence number and an index number. The sequence num- ber is used to determine if the site alias "pieces" are all related to the same site alias. Those site alias pieces with the same sequence number are all part of the same site alias. By utilizing a sequence num- ber, changing/updating of a site alias becomes seamless.

PROBLEM

  The current site alias mechanism has several limi- tations associated with it. Due to the limited amount of memory available...