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DYNAMIC TIME-OUT ALGORITHM FOR TRUNKED MOBILE RADIOS

IP.com Disclosure Number: IPCOM000007164D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2002-Mar-01
Document File: 1 page(s) / 80K

Publishing Venue

Motorola

Related People

Suresh Thadhani: AUTHOR

Abstract

Today on a Motorola Trunked Communications system, there exists a limitation on the amount of OSW traffic a mobile can tolerate while waiting for an update transaction from the CSC. This limita- tion is currently 172 OSW's (4 set). In today's global economic situation with resources becoming scarce, Tiunked Communication systems are getting loaded beyond capacity. This creates a phenomenon ofcon- trol channel flooding; where-during peak hours of usage-there becomes a very high number of mobile updates transmitted over the control channel, thus increasing control channel tragic. This in turn extends the amount of time a mobile has to wait before its update is received. If the mobile doesn't receive an update Within 172 OSW's (4 set), it will time-out and revert to a dormant state. Obviously a way to overcome this issue is to increase the number of OSW's before a radio will time-out. But this only creates another limitation.

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MO-LA Technical Developments Volume 21 February 1994

DYNAMIC TIME-OUT ALGORITHM FOR TRUNKED MOBILE RADIOS

by Suresh Thadhani

Today on a Motorola Trunked Communications

system, there exists a limitation on the amount of OSW traffic a mobile can tolerate while waiting for an update transaction from the CSC. This limita- tion is currently 172 OSW's (4 set). In today's global economic situation with resources becoming scarce, Tiunked Communication systems are getting loaded beyond capacity. This creates a phenomenon ofcon- trol channel flooding; where-during peak hours of usage-there becomes a very high number of mobile updates transmitted over the control channel, thus increasing control channel tragic. This in turn extends the amount of time a mobile has to wait before its update is received. If the mobile doesn't receive an update Within 172 OSW's (4 set), it will time-out and revert to a dormant state. Obviously a way to overcome this issue is to increase the number of OSW's before a radio will time-out. But this only creates another limitation.

  A way to relieve this issue is to make use of the CSC scan markets. A scan marker is just a particu- lar type ofOSW which the CSC transmits.

  The CSC transmits OSW's which it receives horn a queue. This queue (transmit queue) is FIFO in nature. A scan market is placed at the bottom ofthe queue at initialization. This scan marker is eventu- ally transmitted. Aher transmission, the scan marker is queued to the bottom again. This is ongoing; and

guarantees that a scan marker will eventually be transmitted, regardless ofthe number ofOSW's which are placed in the queue for transmission. In a situa- tion where there is no traffic on the system only the scan marker will be transmitted. In a situation of heavy traffic, a scan ma...