Browse Prior Art Database

EFFECTIVE COLOR CODE PROCESSING ALLOCATION DURING CIRCUIT DATA CALL (OPEN LOOP)

IP.com Disclosure Number: IPCOM000007779D
Original Publication Date: 1996-Aug-01
Included in the Prior Art Database: 2002-Apr-23
Document File: 2 page(s) / 89K

Publishing Venue

Motorola

Related People

Tim Wilson: AUTHOR [+2]

Abstract

In circuit data, however, there is no assurance that sufficient DTX opportunities will exist. This invention proposes an algorithm to be used in the subscriber that forces the required amount of DTX while minimizing perceived impact on data throughput.

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Technical Developments

EFFECTIVE COLOR CODE PROCESSING ALLOCATION DURING CIRCUIT DATA CALL (OPEN LOOP)

by Tim Wilson and Rod Averbuch

  In circuit data, however, there is no assurance that sufficient DTX opportunities will exist. This invention proposes an algorithm to be used in the subscriber that forces the required amount of DTX while minimizing perceived impact on data throughput.

PROBLEM:

  While on in a 3:l call the iDEN subscriber radio still needs to perform neighbor measurements in order to properly execute handover. This is true whether the call is voice or circuit data.

  The problem is that while on the 3: 1 tralhc chan- nel the subscriber can see the neighbor's color code only if it does not transmit in the inbound slot. If the subscriber transmits into every inbound slot, then it never has a chance to do the required neighbor cell color code check.

  Neighbor color codes do not have to be checked at every neighbor cell measurement, but it is neces- sary to get the color codes once in awhile in order to insure correct handovers. About once a minute, the color codes for all neighbors should be seen at least once. It turns out that the subscriber should not transmit at greater than -85% duty cycle over any l-minute interval.

  For voice, the subscriber will depend on Dis- continuous Transmission @TX) to permit it to check neighbor color codes. Use of DTX means that the subscriber does not transmit inbound unless there is actually speech to send. Voice has a duty cycle of -40% so there will be plenty of DTX opportunities to check the color codes.

  As we stated...