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An incremental scan method Disclosure Number: IPCOM000242376D
Original Publication Date: 2015-Jul-10
Included in the Prior Art Database: 2015-Jul-10
Document File: 3 page(s) / 114K

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Zhao, Kk: INVENTOR [+2]


Landing on trunking CC to receive a full period at scanning start. Maintaining CC messages list in a period locally as base for incremental scan. Receiving delta messages on CC in subsequent period based on local CC message. Updating CC local message according to newly received delta CC messages. Leaving CC if received all delta CC messages. Predicting next delta CC message?s coming time based on current period delta message?s span and last period?s duration. Dynamically adjusting prediction based on actual arrival time of delta message.

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By Zhao Kangkai, Yang Wu, Zhou Yu

Motorola Solutions, Inc.



This paper proposes an incremental scan method on a land mobile radio communication system.

Based on the system design that new call grant update only occupies small front part of every period and the statistics that the number of active calls would not change significantly between two adjacent periods, after receiving a full period of control channel messages, subscriber only needs to receive incremental call grant update in subsequent periods during scanning.

After finishing the scanning the prior period, subscriber predicts the arrival time of next scan mark to receive incremental message in next period.


Currently, the general method of scanning on trunking system is intermittently landing on control channel to receive a full period of control channel messages or a fixed period of time.


This general method is time costing, inefficiency and incurring more late entry calls. And it also blocks the implementation of multi-system scan with a conventional channel as priority.



Subscriber lands on control channel to receive a full period of messages, that is to receive all messages between two scan markers when to scan on a control channel at the first time. Then subscriber stores all the received messages locally.

After storing a full period of messages, subscriber receives incremental messages on control channel in subsequent periods based on local stored control channel messages. Because new grant update messages are always in front of old grant update messages and the number of active calls would not change significantly, comparing received control channel messages against stored control channel messages can determine if subscriber has completely received all the new grant update messages. If grant messages or timed broadcast messages are received during this time, subscriber would not compare them with local list, because grant message happens randomly, timed broadcast happens timely, which is not in fix order compared with other messages.

Then subscriber predicts the arr...