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    10 <!DOCTYPE concept

    11   PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

    12 <concept id="GUID-0E0D4E95-470F-54BE-8DCB-719976C8B84C" xml:lang="en"><title>What

    13 is Contention Management?</title><shortdesc>This topic describes contention management and the contention management

    14 process flow. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

    15 <p>When a contention issue arises the Access Point priorities of the incoming

    16 connection and the existing connections are compared. If the incoming Access

    17 Point has a higher priority than an existing Access Point the existing Access

    18 Point connection is stopped and the new Access Point connection is started.

    19 If the incoming Access Point priority is lower than or equal to an existing

    20 Access Point connection the incoming Access Point is ignored. </p>

    21 <section><title>Contention Management Process Flow</title> <p>This section

    22 outlines the contention management process flow and the associate components. </p> <p>The

    23 following diagram describes the Contention Management Process Flow. </p><p>The following steps describe what happens when a PDP context contention issue

    24 occurs in the system: </p> <ol>

    25 <li id="GUID-F614DD0D-491E-4E4A-B255-90A50B0CAB8E"><p>The PDP Meta-Connection Provider (MCPR) of the starting connection

    26 calls the <codeph>HandleContentionL</codeph> function of the PDP Tier Manager.</p></li>

    27 <li id="GUID-E77116E5-E364-47CF-9878-502DD869804A"><p>The PDP Tier Manager has an <codeph>iPDPContentionManagement</codeph> instance

    28 of the <codeph>CPDPContentionManagement</codeph> class. The contention request

    29 is added to <codeph>iPDPContentionManagement</codeph>. </p></li>

    30 <li id="GUID-8DAF207F-3320-4DF4-A69E-9824DA800D12"><p>The ContentionManager starts processing the asynchronous contention

    31 request. The priorities assigned to all active connections in the system are

    32 extracted from the MCPR Access Points. The ContentionManager delivers the

    33 extracted priorities to the Contention Management Activity. </p></li>

    34 <li id="GUID-D1DD47FC-F6EA-4F00-A684-FE67DC02AE26"><p>The existing connection priorities are compared with the new connection

    35 priority and one of the following occurs:</p></li>

    36 <li id="GUID-0254D697-B9B0-4D24-8262-BB94C3294016"><p>If the priority of the new connection is lower than those of the existing

    37 connection, the new connection is not permitted.</p></li>

    38 <li id="GUID-D1A41F47-9CFA-4755-BA82-DC05E6F100A7"><p>If the priority of the new connection is higher than one of the existing

    39 connections, the lowest priority connection is stopped and the new connection

    40 is permitted and started.</p></li>

    41 <li id="GUID-E4E8C34B-5305-46B3-AB17-F1CEB6BC741F"><p>Each connection relates to a single application on the mobile device.

    42 One of the following occurs when the connection and application is terminated: </p></li>

    43 <li id="GUID-54B99BA1-16C3-45FC-8400-C37F354B651A"><p>If the application that uses the stopped connection is contention-aware

    44 it calls <codeph>RConnection::Start()</codeph> with the <codeph>TConnAutStartPref</codeph> parameter.

    45 The application starts when the contention is finished.</p></li>

    46 <li id="GUID-BD9CF0F3-D080-42AE-BA18-537E8DA9AD35"><p>If the application that uses the stopped connection is not contention-aware

    47 a disconnection notification is sent to the user without an error message

    48 stating why the connection stopped. </p></li>

    49 </ol></section>

    50 </conbody><related-links>

    51 <link href="GUID-CD57B3EB-B8FD-53CE-B319-FB6275BE391E.dita"><linktext>What is Contention?</linktext>

    52 </link>

    53 <link href="GUID-FF81C5C5-09B7-5194-928E-0BA87417B2CD.dita"><linktext>What are

    54 Access Point                 Priorities?</linktext></link>

    55 </related-links></concept>