Understanding LTE Model Internals and Interfaces
Understanding LTE Model Internals and Interfaces
Understanding LTE Model Internals and Interfaces
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1581 <strong>Underst<strong>and</strong>ing</strong> <strong>LTE</strong> <strong>Model</strong> <strong>Internals</strong> <strong>and</strong> <strong>Interfaces</strong>A Typical Bearer Activation MessageExchange ChartUEeNodeB ASeNodeB S1EPC coreUE receivesESM bearerACTIVEmessageAdmission control:Decision = ADMITRRC Reconfiguration:(RB ID)RRC ReconfigurationAccept: (RB ID)Translator for the AS:(comm<strong>and</strong>: Activate,RB ID, QoS profile)Translator for the S1:(comm<strong>and</strong>: Activate,EPS ID)ESM bearer activationmessage: EPS ID, QoSprofileESM bearer activationACCEPT message:EPS IDDownlink traffic arrivesAdmission controlcan preempt a lowerpriority bearer in theprocessTranslator for the S1:(comm<strong>and</strong>: Release,EPS ID)ESM bearerdeactivationREQUEST message:EPS IDBegin sending downlinktrafficBegin the bearer deactivation process by sending the ESM bearerdeactivation, which will eventually be communicated via RRC messagesto the appropriate UE.The radio side of each GBR EPS bearer goes through admission control. The code isimplemented in lte_admit_control_support.ex.cCONFIDENTIAL ─ RESTRICTED ACCESS: This information may not be disclosed, copied, or transmitted in any format without the prior written consent of OPNET Technologies, Inc. © 2010 OPNET Technologies, Inc.20
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