Understanding LTE Model Internals and Interfaces

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1581 Understanding LTE Model Internals and InterfacesA Typical Bearer Activation MessageExchange ChartUEeNodeB ASeNodeB S1EPC coreUE receivesESM bearerACTIVEmessageAdmission control:Decision = ADMITRRC Reconfiguration:(RB ID)RRC ReconfigurationAccept: (RB ID)Translator for the AS:(command: Activate,RB ID, QoS profile)Translator for the S1:(command: 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:(command: 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
1581 Understanding LTE Model Internals and InterfacesBearer Activation: UE Initiated CaseUEeNodeB ASeNodeB S1EPC coreUplink trafficarrivesESM bearer resource modification requestBegin the bearer activation process using the same messaging as was usedin the downlink data arrival case as shown on the previous slide• ESM bearer resource modification request• Sent using the signaling bearer on the uplink radio access to the eNodeB• eNodeB forwards to S1, which sends it to the EPC core in the usual GTP tunnel• Does not modify QoS parameters even if rejected• Keeps trying until maximum attempts are exceededCONFIDENTIAL ─ 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.21
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Understanding LTE Model Internals and Interfaces

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