Understanding LTE Model Internals and Interfaces

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1581 Understanding LTE Model Internals and InterfacesUE NAS• Initiates the attachment procedure to the network (EPC)• Controls activation/deactivation of EPS bearers depending upon trafficactivity• While the EPS bearer is setup, data packets mapped to that bearer are queuedlte_ue_nas.pr.mSends ESM “modifydedicated EPS bearerREQUEST” message to EPCSends ESM “Activatededicated EPS bearerACCEPT” message to EPCSends ESM “Deactivatededicated EPS bearerACCEPT” message to EPCFlushes the buffer of aninactive EPS bearerCONFIDENTIAL ─ 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.12
1581 Understanding LTE Model Internals and InterfacesUE AS• Requests bandwidth for higher layer data• Sends Uplink data in assigned grants• Performs HARQ and RLC retransmissions for Uplink MPDUs in error• Processes Downlink datalte_ue_as.pr.mSteady state – connectedto an eNodeBRequests bandwidth usingPUCCHRequests bandwidth usingRACHCONFIDENTIAL ─ 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.13
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Understanding LTE Model Internals and Interfaces

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