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>Admission Control in <strong>LTE</strong>• Starts at the NAS layer of the UE or the core network• A chain of ESM <strong>and</strong> RRC messages needs to be exchanged• Applicable only for the GBR bearers• Non GBR bearers are admitted by default• A brief functional overview• The core communicates EPS ID <strong>and</strong> QoS parameters of the bearer to the eNodeB• eNodeB S1 translates the EPS information to the radio information (EPS_ID RB_ID) for the eNodeB AS• eNodeB AS uses a custom procedure to calculate if this GBR bearer should be admittedby looking at the available radio resources• If the bearer can be admitted, the eNodeB AS exchanges RRC messages with the UEAS• Else the NAS at the core is informed about the rejection of EPS bearer• ESM messages are created for the core to indicate that the radio part of the bearer isactive• Finally, the core network starts sending traffic mapped to this 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.19
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