Understanding LTE Model Internals and Interfaces
Understanding LTE Model Internals and Interfaces
Understanding LTE Model Internals and Interfaces
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
1581 <strong>Underst<strong>and</strong>ing</strong> <strong>LTE</strong> <strong>Model</strong> <strong>Internals</strong> <strong>and</strong> <strong>Interfaces</strong>EPS BearerActivation/Deactivation/Modification• Bearers can be activated, deactivated, <strong>and</strong> modified on-the-fly• Activation:• Activation begins at the higher layer (NAS)• Both the network-initiated <strong>and</strong> UE-initiated cases supported• Deactivation:• Bearer deactivation can begin at the NAS or radio level• In OPNET, bearer deactivation is supported for idle bearers, which starts at theradio level at the eNodeB• Bearers can also be preempted, in which case, they are torn down from thesystem in a similar way as the inactive bearers• Modification:• Modification of the bearer’s QoS parameters is defined at the higher layer in thest<strong>and</strong>ard (NAS)• In OPNET, QoS parameters are not modified at the EPS or radio level, althoughbearer modification message is used when it is rejected at the setup• In lab 1, bearer modification will be achieved at the radio layerCONFIDENTIAL ─ 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.18