LTE NAS,RRC,MAC, PDCP and RLC at Radio Interface

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LTE NAS,RRC,MAC, PDCP and RLC at Radio Interface

Postby beginner » 28 Feb 2016, 21:40

Non-Access-Stratum (NAS) Protocol
in NAS, Specification, LTE The non-access stratum (NAS) is highest stratum of the control plane between UE and MME at the radio interface. Main functions of the protocols that are part of the NAS are the support of mobility of the user equipment (UE) and the support of session management procedures to establish and maintain IP connectivity between the UE and a packet data network gateway (PDN GW).
NAS control protocol performs followings:
EPS bearer management;
Authentication;
ECM-IDLE mobility handling;
Paging origination in ECM-IDLE;
Security control.
Protocol specification
3GPP TS 24.301 - Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3


Radio Resource Control (RRC)
in Specification, RRC, LTE RRC protocol layer exists in UE & eNodeb, It is part of LTE air interface control plane. The main services and functions of the RRC sublayer include:
Broadcast of System Information related to the non-access stratum (NAS);
Broadcast of System Information related to the access stratum (AS);
Paging;
Establishment, maintenance and release of an RRC connection between the UE and E-UTRAN
Security functions including key management;
Establishment, configuration, maintenance and release of point to point Radio Bearers;
Mobility functions
QoS management functions;
UE measurement reporting and control of the reporting;
NAS direct message transfer to/from NAS from/to UE.


in PDCP, Specification, LTE PDCP protocol layer exists in UE & eNodeb, It is part of LTE air interface control and user planes.
The main services and functions of the PDCP sublayer for the user plane include:
Header compression and decompression: ROHC only;
Transfer of user data;
In-sequence delivery of upper layer PDUs at PDCP re-establishment procedure for RLC AM;
Duplicate detection of lower layer SDUs at PDCP re-establishment procedure for RLC AM;
Retransmission of PDCP SDUs at handover for RLC AM;
Ciphering and deciphering;
Timer-based SDU discard in uplink.
The main services and functions of the PDCP for the control plane include:
Ciphering and Integrity Protection;
Transfer of control plane data.
Protocol specification
3GPP TS 36.323 - Evolved Universal Terrestrial Radio Access (E-UTRA); Packet Data Convergence Protocol (PDCP) specification

RLC protocol layer exists in UE & eNodeb, It is part of LTE air interface control and user planes.
The main services and functions of the RLC sublayer include:
Transfer of upper layer PDUs;
Error Correction through ARQ (only for AM data transfer);
Concatenation, segmentation and reassembly of RLC SDUs (only for UM and AM data transfer);
Re-segmentation of RLC data PDUs (only for AM data transfer);
In sequence delivery of upper layer PDUs (only for UM and AM data transfer);
Duplicate detection (only for UM and AM data transfer);
Protocol error detection and recovery;
RLC SDU discard (only for UM and AM data transfer);
RLC re-establishment.
Protocol specification
3GPP TS 36.322 - Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Link Control (RLC) protocol specification


Medium Access Control (MAC)
MAC protocol layer exists in UE & eNodeb, It is part of LTE air interface control and user planes.

The main services and functions of the MAC sublayer include:

Mapping between logical channels and transport channels;
Multiplexing/demultiplexing of MAC SDUs belonging to one or different logical channels into/from transport blocks (TB) delivered to/from the physical layer on transport channels;
scheduling information reporting;
Error correction through HARQ;
Priority handling between logical channels of one UE;
Priority handling between UEs by means of dynamic scheduling;
Transport format selection;
Padding.

Protocol specification

3GPP TS 36.321 - Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access Control (MAC) protocol specification



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