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another knowledge site

LTE - Signaling stacks eNB

LTE - Signaling stacks eNB [Under LTE]
» E-UTRA and E-UTRAN overall description - 36.300, Rel 8 «
» E-UTRAN access - 23.401, Rel 8 «

Here our focus would on signaling entities at eNode B.

AT interface
Adaptor
ESM
EMM
RRC
PDCP
RLC
MAC
PHY
RRM/Relay
RRC S1AP
PDCP SCTP
RLC IP
MAC L2
PHY L1
MME AL
ESM GTP-C
EMM
S1AP
SCTP   UDP  
IP IP
L2 L2
L1 L1
SGW AL
GTP-C
UDP
IP
L2
L1
Towards PGW
UE SRBs
(RRC SRB0/1/2,
MAC LCID 0/1/2)
eNB S1
(S1AP ID)
MME GTP-C
(IMSI,
EPS bearer ID)
SGW


..
 RRM/Relay
 UE contexts [IMSI, S1AP IDs, bearer IDs, QoS etc.] 


.. 36.300:16, radio bearer control, radio admission control, idle/connected mode mobility/handover, load balancing, inter-RAT RRM
 Towards UE (Uu interface) 

..
 RRC
 Control 
 UE1    .  .  .    UEn 
 SRB0/1/2   SRB0/1/2 


.. 36.331, signaling connection management/configuration, data radio bearer configuration, measurement reporting, configuring AS ciphering and integrity protection, system info broadcast, paging, handover
..
 PDCP
 Control 
 UE1    .  .  .    UEn 
 SRB1/2  .  DRB1..11*   SRB1/2  .  DRB1..11* 


....
 RRC 
To
RLC


....
.. 36.323, integrity protection, ciphering
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
..
 RLC
 Control 
 UE1    .  .  .    UEn 
 SRB0/1/2  .  DRB1..11*   SRB0/1/2  .  DRB1..11* 


.. 36.322, buffering, segmentation, concatenation, reassembly, ARQ
..
 MAC
 Control 
 UE1    .  .  .    UEn 
Logical channels
Transport channels
Logical channels
Transport channels


.. 36.321, channel mapping, multiplexing, channel prioritisation, HARQ, scheduling
..
 PHY
Channel mapping & phy procedures


.. 36.201 modulation, coding, power control, cell search, measurements, CRC insertion and other phy specific procedures
 Towards MME (S1MME interface) 

..
 S1AP
 S1AP control 


.. 36.413, UE context management, ERAB management, NAS transport
..
 SCTP
 SCTP association 


.. IETF rfc3309/rfc4106, signaling transport over IP, one association for all UEs
..
 IP/L2/L1
 IP transport 


.. IETF rfc791, IP backbone
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

* as per RRC TS 36.331, sec 6.4, maxDRB is 11; but as per MAC TS 36.321, section 6.2.1, 11 LCIDs are possible, three of which goes for SRB 0-2, leaving maximum 8 for DRBs !

In next article, we will look at signaling entities at MME.

References: 3G Evolution: HSPA and LTE by Dahlman, Parkvall, Sköld, and Beming, LTE - From Theory to Practice, Edited by Sesia, Toufik, and Baker, and SAE and the Evolved Packet Core: Driving the Mobile Broadband Revolution by Olsson, Sultana, Rommer, Frid, and Mulligan.

Copyright © Samir Amberkar 2010-11§

LTE - Signaling stacks UE « LTE Index » LTE - Signaling stacks MME