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LTE - Signaling stacks MME

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

Here we would look at signaling entities at MME.

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


..
 MME AL
 UE contexts [IMSI, S1AP IDs, bearer IDs] 


.. Implementation specific
 Towards eNB (S1MME interface) 

..
 ESM
 Control 
 UE1    .  .  .    UEn 
 B1    .  .  .    Bx   B1    .  .  .    By 


.. 24.301, EPS bearer context management
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
..
 EMM
 Control 
 UE1    .  .  .    UEn 


.. 24.301, mobility management like attach/detach, tracking area update, authentication, providing NAS signaling connection, NAS ciphering and integrity protection
..
 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
 Towards SGW (S11 interface) 

..
 GTP-C
 Control 


.. 29.274, signaling plane for GTP tunnel based data plane, one GTP-C TEID per UE, retransmission if reply not received
..
 UDP
 UDP socket 


.. IETF rfc768, one UDP socket for all UEs (?)
..
 IP/L2/L1
 IP transport 


.. IETF rfc791, IP backbone
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

SGW/PGW has GTP-C stack in signaling plane, already covered in this article.

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 eNB « LTE Index » LTE - QoS