39018631 LTE Overview

LTE Overview

Topics What is LTE?

Why LTE is needed?

Reference Architecture

E-UTRAN Architecture

EPC Components, Functions and Interfaces MME SGW PDN-GW

Support Information Acronyms Standards References

LTE, EPS, E-UTRAN and EPC

3GPP LTE (Long Term Evolution), an evolution of GSM/UMTS, specifies the next generation 3GPP mobile broadband network

The mobile broadband network is called Evolved Packet System (EPS)

The EPS consists of Evolved UTRAN (E-UTRAN) and Evolved Packet Core (EPC)

For 3GPP high level requirements on UTRA-UTRAN Long Term Evolution (LTE) and 3GPP System Architecture Evolution (SAE), read http://www.3gpp.org/Highlights/LTE/lte.htm

Phase 4 Chalk talks, EPC FDD links: http://mobility.ih.lucent.com/~jlic/lte.htm EPC FDD 7090: http://mobility.ih.lucent.com/~slaha/LTE/

MME sites: https://sps.ndc.lucent.com/sites/wireless.mme/default.aspx - App Arch https://sps.ndc.lucent.com/sites/wireless.mme_sae/default.aspx - SAE

http://www.3gpp.org/Highlights/LTE/lte.htm

http://mobility.ih.lucent.com/~jlic/lte.htm

http://mobility.ih.lucent.com/~slaha/LTE/

https://sps.ndc.lucent.com/sites/wireless.mme/default.aspx

https://sps.ndc.lucent.com/sites/wireless.mme_sae/default.aspx

Mobile Evolution and 3GPP Releases

IP/EthernetRAN

Transport TDM

CDMACDMA

Voice, SMS Web Browsing

Media Streaming VoIP

Real-TimeMultimedia

ServicesServices

IP is the foundation for new multimedia services and multiservice transport

Higher access bandwidth, new spectrum available

New subscriber apps

Lower cost per Mbit transport

Shift towards All-IP and flat/mesh topologies

Higher access bandwidth, new spectrum available

New subscriber apps

Lower cost per Mbit transport

Shift towards All-IP and flat/mesh topologies

ATM, FR, HDLC

What Does LTE Mean to End Users & Service Providers?

Performance Improvement Impact to End User Impact to Service Provider

INCREASED SPECTRAL

EFFICIENCYUplink: 2.00-2.25x vs. 3GDownlink: 1.25x vs. 3G

Lower costs – flat fee pricing

Can buy the same amount of spectrum and pump more data to users, or less spectrum to maintain the same level of data usage

Reduced cost per bit

FASTER SPEEDSUplink: 2.00-2.25x vs. 3G

Downlink: 3x vs. 3GPeak rate = 100 Mbps

Faster downloads of multi-media

Better experience with blended services

More ways to splice bandwidth: Same # of users with more bandwidth/user or more users with same bandwidth per user

INCREASED VOICE CAPACITY

10 MHz: 2x vs. 3G

Better voice quality Support more voice users

REDUCED LATENCY< 50 ms

Faster reactions when gaming

Better voice, video telephony

Can reuse applications across wireless and wireline

More capacity for VoIP and TCP-based applications

Comparisons based on average aggregate performance

3GPP Requirements For LTE Spectrum efficiency

DL : 3-4 times HSDPA for MIMO(2,2) UL : 2-3 times E-DCH for MIMO(1,2)

Frequency Spectrum : Scalable bandwidth : 1.4, 3, 5, 10, 15, 20MHz To cover all frequencies of IMT-2000: 450 MHz to 2.6 GHz

Peak data rate (scaling linearly with the spectrum allocation) DL : > 100Mb/s for 20MHz spectrum allocation UL : > 50Mb/s for 20MHz spectrum allocation

Capacity 200 users for 5MHz, 400 users in larger spectrum allocations

(active state) Latency

C-plane : < 100ms to establish U-plane U-plane : < 10ms from UE to server

Coverage Performance targets up to 5km, slight degradation up to 30km

Mobility LTE is optimized for low speeds 0-15km/h but connection maintained for speeds up to 350 or 500km/h Handover between 3G & 3G LTE

Real-time < 300ms Non-real-time < 500ms

LTE Key Technologies

OFDMA (DL) / SC-FDMA (UL) : Robust modulation in dense environments

Increased spectral efficiency

Simplified Rx design cheaper UE

Scalable - go beyond 5 MHz limitation

MIMO: Increased link capacity Multiple-input, multiple-output UL& DL

Collaborative MIMO (UL)

Overcome multi-path interference

IP Core: flat, scalable Short TTI: 1 ms (2 ms for HSPA)

Backhaul based on IP / MPLS transport

Fits with IMS, VoIP, SIP

High availabilityIP Backbone

S/P GW

eNode B

MediaGateways

CallServers

MME

LTE End to End Architecture

Network simplification User Plane : 3 functional entities : eNode B, Serving Gateway and

PDN Gateway (the gateways can be combined into a single physical entity)

GGSN S/P-GW

Control plane : SGSN MME (Mobility Management Entity)

RNC eNode B

eNode B

LTE S/P GW

IP transportbackbone

Multi-standard User Database

Applicationservers

Service IP backbone

MDS

S1

X2

eNode B

GGSN

SGSN

RNC

NodeB

C-plane U-plane

eNode B

EPC - Network Simplification

C-plane U-plane

S-GW

P-GW

MME

E-UTRAN EPC

MME

9 | Technical Sales Forum | May 2008

LTE Transforms Wireless Access and Core Networks to All-IP

9 |

LTE Network Architecture (Non Roaming Case)

SGi

S4

S3 S1-MME

PCRF S7

S6a

HSS

Operator ’ s IP Services (e.g. IMS, PSS etc.)

Rx+ S10

UE

GERAN

UTRAN SGSN

“ LTE - Uu ” EUTRAN

MME

S11

S5 Serving Gateway

PDN Gateway

S1-U

LTE Network Architecture (Roaming Case Home Routed Traffic)

S6a

HSS

S8

S3

S1 - MME

S10

UTRAN

GERAN

SGSN

MME

S11

Serving Gateway UE

“ LTE

- Uu ”

E - UTRAN

S12

HPLMN

VPLMN

PCRF

Gx Rx

SGi Operator’s IP

Services (e.g. IMS, PSS etc.)

PDN Gateway

S 1 - U

S4

DO-LTE Reference Architecture – Another look

Source: TSG-X.P0057 All interfaces are IP-based

HRPDeRNC

LegacyPDSN

HSGW*

H-PDNGW

eBTS

MIPv4 (MIPv6)

A10/A11 A10/A11+

MS Simple IP over HRPD and LTE + MIPv4 (MIPv6)

over HRPD

HPLMN

VPLMN

V-PCRF

S9

Ty

V-PDNGW

Gxa

eNodeB

MME

ServingGW

S8a/b (GTP or PMIPv6)

S1u (GTP)

S11

S5b(PMIPv6)

Gxc

Enhanced 835 &TS 23.401/402 Standards

S101

S103

Gx (S7)

S2a(PMIPv6)

Gx

DO-LTE Reference Architecture

HomeAgentH-PCRF

* Note: This network element was also known as ePDSN

S2a

LTE Standard Reference Points (1 of 2)

S1-MME: Reference point for the control plane protocol between E-UTRAN and MME.S1-U: Reference point between E-UTRAN and Serving GW for the per bearer user plane tunnelling and inter eNodeB path switching during handover.S2a: It provides the user plane with related control and mobility support between trusted non 3GPP IP access and the Gateway.S3: It enables user and bearer information exchange for inter 3GPP access network mobility in idle and/or active state. It is based on Gn reference point as defined between SGSNs.S4: It provides related control and mobility support between GPRS Core and the 3GPP Anchor function of Serving GW and is based on Gn reference point as defined between SGSN and GGSN. In addition, if Direct Tunnel is not established, it provides the user plane tunnelling.S5-PMIP: It provides user plane tunneling and tunnel management between Serving GW and PDN GW. It is used for Serving GW relocation due to UE mobility and in case the Serving GW needs to connect to a non collocated PDN GW for the required PDN connectivity.S6a: This interface is defined between MME and HSS for authentication and authorization. S6c: It is the reference point between PDN Gateway and 3GPP AAA server/proxy for mobility related authentication if needed. This reference point may also be used to retrieve and request storage of mobility parameters. This reference point may also be used to retrieve static QoS profile for a UE for non-3GPP access in case dynamic PCC is not supported.

LTE Standard Reference Points (2 of 2)

S7: It provides transfer of (QoS) policy and charging rules from PCRF to Policy and Charging Enforcement Point (PCEF) ) in the PDN GW.S7a: It provides transfer of (QoS) policy information from PCRF to the Trusted Non-3GPP accesses.S7b: This interface is not specified within this release of the specification.S7c: It provides transfer of (QoS) policy information from PCRF to the Serving GatewayS8: It is the roaming interface in case of roaming with home routed traffic. It provides the user plane with related control between Gateways in the VPLMN and HPLMN.S9: It provides transfer of (QoS) policy and charging control information between the Home PCRF and the Visited PCRF in order to support local breakout function. In all other roaming scenarios, S9 has functionality to provide dynamic QoS control policies from the HPLMN.S10: This interface is reference point between MMEs for MME relocation and MME to MME information transfer.S11: This interface is reference point between MME and Serving GW.S103-U: This interface is the bearer interface between the EPC Serving Gateway and the HSGW,S101: This interface is the signaling interface between the EPC MME and the evolved HRPD Access Network (eAN/PCF). X2: This interface is for eNodeB to eNodeB handoff.

Evolved UTRAN Architecture

eNB

eNB

eNB

MME/SGW MME/SGW

X2

Key elements of network architecture No more RNC RNC layers/functionalities moved to eNB X2 interface for intra-eNB mobility (i.e. data/context forwarding)

Key elements of network architecture No more RNC RNC layers/functionalities moved to eNB X2 interface for intra-eNB mobility (i.e. data/context forwarding)eNB Functions RRM Header compression & encryption of data streams UL/DL resource allocation Paging BCCH info over the air MME selection during call Mobility control in LTE_Active state

eNB Functions RRM Header compression & encryption of data streams UL/DL resource allocation Paging BCCH info over the air MME selection during call Mobility control in LTE_Active state

EP

CE-U

TR

AN

S1

S1

S1 S

1

S1 S

1

X2

X2

Many-to-Many Relation between MME/SGW & eNBs

Benefits Network sharing Load balancing Network robustness

Benefits Network sharing Load balancing Network robustness

eNB

eNB

eNB

X2

EP

CE-U

TR

AN

MME/SGW MME/SGW

X2

S1

S1

S1 S

1

S1 S

1

X2

X2

S1 Architecture

Key points S1 consists of S1-MME (control traffic) and S1-U (User Traffic) Flex Architecture for both interfaces S1-U and S1-MME

Key points S1 consists of S1-MME (control traffic) and S1-U (User Traffic) Flex Architecture for both interfaces S1-U and S1-MME

eNB

eNB

eNB

eNB

MME/SAEGW

MME/SAEGW

MME/SAEGW

MME/SAEGW

Overlapping regionPool A Pool B

S1

2 entities for control plane: eNB & MME (S1-MME interface) eNB: UMTS NodeB plus UMTS RNC (RRC, Radio Bearer Management…) MME: UMTS MM and SM functions

2 entities for user plane: eNB & SGW (S1-U interface) eNB: UMTS NodeB plus UMTS RNC (PDCP/RLC/MAC…) SGW: (Serving Gateway) UMTS packet core user plane

eNB, MME and SGW Pools

•eNB1

MME

•eNB2•eNB3

•eNB4•eNB5

•eNB6•eNB7

•eNB8•eNB9

MMEMME

MME

•MME Pool A

•MME Pool B

•Pool Area X

•Pool Area Y

SGWSGW

•SGW Pool 2

MMEMMEMME

SGWSGW

SGW

•SGW Pool 1

Functional Mapping (from TR 25.813)

LTE functions in eNode-B Selection of MME at UE attachment Routing towards SGW at UE initial access NAS messaging encapsulated by RRC for tx over radio Scheduling and transmission of paging messages Scheduling and transmission of System Information Dynamic allocation of resources to UEs in both UL and DL Configuration and provision of eNB measurements Radio Bearer Control Radio Admission Control Access restrictions in Active state Connection Mobility Control in LTE_ACTIVE state Active mode Handover handling RRC, header compression, encryption, RLC, MAC, PHY Security of User plane and RRC Encryption of both in PDCP, integrity check of RRC Scheduling and associated QoS handling

internet

eNB

RB Control

Connection Mobility Cont.

eNB MeasurementConfiguration & Provision

Dynamic Resource Allocation (Scheduler)

PDCP

PHY

MME

Serving Gateway

S1MAC

Inter Cell RRM

Radio Admission Control

RLC

E-UTRAN EPC

RRC

Mobility Anchoring

SAE Bearer Control

Idle State Mobility Handling

NAS Security

MME FunctionsNAS signallingNAS signalling securityS101 – Interface between MME and eRNC for inter-RAT handoffsInter CN node signalling for mobility between 3GPP access networks (terminating S3)UE Reachability in ECM-IDLE state (including control and execution of paging retransmission)Tracking Area list managementPDN GW and Serving GW selectionMME selection for handovers with MME changeSGSN selection for handovers to 2G or 3G 3GPP access networksRoaming (S6a towards home HSS)AuthenticationBearer management functions including dedicated bearer establishment.Lawful Interception of signalling traffic.

SGW Functions

For each UE associated with the EPS, at a given point of time, there is a single Serving GW.The functions of the Serving GW, for both the GTP-based and the PMIP-based S5/S8, include: the local Mobility Anchor point for inter-eNodeB handover; assist the eNodeB reordering function during inter-eNodeB handover by

sending one or more "end marker" packets to the source eNodeB immediately after switching the path.

Mobility anchoring for inter-3GPP mobility (terminating S4 and relaying the traffic between 2G/3G system and PDN GW);

ECM-IDLE mode downlink packet buffering and initiation of network triggered service request procedure;

Lawful Interception; Packet routeing and forwarding; Transport level packet marking in the uplink and the downlink, e.g. setting

the DiffServ Code Point, based on the QCI of the associated EPS bearer; Accounting on user and QCI granularity for inter-operator charging; UL and DL charging per UE, PDN, and QCI

(e.g. for roaming with home routed traffic)

PDN GW Functions

If a UE is accessing multiple PDNs, there may be more than one PDN GW for that UE, however a mix of S5/S8 connectivity and Gn/Gp connectivity is not supported for that UE simultaneously.PDN GW functions include for both the GTP-based and the PMIP-based S5/S8: Per-user based packet filtering (by e.g. deep packet inspection); Lawful Interception; UE IP address allocation; Transport level packet marking in the uplink and downlink, e.g. setting the DiffServ

Code Point, based on the QCI of the associated EPS bearer; UL and DL service level charging as defined in TS 23.203 [6]

(e.g. based on SDFs defined by the PCRF, or based on deep packet inspection defined by local policy);

UL and DL service level gating control as defined in TS 23.203 [6]; UL and DL service level rate enforcement as defined in TS 23.203 [6]

(e.g. by rate policing/shaping per SDF); UL and DL rate enforcement based on APN-AMBR

(e.g. by rate policing/shaping per aggregate of traffic of all SDFs of the same APN that are associated with Non-GBR QCIs);

DL rate enforcement based on the accumulated MBRs of the aggregate of SDFs with the same GBR QCI(e.g. by rate policing/shaping);

DHCPv4 (server and client) and DHCPv6 (client, relay and server) functions;

UE PDN-GW User Plane Protocol Stack for PMIP based S5/S8

25 | Technical Sales Forum | May 2008

Mobility Management Entity Interfaces

S1-AP is the application protocol between eNodeB and MME

SCTP is used to guarantee delivery of signaling messages

Non-Access Stratum Protocol between UE and MME supports UE mobility and session management

S11 interface between MME and SGW uses GTP-C for bearer set up

SGW & PDN-GW Interfaces

S5 interface uses GTP-C for bearer set up between SGW and PDN-GW

Control plane protocol stack for PMIP based S5/S8 messages

HSGW Functions

Terminates S103 from SGW

PMIP Mobility Access Gateway (inter LTE-HRPD HO)

Bearer binding/flow mapping

Simple IP A10/A11+

ROHC

Need to show HSGW to PDN-GW protocol stack

Future Tutorial Topics

S1-AP Mobility management Session Management Paging Techniques LTE-LTE Handoff LTE-eHRPD Handoff Authentication – AKA Procedure

Support Information

Glossary

AAA – Authentication, Authorization, & AccountingAM – Access ManagerAN – Access NodeAS – Application ServerASN-GW – Access Service Network GateWayAT – Access TerminalATCA – Advanced Telecommunications Computing ArchitectureBTS – Base Transceiver StationCMIP – Client MIPDO – CDMA Data OnlyENodeB – LTE Base Station (or Cell)EVDO – Evolution Data Only (CDMA) – see also HRPD4G – Fourth GenerationGPRS – General Packet Radio ServiceGTP – GPRS Tunneling ProtocolIPSec – IP Security tunnel protocolHA – Home AgentHRPD – High Rate Packet DataHSPD – High Speed Packet Data

HSS – Home Subscriber SystemIMS – IP Multi-media SubsystemsLCP – Lucent Control PlatformLMA – Local Mobility AnchorLTE – Long Term EvolutionMAG – Mobility Access GatewayMIP – Mobile Internet ProtocolMME – Mobility Management EntityPCRF – Policy Charging Rules FunctionPDN GW– Packet Data Network GateWay (H=Home or V=Visited)PDSN – Packet Data Serving NodePMIP – Proxy MIPPPP – Point to Point ProtocolROHC – RObust Header CompressionSDM – Subscriber DB ManagerSGW- Signaling GateWaySRNC – Serving Radio Network ControllerTAS – Telephony Application ServerUMB – Ultra Mobile BroadbandWiMAX – Worldwide Interoperability of Microwave Access

LTE Milestone in 3GPP Standard Evolution

3GPP Releas

e

Rel’99

Rel’99 Rel’4Rel’4 Rel’5Rel’5 Rel’6Rel’6 Rel’7Rel’7 Rel’8Rel’8

UMTS FDD

DCH up to 2Mbps

UMTS FDD

DCH up to 2Mbps

Core Netw. Evolution

FDD repeaters

1.28Mcps TDD

Core Netw. Evolution

FDD repeaters

1.28Mcps TDD

HSDPA

Multimedia sub-system

HSDPA

Multimedia sub-system

HSUPA

MBMS

HSUPA

MBMS

HSPA+i.e. MIMO, CPC, DL 64-QAM, UL 16-QAM

HSPA+i.e. MIMO, CPC, DL 64-QAM, UL 16-QAM

LTELTE

Specification completion

RAN#36 (Mar.

07)

RAN#37 (Sep.

07)

RAN#38 (Dec.

07)

RAN#39 (Mar.

08)

RAN#40 (Jun.

08)

RAN#41 (Sep.

08)RAN1

65% 80% 95% CRs CRs CRs

RAN2

20% 60–80% (no ASN.1)

80-95%

CRs CRs CRs

RAN3

20% 60-80% (no ASN.1)

80-95%

CRs CRs CRs

RAN4

40% 50-80%

70-95% CRs CRs

RAN5

5% 40% 80%

Functional Mapping (from TR 25.813)

internet

eNB

RB Control




PDCP

PHY

MME

Serving Gateway

S1MAC

Inter Cell RRM


RLC

E-UTRAN EPC

RRC

Mobility Anchoring

SAE Bearer Control


NAS Security

MME Functions

Idle mode mobility

Tracking area update

Maintenance of equivalent tracking areas

Idle mode access restrictions

Security Key management

S1-u connection establishment

Idle to active mode transition

Session management

RAB and QoS

S1 handling during HO

SAE GW radio related functionality

Idle S1 GTP bearer end point

QoS handling & tunnel mgt

S1 path switch during Handover

RRM Functions (1/3)

internet

eNB

RB Control




PDCP

PHY

MME

Serving Gateway

S1MAC

Inter Cell RRM


RLC

E-UTRAN EPC

RRC

Mobility Anchoring

SAE Bearer Control


NAS Security

Inter-Cell Interference Coordination (ICIC):

Managing the radio resources (notably the radio resource blocks) such that inter-cell interference is kept under control

Load Balancing (LB): Influence the traffic load distribution in

such a manner that radio resources remain highly utilized and the QoS of in-progress sessions are maintained to the possible extent (may result in handover decisions)

Inter-RAT Radio Resource Management:

In connection with inter-RAT mobility (taking into account the involved RAT resource situation, UE capabilities & operator policies)

RRM Functions (2/3)

internet

eNB

RB Control




PDCP

PHY

MME

Serving Gateway

S1MAC

Inter Cell RRM


RLC

E-UTRAN EPC

RRC

Mobility Anchoring

SAE Bearer Control


NAS Security

Connection Mobility Control (CMC): Management of radio resources in

connection with idle or active mode Mobility of radio connections: handover

decisions based on UE & e-NodeB measurements + potentially: neighbour cell load, traffic distribution, transport & HW resources & operator defined policies

Radio Bearer Control (RBC): Establishment, maintenance & release of

Radio Bearers Taking into account overall resource

situation, QoS requirements of in-progress sessions and of the new service)

Radio Admission Control (RAC): Admit or reject the establishment

requests for new radio bearers (taking into account overall resource situation, QoS requirements & priority levels)

RRM Functions (2/3)

internet

eNB

RB Control




PDCP

PHY

MME

Serving Gateway

S1MAC

Inter Cell RRM


RLC

E-UTRAN EPC

RRC

Mobility Anchoring

SAE Bearer Control


NAS Security

Packet Scheduling (PSC) Allocate/De-allocate resources

(including buffer, processing resources & resource blocks) to UP & CP packets including: Selection of RB, whose packets are

to be scheduled Managing the necessary resources

(e.g. power levels, specific resource blocks)

LTE-HRPD Interworking 3GPP Standards – Stage 2

TR36.300 defines LTE Radio Access RAN3 defined the ASN1 (coding) of the S1-AP interface to Packet Core

3GPP Evolved Packet Core (EPC) Architecture TS 23.401 Specifies MME, SGW, PDN GW

S1-U GTP (eNodeB to SGW bearer) S1-MME GTP (eNodeB to MME control) S10 GTP (MME to MME control) S11 GTP (MME to SGW), S5a GTP (SGW to Visited PDN-GW), S8a GTP (SGW to Home PDN-GW), Gx (S7) Diameter (Home PDN-GW to Home PCRF), Gxc (S7c) Diameter (SGW to Visited PCRF) S6a Diameter (MME to HSS)

TS 23.402 EPC Enhancements for non 3GPP networks deploying LTE RAN. S101 UDP/IP (MME to DO RAN), S5b PMIPv6 (SGW to VPDN-GW) S8b PMIPv6 (SGW to Home PDN-GW) S103 GRE (SGW to HSGW) S102 A21-like UDP/IP (MME to 3G1x MSC)

3GPP TS 36.300 “Evolved Universal Terrestrial Radio Access Network (E-UTRAN)”

Defines the E-UTRAN Overall Description Defines X2 – eNodeB to eNodeB Handoff

Relevant 3GPP Release 8 Stage 3 Specifications

S1-MME E-UTRAN - MME Session management, mobility management EMM, ESM CT1 24.301S1-U E-UTRAN - MME User plane tunneling GTP-U CT4, RAN3 29.274S2a MAG - PDN GW Control and user plane from trusted non-3GPP to PDN GW PMIP CT4 29.275S2b ePDG - PDN GW Control and user plane from ePDG to PDN GW PMIP CT4 29.275

S5 (PMIP) S-GW - PDN GWUser plane tunneling and tunnel management between S-GW and PDN GW. Serving GW relocation PMIP CT4 29.275

S6a MME - HSS Authentication and authorization Diameter CT4 29.272

S6b PDN GW - 3GPP AAA

Authentication, retrieval of mobility parameters (and static QoS profile for non-3GPP access if PCC is not used) from 3GPP AAA server or proxy to PDN GW.

Diameter CT4 29.273

S6c S-GW - 3GPP AAAAuthentication and mobility parameters from 3GPP AAA proxy to S-GW Diameter CT4 29.273

Gx PCRF - PDN GWQoS policy and charging rules from PCRF to policy and charging enforcement point in PDN GW. Based on Gx Diameter CT3 29.212

GxaTrusted non-3GPP-

PCRF QoS policy information from PCRF to trusted non-3GPP access Diameter CT3 29.212

Gxc PCRF - S-GW QoS policy information from PCRF to S-GW Diameter CT3 29.212

S8 (GTP) S-GW - PDN GWInter-PLMN reference point for control and user plane between S-GW and PDN GW. Inter-PLMN variant of S5, based on Gp. GTP CT4 29.274

S8 (PMIP) S-GW - PDN GWInter-PLMN roaming interface for control and user plane between S-GW and PDN GW for home routed traffic case

PMIP CT4 29.275

S9 H-PCRF - S-PCRFQoS policy and charging information from Home PCRF to visited PCRF

Diameter CT3 29.125

S10 MME-MME Reference point between two MMEs for MME relocation GTP CT4 29.274S11 MME - S-GW Bearer control between MME and S-GW GTP CT4 29.274

S12 UTRAN - S-GWOptional reference point for user plane tunneling in direct tunnel mode is based on Iu-u GTP-U CT4 29.274

SGi PDN GW - PDN Breakout from the PDN GW to packet data network Diameter, Radius CT3 29.061

ReferencePoint Endpoints Usage Protocol WG

SpecReference


Rx PDN GW - PCRF Policy and charging information to operator's IP services Diameter CT3 29.214

S14 UE - ANDSF Dynamic provision of network selection information to UE Not defined yet CT1 24,302

S15ANDSF - Non-3GPP access

Dynamic exchange of information between ANDSF and non-3GPP IP access network Not defined yet

StaTrusted non-3GPP -

PCRFAAA information and mobility and charging information from 3GPP server or proxy to trusted non-3GPP access

Diameter CT4 29.273

Swa untrusted non-3GPP - 3GPP AAA

AAA information and mobility information from 3GPP server or proxy to an untrusted non-3GPP access

Diameter CT4 29.273

SWd3GPP AAA proxy -

3GPP AAA server Links the AAA proxy to the AAA server via intermediate networksDiameter CT4 29.273

SWm 3GPP AAA - ePDGAAA information and mobility parameters from 3GPP AAA proxy or server to ePDG Diameter CT4 29.273

SWnUntrusted non-3GPP - ePDG Forces the tunneled traffic from the UE towards ePDG

PMIP CT4 29.275

Swu UE - ePDG

UE initiated establishment and tear down of IPSec tunnel. Fast update of IPSec tunnels during handover between two untrusted non-3GPP accesses IKEv2, MOBIKE CT1 24,302

N.N.UE -

trusted/untrusted non-3GPP access

Access authentication (mandatory for trusted, optional for untrusted access) EAP AKA CT1 24.302

SWx3GPP AAA Server -

HSSAuthentication data from the HSS to 3GPP AAA server Diameter CT4 29.273

S101 MME-HRPD ANOptimized Handover Procedures and Protocols between EUTRAN Access and cdma2000 HRPD Access CT4 29.277

S102cdma2000 HRPD

accessOptimized Handover Procedures and Protocols between EUTRAN Access and 1xRTT Access

CT4 29.276

S103cdma2000 1xRTT

accessOptimized Handover Procedures and Protocols between EUTRAN Access and cdma2000 HRPD Access

CT4 29.277

USIM/ME USIM - UE USIM interface T=0 CT6 31.102, 31.111


SpecReference


Cx HSS – CSCF Location management, user data handling, user authentication Diameter CT4 29.228, 29.229Dx I-SCSCF – SLF Subscription Locator Query, used in conjunction with Cx interface Diameter CT4 29.228, 29.229Gm UE – P-CSCF Multi-media type services SIP CT1 24.229ISC S-CSCF – AS Subscription to event notification, convey charging info SIP CT1 24.229

Mw

Mr

CSCF – CSCF

Call Control Protocol for use in IP Multimedia CN subsystem SIP, SDP CT1 24.229

Mj

S-CSCF – MRFC

Mx

CSCF – Ext. IMS Mn MGCF– IMS-MGW Support for PSTN/ISDN emulation as required by ETSI TISPAN H.248 CT4 29.332

Sh AS – HSS Data handling, Subscription Notification Diameter CT4 29.328, 29.329

Ut UE – AS Service Configuration Data Manipulation for Supplementary Services XCAP, HTTP CT4 24.423


SpecReference

Mg

Mi

CSCF – MGCF

Mp Allows MRFC control of media resources provided by MRFP H.248 CT4 29.333

Rf AS – CDF Offline Charging reference point Diameter SA5 32.260, 32.299

Ro AS/MRFC – OCS Online Charging reference point Diameter SA5

MRFC – MRFP

Dh AS – SLF Subscription Locator Query, used in conjunction with Sh interface Diameter CT4 29.328, 29.329

32.260, 32.299

Presence Ref Points

CT1 24.141Manage presence information of a user device, service or service media SIP, XCAPVarious



BGCF – BGCF

CSCF – IBCF

BGCF – MGCF

CSCF – BGCF Call Control Protocol for use in IP Multimedia CN subsystem SIP, SDP CT1 24.229





Mk

Mm

LTE ARCHITECTURE – Control Plane Layout over S1

eNB

PHY

UE

PHY

MAC

RLC

MAC

MME

RLC

NAS NAS

RRC RRC

PDCP PDCP

UE eNode-B MME

RRC sub-layer performs: Broadcasting Paging Connection Mgt Radio bearer control Mobility functions UE measurement reporting & control

PDCP sub-layer performs: Integrity protection & ciphering

NAS sub-layer performs: Authentication Security control Idle mode mobility handling Idle mode paging origination

LTE ARCHITECTURE – Control Plane Layout over S1

eNB

PHY

UE

PHY

MAC

RLC

MAC

MME

RLC

NAS NAS

RRC RRC

PDCP PDCP

UE eNode-B MME

LTE ARCHITECTURE – User Plane Layout over S1

UE eNode-B SAE

eNB

PHY

UE

PHY

MAC

RLC

MAC

PDCPPDCP

RLC

SAE Gateway

LTE ARCHITECTURE – User Plane Layout over S1

UE eNode-B MME

eNB

PHY

UE

PHY

MAC

RLC

MAC

PDCPPDCP

RLC

SAE GatewayRLC sub-layer performs: Transferring upper layer PDUs In-sequence delivery of PDUs No error correction through ARQ Duplicate detection Flow control Concatenation/re-assembly of packets

PDCP sub-layer performs: Header compression Ciphering

MAC sub-layer performs: Scheduling Error correction through HARQ Priority handling across UEs & logical channels In-sequence delivery of RLC PDUs Multiplexing/de-multiplexing of RLC radio bearers into/from PhCHs on TrCHs

Physical sub-layer performs: DL: ODFMA, UL: SC-FDMA HARQ UL power control Multi-stream transmission & reception (i.e. MIMO)

LTE-HRPD Interworking 3GPP Standards – Stage 2 (continued)

Three 3GPP2 LTE-HRPD standards documents… 3GPP2 TSG-C C.S0087-0 Inter-working Specification for cdma2000 1x, High

Rate Packet Data and Long Term Evolution Systems– eAT new ProtocolIDs and new tunneling-related protocols

TSG-A A.S0022-0 “E-UTRAN-HRPD Connectivity/Interworking: Core Network Aspects”: Based on the existing HRPD IOS specification to support:

– A11+ UDP/IP (DO RAN to HSGW)

– S101 UDP/IP (DO RAN to MME)

TSG-X.0057 “E-UTRAN-HRPD Connectivity/Interworking: Core Network Aspects”

– Defines E-TRAN-eHRPD connectivity and Interworking Architecture

– Define HSGW functions and interfaces

– S2a PMIP v6 (HSGW to PDN-GW)

– Gxa (S7a) Diameter (HSGW to PCRF)

– S101 UDP/IP (DO RAN to MME)

– S103 GRE (SGW to HSGW)

39018631 LTE Overview

Documents

Transcript of 39018631 LTE Overview