3GPP Telecommunication Systems
Today & Tomorrow
Gert-Jan van Lieshout
Samsung Electronics Research Institute
Deventer, The Netherlands
[email protected]
Mobile and Wireless; 25-3-2010
Global Standard & Strategy
Outline
Outline
3rd Generation Partnership Project (3GPP) [3]
UMTS Release-99
Introduction [4-6]
UMTS Radio Interface Protocol Architecture / UMTS Network Architecture
Universal Terrestrial Radio Access Network (UTRAN) [7-13]
Access Stratum <-> Non Access Stratum [14-22]
UMTS evolution
UMTS radio in Rel-5,6,7,8….. [23-25]
PS CN evolution: IP Multimedia Core Network System (IMS) [25-34]
Rel-5 reference architecture [35]
Changing Telecom landscape [36]
Long Term Evolution (LTE) / Enhanced Packet Core(EPC) [37–46]
Design goals
UMTS <-> LTE radio comparison
LTE/EPC Architecture
LTE-advanced
Summary [47]
Mobile and Wireless; 25-3-2010
Global Standard & Strategy
2
3GPP
3GPP structure
(Europe)
(USA)
(China)
(Japan)
(Korea)
(Japan)
WWW.3GPP.ORG
Mobile and Wireless; 25-3-2010
Global Standard & Strategy
3
UMTS Rel-99: Introduction
Reminder
Radio Interface Protocol Architecture
L3
Radio
Bearers
Control
PDCP
control
control
control
control
RRC
RLC
RLC
PDCP
L2/PDCP
RLC
RLC
RLC
RLC
RLC
BMC
L2/BMC
RLC
L2/RLC
Logical
Channels
MAC
L2/MAC
Transport
Channels
PHY
Medium Access Control protocol
Packet Data Convergence Protocol
Mobile and Wireless; 25-3-2010
L1
Radio Link Control protocol
Radio Resource Control Protocol
Global Standard & Strategy
Source: 25.301
4
UMTS Rel-99: Introduction
Data flow
example
- loading
a web
page
Reminder
Application
~ 2 kByte
Application object
HTTP segment
~ 2 kByte
HTTP
Header
TCP segment
492+20 Byte
IP packet
512+20 Byte
MAC PDU
42+1 Byte
L1
43+2 Byte
Mobile and Wireless; 25-3-2010
RLC
Header
MAC SDU
RLC SDU
MAC
Header
TB
Global Standard & Strategy
TCP
Header
PDCP
Header
PDCP SDU
RLC SDU
TCP payload
IP
Header
IP payload
PDCP PDU
492+2 Byte
RLC PDU
40+2 Byte
TCP
Header
TCP payload
RLC
Header
MAC SDU
CRC
TB
MAC
Header
CRC
5
UMTS Rel-99: Introduction
UMTS network architecture
BSS
A
MSC
CS-domain
PSTN/
ISDN
Gb
HLR
Iu
Uu
UTRAN
Iu
GSN
PS-domain
Gi
IP
CN
Two CN domains:
- Circuit-Switched (CS) domain
- Packet-Switched (PS) domain
Mobile and Wireless; 25-3-2010
Global Standard & Strategy
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UMTS Rel-99: UTRAN
The CRNC role
Core Network
Iu
Iu
UTRAN
RNS
RNS
Iur
CRNC
Iub
Node B
Iub
CRNC
Iub
Node B
Node B
Iub
Node B
• Each RNC acts as Controlling RNC (CRNC) for the directly
connected Node Bs and cells
Mobile and Wireless; 25-3-2010
Global Standard & Strategy
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UMTS Rel-99: UTRAN
UTRAN Architecture
Core Network
Iu
Iu
UTRAN
RNS
RNS
Iur
RNC
Iub
Node B
RNC
Iub
Iub
Node B
Node B
Iub
Node B
Uu (the “radio interface”)
UTRAN:
RNS:
RNC:
Node B:
UE:
UTRA Network
Radio Network Subsystem
Radio Network Controller
“Base station”
User Equipment
Mobile and Wireless; 25-3-2010
UE
Source: 25.401
Global Standard & Strategy
8
UMTS Rel-99: UTRAN
The SRNC role
Core Network
Iu
Iu
UTRAN
RNS
SRNS
Iur
RNC
Iub
Node B
SRNC
Iub
Iub
Node B
Node B
Iub
Node B
UE
• Each connected mode UE is controlled by a Serving RNC (SRNC)
• The SRNC terminates Iu towards the CN
Mobile and Wireless; 25-3-2010
Global Standard & Strategy
9
UMTS Rel-99: UTRAN
The DRNC role
Core Network
Iu
Iu
UTRAN
DRNS
Macro Diversity
Combining splitting
function
SRNS
Iur
DRNC
Iub
Node B
SRNC
Iub
Iub
Node B
Node B
Iub
Node B
UE
• WCDMA requires soft handover (macro diversity)
• An RNC lending resources to an SRNC for a specific UE acts as a
Drift RNC (DRNC).
Mobile and Wireless; 25-3-2010
Global Standard & Strategy
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UMTS Rel-99: UTRAN
Functionality split between nodes
Serving RNC
Overall control of the radio connection to a UE in connected mode
Drift RNC
Lending resources to SRNC for specific UE
Controlling RNC
Overall control of the radio resources of a cell: codes, power, interferen
ce
Node B
Radio transmission & reception
UE
Connected mode: acts under the control of the SRNC
Idle mode: procedures specified in 25.304 (UE Idle Mode behaviour)
Mobile and Wireless; 25-3-2010
Global Standard & Strategy
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UMTS Rel-99: UTRAN
Why Iur ?
Core Network
Iu
Iu
UTRAN
DRNS
SRNS
Iur
DRNC
Iub
Node B
SRNC
Iub
Iub
Node B
Node B
Iub
Node B
UE
• Enable inter-RNC Soft handover
• Hide radio network functions from CN
• Avoid ping-pong effects on CN
Mobile and Wireless; 25-3-2010
Global Standard & Strategy
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UMTS Rel-99: UTRAN
Connected mode Inter-RNC mobility
Core Network
Core Network
Iu
DRNS
Iu
SRNS
Iur
SRNS
RNS
Cells
Without
SRNS Relocation
UE
UE
With SRNS Relocation
When changing RNC area, there are two options:
immediate SRNS Relocation, i.e. move SRNC role to the new RNC
or use Iur and retain old SRNC (do SRNS Relocation later or never)
Mobile and Wireless; 25-3-2010
Global Standard & Strategy
13
UMTS Rel-99: AS <-> NAS
Uu (radio) interface: Terminal to Network
UE
Uu
Mobile and Wireless; 25-3-2010
Network / “Infrastructure side”
Global Standard & Strategy
14
UMTS Rel-99: AS <-> NAS
Iu interface: Separates RAN from CN
Non-Access Stratum functionality
Access Stratum, Radio Network functionality
- all WCDMA specific functionality
- no user service specific functionality
UE
UTRAN
Uu
Mobile and Wireless; 25-3-2010
Iu
Global Standard & Strategy
CN
15
UMTS Rel-99: AS <-> NAS
Connected vs. Idle mode
UE1 ->
Iu-Conn. Y
Iu-connection Y
Core Network
Iu
UE2 ->
LA 403
Iu
UTRAN
= Data
record
UE1 ->
Cell X
RRC-connection
X
Cells
LA 403
(Location Area)
Uu (the “radio interface”)
UE 1, Connected
mode
Mobile and Wireless; 25-3-2010
UE 2, Idle mode
Global Standard & Strategy
16
UMTS Rel-99: AS <-> NAS
Radio Access Bearers & Radio Bearers
NAS requests AS for Radio Access Bearer (RAB)
A RAB consists of 1 or more RAB subflows
To give Unequal Error Protection to different bits, e.g. coded speech
Each RAB subflow corresponds to one Radio Bearer
The Radio Bearer is the service of L2 of the Radio Interface
UTRAN selects WCDMA channel type and parameters based on:
QoS requirement of the Radio Access Bearer
Observed traffic pattern
Radio resources available
RLC
Mobile and Wireless; 25-3-2010
Global Standard & Strategy
Radio Access Bearers
-> Radio Bearers
RLC
RLC
RLC
Layer 2 RLC
17
UMTS Rel-99: AS <-> NAS
UMTS Bearer Model
UMTS
TE
MT
UTRAN
CN
Gateway
CN Iu
EDGE
NODE
TE
End-to-End Service
TE/MT Local
Bearer Service
UMTS Bearer Service
Radio Access Bearer Service
Radio Bearer
Service
Iu Bearer
Service
UTRA FDD/
TDD Service
Physical
Bearer Service
External Bearer
Service
CN Bearer
Service
Backbone
Bearer Service
Access Stratum
Mobile and Wireless; 25-3-2010
Source: 23.107
Global Standard & Strategy
18
UMTS Rel-99: AS <-> NAS
UMTS Bearer / RAB classes
Source: 23.107
Mobile and Wireless; 25-3-2010
Global Standard & Strategy
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UMTS Rel-99: AS <-> NAS
RAB Attributes
Source: 23.107
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