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Doc.: IEEE 802.21-xxx Submission May 10-14, 2004 Alan Carlton, Interdigital CommunicationsSlide 1...
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Transcript of Doc.: IEEE 802.21-xxx Submission May 10-14, 2004 Alan Carlton, Interdigital CommunicationsSlide 1...
May 10-14, 2004
Alan Carlton, Interdigital Communications
Slide 1
doc.: IEEE 802.21-xxx
Submission
Defining Layer 2.5
Alan Carlton
Interdigital Communications
May 10-14, 2004
Alan Carlton, Interdigital Communications
Slide 2
doc.: IEEE 802.21-xxx
Submission
Objectives
To stimulate a discussion on the preferred 802.21 Mobility Architecture
To stimulate a discussion on the scope of 802.21 To review Typical Mobile System architecture
approaches as they may pertain to the broad objectives of 802.21
May 10-14, 2004
Alan Carlton, Interdigital Communications
Slide 3
doc.: IEEE 802.21-xxx
Submission
Mobile System Terminology Used in this Presentation
Two key modes exist for typical mobile systems - IDLE mode and CONNECTED mode: IDLE mode (STA) characteristics
No User service, monitoring of paging channels, available service request channels 100% of Receiver available for Downlink Measurements Background coordination, unscheduled AP/technology reselection
CONNECTED mode (STA) characteristics Active User service (e.g. a call), Handover possible Limited Receiver availability for measurements (User service takes priority) Fully Coordinated, scheduled AP/technology handover
Selection: Prior to entering IDLE mode (e.g. at Power up) the STA must perform selection in order to determine the
best AP and technology available for service
Reselection: While in IDLE mode (i.e. No User service) the STA must continuously examine neighbor AP (and different
technology AP). Upon determination of a ‘better’ AP the STA will transition over to the new AP
Handover While in CONNECTED mode (i.e. Active User Service) a handover occurs upon transition from one AP to
another AP (possibly using a different technology) offering significantly better service. In the ideal case this transition will occur without noticeable interruption of the Active User Service.
May 10-14, 2004
Alan Carlton, Interdigital Communications
Slide 4
doc.: IEEE 802.21-xxx
Submission
The Cellular Mobility Model
GSM1800
AP
Cellular STA
Network
GSM900
AP
EDGE
AP
GSM/900
AP
GSM900
APGSM900
AP
FDD
AP
Centralized Radio Resource Management Approach
Semi-Static Frequency Assignments
Ful
l Mob
ility
Sup
port
Handover Policy
Function
e.g. GSM Base Station
e.g. FDD Node B
e.g. 2G MS, 3G UE
e.g. 2G BSC, 3G RNC
Radio Network
e.g. Switch, Server
May 10-14, 2004
Alan Carlton, Interdigital Communications
Slide 5
doc.: IEEE 802.21-xxx
Submission
The Cellular Mobility Model (Continued) Radio Network Characterization:
Centralized RRM approach (Semi-Static Frequency assignments in each AP) Some Radio Planning Required
IDLE Mode Operation: Intra-technology (e.g. GSM to GSM)
AP Selection/Reselection decision made in STA supported by System information broadcast by the Handover Policy function (Policy defined in the Handover Policy function)
Inter-technology (e.g. GSM to FDD/WCDMA) AP Selection/Reselection decision made in STA supported by System information broadcast at the Handover
Policy function (Policy defined in the Handover Policy function)
CONNECTED Mode Operation: Intra-technology
AP handover decision made in the Handover Controller function supported by measurements made by the STA and sent to the Handover Policy function via L3 signaling (Policy defined in the Handover Policy function)
Inter-technology AP handover decision made in the Handover Policy function supported by measurements made by the STA
and sent to the Handover Policy function via L3 signaling (Policy defined in the Handover Policy function)
May 10-14, 2004
Alan Carlton, Interdigital Communications
Slide 6
doc.: IEEE 802.21-xxx
Submission
The WLAN Mobility Model - Current
IEEE 802.X STA
Network
802.11a
AP802.11
AP
802.11b
AP802.11a
AP
802.11
AP
802.16
AP
802.11n
AP
iBook
Dynamic Frequency Assignments
Distributed Radio Resource Management Approach
e.g. Gateway, Router
Lim
ited
Mob
ility
Sup
port
Radio Network
May 10-14, 2004
Alan Carlton, Interdigital Communications
Slide 7
doc.: IEEE 802.21-xxx
Submission
The WLAN Mobility Model (Continued) Radio Network Characterization:
Distributed RRM approach (Dynamic Frequency assignments in each AP) Radio Planning Not Required
IDLE Mode Operation: Intra-technology (e.g. 802.11a to 802.11a)
AP Selection/Reselection decision made autonomously in STA (Policy defined in the STA) Inter-technology (e.g. 802.11 to 802.16)
SELECTION/RESELECTION NOT STANDARDIZED – SCOPE OF 802.21 CONNECTED Mode Operation:
Intra-technology
HANDOVER NOT STANDARDIZED – SCOPE OF 802.21 Inter-technology
HANDOVER NOT STANDARDIZED – SCOPE OF 802.21
General Scope of 802.21
May 10-14, 2004
Alan Carlton, Interdigital Communications
Slide 8
doc.: IEEE 802.21-xxx
Submission
The WLAN Mobility Model – Enhanced (802.21)
802.11a
AP
IEEE 802.X STA
Network
802.11
AP
802.16
AP
802.11b
AP
802.11a
AP802.11
AP
802.11n
AP
iBook
Dynamic Frequency Assignments
Two Basic Options Are Considered
Radio Network
e.g. Gateway, Router
Enh
ance
d M
obili
ty S
uppo
rt (
802.
21)
CENTRALIZED Handover
Policy Function
DISTRIBUTED Handover
Policy Function
Option A Option B
ST
A O
NL
Y SY
ST
EM
May 10-14, 2004
Alan Carlton, Interdigital Communications
Slide 9
doc.: IEEE 802.21-xxx
Submission
Option A & Option B Definition IDLE Mode Operation:
Intra-technology (e.g. 802.11a to 802.11a) AP Selection/Reselection decision made autonomously in STA (Policy defined in the STA)
Inter-technology (e.g. 802.11 to 802.16) [SCOPE OF 802.21] Option A: AP Selection/Reselection decision made autonomously in STA (Policy defined in the STA)
Option B: AP Selection/Reselection decision made in STA supported by System information broadcast at the Handover Policy function level (Policy defined in the Handover Policy Function)
CONNECTED Mode Operation: Intra-technology [SCOPE OF 802.21]
Option A: AP handover decision made autonomously in STA (Policy defined in the STA)
Option B: AP handover decision made in the Handover Policy function supported by measurements made by the STA and sent to the Handover Policy function via new signaling mechanisms (Policy defined in the Handover Policy Function)
Inter-technology [SCOPE OF 802.21] Option A: AP handover decision made autonomously in the STA (Policy defined in the STA)
Option B: AP handover decision made in the Handover Policy function supported by measurements made by the STA and sent to the Handover Policy function via new signaling mechanisms (Policy defined in the Handover Policy Function)
May 10-14, 2004
Alan Carlton, Interdigital Communications
Slide 10
doc.: IEEE 802.21-xxx
Submission
Option A: DISTRIBUTED Handover Policy Function
Option A Provides a Very Limited Mobility Solution
MAC Sublayer
MAC Sublayer
ME
Physical Sublayer
ME
PLCP Sublayer
PMD Sublayer H
and
ov
er P
oli
cy
Fu
nct
ion
STA Functional Architecture Concept
Intra/Inter Technology Reselection decision made autonomously by the STA Adequate but sub-optimal solution
Intra/Inter Technology Handover decision made autonomously by the STA Slow Handover Solution /Really just an
extension of Reselection and would be characterized as such in a typical Mobile system
Break and then Make strategy (Resource availability not guaranteed)
Adequate solution for non real-time services
Unacceptable solution for real time services (such as voice)
Poorly scaleable solution
Local MIB802.11 Model
May 10-14, 2004
Alan Carlton, Interdigital Communications
Slide 11
doc.: IEEE 802.21-xxx
Submission
Option B: CENTRALIZED Handover Policy Function
Option B Provides a Full Mobility Solution – Typical Mobile System Architecture Approach
MAC Sublayer
MAC Sublayer
ME
Physical Sublayer
ME
PLCP Sublayer
PMD Sublayer L
ayer
2.5
Sig
nal
ing
/Co
ntr
ol
Fu
nct
ion
System HPF
STA Functional Architecture Concept
Measurements
System Info
Handover Intra/Inter Technology Reselection decision supported by System Information Optimal solution
Intra/Inter Technology Handover decision coordinated by RPF and supported by measurement reports and System signaling Fast Handover Solution Make and then Break strategy (Resource
availability is guaranteed) Adequate solution for non real-time
services Acceptable solution for real time services
(such as voice) Easily scaleable solution
802.11 Model
May 10-14, 2004
Alan Carlton, Interdigital Communications
Slide 12
doc.: IEEE 802.21-xxx
Submission
Typical Mobile System Architecture compared to 802.X
Transparent Mode Option
Transparent Mode Option
Physical
GSM RR
MAC
RLC
Convergence
IPMobility Protocol (MM)
Physical
3G RRC
MAC
RLC
Convergence
IPMobility Protocol (MM)
Net
wo
rk
GPRS (2G) STA 3GPP (3G) STA
Ph
ysic
alD
ata
Lin
k
GSM 04.18 3GPP 25.331
User Plane
Control Plane
User Plane
Control Plane
In a Full Mobility Solution Layer 2.5 is a key enabler
IEEE 802.xx STA
e.g. Mobile IP
Physical
MAC
LLC
Convergence
IP
IEEE 802.3,11,16…
IEEE 802.2
Transparent Mode Option
Layer 2.5IEEE 802.21
May 10-14, 2004
Alan Carlton, Interdigital Communications
Slide 13
doc.: IEEE 802.21-xxx
Submission
Key Protocol Functions
Mobility Protocol Resource Control Protocol(e.g. GSM-MM/MAP, Mobile IP…) (e.g. GSM-RR, 3GPP RRC, L2.5?)
System Information Termination (or Paging) Cell Selection/Reselection Establishment Release Measurement Reporting Power Control Handover at Radio Level
Discovery Registration Tunneling Termination (or Paging) Handover at Network Level Security
Both Functions are required in order to support a Full Mobility Solution
May 10-14, 2004
Alan Carlton, Interdigital Communications
Slide 14
doc.: IEEE 802.21-xxx
Submission
Station Function Network/Radio Network Functions
Layer 2.5
Mobility Protocol
Higher Layers
Physical
MAC
LLC
U-P
lan
e
Layer 2.5
Physical
MAC
Link Layer
Handover Policy
Function
Mobility Protocol
Higher Layers
U-P
lan
e
Lower LayersLower Layers
802.11a
AP
802.11a
AP
802.11
AP
CENTRALIZED Handover Policy
Function
IEEE 802.X STA
iBook
Network
Example: End to End Functional Configuration
e.g. Gateway, Router
The RHF may be defined as logical functional entity
May 10-14, 2004
Alan Carlton, Interdigital Communications
Slide 15
doc.: IEEE 802.21-xxx
Submission
Conclusions The Option B architecture with a centralized Handover Policy Function would seem to
be the most promising approach and is recommended. In order to provide a full mobility solution both Radio Mobility (e.g. GSM RR) and
Network Mobility (e.g. Mobile IP) protocol functionality is required in the system. Layer 2.5 is a key enabler in a full mobility solution. In order to support the Option B Architecture 802.21 should define a Layer 2.5
Signaling and Control Protocol with some similar properties to RR style protocols currently used in typical Mobile systems.
The Handover Policy Function may be defined as a logical entity. It is not necessary to define any restrictions in the Standard on its location in a physical implementation though some recommendations may be made if valuable.
The Option B architecture closely maps to well proved typical Mobility System architectures and will simplify future advanced interworking scenarios unanticipated at this time (e.g. tightly coupled handover).
The Centralized Handover Policy Functional architecture may be easily extended to support Wireless to Wired interworking scenarios e.g. the Handover policy upon connecting a Wireless device to a Wireline system may be automatic handover.