Mobility Management with Multi-Carrier Support for IEEE 802.16m

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Document Number: C802.16m-08/564

Date Submitted: 2008-07-07

Source: Kelvin Chou [email protected]

Yih-Shen Chen [email protected]

I-Kang Fu [email protected]

Paul Cheng [email protected]

MediaTek Inc.No.1, Dusing Rd. 1, Hsinchu Science-Based Industrial Park,

Hsinchu, Taiwan 300, R.O.C.

Venue: IEEE 802.16m-08/024 “Call for Comments and Contributions on Project 802.16m System Description Document (SDD)”

In response to the topic: Upper MAC concepts and methods (mobility management)

Base Contribution: N/A

Purpose: To be discussed and adopted by TGm for the 802.16m SDD

Mobility Management with Multi-Carrier Support for IEEE 802.16m

2

OutlineOutline

Multi-Carrier Mobility Management Design Concept

Scanning with Multi-Carrier Support

Intra-Frequency Handover

Inter-Frequency Handover

SDD Text Proposal

3

Multi-Carrier Mobility Management Design ConceptMulti-Carrier Mobility Management Design Concept

The MS may maintain its normal operations with the serving BS on one carrier (using one RF) while perform scanning or network re-entry to the target BS on another carrier (by another RF)

ServingBase Station

(FA #1)

TargetBase Station

(FA #2)

Mobile Station

RF

#2

RF

#1

Primary Carrier

data transmission Sca

nning

, initia

l rang

ing

netw

ork r

e-en

try

4

Scanning in Multi-Carrier SystemScanning in Multi-Carrier System

In cell reselection, the MS scans primary (fully-configured) carriers of neighbor BSs

The MS may also scan other primary carriers of its serving BS

initial ranging

Initial ranging

Sca

nnin

g in

terv

al

DL synchronization with carrier #1 of BS #2


MS

RF

S-BS

Full conf

Partial conf

Full conf

Partial conf

BS #2

Full conf

Partial conf

Full conf

Partial conf

BS #3

Full conf

Partial conf

Full conf

Partial conf

DL synchronization with carrier #3 of the Serving BS

initial ranging


Initial ranging


Sca

nnin

g in

terv

alS

cann

ing

inte

rval

5

Scanning with Multi-Carrier Support Scanning with Multi-Carrier Support (1/4)(1/4)

Scanning using the RF other than the one for its primary carrierThe MS dedicates its secondary RF for either normal scanning or autonomous scanning

In normal scanning, the scanning request/response messages can be exchanged over either the primary carrier or the secondary carrier

Scanning operations go in parallel with normal operations on the primary carrier

Frequency band 1

Frequency band 2

Frequency band 3

Neighbor BS #2

Normal operations

Serving BS

Neighbor BS #1

Scan neighbor cells using the secondary RF

Maintain normal operations with the S-BS

on the primary carrier

DL synchronizationInitial ranging

6


An example of the MSC for scanning using secondary RFRF #2 is dedicated to scanning

Scanning request/response can be exchanged via either carrier #1 or carrier #2


Initial ranging (association)


Scanning request

Scanning response

Ranging responseInitial ranging if

possible and needed

Initial ranging (association)

Ranging responseInitial ranging if

possible and needed

Request scheduled scanning intervals, not necessary for

autonomous scanning

MS

RF #1Primary carrier

RF #2Secondary

carrier

Serving BS


RF #2Secondary

carrier

BS #2

RF #1Carrier #1

RF #2Carrier #2

BS #2

RF #1Carrier #1

RF #2Carrier #2

7


Scanning using multiple RFs simultaneouslyPerform DL channel evaluation and synchronization to multiple frequency bands via multiple RFs simultaneously

To expedite the scanning operation (e.g. fast cell reselection)

Frequency band 1

BS #1

Frequency band 4

Frequency band 3

BS #4

Use RF #1 to scan BS #1 and BS #2

BS #3

Use RF #2 to scan BS #3 and BS #4

Frequency band 2

BS #2

8


An example of the MSC for scanning using multiple RFs simultaneously

Scanning request(duration=N frames)

Scanning resonse(start frame = M frames

duration = N frames)M frames

Scanning interval(N frames)

S-BS

DL synchronization with BS #1


BS #1 BS #2 BS #3 BS #4



Additional alternations of

scanning interval and interleaving intervals

Request scheduled scanning intervals, not necessary for

autonomous scanning

MS


RF #2Secondary

carrier

9

Intra-Frequency Handover Intra-Frequency Handover (1/5)(1/5)

Handover Scheme #1RF #1: primary carrier with S-BS until T-BS DL synchronization is done

RF #2: DL synchronization (and initial ranging if possible) with T-BS

DescriptionThe MS may use another RF (e.g. RF #2) to acquire the DL/UL channel parameters of the target BS (e.g. timing/frequency offset ) before disconnecting its primary carrier (e.g. on RF #1) from the serving BS

After the DL/UL channel parameters are obtained, RF #2 may proceed to network reentry to the target BS, or it can pass the parameters to RF #1 to complete network reentry

AdvantageReduced handover interruption time

Serving BS

Target BS

1. Use RF #2 to acquire DL/UL channel parameters

3. Network reentry using RF #1 or #2

12

2. Disconnect the primary carrier from the S-BS 3

10


Handover Scheme #1 - Scenario 1The MS synchronizes with the target carrier (the primary carrier to handover to) of the target BS before disconnecting from the serving BS

The MS maintains its primary carrier with the S-BS (e.g. using RF #1) and uses another RF (e.g. RF #2) to synchronize to the DL channel on the primary carrier of the T-BS and acquire the DL/UL parameters

Remaining network reentry procedures (including initial ranging) are completed using RF #2 after the primary carrier to the S-BS has been disconnected

HO request

Primary carrier connected

HO indication

RF #2 performs DL synchronization to the primary

carrier of the target-BS

HO response

DL synchronization, DL/UL parameters acquisition


MS

RF #1 onprimary carrier

RF #2 onsecondary

carrier

Serving BS

RF #1Carrier #1(serving)

RF #2Carrier #2

Target BS

RF #1 carrier #1(target)

RF #2Carrier #2

RF #2 performs network reentry to the target-BS Initial ranging, reauthorization, registration, etc.

11


Handover Scheme #1 - Scenario 2The MS synchronizes with a fully-configured carrier of the target BS other than the target carrier before disconnecting from the serving BS

The MS maintains its primary carrier with the S-BS (e.g. using RF #1) and uses another RF (e.g. RF #2) to perform initial ranging to a fully-configured carrier of the T-BS other than the target carrier

Remaining network reentry procedures are completed using RF #1 after disconnecting from the S-BS

The ranging parameters acquired by RF #2 (UL timing, power, etc.) are used by RF #1 to expedite its network reentry process

HO request


HO indication

RF #2 performs initial ranging with the secondary carrier of the

target BS

HO response

DL synchronization, DL/UL parameters acquisition, initial ranging


RF #1 performs network reentry to the target-BS

MS

RF #1 onprimary carrier

RF #2 onsecondary

carrier

Serving BS

RF #1Carrier #1(serving)

RF #2Carrier #2

Target BS

RF #1 carrier #1(target)

RF #2 carrier #2

Pass acquired parameters (UL timing, power, etc) to RF#1 for network reentry

Initial ranging, reauthorization, registration, etc.

12


Handover Scheme #2RF #1:

Primary carrier with S-BS until new primary carrier with the T-BS is established

Scheduled sleeping intervals

RF #2: network reentry to the T-BS within sleeping intervals

DescriptionThe MS puts its primary carrier (e.g. carrier #1) into sleep mode and uses another carrier (e.g. carrier #2) for network reentry to the target BS within the sleeping intervals of its primary carrier

The primary carrier to the serving BS maintains connected until the new primary carrier to the target BS is established

AdvantageMake-before-break HO

Serving BS

Target BS

1. Request sleep intervals for the primary carrier

2. Use carrier #2 for handover network reentry within the sleeping

intervals of the primary carrier

3. New primary carrier is established on carrier #2

1

24


13


An example of the MSC for HO scheme #2Primary carrier goes sleep upon receiving Fast Ranging IE

RF #2 sends RNG_REQ within the sleep interval of the primary carrier

MOB_HO-REQ

Primary carrier

Primary carrier established

MOB_HO-RSP (Action Time)

RF #1: sleepRF #2: NW reentry

MS

RF #1 RF #2S-BS T-BS

1 fra

me

MOB_HO-IND (Serving BS leaving)

MOB_HO-IND (Serving BS release)

Fast Ranging IE

RNG_REQ

RNG_RSP

HO Confirm (MC HO)

HO Ack

HO requestHO response

Action Time

14

Inter-Frequency Handover Inter-Frequency Handover (1/3)(1/3)

Handover Scheme #1 can also be used for inter-frequency handoverRF #1: primary carrier with S-BS until initial ranging to the T-BS is done

RF #2: initial ranging to the T-BS

DescriptionThe MS synchronizes with the target carrier of the target BS before disconnecting from the serving BS

The MS maintains its primary carrier with the S-BS (e.g. using RF #1) and uses another RF (e.g. RF #2) to perform initial ranging to the primary carrier of the T-BS

Remaining network reentry procedures (including initial ranging) are completed using RF #2 after the primary carrier to the S-BS has been disconnected

AdvantageHandover interruption time is reduced

Serving BS

Target BS

1. Use carrier #2 to acquire DL/UL channel parameters

3. Network reentry via carrier #1 or #2

12


Frequency band 1

Frequency band 2

15


Frequency band 2

Frequency band 1

Serving BS

Target BS

1. Use carrier #2 to perform network reentry

2. Established primary carrier to the T-BS on

carrier #2

13


Handover Scheme #3RF #1: primary carrier with S-BS until new primary carrier with T-BS is established

RF #2: network reentry to the T-BS

DescriptionUsing the secondary RF (any RF other than the one for the primary carrier) for network reentry

The primary carrier to the serving BS maintains connected until the new primary carrier to the target BS is established

New primary carrier is established on the secondary RF

AdvantageMake-before-break HO

16


An example of the MSC for HO scheme #3

HO request/response

New primary carrier established

HO indication(serving BS release)

Disconnect RF #2 from S-BS if it is

connected

HO indication(serving BS leaving)

MS

RF #1(carrier #1)

RF #2(carrier #2)

Serving BS

Carrier #1(FA #1)

Carrier #2(FA #2)

Target BS

Carrier #1(FA #1)

Carrier #2(FA #2)

Primary carrier

Network re-entry

17

Summary of Multi-Carrier Handover SchemesSummary of Multi-Carrier Handover Schemes

Handover Scheme #1Intra-frequency handover

Inter-frequency handover

Handover Scheme #2Intra-frequency handover

Inter-frequency handover

Make-before-break handover

Handover Scheme #3Inter-frequency handover

Make-before-break handover

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SDD Text ProposalSDD Text Proposal

Add the following text into Session 10 of the SDD (IEEE 802.16m-08/003)

----------------------- text begin -----------------------------------------------------------------------------

10.x Data/Control plane

10.x.y MAC Handover Procedures

10.x.y.z Handover with Multi-Carrier Support

The MS may use a secondary RF (any RF other than the one for the primary carrier with its serving BS) to perform full or part of the handover procedures. In this case, multiple RFs can be used cooperatively to reduce the handover interruption time or to achieve make-before-break handover.

----------------------- text end -------------------------------------------------------------------------------

Documents

Mobility Management with Multi-Carrier Support for IEEE 802.16m