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IEEE 802.21 MEDIA INDEPENDENT HANDOVER

DCN: 21-06-0747-00-0000-Idle-Mode-and-Paging

Title: Media Independent Paging Service

Date Submitted: November, 2006

Presented at IEEE 802.21 session #17 Dallas

Authors or Source(s):

Muthaih Venkatachalam, Shweta Shrivastava, James Tsai, EmilyQi, Vivek Gupta (Intel Corporation)

Abstract: This presentation talks about standard message and

primitive requirement in support of Media Independent PagingService in multi-radio environment.


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IEEE 802.21 presentation release statements

This document has been prepared to assist the IEEE 802.21 WorkingGroup. It is offered as a basis for discussion and is not binding on thecontributing individual(s) or organization(s). The material in this

document is subject to change in form and content after further study.The contributor(s) reserve(s) the right to add, amend or withdrawmaterial contained herein.

The contributor grants a free, irrevocable license to the IEEE toincorporate material contained in this contribution, and any modificationsthereof, in the creation of an IEEE Standards publication; to copyright inthe IEEEs name any IEEE Standards publication even though it mayinclude portions of this contribution; and at the IEEEs sole discretion topermit others to reproduce in whole or in part the resulting IEEEStandards publication. The contributor also acknowledges and acceptsthat this contribution may be made public by IEEE 802.21.

The contributor is familiar with IEEE patent policy, as outlined in Section6.3 of the IEEE-SA Standards Board Operations Manual

and inUnderstanding Patent Issues During IEEE Standards Developmenthttp://standards.ieee.org/board/pat/guide.html>
http://standards.ieee.org/guides/opman/sect6.htmlhttp://standards.ieee.org/guides/opman/sect6.html


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Agenda

Motivation

Idle Mode and Paging

Paging in multi radio environment

Standard Message and Primitive Requirements


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Motivation

For a single radio MN, idle Mode and Paging has already been

proposed independently in WiMax, 3GPP and WiFi to extendbattery standby time

In a multi radio environment, the MN may have multiple radiosand each radio may be in connected or idle state. There is

an opportunity to provide paging service via connected radioand aggregate paging messages across multi radios

Fewer paging messages across network infrastructure

Fewer number of active radios on MN

Multi Radio Paging can lead to considerable power saving at

the MN and also provide radio/network/device resourceoptimization at the mobile communication infrastructure


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Use Case of Idle Mode & Paging with a single Radio

Data packets

Paging

Controller

Idle Mode

messages

Enter Idle Mode

Location Update

Exit Idle Mode

Paging

Paging

Paging

Paging

Data packets


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3GPP- LTE Paging

UE eNBs in TA MME/UPE

Bufferdata

User Data

Check UEstate, TA

Paging MessagePaging Message

Paging Response

Paging Response

UP establishment

Encrypted data

UE eNBs in TA MME/UPE

Bufferdata

User Data

Check UEstate, TA

Paging MessagePaging Message

Paging Response

Paging Response

UP establishment

Encrypted data

eNB

eNB

eNB

MME/UPE MME/UPE

S1

X2

X2

X2

EPC

E-UTRAN

3GPP-LTE Network Architecture 3GPP-LTE Paging Protocols

UE enters IDLE mode when there is no activity.

Discontinuous Reception (DRX) UE uses DRX in IDLE mode, i.e. wakes upperiodically to check for paging messages.

UE learns DRX cycle length upon network entry from the eNodeB.

UE is registered at Tracking Area Level.


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WiMAX Paging

Paging controller (PC) is a logical entity that administers activity of Idle modeMS. It may be co-located with BS or ASN Gateway. A PC may monitor one ormore paging groups.

Paging Agent (PA) entity, co-located with BS, handles the interaction betweenPC and paging functionality implemented in BS.

Location Register (LR) is a database that contains information about Idle modeMSs.

PC is responsible for sending paging messages and handling location updates.


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WLAN PagingIdle Mode Operation

STA advertises Paging Capability Discovery

Non-AP STA enters Idle Mode AP broadcasts Paging Indications (partial virtual bitmap), and STA wakes up toreceive paging indication

Non-AP STA exits Idle Mode

Paging Group (PG) - a group of APs in which STA can be paged A Mobility Domain comprises one or more Paging Groups A STA must reassociate if it transitions to an AP in a different Paging Group

Paging Server Provides Paging Services and Paging key management Serves one or more Paging Groups

AP

AP

AP

AP

AP

AP

AP

AP

AP

AP

AP

AP

AP

AP

Paging group #1

Paging group #2

Paging Server #2

Paging group #3

Paging Server #1


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Paging Summary in a single radio environment

For each individual Radio,Key Paging Messages

Paging Capability Discovery

Enter/Exit Idle Mode

Location Update (sent by MN aka Idle Mode Update)

MS sends location update to the infrastructure

Paging Indication (sent by infrastructure)

MS periodically wakes up to check whether it is being paged or not

Key Concept and Logical Entity

Paging Group Paging Server (or Paging Controller)


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Multi Radio Paging and Benefits

In a multi radio environment, the MN may have multiple radios

and each radio may be in connected or idle states

Multi Radio Paging Benefits

All Paging messages via the connected radio Paging Indication Message sent via the connected radio

Location Update via the connected radio

Paging aggregation minimizes message exchange Paging Indication Message aggregation

Location Update aggregation

Idle Mode Enter/Exit aggregation

Therefore, what do we need from standards ?


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Proposed Standard Engagements

IEEE 802.21: Standard Message Primitives

Paging capability Primitives

Location Update Primitives

Enter/Exit Idle Mode (Radio State update) Primitives

Paging Indication Primitives

IEEE 802.16, 802.11, LTE (?): MAC layer messages

RAN specific Containers/Transport to carry above messages

IETF/3GPP: IP Layer messages (back end)

Messages between Paging Controllers

Between Paging Controller and PoA (BS/AP).


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Call to Action

Form a study group in 802.21 to study Paging service inmulti radio environment

Investigate requirement for standards based multi radioprimitives


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Reference

21-06-0701-00-0000-Media independent idle mode andpaging.ppt, by Muthaih Venkatachalam (IntelCorporation)

11-06-0950-04-000v-wlan-paging-and-idle-mode.ppt,by Emily Qi et al


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Backup


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Paging via connected radio

MS_aBS/AP

of radio r_k

PCof radio r_k

PCof radio r_i

Paging announce on r_kto turn on r_i

1a

PC of r_j

Pagingannounce on r_kto turn onr_i

Is your radio in connectedmode in MS_a?

Is your radio in connectedmode in MS_a?

Yes! r_k is in connected

mode in MS_a

Inter PC co-ordination

2

1b

3

5

4

MSG #1, #2,

#3, #4, and#5: IETF

BS/AP Paging AnnouncementPrimitives: IEEE 802.21Possible Contents: Paging and PagingMedia/Radio Interface

MS receiving Paging AnnouncementPrimitives: IEEE 802.21Possible Contents: Paging and PagingMedia/Radio Interface

Scenario User is browsing on the WiFi interface

User gets a voip call on the WiMAX interface. WiMAX network needs to page the user


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Location Update via connected radio

BS/APof radio r_i

LU for r_k (sent on radior_i)

PCof radio r_i

PCof radio r_k

LU for r_k (sent on radior_i)

LU forr_k (sent on radio r_i)

LU_RSP forMS

LU_RSP for MS

LU_RSP for MS (sent onr_i)

User has WiFi connection that is currently active and WiMAX connectionthat is idle.

Instead of contending on the WiMAX airlink, MS uses the WiFi radio toperform location update for its WiMAX radio

All MSGs: IETF

BS/AP Location Update Request/ResponsePrimitives: IEEE 802.21Possible Contents: Paging and PagingMedia/Radio Interface, Location Information

MS Location Update Request/ResponsePrimitives: IEEE 802.21Possible Contents: Paging and Paging

Media/Radio Interface, Location Information


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Aggregated Location Update

If the PGs are overlapping, perform a single LU operation for multiple radios.

Minimizes messaging and processing at the MS

BS/AP

of radio r_i

LU for r_i,j,k (sent on

radio r_i)

PC

of radio r_i

PC

of radio r_j

LU for r_i,j,k (sent on

radio r_i)

LU for r_k (sent on radio r_i)

LU_RSP for MS

LU_RSP for MS

LU_RSP for MS (sent on

r_i)

PC

of radio r_k

LU for r_j (sent on radio r_i)

LU_RSP for MS

MS

BS/AP Location UpdateRequest/Response Primitives: IEEE802.21Possible Contents: Paging andPaging Media/Radio Interface,

Location Information

MS Location UpdateRequest/Response Primitives:IEEE 802.21Possible Contents: Paging andPaging Media/Radio Interface,Location Information

MSGs: IETF

ExtendedLocationUpdateMessage for

Multi radio:IEEE 802.16,802.11


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Paging-aggregation

Page on a single idle radio to wake up multiple idle radios.

MSBS/AP

of radio r_i

PC

of radio r_i

BS/PC

of radio r_j

Paging on r_i (meant forradios r_i,j,k)

1

BS/PCof radio r_k

IM exit for r_i,j,k

Paging on r_i (meant forradios r_i,j,k)

Extended PagingAnnouncement Message

for Multi radio: IEEE802.16, 802.11

MS receiving Paging AnnouncementPrimitives: IEEE 802.21

Possible Contents: Paging and PagingMedia/Radio Interface

BS/AP Paging Announcement

Primitives: IEEE 802.21Possible Contents: Paging andPaging Media/Radio Interface


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Idle mode Entry/ExitScenario: Multiple radios are switched to idle mode

For example: when the user takes a break, hisWiMAX, WiFi and 3G connections may go into idlemode

IM Entry/Exit for radios i, j , k happens on radio-i.

MSBS/AP

of radio r_i

IM_entry for r_i, r_j, r_k

(sent on radio r_i)

PC

of radio r_i

PC

of radio r_j

PC

of radio r_k

IM_entry for MS on r_i, r_j,r_k (sent on radio r_i)

IM_entry for MS

IM_entry for MS

1

2

3

4

IM_entry_RSP for MS(paging parameters for r_j)

IM_entry_RSP for MS (contains paging params for r_k)

5

6

IM_entry_RSP for MS(paging params for r_i,j,k)

7

IM_entry_RSP forMS(paging params for

r_i,j,k)8

MSGs: IETF (IPPaging?)

MS Enter/Exit Idle ModeRequest/ResponsePrimitives: IEEE 802.21Possible Contents: Pagingand Paging Media/RadioInterface, Location

Information

BS/AP Enter/Exit Idle ModeRequest/Response Primitives:IEEE 802.21Possible Contents: Paging andPaging Media/Radio Interface,Location Information

Extended Idle ModeRequest/Response messagesfor Multi radio: IEEE 802.16,

802.11

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