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Fast Handover. Date: 2009-05-10. Authors:. AP1 stores STA1’s SSPN information. AP1 police the frames from STA1 based on STA1’s SSPN information. Create SSPN Interface. SSPN Context Req. SSPN Context Response. GAS Query Response. GAS Query Req. The Interworking Service. SSPN. Gateway.

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Fast Handover

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Fast handover

Fast Handover

Date: 2009-05-10

Authors:

L. Chu et al


The interworking service

AP1 stores STA1’s SSPN information.

AP1 police the frames from STA1 based on STA1’s SSPN information.

Create SSPN Interface

SSPN Context Req

SSPN Context Response

GAS Query Response

GAS Query Req

The Interworking Service

SSPN

Gateway

Portal

DS

WLAN

AP2

AP1

BSS2

STA1

BSS1

L. Chu et al


The interworking service1

AP1 stores STA1’s SSPN information.

AP1 police the frames from STA1 based on STA1’s SSPN information.

SSPN Interface

GAS Comeback Response

GAS Comeback Req

The Interworking Service

SSPN

Gateway

WLAN

Portal

DS

AP2

AP1

BSS2

STA1

BSS1

L. Chu et al


Sta handover

AP2 does not have STA1’s SSPN information.

AP2 can not police STA1’s frames.

SSPN will wrongly send service provision instructions to AP1.

SSPN Interface

GAS Comeback Response

GAS Comeback Req

STA Handover

SSPN

Gateway

WLAN

Portal

DS

STA1’s SSPN Interface??

AP2

AP1

BSS2

STA1

BSS1

L. Chu et al


Solution rate limiting transfer

The target AP gets rate limiting information from the current AP:

In over-the-air FT method, a STA notifies the target AP of the current AP’s ID. Then the target AP gets interworking context through InterworkingContext IE from the current BSS by two new public action frames: InterworkContexgtReq and InterworkContextResponse.

The payload of InterworkingContext is a generic container that includes the interworking context.

In over-the-DS FT method, when the current AP receives FT Request or FT Confirm, it insert InterworkingContext IE to the frame and forwards it to the target AP.

Solution – Rate Limiting Transfer

L. Chu et al


Over the air ft context transfer

When a STA with enabled interworking sends Reassociation Request, it notifies the target AP of its current BSS.

The target AP gets interworking context from the current BSS through two new public action frames: InterworkContexgtReq and InterworkContextResponse.

Over-the-air FT Context Transfer

STA

Current

AP

Target

AP

Data Transmission

Authentication Request (FTAA, RSNIE, MDIE, FTIE)

Authentication Response (FTAA, RSNIE, MDIE, FTIE)

Reassociation Request (RSNIE, MDIE, FTIE, RIC-Request, Current AP ID)

InterworkContextReq ()

InterworkContextResponse (InterworkingContext IE)

Reassociation Response (FTAA, RSNIE, MDIE, FTIE, RIC-Response)

Data Transmission

L. Chu et al


Over the ds ft context transfer

When the current AP receives FT Request, it inserts InterworkingContext IE in FT Request and forwards it to the target AP.

Over-the-DS FT Context Transfer

STA

Current

AP

Target

AP

Data Transmission

FT Request (FTAA, RSNIE, MDIE, FTIE, InterworkingContext IE)

FT Response (FTAA, RSNIE, MDIE, FTIE)

Reassociation Request (RSNIE, MDIE, FTIE, RIC-Request)

Reassociation Response (FTAA, RSNIE, MDIE, FTIE, RIC-Response)

Data Transmission

L. Chu et al


Over the air ft context transfer with resource request

When a STA with enabled interworking sends Authentication Confirm, it notifies the target AP of its current BSS.

The target AP gets interworking context from the current BSS through two new public action frames: InterworkContexgtReq and InterworkContextResponse.

Over-the-air FT Context Transfer with Resource Request

STA

Current

AP

Target

AP

Data Transmission

Authentication Request (FTAA, RSNIE, MDIE, FTIE)

Authentication Response (FTAA, RSNIE, MDIE, FTIE)

Authentication Confirm (FTAA, RSNIE, MDIE, FTIE,

RIC-Request, Current AP ID)

InterworkContextReq ()

InterworkContextResponse (InterworkingContext IE)

Authentication ACK (FTAA, RSNIE, MDIE, FTIE,

RIC-Response)

Reassociation Request (RSNIE, MDIE, FTIE)

Reassociation Response (FTAA, RSNIE, MDIE, FTIE)

Data Transmission

L. Chu et al


Over the ds ft context transfer with resource request

When the current AP receives FT Confirm, it inserts InterworkingContext IE in FT Confirm and forwards it to the target AP.

Over-the-DS FT Context Transfer with Resource Request

STA

Current

AP

Target

AP

Data Transmission

FT Request (FTAA, RSNIE, MDIE, FTIE)

FT Response (FTAA, RSNIE, MDIE, FTIE)

FT Confirm (FTAA, RSNIE, MDIE, FTIE,

RIC-Request, InterworkingContext IE)

FT ACK (FTAA, RSNIE, MDIE, FTIE,

RIC-Response)

Reassociation Request (RSNIE, MDIE, FTIE)

Reassociation Response (FTAA, RSNIE, MDIE, FTIE)

Data Transmission

L. Chu et al


Solution routing sspn s notification to the destination bss

The notification information from the SSPN is sent to the target AP:

Method1:

The target AP notifies the portal in access network of the association change of the STAs,

The portal in access network records the STA and AP’s mapping information,

The portal forwards SSPN notification to the destination AP.

Method2: The target AP (SME of the AP) notifies the central network (for example, SSPN) to change the association information of the STA.

Solution – Routing SSPN’s Notification to the Destination BSS

L. Chu et al


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