802 Handoff Measurement Considerations
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802 Handoff Measurement Considerations. +. SME. SME. Measurement Policy. Measurement Policy. Channel Switch Decision. MREQUEST /MREPORT. MREQUEST /MREPORT. CHANNEL SWITCH. MEASURE. MLME. MLME. Channel Switch Timing. Measurement Processing. Measurement Frames. Measurement

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802 Handoff Measurement Considerations

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March 2003

802 Handoff Measurement Considerations

+

Richard Paine, Boeing


March 2003

Richard Paine, Boeing


Tgh layer management model

SME

SME

Measurement

Policy

MeasurementPolicy

Channel Switch

Decision

MREQUEST

/MREPORT

MREQUEST

/MREPORT

CHANNEL

SWITCH

MEASURE

MLME

MLME

Channel Switch

Timing

Measurement

Processing

Measurement

Frames

Measurement

Frames

MAC Timing

PLME

TGh layer management model

  • Extract from 802.11h-D2.1.32, which addresses some measurement extensions for DFS and TPC.

Figure 26 – Layer Management Model

Richard Paine, Boeing


March 2003

11h

SME

PLME

MLME

Channel Switch

Decision

Channel Switch

Timing

MAC Timing

CHANNEL

SWITCH

Measurement

Processing

MEASURE

Measurement

Policy

Measurement

Frames

MREQUEST

/MREPORT

MREQUEST

/MREPORT

SME

MLME

Measurement

Frames

MeasurementPolicy

Richard Paine, Boeing


March 2003

WLAN Context Transfer

Subnet A

802.11

802.16

R

Subnet B

802.11

R

802.11f Context Blob

(Certificates, pre-auth, address, etc)

802.11

Context Transfer Packet

Richard Paine, Boeing


March 2003

AP Measurements

802.11f

Context

Blob

802.11h

Request

For Info

or

802.11f

Context

Blob

10/100BaseT

AP1

STA1

AP Table

Per STA Table

Processor

Certs

Pre-auth

User

CIM Schema

QoS

802.11f

Context

Blob

Richard Paine, Boeing


March 2003

Card Measurements

AP1

STA1

Richard Paine, Boeing


March 2003

RRM Big Picture

Application Users of Radio Information

Upper

Layers

Presentation

Session Users of Radio Information

Transport Users of Radio Information

IP Users of Radio Information

Interface to

Upper Layers

MAC Radio Information

MAC

MAC and PHY

Layers

PHY Radio Information

PHY

Richard Paine, Boeing


Rrm extension options

RRM Extension Options

  • RRM blue stars show the likely location of RRM extensions, though RRM pink stars are (remotely) possible.

  • RRM Applications are outside the 802.11 specs.

SME

RRM

Applications

(outside

802.11)

MAC SAP

MAC

MLME

RRM

MLME SAP

RRM

PHY SAP

PLME SAP

PLCP

PLME

RRM

PLME SAP

RRM

PMD SAP

PMD

RRM

Richard Paine, Boeing


March 2003

AP1

STA1

RRM MAC/PHY Interchanges

Frame

Report

Report

Request

Reports

NDIS

SME

MAC SAP

MAC

MLME

11h Get

Linux

MLME SAP

RPE Histogram

Req-Air

PHY SAP

PLME SAP

PLCP

PLME

PLME SAP

Get

CCA

CCA

MGT

PMD SAP

PMD

CCA REQ

CCA RCV

Mgt Frames

Beacon on Setup

Richard Paine, Boeing


March 2003

AP1

AP1

AP1

AP1

AP1

AP1

STA1

STA1

STA1

STA1

STA1

STA1

MLME

MLME

MLME

MLME

MAC

MAC

MAC

MAC

PLCP

PLCP

PLCP

PLCP

PLME

PLME

PLME

PLME

PMD

PMD

PMD

PMD

MAC/PHY Context

802.11f Context Blob

802.11h Request for Information

SME

SME

MLME

MAC

MLME

MAC

PLCP

PLCP

PLME

PLME

PMD

PMD

AP STA

AP STA

802.11h Request for Information

SME

SME

SME

SME

STA1

STA2

STA3

STA4

Richard Paine, Boeing


March 2003

RRM Interface Services

Reports from the SME

Requests to the SME

Requests from SME to MLME

Requests from MLME to SME

Passing Requests and Receiving Responses Across the PLME SAP

Passing Requests and Receiving Responses Across the PMD

Information to higher layers with SNMP MIBs

Information to higher layers outside SNMP MIBs

Richard Paine, Boeing


March 2003

Elements of Radio Measurement

Base Measurements

Per AP Measurements

Per STA Measurements

Requested Measurements

Handoffs to Higher Layers

Measurement Policies

Measurement Topologies

Richard Paine, Boeing


March 2003

Base Measurements

1 RSSI

2 Signal Quality

3 RPI Histogram

4 PSNI

5 DR

6 Loading (requested vs served)

7 Transmit Power

8 Link Margin

Richard Paine, Boeing


March 2003

Per AP Measurements

Richard Paine, Boeing


March 2003

Per STA Measurements

Richard Paine, Boeing


March 2003

Requested Measurements

Frame

Report

Report

Request

Reports

NDIS

Linux

RPI Histogram

Needing Definition:

Report Request

Frame Report

RPI Histogram

Reports

Linux

NDIS

SNMP

Richard Paine, Boeing


March 2003

Handoffs to Higher Layers

Interface to

Upper Layers

MAC Radio Information

MAC

MAC and PHY

Layers

PHY Radio Information

PHY

Needing Definition:

NDIS Objects

Linux Objects

Wind River Objects

Richard Paine, Boeing


March 2003

Measurement Policies

Needing Definition:

SME Measurement Policies

11h Measurement Policies

Richard Paine, Boeing


March 2003

Measurement Topologies

2

1

3

4

5

Needing Definition:

Per BSS Topology

Per ESS Topology

Per Radio View Topology

Richard Paine, Boeing


Neighbor definition and graph

Neighbor Definition and Graph

  • Two APs i and j are neighbors iff

    • There exists a path of motion between i and j such that it is possible for a mobile STA to perform a reassociation

    • Captures the ‘potential next AP’ relationship

    • Distributed data-structure i.e. each AP or AS/RS can maintain a dynamic list of neighbors

A

B

A

E

C

E

C

B

D

D

1

Richard Paine, Boeing


Post authentication and 4 handshake

Post Authentication and 4-handshake

Accounting Server

RADIUS (AAA)

Accounting-Request(Start)

A

B

C

D

E

Richard Paine, Boeing


Proactive key distribution

Proactive Key Distribution

RADIUS Authentication Server (AS)

Accounting Server

Notify-Request

Notify-Request

A

B

C

D

E

Richard Paine, Boeing


Proactive key distribution authentication

Accounting

Proactive Key Distribution Authentication

AS

Access-Request

Access-Accept(key material)

Access-Accept(key material)

Access-Request

A

B

C

D

E

Richard Paine, Boeing


March 2003

RRM Services & Paper Topics

  • Setup Service - beacon

  • AP MIB Service - Related Configuration and Statistics

  • AP Measurements Service Outside the MIB (per AP)

  • STA Measurements Service Outside the MIB (per STA)

  • Distribution Service of RRM Information to APs and STAs

  • AP and STA Statistics Gathering Service

  • Commanded STA Action Service

  • STA Autonomous Action Service

Richard Paine, Boeing


Future allocation utilization

Static Spectrum Management is Limited in Its Ability to Improve Spectrum Utilization Efficiencies

Future Allocation & Utilization

  • Fixed Spectrum Assignments Lead to Inefficient Spectrum Utilization

    • Opportunities Exist in Time, Frequency, and Geography

  • RF Spectrum Allocated by Policy

    • Allocations, Assignments, and Incumbents Vary by Country

Heavy Use

Heavy Use

Sparse Use

Medium Use

  • Observations Show Bands of Local Heavy and Sparse Activity

    • Temporal Usage Characteristics Vary by Band & Service

    • Potential for Usage Dependent on Incumbent Service & Equipment

Richard Paine, Boeing


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