802 Handoff Measurement Considerations

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802 Handoff Measurement Considerations

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(No Transcript)
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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
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11h
SME
PLME
MLME
Channel Switch Decision
MAC Timing
Channel Switch Timing
CHANNEL SWITCH
Measurement Processing
MEASURE
Measurement Policy
Measurement Frames
MREQUEST /MREPORT
MREQUEST /MREPORT
SME
MLME
Measurement Frames
MeasurementPolicy
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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
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AP Measurements
802.11f Context Blob
802.11h Request For Info
or
802.11f Context Blob
10/100BaseT
AP1
STA1
Per STA Table
AP Table
Processor
Certs Pre-auth User CIM Schema QoS
802.11f Context Blob
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Card Measurements
AP1
STA1
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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
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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
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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
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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
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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
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Elements of Radio Measurement
Base Measurements Per AP Measurements Per STA
Measurements Requested Measurements Handoffs to
Higher Layers Measurement Policies Measurement
Topologies
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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
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Per AP Measurements
SSID
Model
STA Assoc
BSS
ESS
APs Seen
STA Seen
DR
Loading
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Per STA Measurements
SSID
Model
AP Assoc
BSS
ESS
APs Seen
STA Seen
DR
Optimum AP
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Requested Measurements
Frame Report
Report Request
Reports
NDIS
Linux
RPI Histogram
Needing Definition Report Request Frame
Report RPI Histogram Reports Linux NDIS SNMP
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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
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Measurement Policies
Needing Definition SME Measurement
Policies 11h Measurement Policies
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Measurement Topologies
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1
3
4
5
Needing Definition Per BSS Topology Per ESS
Topology Per Radio View Topology
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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
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Post Authentication and 4-handshake
Accounting Server
RADIUS (AAA)
Accounting-Request(Start)
A
B
C
D
E
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Proactive Key Distribution
RADIUS Authentication Server (AS)
Accounting Server
Notify-Request
Notify-Request
A
B
C
D
E
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Proactive Key Distribution Authentication
AS
Access-Request
Access-Accept(key material)
Access-Accept(key material)
Access-Request
A
B
C
D
E
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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

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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

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