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Transcript of Integrated Programmable Communications, Inc. November, 2001 doc.: IEEE 802.15-01/484r0 Submission...
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 1
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: Analysis of Mode H and Mode L and Related Merger Proposals for AFHDate Submitted: November 1, 2001
Source: YC Maa, HK Chen, Shawn Liu and KC Chen
Company: Integrated Programmable Communications, Inc. Address: Taiwan Laboratories Address: P.O. Box 24-226, Hsinchu, Taiwan 300TEL +886 3 516 5106, FAX: +886 3 516 5108, E-Mail: {ycmaa, hkchen, shawnliu, kc}@inprocomm.com Re: [IEEE 802.15-00/367r1, IEEE 802.15-01/082r1, IEEE 802.15-01/246r1, IEEE 802.15-01/252r0, IEEE 802.15-01/366r1, IEEE 802.15-01/382r0, IEEE 802.15-01/385r0, IEEE 802.15-01/386r0, IEEE 802.15-01/491r0]
Abstract: This presentation compares mode H, mode L, as well as different merging proposals for AFH mechanisms.
Purpose: Submission to TG2 for analyzing mode H, L and different AFH merger proposals for draft consideration.
Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing 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 withdraw material contained herein.Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 2
Analysis of Mode H and Mode L and Related Merger Proposals for AFH
KC Chen,YC Maa, HK Chen, and Shawn LiuIntegrated Programmable Communications, Inc.
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 3
Outline
Review of AFH: Mode H and Mode LReview of Different Merger Proposals
01/382r001/385r001/491r0
Conclusion
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 4
Review of AFH (1)
Adaptive Frequency Hopping (AFH):Non-collaborative mechanism enabling the
coexistence of 802.15.1 devices and ISM band frequency-static devices (e.g. 802.11b)
Dynamically change the frequency hopping sequence to avoid or mitigate the interference seen by 802.15.1 devices.
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 5
Review of AFH (2)
Flow of AFH Device Identification and Operation mode Channel Classification Exchange of Channel Information Initiate/Terminate AFH
Device Identification
Channel Classification
Classification Information exchange
AFH
Mechanism
1 2 3 4
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 6
Review of AFH (3): Inside AFH Mechanism
Frequency synthesizer
mapping
Original hopping sequence generator
Hop clock
RF input signal
partition sequence
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 7
Review of AFH (4) AFH merger baseline document: 01/252r0 (May01)
Voted & unanimously approved in May01 meeting initial draft text 01/366r1 in Jul01 meeting
Mode H baseline document: 01/246r0 (May01) When the number of usable channels are sufficient (no less than the
minimum required number)• Use Usable channels only
When the number of usable channels are insufficient • Use Usable and Kept channels intelligently
Mode L baseline document: 00/367r1 (Mar01) When the number of usable channels are sufficient
• Use Usable channels only When the number of usable channels are insufficient
• Use Usable and “fill-in” channels blindly• Higher packet error rate, and throughput will suffer
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 8
Channels are classified into 3 groups: (dynamic classification) Usable channel set SU: uninterfered or good channels (size = NU) Kept channel set SK: interfered channels kept for AFH (size = NK) Removed channel set SR : interfered channels left out in AFH (size = NR) NU + NK + NR = 79
Define Nmin to be the minimum number of channels that a Bluetooth device must hop over.
Usable and Kept need to be considered, based on Nmin, NU: Nmin NU: only use usable channels in the hopping sequence Nmin > NU: require kept channels in addition to usable channels in the new
hopping sequence, where kept channels NK = Nmin–NU
When kept channels are required, both “partition sequence” and “mapping” mechanisms are executed.
When kept channels are not required, only “mapping” mechanism is executed.
Review of AFH (5): Mechanism
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 9
Review: Three Merging Proposals
01/382r0, 01/385r0, 01/491r0
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 10
Review: 01/382r0 - mode H mapping
fgen NU
.SU..
fadp
XH bank of usable channels
.
.
.
bank of kept channels
1 0
NK
YH
1
0
pseq
The paths drawn in black are exactly the
same structure as mode L
Top path: the kept & removed channels are mapped to usable channels
Middle path: the usable & removed channels are mapped to kept channels
Mod
1
0
Bottom path: bypass if original channel is already in the desired set specified by pseq
XH: shifting signal of mode H to equalize channel utilization
YH: bypass control signal of mode H
pseq: partition sequence specifying using SU or SK
SK
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 11
Review: 01/382r0 - mode L mapping
fgen
Mod
NU
.
.
.
.
fadp
XL
YL
bank of usable channels1
0
Top path: the kept & removed channels are mapped to usable channels
Bottom path: bypass if original channel is already usable
fgen: hopping sequence before doing AFH
fadp: hopping sequence after mapping
XL: shifting signal of mode L to equalize channel utilization
YL: bypass control signal of mode L
SU
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 12
Review - 01/382r0 Merging Proposal Structural Comparison:
Mode H: • Path 1 - the kept & removed channels are mapped to usable channels • Path 2 - the usable & removed channels are mapped to kept channels• Path 3 - bypass
Mode L: • Path 1: the kept & removed channels are mapped to usable channels • Path 2: bypass
Mathematical Comparison: Mode H is equivalent to Mode L when
1. pseq = 1, i.e. map to usable channels only.
2. XH=XL , same shifting signals
3. YH=YL , same bypass paths
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 13
Review - 01/382r0 Merging Proposal
Mode H is superset of Mode L, mode L is a special case of Mode H.
Structurally and Mathematically compared, Mode H is equivalent to Mode L when usable channels are sufficient.
Mode H implements both modes of AFH should be the basis for merging AFH
mechanisms
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 14
Review - 01/385r0 Merge Proposal
Selection
Box27
UAP/LAP
CLOCK
fgen
23/79 Mode
Frequency
Replacement
fadp
AM_ADDR CLKE12-1 / CLKN12-1
12
28 Grouping /
paringfout
2. Remove as many ‘bad’ channels as required /
legally possible.
3. Use remaining ‘bad’ channels in
intelligent manner.
1. Bluetooth Hopping Sequence
generator
Different Naming: Frequency Replacement for Mode L Grouping/Pairing for Mode H
Block Concatenation instead of functional merge
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 15
not_usable channels- use mapping for replacementusable channels- bypass The structure is identical to the mode L block
diagram shown in of 01/382r0.
Frequency Replacement of 01/385r0
fadpfgen
RANDW
12
Mod NG
.
Good channel bank
7
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 16
Grouping/Pairing of 01/385r0
01/385r0 does not show any block diagram on Grouping/Pairing.
From the context of 01/386r0, the “grouping/pairing” block should be the same mode H block diagram as shown in 01/382r0.
Mode H already includes the “frequency replacement” functionality.
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 17
Review – Redundancy in 01/385r0 Merge Proposal
Redundant functions appear both in the first “frequency replacement” block and the second “grouping/pairing” blockAdderModuloMapping Table (bank for channels)
They should be merged wherever possible
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 18
Review - 01/385r0Merge or Concatenation?
Merge should reduce the overall complexity.
Concatenation is not a mergeIt adds up the complexityfrequency replacement redundant
functionality
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 19
Review - Interoperability in 01/385r0 Merge Proposal
Under 01/385r0, four different Bluetooth devices will exist Bluetooth 1.1 legacy device Device only using frequency replacement Device only using grouping/pairing Device using both of the above two schemes
Interoperability nightmares! Deals with different vendor designs Results in complex LMP commands and operations
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 20
Review - 01/491r0 Merged AFH Draft
PartitionSequenceGenerator
Traffic type(ACL or SCO)
LegacyHop
Kernel
phase(master's clock)
address(master's identity)
FrequencyRe-mapper
p(k)
fhop (khop)fadp
Channel Conditions(SU , SK , NU , NK )
Channel Conditions(SU , SK , NU , NK )
Single AFH Mechanism to accommodate mode H and mode L
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 21
Review - 01/491r0 Merged AFH Draft
A single AFH mechanism to accommodate both mode H and mode L
Conforms to previous agreements01/252r0 in May01 01/366r1 in Jul01 meetings
Structurally similar to 01/382r0 proposalLMP commands to be finished up as of
11/5/01
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 22
Conclusion &
Recommendation
Integrated Programmable Communications, Inc.November, 2001 doc.: IEEE 802.15-01/484r0
Submission
InProComm, Inc.Slide 23
Conclusion
AFH merger proposal (01/382r0) and AFH draft (01/491r0)provides unified and merged framework of
AFH mechanismperfectly complies with May01 voting and
Jul01 chairman’s instruction.Mode H and Mode L have been fully
implemented and incorporated in the proposal and draft.