Transcript 19-05-0018-00-0000_802.15.1a Coexistence Characteristics

June 2005
doc.: IEEE 802.19-05/0018r0
802.15.1a Coexistence Characteristics
Date: 2005-06-20
Authors:
Name
Company
Address
Phone
email
Tom Siep
CSR
2425 N. Central
Expressway, Dallas,
TX 75080
+1 214 558 4358
[email protected]
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Submission
Slide 1
Tom Siep, Cambridge Silicon Radio Plc
June 2005
doc.: IEEE 802.19-05/0018r0
Abstract
Summary of 802.15.1a characteristics to serve as a basis
for coexistence analysis.
This submission was originally presented to a coexistence
assurance ad hoc committee of 802.11n and updated to
include information discussed therein.
Submission
Slide 2
Tom Siep, Cambridge Silicon Radio Plc
June 2005
doc.: IEEE 802.19-05/0018r0
General Description of 802.15.1a
•
Frequency Band
–
–
–
•
79, 1 MHz
Non-overlap
Spread spectrum type:
–
–
–
–
•
2.4-2.4853 GHz (FCC 47CFR15.247)
2.4-2.4835 GHz (ETSI ETS 300-328)
2.4-2.4835 GHz (ARIB STD-T66)
Channels
–
–
•
USA
Europe
Japan
Frequency hopping
Pseudo-random hopping uses all 79 channels (exception: see Coexistence Characteristics)
1600 hops / sec normal operation
3200 hops / sec connection establishment
Power -- device dependent
–
–
–
Submission
Class 1 = Max 100mW (20dBm), Min 1mW (0dBm)
Class 2 = Max 2.5mW (4dBm), Min 0.25mW (-6dBm)
Class 3 = Max 1mW (0 dBm), recommend <-30dBm Min
Slide 3
Tom Siep, Cambridge Silicon Radio Plc
June 2005
doc.: IEEE 802.19-05/0018r0
Modulation characteristics
• The Modulation is GFSK (Gaussian Frequency Shift Keying) with
a bandwidth-bit period product BT=0.5. The Modulation index
shall be between 0.28 and 0.35. A binary one shall be represented
by a positive frequency deviation, and a binary zero shall be
represented by a negative frequency deviation.
Submission
Slide 4
Tom Siep, Cambridge Silicon Radio Plc
June 2005
doc.: IEEE 802.19-05/0018r0
Topology
• TDMA
• Single Master with up to
7 slaves forming an
independent piconet
• Piconets are able to
interact
Submission
Slide 5
Tom Siep, Cambridge Silicon Radio Plc
June 2005
doc.: IEEE 802.19-05/0018r0
Coexistence Characteristics
• Out of Band Noise Floor tolerance
Interfering Signal Frequency [Interfering Signal Power Level]
•
•
•
•
30 MHz –
2000
2484
3000 MHz
2000 MHz [-10 dBm]
–
2399 MHz [-27 dBm]
–
3000 MHz [-27 dBm]
–
12.75 GHz [-10 dBm]
• Coexistence mechanism
– Adaptive Frequency Hopping, which maps out error-prone channels
– Number of channels may be reduced from 79 down to as low as 20 and
are not required to be contiguous
– Detection method not specified, but typical implementations:
• Do not do Listen Before Talk (LBT)
• Are reactive/heuristic – presence of others in band is based on repeated errors
in specific channels
Submission
Slide 6
Tom Siep, Cambridge Silicon Radio Plc
June 2005
doc.: IEEE 802.19-05/0018r0
References
• IEEE 802.15.1-2005
Submission
Slide 7
Tom Siep, Cambridge Silicon Radio Plc