Transcript 99037r1P802-15_NPRM

July 1999
doc.: IEEE 802.15 99037r1
FCC Spectrum Management Topics
NPRMs
WBFH + DS Processing Gain
Microwave Lighting
Submission
Slide 1
Bruce Kraemer, Harris Semiconductor
July 1999
doc.: IEEE 802.15 99037r1
Federal Communications Commission
NPRM: NOTICE OF PROPOSED RULE MAKING
Amendment of Regulations for Part 15 Spread Spectrum Devices
ET Docket No. 99-231
FCC 99-149
Released: June 24, 1999
Comment Date: [75 days after publication in the Federal Register]
Reply Comment Date: [105 days after publication in the Federal Register]
FCC proposes to amend the Part 15 Section 247 rules regarding the operation
of ISM spread spectrum systems.
Frequency hopping systems operating in the 2.4 GHz band (2400 - 2483.5
MHz) to allow for wider operational bandwidths.
Refine the method for measuring the processing gain of direct sequence
systems.
Goal: Facilitate development and deployment of spread spectrum
technology, particularly for high data rate wireless applications.
Submission
Slide 2
Bruce Kraemer, Harris Semiconductor
July 1999
doc.: IEEE 802.15 99037r1
Summary of WBFH Proposals
Power
(dBm)
Power
(W)
Channel
(MHz @
-20dB)
Frequencies
Used
Max Dwell
Per hop
(ms)
Dwell per 30
sec
(ms)
Now
Proposed
Proposed
Proposed
30
30
25
23
1
1
0.32
0.20
1
1
3
5
75
75
75
75
400
400
50
20
400
400
400
400
Now
5.725-5.850
Proposed
5.725-5.850
30
1
1
75
400
400
30
1
1
75
400
400
Submission
Slide 3
Bruce Kraemer, Harris Semiconductor
July 1999
doc.: IEEE 802.15 99037r1
DS Processing Gain
Processing gain (PG) shall be > 10dB
PG = improvement in SNR after filtering from coding and spreading
Today: PG (dB) = SNR with spread on
SNR with spread off
Proposed Methods:
No changes If chip rate > 10 chips/symbol
If chip rate < 10 chips/symbol
Traditional CW jammer test
AND
Mathematical calculation of processing gain
OR
Jamming margin test using Guassian Noise
Submission
Slide 4
Bruce Kraemer, Harris Semiconductor
July 1999
doc.: IEEE 802.15 99037r1
FCC Invites Comments:
(9) FCC does not believe new rules will result in any significant increase in interference to
direct sequence spread spectrum systems.
WBFH interference on DSSS
DSSS can compensate by improving processing gain
WBFH interference to Amateur Radio
(10) FCC believes that WBFH systems will achieve data rates substantially greater than 1
MHz systems.
Effects of multipath interference and subsequent retransmissions
(14) The current jamming margin test is based on use of a CW signal as an interference
source but propose to use a Guassian interferer.
Effect of using a Guassian interferer in the current jamming margin test set-up and
detailed measurement procedures.
(15) FCC proposes that results of jamming margin test be submitted along with a
mathematical calculation of processing gain, if the DS system uses fewer than 10 chips per
symbol.
Requirements to submit the results of the jamming margin test as well as a
calculation of processing gain to verify compliance.
Submission
Slide 5
Bruce Kraemer, Harris Semiconductor
July 1999
doc.: IEEE 802.15 99037r1
Motion 1
Form a 802.11 WBFH study group (liaison with 802.15)
Analyze interference impact on legacy 802.11 systems
Report findings/recommendations to 802.11 by Wednesday
Suggest further actions
Motion 2
Form a 802.11 DS Processing Gain study group (liaison with 802.15)
Fully understand rule changes
Define Gaussian noise source
Report findings/recommendations to 802.11 by Wednesday
Suggest further actions
Submission
Slide 6
Bruce Kraemer, Harris Semiconductor
July 1999
doc.: IEEE 802.15 99037r1
Tuesday Evening Summary
Agreed:
Prefer non-overlapping channels
CCA is better with non-overlapping channels
Faster hopping doesn’t reduce interference – the contrary ...
Should we oppose WBFH, as defined in the NPRM?
Yes 13
No 1
Abstain 4
Should we support WBFH with modifications proposed by 802.11?
Yes 2
No 13 Abstain 4
Study group to draft a letter on behalf of 802.11 in opposition of WBFH
as defined in NPRM 99-231. This document after approval of 802.11
plenary will be forwarded to ExCom for approval for release to FCC.
15-1-2
Submission
Slide 7
Bruce Kraemer, Harris Semiconductor
July 1999
doc.: IEEE 802.15 99037r1
NPRM 98-42
• Recommended authorization of RF Lights
operating in 2.45 GHz ISM band
– NO LIMIT on in-band emissions!
– Only FDA limits on human exposure apply
– Final OET recommendation sent to Commission in
December, 1998
• Part 15 Interests appealed directly to Commission
– Commission delayed final resolution pending efforts of
interested parties to seek resolution
Submission
Slide 8
Bruce Kraemer, Harris Semiconductor
July 1999
doc.: IEEE 802.15 99037r1
Latest Proposal (July 99)
2460 - 2480 MHz
100 dBmV/m
@ 10 m
III
II
I
60 dBmV/m
@3m
2460
MHz
2400
MHz
2480
MHz
2500
MHz
Region I :
2400 - 2460 MHz. RF lighting restricted to 1 mV/m (avg)
Region II :
2460 - 2480 MHz. RF Light emission limit of 100 dBmV/m @ 10 m
(equivalent to 330 mVm @ 3m). Consistent with CISPR15 limits.
Region III : 2480 - 2500 MHz.
RF lighting restricted to 1 mV/m (avg)
This portion of the band includes satellite services.
Submission
Slide 9
Bruce Kraemer, Harris Semiconductor