Transcript - IEEE Mentor

Sept 2010
doc.: IEEE 802.15-10-0802-00-0006 .
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title:
Draft Proposal for correction to IEEE 802.15.6 MICS/MedRadio band to support
world-wide regulatory changes in this band (to be formally submitted during sponsor ballot)
Date Submitted:
16 - Sep, 2010
Source: Peter Bradley, Zarlink Semiconductor
Future sponsor ballot comment – support for complete MedRadio to align with current worldwide regulations
Re:
Abstract: This document proposes corrections for the Narrowband PHY section due to worldwide
regulatory changes that support expansion of the core MICS band (402-405 MHz) to a new
band termed MedRadio Band from (401-406) MHz.
Purpose: For discussion by IEEE 802.15 TG6
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.
Submission
Slide 1
Peter Bradley, Zarlink Semiconductor
Sept 2010
doc.: IEEE 802.15-10-0802-00-0006 .
MICS/MedRadio Issue
•
Regulatory inconsistency issue:
– The FCC established in Mar-2009 the MedRadio Service as documented in FCC
Report and Order FCC-09-23.
–
“By this Report and Order, we establish a new Medical Device Radiocommunication Service (MedRadio Service) under Part 95 of the
Commission’s rules.1 This new service incorporates the existing Medical Implant Communications Service (MICS) “core” band at 402-405 MHz,
and also includes two megahertz of newly designated spectrum in the adjacent “wing” bands at 401-402 MHz and 405-406 MHz. Altogether, the
MedRadio Service will provide a total of five megahertz of contiguous spectrum on a secondary basis and non-interference basis for advanced
wireless medical radiocommunication devices used for diagnostic and therapeutic purposes in humans. The MedRadio Service will accommodate the
operation of body-worn as well as implanted medical devices, including those using either listen-before-talk (“LBT”) frequency monitoring or nonLBT spectrum access methods, in designated portions of the 401-406 MHz band”
– Similar approval of the MedRadio Service has occurred in Europe and
internationally
– IEEE 802.15.6 band definitions and channel requirements reference the original
core MICS band only and should be updated to conform fully to current regulations
– This is a significant oversight that should be corrected to enable successful
implementation of 802.15.6 in medical implant and external sensor applications.
– The use of 802.15.6 compliant third-party external sensors or therapeutic devices
networked to medical implants using MedRadio may be considered one of the
stronger cases for implementing an interoperable system within a medical implant
system.
•
Proposed Resolution to Issue:
– Modifications as documented in attached slides.
Submission
Slide 2
Peter Bradley, Zarlink Semiconductor
Sept 2010
Submission
doc.: IEEE 802.15-10-0802-00-0006 .
Slide 3
Peter Bradley, Zarlink Semiconductor
Sept 2010
doc.: IEEE 802.15-10-0802-00-0006 .
About MedRadio
• Expansion of core MICS band (402-405 MHz) by adding 1 MHz
“wing” bands 401-402 MHz and 405-406 MHz
– May be used by implanted or medical body worn device
– 20 x 100 KHz channels
• Industry saw a need for additional spectrum for medical devices (both
implant and body-worn) and filed a petition for rulemaking with the
FCC in July 2005 requesting additional spectrum
• Granted in March 2009 by FCC report and order FCC-09-23 with
significant industry support
• Follows earlier standardization in Europe (ETSI) and elsewhere so that
MedRadio is now essentially internationally harmonized.
Submission
Slide 4
Peter Bradley, Zarlink Semiconductor
Sept 2010
doc.: IEEE 802.15-10-0802-00-0006 .
MedRadio Benefits
•
•
MedRadio provides 2 key additional benefits over the core MICS
1) More channels for Implants systems
– An additional 20x100 kHz channels may be used for implants
– Similar LBT rules as for the core MICS 300 kHz channels
– Future implant systems will want access to this additional spectrum
•
2) Supports medical body-worn systems
– Simplified external node that can communicate using a single band to both
implants and external devices
– Useful for external sensors, control systems, therapy devices (e.g. implantable
blood glucose sensor with external pump system,
– Future medical body-worn systems will want access to this additional spectrum
•
Successful uptake of 802.15.6 within implant and body-worn systems
operating in the region 401-406 MHz will require that 802.15.6 fully
support the spectrum available with MedRadio.
Submission
Slide 5
Peter Bradley, Zarlink Semiconductor
Sept 2010
doc.: IEEE 802.15-10-0802-00-0006 .
MedRadio Benefits
•
From FCC report and order:
– “This additional spectrum is urgently needed due to
the increasing numbers and types of devices used for
an ever-increasing array of diagnostic and
therapeutic purposes. Indeed, no commenter
opposed designating this additional spectrum in the
wing bands for these purposes.”
– “we believe that the additional spectrum and
enhanced flexibility afforded in the new rules will
promote the accelerated development of newer
generations of advanced medical device
technologies. These advances, in turn, will herald
dramatic improvements in therapeutic/diagnostic
patient care and quality of life for countless
individuals”
Submission
Slide 6
Peter Bradley, Zarlink Semiconductor
Sept 2010
doc.: IEEE 802.15-10-0802-00-0006 .
MedRadio Permissible Communications
•
Similar requirements as MICS –
– under direction of health care professional
– Non-voice data
•
•
•
FCC§ 95.1209 Permissible communications.
(a) Except for the purposes of testing and for demonstrations to health care
professionals, MedRadio programmer/control transmitters may transmit only
non-voice data containing operational, diagnostic and therapeutic information
associated with a medical implant device or medical body-worn device that
has been implanted or placed on the person by or under the direction of a duly
authorized health care professional.
“The term “duly authorized health care professional” means a physician or
other individual authorized under state or federal law to provide health care
services. Operations that comply with the requirements of this part may be
conducted under manual or automatic control.”
Medical body-worn device. Apparatus that is placed on or in close proximity to
the human body (e.g.,within a few centimeters) for the purpose of performing
diagnostic or therapeutic functions.
Submission
Slide 7
Peter Bradley, Zarlink Semiconductor
Sept 2010
doc.: IEEE 802.15-10-0802-00-0006 .
MICS/MedRadio Change Discussion
•
•
Most of the changes to IEEE 802.15.6 are based on a simple scaling from 300
kHz MICS core channels to 100 kHz wing channels.
Use identical methods as previously employed to derive sensitivity, ACPR etc
Submission
Slide 8
Peter Bradley, Zarlink Semiconductor
Sept 2010
doc.: IEEE 802.15-10-0802-00-0006 .
Proposed Channelization
• Additional 18 channels x 100 kHz channels
• Guardbanding for tx emission regulatory requirements
– ETSI - MICS into MEDS
– FCC - mobile satellite 406-406.1 MHz
MedRadio Channelization
(401-406 MHz)
9 x 100 kHz channels
0 1 2 3 4 5 6 7 8
25 kHz
Guardband
401-402
MHz
10 x 300 kHz channels
0
1
75 kHz
Guardband
2
3
4
5
402-405
MHz
9 x 100 kHz channels
6
7
8
9
75 kHz
Guardband
9 1011121314151617
405-406
MHz
25 kHz
Guardband
MedRadio
Submission
Slide 9
Peter Bradley, Zarlink Semiconductor
Sept 2010
doc.: IEEE 802.15-10-0802-00-0006 .
Band and Channel Modifications
•
Proposed Modification
– Add (401-402 and 405-406) to introduction section 9
• “A compliant device shall be able to support transmission and reception in one of the
following frequency bands: (401-402 and 405-406) MHz, 402 – 405 MHz, 420 – 450 MHz,
863 – 870 MHz, 902 – 928 MHz, 950 – 956 MHz, 2360 – 2400 5 MHz and 2400 – 2483.5
MHz.”
– Add (401-402 and 405-406) MHz to beginning of list in section 9.5.1
– Add row to Table 42, to define channel numbering
• 401-402,405-406
fc=401.075+0.05 x g1(nc)(MHz), nc=0,…,19
0  nc  8
 2 nc
g1 (nc )  
2nc  63 9  nc  17
•
Discussion
–
–
–
–
–
Submission
The band and channel plan supports devices falling into several categories
(a) Implant systems with support for core MICS band (402-405) MHz
(b) Implant systems with support for wing bands (401-402 and 405-406) MHz
(c) Implant systems with support for both core MICS and wing bands
(d) Body-worn devices with support for wing bands
Slide 10
Peter Bradley, Zarlink Semiconductor
Sept 2010
doc.: IEEE 802.15-10-0802-00-0006 .
Data Rate Considerations
•
Data Rate Selection considerations
– Ideally scale MICS data rate by factor of 3 corresponding to BW ratio = 187.5/3=
62.5 kbps
– Low data rate limits
• Frequency offset should not be very much greater than 25% of symbol rate
Freq Tolerance
Carrier F
Frequency offset
Symbol Rate
F offset/Symbol Rate
Data Rate 1
40 ppm
406 MHz
16.24 kHz
62.5 ksps
26%
Data Rate 2
40 ppm
406 MHz
16.24 kHz
46.875 ksps
35%
• Too low a data rate increases packet length which is undesirable
– High data rate limits
• Maximum for reasonable spectrum usage is 62.5 kbps consistent with other bands
– Clock generation
• 62.5 ksps is simple translation by a factor of 3from the 187500 kbps used for MICS
• Same available clocks for sampling (2,4,8,16 samples/symbol)
• Other alternatives are 50 ksps and 46.875 ksps but these may be problematic for large
frequency offsets
Submission
Slide 11
Peter Bradley, Zarlink Semiconductor
Sept 2010
doc.: IEEE 802.15-10-0802-00-0006 .
Data Rate Modifications
• Proposed Modification:
– Add new section 9.1.1 401-402 and 405-406 MHz
• Add new table in this section which is a copy of table 26 except for
– Symbol rate changed from 187.5 to 62.5
– All information data rates reduced by a factor of 3
– Add column to Table 36 with first 4 rows filled by 25.3, 50.6, 101.2 and
151.8 and next 4 rows are “Reserved”, Column header is “(401-402 and
405-406) MHz”
– Consideration for dropping the spreading factor of 2 is under review
Symbol Rate
(ksps)
Code Rate
(k,n)
Spreading
Factor
Packet Component
Modulation
PLCP Header
π/2-DBPSK
62.5
19/31*
2
SRRC
19.2
Mandatory
PSDU
π/2-DBPSK
62.5
51/63
2
SRRC
25.3
Mandatory
PSDU
π/2-DBPSK
62.5
51/63
1
SRRC
50.6
Mandatory
PSDU
π/4-DQPSK
62.5
51/63
1
SRRC
101.2
Mandatory
PSDU
π/8-D8PSK
62.5
51/63
1
SRRC
151.8
Optional
Submission
Slide 12
Pulse Shape
Information
Data Rate
(kbps)
Support
Peter Bradley, Zarlink Semiconductor
Sept 2010
doc.: IEEE 802.15-10-0802-00-0006 .
Transmit BW, Power and ACPR
Modifications
• (THIS SECTION IS STILL UNDER REVIEW)
• Proposed Modification
– ‘Add row to table 46 for channel bandwidth specification
• “401-402 and 405-406
-20
100 kHz”
– Modify first sentence of section 9.7.2 Transmit Power
• “A transmitter shall be capable of transmitting at least –10 dBm EIRP in all
frequency bands, except for 401 – 406 MHz, where a transmitter shall be
capable of transmitting at most –16 dBm EIRP”
– Add row to table 48,
• “401-402,405-406” with -26 dB for node and -32 dB for hub
• Discussion
– Since implants may use the wing-bands we apply the same ACPR
requirements as per the core MICS.
Submission
Slide 13
Peter Bradley, Zarlink Semiconductor
Sept 2010
doc.: IEEE 802.15-10-0802-00-0006 .
Receiver Sensitivity Modifications
•
Proposed Modification
– Add rows to table 49 as follows:
Frequency Band
(MHz)
•
Information
Data Rate
(kbps)
Minimum Sensitivity
(dB)
401-402 and
25.3
-102
405-406
50.6
-99
101.2
-96
151.8
-90
Discussion:
– Expected improvement in sensitivity by going from 300 kHz for MICS to 100
kHz channel is 4.7 dB, Round down to 4 dB delta from the 402-405 MHz
Submission
Slide 14
Peter Bradley, Zarlink Semiconductor
Sept 2010
doc.: IEEE 802.15-10-0802-00-0006 .
Adjacent Channel Rejection
Modifications
•
Proposed Modification
– Add 401-402 and 405-406 to first row of table 50 (cell currently containing 402-405)
•
Discussion
– ACR calculated as per previous calculations:
• ACR was previously determined by combination of (i) phase noise limited reciprocal mixing
assuming a phase noise of -85 dBc/Hz at fc+fbw and (ii) a fixed term for ACPR, other noise
sources
pn / 10
os / 10
ACR  (10 Log10 (10
 10
)  3  SNR
Other sources component : os  26 dBc
Phase noise component :
pn  10 Log10 ( f sr )  n
where n  - 85 dBc/Hz is phase noise at fc  fbw
f sr  bw of signal approximat ed by symbol rate
SNR values are 5,8,12,17 dB for each rate respective ly
• When compared with core MICS, the phase noise for 100 kHz wing band channels may
increase; assuming a 20dB/decade phase noise profile the phase noise could potentially
increase from -85 dBc/Hz to -75 dBc/Hz from 300 kHz to 100 kHz. This does appear like a lax
phase noise specification.
• If we assume -80 dBc/Hz then the calculated ACR is identical to the core MICS. So
recommend this approach
Submission
Slide 15
Peter Bradley, Zarlink Semiconductor