1. 平成30年11月
doc.: IEEE /424r1
March 2007
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: Delay of Japanese 950MHz Regulation
Date Submitted: March 13, 2007
Source: Shigeru Fukunaga, Oki Electric Industry Co., Ltd.
Contact: Shigeru Fukunaga, Oki Electric Industry Co., Ltd.
Voice: ;
Re: d-progress-japanese-950mhz-regulation
Abstract: Introduction of delay of Japanese 950 MHz regulation.
Purpose: To encourage discussion.
Notice: This document has been prepared to assist the IEEE P 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 P
Shigeru Fukunaga, OKI
Stuart J. Kerry - Philips Semiconductors, Inc.

2. Delay of Japanese 950MHz Regulation
March 2007
Delay of Japanese 950MHz Regulation
OKI
Shigeru Fukunaga, OKI

3. Abstract Delay of 950 MHz regulation in Japanese committee of MIC.
March 2007
Abstract
Delay of 950 MHz regulation in Japanese committee of MIC.
Schedule
Shigeru Fukunaga, OKI

4. Progress of MIC committee
March 2007
Progress of MIC committee
A draft of regulation was progressed just before being reported.
2 issues for high efficiency use are planed to be discussed continuously.
Short carrier sense for LR-WPAN
Channel allocation for sub carrier RFID system
However committee decided remained issues have to be included to the report, because of avoiding this year’s report might be the tentative regulation.
Shigeru Fukunaga, OKI

5. Discussing Regulation for LR-WPAN (1/3)
March 2007
Discussing Regulation for LR-WPAN (1/3)
Same to London meeting
Maximum power
1mW, 10mW
Frequency band
1mW: – MHz
10mW: – MHz
In Progress
1mW
10mW
Shigeru Fukunaga, OKI

6. Discussing Regulation for LR-WPAN (2/3)
March 2007
Discussing Regulation for LR-WPAN (2/3)
Same to London meeting
Signal bandwidth
Less than (200×n) kHz (n: number of unit channels, n=1,2,3)
Channel mask
In Progress
1mW
10mW
-39ｄBm/100kHz
-20dBm fc
-20dBc
200kHz
fc-200kHz
0dBm
-26dBm/200kHz
fc+200kHz
-39ｄBm/100kHz
-10dBm fc
-20dBc
200kHz
fc-200kHz
10dBm
-18dBm/200kHz
fc+200kHz
Shigeru Fukunaga, OKI

7. Discussing Regulation for LR-WPAN (3/3)
March 2007
Discussing Regulation for LR-WPAN (3/3)
Same to London meeting
Carrier sense level: -75dBm
Carrier sense time: 10ms
Transmission control
After sending less than 1s, it has to pose more than 100ms.
In Progress
Shigeru Fukunaga, OKI

8. Remained Issue #1 Short Carrier Sense for LR-WPAN (1/2)
March 2007
Remained Issue #1 Short Carrier Sense for LR-WPAN (1/2)
10ms carrier sense time is too long to consider low power consumption.
Problem #1: Short carrier sense increases the delay of RFID system.
Increased delay
Carrier Sense
RFID reader
Signal
10ms (for low power RFID system)
5ms (for high power RFID system)
LR-WPAN
Shigeru Fukunaga, OKI

9. Remained Issue #1 Short Carrier Sense for LR-WPAN (2/2)
March 2007
Remained Issue #1 Short Carrier Sense for LR-WPAN (2/2)
Problem #2: Short carrier sense causes some interference with tag’s responses.
Short break for switching antennas.
5ms
50ms 4s
RFID reader
Response
from tags
Interference
LR-WPAN
128us
About 10ms
Shigeru Fukunaga, OKI

10. Remained Issue #2 Sub Carrier RFID System (1/2)
March 2007
Remained Issue #2 Sub Carrier RFID System (1/2)
Base band system
Tag’s response returns on the
same channel to reader’s sending.
As tag’s response is much weaker
than reader’s signals, some readers
cannot send signals simultaneously.
Sub carrier system
Tag’s response returns on the
next channel to reader’s sending.
Tag’s response
Reader’s signal
As some readers can send signals
Simultaneously, it realizes more
efficiency.
Shigeru Fukunaga, OKI

11. Remained Issue #2 Sub Carrier RFID System (2/2)
March 2007
Remained Issue #2 Sub Carrier RFID System (2/2)
Problem: To realize the efficiency, exclusive channels have to be defined for both reader’s signals and tag’s response.
LA-WPAN cannot use the single tag’s channel to avoid interference.
Tag’s response only
reader’s signals only
Shigeru Fukunaga, OKI

12. March 2007
Schedule
Discussion is just postponed, and the schedule has not decided yet.
Shigeru Fukunaga, OKI

13. March 2007
Discussion
Is there any good idea to realize co-existent between sub carrier RFID and LR-WPAN?
Shigeru Fukunaga, OKI