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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.
Delay of Japanese 950MHz Regulation
March 2007 Delay of Japanese 950MHz Regulation OKI Shigeru Fukunaga, OKI
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
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
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
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
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
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
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
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
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
March 2007 Schedule Discussion is just postponed, and the schedule has not decided yet. Shigeru Fukunaga, OKI
March 2007 Discussion Is there any good idea to realize co-existent between sub carrier RFID and LR-WPAN? Shigeru Fukunaga, OKI
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