802 15-4g-for-smart-utility-networks
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doc.: IEEE 802.15-09-0285- 00-004g Submiss ion May, 2009 Hatauchi, Fuji Electric Systems Slide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Networks (WPANs) Submission Title: [PHY and MAC Proposals for battery-operated SUN] Date Submitted: [2 May, 2009] Source: [Takaaki Hatauchi] Company [Fuji Electric Systems Co., Ltd.] Address [1, Fuji-machi, Hino-city, Tokyo 191-8502, Japan] Voice:[+81-42-586-8875], FAX: [+81-42-585-6035], E-Mail:[hatauchu- [email protected]] Re: [] Abstract: [MAC and PHY proposal for 802.15.4g for Smart Utility Networks] Purpose: [Presented to the IEEE 802.15.4g SUN task group for consideration] 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.
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Transcript of 802 15-4g-for-smart-utility-networks
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 1
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [PHY and MAC Proposals for battery-operated SUN]Date Submitted: [2 May, 2009]Source: [Takaaki Hatauchi] Company [Fuji Electric Systems Co., Ltd.]Address [1, Fuji-machi, Hino-city, Tokyo 191-8502, Japan]Voice:[+81-42-586-8875], FAX: [+81-42-585-6035], E-Mail:[[email protected]]
Re: []
Abstract: [MAC and PHY proposal for 802.15.4g for Smart Utility Networks]
Purpose: [Presented to the IEEE 802.15.4g SUN task group for consideration]
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.
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 2
PHY and MAC Proposalsfor battery-operated SUN
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 3
Contents• Metering System in Japan
– SUN Applications– System Concept – Requirements
• MAC Proposal– Preferable MAC– Principle of MAC Operation
• PHY Proposal– Frequency Band– Modulation– Other requirements
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 4
Metering System in Japan
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 5
SUN Applications
Gas, Water, Electric Metering
Remote Control
Sensor Monitoring and Alerting
Home Security
Door Locking
Fire Alarm
Home ApplianceControl Shutting Meter off
Gas, Water Leak
About 5 Million AMR devices already installed in Japan
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 6
System Concept
Networks in cluster housing
SUN
WAN
WANDevice
New Gas Meter:connected to SUN/WAN devices
SUNDevice
House to House Network
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 7
Layer Structure
MAC
Network
PHY (15.4)868MHz / 915MHz
PHY (15.4c)780MHz
PHY (15.4d)950MHz
PHYUnder 450MHz
Application
Amendment Proposals for IEEE802.15.4g
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 8
Requirements for SUN Applications• Communication Profiles
– variable packet size– one communication per hour or day
• Battery Operation– over 10 years without maintenance
• Reliable Communication– mesh network without hierarchical topology– auto-healing, auto alternate routing (route diversity)
• Low Interference– 100~1k devices are installed in a cluster housing
• Cost Effectiveness– license free band– easy installation with no or few configuration
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 9
• Hierarchical network is not preferable– Coordinator / Router consumes more power than end device
• often installed where no AC power is available– Malfunction / power outage of a coordinator results in
communication loss of all end devices below
Coordinatorrouter
router
router
router
AC power required
End deviceEnd device
End device
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 10
• Synchronous system is not preferable– Not suitable for low duty cycle system
• Tight requirement for crystal frequency• Increasing power consumption with off-the-shelf crystal
– Not suitable for multi-hop system• Synchronization error accumulates with number of hops
Synchronous to upper node
Intermittent node
Intermittent node
Intermittent node
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 11
MAC Proposals
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 12
Preferable MAC
• Support for low duty cycle• Occupation of wireless channel takes communication
opportunities for other wireless devices• Consuming as low power as possible
• Support for variable duty cycle depending on battery charge or power supply condition• Different devices have different power conditions and
requirements (lifetime, size of battery and so on)– Gateway, meter or sensor, etc.
• Support for nonhierarchical network• In hierarchical network, a single point of failure at a certain
node results in loss of link at neighboring nodes
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 13
Principle of operation
- All nodes are repeating ID transmission and short period reception, intermittently (1)
- When the transmission request is generated, set transmission destination and wait for ID reception (2)
- Upon reception of ID from transmission destination, transmit data to the receiver at succeeding reception mode (3)
- If failed, set different transmission destination and wait for ID
Sleep mode
(1)
Sleep modeWait for ID reception
ID transmission Short period reception mode
Active mode
ID transmission
(2)
Sender(having data to send)
Receiver(destination of data)
Transmit request
Data transmission
(3)
-> Low Duty Cycle
Intermittent Receiver-driven Data Transmission
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 14
Access between devices with different duty cycle
• Support for variable duty cycles– Devices with longer duty cycle have less chances to relay
packets, resulting less power consumption
Wait for ID receptionsender
Receiver A
Receiver BShorter duty cycle
Longer duty cycle
Transmit request
ID transmission
Data transmission
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 15
• Sample Listening system is not preferable – Waking up destination node by transmitting packet that is longer than the
duration of sleep mode• Wireless channel is occupied and cannot be used by other link
– Less efficient when neighboring nodes are operating with different duty cycles
Intermittent node
Intermittent node
Intermittent node
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 16
PHY Proposals
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 17
Frequency Band• IEEE802.15.4 Sub GHz Bands
– 868MHz, 915MHz (15.4)– 780MHz (15.4c)– 950MHz (15.4d)
• Additional Band– Under 450MHz in Japan
• Reallocation of Under 450MHz Band for SUN Applications is under consideration in Japan
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 18
Modulation• Requirement for SUN
– Power consumption is higher priority than sensitivity due to battery operation
• Desirable Modulation– FSK– GFSK
• It’s possible to minimize the power consumption
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 19
Other Requirements• Transmit Power
– within the limit of license exemption
• Data Rate (s)– 100kbps or higher
• In the case of Intermittent Receiver-driven Data Transmission, high data rates enables to shorten transmission time.
• It leads to reduction of power consumption and interference.
• Payload Length– Payload size has to be variable
• Duty Cycle Limitation– Up to 0.1% is preferred– Reduction of interference
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 20
Conclusion
• Overall requirement for SUN – Application under development in Japan is introduced– Battery operated, mesh network system
• MAC proposal– Intermittent Receiver-driven Data Transmission is proposed– Low and variable duty cycle, suitable for battery operation
• PHY proposal– Simple, narrowband modulation scheme, such as FSK /
GFSK are preferable for minimizing power consumption– Under 400MHz band is under consideration for frequency
band reallocation in Japan
doc.: IEEE 802.15-09-0285-00-004g
Submission
May, 2009
Hatauchi, Fuji Electric SystemsSlide 21
Thank you for your attention
Any Questions ?
