Internet DRAFT - draft-liu-wisun-use-cases
draft-liu-wisun-use-cases
lpwan B. Liu
Internet-Draft M. Zhang
Intended status: Informational Huawei Technologies
Expires: January 4, 2018 C. Perkins
Futurewei
July 3, 2017
WiSUN use cases
draft-liu-wisun-use-cases-00
Abstract
This draft presents several use cases in which WiSUN technology can
be applied, including Advanced Metering Infrastructure and
Intelligent Street Lights. The draft can stand alone as an
independent draft, but also represents a potential contribution to
the "WiSUN overview" section of [I-D.ietf-lpwan-overview].
Status of This Memo
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This Internet-Draft will expire on January 4, 2018.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.1. Advanced Metering Infrastructure . . . . . . . . . . . . 3
3.2. Intelligent Street Lights . . . . . . . . . . . . . . . . 4
4. Security Considerations . . . . . . . . . . . . . . . . . . . 5
5. References . . . . . . . . . . . . . . . . . . . . . . . . . 5
5.1. Normative References . . . . . . . . . . . . . . . . . . 5
5.2. Informative References . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
WiSUN [RFC2119] is an established suite of IoT technologies that is
based on IEEE 802.15.4, TCP/IP, and related standard protocols.
Important characteristics of WiSUN include the following:
Coverage
Range measured in kilometers
Development Ecosystem
WiSUN Alliance with task groups for targeted use cases and assured
interoperability
High Bandwidth
Up to 300 kbps
Low Latency
0.02 seconds
Mesh Routing
Resilient and scalable
Power Efficiency
less than 2 uA when resting; 8 mA when listening
Scalability
Networks to 5,000 devices; 10 million endpoints worldwide
Security
Public key certificates, AES, HMAC, dynamic key refresh, hardened
crypto
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2. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
[RFC2119]. Additionally, this document uses the following terms:
AMI
Advanced Metering Infrastructure
B-LLN
Building Automation LLN
CAN
Campus or Corporate Area Network
I-LLN
Industrial LLN
LLN
Low-power, lossy network
U-LLN
Urban LLN
WiSUN
Wireless Smart Utility Network
3. Use Cases
3.1. Advanced Metering Infrastructure
Advanced metering infrastructure (AMI) is an integrated system of
smart meters, communication networks and data management
applications. The coverage of Wi-SUN signal is typically 2~3 km,
matching the needs of neighborhood area networks, campus area
networks, or corporate area networks (CAN). AMI can use Wi-SUN as
the single technology to read various types of meters (electricity,
gas, water) within one network.
Besides the daily or monthly meter reading for bill charging,
customers also desire to have a more frequent meter reading to build
detailed consumption reports. For such scenarios, the sampling rate
of AMI can be once every 10 minutes or even more. Wi-SUN devices are
designed for frequent communications (as often as every 10 seconds),
satisfying AMI's requirement on sampling rate. Moreover, the MAC MTU
of 2047 bytes of Wi-SUN supports the aggregation of locally cached
samples into a single packet, which can then be uploaded far less
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often (e.g. daily). A battery-powered Wi-SUN device can last for up
to 10 years without needing battery replacement.
Wi-SUN's symmetric uplink/downlink capability and data rate (up to
300kbps) allow interactive communications between end devices and
gateways. Customers are able to read their meters and get a timely
response. When an outage occurs, the operator can interactively
"ping" each meter to verify its status, so that the trouble spots can
be diagnosed. For these two cases, the meters should respond in
real-time.
3.2. Intelligent Street Lights
Enabling Intelligent Street Lights is an important use for urban IoT.
Various end devices can be integrated in a single street light pole
for the purposes of adaptive lighting, environment monitoring,
utility management, advertising and so on.
Wi-SUN supports a high duty cycle enabling frequent data transmission
-- as often as once every 10 seconds. With Wi-SUN, sensors such as
temperature, humidity and air quality mounted on a light pole can
maintain a high sampling rate. Wi-SUN's large MTU (2047 bytes) also
allows data from different sensors to be packed within a single
packet.
As an example for utility management, in the current trash
collection, the sanitation workers have to pass by to check each
trash can periodically. Since the workers cannot tell whether a can
contains any trash, sometimes they come by only to find that the can
is empty. If sensors are deployed in the cans, the workers will be
informed before attempting collection. Given detailed information
about the quantity and type of trash , the right type of vehicle can
be sent for collection, and an efficient schedule and path can be
planned. Such on-demand collection can reduce the operations cost of
sanitation companies. The communication devices in the trash cans
would be powered by battery, and their life time should be long
enough to minimize the need for battery replacement. In order to
save energy, the device is activated only when needed; otherwise it
is in deep sleep mode. Battery powered Wi-SUN devices can last for
years due to low power consumption. The range of Wi-SUN can be 2~3km
in line of sight, so that a gateway mounted on a light pole would
cover the end-devices in a district area. If a physical obstruction
exists, the range can be extended by multi-hop connection between
mains powered Wi-SUN gateways.
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4. Security Considerations
Security is a core concern for many IoT/lpwan networks. Compromised
devices can be used to mount attacks on other networks, resulting in
disruption of essential services (as would be the case for critical
IoT networks used for public safety) or costly technology
replacements. Networks based on WiSUN can provide excellent security
by offering a number of standardized and powerful features such as
Public Key Infrastructure certificates, 802.11i, AES, HMAC, and
others as described in [citation required].
5. References
5.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<http://www.rfc-editor.org/info/rfc2119>.
5.2. Informative References
[I-D.ietf-lpwan-overview]
Farrell, S., "LPWAN Overview", draft-ietf-lpwan-
overview-05 (work in progress), July 2017.
Authors' Addresses
Bing Liu (Remy)
Huawei Technologies
No. 156 Beiqing Rd. Haidian District
Beijing 100095
China
Email: remy.liubing@huawei.com
Mingui Zhang
Huawei Technologies
No. 156 Beiqing Rd. Haidian District
Beijing 100095
China
Email: zhangmingui@huawei.com
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Charles E. Perkins
Futurewei
2330 Central Expressway
Santa Clara 95050
United States
Email: charliep@computer.org
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