Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

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Project IEEE P802.15 Working Group for Wireless
Personal Area Networks (WPANs) Submission Title
TG5 CFA Response Applications for the Mesh
Networks Date Submitted 01 July,
2004 Source ISHIKAWA Chiaki and OKUMA
Yasuyuki Company YRP Ubiquitous Networking
Laboratory Address 2-20-1 Nishigotanda,
Shinagawa, Tokyo, 141-0031, Japan Voice81-3-54
37-2270, FAX [phone],
E-Mailishikawa_at_ubin.jp, kuma_at_ubin.jp Re
Response to IEEE P802.15.TG5 Call For
Applications, Document number 15-04-0267-00-0005
Abstract Applications for the Mesh
Networks Purpose Use as one of the sets of
criteria for establishing the Mesh
Networks 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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TG5 CFA Response Applications for Mesh Network

• ISHIKAWA Chiaki
• OKUMA Yasuyuki
• YRP Ubiquitous Networking Laboratory

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Why MESH network is needed ? (1/2)

• CFA mentions and defines full and partial MESH
  topology and we use the definition to explain our
  rational below.
• In view of the applications mentioned in the
  following, we observe that the device node for
  human-machine interaction (HMI) is best placed at
  the root of device node tree for a centralized
  control system. Such a node with HMI accepts
  human input and the control message flows from it
  through the tree-like partial mesh topology
  network. Also, the control message from such
  centralized controller reach the controlled node
  directly. (In this sense, this is more like
  star-topology, but generally speaking, we can
  have devices that can only be reached by means of
  hop device, e.g. across a corner wall, so general
  tree-like topology is definitely required.) Thus
  the controller is at the root of the tree and in
  this sense we use partial mesh, which is tree.

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Why MESH network is needed ? (2/2)

• Even in such centralized control system that uses
  tree-like topology for human-initiated control
  message flow, actuator devices and sensors within
  communication distance (in close proximity)
  should communicate with each other using full
  mesh topology so that we can attain optimum
  control of the whole system by allowing the local
  optimization among autonomous nodes.
• For example, the medical support system mentioned
  in the following also can be best served by full
  MESH topology communication among nodes in close
  proximity and this is also the requirement from
  the application (emergency conditions of patients
  need to alerted to medical staff close by).
• When aggregates of nodes under control are merged
  or divided, we need to consider the creation of
  meta-MESH that consists of element subnetworks.
  (e.g. The hotel conference hall example in the
  following.).
• Thus, the typical applications we consider do use
  and need MESH. As a matter of fact, we think that
  aside from the very simple sensor networks, any
  complex application networks that will be part of
  legacy application systems are highly like to
  require/use MESH topology.

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Environment Control( Home control Hall control)

• The environment control system considered here
  uses wireless personal controller which manages
  the device nodes embedded in lighting fixtures,
  air-conditioners, TVs, audio visual equipment,
  door locks, windows, etc..
• Here we distinguish two cases based on the size
  of the rooms which are controlled. .
• A small-scale system (e.g. home, etc.)
• A large-scale system (e.g. school, office,
  ball rooms and conference rooms at hotels, etc.)
• In the latter scenario, the size of room is
  generally large. Also, we assume that the larger
  hall (conference room room) is reconstructed from
  small halls (conference rooms) by changing
  partitions.

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Security System

• The information from the various wireless sensor
  installed in a house or office is used, by the
  existence and whereabout (location) of the
  persons, the level of security is changed
  automatically. Accident or a intrusion by
  suspicious person is prevented, and safety is
  secured.

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Medical support

• Sensors are used to monitor patient health
  conditions continuously. Doctors and nurses
  carry wireless terminals. These sensors and
  monitoring terminals are connected via wireless
  mesh network, and thus the patient information is
  shared among medical staff, thus resulting in
  safe and reliable medical care.
• We can avoid the initial cost of communication
  infrastructure by using wireless mesh network for
  movable instruments, fixed-location medical
  instruments, instruments attached to patients'
  beds, and terminals carried by medical staff
  members.
• We need to use secure communication (e.g.
  encrypted communication) so that the patient
  information is available only to the authorized
  personnel only even when we use multi-hop
  communication paths. We need to protect the
  control message in a similar manner.
• (Figure NEXT PAGE.)

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Medical support
patient
Doctor / Nurse Monitor
instrument
patient sensor
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Factory Assembly Line Monitoring and Control

• We mention this application in passing, since
  this is actually very similar to medical support
  system mentioned in the preceding pages although
  superficially they look very different.
• We replace the legacy monitoring and controlling
  of factory assembly line based on wire with a
  wireless system.
• The merit of such system is the flexibility to
  cope with the assembly line layout.
• Movable monitoring stations, fixed-location
  machines, terminals carried by assembly line
  works and managers are all connected into MESH
  network.
• Use of wireless communication brings about
  flexibility and avoids the initial layout of wire
  networks.
• As in the medical support system application
  example, secure communication channel must be
  used to protect the sensivitve monitoring
  information and control message.

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Required Feature Comparison.
11
Required Feature Comparison. (contd)
12
Required Feature Comparison. (contd)

• 4 the change of hall configuration by means of
  rearranging partition wall/curtain ought to be
  easy since this is handled by hotel personnel.
• 5 Halls may require longer distance, say, than
  home control system.
• 6 Considering the potential interference with
  medical gears, the power consumption / emission
  should be small!
• 7 for medical and factory use, the monitoring
  and control requires frequent data exchange.
• 8 control systems on the left column may be
  relatively simple. Medical support and factory
  control may require complex control and
  monitoring.
• 9 we don't want random stranger walking
  close-by to turn on/off devices randomly.
• 10 we now have added privacy issues concerning
  monitored data.
• 11 All these control application requires that
  they are available when needed. In medical
  application, it is a life-and-death issue.
• 12 In the control applications, the control
  message is likely to be distributed in a
  tree-like fashion. However, the sensor data are
  likely to be exchanged locally in a full mesh
  fashion.
• 13 sensor data is likely to be propagated to
  nearby doctors in a full mesh fashion. Comment
  11 also applies.
• 14 WAN connection may be convenient, but it is
  not desirable due to security reasons.
• 15halls/ conference rooms are re-partitioned
  occasionally.
• 16 pieces of equipment are moved to bedside or
  to operation rooms, and doctors carry controllers.