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802.15.5 MESH
TOPOLOGY
Y SUNIL RAJ KUMAR
MTECH ECE,
REG NO 14043029
DEPT OF ELECTRONICS ENGINEERING,
PONDICHERRY UNIVERSITY
Goal of mesh topology
• The purpose of developing IEEE 802.15.5 is
to “provide the architectural framework
enabling WPAN devices to promote
interoperable, stable, and scalable
wireless mesh topologies and, if needed,
to provide the amendment text to the
current WPAN standards that is required
to implement this recommended
practice.”
11/04/15
Dept of electronics engineering,
Pondicherry University
2
FEATURES
• Easier network configuration,
• Node discovery,
• Multicast,
• Reliable broadcast,
• Synchronized and unsynchronized operations,
• Power saving (ON/OFF scheduling strategy)
route tracing.
11/04/15
Dept of electronics engineering,
Pondicherry University
3
11/04/15
Dept of electronics engineering,
Pondicherry University
4
TERMS DESCRIPTIONS
• Mesh coordinator: An entity that
manages the mesh network. It refers to
the root of the logical tree of a mesh
network whose tree level equals zero.
• Coordinator: A device that is capable of
relaying data frames for other devices.
• End device: A device that is not capable
of relaying data frames for other devices.
11/04/15
Dept of electronics engineering,
Pondicherry University
5
Mesh frame format
OCTAETS 12
MESH FRAME PAYLOAD MESH HEADER
11/04/15
Dept of electronics engineering,
Pondicherry University
6
1 2 1 1 2 2 2 1
TTL MESH
SEQUUEN
CE
NUMBER
DESTI
NATIO
N ID
SOURCE
ID
DESTIN
ATION
TREEID
SOURCE
TREEID
MESH
ID
MESH
FRAME
CONTROL
MESH HEADER
OPERATIONAL OVERVIEW
11/04/15
Dept of electronics engineering,
Pondicherry University
7
802.15.5
Low-rate WPAN
mesh
High-rate WPAN
mesh
HIGH RATE MESH OVER
802.15.3B MAC
LOW RATE MESH OVER
802.15.4 MAC
11/04/15
Dept of electronics engineering,
Pondicherry University
8
Challenges of LR WPAN Mesh
• Reliable
• Large Scale
• Low Duty Cycle
• Resource Limited
• Mostly Battery-Powered
• Simplicity yet Robustness
• Self-Configuration and Self-Healing
11/04/15
Dept of electronics engineering,
Pondicherry University
9
11/04/15
Dept of electronics engineering,
Pondicherry University
10
The reference model for low-rate WPAN mesh
Tree Formation and Addressing
In a LR-WPAN mesh network, a tree
is formed for both addressing and
routing purposes.
• Adaptive Tree (AT)
a. Initialization Phase
b. Operation Phase
• Meshed Adaptive Tree (MAT)
11/04/15
Dept of electronics engineering,
Pondicherry University
11
Adaptive Tree Formation
Initialization Phase
• Stage 1: Association
• Stage 2: Reporting number of
children
• Stage 3: Address assignment
a. An AT is formed.
b. Additional addresses can be
reserved
11/04/15
Dept of electronics engineering,
Pondicherry University
12
Adaptive Tree Formation
Operation Phase
• Normal data transmissions
i.Look at the address blocks for the
destination address and route the
packet accordingly.
ii.If not found, route through
parent
• Nodes are still allowed to join the
network
11/04/15
Dept of electronics engineering,
Pondicherry University
13
Meshed AT Formation
• Neighbors treat each other as a
child.
• Advantages
I. Shorter paths
II.Elimination of SPOFs
11/04/15
Dept of electronics engineering,
Pondicherry University
14
Unicast Routing
• Meshed Adaptive Tree
I.Provides the basic functions of routing.
II.Immediately available after MAT is
formed.
• Distributed Link State
I.More efficient routing can be achieved.
II.Requires exchange of neighbor
information.
III.Note global link state information is
NOT needed
11/04/15
Dept of electronics engineering,
Pondicherry University
15
Unicast Routing –Summary
• Simplicity
I.No route discovery.
II.No route repair.
• Adaptive Address Assignment (AAA)
I.avoiding “running out of addresses”
problem.
11/04/15
Dept of electronics engineering,
Pondicherry University
16
• Meshed AT (MAT)
i.shorter path.
ii.Robustness.
• Distributed Link State
i.Scalability
ii.multiple paths
iii. robustness
iv.shorter path
11/04/15
Dept of electronics engineering,
Pondicherry University
17
Multicast Routing
• This multicast routing proposal is based on the
Adaptive Tree protocol for the unicast routing.
• The Adaptive Tree (AT) algorithm constructs a
shared tree which spans all the nodes in a WPAN
mesh network.
• Our goal is to find a minimum sub-tree of the
Adaptive Tree which covers all multicast
members within each multicast group.
11/04/15
Dept of electronics engineering,
Pondicherry University
18
IEEE 802.15.5-HR
• Layer architecture.
• Network architecture.
• Super frame architecture Single.
11/04/15
Dept of electronics engineering,
Pondicherry University
19
11/04/15
Dept of electronics engineering,
Pondicherry University
20
The reference model for high-rate WPAN
mesh
11/04/15
Dept of electronics engineering,
Pondicherry University
21
High Rate Mesh Service Support WPS
• Network Setup
• Tree Topology Discovery
• ID Assignment
• Neighborhood-based Wireless Path
Selection
• Tree-based Wireless Path Selection
• Centralized Wireless Path Selection
11/04/15
Dept of electronics engineering,
Pondicherry University
22
Network Setup
• Mesh Coordinator (MC)
initializes the mesh
network
• Regularly announces mesh
capability in its beacon
• New MPN Cs scan for
beacons
• MPNCs choose free time to
send beacons
11/04/15
Dept of electronics engineering,
Pondicherry University
23
Tree Topology Discovery
11/04/15 Dept of electronics engineering,
Pondicherry University
24
• Each Mesh Pico net Controller
(MPNC)belonging to the tree
i.Waits for descendant report(s) from
its children.
ii.Estimates the number of own
descendants.
iii.Reports number of descendants to
parent.
• Process is repeated upon
i.Topology discovery request from MC
ID Assignment
• After receiving topology update
frames from all children
i.MC reserves a block of IDs.
ii.Assigns intervals of IDs to children.
iii.Size of interval is proportional to
reported number of children.
• MPNC receives an ID block.
• MPNC assigns ID to himself and its
DEVs
11/04/15
Dept of electronics engineering,
Pondicherry University
25
APPLICATIONS
Multimedia home network
11/04/15
Dept of electronics engineering,
Pondicherry University
26
Interconnection among PC and
peripherals
11/04/15
Dept of electronics engineering,
Pondicherry University
27
• Interconnection among handheld devices
• Automation and Control
• Etc….
11/04/15
Dept of electronics engineering,
Pondicherry University
28
11/04/15
Dept of electronics engineering,
Pondicherry University
29

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802.15.5 mesh topology

  • 1. 802.15.5 MESH TOPOLOGY Y SUNIL RAJ KUMAR MTECH ECE, REG NO 14043029 DEPT OF ELECTRONICS ENGINEERING, PONDICHERRY UNIVERSITY
  • 2. Goal of mesh topology • The purpose of developing IEEE 802.15.5 is to “provide the architectural framework enabling WPAN devices to promote interoperable, stable, and scalable wireless mesh topologies and, if needed, to provide the amendment text to the current WPAN standards that is required to implement this recommended practice.” 11/04/15 Dept of electronics engineering, Pondicherry University 2
  • 3. FEATURES • Easier network configuration, • Node discovery, • Multicast, • Reliable broadcast, • Synchronized and unsynchronized operations, • Power saving (ON/OFF scheduling strategy) route tracing. 11/04/15 Dept of electronics engineering, Pondicherry University 3
  • 4. 11/04/15 Dept of electronics engineering, Pondicherry University 4
  • 5. TERMS DESCRIPTIONS • Mesh coordinator: An entity that manages the mesh network. It refers to the root of the logical tree of a mesh network whose tree level equals zero. • Coordinator: A device that is capable of relaying data frames for other devices. • End device: A device that is not capable of relaying data frames for other devices. 11/04/15 Dept of electronics engineering, Pondicherry University 5
  • 6. Mesh frame format OCTAETS 12 MESH FRAME PAYLOAD MESH HEADER 11/04/15 Dept of electronics engineering, Pondicherry University 6 1 2 1 1 2 2 2 1 TTL MESH SEQUUEN CE NUMBER DESTI NATIO N ID SOURCE ID DESTIN ATION TREEID SOURCE TREEID MESH ID MESH FRAME CONTROL MESH HEADER
  • 7. OPERATIONAL OVERVIEW 11/04/15 Dept of electronics engineering, Pondicherry University 7 802.15.5 Low-rate WPAN mesh High-rate WPAN mesh
  • 8. HIGH RATE MESH OVER 802.15.3B MAC LOW RATE MESH OVER 802.15.4 MAC 11/04/15 Dept of electronics engineering, Pondicherry University 8
  • 9. Challenges of LR WPAN Mesh • Reliable • Large Scale • Low Duty Cycle • Resource Limited • Mostly Battery-Powered • Simplicity yet Robustness • Self-Configuration and Self-Healing 11/04/15 Dept of electronics engineering, Pondicherry University 9
  • 10. 11/04/15 Dept of electronics engineering, Pondicherry University 10 The reference model for low-rate WPAN mesh
  • 11. Tree Formation and Addressing In a LR-WPAN mesh network, a tree is formed for both addressing and routing purposes. • Adaptive Tree (AT) a. Initialization Phase b. Operation Phase • Meshed Adaptive Tree (MAT) 11/04/15 Dept of electronics engineering, Pondicherry University 11
  • 12. Adaptive Tree Formation Initialization Phase • Stage 1: Association • Stage 2: Reporting number of children • Stage 3: Address assignment a. An AT is formed. b. Additional addresses can be reserved 11/04/15 Dept of electronics engineering, Pondicherry University 12
  • 13. Adaptive Tree Formation Operation Phase • Normal data transmissions i.Look at the address blocks for the destination address and route the packet accordingly. ii.If not found, route through parent • Nodes are still allowed to join the network 11/04/15 Dept of electronics engineering, Pondicherry University 13
  • 14. Meshed AT Formation • Neighbors treat each other as a child. • Advantages I. Shorter paths II.Elimination of SPOFs 11/04/15 Dept of electronics engineering, Pondicherry University 14
  • 15. Unicast Routing • Meshed Adaptive Tree I.Provides the basic functions of routing. II.Immediately available after MAT is formed. • Distributed Link State I.More efficient routing can be achieved. II.Requires exchange of neighbor information. III.Note global link state information is NOT needed 11/04/15 Dept of electronics engineering, Pondicherry University 15
  • 16. Unicast Routing –Summary • Simplicity I.No route discovery. II.No route repair. • Adaptive Address Assignment (AAA) I.avoiding “running out of addresses” problem. 11/04/15 Dept of electronics engineering, Pondicherry University 16
  • 17. • Meshed AT (MAT) i.shorter path. ii.Robustness. • Distributed Link State i.Scalability ii.multiple paths iii. robustness iv.shorter path 11/04/15 Dept of electronics engineering, Pondicherry University 17
  • 18. Multicast Routing • This multicast routing proposal is based on the Adaptive Tree protocol for the unicast routing. • The Adaptive Tree (AT) algorithm constructs a shared tree which spans all the nodes in a WPAN mesh network. • Our goal is to find a minimum sub-tree of the Adaptive Tree which covers all multicast members within each multicast group. 11/04/15 Dept of electronics engineering, Pondicherry University 18
  • 19. IEEE 802.15.5-HR • Layer architecture. • Network architecture. • Super frame architecture Single. 11/04/15 Dept of electronics engineering, Pondicherry University 19
  • 20. 11/04/15 Dept of electronics engineering, Pondicherry University 20
  • 21. The reference model for high-rate WPAN mesh 11/04/15 Dept of electronics engineering, Pondicherry University 21
  • 22. High Rate Mesh Service Support WPS • Network Setup • Tree Topology Discovery • ID Assignment • Neighborhood-based Wireless Path Selection • Tree-based Wireless Path Selection • Centralized Wireless Path Selection 11/04/15 Dept of electronics engineering, Pondicherry University 22
  • 23. Network Setup • Mesh Coordinator (MC) initializes the mesh network • Regularly announces mesh capability in its beacon • New MPN Cs scan for beacons • MPNCs choose free time to send beacons 11/04/15 Dept of electronics engineering, Pondicherry University 23
  • 24. Tree Topology Discovery 11/04/15 Dept of electronics engineering, Pondicherry University 24 • Each Mesh Pico net Controller (MPNC)belonging to the tree i.Waits for descendant report(s) from its children. ii.Estimates the number of own descendants. iii.Reports number of descendants to parent. • Process is repeated upon i.Topology discovery request from MC
  • 25. ID Assignment • After receiving topology update frames from all children i.MC reserves a block of IDs. ii.Assigns intervals of IDs to children. iii.Size of interval is proportional to reported number of children. • MPNC receives an ID block. • MPNC assigns ID to himself and its DEVs 11/04/15 Dept of electronics engineering, Pondicherry University 25
  • 26. APPLICATIONS Multimedia home network 11/04/15 Dept of electronics engineering, Pondicherry University 26
  • 27. Interconnection among PC and peripherals 11/04/15 Dept of electronics engineering, Pondicherry University 27
  • 28. • Interconnection among handheld devices • Automation and Control • Etc…. 11/04/15 Dept of electronics engineering, Pondicherry University 28
  • 29. 11/04/15 Dept of electronics engineering, Pondicherry University 29