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Energy Efficient for Real Time Data Aggregation in Wireless Sensor


  • pg 1
									   Research Issues in
Wireless Sensor Networks
         Prof. Xiaohua Jia
    Dept. of Computer Science
   City University of Hong Kong

                  CS Dept, City Univ.   1
Characteristics of Sensor Networks
   Low power and limited energy supply
   Simple CPU (low speed, small memory)
   Low network speed, unreliable data link, small
    transmission range
   Large deployment and dynamic replacement
   No infrastructure and self & dynamic organization

                        CS Dept, City Univ.             2
Layered Structure of Sensor Networks


                    Database Queries

         Data Aggregation                           Routing
  Localization   Time Synch        Topology Cont’l       Security

                     OS / Network
                 Hardware / MAC layer
                              CS Dept, City Univ.                   3
Localization / Time Synchronization

   Localization of tagged and untagged objects
   Finding locations of sensors without GPS
   One-hop or multi-hop time synchronization
    (important for scheduling of sensor nodes)

                        CS Dept, City Univ.       4
Topology Control
Adjust transmission power of nodes or determine
  logical neighbors of nodes.
 Achieving desirable connectivity / reducing
  interferences / increasing throughput
 QoS topology control

 Dynamic, distributed (localized), and efficient.

                       CS Dept, City Univ.           5
Placement and Coverage Issues
   Placement of sensor nodes for good coverage or
    network connectivity.
   Placement of data-sinks for efficient data
    collection or network throughput.
   Network connectivity (or area coverage) and
    node density.
   Scheduling of nodes sleep / active for energy
    saving under desirable area coverage.

                       CS Dept, City Univ.           6
Security of Sensor Networks
   Light-weight cryptographic primitives
   Light-weight security protocols for key distribution
    / key management / authentication
   Intrusion detection / intrusion tolerance
   Secured routing (lack of security infrastructure)

                         CS Dept, City Univ.               7
Routing & Data Aggregation
   Data centric routing (data push / pull / hybrid)
   Backbone computation / clustering
   Geographic routing (GPSR, etc)
   QoS routing
   Energy efficiency & real-time issues
   Broadcasting / multicasting / anycasting
   Data aggregation & query optimizations

                          CS Dept, City Univ.          8
Data Query & Data Processing
   Database systems for sensor networks
   Application data processing / signal processing /
    pattern recognition
   Location sensitive database / spatial database

                         CS Dept, City Univ.            9
Applications of Sensor Networks
   Environment monitoring
   Agriculture
   Manufacturing industries
   Medicine
   Disaster warning / prevention / relief operations
   Military applications

                         CS Dept, City Univ.            10
Concluding Remarks
Strategic Research Directions of Sensor Networks:
 Special-purposed hardware design (application
  tailored, low cost).
 Security issues in sensor networks.

 Sensor network applications.

                     CS Dept, City Univ.            11

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