Router protocol on wireless sensor network Yuping SUN  155169552@163.com SOFTWARE ENGINEERING LABORATORY Department of Computer Science, Sun Yat-Sen University
Outline WSN Introduction The definition  of WSN The nodes of WSN The difference between WSN and Ad hoc  WSN Routing Protocol Conclusion Reference
The definition of WSN Definition[1]: consist of large amount of sensor nodes Multi-hop, self-organize wireless communication  cooperative sensing, collection, process Send to observe. [1] 李建中 ,  李金宝 ,  石胜飞 .  传感器网络及其数据管理的概念、问题与进展 .  软件学报 , 2003 (10) : 1717- 1725
the nodes of  WSN
The difference between WSN and Ad hoc (1/2)[1] The number of nodes Sensor nodes are densely deployed Sensor nodes are prone to failures The topology of a sensor network changes very frequently [1]Ian F. Akyildiz, Weilian Su, Yogesh Sankarasubramaniam, and Erdal Cayirci Georgia Institute of Technology” A Survey on Sensor Networks” IEEE Communications Magazine • August 2002
The difference between WSN and Ad hoc (2/2)[1] WSN broadcast  but ad hoc point-to point Sensor node are limited in power computation capacities and memory Sensor nodes may not have global identification
Outline WSN Introduction The definition  of WSN The nodes of WSN The difference between WSN and Ad hoc  WSN Routing Protocol Conclusion Reference
Routing protocol survey Traditional technique Flooding Gossiping Current routing technique Flat-routing Hierarchical-routing Location-based routing [1]Ian F. Akyildiz, Weilian Su, Yogesh Sankarasubramaniam, and Erdal Cayirci Georgia Institute of Technology” A Survey on Sensor Networks” IEEE Communications Magazine • August 2002
Flooding(1/2) A classical mechanisms to relay data in sensor networks without the need for any routing algorithms and topology maintenance. drawbacks: Implosion Overlap  Resource blindness
Flooding(2/2)
Gossiping A slightly enhanced version of flooding where the receiving node sends the packet to a randomly selected neighbor which picks another neighbor to forward the packet to and so on. Advantage: avoid the implosion Drawback: Transmission delay
Router protocol survey Traditional routing technique Flooding Gossiping Current routing technique[1] Flat-routing Hierarchical-routing Location-based routing [1]JAMAL N. AL-KARAKI, AHMED E. KAMAL,”   ROUTING TECHNIQUES IN WIRELESS SENSOR NETWORKS: A SURVEY ”,  IEEE Wireless Communications • December 2004
Flat-routing SPIN (Sensor Protocols for Information via Negotiation) DD (Directed diffusion) Rumor routing
SPIN(1/3)[1] A family of adaptive protocols called Sensor Protocols for Information via Negotiation assign a high-level name to completely describe their collected data (called meta-data) Use thee types of messages ADV (advertisement), REQ (request) and DATA [1]W. Heinzelman, J. Kulik, and H. Balakrishnan, “Adaptive Protocols for Information Dissemination in Wireless Sensor Networks,”  Proc. 5 th ACM/IEEE Mobicom , Seattle, WA, Aug. 1999. pp. 174–85.
SPIN(2/3)
SPIN(3/3) Topological changes are localized  provides more energy savings than flooding, and metadata negotiation almost halves the redundant data.  Drawback: SPIN’s data advertisement mechanism cannot guarantee delivery of data.
Flat-routing SPIN (Sensor Protocols for Information via Negotiation) DD (Directed diffusion) Rumor routing
DD(1/3)[1] Propagate interest Set up gradients Send data and path reinforcement [1]C. Intanagonwiwat, R. Govindan, and D. Estrin, “Directed Diffusion: a Scalable and Robust Communication Paradigm for Sensor Networks,”  Proc. ACM Mobi- Com 2000 , Boston, MA, 2000, pp.56–67.
DD(2/3)
DD(3/3) Directed diffusion differs from SPIN in two aspects. Query method Communication method directed diffusion may not be applied to applications (e.g., environmental monitoring)  Matching data to queries might require some extra overhead
Flat-routing SPIN (Sensor Protocols for Information via Negotiation) DD (Directed diffusion) Rumor routing
Rumor routing[1] A variation of directed diffusion Use  an events table and  a  agent The number of events is small and the number of queries is large [1]D. Braginsky and D. Estrin, “Rumor Routing  Algorithm for Sensor Networks,”  Proc. 1st Wksp. Sensor Networks and Apps. , Atlanta, GA, Oct. 2002.
Rumor routing
Router protocol survey Traditional routing technique Flooding Gossiping Current routing technique Flat-routing Hierarchical-routing Location-based routing
Hierarchical-routing LEACH (Low Energy Adaptive Clustering Hierarchy ) PEGASIS (Power-Efficient Gathering in Sensor Information Systems) TEEN(APTEEN) (Threshold-Sensitive Energy Efficient Protocols)
LEACH(1/3)[1] LEACH is a cluster-based protocol Setup phase Steady state phase [1]. Heinzelman, A. Chandrakasan and H. Balakrishnan, “Energy-Efficient Communication  Protocol for Wireless Microsensor Networks,”  Proc. 33rd Hawaii Int’l. Conf. Sys. Sci. , Jan. 2000.
LEACH(2/3)
LEACH(3/3)[1] Drawbacks It is not applicable to networks deployed in large regions The idea of dynamic clustering brings extra overhead The protocol assumes that all nodes begin with the same amount of energy capacity in each election round, assuming that being a CH consumes approximately the same amount of energy fore ach node
Comparison between SPIN LEACH and directed diffusion[1] [1]W. Heinzelman, A. Chandrakasan and H. Balakrishnan, “Energy-Efficient Communication Protocol for Wireless Microsensor Networks,”  Proc. 33rd Hawaii Int’l. Conf. Sys. Sci. , Jan. 2000.
Hierarchical-routing LEACH (Low Energy Adaptive Clustering Hierarchy) PEGASIS (Power-Efficient Gathering in Sensor Information Systems) TEEN(APTEEN) (Threshold-Sensitive Energy Efficient Protocols)
PEGASIS(1/2)[1] An enhancement over the LEACH protocol is a near optimal chain-based protocol increase the lifetime of each node by using collaborative techniques. allow only local coordination between nodes and the bandwidth consumed in communication is reduced [1]S. Lindsey and C. Raghavendra, “PEGASIS: Power-Efficient Gathering in Sensor Information Systems,”  IEEE Aerospace Conf. Proc. , 2002, vol. 3, 9–16, pp. 1125–30.
PEGASIS(2/2) Drawbacks: assumes that each sensor node is able to communicate with the BS directly assumes that all sensor nodes have the same level of energy and are likely to die at the same time the single leader can become a bottleneck. excessive data delay
Comparison between PEGASIS and SPIN PEGASIS saving energy in several stages In the local gathering , the distance that node transmit The amount of data for CH head to receive Only one node transmits to BS
 
Hierarchical-routing LEACH (Low Energy Adaptive Clustering Hierarchy) PEGASIS (Power-Efficient Gathering in Sensor Information Systems) TEEN (Threshold-Sensitive Energy Efficient Protocols)
TEEN[1] TEEN’S CH sensor sends its members a hard threshold and a soft threshold. TEEN’S suitability for time-critical sensing applications TEEN is also quite efficient in terms of energy consumption and response time TEEN also allows the user to control the energy consumption and accuracy to suit the application. [1]A. Manjeshwar and D. P. Agarwal, “TEEN: a Routing  Protocol for Enhanced  Efficiency in Wireless Sensor Networks,”  1st Int’l. Wksp. on Parallel and Distrib. Comp. Issues in WirelessNetworks and Mobile Comp. , April 2001.
Comparison of between TEEN and LEACH average energy dissipation(100nodes and 100*100units)
Hierarchical vs. flat topologies routing.[1] [1]JAMAL N. AL-KARAKI, AHMED E. KAMAL,”   ROUTING TECHNIQUES IN WIRELESS SENSOR NETWORKS: A SURVEY ”,  IEEE Wireless Communications • December 2004
Router protocol survey Traditional routing technique Flooding Gossiping Current routing technique Flat-routing Hierarchical-routing Location-based routing
Location-based routing GEAR ( Geographic and Energy Aware Routing ) GEM
GEAR(1/3)[1] The key idea is to restrict the number of interests in directed diffusion by only considering a certain region rather than sending the interests to the whole network. keeps an estimated cost and a learning cost  [1]Y. Yu, D. Estrin, and R. Govindan, “Geographical and Energy-Aware Routing:A Recursive Data Dissemination Protocol  for Wireless Sensor Networks,” UCLA Comp. Sci. Dept. tech. rep., UCLA-CSD TR-010023, May 2001.
GEAR(2/3)
GEAR(3/3)
Comparison between  GPSR  and GEAR GPSR : designed for general mobile ad hoc networks Two parameter Uniform Traffic  Non-uniform Traffic For uneven traffic distribution, GEAR delivers 70–80 percent more packets than GPSR. For uniform traffic pairs GEAR delivers 25–35 percent more packets than GPSR.
GEM(1/2) Three type of storage data Local storage External storage Data-centric storage Setup phase Set up a tree Feedback the number of tree Assign the virtual degree
GEM(2/2) The main application of relative steady topology sensor network
Conclusion based on the network structure divide  three categories: flat, hierarchical, and location-based routing protocols. The advantages and disadvantages of each routing technique In general hierarchical routing  are outperform than flat routing
reference I. Akyildiz  et al. , “A Survey on Sensor Networks,”  IEEE Commun. Mag. , vol. 40, no. 8, Aug. 2002, pp. 102–14. W. Heinzelman, A. Chandrakasan and H. Balakrishnan,“Energy-Efficient Communication Protocol for Wireless Microsensor Networks,”  Proc. 33rd Hawaii Int’l. Conf. Sys. Sci. , Jan. 2000. F. Ye  et al. , “A Two-Tier Data Dissemination Model for Large-Scale Wireless S. Hedetniemi and A. Liestman, “A Survey of Gossiping and broadcasting in Communication Networks,”  IEEE Network , vol. 18, no. 4, 1988, pp. 319–49.
reference C. Intanagonwiwat, R. Govindan, and D. Estrin, “Directed Diffusion: a Scalable and Robust Communication Paradigm for Sensor Networks,”  Proc. ACM Mobi- Com 2000 , Boston, MA, 2000, pp. 56–67. D. Braginsky and D. Estrin, “Rumor Routing Algorithm for Sensor Networks,”  Proc. 1st Wksp. Sensor Networks and Apps. , Atlanta, GA, Oct. 2002. C. Schurgers and M.B. Srivastava, “Energy Efficient Routing in Wireless Sensor Networks,”  MILCOM Proc. Commun. for Network-Centric Ops.: Creating the Info. Force , McLean, VA, 2001. M. Chu, H. Haussecker, and F. Zhao, “Scalable Information Driven Sensor Querying and Routing for Ad Hoc Heterogeneous Sensor Networks,”  Int’l. J. High Perf. Comp. Apps. , vol. 16, no. 3, Aug. 2002.
reference Q. Li, J. Aslam and D. Rus, “Hierarchical Power-Aware Routing in Sensor Networks,”  Proc. DIMACS Wksp. Pervasive Net. , May, 2001. Y. Xu, J. Heidemann, and D. Estrin, “Geographyinformed Energy Conservation for Ad-hoc Routing,”  Proc. 7th Annual ACM/IEEE Int’l. Conf. Mobile Comp. and Net. , 2001, pp. 70–84.  S. Lindsey and C. Raghavendra, “PEGASIS: Power-Efficient Gathering in Sensor Information Systems,”  IEEE Aerospace Conf. Proc. , 2002, vol. 3, 9–16, pp. 1125–30. A. Manjeshwar  and D. P. Agarwal, “TEEN: a Routing Protocol for Enhanced Efficiency in Wireless Sensor Networks,”  1st Int’l. Wksp. on Parallel and Distrib. Comp. Issues in Wireless Networks and Mobile Comp. , April 2001.
Thank You!

Routing protocol on wireless sensor network

  • 1.
    Router protocol onwireless sensor network Yuping SUN [email protected] SOFTWARE ENGINEERING LABORATORY Department of Computer Science, Sun Yat-Sen University
  • 2.
    Outline WSN IntroductionThe definition of WSN The nodes of WSN The difference between WSN and Ad hoc WSN Routing Protocol Conclusion Reference
  • 3.
    The definition ofWSN Definition[1]: consist of large amount of sensor nodes Multi-hop, self-organize wireless communication cooperative sensing, collection, process Send to observe. [1] 李建中 , 李金宝 , 石胜飞 . 传感器网络及其数据管理的概念、问题与进展 . 软件学报 , 2003 (10) : 1717- 1725
  • 4.
  • 5.
    The difference betweenWSN and Ad hoc (1/2)[1] The number of nodes Sensor nodes are densely deployed Sensor nodes are prone to failures The topology of a sensor network changes very frequently [1]Ian F. Akyildiz, Weilian Su, Yogesh Sankarasubramaniam, and Erdal Cayirci Georgia Institute of Technology” A Survey on Sensor Networks” IEEE Communications Magazine • August 2002
  • 6.
    The difference betweenWSN and Ad hoc (2/2)[1] WSN broadcast but ad hoc point-to point Sensor node are limited in power computation capacities and memory Sensor nodes may not have global identification
  • 7.
    Outline WSN IntroductionThe definition of WSN The nodes of WSN The difference between WSN and Ad hoc WSN Routing Protocol Conclusion Reference
  • 8.
    Routing protocol surveyTraditional technique Flooding Gossiping Current routing technique Flat-routing Hierarchical-routing Location-based routing [1]Ian F. Akyildiz, Weilian Su, Yogesh Sankarasubramaniam, and Erdal Cayirci Georgia Institute of Technology” A Survey on Sensor Networks” IEEE Communications Magazine • August 2002
  • 9.
    Flooding(1/2) A classicalmechanisms to relay data in sensor networks without the need for any routing algorithms and topology maintenance. drawbacks: Implosion Overlap Resource blindness
  • 10.
  • 11.
    Gossiping A slightlyenhanced version of flooding where the receiving node sends the packet to a randomly selected neighbor which picks another neighbor to forward the packet to and so on. Advantage: avoid the implosion Drawback: Transmission delay
  • 12.
    Router protocol surveyTraditional routing technique Flooding Gossiping Current routing technique[1] Flat-routing Hierarchical-routing Location-based routing [1]JAMAL N. AL-KARAKI, AHMED E. KAMAL,” ROUTING TECHNIQUES IN WIRELESS SENSOR NETWORKS: A SURVEY ”, IEEE Wireless Communications • December 2004
  • 13.
    Flat-routing SPIN (SensorProtocols for Information via Negotiation) DD (Directed diffusion) Rumor routing
  • 14.
    SPIN(1/3)[1] A familyof adaptive protocols called Sensor Protocols for Information via Negotiation assign a high-level name to completely describe their collected data (called meta-data) Use thee types of messages ADV (advertisement), REQ (request) and DATA [1]W. Heinzelman, J. Kulik, and H. Balakrishnan, “Adaptive Protocols for Information Dissemination in Wireless Sensor Networks,” Proc. 5 th ACM/IEEE Mobicom , Seattle, WA, Aug. 1999. pp. 174–85.
  • 15.
  • 16.
    SPIN(3/3) Topological changesare localized provides more energy savings than flooding, and metadata negotiation almost halves the redundant data. Drawback: SPIN’s data advertisement mechanism cannot guarantee delivery of data.
  • 17.
    Flat-routing SPIN (SensorProtocols for Information via Negotiation) DD (Directed diffusion) Rumor routing
  • 18.
    DD(1/3)[1] Propagate interestSet up gradients Send data and path reinforcement [1]C. Intanagonwiwat, R. Govindan, and D. Estrin, “Directed Diffusion: a Scalable and Robust Communication Paradigm for Sensor Networks,” Proc. ACM Mobi- Com 2000 , Boston, MA, 2000, pp.56–67.
  • 19.
  • 20.
    DD(3/3) Directed diffusiondiffers from SPIN in two aspects. Query method Communication method directed diffusion may not be applied to applications (e.g., environmental monitoring) Matching data to queries might require some extra overhead
  • 21.
    Flat-routing SPIN (SensorProtocols for Information via Negotiation) DD (Directed diffusion) Rumor routing
  • 22.
    Rumor routing[1] Avariation of directed diffusion Use an events table and a agent The number of events is small and the number of queries is large [1]D. Braginsky and D. Estrin, “Rumor Routing Algorithm for Sensor Networks,” Proc. 1st Wksp. Sensor Networks and Apps. , Atlanta, GA, Oct. 2002.
  • 23.
  • 24.
    Router protocol surveyTraditional routing technique Flooding Gossiping Current routing technique Flat-routing Hierarchical-routing Location-based routing
  • 25.
    Hierarchical-routing LEACH (LowEnergy Adaptive Clustering Hierarchy ) PEGASIS (Power-Efficient Gathering in Sensor Information Systems) TEEN(APTEEN) (Threshold-Sensitive Energy Efficient Protocols)
  • 26.
    LEACH(1/3)[1] LEACH isa cluster-based protocol Setup phase Steady state phase [1]. Heinzelman, A. Chandrakasan and H. Balakrishnan, “Energy-Efficient Communication Protocol for Wireless Microsensor Networks,” Proc. 33rd Hawaii Int’l. Conf. Sys. Sci. , Jan. 2000.
  • 27.
  • 28.
    LEACH(3/3)[1] Drawbacks Itis not applicable to networks deployed in large regions The idea of dynamic clustering brings extra overhead The protocol assumes that all nodes begin with the same amount of energy capacity in each election round, assuming that being a CH consumes approximately the same amount of energy fore ach node
  • 29.
    Comparison between SPINLEACH and directed diffusion[1] [1]W. Heinzelman, A. Chandrakasan and H. Balakrishnan, “Energy-Efficient Communication Protocol for Wireless Microsensor Networks,” Proc. 33rd Hawaii Int’l. Conf. Sys. Sci. , Jan. 2000.
  • 30.
    Hierarchical-routing LEACH (LowEnergy Adaptive Clustering Hierarchy) PEGASIS (Power-Efficient Gathering in Sensor Information Systems) TEEN(APTEEN) (Threshold-Sensitive Energy Efficient Protocols)
  • 31.
    PEGASIS(1/2)[1] An enhancementover the LEACH protocol is a near optimal chain-based protocol increase the lifetime of each node by using collaborative techniques. allow only local coordination between nodes and the bandwidth consumed in communication is reduced [1]S. Lindsey and C. Raghavendra, “PEGASIS: Power-Efficient Gathering in Sensor Information Systems,” IEEE Aerospace Conf. Proc. , 2002, vol. 3, 9–16, pp. 1125–30.
  • 32.
    PEGASIS(2/2) Drawbacks: assumesthat each sensor node is able to communicate with the BS directly assumes that all sensor nodes have the same level of energy and are likely to die at the same time the single leader can become a bottleneck. excessive data delay
  • 33.
    Comparison between PEGASISand SPIN PEGASIS saving energy in several stages In the local gathering , the distance that node transmit The amount of data for CH head to receive Only one node transmits to BS
  • 34.
  • 35.
    Hierarchical-routing LEACH (LowEnergy Adaptive Clustering Hierarchy) PEGASIS (Power-Efficient Gathering in Sensor Information Systems) TEEN (Threshold-Sensitive Energy Efficient Protocols)
  • 36.
    TEEN[1] TEEN’S CHsensor sends its members a hard threshold and a soft threshold. TEEN’S suitability for time-critical sensing applications TEEN is also quite efficient in terms of energy consumption and response time TEEN also allows the user to control the energy consumption and accuracy to suit the application. [1]A. Manjeshwar and D. P. Agarwal, “TEEN: a Routing Protocol for Enhanced Efficiency in Wireless Sensor Networks,” 1st Int’l. Wksp. on Parallel and Distrib. Comp. Issues in WirelessNetworks and Mobile Comp. , April 2001.
  • 37.
    Comparison of betweenTEEN and LEACH average energy dissipation(100nodes and 100*100units)
  • 38.
    Hierarchical vs. flattopologies routing.[1] [1]JAMAL N. AL-KARAKI, AHMED E. KAMAL,” ROUTING TECHNIQUES IN WIRELESS SENSOR NETWORKS: A SURVEY ”, IEEE Wireless Communications • December 2004
  • 39.
    Router protocol surveyTraditional routing technique Flooding Gossiping Current routing technique Flat-routing Hierarchical-routing Location-based routing
  • 40.
    Location-based routing GEAR( Geographic and Energy Aware Routing ) GEM
  • 41.
    GEAR(1/3)[1] The keyidea is to restrict the number of interests in directed diffusion by only considering a certain region rather than sending the interests to the whole network. keeps an estimated cost and a learning cost [1]Y. Yu, D. Estrin, and R. Govindan, “Geographical and Energy-Aware Routing:A Recursive Data Dissemination Protocol for Wireless Sensor Networks,” UCLA Comp. Sci. Dept. tech. rep., UCLA-CSD TR-010023, May 2001.
  • 42.
  • 43.
  • 44.
    Comparison between GPSR and GEAR GPSR : designed for general mobile ad hoc networks Two parameter Uniform Traffic Non-uniform Traffic For uneven traffic distribution, GEAR delivers 70–80 percent more packets than GPSR. For uniform traffic pairs GEAR delivers 25–35 percent more packets than GPSR.
  • 45.
    GEM(1/2) Three typeof storage data Local storage External storage Data-centric storage Setup phase Set up a tree Feedback the number of tree Assign the virtual degree
  • 46.
    GEM(2/2) The mainapplication of relative steady topology sensor network
  • 47.
    Conclusion based onthe network structure divide three categories: flat, hierarchical, and location-based routing protocols. The advantages and disadvantages of each routing technique In general hierarchical routing are outperform than flat routing
  • 48.
    reference I. Akyildiz et al. , “A Survey on Sensor Networks,” IEEE Commun. Mag. , vol. 40, no. 8, Aug. 2002, pp. 102–14. W. Heinzelman, A. Chandrakasan and H. Balakrishnan,“Energy-Efficient Communication Protocol for Wireless Microsensor Networks,” Proc. 33rd Hawaii Int’l. Conf. Sys. Sci. , Jan. 2000. F. Ye et al. , “A Two-Tier Data Dissemination Model for Large-Scale Wireless S. Hedetniemi and A. Liestman, “A Survey of Gossiping and broadcasting in Communication Networks,” IEEE Network , vol. 18, no. 4, 1988, pp. 319–49.
  • 49.
    reference C. Intanagonwiwat,R. Govindan, and D. Estrin, “Directed Diffusion: a Scalable and Robust Communication Paradigm for Sensor Networks,” Proc. ACM Mobi- Com 2000 , Boston, MA, 2000, pp. 56–67. D. Braginsky and D. Estrin, “Rumor Routing Algorithm for Sensor Networks,” Proc. 1st Wksp. Sensor Networks and Apps. , Atlanta, GA, Oct. 2002. C. Schurgers and M.B. Srivastava, “Energy Efficient Routing in Wireless Sensor Networks,” MILCOM Proc. Commun. for Network-Centric Ops.: Creating the Info. Force , McLean, VA, 2001. M. Chu, H. Haussecker, and F. Zhao, “Scalable Information Driven Sensor Querying and Routing for Ad Hoc Heterogeneous Sensor Networks,” Int’l. J. High Perf. Comp. Apps. , vol. 16, no. 3, Aug. 2002.
  • 50.
    reference Q. Li,J. Aslam and D. Rus, “Hierarchical Power-Aware Routing in Sensor Networks,” Proc. DIMACS Wksp. Pervasive Net. , May, 2001. Y. Xu, J. Heidemann, and D. Estrin, “Geographyinformed Energy Conservation for Ad-hoc Routing,” Proc. 7th Annual ACM/IEEE Int’l. Conf. Mobile Comp. and Net. , 2001, pp. 70–84. S. Lindsey and C. Raghavendra, “PEGASIS: Power-Efficient Gathering in Sensor Information Systems,” IEEE Aerospace Conf. Proc. , 2002, vol. 3, 9–16, pp. 1125–30. A. Manjeshwar and D. P. Agarwal, “TEEN: a Routing Protocol for Enhanced Efficiency in Wireless Sensor Networks,” 1st Int’l. Wksp. on Parallel and Distrib. Comp. Issues in Wireless Networks and Mobile Comp. , April 2001.
  • 51.

Editor's Notes

  • #2 1.Suvery on Routing Protocols of Wireless Sensor Networks Yuping SUN. 注意写法 . 文件名 : Y.P. Sun S.Y.Ping 是不正规的 2. 51 页可能太多 , 明天把握节奏 . 一般 30 页能讲一个下午 . 3. 请在参考文献列于当页页尾
  • #3 introduction 不要花太多时间
  • #4 aggresion --> aggregation? 如果要给出定义 , 你可以 : 1. 引经据典 , 不然自己的定义是不具有说服力 . 2, 讲清楚为什么要这样定义 . 3. 这几点有内在的逻辑关系吗 ? 4. 这几点能把 WSN 的全貌都表达出来了吗 ?
  • #5 这一页可以不用介绍了 , 已经被介绍过很多次 .
  • #6 [1] Ad Hoc 网络是一种没有有线基础设施支持的移动网络,网络中的节点均由移动主机构成。 Ad Hoc 网络最初应用于军事领域,它的研究起源于战场环境下分组无线网数据通信项目 MANET(mobile ad hoc networks) 是一种可以根据需要随时快速搭建的无线网络 , 不需要任何基础设施的支持 .
  • #7 请指明引用出处
  • #8 introduction 不要花太多时间
  • #10 不需要考虑网络拓扑结构和路由计算
  • #13 估计看到这一页的时候 , 李老师会问如下问题 : 这种分类全面吗 ? 是谁来分的 ? 是根据什么来分的 . 他们之间的关系是什么 . 你能否用简短的几句话解释一下 Flat-routing, hierarchical-routing 和 location-based routing 三者的不同和联系 . 接下来 , 你介绍了很多很多算法 . 你要关注到听众的兴趣和智力 . 你需要想想如何把这个演讲组织得有逻辑一点 , 并且让听众听得懂 , 又不觉得烦 . 首先你就不能把每个 PROTOCOL 都详细讲 . 请在适当地方加入小结 . 请在 PPT 最后加入 conclusion 和 reference