a cooperative diversity- based robust mac protocol in wireless ad hoc networks sangman moh, chansu...
TRANSCRIPT
![Page 1: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/1.jpg)
1
A Cooperative Diversity-Based Robust
MAC Protocol in wireless Ad Hoc
NetworksSangman Moh, Chansu Yu
Chosun University, Cleveland State UniversityKorea, Cleveland
IEEE TPDS, March 2011
![Page 2: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/2.jpg)
2
OutlineO IntroductionO Background O Cooperative Diversity MACO Performance EvaluationO Conclusion and Future Work
![Page 3: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/3.jpg)
3
IntroductionO In wireless ad hoc networks, signal fading
and interference are two major obstacles in realizing their full potential in delivering signals.
O Cooperation among the nodes is considered critically important in addressing these problems.
O It may be difficult to maximize the performance unless nodes are coordinated to cooperate at lower levels.O MAC- and PHY- layer
![Page 4: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/4.jpg)
4
Introduction O Recently, some researches in developing
cooperative MAC algorithms O Path-centric medium access O MAC-layer packet relaying
O is determined in a proactive mannerO is used to forward frames at higher bit ratesO but not enhance the communication
reliability, especially in interference-rich environment
O Cooperative communicationO enhance the link reliability
![Page 5: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/5.jpg)
5
IntroductionO Cooperative communication exploits
diversity offered by multiple users, known as multiuser or cooperative diversity.
O It dramatically improves bit error rate (BER).O More reliable transmissionO Higher throughput
![Page 6: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/6.jpg)
6
Background
OCooperative DiversityOCooperative Diversity in
Wireless Ad Hoc Networks
![Page 7: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/7.jpg)
7
Cooperative DiversityO Two types of cooperative diversity
algorithmsO Repetition-based
O Amplify-and-forwardO Decode-and-forward
O Space-time-codedO Distributed space-time coding (DSTC)O Space-time coding (STC) (multiantenna
system)O Space-time block coding (STBC)
(multiantenna system)
![Page 8: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/8.jpg)
8
DSTC
![Page 9: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/9.jpg)
9
Cooperative Diversity in Wireless Ad Hoc NetworksO Azgin et al. proposed Cooperative
MAC (C-MAC) and the corresponding routing protocols for wireless ad hoc network. (GlobeCom 2005) O Relaying start (RS)O Relay acknowledgement (RA)O Relay broadcasting (RB)O Transmission start (TS)O RTS-CTS-RS-RA-RB-TS-ACK
![Page 10: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/10.jpg)
10
Cooperative Diversity MAC
O Overview
![Page 11: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/11.jpg)
11
A Simple Cooperative scheme
O The authors proposed in ICC 2007.O Based on DCF of the IEEE 802.11
standardO If a primary link is reliable enough to
successfully transmit frames, no cooperative transmission is enabled.
O If it fails, the sender retransmits the frame but cooperatively with its partnerO When to cooperate
![Page 12: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/12.jpg)
12
A case for simple scheme
![Page 13: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/13.jpg)
13
Problems of simple scheme
O Twice longer than that without cooperation
O An RTS failure can be due to collisions/interference from other nodes’ communication
O The RTS/CTS exchange effectively eliminates the problem associated with “the hidden terminals”.
![Page 14: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/14.jpg)
14
Cooperative Diversity MAC
![Page 15: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/15.jpg)
15
State transition diagrams
Sender
Receiver
Partner
![Page 16: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/16.jpg)
16
Partner Selection and Its Propagation
O Every node proactively selects its partner by monitoring or overhearing its neighbors with respect to link quality.
O Measure and record the link quality while receiving a frame
O The neighbor with the best link quality among all neighbors is chosen as its partner.
![Page 17: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/17.jpg)
17
Why choose the neighbor with the best link quality?O Three reasons behind this choice
O Communication between a node and its partner must be highly reliable.
O A partner with the best link quality is most probably the closest node.
O It ensures that the sender and the partner share the same communication environment so that they can make a consistent decision on cooperation.
![Page 18: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/18.jpg)
18
Performance Evaluation
O Using ns-2 simulatorO 50 mobile nodes move over a square area
of 300X1500 m2
O Each simulation runs for 900 seconds. O Source-destination pairs are randomly
selected.O Mobile nodes are assumed to move
randomly with the node speed of 0-5 m/secO Pause time between moves varies from 0
to 900 seconds.
![Page 19: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/19.jpg)
19
Performance Comparison
This is due to the complex interplay among MAC- and routing-layer protocols in MANET environment
![Page 20: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/20.jpg)
20
Overhead and cooperation efficiency
![Page 21: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/21.jpg)
21
Impact of environment noise
![Page 22: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/22.jpg)
22
Effect of network traffic on packet delivery ratio
![Page 23: A Cooperative Diversity- Based Robust MAC Protocol in wireless Ad Hoc Networks Sangman Moh, Chansu Yu Chosun University, Cleveland State University Korea,](https://reader035.vdocument.in/reader035/viewer/2022070400/56649e605503460f94b5b7b9/html5/thumbnails/23.jpg)
23
Conclusions and Future Work
O This paper proposed CD-MAC and discusses design issues and performance benefits in wireless ad hoc network.
O When a communication link is unreliable, a sender transmits its signal together with its partner delivering the signal more reliably.
O As a future work, exploiting cooperative diversity based on multichannel interfaces will be investigated.