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Mobile and Wireless Communications Networks

VerlagSpringer-Verlag
Erscheinungsjahr2005
Seitenanzahl509 Seiten
ISBN9780387231501
FormatPDF
KopierschutzDRM
GerätePC/MAC/eReader/Tablet
Preis155,10 EUR
This book draws together papers presented at the IFIP/IEEE Sixth Conference on Mobile and Wireless Communications. It focuses on the convergence of mobile wireless networks and the Internet, in particular, integrating stand-alone mobile networks with infrastructure wireless networks to create more robust and accommodating wireless networks.

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Researchers in network security, QoS and mobile networks 

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AN ALTERNATIVE METRIC FOR CHANNEL ESTIMATION WITH APPLICATIONS IN BLUETOOTH SCHEDULING (S. 203-204)

João H. Kleinschmidt, Marcelo E. Pellenz and Luiz A. P. Lima Jr.
Graduate Program in Computer Science, Pontifical Catholic University of Paraná, Curitiba – PR, Brazil. E-mail:{joaohk, marcelo, laplima}@ppgia.pucpr.br

Abstract: Once Wireless Local Networks (WLAN) and Bluetooth devices share the same frequency band (ISM) there is a potential risk of interference if they are supposed to operate close to each other. Additionally, the signal fading effects on mobile Bluetooth networks may deeply affect the overall performance. That is why the use of strategies that minimize transmission on channels with great interference or severe fading is so important. This paper proposes and investigates the use of parameter m of the Nakagami distribution, as the channel estimation metric. We observed that parameter m may provide faster estimates on the channel condition than the bit error rate metric. This metric is applied in a new scheduling algorithm for Bluetooth piconets. Simulation results showing the performance of the algorithm for different traffic conditions are eventually presented. Bluetooth; wireless networks; Nakagami-m fading; scheduling. Key words:

1. INTRODUCTION

Bluetooth is emerging as an important standard1 for short range and lowpower wireless communications. It operates in the 2.4 GHz ISM (Industrial, Scientific and Medical) band employing a frequency-hopping spread spectrum technique. The transmission rate is up to 1 Mbps, using GFSK (Gaussian Frequency Shift Keying) modulation. The Bluetooth MAC protocol is designed to facilitate the construction of ad hoc networks. The devices can communicate with each other forming a network with up to eight nodes, called piconet. Within a piconet, one device is assigned as a master node and the others devices act as slave nodes. Devices in different piconets can communicate using a structure called scatternet. The channel is divided in time slots of A time-division duplex (TDD) scheme is used for full-duplex operation. For data transmission Bluetooth employs seven asynchronous packet types.

Each packet may occupy 1, 3 or 5 time slots. The throughput of Bluetooth links using asynchronous packets was investigated2 for the additive white Gaussian noise (AWGN) channel and for the Rayleigh fading channel. In other work3, we extended the results presented by Valenti2 looking into the performance of Bluetooth links in Nakagami-m fading channels. The sharing of the same frequency band between WLAN and Bluetooth devices may cause interference, if they are operating close to each other. Additionally, may occur mutual interference between different Bluetooth piconets operating in the same area. In Bluetooth networks with node mobility, like in sensor networks applications, the fading effects in the radio signal may significantly decrease the link performance. The use of strategies that minimize the transmission in channels with great interference or severe fading, may substantially improve the piconet performance. Extensive empirical measurements have confirmed the usefulness of the Nakagami-m distribution for modeling radio links13,14. The Nakagami-m distribution4 allows a better characterization of real channels because it spans, via the parameter m, the widest range of multipath fading distributions. For m=1 we get the Rayleigh distribution.

Using m<1 or m>1 we obtain fading intensities more and less severe than Rayleigh, respectively. This work proposes the use of fading parameter m as an alternative channel quality metric. This parameter can be estimated based on the received symbols. In a mobile wireless network, when a node position changes from line-of-sight to non-line-of-sight, for example, the impact in the signal propagation characteristic may be interpreted as a change in the parameter m. This model is interesting when Bluetooth devices are applied to ad hoc sensor networks. Power class one Bluetooth devices can cover ranges up to 100 meters, allowing the formation of large area piconets or scatternets. We also propose a new scheduling algorithm for Bluetooth piconets, which uses the channel quality information in the scheduling policy.
Inhaltsverzeichnis
Contents6
UNDERSTANDING THE INTERACTIONS BETWEEN UNICAST AND GROUP COMMUNICATIONS SESSIONS IN AD HOC NETWORKS9
1. Introduction9
2. Background10
3. Issues that may arise when unicast and group communications protocols coexist13
3.1 Degradations in Packet Delivery Performance13
3.2 Increased Latency Effects14
3.3 Increased Control Overhead14
4. Simulation Study15
4.1 Simulation results15
4.2 The effects of unicast protocol on the performance of group communication protocols16
4.3 The effects of group communications protocols on the performance of the unicast protocol17
5. Conclusions19
References20
CROSS- LAYER SIMULATION AND OPTIMIZATION FOR MOBILE AD- HOC NETWORKS21
Introduction21
1. Related Work22
2. IEEE 802.11 MAC Layer Approach23
3. Network Layer Approach26
4. Expected Result27
5. Future Works28
6. Simulation Issues28
7. Conclusion29
References29
IMPROVING TCP PERFORMANCE OVER WIRELESS NETWORKS USING LOSS DIFFERENTIATION ALGORITHMS31
1. Introduction31
2. TCP NewReno Enhanced with Vegas Loss Predictor32
3. Simulation Network Model33
4. Accuracy Evaluation34
5. TCP Performance over Wireless Links36
6. Conclusions41
References41
TCP PERFORMANCES IN A HYBRID BROADCAST/ TELECOMMUNICATION SYSTEM43
1. Introduction43
2. Issues raised by the GPRS return channel44
2.1 GPRS Bidirectional mode45
2.2 GPRS Unidirectional mode45
2.3 GPRS uplink critical throughput46
3. Simulation studies of the hybrid network performances46
3.1 Simulation model of the hybrid network46
3.2 Asymmetries47
3.3 Hybrid routing50
4. Experimentations50
5. Conclusion52
References53
HANDOFF NOTIFICATION IN WIRELESS HYBRID NETWORKS54
1. Introduction54
2. Wireless Hybrid Network55
3. Comparing the Route Update strategies56
3.1 Acknowledged broadcast57
3.2 Simulation Results58
4. Optimization of the mobility notification59
4.1 Differential Route updates60
4.2 Nack route60
4.3 Nack only61
4.4 Simulation Results61
5. Conclusion64
References65
SELECTIVE ACTIVE SCANNING FOR FAST HANDOFF IN WLAN USING SENSOR NETWORKS66
1. Introduction66
2. Layer 2 Handoff Process and Related Works67
3. Architecture Design70
3.1 Architecture overview70
3.2 Selective Active Scanning for Fast Handoff70
3.3 Benefit of the overlay sensor network74
4. Evaluation74
5. Conclusion76
References77
AN ANALYSIS OF MOBILE IPv6 SIGNALING LOAD IN NEXT GENERATION MOBILE NETWORKS78
1. INTRODUCTION78
2. BINDING UPDATE PROCEDURE80
3. BASELINE MOBILE IPv6 SIGNALING LOAD83
4. ANALYSIS OF INBAND SIGNALING86
5. CONCLUSION88
ACKNOWLEDGEMENTS89
REFERENCES89
PEER-TO-PEER BASED ARCHITECTURE FOR MOBILITY MANAGEMENT IN WIRELESS NETWORKS90
1. INTRODUCTION90
2. RELATED WORK91
3. PEER-TO-PEER BASED ARCHITECTURE92
3.1 System Overview92
3.2 DNS Structure94
3.3 P2P Structure95
3.4 Region Structure96
3.5 System Operations97
4. PERFORMANCE EVALUATION99
5. CONCLUSION100
ACKNOWLEDGMENTS100
REFERENCES101
SUPPORTING GROUPWARE IN MOBILE NETWORKS102
1. Introduction102
2. Related Work103
3. Model and Architecture104
3.1 Network model104
3.2 Design goals105
3.3 Architecture105
4. MGM Protocols106
4.1 Exploiting Mobile IP106
4.2 DNS based solutions107
4.3 MGMFlood107
4.4 MGMLeader108
4.5 Dynamic MGMs110
5. MGM Protocol Evaluation110
5.1 Packet delay evaluation110
5.2 Control plane evaluation111
6. Transport Issues112
7. Conclusions113
References113
RSM-WISP: ROAMING AND SERVICE MANAGEMENT IN HOTSPOT NETWORKS THROUGH A POLICY BASED MANAGEMENT ARCHITECTURE114
1. INTRODUCTION114
2. HOTSPOT ACCESS NETWORK MANAGEMENT115
2.1 Management Objectives115
2.2 Management Challenges116
3. RSM-WISP117
3.1 Architecture118
3.2 Policy Specification119
3.3 Architecture Implementation122
4. CONCLUSION124
5. REFERENCES125
INTEGRATED RECONFIGURATION MANAGEMENT FOR THE SUPPORT OF END TO END RECONFIGURATION126
1. INTRODUCTION126
1.1 Towards reconfigurability126
1.2 Related work127
2. RECONFIGURATION MANAGEMENT ASPECTS128
3. RECONFIGURATION MANAGEMENT PLANE ARCHITECTURE130
3.1 General architecture130
3.2 Architectural components131
3.3 Communication between RMP and external entities132
3.4 Case studies133
4. CONCLUSIONS135
ACKNOWLEDGEMENTS136
REFERENCES136
REPLICA ALLOCATION CONSIDERING DATA UPDATE INTERVALS IN AD HOC NETWORKS137
1. Introduction137
2. Related Works138
3. Assumptions and Approach139
4. Replica Allocation Methods140
4.1 Replica allocation140
4.2 Cache invalidation143
5. Simulation Experiments144
5.1 Simulation model144
5.2 Effects of value144
5.3 Effects of average update period146
6. Conclusions147
Acknowledgments148
References148
ANOVA-INFORMED DECISION TREES FOR VOICE APPLICATIONS OVER MANETS*149
1. Introduction149
2. Simulation Analysis of Audio Packet Delays150
3. Designed Experiments and ANOVA Analysis153
4. Learning Theory and Decision Trees154
5. DoE and Learning Methodologies DoE and ANOVA Methodologies155
6. DoE and Learning Theory Results and Discussion DoE Results and Discussion157
7. Conclusions and Future Work159
References159
ROUTE STABILITY TECHNIQUES FOR ENHANCED VIDEO DELIVERY ON MANETS161
1. Introduction161
2. Related work162
3. Route discovery extensions to DSR163
4. Effects of route stability on real-time video streams164
5. Multipath routing167
6. Overall evaluation170
7. Summary171
References172
A NEW SMOOTHING JITTER ALGORITHM FOR VOICE OVER AD HOC NETWORKS173
ON THE COMPLEXITY OF RADIO RESOURCES ALLOCATION IN WCDMA SYSTEMS185
1 INTRODUCTION AND SYSTEM MODEL185
2 DOWNLINK187
3 UPLINK191
4 CONCLUDING REMARKS195
REFERENCES196
OPTIMIZATION OF PILOT POWER FOR SERVICE COVERAGE AND SMOOTH HANDOVER IN WCDMA NETWORKS197
1. Introduction197
2. System Model198
2.1 Preliminaries198
2.2 Service Constraints199
3. Problem Definition201
4. Two Ad Hoc Solutions201
5. Mathematical Formulations202
5.1 A Cell- bin Formulation202
5.2 A Refined Formulation202
6. A Lagrangean Heuristic203
7. Numerical Study204
8. Conclusions206
Acknowledgments207
References208
AN ALTERNATIVE METRIC FOR CHANNEL ESTIMATION WITH APPLICATIONS IN BLUETOOTH SCHEDULING209
1. INTRODUCTION209
2. RELATED WORK ON PICONET SCHEDULING211
3. ESTIMATORS FOR THE NAKAGAMI FADING PARAMETER212
4. PROPOSED SCHEDULING ALGORITHM214
5. SIMULATION RESULTS215
6. CONCLUDING REMARKS218
7. REFERENCES218
DISTRIBUTED PAIRWISE KEY GENERATION USING SHARED POLYNOMIALS FOR WIRELESS AD HOC NETWORKS220
1. INTRODUCTION220
2. BACKGROUND222
2.1 Bivariate polynomial- based key pre- distribution222
2.2 Threshold secret sharing223
3. PROPOSED DISTRIBUTED KEY GENERATION SCHEME223
4. PERFORMANCE EVALUATION226
5. CONCLUSION230
ACKNOWLEDGEMENTS230
COLLABORATION ENFORCEMENT AND ADAPTIVE DATA REDIRECTION IN MOBILE AD HOC NETWORKS USING ONLY FIRSTHAND EXPERIENCE232
1. INTRODUCTION233
2. RELATED WORK234
3. THE EXPERIENCE-BASED APPROACH235
3.1 Node Configurations235
3.2 Selfish and Malicious Behaviors Considered236
3.3 Detection and Punishment of Selfishness and Malice in Data Forwarding236
3.4 Dynamic Redirection238
4. EXPERIMENTAL STUDY240
5. CONCLUDING REMARKS242
A SIMPLE PRIVACY EXTENSION FOR MOBILE IPV6244
1. Introduction244
2. Problem Statement245
3. Some possible solutions247
4. Our Proposal248
4.1 Temporary Mobile Identifier ( TMI)248
4.2 Protocol description250
5. Privacy with Hierarchical Mobile IPv6252
6. Conclusions253
References254
A TRUST- BASED ROUTING PROTOCOL FOR AD HOC NETWORKS255
1. Introduction255
2. Related work256
3. TRP protocol257
4. Performance evaluation263
5. Residual vulnerability265
6. Conclusion and future work265
References266
SHORT- TERM FAIRNESS OF 802.11 NETWORKS WITH SEVERAL HOSTS267
1. Introduction267
2. Related work268
3. Fairness269
3.1 Number of inter- transmissions270
3.2 Sliding window method with the Jain fairness index272
4. Experimental results272
4.1 Number of inter- transmissions273
4.2 Sliding window method with Jain fairness index275
4.3 Delay276
5. Conclusion277
References278
RAAR: A RELAY-BASED ADAPTIVE AUTO RATE PROTOCOL FOR MULTI- RATE AND MULTI-RANGE INFRASTRUCTURE WIRELESS LANS*279
1. Introduction279
2. Relay-Based Adaptive Auto Rate Control protocol (RAAR)281
3. Throughputs of IEEE 802.11 MAC, RAAR and D-RAAR284
4. Conclusion289
References289
A NON-TOKEN-BASED-DISTRIBUTED MUTUAL EXCLUSION ALGORITHM FOR SINGLE-HOP MOBILE AD HOC NETWORKS291
1. Introduction291
1.1 Related Works292
1.2 Our contribution292
2. Basic definitions293
3. A single-hop mutual exclusion algorithm294
3.1 Processing an example294
3.2 The Algorithm296
3.3 The use of a counter in each station297
3.4 Evaluation of the number of broadcast rounds necessary for n stations to enter the same CS298
4. Experimental results300
5. Concluding remarks301
References301
THE RECEIVER’S DILEMMA303
1. Introduction303
2. A Fundamental MANET Problem304
3. Some Strategies to Deal with Fading308
4. Simulation Analysis311
5. Summary and Conclusions312
Notes314
References314
THEORETICAL CAPACITY OF MULTI-HOP WIRELESS AD HOC NETWORKS315
1. Introduction315
2. Analysis of Network Saturation Capacity317
2.1 Boundary Conditions317
2.2 Discussion320
3. Analysis of Maximum Instantaneous Capacity320
3.1 Maximum Number of Simultaneously Active Links320
3.2 The Bottleneck Aggregate Link Set323
3.3 Discussion324
4. Conclusions326
HOW TO DISCOVER OPTIMAL ROUTES IN WIRELESS MULTIHOP NETWORKS327
1. Introduction327
2. Shortest Path Algorithms & Routing Metrics328
3. Existing Distributed Algorithms for Optimal Routing Ad Hoc Networks329
4. A Distributed Version of Dijkstra’s Shortest Path Algorithm330
4.1 Key Concepts & Basic Algorithm331
4.2 Mapping Metric Values to332
5. Implementational Aspects333
5.1 Differential Delay Mapping334
5.2 Local Delay Mapping335
6. Conclusions & Further Work337
References338
ASYMPTOTIC PHEROMONE BEHAVIOR IN SWARM INTELLIGENT MANETS339
1. Introduction339
1.1 Previous Work340
1.2 Structure of Paper340
2. Termite Routing for MANETs341
2.1 A Short Introduction to Ad-Hoc Networks341
2.2 Termite341
3. The Model343
4. Pheromone Update Analysis343
4.1 Single Link Pheromone344
4.2 Two Link Pheromone345
5. Analysis348
6. Conclusion349
References350
RANDOMIZED ROUTING ALGORITHMS351
Introduction351
1.1 Definitions of Routing Algorithms353
1.2 Empirical results356
1.2.1 Simulation Environment356
1.2.2 Discussion of Results357
1.3 Summary359
Acknowledgments360
References360
RBR: REFINEMENT- BASED ROUTE MAINTENANCE PROTOCOL IN WIRELESS AD HOC NETWORKS362
1. Introduction362
2. Passive Probe Route Redirection364
3. Active Probe Route Redirection368
4. Performance Evaluations369
5. Conclusion372
References372
ENABLING ENERGY DEMANDRESPONSE WITH VEHICULAR MESH NETWORKS374
1. INTRODUCTION374
2. VMESH DESIGN RATIONALE FOR DEMAND RESPONSE376
3. VMESH ARCHITECTURE377
4. ROUTING IN VMESH380
5. PRELIMINARY RESULTS382
6. CONCLUSION AND FUTURE WORK384
References385
CONTEXT-AWARE INTER-NETWORKING FOR WIRELESS NETWORKS386
1. Introduction386
2. Network model: the cell approach388
3. Heterogeneous merging: a smooth approach389
3.1 The case of heterogeneous cell interoperability390
3.2 Addressing heterogeneous cell interoperability390
4. Design and mechanisms391
4.1 The NRPDP Protocol391
4.2 The Routing Translator Daemon392
5. Application: AODV ( DSR, OLSR)393
5.1 AODV DSR394
5.2 AODV OLSR395
6. Conclusion396
References397
PERFORMANCE IMPACT OF MOBILITY IN AN EMULATED IP- BASED MULTIHOP RADIO ACCESS NETWORK398
1. Introduction398
2. Description of the Testbed399
3. Mobility Models400
3.1 Random Waypoint Model401
3.2 Random Direction Model402
4. Performance Evaluation402
4.1 Setup402
4.2 Movement Parameters403
4.3 Results and Interpretation405
5. Related Work407
6. Conclusions and Further Work407
Notes408
References408
Broadcast Services and Topology Control in Ad-Hoc Networks410
1 Introduction410
2 MAC Design and Broadcast services for Ad Hoc Networks411
3 Topology Control in Ad Hoc Networks413
4 The ADHOC-MAC protocol413
4.1 RR-ALOHA413
4.2 Multi-Hop Broadcast415
4.3 Topology Control in ADHOC MAC415
5 Performance Evaluation416
5.1 Single Hop Broadcast Efficiency417
5.2 Multi-Hop Broadcast efficiency418
5.3 Topology Control Algorithm Efficiency418
6 Conclusions420
References420
SPACE AND TIME CURVATURE IN INFORMATION PROPAGATION IN MASSIVELY DENSE AD HOC NETWORKS422
1. Introduction422
2. Quantitative results on time slotted networks Quantification of the problem424
3. Massively dense networks427
4. Introduction of time component429
5. Conclusion and perspectives433
References434
CLUSTER-BASED LOCATION-SERVICES FOR SCALABLE AD HOC NETWORK ROUTING435
1. INTRODUCTION435
2. RELATED WORK AND OUR MOTIVATION437
2.1 Basic Principles of Location-Based Routing438
2.2 Related Work on Location-service438
2.3 Related Work on Clustering439
2.4 Our Motivation440
3. HOME-ZONE BASED HIERARCHICAL LOCATION MANAGEMENT440
3.1 Associativity-based Stable Clustering440
3.2 Homezone-based Hierarchical Location-Service443
4. EVALUATION THROUGH SIMULATION446
5. CONCLUSIONS AND FUTURE WORK449
ACKNOWLEDGEMENT449
REFERENCES449
ON SELECTING NODES TO IMPROVE ESTIMATED POSITIONS451
1. Introduction451
2. Assumptions and definitions453
3. Anchors selection454
3.1 Simple convex hull455
3.2 Advanced hull455
4. Simulation Results456
4.1 Evaluation of the hull selection456
5. Conclusion461
References461
ENERGY-EFFICIENT MULTIMEDIA COMMUNICATIONS IN LOSSY MULTI- HOP WIRELESS NETWORKS463
1. Introduction463
2. Energy Management in Multi-Hop Wireless Networks464
2.1 Energy-Aware Communication464
2.2 Supporting End-to-End Communication with Hop-by-Hop Mechanisms465
3. Protocol Effectiveness and Energy Efficiency466
4. Application-Aware Link Layer Protocol466
4.1 Transport Protocol Support467
4.2 Intelligent Dropping Mechanism467
4.3 The Retransmission Mechanism468
5. Evaluation469
5.1 Effects of Error Rate on Performance470
5.2 Effects of Mobility on Performance471
6. Conclusions472
References473
ANALYZING THE ENERGY CONSUMPTION OF IEEE 802.11 AD HOC NETWORKS475
1. Introduction475
2. Energy Consumption of the Nodes476
3. Power Saving Techniques479
4. Conclusions485
References486
ENERGY-EFFICIENT RELIABLE PATHS FOR ON-DEMAND ROUTING PROTOCOLS487
1. Introduction487
2. Related Work487
3. Minimum Energy Reliable Paths488
3.1 Hop-by-Hop Retransmissions (HHR):488
3.2 End-to-End Retransmissions (EER):489
4. Estimating Link Error Rate489
4.1 BER using Radio Signal-to-Noise Ratio489
4.2 BER using Link Layer Probes490
4.3 BER Estimation for Variable Power Case490
5. AODV and its Proposed Modifications491
5.1 AODV Messages and Structures491
5.2 Route Discovery491
6. Simulation Experiments and Performance Evaluation493
6.1 Network Topology and Link Error Modeling493
6.2 Metrics495
6.3 Static Grid Topologies495
6.4 Static Random Topologies497
6.5 Mobile Topologies497
7. Conclusions497
MINIMUM POWER SYMMETRIC CONNECTIVITY PROBLEM IN WIRELESS NETWORKS: A NEW APPROACH499
1. Introduction499
2. Problem description501
3. An integer programming formulation502
3.1 Valid inequalities503
4. Preprocessing procedure505
5. The iterative exact algorithm506
6. Computational results506
6.1 Preprocessing procedure507
6.2 IEX algorithm507
7. Conclusion508
Acknowledgments508
References509

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