Wireless Communications and Mobile Computing, Volume 11

Volume 11, Number 1, January 2011

Research Articles

• 
  Lajos Hanzo, Rahim Tafazolli:
  The effects of shadow-fading on QoS-aware routing and admission control protocols designed for multi-hop MANETs. 1-22
• 
  Nadeem Ahmed, Salil S. Kanhere, Sanjay K. Jha:
  A pragmatic approach to area coverage in hybrid wireless sensor networks. 23-45
• 
  Heung-Gyoon Ryu:
  Combination of PAPR reduction and linearization for the OFDM communication system. 46-52
• 
  Wei-Kuo Chiang, Wen-Yen Chang:
  Network-initiated simultaneous mobility in voice over 3GPP-WLAN. 53-66
• 
  Rui Campos, Ricardo Duarte, Filipe Sousa, Manuel Ricardo, José Ruela:
  Network infrastructure extension using 802.1D-based wireless mesh networks. 67-89
• 
  Fabio Martignon:
  Multi-channel power-controlled directional MAC for wireless mesh networks. 90-107
• 
  Dalin Zhu, Balasubramaniam Natarajan, Justin S. Dyer:
  Peak-to-average power ratio reduction in space-time coded MIMO-OFDM via preprocessing. 108-120
• 
  Pengfei Sun, Li Zhang:
  A simple iterative carrier frequency synchronization technique for OFDMA uplink transmissions. 121-128
• 
  Li Cong, Liqiang Zhao, Kun Yang, Hailin Zhang, Guopeng Zhang:
  A Stackelberg game for resource allocation in multiuser cooperative transmission networks. 129-141

Volume 11, Number 2, February 2011

Network Security and Digital Forensics in Next Generation Communications Guest Editorial

• 
  Jong Hyuk Park, Stefanos Gritzalis, Hai Jin, Jenlong Wang:
  Network security and digital forensics in next generation communications. 143-145

Special Issue Papers

• 
  Sudip Misra, Sumit Goswami, Gyan Prakash Pathak, Nirav Shah:
  Efficient detection of public key infrastructure-based revoked keys in mobile ad hoc networks. 146-162
• 
  Naixue Xiong, Fan Yang, Hongyan Li, Jong Hyuk Park, Yuan-Shun Dai, Yi Pan:
  Security analysis and improvements of IEEE standard 802.16 in next generation wireless metropolitan access network. 163-175
• 
  Jong-Hyouk Lee, Tai-Myoung Chung:
  Secure handover for Proxy Mobile IPv6 in next-generation communications: scenarios and performance. 176-186
• 
  Xiaodong Lin, Hsiao-Hwa Chen:
  A secure and efficient RSU-aided bundle forwarding protocol for vehicular delay tolerant networks. 187-195
• 
  Binod Vaidya, Mieso K. Denko, Joel J. P. C. Rodrigues:
  Security mechanism for voice over multipath mobile ad hoc networks. 196-210
• 
  Hai-Cheng Chu, Der-Jiunn Deng, Han-Chieh Chao:
  The digital forensics of portable electronic communication devices based on a Skype IM session of a pocket PC for NGC. 211-225
• 
  Hua Guo, Yi Mu, Xiyong Zhang, Zhoujun Li:
  Authenticated key exchange protocol with selectable identities. 226-239
• 
  Jigang Liu, Tetsutaro Uehara, Ryôichi Sasaki:
  Development of digital forensics practice and research in Japan. 240-253
• 
  Alina Olteanu, Yang Xiao, Fei Hu, Bo Sun, Hongmei Deng:
  A lightweight block cipher based on a multiple recursive generator for wireless sensor networks and RFID. 254-266
• 
  Rodrigo Roman, Javier López, Pablo Najera:
  A cross-layer approach for integrating security mechanisms in sensor networks architectures. 267-276
• 
  Chol Soon Jang, Deok-Gyu Lee, Jong Wook Han, Jong Hyuk Park:
  Hybrid security protocol for wireless body area networks. 277-288
• 
  Iosif Terzis, Georgios Kambourakis, Giorgos Karopoulos, Costas Lambrinoudakis:
  Privacy preserving context transfer schemes for 4G networks. 289-302

Volume 11, Number 3, March 2011

Architectures and Protocols for Wireless Mesh, Ad Hoc, and Sensor Networks Guest Editorial

• 
  Farid Naït-Abdesselam, Kwang-Cheng Chen, Ehab S. Elmallah, Matthias Frank:
  Architectures and protocols for wireless mesh, ad hoc, and sensor networks. 303-305

Special Issue Papers

• 
  Feng Seng Chu, Kwang-Cheng Chen:
  Radio resource management of self-organizing OFDMA wireless mesh networks. 306-320
• 
  Alexander Zimmermann, Arnd Hannemann, Benjamin Schleinzer:
  IP address assignment in wireless mesh networks. 321-337
• 
  Parag S. Mogre, Nico d'Heureuse, Matthias Hollick, Ralf Steinmetz:
  CORE: centrally optimized routing extensions for efficient bandwidth management and network coding in the IEEE 802.16 MeSH mode. 338-356
• 
  Fei Xie, Kien A. Hua, Ning Jiang, Yao Hua Ho:
  Study of Patching-based and Caching-based video-on-demand in multi-hop WiMax mesh networks. 357-370
• 
  Parag S. Mogre, Kalman Graffi, Matthias Hollick, Ralf Steinmetz:
  A security framework for wireless mesh networks. 371-391
• 
  Marcello Caleffi, Luigi Paura:
  M-DART: multi-path dynamic address routing. 392-409
• 
  Hwee-Xian Tan, Mun Choon Chan, Peng Yong Kong, Chen-Khong Tham:
  SAUCeR, : a QoS-aware slotted-aloha based UWB MAC with cooperative retransmissions. 410-425
• 
  Sudip Misra, P. Venkata Krishna, Kiran Isaac Abraham:
  A simple learning automata-based solution for intrusion detection in wireless sensor networks. 426-441

Volume 11, Number 4, April 2011

Next Generation Mobility Management

• 
  Ilsun You, Youn-Hee Han, Yuh-Shyan Chen, Han-Chieh Chao:
  Next generation mobility management. 443-445
• 
  F. Richard Yu, Vincent W. S. Wong, Joo-Han Song, Victor C. M. Leung, Henry C. B. Chan:
  Next generation mobility management: an introduction. 446-458
• 
  Kun Zhu, Dusit Niyato, Ping Wang, Ekram Hossain, Dong In Kim:
  Mobility and handoff management in vehicular networks: a survey. 459-476
• 
  Jianfeng Guan, Huachun Zhou, Zhiwei Yan, Yajuan Qin, Hongke Zhang:
  Implementation and analysis of proxy MIPv6. 477-490
• 
  Hyon-Young Choi, Kwang-Ryoul Kim, Hyo-Beom Lee, Sung-Gi Min, Youn-Hee Han:
  Smart Buffering for seamless handover in Proxy Mobile IPv6. 491-499
• 
  Ryuji Wakikawa, Sawako Kiriyama, Sri Gundavelli:
  The applicability of virtual interface for inter-technology handoffs in Proxy Mobile IPv6. 500-507
• 
  A. Dev Pragad, Vasilis Friderikos, Paul Pangalos, A. Hamid Aghvami:
  QoS aware dynamic route optimization for Proxy Mobile IPv6 networks. 508-521
• 
  Yuh-Shyan Chen, Kun-Lin Wu:
  A cross-layer partner-assisted handoff scheme for hierarchical mobile IPv6 in IEEE 802.16e systems. 522-541
• 
  Shun-Ren Yang, Ya-Jun Huang, Chun-Wei Chiu:
  Soft handoff support for SIP-NEMO: design, implementation, and performance evaluation. 542-555
• 
  Yi Wu, Yanqun Le, Dongmei Zhang:
  An end-to-end framework of transport layer mobility management. 556-566

Volume 11, Number 5, May 2011

Wireless Mesh and Other Emerging Wireless Network Technologies

• 
  Arnaud Casteigts, Amiya Nayak, Ivan Stojmenovic:
  Communication protocols for vehicular ad hoc networks. 567-582
• 
  Goutam K. Audhya, Koushik Sinha, Sasthi C. Ghosh, Bhabani P. Sinha:
  A survey on the channel assignment problem in wireless networks. 583-609
• 
  Qin Xin, Yan Zhang, Laurence Tianruo Yang:
  Optimal fault-tolerant broadcasting in wireless mesh networks. 610-620
• 
  Thimma V. J. Ganesh Babu, Alagan Anpalagan, Jeremiah F. Hayes:
  Performance modeling of QoS in a multicode multicarrier CDMA wireless network with fading. 621-631
• 
  Wenxuan Guo, Xinming Huang:
  Achieving capacity fairness for wireless mesh networks. 632-643
• 
  Maazen Alsabaan, Weihua Zhuang, Ping Wang:
  Link layer solutions for supporting real-time traffic over CDMA wireless mesh networks. 644-653
• 
  Ertugrul Necdet Ciftcioglu, Özgür Gürbüz:
  Scheduling for next generation WLANs: filling the gap between offered and observed data rates. 654-666

Volume 11, Number 6, June 2011

• 
  Itzik Kitroser, Eldad Chai, Yehuda Ben-Shimol:
  Efficient mapping of multiple VoIP vocoders in WiMAX systems. 667-678
• 
  Pang-Wei Hsu, Tzong-Huei Lin, Herbert H. Chang, Yu-Ting Chen, Yin-Jiun Tseng, Chia-Hung Hsiao, Chia-Tai Chan, Hung-Wen Chiu, David Hung-Tsang Yen, Po-Chou Chen, Woei-Chyn Chu:
  Simulations and experiments for optimal deployment of an RFID-based location-aware system. 679-691
• 
  Kuang-Hao Liu, Hsiang-Yi Shin, Hsiao-Hwa Chen:
  Interference-resistant cooperative wireless networks based on complementary codes. 692-706
• 
  Navid Amini, Alireza Vahdatpour, Foad Dabiri, Hyduke Noshadi, Majid Sarrafzadeh:
  Joint consideration of energy-efficiency and coverage-preservation in microsensor networks. 707-722
• 
  Behrouz Shahgholi Ghahfarokhi, Naser Movahhedinia:
  A context-aware handover decision based on user perceived quality of service trigger. 723-741
• 
  Yongxu Hu, Kwok Hung Li, Kah Chan Teh:
  Performance and diversity analysis of decode-and-forward cooperative system over Nakagami-m fading channels. 742-749
• 
  Chih-Yung Chang, Shih-Chieh Lee, Yu-Chieh Chen:
  Channel-switching and power control mechanisms for improving network connectivity in wireless mesh networks. 750-766
• 
  Fernando Ciriaco, Taufik Abrão, Antonio Fischer de Toledo, Paul Jean Yehuda Jeszensky:
  Jointly multi-user detection and channel estimation with genetic algorithm. 767-782

Volume 11, Number 7, July 2011

Emerging Techniques for Wireless Vehicular Communications

• 
  Lingyang Song, Athanasios V. Vasilakos, Bingli Jiao, Junyi Wang, Wai Chen:
  Emerging techniques for wireless vehicular communications. 783-786
• 
  Wai Chen, Ratul K. Guha, Taek Jin Kwon, John Lee, Yuan-Ying Hsu:
  A survey and challenges in routing and data dissemination in vehicular ad hoc networks. 787-795
• 
  Supeng Leng, Huirong Fu, Qing Wang, Yan Zhang:
  Medium access control in vehicular ad hoc networks. 796-812
• 
  Francisco J. Martinez, Chai-Keong Toh, Juan-Carlos Cano, Carlos Miguel Tavares Calafate, Pietro Manzoni:
  A survey and comparative study of simulators for vehicular ad hoc networks (VANETs). 813-828
• 
  Xiang Cheng, Cheng-Xiang Wang, David I. Laurenson, Sana Salous, Athanasios V. Vasilakos:
  New deterministic and stochastic simulation models for non-isotropic scattering mobile-to-mobile Rayleigh fading channels. 829-842
• 
  Jinyun Ren, Rodney G. Vaughan:
  Absolute phase in mobile channels. 843-865
• 
  Bo Xu, Lianfeng Shen, Feng Yan, Jun Zheng:
  Doppler-shifted frequency measurement based positioning for roadside-vehicle communication systems. 866-875
• 
  Yanli Li, Xiaohui Duan, Meng Ma, Bingli Jiao:
  Studies on the coherence bandwidth of high-frequency vehicular communication system with antenna array. 876-887
• 
  Jiming Chen, Xianghui Cao, Yu Zhang, WeiQiang Xu, Youxian Sun:
  Measuring the performance of movement-assisted certificate revocation list distribution in VANET. 888-898
• 
  Romain Kuntz, Julien Montavont, Guillaume Schreiner, David Binet, Thomas Noël:
  An improved network mobility service for intelligent transportation systems. 899-915
• 
  Kuan-Lin Chiu, Ren-Hung Hwang, Yuh-Shyan Chen:
  Cross-layer design vehicle-aided handover scheme in VANETs. 916-928
• 
  Farid Farahmand, Isabella Cerutti, Ankitkumar N. Patel, Jason P. Jue, Joel J. P. C. Rodrigues:
  Performance of vehicular delay-tolerant networks with relay nodes. 929-938
• 
  Inhyeok Jang, Wooyeol Choi, Hyuk Lim:
  An opportunistic forwarding protocol with relay acknowledgment for vehicular ad hoc networks. 939-953
• 
  Jeremy J. Blum, Rajesh Natarajan, Azim Eskandarian:
  Synchronization challenges in media access coordination for vehicular ad hoc networks. 954-963
• 
  Yang Xiao, Yanping Zhang:
  Divide- and conquer-based surveillance framework using robots, sensor nodes, and RFID tags. 964-979
• 
  Jianhua He, Zuoyin Tang, Timothy O'Farrell, Thomas M. Chen:
  Performance analysis of DSRC priority mechanism for road safety applications in vehicular networks. 980-990

Volume 11, Number 8, August 2011

Wireless Monitoring and Control

• 
  Yang Xiao, Hongmei Julia Deng, Youxian Sun, Jiming Chen:
  Wireless monitoring and control. 991-993
• 
  Mingming Lu, Jie Wu:
  Localized access point selection in infrastructure wireless LANs with performance guarantee. 994-1010
• 
  Sajal K. Das, Ajoy Kumar Datta, Maria Gradinariu Potop-Butucaru, Rajesh Patel, Ai Yamazaki:
  Self-stabilizing minimum connected covers of query regions in sensor networks. 1011-1029
• 
  Mario O. Diaz, Kin K. Leung:
  Efficient data aggregation and transport in wireless sensor networks. 1030-1041
• 
  Jelena V. Misic, Vojislav B. Misic:
  Cognitive wireless personal area network for monitoring and control. 1042-1050
• 
  Yingchang Xiang, Kai Xing, Wei Cheng, E. K. Park, Shmuel Rotenstreich:
  Distributed virtual backbone construction in sensor networks with asymmetric links. 1051-1060
• 
  Naixue Xiong, Yan Yang, Jong Hyuk Park, Athanasios V. Vasilakos, Xuefeng Yan, Yi Pan:
  Self-stabilizing flocking of a group of mobile robots with memory corruption. 1061-1072
• 
  Raja Jurdak, Antonio G. Ruzzelli, Alessio Barbirato, Samuel Boivineau:
  Octopus: monitoring, visualization, and control of sensor networks. 1073-1091
• 
  Ming Li, John Harris, Min Chen, Shiwen Mao, Yang Xiao, Walter Read, B. Prabhakaran:
  Architecture and protocol design for a pervasive robot swarm communication networks. 1092-1106
• 
  Bo Yu, Yang Shi, Yang Lin:
  Discrete-time &equation image; output tracking control of wireless networked control systems with Markov communication models. 1107-1116
• 
  Jun Xiao, Naixue Xiong, Athanasios V. Vasilakos, Yi Pan:
  Effective monitoring and control - centralized schemes in third generation router based WiMAX mesh network. 1117-1126
• 
  Rong Yu, Yan Zhang, Ruchao Gao, Lingyang Song:
  Sleeping management for scalable topology control in wireless sensor networks. 1127-1139
• 
  Ghalib A. Shah, Muslim Bozyigit, Faisal Bashir Hussain:
  Cluster-based coordination and routing framework for wireless sensor and actor networks. 1140-1154
• 
  Tamer A. ElBatt, Timothy Andersen:
  A cross-layer framework for multiple access and routing design in wireless multi-hop networks. 1155-1167
• 
  Yinying Yang, Arny Ambrose, Mihaela Cardei:
  Coverage for composite event detection in wireless sensor networks. 1168-1181
• 
  Ramya Raghavendra, Prashanth Aravinda Kumar Acharya, Elizabeth M. Belding, Kevin C. Almeroth:
  MeshMon: a multi-tiered framework for wireless mesh network monitoring. 1182-1196
• 
  Wei Liang, Xiaoling Zhang, Yang Xiao, Fuqiang Wang, Peng Zeng, Haibin Yu:
  Survey and experiments of WIA-PA specification of industrial wireless network. 1197-1212

Volume 11, Number 9, September 2011

Research Articles

• 
  Padma Mundur, Sookyoung Lee, Matthew Seligman:
  Routing in intermittent networks using storage domains. 1213-1225
• 
  Miguel González-López, Francisco J. Vázquez-Araújo, Luis Castedo, Javier Garcia-Frías:
  SCLDGM coded modulation for MIMO systems with spatial multiplexing and space-time block codes. 1226-1238
• 
  Anthony Plummer Jr., Subir Biswas:
  Distributed spectrum assignment for cognitive networks with heterogeneous spectrum opportunities. 1239-1253
• 
  Quang-Dung Ho, Mohamed Ashour, Tho Le-Ngoc:
  Opportunistic delay-margin-based resource allocation for next-generation wireless networks. 1254-1265
• 
  Peng Gong, Ning Cao, Duk Kyung Kim:
  Reducing computational complexity using transmitter correlation value-assisted schedulers in multiuser MIMO uplink. 1266-1274
• 
  Hyukjin Lee, Cheng-Chew Lim, Jinho Choi:
  A refined MAC protocol with multipacket reception for wireless networks. 1275-1286
• 
  Chyi-Ren Dow, Pei-Jung Lin, S. C. Chen, Shiow-Fen Hwang:
  An efficient anycast scheme for discovering k services in cluster-based mobile ad hoc networks. 1287-1301
• 
  Xiaochen Li, Fengming Cao, Xihua Dong, Dapeng Wu:
  Power control for delay constrained multi-channel communications using outdated CSI. 1302-1311
• 
  Cheng-Han Lin, Naveen K. Chilamkurti, Sherali Zeadally, Ce-Kuen Shieh:
  Performance modeling of MPEG-4 video streaming over IEEE 802.11 using distribution coordination function. 1312-1322

Volume 11, Number 10, October 2011

Research Articles

• 
  Jianping An, Tao Jiang, Xiangming Li, Anxin Li, Hidetoshi Kayama:
  Efficient multiplicity calculation for algebraic soft-decision decoding of Reed - Solomon codes. 1323-1330
• 
  Deng Liao, Ahmed K. Elhakeem:
  Cross-layer optimization for CDMA/TDD wireless mesh networks. 1331-1340
• 
  Jenn-Wei Lin, Yi-Ting Chen:
  Local replacement for route recovery on a collaborative mobile ad hoc network. 1341-1357
• 
  Jee-Hoon Kim, Athanasios V. Vasilakos, Hyoung-Kyu Song:
  Bandwidth- efficient space-time coded cooperation for resource-constrained networks. 1358-1365
• 
  Yen-Cheng Chen, Shu-Chuan Chuang, Lo-Yao Yeh, Jiun-Long Huang:
  A practical authentication protocol with anonymity for wireless access networks. 1366-1375
• 
  Elena López-Aguilera, Jordi Casademont, Eduard Garcia Villegas:
  A study on the influence of transmission errors on WLAN IEEE 802.11 MAC performance. 1376-1391
• 
  Show-Shiow Tzeng, Hsin-Yi Lu:
  QoS provisioning for multiple non-real-time services in cellular wireless networks. 1392-1405
• 
  Xiaofan He, Tao Jiang, Guangxi Zhu:
  A novel simplified tone reservation combined with cross antenna rotation and inversion to reduce PAPR for MIMO-OFDM system. 1406-1414
• 
  Qinghua Shi, Yi Gong, Yong Liang Guan:
  Modulation classification for asynchronous high-order QAM signals. 1415-1422
• 
  Sangmin Oh, Chae Y. Lee:
  Dynamic hybrid duplex for rate maximization in OFDMA. 1423-1432

Volume 11, Number 11, November 2011

• 
  Daxin Tian, Victor C. M. Leung:
  Analysis of broadcasting delays in vehicular ad hoc networks. 1433-1445
• 
  Oscar Esparza, Jose L. Muñoz, Joan Tomàs-Buliart, Miguel Soriano:
  An infrastructure for detecting and punishing malicious hosts using mobile agent watermarking. 1446-1462
• 
  Jan Sykora, Milan Knize:
  Linear diversity precoding design criterion for finite block-fading parallel MIMO channels. 1463-1472
• 
  Xiaochen Li, Xihua Dong, Dapeng Wu:
  Hierarchical queue-length-aware power control for real-time applications over wireless networks. 1473-1484

Research Article

• 
  Qing Wang, Dapeng Wu, Pingyi Fan:
  Effective capacity of a correlated Rayleigh fading channel. 1485-1494

Volume 11, Number 12, December 2011

Special issue on the selected papers of IWCMC 2011

• 
  Xuemin (Sherman) Shen, Nei Kato, Ping Wang:
  Special issue on the selected papers of IWCMC'11. 1495-1496
• 
  Omar I. Alsaleh, Pavithra Venkatraman, Bechir Hamdaoui, Alan Fern:
  Enabling opportunistic and dynamic spectrum access through learning techniques. 1497-1506
• 
  Osman N. C. Yilmaz, Jyri Hämäläinen, Seppo Hämäläinen:
  Self-optimization of random access channel in 3rd Generation Partnership Project Long Term Evolution. 1507-1517
• 
  Boyu Li, Ender Ayanoglu:
  Reduced complexity sphere decoding. 1518-1527
• 
  Hina Tabassum, Zaher Dawy, Mohamed-Slim Alouini:
  Resource allocation via sum-rate maximization in the uplink of multi-cell OFDMA networks. 1528-1539
• 
  Hassan Moradi, Hazem H. Refai, Peter G. LoPresti, Mohammed Atiquzzaman:
  Mobile free space optic nodes in single-input multiple-output setup under transmitter misalignment. 1540-1550
• 
  Fumiyuki Adachi, Kazuki Takeda, Tetsuya Yamamoto, Ryusuke Matsukawa, Shinya Kumagai:
  Recent advances in single-carrier distributed antenna network. 1551-1563
• 
  Leonardo Jiménez Rodríguez, Nghi H. Tran, Tho Le-Ngoc:
  Multiple-frame precoding and multi-D mapping for BICM over ergodic NAF relay channels. 1564-1575
• 
  Bahador Amiri, Hamid R. Sadjadpour, Jose Joaquin Garcia-Luna-Aceves:
  Cross-layer design of outage optimum routing metric for wireless ad hoc networks. 1576-1587
• 
  Wooseong Kim, Mario Gerla, Soon-Young Oh, Kevin C. Lee, Andreas J. Kassler:
  CoRoute: a new cognitive anypath vehicular routing protocol. 1588-1602
• 
  Xu Li, Shuo Yan, Chendong Xu, Amiya Nayak, Ivan Stojmenovic:
  Localized delay-bounded and energy-efficient data aggregation in wireless sensor and actor networks. 1603-1617
• 
  Muhammad Usman Sheikh, Jukka Lempiäinen:
  Assessment of smart traffic handling scheme in multimode multiband cellular network. 1618-1627
• 
  Herman Sahota, Ratnesh Kumar, Ahmed E. Kamal:
  A wireless sensor network for precision agriculture and its performance. 1628-1645
• 
  Xuedong Liang, Min Chen, Victor C. M. Leung:
  A game-theoretic approach for relay assignment over distributed wireless networks. 1646-1656
• 
  Konstantinos Katsaros, Ralf Kernchen, Mehrdad Dianati, David Rieck, Charalambos Zinoviou:
  Application of vehicular communications for improving the efficiency of traffic in urban areas. 1657-1667
• 
  Jelena V. Misic, Vojislav B. Misic, Serkan Öztürk:
  Performance of simple cognitive personal area networks with finite buffers and adaptive superframe duration. 1668-1676
• 
  Fadi M. Al-Turjman, Hossam S. Hassanein, Waleed Alsalih, Mohamed Ibnkahla:
  Optimized relay placement for wireless sensor networks federation in environmental applications. 1677-1688
• 
  Nadia Haddadou, Abderrezak Rachedi, Yacine Ghamri-Doudane:
  Modeling and performance evaluation of Advanced Diffusion with Classified Data in vehicular sensor networks. 1689-1701