Quality of service models for heterogeneous networks: overview and challenges

The proliferation and convergence of different types of wired, wireless and mobile networks (such as WiMAX, Wireless Mesh Networks, WPANs, WLANs, etc) and cellular-based networks are crucial for the success of next-generation networks. Traditional wired/wireless networks can hardly meet the requirements of future integrated-service networks which are expected to carry multimedia traffic with various quality of service (QoS) requirements. Therefore, it is necessary to develop efficient global control mechanisms that can maintain QoS requirements to maximize network resources utilization, and minimize operational costs on all the types of wireless mobile networks. In this paper, we present an overview of QoS paradigms for heterogeneous networks and focus on those based on deterministic and probabilistic QoS.

[1]  David S. Johnson,et al.  Computers and Intractability: A Guide to the Theory of NP-Completeness , 1978 .

[2]  Jeffrey M. Jaffe,et al.  Algorithms for finding paths with multiple constraints , 1984, Networks.

[3]  Dinesh C. Verma,et al.  A Scheme for Real-Time Channel Establishment in Wide-Area Networks , 1990, IEEE J. Sel. Areas Commun..

[4]  James R. Davin,et al.  A simulation study of fair queueing and policy enforcement , 1990, CCRV.

[5]  Lixia Zhang,et al.  Virtual Clock: A New Traffic Control Algorithm for Packet Switching Networks , 1990, SIGCOMM.

[6]  Hui Zhang,et al.  Comparison of rate-based service disciplines , 1991, SIGCOMM '91.

[7]  Abhay Parekh,et al.  A generalized processor sharing approach to flow control in integrated services networks: the single-node case , 1993, TNET.

[8]  Hector Garcia-Molina,et al.  Deadline assignment in a distributed soft real-time system , 1993, [1993] Proceedings. The 13th International Conference on Distributed Computing Systems.

[9]  Domenico Ferrari,et al.  Rate-controlled static-priority queueing , 1993, IEEE INFOCOM '93 The Conference on Computer Communications, Proceedings.

[10]  John A. Clark,et al.  Holistic schedulability analysis for distributed hard real-time systems , 1994, Microprocess. Microprogramming.

[11]  Scott Shenker,et al.  Integrated Services in the Internet Architecture : an Overview Status of this Memo , 1994 .

[12]  Hector Garcia-Molina,et al.  Subtask deadline assignment for complex distributed soft real-time tasks , 1994, 14th International Conference on Distributed Computing Systems.

[13]  John A. Stankovic,et al.  Dynamic end-to-end guarantees in distributed real time systems , 1994, 1994 Proceedings Real-Time Systems Symposium.

[14]  Domenico Ferrari,et al.  Rate-Controlled Service Disciplines , 1994, J. High Speed Networks.

[15]  Harrick M. Vin,et al.  Start-time fair queueing: a scheduling algorithm for integrated services packet switching networks , 1996, SIGCOMM 1996.

[16]  Marco Spuri,et al.  Preemptive and Non-Preemptive Real-Time UniProcessor Scheduling , 1996 .

[17]  Roch Guérin,et al.  Efficient network QoS provisioning based on per node traffic shaping , 1996, TNET.

[18]  Kris Steenhaut,et al.  Scheduling and admission control policies: A case study for ATM , 1997, Comput. Networks ISDN Syst..

[19]  Lixia Zhang,et al.  Resource ReSerVation Protocol (RSVP) - Version 1 Functional Specification , 1997, RFC.

[20]  Harrick M. Vin,et al.  Start-time fair queueing: a scheduling algorithm for integrated services packet switching networks , 1997, TNET.

[21]  Saragur M. Srinidhi,et al.  An adaptive scheme for admission control in ATM networks , 1997, Comput. Networks ISDN Syst..

[22]  Andrew G. Barto,et al.  Reinforcement learning , 1998 .

[23]  Sartaj Sahni,et al.  Data Structures, Algorithms, and Applications in C++ , 1997 .

[24]  Andrew G. Barto,et al.  Reinforcement learning , 1998 .

[25]  David L. Black,et al.  An Architecture for Differentiated Service , 1998 .

[26]  Dilip D. Kandlur,et al.  Design and implementation of an RSVP-based quality of service architecture for an integrated services Internet , 1998, IEEE J. Sel. Areas Commun..

[27]  Vijay Sivaraman,et al.  Achieving high utilization in guaranteed services networks using early-deadline-first scheduling , 1998, 1998 Sixth International Workshop on Quality of Service (IWQoS'98) (Cat. No.98EX136).

[28]  N. Pekergin,et al.  Eligible Start-Time Fair Queuing: A New Fair Queuing Policy and its Analysis with a Stochastic Comparison Approach , 1998 .

[29]  Klara Nahrstedt,et al.  On finding multi-constrained paths , 1998, ICC '98. 1998 IEEE International Conference on Communications. Conference Record. Affiliated with SUPERCOMM'98 (Cat. No.98CH36220).

[30]  P. Thiran,et al.  A note on time and space methods in network calculus , 1998, 1998 International Zurich Seminar on Broadband Communications. Accessing, Transmission, Networking. Proceedings (Cat. No.98TH8277).

[31]  P. Van Mieghem,et al.  A multiple quality of service routing algorithm for PNNI , 1998 .

[32]  Henning Schulzrinne,et al.  YESSIR: a simple reservation mechanism for the Internet , 1999, CCRV.

[33]  Ness B. Shroff,et al.  Admission control for statistical QoS: theory and practice , 1999, IEEE Netw..

[34]  Gábor Fehér,et al.  Boomerang-A Simple Protocol for Resource Reservation in IP Networks , 1999 .

[35]  Jan Åke Jönsson,et al.  A robust adaptive metric for deadline assignment in heterogeneous distributed real-time systems , 1999 .

[36]  Daniel O. Awduche,et al.  Requirements for Traffic Engineering Over MPLS , 1999, RFC.

[37]  Van Jacobson,et al.  An Expedited Forwarding PHB , 1999, RFC.

[38]  Avideh Zakhor,et al.  Real-Time Internet Video Using Error Resilient Scalable Compression and TCP-Friendly Transport Protocol , 1999, IEEE Trans. Multim..

[39]  Andrew T. Campbell,et al.  INSIGNIA: An IP-Based Quality of Service Framework for Mobile ad Hoc Networks , 2000, J. Parallel Distributed Comput..

[40]  Hui Zhang,et al.  Endpoint admission control: architectural issues and performance , 2000, SIGCOMM 2000.

[41]  Shivkumar Kalyanaraman,et al.  TCP rate control , 2000, CCRV.

[42]  Stan Zachary,et al.  Distributed admission control , 2000, IEEE Journal on Selected Areas in Communications.

[43]  Vijay Sivaraman,et al.  Providing end-to-end statistical delay guarantees with earliest deadline first scheduling and per-hop traffic shaping , 2000, Proceedings IEEE INFOCOM 2000. Conference on Computer Communications. Nineteenth Annual Joint Conference of the IEEE Computer and Communications Societies (Cat. No.00CH37064).

[44]  Henning Schulzrinne,et al.  BGRP: Sink-tree-based aggregation for inter-domain reservations , 2000, Journal of Communications and Networks.

[45]  Antonio Capone,et al.  Throughput analysis of end-to-end measurement-based admission control in IP , 2000, Proceedings IEEE INFOCOM 2000. Conference on Computer Communications. Nineteenth Annual Joint Conference of the IEEE Computer and Communications Societies (Cat. No.00CH37064).

[46]  Vijay Sivaraman,et al.  Traffic shaping for end-to-end delay guarantees with EDF scheduling , 2000, 2000 Eighth International Workshop on Quality of Service. IWQoS 2000 (Cat. No.00EX400).

[47]  Yoram Bernet,et al.  Format of the RSVP DCLASS Object , 2000, RFC.

[48]  Jean-Yves Le Boudec,et al.  Delay Bounds in a Network with Aggregate Scheduling , 2000, QofIS.

[49]  Gunnar Karlsson,et al.  Admission control based on end-to-end measurements , 2000, Proceedings IEEE INFOCOM 2000. Conference on Computer Communications. Nineteenth Annual Joint Conference of the IEEE Computer and Communications Societies (Cat. No.00CH37064).

[50]  Edward W. Knightly,et al.  Egress admission control , 2000, Proceedings IEEE INFOCOM 2000. Conference on Computer Communications. Nineteenth Annual Joint Conference of the IEEE Computer and Communications Societies (Cat. No.00CH37064).

[51]  Mario Gerla,et al.  Resource Allocation and Admission Control Styles in QoS DiffServ Networks , 2001, Quality of Service in Multiservice IP Networks.

[52]  Marwan Krunz,et al.  A randomized algorithm for finding a path subject to multiple QoS requirements , 2001, Comput. Networks.

[53]  Anis Koubaa,et al.  Upper Bound Evaluation of Response Time For Real-Time Communication , 2001 .

[54]  Simone Redana,et al.  Call admission control techniques for UMTS , 2001, IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211).

[55]  Gianluca Reali,et al.  Resource Allocation and Admission Control Styles in QoS DiffServ Networks , 2001, QoS-IP.

[56]  Alpár Jüttner,et al.  Lagrange relaxation based method for the QoS routing problem , 2001, Proceedings IEEE INFOCOM 2001. Conference on Computer Communications. Twentieth Annual Joint Conference of the IEEE Computer and Communications Society (Cat. No.01CH37213).

[57]  Ramjee Prasad,et al.  Quality of service among IP-based heterogeneous networks , 2001, IEEE Wirel. Commun..

[58]  Laurent George,et al.  First Come First Served: Some Results for Real-Time Scheduling , 2001, ISCA PDCS.

[59]  H. Aghvami,et al.  RSVP extensions for real-time services in wireless mobile networks , 2001, IEEE Commun. Mag..

[60]  Sudhir Dixit,et al.  Resource management and quality of service in third-generation wireless networks , 2001, IEEE Commun. Mag..

[61]  Vijay Sivaraman,et al.  End-to-end statistical delay service under GPS and EDF scheduling: a comparison study , 2001, Proceedings IEEE INFOCOM 2001. Conference on Computer Communications. Twentieth Annual Joint Conference of the IEEE Computer and Communications Society (Cat. No.01CH37213).

[62]  B. R. Badrinath,et al.  MRSVP: A Resource Reservation Protocol for an Integrated Services Network with Mobile Hosts , 2001, Wirel. Networks.

[63]  Vijay Srinivasan,et al.  RSVP-TE: Extensions to RSVP for LSP Tunnels , 2001, RFC.

[64]  Jean-Yves Le Boudec,et al.  Delay jitter bounds and packet scale rate guarantee for expedited forwarding , 2001, Proceedings IEEE INFOCOM 2001. Conference on Computer Communications. Twentieth Annual Joint Conference of the IEEE Computer and Communications Society (Cat. No.01CH37213).

[65]  Jean-Yves Le Boudec,et al.  Delay jitter bounds and packet scale rate guarantee for expedited forwarding , 2002, TNET.

[66]  Zhang Ping,et al.  Call admission control in hierarchical cell structure , 2002, Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367).

[67]  K. K. Ramakrishnan,et al.  Explicit window adaptation: a method to enhance TCP performance , 2002, TNET.

[68]  Bin Wang,et al.  Bandwidth degradation QoS provisioning for adaptive multimedia in wireless/mobile networks , 2002, Comput. Commun..

[69]  Bo Li,et al.  A dynamic call admission policy with precision QoS guarantee using stochastic control for mobile wireless networks , 2002, TNET.

[70]  Preben E. Mogensen,et al.  Directional power-based admission control for WCDMA systems using beamforming antenna array systems , 2002, IEEE Trans. Veh. Technol..

[71]  Charles Shen.  Mobility Extensions to RSVP in an RSVP-Mobile IPv6 Framework , 2002 .

[72]  Erol Gelenbe,et al.  Networking with Cognitive Packets , 2002, ICANN.

[73]  Robert Braden,et al.  A Two-Level Architecture for Internet Signaling , 2002 .

[74]  Sunghyun Choi,et al.  QoS Signaling for Parameterized Traffic in IEEE 802.11e Wireless LANs , 2002, AISA.

[75]  Albert Banchs,et al.  Providing throughput guarantees in IEEE 802.11 wireless LAN , 2002, 2002 IEEE Wireless Communications and Networking Conference Record. WCNC 2002 (Cat. No.02TH8609).

[76]  Fredrik Gunnarsson,et al.  Uplink admission control in WCDMA based on relative load estimates , 2002, 2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333).

[77]  Eleanor Hepworth,et al.  Provision of QoS in heterogeneous wireless IP access networks , 2002, The 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.

[78]  Imrich Chlamtac,et al.  An all-IP approach for UMTS third-generation mobile networks , 2002 .

[79]  Michael Thomas.  Analysis of Mobile IP and RSVP Interactions , 2002 .

[80]  Qian Zhang,et al.  Efficient mobility management for vertical handoff between WWAN and WLAN , 2003, IEEE Commun. Mag..

[81]  F. Palacio,et al.  Capacity analysis and performance evaluation of call admission control for multimedia packet transmission in UMTS WCDMA system , 2003, 2003 IEEE Wireless Communications and Networking, 2003. WCNC 2003..

[82]  Jukka Manner,et al.  Localized QoS Management for Multimedia Applications in Wireless Access Networks , 2003 .

[83]  Dharma P. Agrawal,et al.  Performance Analysis of a Preemptive and Priority Reservation Handoff Scheme for Integrated Service-Based Wireless Mobile Networks , 2003, IEEE Trans. Mob. Comput..

[84]  Rui L. Aguiar,et al.  An IP-based QoS architecture for 4G operator scenarios , 2003, IEEE Wirel. Commun..

[85]  Laurent George,et al.  Deterministic End-to-End Guarantees for Real-Time Applications in a DiffServ-MPLS Domain , 2003, SERA.

[86]  J. Antonio García-Macías,et al.  Quality of Service and Mobility for the Wireless Internet , 2003, Wirel. Networks.

[87]  Kee Chaing Chua,et al.  Policy-based QoS-management architecture in an integrated UMTS and WLAN environment , 2003, IEEE Commun. Mag..

[88]  Dervis Z. Deniz,et al.  Performance of CAC strategies for multimedia traffic in wireless networks , 2003, IEEE J. Sel. Areas Commun..

[89]  Lou Berger,et al.  Generalized Multi-Protocol Label Switching (GMPLS) Signaling Resource ReserVation Protocol-Traffic Engineering (RSVP-TE) Extensions , 2003, RFC.

[90]  Mário Serafim Nunes,et al.  Integration of IP mobility and QoS for heterogeneous wireless access in MOICANE , 2003, 14th IEEE Proceedings on Personal, Indoor and Mobile Radio Communications, 2003. PIMRC 2003..

[91]  Anders Eriksson,et al.  Providing quality of service in always best connected networks , 2003, IEEE Commun. Mag..

[92]  Klara Nahrstedt,et al.  Dynamic Bandwidth Management for Single-Hop Ad Hoc Wireless Networks , 2003, PerCom.

[93]  Hamid Aghvami,et al.  Diffserv extensions for QoS provisioning in IP mobility environments , 2003, IEEE Wirel. Commun..

[94]  Markus Dillinger,et al.  Investigation of radio resource scheduling in WLANs coupled with 3G cellular network , 2003, IEEE Commun. Mag..

[95]  Sunghyun Choi,et al.  Collaborative QoS architecture between DiffServ and 802.11e wireless LAN , 2003, The 57th IEEE Semiannual Vehicular Technology Conference, 2003. VTC 2003-Spring..

[96]  Bin Li,et al.  Call admission control for voice/data integrated cellular networks: performance analysis and comparative study , 2004, IEEE Journal on Selected Areas in Communications.

[97]  Seung-Jae Han,et al.  Assignment strategies for mobile data users in hierarchical overlay networks: performance of optimal and adaptive strategies , 2004, IEEE Journal on Selected Areas in Communications.

[98]  Piet Van Mieghem,et al.  Performance evaluation of constraint-based path selection algorithms , 2004, IEEE Network.

[99]  Lei Huang,et al.  Adaptive resource allocation for multimedia QoS management in wireless networks , 2004, IEEE Transactions on Vehicular Technology.

[100]  Yu Cheng,et al.  Call admission control for integrated on/off voice and best-effort data services in mobile cellular communications , 2004, IEEE Transactions on Communications.

[101]  Marcus Brunner,et al.  Requirements for Signaling Protocols , 2004, RFC.

[102]  John Murphy,et al.  Novel admission control algorithm for GPRS/EGPRS based on fuzzy logic , 2004 .

[103]  Laurent George,et al.  Analysis of deadline assignment methods in distributed real-time systems , 2004, Comput. Commun..

[104]  Wen-Tsuen Chen,et al.  Architecture for mobility and QoS support in all-IP wireless networks , 2004, IEEE J. Sel. Areas Commun..

[105]  Iakovos S. Venieris,et al.  End-to-end QoS specification issues in the converged all-IP wired and wireless environment , 2004, IEEE Communications Magazine.

[106]  Imrich Chlamtac,et al.  A survey of quality of service in IEEE 802.11 networks , 2004, IEEE Wirel. Commun..

[107]  Laurent George,et al.  The Trajectory Approach for the End-to-End Response Times with Non-preemptive FP/EDF , 2004, SERA.

[108]  Jukka Manner,et al.  NSLP for Quality-of-Service signalling , 2004 .

[109]  Hamid Aghvami,et al.  Quality-of-service mechanisms in all-IP wireless access networks , 2004, IEEE Journal on Selected Areas in Communications.

[110]  Olivier Bonaventure,et al.  Open issues in interdomain routing: a survey , 2005, IEEE Network.

[111]  King Ngi Ngan,et al.  Admission control in IEEE 802.11e wireless LANs , 2005, IEEE Netw..

[112]  Wei Song,et al.  Resource management for QoS support in cellular/WLAN interworking , 2005, IEEE Network.

[113]  Yi Pan,et al.  Architecture, mobility management, and quality of service for integrated 3G and WLAN networks , 2005, Wirel. Commun. Mob. Comput..

[114]  Jianping Pan,et al.  Performance analysis of TCP-friendly AIMD algorithms for multimedia applications , 2005, IEEE Transactions on Multimedia.

[115]  Steve Uhlig,et al.  Modeling the routing of an autonomous system with C-BGP , 2005, IEEE Network.

[116]  Piet Van Mieghem,et al.  Conditions that impact the complexity of QoS routing , 2005, IEEE/ACM Transactions on Networking.

[117]  Ilias Politis,et al.  A quality of service negotiation-based admission control scheme for WCDMA mobile wireless multiclass services , 2005, IEEE Transactions on Vehicular Technology.

[118]  Xin Gang Wang,et al.  An adaptive QoS framework for integrated cellular and WLAN networks , 2005, Comput. Networks.

[119]  Apostolis K. Salkintzis,et al.  Special issue: WLAN/3G integration for next-generation heterogeneous mobile data networks , 2005, Wirel. Commun. Mob. Comput..

[120]  John Loughney,et al.  Next Steps in Signaling (NSIS): Framework , 2005, RFC.

[121]  Xiaoming Fu,et al.  Network Working Group Analysis of Existing Quality-of-service Signaling Protocols , 2005 .

[122]  Dusit Niyato,et al.  Call admission control for QoS provisioning in 4G wireless networks: issues and approaches , 2005, IEEE Network.

[123]  Laurent George,et al.  End‐to‐end response time with fixed priority scheduling: trajectory approach versus holistic approach , 2005, Int. J. Commun. Syst..

[124]  Sherali Zeadally,et al.  Design Architectures for 3G and IEEE 802.11 WLAN Integration , 2005, ICN.

[125]  Antonio Iera,et al.  802.11-Based Wireless-LAN and UMTS interworking: requirements, proposed solutions and open issue , 2005, Comput. Networks.

[126]  Chaiwat Oottamakorn,et al.  Scalable QoS Assurances with Measurement-Based Admission Control , 2005, IEICE Trans. Commun..

[127]  Timo Hämäläinen,et al.  Providing QOS in 3G-WLAN environment with RSVP and DIFFSERV , 2006, e-Business and Telecommunication Networks.

[128]  Raouf Boutaba,et al.  Call admission control in mobile cellular networks: a comprehensive survey: Research Articles , 2006 .

[129]  Jordi Domingo-Pascual,et al.  Research challenges in QoS routing , 2006, Comput. Commun..

[130]  G. Pasolini,et al.  WLAN call admission control strategies for voice traffic over integrated 3G/WLAN networks , 2006, CCNC 2006. 2006 3rd IEEE Consumer Communications and Networking Conference, 2006..

[131]  Timo Hämäläinen,et al.  Simulation Study on 3G and WLAN Inter-Working , 2006, IEICE Trans. Commun..

[132]  Shantidev Mohanty,et al.  A new architecture for 3G and WLAN integration and inter-system handover management , 2006, Wirel. Networks.

[133]  Eddie Kohler,et al.  Profile for Datagram Congestion Control Protocol (DCCP) Congestion Control ID 2: TCP-like Congestion Control , 2006, RFC.

[134]  Raouf Boutaba,et al.  Call Admission Control in Mobile Cellular Networks : A Comprehensive Survey , 2004 .

[135]  Hongqiang Zhai,et al.  Supporting QoS in IEEE 802.11e wireless LANs , 2006, IEEE Transactions on Wireless Communications.

[136]  Sartaj Sahni,et al.  Approximation algorithms for multiconstrained quality-of-service routing , 2006, IEEE Transactions on Computers.

[137]  Jon M. Peha,et al.  Mobility patterns in microcellular wireless networks , 2003, IEEE Transactions on Mobile Computing.

[138]  Dieter Hogrefe,et al.  Beyond QoS signaling: A new generic IP signaling framework , 2006, Comput. Networks.

[139]  Imrich Chlamtac,et al.  End-to-end QoS framework for heterogeneous wired-cum-wireless networks , 2006, Wirel. Networks.

[140]  Yevgeni Koucheryavy,et al.  The PFTK-model revised , 2006, Comput. Commun..

[141]  Sung-Min Oh,et al.  End-to-End QoS Guaranteed Service in WLAN and 3GPP Interworking Network , 2006, APNOMS.

[142]  Mohammad S. Obaidat,et al.  WLAN-UMTS Integration: Architecture, Seamless Handoff, and Simulation Analysis , 2006, Simul..

[143]  Sartaj Sahni,et al.  An online heuristic for maximum lifetime routing in wireless sensor networks , 2006, IEEE Transactions on Computers.

[144]  Sherali Zeadally,et al.  Enabling End-to-End QoS over Hybrid Wired-Wireless Networks , 2006, Wirel. Pers. Commun..

[145]  Vassilis Tsaoussidis,et al.  Experimenting with tau-AIMD over wireless asynchronous networks , 2006, Comput. Commun..

[146]  Jianping Pan,et al.  QoS support in Wireless/Wired networks using the TCP-Friendly AIMD protocol , 2006, IEEE Transactions on Wireless Communications.

[147]  Weihua Zhuang,et al.  Load balancing for cellular/WLAN integrated networks , 2007, IEEE Network.

[148]  Azzedine Boukerche,et al.  Quality of service based routing algorithms for heterogeneous networks [Guest editorial] , 2007, IEEE Communications Magazine.

[149]  Elizabeth M. Belding-Royer,et al.  Perceptive admission control for wireless network quality of service , 2007, Ad Hoc Networks.

[150]  Shekhar Verma,et al.  Scalable E2E Framework for Heterogeneous (Wired-cum- wireless) Networks , 2007 .

[151]  A. Mellouk,et al.  Reinforcing State-Dependent N Best Quality of Service Routes in Communication Networks , 2007, 2007 Workshop on High Performance Switching and Routing.

[152]  Dong-Ho Cho,et al.  Hybrid coupling scheme for UMTS and wireless LAN interworking , 2007 .

[153]  Rongbo Zhu,et al.  Effective CAC Scheme in IEEE 802.11e Wireless LANs , 2007, 2007 International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications.

[154]  M.C. Chan,et al.  Improving TCP/IP performance over third generation wireless networks , 2004, IEEE INFOCOM 2004.

[155]  Arif Ghafoor,et al.  A scalable call admission control algorithm , 2008, TNET.

[156]  Ekram Hossain,et al.  Efficient silence suppression and call admission control through contention-free medium access for VoIP in WiFi networks , 2008, IEEE Communications Magazine.

[157]  Said Hoceini,et al.  Reinforcing probabilistic selective Quality of Service routes in dynamic irregular networks , 2008, Comput. Commun..

[158]  Yu-Chee Tseng,et al.  Design of QoS and Admission Control for VoIP Services Over IEEE 802.11e WLANs , 2008, J. Inf. Sci. Eng..

[159]  Thomas Stützle,et al.  Ant Colony Optimization , 2009, EMO.