Pub Date : 1996-02-19DOI: 10.1109/ICPWC.1996.493339
R. Prasad, J. Nijhof, H. I. Çakil
A novel hybrid TDMA/CDMA multiple access protocol for multi-media communications is proposed. Its performance in terms of throughput, delay and spectrum efficiency is evaluated using computer simulation. Voice, and variable bit rate data traffic are integrated within one TDMA frame through a movable-boundary structure. Combined with DS-CDMA a new hybrid multiple access protocol is investigated that is capable of integrating different types of traffic and also gives us the capacity and flexibility of the CDMA protocol.
{"title":"Hybrid TDMA/CDMA multiple access protocol for multi-media communications","authors":"R. Prasad, J. Nijhof, H. I. Çakil","doi":"10.1109/ICPWC.1996.493339","DOIUrl":"https://doi.org/10.1109/ICPWC.1996.493339","url":null,"abstract":"A novel hybrid TDMA/CDMA multiple access protocol for multi-media communications is proposed. Its performance in terms of throughput, delay and spectrum efficiency is evaluated using computer simulation. Voice, and variable bit rate data traffic are integrated within one TDMA frame through a movable-boundary structure. Combined with DS-CDMA a new hybrid multiple access protocol is investigated that is capable of integrating different types of traffic and also gives us the capacity and flexibility of the CDMA protocol.","PeriodicalId":117877,"journal":{"name":"1996 IEEE International Conference on Personal Wireless Communications Proceedings and Exhibition. Future Access","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125948015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-02-19DOI: 10.1109/ICPWC.1996.493324
R. Westerveld
Many new satellite communications systems have been announced. The expectation is raised, that these systems will also contribute to the solution of rural telecommunication problems. In this paper a critical review is given regarding technology, cost and application of these systems in a rural environment in developing countries.
{"title":"The role of future satellite systems for rural communications","authors":"R. Westerveld","doi":"10.1109/ICPWC.1996.493324","DOIUrl":"https://doi.org/10.1109/ICPWC.1996.493324","url":null,"abstract":"Many new satellite communications systems have been announced. The expectation is raised, that these systems will also contribute to the solution of rural telecommunication problems. In this paper a critical review is given regarding technology, cost and application of these systems in a rural environment in developing countries.","PeriodicalId":117877,"journal":{"name":"1996 IEEE International Conference on Personal Wireless Communications Proceedings and Exhibition. Future Access","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131407475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-02-19DOI: 10.1109/ICPWC.1996.493323
D. Anvekar, P. Agrawal, Tejaskumar R. Patel
Two variations of a generic architecture of fixed cellular rural network suitable for rural applications in developing countries are presented. Performance evaluation of the two architectures in terms of call blocking probability is carried out by using a simulation model of the networks. It is shown by simulation results that a combination of wired and wireless networks with channel borrowing for intervillage call traffic results in lower call blocking probability.
{"title":"Fixed cellular rural networks in developing countries: a performance evaluation","authors":"D. Anvekar, P. Agrawal, Tejaskumar R. Patel","doi":"10.1109/ICPWC.1996.493323","DOIUrl":"https://doi.org/10.1109/ICPWC.1996.493323","url":null,"abstract":"Two variations of a generic architecture of fixed cellular rural network suitable for rural applications in developing countries are presented. Performance evaluation of the two architectures in terms of call blocking probability is carried out by using a simulation model of the networks. It is shown by simulation results that a combination of wired and wireless networks with channel borrowing for intervillage call traffic results in lower call blocking probability.","PeriodicalId":117877,"journal":{"name":"1996 IEEE International Conference on Personal Wireless Communications Proceedings and Exhibition. Future Access","volume":"23 14","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134411331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-02-19DOI: 10.1109/ICPWC.1996.493341
Young-il Kim, Kyoung-Joon Lee, Y. Chin
In this paper, we suggest a velocity adaptive handoff algorithm that determines the handoff threshold value according to the velocity of mobile, and analyze the effect of this new algorithm. Also we analyze the traffic characteristics in a micro/macro overlaid CDMA PCS system where voice and data channels are processed separately. Handoff procedure is the important parameter for evaluating PCS systems. For this, we calculated inter-microcell handoff area dwelling time distribution and micro/macrocell handoff area dwelling time distribution. Using these results and a M/M/C/K model, we analyzed the traffic performance of macrocells with handoff area variation of microcells. Simulation results show that the blocking probability of microcells and macrocells depends on the handoff area variation.
{"title":"Effect of handoff area variation on PCS system traffic","authors":"Young-il Kim, Kyoung-Joon Lee, Y. Chin","doi":"10.1109/ICPWC.1996.493341","DOIUrl":"https://doi.org/10.1109/ICPWC.1996.493341","url":null,"abstract":"In this paper, we suggest a velocity adaptive handoff algorithm that determines the handoff threshold value according to the velocity of mobile, and analyze the effect of this new algorithm. Also we analyze the traffic characteristics in a micro/macro overlaid CDMA PCS system where voice and data channels are processed separately. Handoff procedure is the important parameter for evaluating PCS systems. For this, we calculated inter-microcell handoff area dwelling time distribution and micro/macrocell handoff area dwelling time distribution. Using these results and a M/M/C/K model, we analyzed the traffic performance of macrocells with handoff area variation of microcells. Simulation results show that the blocking probability of microcells and macrocells depends on the handoff area variation.","PeriodicalId":117877,"journal":{"name":"1996 IEEE International Conference on Personal Wireless Communications Proceedings and Exhibition. Future Access","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129314515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-02-19DOI: 10.1109/ICPWC.1996.494263
L. Ortigoza-Guerrero, D. Lara-Rodríguez
An interference limited environment is proposed for the evaluation of channel assignment strategies for digital systems based in the IS-54 standard. This environment consists of two rings of co-channel interference cells (133 cells) with uniform and nonuniform traffic distribution. At call initiation the C/I ratio is evaluated. A minimum C/I value in dB is required for attending a call, otherwise, the call is rejected. The propagation model takes into account log normal shadowing losses. The nonuniform traffic distribution is the real traffic distribution in the system of one of the two cellular companies of Mexico City. Results are presented for fixed channel assignment (FCA), borrowing with channel ordering (BCO), borrowing with directional channel-locking (BDCL) and the compact pattern based dynamic channel assignment (CP) strategy. In order to evaluate these strategies in the new digital cellular system, some modifications and combinations with different time slot assignment techniques were used. In the proposed interference limited environment the borrowing with directional channel-locking strategy gave better results with both uniform and nonuniform traffic distribution cases when the AMPS standard was used. However, borrowing with channel ordering outperforms all the other strategies when the IS-54 standard was used.
{"title":"Evaluation of channel assignment strategies for TIA IS-54 system","authors":"L. Ortigoza-Guerrero, D. Lara-Rodríguez","doi":"10.1109/ICPWC.1996.494263","DOIUrl":"https://doi.org/10.1109/ICPWC.1996.494263","url":null,"abstract":"An interference limited environment is proposed for the evaluation of channel assignment strategies for digital systems based in the IS-54 standard. This environment consists of two rings of co-channel interference cells (133 cells) with uniform and nonuniform traffic distribution. At call initiation the C/I ratio is evaluated. A minimum C/I value in dB is required for attending a call, otherwise, the call is rejected. The propagation model takes into account log normal shadowing losses. The nonuniform traffic distribution is the real traffic distribution in the system of one of the two cellular companies of Mexico City. Results are presented for fixed channel assignment (FCA), borrowing with channel ordering (BCO), borrowing with directional channel-locking (BDCL) and the compact pattern based dynamic channel assignment (CP) strategy. In order to evaluate these strategies in the new digital cellular system, some modifications and combinations with different time slot assignment techniques were used. In the proposed interference limited environment the borrowing with directional channel-locking strategy gave better results with both uniform and nonuniform traffic distribution cases when the AMPS standard was used. However, borrowing with channel ordering outperforms all the other strategies when the IS-54 standard was used.","PeriodicalId":117877,"journal":{"name":"1996 IEEE International Conference on Personal Wireless Communications Proceedings and Exhibition. Future Access","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128099261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-02-19DOI: 10.1109/ICPWC.1996.494286
S. Garg, V. Kansal
The paper is an insight into a personal communication service network using a geo-synchronous orbit satellite having regional coverage which can be seamlessly extended. The system is a line-of-sight communication system. The basic concepts and the major components of the system are depicted. The network is an access network. It relies on the public switched telephone network (PSTN) and the public land mobile networks (PLMN) to complete end-to-end services. The network provides single hop call connectivity for mobile-to-PSTN and mobile-to-mobile calls. It can penetrate extremely isolated areas where the terrestrial PSTN and PLMN cannot. The network, together with its inter-working features of terrestrial cellular system provides a seamless network of universal mobile communication.
本文对利用地球同步轨道卫星实现区域覆盖无缝扩展的个人通信服务网络进行了深入研究。该系统是视距通信系统。介绍了系统的基本概念和主要组成部分。该网络为接入网。它依靠PSTN (public switched telephone network)和PLMN (public land mobile network)完成端到端业务。该网络提供移动到pstn和移动到移动的单跳呼叫连接。它可以穿透地面PSTN和PLMN无法穿透的极其孤立的区域。该网络结合地面蜂窝系统的互通特性，提供了一个通用移动通信的无缝网络。
{"title":"Cost effective personal communications using geo-synchronous satellite","authors":"S. Garg, V. Kansal","doi":"10.1109/ICPWC.1996.494286","DOIUrl":"https://doi.org/10.1109/ICPWC.1996.494286","url":null,"abstract":"The paper is an insight into a personal communication service network using a geo-synchronous orbit satellite having regional coverage which can be seamlessly extended. The system is a line-of-sight communication system. The basic concepts and the major components of the system are depicted. The network is an access network. It relies on the public switched telephone network (PSTN) and the public land mobile networks (PLMN) to complete end-to-end services. The network provides single hop call connectivity for mobile-to-PSTN and mobile-to-mobile calls. It can penetrate extremely isolated areas where the terrestrial PSTN and PLMN cannot. The network, together with its inter-working features of terrestrial cellular system provides a seamless network of universal mobile communication.","PeriodicalId":117877,"journal":{"name":"1996 IEEE International Conference on Personal Wireless Communications Proceedings and Exhibition. Future Access","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114377320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-02-19DOI: 10.1109/ICPWC.1996.493336
A. Johansson, T. Ottosson, A. Svensson
Second generation digital mobile telephone systems have been in public use for several years. Research is now focusing on third generation systems. These are generally referred to as personal communications networks (PCN), universal mobile telecommunication systems (UMTS) or future public land mobile telecommunication systems (FPLMTS). Different modulation schemes supporting multiple data rates in a direct sequence code division multiple access (DS/CDMA) system are studied. A successive multistage interference cancellation scheme for the considered modulations is described. Bit error probability on both AWGN and Rayleigh fading channels are presented both with single user detection and with multistage interference cancellation. It is shown that DS/CDMA is very flexible in supporting multiple data rates for wireless multimedia applications and that significantly improved performance may be obtained using interference cancellation.
{"title":"On multirate DS/CDMA with interference cancellation for wireless multimedia applications","authors":"A. Johansson, T. Ottosson, A. Svensson","doi":"10.1109/ICPWC.1996.493336","DOIUrl":"https://doi.org/10.1109/ICPWC.1996.493336","url":null,"abstract":"Second generation digital mobile telephone systems have been in public use for several years. Research is now focusing on third generation systems. These are generally referred to as personal communications networks (PCN), universal mobile telecommunication systems (UMTS) or future public land mobile telecommunication systems (FPLMTS). Different modulation schemes supporting multiple data rates in a direct sequence code division multiple access (DS/CDMA) system are studied. A successive multistage interference cancellation scheme for the considered modulations is described. Bit error probability on both AWGN and Rayleigh fading channels are presented both with single user detection and with multistage interference cancellation. It is shown that DS/CDMA is very flexible in supporting multiple data rates for wireless multimedia applications and that significantly improved performance may be obtained using interference cancellation.","PeriodicalId":117877,"journal":{"name":"1996 IEEE International Conference on Personal Wireless Communications Proceedings and Exhibition. Future Access","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130918349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-02-19DOI: 10.1109/ICPWC.1996.494261
A. Hác
The switching network consists of a number of switches connected by trunks. The wireless network is built of base stations connected to switches. A call from a mobile user is set up through a base station and a number of switches. A switch has the input queue for the source and the output queue. The packets are held in the input queue if the output queue in the switch is full. The input queue is a buffer that holds the packets if the required bandwidth exceeds the available bandwidth. The switch design allows for collision free packet transfer between the input and the output queue. A variable buffer is employed based upon the protocol carried, with a priority technique used to service time sensitive protocols. A multiplexing mechanism is used to allow other protocols to enter the queue during time-outs. This paper proposes a call processing model for wireless networks. Wireless communication can cause congestion in high-speed switching networks depending on the volume of calls, their origination and the network architecture. In congested areas where wireless services are extensively used, the switching network can become congested. In addition, the quality of wireless communication can decrease because of the frequency range that allows for limited number of calls made within the cell. The call processing model allows for evaluation of those limitations and for choosing the best possible solution.
{"title":"Call processing model for wireless network","authors":"A. Hác","doi":"10.1109/ICPWC.1996.494261","DOIUrl":"https://doi.org/10.1109/ICPWC.1996.494261","url":null,"abstract":"The switching network consists of a number of switches connected by trunks. The wireless network is built of base stations connected to switches. A call from a mobile user is set up through a base station and a number of switches. A switch has the input queue for the source and the output queue. The packets are held in the input queue if the output queue in the switch is full. The input queue is a buffer that holds the packets if the required bandwidth exceeds the available bandwidth. The switch design allows for collision free packet transfer between the input and the output queue. A variable buffer is employed based upon the protocol carried, with a priority technique used to service time sensitive protocols. A multiplexing mechanism is used to allow other protocols to enter the queue during time-outs. This paper proposes a call processing model for wireless networks. Wireless communication can cause congestion in high-speed switching networks depending on the volume of calls, their origination and the network architecture. In congested areas where wireless services are extensively used, the switching network can become congested. In addition, the quality of wireless communication can decrease because of the frequency range that allows for limited number of calls made within the cell. The call processing model allows for evaluation of those limitations and for choosing the best possible solution.","PeriodicalId":117877,"journal":{"name":"1996 IEEE International Conference on Personal Wireless Communications Proceedings and Exhibition. Future Access","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130979984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-02-19DOI: 10.1109/ICPWC.1996.494257
Eunyong Ha, Yanghee Choi, Chongsang Kim
A picocellular network consists of picocells whose radius is of the order of ten meters. This small cell radius causes frequent cell movements of mobile hosts. In order to support seamless communication service to mobile users, we need a new handoff scheme. In this paper, we propose a multicast-based pre-handoff scheme which minimizes buffer overhead for seamless communication service as well as handoff delay. We call this scheme sub-group buffering handoff scheme (SGHS).
{"title":"A new pre-handoff scheme for picocellular networks","authors":"Eunyong Ha, Yanghee Choi, Chongsang Kim","doi":"10.1109/ICPWC.1996.494257","DOIUrl":"https://doi.org/10.1109/ICPWC.1996.494257","url":null,"abstract":"A picocellular network consists of picocells whose radius is of the order of ten meters. This small cell radius causes frequent cell movements of mobile hosts. In order to support seamless communication service to mobile users, we need a new handoff scheme. In this paper, we propose a multicast-based pre-handoff scheme which minimizes buffer overhead for seamless communication service as well as handoff delay. We call this scheme sub-group buffering handoff scheme (SGHS).","PeriodicalId":117877,"journal":{"name":"1996 IEEE International Conference on Personal Wireless Communications Proceedings and Exhibition. Future Access","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114609402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-02-19DOI: 10.1109/ICPWC.1996.493320
A. Viterbi
Three fundamental requirements of the physical layer of mobile multiple access communication systems are described. It is shown that spread spectrum CDMA systems are best suited to fulfilling these requirements.
描述了移动多址通信系统物理层的三个基本要求。研究表明，扩频CDMA系统最适合满足这些要求。
{"title":"A fresh look at the physical layer of terrestrial mobile multiple access networks","authors":"A. Viterbi","doi":"10.1109/ICPWC.1996.493320","DOIUrl":"https://doi.org/10.1109/ICPWC.1996.493320","url":null,"abstract":"Three fundamental requirements of the physical layer of mobile multiple access communication systems are described. It is shown that spread spectrum CDMA systems are best suited to fulfilling these requirements.","PeriodicalId":117877,"journal":{"name":"1996 IEEE International Conference on Personal Wireless Communications Proceedings and Exhibition. Future Access","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121761604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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