On channel definitions and rules for continuous dynamic channel selection in coexistence etiquettes for radio systems
08 Jun 1994-pp 809-813
TL;DR: Analysis and simulations on dynamic spectrum sharing between uncoordinated systems of the same kind or even between systems using different technologies are presented.
Abstract: Dynamic spectrum sharing between uncoordinated systems of the same kind or even between systems using different technologies is attracting an increasing interest. Closely related is also "bandwidth on demand" for different services within a system. Traditional frequency planning is more difficult and less spectrum efficient the smaller the cells become. For indoor cells the practical planning limit is definitely passed. Continuous or instant dynamic sharing makes it possible to avoid to plan the channel assignments within a system and between systems. This paper presents analysis and simulations on dynamic spectrum sharing. >
Citations
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01 Sep 1995
TL;DR: A survey on the research and development in PCS is presented, emphasizing several important aspects such as the PCS concept, service requirements, system architecture, operation, and management.
Abstract: Personal communication systems (PCS) represent a rapidly growing and increasingly important segment of the telecommunication industry. The goal of PCS is to provide truly personal, cost-efficient communication services to users through portable handsets. In this paper, we present a survey on the research and development in PCS, emphasizing several important aspects such as the PCS concept, service requirements, system architecture, operation, and management. Some ongoing field trials are described as well. We focus on the wireless and the mobility-related features of PCS, discuss their impact on the system design and performance, and provide an overview of different technology choices. >
151 citations
Patent•
01 Oct 2003TL;DR: In this article, a method and a device for controlling frequency selection within a wireless communication system in response to radar-like interference signals is proposed. But the method is not suitable for wireless networks.
Abstract: The invention relates to a method and a device for controlling frequency selection within a wireless communication system in response to radar-like interference signals. The method comprises continuously or quasi-continuously monitoring and assessing a plurality of frequencies with respect to a radar-like interference signal and allocating a quality parameter to each assessed frequency, the quality parameter indicating the probability that the frequency is occupied. The method further comprises selecting one or more frequencies in dependence on the allocated quality parameters and subsequent frequency monitoring.
44 citations
TL;DR: Methods of substantially reducing call dropping in networks which use distributed dynamic channel assignment (DDCA) schemes are discussed and it is suggested that the residual level of call dropping is principally a result of multiple additional call arrivals close to an active link.
Abstract: Methods of substantially reducing call dropping in networks which use distributed dynamic channel assignment (DDCA) schemes are discussed. Interference and received power thresholds coupled with power control are used to maintain performance, without the need for intra-cell handoffs. It is shown that the schemes reduce call dropping and increase capacity compared to those using fixed transmitter power. The schemes are developed with the aid of mathematical analysis and a pictorial model. Results are presented which show that call dropping may be virtually eliminated in shadowing environments with the median transmitter power being reduced by 15 dB. The various call dropping mechanisms are discussed, and it is suggested that the residual level of call dropping is principally a result of multiple additional call arrivals close to an active link. Methods to make further reductions in the call dropping probability are also proposed.
39 citations
Cites background from "On channel definitions and rules fo..."
...D ISTRIBUTED dynamic channel assignment (DDCA) is being increasingly used to improve capacity in both the cellular and cordless telephone markets because of its ability to reuse channels more flexibly, by taking into account local propagation conditions and traffic loads [1]–[6]....
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...Practically all DDCA schemes are susceptible to call dropping (also known as forced terminations) [6], [15], or at least degraded SINRs caused by calls setting up within a vulnerable region....
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Patent•
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TL;DR: In this article, the authors proposed a radio server system in which a mobile radio is connected to a base station by carrying out data communications between base station radios in each of the zones and a plurality of mobile radios such that the base station radio continuously sends data and the mobile radio sends a burst signal to the radio.
Abstract: The present invention relates to a radio server system. The communications service area of this radio server system is made of a plurality of zones and the radio server system connects to the Internet via a radio server in which a mobile radio is connected to a base station radio by carrying out data communications between base station radios in each of the zones and a plurality of mobile radios such that the base station radio continuously sends data and the mobile radio sends a burst signal to the base station radio, wherein the base station radio communicates using a single frequency that is different from the frequency used by neighboring base station radios, and each mobile radio detects the frequency used by the base station radio in the base station radio's zone and communicates with the base station radio using the detected frequency.
26 citations
Patent•
28 Mar 2002
TL;DR: In this paper, a method and a device for controlling frequency selection within a wireless communication system in response to radar-like interference signals is proposed. But the method is not suitable for wireless networks.
Abstract: The invention relates to a method and a device for controlling frequency selection within a wireless communication system in response to radar-like interference signals. The method comprises continuously or quasi-continuously monitoring and assessing a plurality of frequencies with respect to a radar-like interference signal and allocating a quality parameter to each assessed frequency, the quality parameter indicating the probability that the frequency is occupied. The method further comprises selecting one or more frequencies in dependence on the allocated quality parameters and subsequent frequency monitoring.
24 citations
References
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19 Oct 1992
TL;DR: Novel MC/TDMA/TDD radio access principles are described that make it possible to define minimum requirements for a whole class of services and systems, all sharing a common frequency resource in an uncoordinated multioperator environment without preallocation to different services, systems or operators.
Abstract: The paper describes novel MC/TDMA/TDD radio access principles that make it possible to define minimum requirements for a whole class of services and systems, all sharing a common frequency resource in an uncoordinated multioperator environment without preallocation to different services, systems or operators. These services and systems can coexist also with different modulation types, channel bandwidths, power, speech codecs, etc. As a consequence the total market and market shares between operators and between old and new systems or services may vary without need for reallocation of the frequency assignments. It would also allow for future extension or decrease of allocated spectrum as well as introduction of new systems of the same class, without dramatic influence of already installed equipment. >
19 citations