Telecommunications – Transmitter and receiver at separate stations
Patent
1991-10-25
1995-08-15
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
455 541, 455 62, 455 63, 455 673, H04B 1500
Patent
active
054428041
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method for resource allocation in a radio system. Radio systems can be one-way with communication in only one direction, for example paging system, or two-way, for example mobile radio system. In the application, a mobile radio system is preferably dealt with, but it is understood that the invention is equally well applicable to one-way systems. It is important in a mobile radio system that accessible frequency resources are used in such a manner that the system capacity is optimized with the condition that the customers experience an acceptable quality. In a microcell system in a densely populated area it is desirable that the channel allocation can be tailored to the current traffic distribution. Such planning is a very demanding task and there are great gains to be made if the system operator has full control over the inherent interferences in the system. Improved quality and traffic handling in a given frequency band is also equivalent to an increased frequency economy.
The following preconditions are given: a distribution of the traffic requirement over, for example, Stockholm, system parameters which define which C/I (carrier to interference) interference characteristic is required for good reception and how much interference the receiver tolerates in adjoining channels, and a frequency band of the system with a limited number of channels. It is the object to distribute the channels to the different base stations in the given frequency range so that the quality of the connection experienced by the customers meets given minimum requirements.
STATE OF THE ART
The literature on the subject supplies information on how the problem is solved in principle. The method is as follows: a systematic description is given of all restrictions which apply to channel allocation in the form of a so-called exclusion matrix. An exclusion matrix produces a description in symbolic form of how different base stations, alternatively mobiles in different coverage areas, can be shared with respect to co-channel and adjacent-channel conditions. Allocating algorithms are then used for finding exactly which channels the different base stations must have for the minimum requirement for connection quality to be met.
The exclusion matrix in turn enables an allocating program to be driven and channel allocations are obtained for a situation with very well known and desired interference characteristics which ensure a good connection quality.
Much is written in the literature about algorithms for frequency allocation (channel allocation) for telecommunication systems of different types. For example, William K. Hale mentions the following procedure which, simplified, consists of the following steps: coverage area. transmitter and the coverage area of the other transmitters. predetermined scheme. In the same paper, this scheme constitutes the allocating algorithm. allocation can be read out.
This procedure is deterministic which means that each time the algorithm is run through exactly the same allocation is obtained for one and the same constellation of transmitters. In an article by Andreas Gamst "A resource allocation technique for FDMA systems" published in Alta Frequenza, Vol. LVII-N.2 February-March 1988, a technique for resource allocation in a mobile radio system is described. The channel requirement and exclusion matrix is obtained by means of a data program (GRAND) which utilizes topographic data, predictions for wave propagation and a statistical model for station hand-over. For a cellular system, the lower limit for the requirement of the number of frequency channels is calculated. A heuristic allocating algorithm which provides a frequency allocation plan is iterated and the number of frequencies calculated for each frequency plan. The allocating algorithm includes a random control and the number of frequencies therefore does not become the same with each iteration. If the number of frequencies in a frequency plan is less than or equal to the calculated lower lim
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Gunmar Krister
Tegth Ulf
Eisenzopf Reinhard J.
Faile Andrew
Televerket
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