Showing papers on "Cellular network published in 1981"
Patent•
17 Mar 1981
TL;DR: In this paper, the authors proposed a method for effective frequency spectrum utilisation in mobile radio systems which are divided into a multiplicity of geometrically shaped cells, and each cell is served by at least one fixed station which has a directional antenna with a beam width which corresponds to the total area of the allocated cell.
Abstract: The invention relates to a method for effective frequency spectrum utilisation in mobile radio systems which are divided into a multiplicity of geometrically shaped cells. Mobile stations in each cell are served by at least one fixed station which has a directional antenna with a beam width which corresponds to the total area of the allocated cell. Each fixed station communicates with mobile stations in the allocated cell using separate primary channels in a first part of the frequency spectrum of the system if a mobile station is not exposed to any interference above a pre-defined interference level. A mobile station is switched over to a separate secondary channel within a selected segment of a second part of the frequency spectrum of the system if the interference in the mobile station exceeds the pre-defined interference level. Each selected segment which is used in neighbouring parts of adjacent cells lies within a different frequency sub-band of the second part of the frequency spectrum.
4 citations
Patent•
[...]
TL;DR: In this article, the authors propose a flexible adaptation of the channel intervals for avoiding interference in a national mobile radio system, which is designed in the manner of a cellular system and exhibits in the region of the national borders overlapping zones with autonomous mobile networks of the neighbouring countries which operate in the same frequency band but with different channel spacing.
Abstract: The invention relates to a national mobile radio system which is designed in the manner of a cellular system and exhibits in the region of the national borders overlapping zones with autonomous mobile networks of the neighbouring countries which operate in the same frequency band but with different channel spacing. To achieve a flexible adaptation of the channel intervals in this case for avoiding interference, it is proposed to represent the frequency channels, which can be allocated overall to the mobile subscribers (TLN) by the mobile concentrators of the mobile bands (1, 2 ...7), at least in two groups, namely a first group with a first channel pattern (R10) and a second group with a second channel pattern (R12,5). In this arrangement, the allocation of frequency channels of one group by the mobile concentrators to the subscriber stations has priority. In the border area to another autonomous mobile network, frequency channels of the other group are only allocated if otherwise inter-channel interference can be expected in the overlapping zone of these two mobile networks.
3 citations
TL;DR: This paper proposes a model of word memory based on an interconnected network of simple neuron‐like computational cells that may be extended to a comprehensive information processing system based on a hierarchy of such networks.
Abstract: This paper proposes a model of word memory based on an interconnected network of simple neuron‐like computational cells. Major features of the model are the ease of implementation using currently available hardware, and the fact that the principles underlying its operation may be extended to a comprehensive information processing system based on a hierarchy of such networks. The concepts of distributed data storage, the establishing of logical relations between stored items, and the construction of an integrated data structure are characterised in terms of the patterns of activity of the network.
2 citations