Telecommunications – Transmitter and receiver at separate stations
Patent
1995-10-02
1998-01-13
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
455 342, 455 561, 455 62, H04Q 700, H04Q 900
Patent
active
057089680
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a channel segregation method for mobile communications that is applied to a channel allocation control system using an autonomous distributed control scheme based on the priority of each channel and updates the priority in accordance with a CIR value measured or power received for each channel to thereby segregate usable channels among cells.
PRIOR ART
To enhance the frequency utilization efficiency in mobile communications, there have been employed a narrow-band modulation-demodulation technique, a multiple-channel access technique and a spatial-reuse-of-the-same-frequency technique. Among others, the spatial reuse of frequency is a technique indispensable to the construction of a large-scale system that has a wide coverage area (Flenkiel, R. H., "A high-capacity mobile radiotelephone system model using coordinated small-zone approach," IEEE Trans. on Vehic. Tech., vol. VT-19, pp. 173-177, May 1970). A lot of study has been carried out to provide increased efficiency in spatial frequency reuse; there is known, for example, a method that partitions cells in the form of a ring to improve the efficiency of frequency reuse at the center of the ring (Halpern, S. W., "Reuse partitioning in cellular systems," Digest of 33rd IEEE Vehic. Tech. Conf., pp. 322-327, May 1983).
According to these conventional methods, available channels are preliminarily allocated to each cell. This involves complicated work of measuring the level of interference with each cell over the entire service area and allocate an optimum channel to the base station of each cell according to the measured results. In future mobile communications, it is particularly important to reduce the area of each cell so as to increase the number of subscribers, and it is expected that the resulting increase in the number of cells and complexity of radio wave propagation paths will make it very much difficult to allocate the channel to each cell adequately.
In view of the above, a detailed analysis is being made of a dynamic channel assign technique that allows respective cells to share all or some of channels and allocate or use them according to the circumstances (Beck, R., H. Panzer, "Strategies for handover and dynamic allocation in micro-cellular mobile radio systems," Digest of 39th IEEE Vehic. Tech. Conf., pp. 178-185, May 1989). This technique, however, has a disadvantage that if such channel control is effected, as in the past, by a switching center that unifiedly controls all base stations within the service network, a large amounts of information processing and a large-scale control communication network will be needed.
As a solution to this problem, there is now being studied a channel segregation scheme that each base station autonomously performs the channel allocation (Furuya, Y. and Y. Akaiwa, "Channel segregation, a distributed adaptive channel allocation scheme for mobile communication systems," IEICE Trans., vol. E74, pp. 1531-1537, June 1991). This scheme will be described below in brief.
Now, assume that K channels CH.sup.1 to CH.sup.k are allocated to the entire mobile communication system of the service area, that the number of aLL cells C.sub.1 to C.sub.M in the service area is M and that the base station B.sub.m (where m is an integer in the range of 1 to M) of each cell in the service area has a capability of using any of the channels CH.sup.1 to CH.sup.k. Furthermore, let it be assumed that the m-th base station B.sub.m has priority P.sub.m.sup.k (i) on the k-th channel CH.sup.k, where k is an integer in the range of 1 to K and i represents discrete times 1, 2, 3, . . . . Moreover, suppose that the receiver of each base station B.sub.m is capable of measuring received power in each channel. In a mobile communication system the transmitting power is controlled so as to be a constant received power as a desired wave at each base station, and the power that is received in each cell in each channel when no desired wave is being transmitted represents the power of an interference wa
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Arthur Gertrude
Eisenzopf Reinhard J.
Nippon Mobile Communications
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