Point to multipoint radio access system
First Claim
1. A method of allocating radio link characteristics in a point to multipoint radio access system, the point to multipoint radio access system comprising a number of base stations including a selected base station connected by a plurality of radio links to a corresponding plurality of subscriber terminals located within respective coverage areas of the selected base station, at least some of the plurality of radio links being within a same frequency band, the method comprising:
- for the selected base station, selecting a base station power density which, for each of a plurality of modulation types, is constant for all bitrates;
for each of the plurality of subscriber terminals located within the coverage area of the selected base station, selecting a terminal power density which, for each of the plurality of modulation types, is constant for all bitrates;
determining a maximum range for each of the plurality of modulation types;
for each of the plurality of subscriber terminals, allocating a modulation type to the corresponding radio link dependent upon range from the selected base station;
determining, for each of the plurality of subscriber terminals, whether at the subscriber terminal there is an acceptable signal quality and, if not, allocating a next lower modulation type to the radio link corresponding to the subscriber terminal which does not have the acceptable signal quality; and
determining at the selected base station whether there is an acceptable signal quality with respect to each of the plurality of subscriber terminals and, if not, allocating a next lower modulation type to the radio link corresponding to the subscriber terminal with respect to which there is not the acceptable signal quality.
1 Assignment
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Accused Products
Abstract
Link characteristics including modulation type are allocated to radio links in a point to multipoint system. The method allows for various modulation types, and takes into consideration the required coverage range, the minimum bandwidth requirement, and the foreseen interference situation.
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Citations
6 Claims
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1. A method of allocating radio link characteristics in a point to multipoint radio access system, the point to multipoint radio access system comprising a number of base stations including a selected base station connected by a plurality of radio links to a corresponding plurality of subscriber terminals located within respective coverage areas of the selected base station, at least some of the plurality of radio links being within a same frequency band, the method comprising:
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for the selected base station, selecting a base station power density which, for each of a plurality of modulation types, is constant for all bitrates; for each of the plurality of subscriber terminals located within the coverage area of the selected base station, selecting a terminal power density which, for each of the plurality of modulation types, is constant for all bitrates; determining a maximum range for each of the plurality of modulation types; for each of the plurality of subscriber terminals, allocating a modulation type to the corresponding radio link dependent upon range from the selected base station; determining, for each of the plurality of subscriber terminals, whether at the subscriber terminal there is an acceptable signal quality and, if not, allocating a next lower modulation type to the radio link corresponding to the subscriber terminal which does not have the acceptable signal quality; and determining at the selected base station whether there is an acceptable signal quality with respect to each of the plurality of subscriber terminals and, if not, allocating a next lower modulation type to the radio link corresponding to the subscriber terminal with respect to which there is not the acceptable signal quality. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification