Digital radio transmission system
First Claim
1. In a digital radio transmission system comprising a plurality of base stations and mobile stations arranged in a cellular network and wherein messages to be communicated between each base station and the respective mobile stations assigned thereto are transmitted over respective communication channels, the improvement characterized in that each base station comprises multiplexing means for multiplexing messages to be transmitted from such base station to the mobile stations assigned thereto by a combination of three different modes of multiplexing, such modes including time division multiplexing of respective time slots in successive time frames, code-division multiplexing of such time frames in accordance with respective codewords, and frequency-division multiplexing of such code division multiplexed time frames at respective carrier frequencies, the respective base stations being identified by employing respective combinations of said codewords and said carrier frequencies;
- and each mobile station comprises multiplexing means for multiplexing messages to be transmitted from such mobile station to the base station assigned thereto by at least one of said modes of multiplexing.
2 Assignments
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Accused Products
Abstract
A cellular digital radio transmission system which increases the number of available communication channels between base stations and mobile stations in such system. Message transmission from a base station to its assigned mobile stations is effected by a combination of time-division, code-division and frequency-division multiplexing. Message transmission from the mobile stations assigned to a particular base station is effected by at least one of such multiplexing modes.
220 Citations
3 Claims
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1. In a digital radio transmission system comprising a plurality of base stations and mobile stations arranged in a cellular network and wherein messages to be communicated between each base station and the respective mobile stations assigned thereto are transmitted over respective communication channels, the improvement characterized in that each base station comprises multiplexing means for multiplexing messages to be transmitted from such base station to the mobile stations assigned thereto by a combination of three different modes of multiplexing, such modes including time division multiplexing of respective time slots in successive time frames, code-division multiplexing of such time frames in accordance with respective codewords, and frequency-division multiplexing of such code division multiplexed time frames at respective carrier frequencies, the respective base stations being identified by employing respective combinations of said codewords and said carrier frequencies;
- and each mobile station comprises multiplexing means for multiplexing messages to be transmitted from such mobile station to the base station assigned thereto by at least one of said modes of multiplexing.
- View Dependent Claims (2, 3)
Specification