초록 ▼

The invention relates to a communication method for a digital cellular mobile telephone system and a digital cellular mobile telephone system comprising several base stations and mobiles utilizing time division multiple access. In the system communication is carried out on a predetermined frequency

The invention relates to a communication method for a digital cellular mobile telephone system and a digital cellular mobile telephone system comprising several base stations and mobiles utilizing time division multiple access. In the system communication is carried out on a predetermined frequency band in a predetermined number of time slots having a predetermined length. In the communication between the mobiles and the base station within the TDMA time slot with the predetermined length, the transmissions to communicate information comprising a few bits or several bits from the mobiles communicating with the same base station at least within the same time slot are mutually substantially orthogonal. Preferably, in order to communicate information, preferably information of the on-off type, such as acknowledgments and channel allocation requests, the mobiles communicating with the same base station use substantially orthogonal transmissions at least to the same base station in the same time slot. Preferably each mobile transmits within the TDMA burst of said TDMA time slot of the predetermined length as a part of the burst a predetermined bit sequence corresponding to the transmitted information bit combination, whereby the predetermined frequency band is unchanged. The bit sequences transmitted by different mobiles to the same base station are mutually substantially orthogonal. By using such substantially orthogonal transmissions it is possible to avoid collisions between the communications of information comprising a few or several bits, typically 1 to 10 bits, such as acknowledgments and channel allocation requests, which typically occur in a time division multiple access system.

대표청구항 ▼

A radio communications system, comprising: at least one central transceiver comprising means for transmitting information over a radio channel and for receiving information over the radio channel; and a plurality of user transceivers each comprising means for transmitting information over the radio

A radio communications system, comprising: at least one central transceiver comprising means for transmitting information over a radio channel and for receiving information over the radio channel; and a plurality of user transceivers each comprising means for transmitting information over the radio channel and for receiving information over the radio channel, the information being transmitted by each of said plurality of user transceivers in a bit serial digital format; wherein said transmitting means of at least said plurality of user transceivers utilize the radio channel for transmission as a time division, multiple access radio channel characterized by a plurality of recurring frames, each of said frames comprising a plurality of equal length slots having a duration that is selected for enabling up to n bits of data to be transmitted to the central transceiver from a user transceiver; wherein each user transceiver further comprises means for receiving a pre-assignment of an individual one of a plurality of first slots for conveying communications traffic information; wherein said transmitting means of said plurality of user transceivers transmit a message to said central transceiver during at least one second slot, the transmitted message comprising up to m bits of data, where m