Frame structure using consecutive slot assignments for mobile communications
First Claim
1. A frame structure for use in a multiple frequency wireless communication system having at least one central station and a plurality of peripheral stations in which said stations communicate data using a slotted protocol having a predetermined number of slots in a frame, comprising:
- a transit slot in which said at least one central station transmits to one peripheral station; and
a receive slot in which said one peripheral station transmits back to said central station, said receive slot being adjacent in time to said transmit slot;
whereby the number of slots available for monitoring various frequencies exceeds two slots.
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Accused Products
Abstract
An improved frame structure for use in mobile communications systems utilizing slotted protocols is provided. According to the present invention, consecutive slots in a frame are assigned to each mobile unit so that the mobile unit transmits to a base station during the first slot and receives a transmission from the base station during the second slot. This frame structure, permits the mobile unit to monitor various frequencies for a longer and more continuous period of time. It is important for the mobile unit to have enough time to monitor frequencies while it is not transmitting or receiving so that base station handoff and interference avoidance handoff techniques can be performed by the mobile communications system. Furthermore, according to the frame structure provided by the present invention, the mobile units can be designed with a standard frequency synthesizer. The improved frame structure also allows channel distortion to be minimized by providing adaptive equalization with transmit precompensation and/or antenna diversity in the base stations.
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Citations
20 Claims
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1. A frame structure for use in a multiple frequency wireless communication system having at least one central station and a plurality of peripheral stations in which said stations communicate data using a slotted protocol having a predetermined number of slots in a frame, comprising:
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a transit slot in which said at least one central station transmits to one peripheral station; and a receive slot in which said one peripheral station transmits back to said central station, said receive slot being adjacent in time to said transmit slot; whereby the number of slots available for monitoring various frequencies exceeds two slots. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A multiple frequency wireless communications system using a frame structure providing a predetermined number of time slots in each frame, comprising:
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a first peripheral station for transmitting a signal comprising data during a first time slot in a first frame; a central station for receiving said signal during said first time slot; and said central station being configured to transmit a return signal comprising data to said first peripheral station in a second time slot in said first frame adjacent to said first time slot; whereby said first peripheral station monitors various frequencies during at least two consecutive time slots between said second time slot in said first frame and said first time slot in the next frame. - View Dependent Claims (9, 10, 11, 12, 13)
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14. In a mobile communications system comprising at least one base station and a plurality of mobile units, said mobile units communicating with one base station using a slotted protocol, each mobile unit transmitting at an assigned operating frequency, a method for generating additional time slots for use by at least one mobile unit to monitor frequencies other than the assigned frequency of that mobile unit, comprising the steps of:
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defining a predetermined period of time as a frame; subdividing said frame into a plurality of time slots; transmitting a first signal from said one mobile unit to said one base station during one of said time slots; and receiving a second signal at said one mobile unit during a next time slot directly following said one time slot, said second signal being transmitted by said one base station. - View Dependent Claims (15, 16, 17, 18)
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19. A method of minimizing channel distortion in a mobile communications system having at least one stationary base station and a plurality of mobile units, said mobile communications system using time division duplexing so that each mobile unit is assigned a time slot in which said mobile unit is operable to transmit to said base station, said time slot defining a transmit slot and each said mobile unit is assigned a second time slot in which said mobile unit is operable to receive a transmission from said base station said second time slot defining a receive slot, the method comprising the steps of:
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assigning each mobile unit consecutive transmit and receive slots; transmitting a first signal from one mobile unit during a respective transmit slot of said one mobile unit; receiving said first signal at said base station during said respective transmit slot; adaptively equalizing said signal so received to define parameters of a receive filter; generating a transmit filter to compensate for channel distortion by using substantially similar parameters of said receive filter to define said transmit filter; and filtering a second signal to be transmitted from said base station back to said one mobile unit using said transmit filter so generated. - View Dependent Claims (20)
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Specification