Method and apparatus for handover in TDMA mobile communications system
First Claim
1. A method of seamless handover in a telecommunications system, the method including:
- when a mobile telephone has established communication with a first base station on a particular timeslot in a frame, if another timeslot is available in the frame in a second base station, (a) establishing communication within the frame with the second base station on the another timeslot in the frame, the another timeslot not next to the particular timeslot if the frequencies used on the particular timeslot and the another timeslot are different and (b) if the frequencies used on the particular timeslot and the another timeslot are the same, establishing communication with the second base station on the another timeslot in the frame, the another timeslot being next to the particular timeslot or not next to the particular timeslot and continuing communication simultaneously with both the first and second base station.
4 Assignments
0 Petitions
Accused Products
Abstract
A mobile communications system including a plurality of base stations. The system includes a plurality of mobile telephones. Each mobile telephone communicates with at least a base station from the plurality of base station using a timeslot and a frame. The frame has a plurality of timeslots for the base station to use to communicate with the various of the plurality of mobile telephones in a cell covered by the base station. Each mobile telephone has a single radio capable of communication on various frequencies. The radio is not capable of communicating on different frequencies on adjacent timeslots in a frame. A mobile telephone may establish communication with a first base station on a particular timeslot in a frame. If another timeslot is available in the frame in a second base station, communication may be established with the second base station on another timeslot in the frame. The another timeslot is not next to the particular timeslot if the frequency used on the particular timeslot and the another timeslot are different. If the frequencies used on the particular timeslot and the another timeslot are the same, communication may be established with the second base station on the another timeslot in the frame where the another timeslot is next to the particular timeslot or not next to the particular timeslot.
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Citations
24 Claims
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1. A method of seamless handover in a telecommunications system, the method including:
when a mobile telephone has established communication with a first base station on a particular timeslot in a frame, if another timeslot is available in the frame in a second base station, (a) establishing communication within the frame with the second base station on the another timeslot in the frame, the another timeslot not next to the particular timeslot if the frequencies used on the particular timeslot and the another timeslot are different and (b) if the frequencies used on the particular timeslot and the another timeslot are the same, establishing communication with the second base station on the another timeslot in the frame, the another timeslot being next to the particular timeslot or not next to the particular timeslot and continuing communication simultaneously with both the first and second base station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of seamless handover in a telecommunications system, the method including:
when a mobile telephone has established communication with a first base station on a particular timeslot in a frame wherein the frame comprises two half frames, and each half frame comprises no more than six timeslots, if another timeslot is available in the frame in a second base station, (a) establishing communication simultaneously within the frame with the second base station on the another timeslot in the frame, the another timeslot not next to the particular timeslot if the frequencies used on the particular timeslot and the another times lot are different and (b) if the frequencies used on the particular timeslot and the another timeslot are the same, establishing communication with the second base station on the another timeslot in the frame, the another timeslot being next to the particular timeslot or not next to the particular timeslot. - View Dependent Claims (14, 15, 16, 17)
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18. A method of seamless handover in a telecommunications system, the method including:
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when a mobile telephone has established communication with a first base station on a particular timeslot in a frame, determining available timeslots in the frame in a second base station;
determining available frequencies from the second base station;
establishing communication within the frame with the second base station on any selected one of the available timeslots in the frame if the frequencies to be used on the particular timeslot and the selected timeslot are the same and, if the frequencies to be used on the particular timeslot and the selected timeslot are different, choosing a selected one of the available timeslots not next to the particular timeslot for establishing communication with the second base station; and
,continuing simultaneous communication within the frame with the first and second base station. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification