System and method for maintaining spectral capacity in time division duplex (TDD) systems
First Claim
1. A communications system comprising:
- a plurality of time division duplex (TDD) platform pairs, each TDD platform pair comprising a first communications platform and a second communications platform being coupled to said first communications platform, said first communications platform transmitting first data during a first frame, receiving second data during a second frame, said second communications platform receiving third data during said first frame, transmitting fourth data during said second frame; and
a plurality of time division duplex subscriber units (TDDSUs), each TDDSU establishing a first link with said first communications platform, establishing a second link with said second communications platform, receiving said first data from said first communications platform using said first link during said first frame, transmitting said third data to said second communications platform using said second link during said first frame, transmitting said second data to said first communications platform using said first link during said second frame, receiving said fourth data from said second communications platform using said second link during said second frame.
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Accused Products
Abstract
A communications system (100) has at least one TDD platform pair (130, 200) operating synchronously using a Time Division Duplex (TDD) frame structure. A TDD platform pair (130, 200) has first communications platform (124) and second communications platform (126) that are coupled (135) together. First communications platform (124) transmits first data during a first frame and receives second data during a second frame. Second communications platform (126) receives third data during the first frame and transmits fourth data during the second frame. At least one TDDSU (110) receives the first data, transmits the second data, transmits the third data, and receive the fourth data. First communications platform (124) has a first coverage area, and the second communications platform (126) has a second coverage area. A dual coverage area exists where the first coverage region overlaps the second coverage region. At least one TDDSU (110) is located within the dual coverage region.
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Citations
26 Claims
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1. A communications system comprising:
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a plurality of time division duplex (TDD) platform pairs, each TDD platform pair comprising a first communications platform and a second communications platform being coupled to said first communications platform, said first communications platform transmitting first data during a first frame, receiving second data during a second frame, said second communications platform receiving third data during said first frame, transmitting fourth data during said second frame; and
a plurality of time division duplex subscriber units (TDDSUs), each TDDSU establishing a first link with said first communications platform, establishing a second link with said second communications platform, receiving said first data from said first communications platform using said first link during said first frame, transmitting said third data to said second communications platform using said second link during said first frame, transmitting said second data to said first communications platform using said first link during said second frame, receiving said fourth data from said second communications platform using said second link during said second frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A plurality of time division duplex (TDD) platform pairs for use in a communications system which uses a TDD frame structure, each TDD platform pair comprising:
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a first communications platform;
a second communications platform being coupled to said first communications platform, said first communications platform transmitting first data during a first frame, receiving second data during a second frame, said second communications platform receiving third data during said first frame, transmitting fourth data during said second frame;
said first communications platform further comprises;
a first crosslink antenna, a first crosslink transceiver coupled to said first crosslink antenna, a first subscriber link antenna, a first subscriber link transceiver coupled to said first subscriber link antenna, and a first controller coupled to said first crosslink transceiver and coupled to said first subscriber link transceiver; and
said second communications platform further comprises;
a second crosslink antenna, a second crosslink transceiver coupled to said second crosslink antenna, a second subscriber link antenna, a second subscriber link transceiver coupled to said second subscriber link antenna, and a second controller coupled to said second crosslink transceiver and coupled to said second subscriber link transceiver, said first communications platform being coupled to said second communications platform using a crosslink established between said first crosslink antenna and said second crosslink antenna; and
said first subscriber link transceiver transmits said first data during a second sub-frame in said first frame and said second subscriber link transceiver receives said second data during a first sub-frame in said second frame. - View Dependent Claims (20, 21)
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22. A method of operating a time division duplex (TDD) platform pair, the method comprising the steps of:
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a) determining if a current frame has a count that is an odd number or an even number;
b) when said count is said odd number, operating a first communications platform in a transmit mode during said current frame;
c) when said count is said odd number, operating a second communications platform in a receive mode during said current frame;
d) when said count is said even number, operating said first communications platform in said receive mode during said current frame; and
e) when said count is said odd number, operating said second communications platform in said transmit mode during said current frame. - View Dependent Claims (23, 24)
b1) establishing a first subscriber link between said first communications platform and a first TDDSU using a first frequency;
b2) transmitting first data during a first frame; and
b3) receiving second data during a second frame.
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24. The method of operating a TDD platform pair as claimed in claim 22, wherein step c) further comprises the steps of:
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c1) establishing a second subscriber link between said second communications platform and a first TDDSU using a first frequency;
c2) transmitting third data during a first frame; and
c3) receiving fourth data during a second frame.
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25. A method of operating a time division duplex subscriber unit (TDDSU), the method comprising the steps of:
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a) establishing a first link with a first communications platform in a TDD platform pair;
b) establishing a second link with a second communications platform in said TDD platform pair;
c) receiving first data from said first communications platform using said first link during a first frame, said first frame being in a TDD frame structure established by said TDD platform pair;
d) transmitting third data to said second communications platform using said second link during said first frame;
e) transmitting second data to said first communications platform using said first link during a second frame, said second frame being in said TDD frame structure established by said TDD platform pair;
f) receiving fourth data from said second communications platform using said second link during said second frame; and
g) processing said first data, said second data, said third data, and said fourth data. - View Dependent Claims (26)
a1) operating said TDDSU in a transmit mode during a first number of sub-frames; and
a2) operating said TDDSU in a receive mode during a second number of sub-frames.
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Specification