Method and means for allocating time slots in a TDD system
First Claim
1. Method of allocating time slots in a time division duplex communication system, in which information is transmitted and received in predetermined time frames each having a predetermined number of time slots, wherein first and second types of time slots selected from receiving and transmitting type time slots are allocated, the first time slot of each frame is allocated as the first type of time slot, and the second time slot of each frame is allocated as the second type of time slot, said method comprising:
- determining, based on an amount of information to be transferred, whether at least one time slot following the second time slot of a current frame should be allocated as the first type of time slot, and if so, always allocating the last time slot of the current frame as the first type of time slot, whereby the last time slot of the current frame and the first time slot of a succeeding frame are the same type of time slots; and
allocating time slots following the second time slot of the current frame as additional receiving or transmitting time slots dependent on an amount of information to be transmitted and/or received, wherein if additional time slot(s) are allocated for the second type of time slot, always allocating at least the third time slot of the current frame as an additional second type time slot.
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Abstract
Method and apparatus for allocating time slots in a time division duplex communication system. First and second types of time slots selected from receiving and transmitting type time slots are allocated as the first and second time slots, respectively, in a current frame. Based on an amount of information to be transferred, it is determined whether at least one time slot following the second time slot of the frame should be allocated as the first type of time slot, and if so, the last time slot of the frame is always allocated as the first type of time slot, whereby the last time slot of the frame and the first time slot of a succeeding frame are of the same type. If an additional time slot(s) is allocated for the second type of time slot, the third slot is always designated for the second type.
19 Citations
35 Claims
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1. Method of allocating time slots in a time division duplex communication system, in which information is transmitted and received in predetermined time frames each having a predetermined number of time slots, wherein first and second types of time slots selected from receiving and transmitting type time slots are allocated, the first time slot of each frame is allocated as the first type of time slot, and the second time slot of each frame is allocated as the second type of time slot, said method comprising:
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determining, based on an amount of information to be transferred, whether at least one time slot following the second time slot of a current frame should be allocated as the first type of time slot, and if so, always allocating the last time slot of the current frame as the first type of time slot, whereby the last time slot of the current frame and the first time slot of a succeeding frame are the same type of time slots; and
allocating time slots following the second time slot of the current frame as additional receiving or transmitting time slots dependent on an amount of information to be transmitted and/or received, wherein if additional time slot(s) are allocated for the second type of time slot, always allocating at least the third time slot of the current frame as an additional second type time slot. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Apparatus for allocating time slots in a time division duplex communication system, in which information is transmitted and received in predetermined time frames each having a predetermined number of time slots, wherein first and second types of time slots selected from receiving and transmitting type time slots are allocated, the first time slot of each frame is allocated as the first type of time slot, and the second time slot of each frame is allocated as the second type of time slot, said apparatus comprising:
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determining means for determining, based on an amount of information to be transferred, whether at least one time slot following the second time slot of a current frame should be allocated as the first type of time slot, and if so, always allocating the last time slot of the current frame as the first type of time slot, whereby the last time slot of the current frame and the first time slot of a succeeding frame are the same type of time slots; and
allocating means for allocating time slots following the second time slot of the current frame as additional receiving or transmitting time slots dependent on an amount of information to be transmitted and/or received, wherein if additional time slot(s) are allocated for the second type of time slot, always allocating at least the third time slot of the current frame as an additional second type time slot. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. Communication method for transmitting and receiving information in a time division duplex communication system, comprising the steps of:
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allocating a changeable number of receiving time slots and a number of transmitting time slots in a time frame having a predetermined number of time slots, the allocation of time slots being changed when the amount of information to be transferred is changed, and transmitting information by using said time slots dependent on the amount of information to be transferred, wherein said time frame contains at least a receiving time slot and an adjacent transmitting time slot, and a guard period provided in at least one of said receiving and adjacent transmitting time slots. - View Dependent Claims (16, 17, 18)
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19. A communication unit for transmitting and receiving information in a time division duplex communication system, said information being transmitted in predetermined time frames having a predetermined number of time slots, comprising
allocation means for allocating the time slots as receiving time slots and transmitting time slots dependent on an amount of information to be transferred, whereby each time frame comprises a receiving time slot and an adjacent transmitting time slot, determining means for determining the amount of information to be transferred, whereby the allocation of time slots by the allocation means is changed when the amount of information to be transferred is changed, and guard period means for providing a guard period in at least one of said receiving and adjacent transmitting time slots.
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23. Communication method for transmitting and receiving information in a time division duplex communication system, comprising the steps of:
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allocating a predetermined number of time slots by which said time division duplex communication system transfers information, said predetermined number of time slots comprising fixed blocks of a receiving time slot and an adjacent transmitting time slot, allocating at least the time slot adjacent to the receiving time slot of a fixed block as an additional receiving time slot and at least the time slot adjacent the transmitting time slot of said fixed block as an additional transmitting time slot dependent on an amount of information to be transferred, and changing the allocation of said time slots when the amount of information to be transferred is changed. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. A communication unit for transmitting and receiving information in a time division duplex communication system, said information being transmitted in a predetermined number of time slots, said predetermined number of time slots comprising a fixed block of one receiving time slot and one transmitting time slot adjacent to each other, said communication unit comprising:
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allocation means for allocating at least the time slot adjacent the receiving time slot of a fixed block as an additional receiving time slot and at least the time slot adjacent the transmitting time slot of said fixed block as an additional transmitting time slot dependent on an amount of information to be transferred, and determining means for determining the amount of information to be transferred, whereby the allocation of time slots by said allocation means is changed when the amount of information to be transferred is changed. - View Dependent Claims (31, 32, 33)
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34. A communication device for transmitting and/or receiving information in time frames having predetermined time slots in a time division duplex communication system, said communication device comprising:
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means for allocating the predetermined time slots into a number of receiving time slots and a number of transmitting time slots;
means for changing the allocation of said time slots based on an amount of information to be transferred; and
means for providing a guard period between a receiving time slot which is one of said allocated receiving time slots and a succeeding adjacent transmitting time slot which is one of said allocated transmitting time slots.
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35. A communication method for transmitting and/or receiving information in time frames having predetermined time slots in a time division duplex communication system, comprising the steps of:
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allocating the predetermine time slots into a number of receiving time slots and a number of transmitting time slots;
changing the allocation of said time slots based on an amount of information to be transferred; and
providing a guard period between a receiving time slot which is one of said allocated receiving time slots and a succeeding adjacent transmitting time slot which is one of said allocated transmitting time slots.
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Specification