Method and a Device for Improved Scheduling
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Abstract
The invention discloses a method (400) for a cellular system (100), with a first node (110) which schedules traffic to and from users (120) in a cell (130). The first node uses a first channel (230) in a first kind of data frame (200) to transmit scheduling information to users in a cell. The first kind of data frame (200) comprises a plurality of symbols (210), a number of which are used for the first channel, and according to the invention the first node assigns (405) scheduling information to the symbols (210) in the first channel. The number of symbols used for the first channel is variable (410) and calculated (415) before the scheduling information is assigned to the symbols in the first channel, and is dependent (420) on the number of symbols were needed for scheduling information during a period of time before said calculation is made.
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Citations
32 Claims
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1-18. -18. (canceled)
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19. A method for use in a wireless cellular communications system, said system comprising a number of cells in each of which there can be a number of users, in which system there is a first node which schedules traffic to and from users in a cell, and in which system the first node uses a first channel having a first kind of data frame to transmit scheduling information to users in a cell, said first kind of data frame comprising a plurality of symbols, with multiple sub-carriers, N carriers, in one and the same frame, so that a symbol is spread over N frequencies, said first kind of data frame also being divided in time with M time slots, with a number of said symbols being used for the first channel, and said method comprising:
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assigning, at said first node, scheduling information to the symbols in the first channel, wherein the number of symbols which is used for the first channel is variable and is calculated before the scheduling information is assigned to the symbols in the first channel and is dependent on the number of symbols which were needed for scheduling information during a certain period of time before said calculation is made; dividing each symbol into elements, each of which comprises a plurality of said sub-carriers, with a nominal power level being defined for each of said elements; decreasing the power level used for one or more elements in a frame, if a certain transmission quality can be maintained; and increasing the number of elements used in a sub frame based on the difference between the nominal power level for the elements in the sub frame and the actual power level used for the elements in the sub frame. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A transceiver for use as a first node in a wireless cellular communications system which comprises a number of cells in each of which there can be a number of users, said transceiver comprising:
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a transmitter that is configured for transmitting with multiple sub-carriers, N carriers, in one and the same frame, so that a symbol is spread over N frequencies, said frame also being divided in time with M time slots; and a controller that is operatively associated with the transmitter and is configured to schedule traffic to and from users in a cell, and is configured to use a first channel having a first kind of data frame to transmit scheduling information to users in the cell, wherein said first kind of data frame comprises a plurality of symbols; and wherein the controller is further configured to; use a number of said symbols for the first channel and to assign scheduling information to the symbols in the first channel; and vary the number of symbols which is used for the first channel, based on calculating the number of symbols before the scheduling information is assigned to the symbols in the first channel, said calculation being dependent on the number of symbols which were needed for scheduling information during a certain period of time before said calculation; and wherein the controller is configured to divide each symbol into elements, each of which comprises a plurality of said sub-carriers, with a nominal power level being defined for each of said elements, and to decrease the power level used for one or more elements in a frame, if a certain transmission quality can be maintained, and to increase the number of elements in a sub frame based on the difference between the nominal power level for the elements in the sub frame and the actual power level used for the elements in the sub frame. - View Dependent Claims (27, 28, 31, 32)
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28-1. The first node of claim 27, wherein the elements into which the symbols are divided into are the Control Channel Elements (CCEs) of the LTE system.
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30. The first node of 27, wherein the scheduling information is the scheduling assignments and scheduling grants of the LTE system.
Specification