Systems and methods for channel allocation for forward-link multi-user systems
First Claim
1. A method of allocating a total frequency bandwidth among a plurality of sectors in a cell, for application in three sector cells, the method comprising:
- allocating a respective subset of the total frequency to each sector, each subset comprising at least two sub-bands;
wherein the respective subsets allocated to any two adjacent sectors have at least one sub-band in common and at least one sub-band which is not in common; and
wherein each sub-band comprises one-third of the total frequency bandwidth such that the respective subset allocated to each sector comprises two-thirds of the total frequency bandwidth and each sector shares one third of the total frequency bandwidth with each adjacent sector.
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Accused Products
Abstract
A method of allocating bandwidth is provided which involves for each sector of a plurality of sectors in a cell, using a respective subset of a total bandwidth; wherein for any two adjacent sectors, the respective subsets only partially overlap. A scheduling method is provided which involves for each sector, scheduling users for transmission on the respective subset of the total bandwidth by: for a given transmitter, allocating a respective fraction of capacity associated with the available bandwidth to each of at least two users selected from a plurality of users by performing an optimization for a selected scheduler design, the optimization selecting the at least two users and the optimization determining for each user the respective fraction of capacity; generating and transmitting a signal in which each of the at least two users has the respective fraction of capacity.
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Citations
51 Claims
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1. A method of allocating a total frequency bandwidth among a plurality of sectors in a cell, for application in three sector cells, the method comprising:
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allocating a respective subset of the total frequency to each sector, each subset comprising at least two sub-bands; wherein the respective subsets allocated to any two adjacent sectors have at least one sub-band in common and at least one sub-band which is not in common; and wherein each sub-band comprises one-third of the total frequency bandwidth such that the respective subset allocated to each sector comprises two-thirds of the total frequency bandwidth and each sector shares one third of the total frequency bandwidth with each adjacent sector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of allocating a total frequency bandwidth among a plurality of sectors of a cell, the method comprising:
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allocating a respective subset of the total frequency to each sector, each subset comprising at least two sub-bands; wherein the respective subsets allocated to any two adjacent sectors have at least one sub-band in common and at least one sub-band which is not in common; and for each sector, scheduling users for transmission on the respective subset of the total frequency bandwidth allocated to any given sector, by; performing an optimization for a selected scheduler design, the optimization selecting at least two users from among a plurality of users, and determining for each user a respective fraction of capacity associated with the respective subset of the total frequency bandwidth allocated to the sector; and generating and transmitting a signal in which each of the at least two users has the respective fraction of capacity, wherein the scheduler design is selected from a group comprising; proportional fairness, proportional fairness for FTP traffic, adaptive scheduler, adaptive scheduler for video service. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method of scheduling users for transmission on an available bandwidth allocated to a transmitter, the method comprising:
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performing an optimization for a selected scheduler design, the optimization selecting at least two users from among a plurality of users, and determining for each user a respective fraction of capacity associated with the available bandwidth allocated to the transmitter;
wherein the optimization is performed every transmission interval, and the optimization maximizes sector throughput,wherein the scheduler design is selected from a group comprising; proportional fairness, proportional fairness for FTP traffic, adaptive scheduler, adaptive scheduler for video service. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method of scheduling users for transmission on an available bandwidth allocated to a transmitter, the method comprising:
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performing an optimization for a selected scheduler design, the optimization selecting at least two users from among a plurality of users, and determining for each user a respective fraction of capacity associated with the available bandwidth allocated to the transmitter;
wherein the optimization is performed every transmission interval, and the optimization maximizes sector throughput,the method further comprising generating a CDMA signal from content of at least two users by modulating content of each user to a respective subset of a set of orthogonal codes. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41)
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42. An apparatus comprising:
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a respective transmitter and antenna for each sector of a plurality of sectors in a cell, each transmitter using a respective subset of a total frequency bandwidth, wherein each subset comprises at least two sub-bands of the total frequency bandwidth, and wherein the respective subsets allocated to any two adjacent sectors have at least one sub-band in common and at least one sub-band which is not in common; and an optimization process adapted to, for each sector, schedule users for transmission on the respective subset of the total bandwidth by; for a given transmitter, allocating a respective fraction of capacity associated with the available bandwidth to each of at least two users selected from a plurality of users by performing an optimization for a selected scheduler design, the optimization selecting the at least two users and the optimization determining for each user the respective fraction of capacity, wherein the optimization process uses an unconstrained optimization obtained by using a Lagrangian of a constrained optimization. - View Dependent Claims (43, 44, 45, 46, 47)
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48. An apparatus for scheduling users for transmission on an available bandwidth allocated to a transmitter, the apparatus comprising:
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an optimizer adapted to perform an optimization for a selected scheduler design, the optimization selecting at least two users from a plurality of users, and determining for each user a respective fraction of capacity associated with the available bandwidth allocated to the transmitter, wherein the optimization maximizes sector throughput; and signal generation circuitry for generating a signal in which each of the at least two users have the respective fraction of capacity, wherein said signal is an OFDM signal, said signal generation circuitry comprises a symbol selector for selecting symbols for each user and mapping them to a time domain representation, and an IFFT function for mapping the time domain representation into a frequency domain representation. - View Dependent Claims (49)
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50. An apparatus for scheduling users for transmission on an available bandwidth allocated to a transmitter, the apparatus comprising:
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an optimizer adapted to perform an optimization for a selected scheduler design, the optimization selecting at least two users from a plurality of users, and determining for each user a respective fraction of capacity associated with the available bandwidth allocated to the transmitter, wherein the optimization maximizes sector throughput; and signal generation circuitry for generating a signal in which each of the at least two users have the respective fraction of capacity, wherein said signal is a CDMA signal, the apparatus comprising; a plurality of Walsh code spreaders adapted to perform Walsh code spreading with a respective Walsh code of a set of Walsh codes, wherein the CDMA signal is generated from content of the at least two users by modulating content of each user with a respective subset of the set of Walsh codes. - View Dependent Claims (51)
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Specification