OFDMA with adaptive subcarrier-cluster configuration and selective loading
DC CAFC- US 7,454,212 B2
- Filed: 08/08/2005
- Issued: 11/18/2008
- Est. Priority Date: 12/15/2000
- Status: Expired due to Fees
First Claim
Patent Images
1. A method for subcarrier selection for a system employing orthogonal frequency division multiple access (OFDMA) comprising:
- a subscriber unit measuring channel and interference information for a plurality of subcarriers based on pilot symbols received from a base station;
the subscriber unit selecting a set of candidate subcarriers;
the subscriber unit providing feedback information on the set of candidate subcarriers to the base station;
the subscriber unit receiving an indication of subcarriers of the set of subcarriers selected by the base station for use by the subscriber unit; and
the subscriber unit submitting updated feedback information, after being allocated the set of subcarriers to be allocated an updated set of subcarriers, and thereafter the subscriber unit receiving another indication of the updated set of subcarriers.
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4 Petitions
Accused Products
Abstract
A method and apparatus for subcarrier selection for systems is described. In one embodiment, the system employs orthogonal frequency division multiple access (OFDMA). In one embodiment, a method for subcarrier selection comprises each of multiple subscribers measuring channel and interference information for subcarriers based on pilot symbols received from a base station, at least one of subscribers selecting a set of candidate subcarriers, providing feedback information on the set of candidate subcarriers to the base station, and the one subscriber receiving an indication of subcarriers of the set of subcarriers selected by the base station for use by the one subscriber.
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Citations
33 Claims
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1. A method for subcarrier selection for a system employing orthogonal frequency division multiple access (OFDMA) comprising:
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a subscriber unit measuring channel and interference information for a plurality of subcarriers based on pilot symbols received from a base station; the subscriber unit selecting a set of candidate subcarriers; the subscriber unit providing feedback information on the set of candidate subcarriers to the base station; the subscriber unit receiving an indication of subcarriers of the set of subcarriers selected by the base station for use by the subscriber unit; and the subscriber unit submitting updated feedback information, after being allocated the set of subcarriers to be allocated an updated set of subcarriers, and thereafter the subscriber unit receiving another indication of the updated set of subcarriers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An apparatus comprising:
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a plurality of subscriber units in a first cell operable to generate feedback information indicating clusters of subcarriers desired for use by the plurality of subscriber units; and a first base station in the first cell, the first base station operable to allocate OFDMA subcarriers in clusters to the plurality of subscriber units; each of said plurality of subscriber units to measure channel and interference information for the plurality of subcarriers based on pilot symbols received from the first base station and at least one of the plurality of subscriber units to select a set of candidate subcarriers from the plurality of subcarriers, and said at least one subscriber unit to provide feedback information on the set of candidate subcarriers to the base station and to receive an indication of subcarriers from the set of subcarriers selected by the first base station for use by the at least one subscriber unit, and wherein the subscriber unit submits updated feedback information after being allocated the set of subscriber units to receive an updated set of subcarriers and thereafter receives another indication of the updated set of subcarriers. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A method comprising:
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a base station allocating a first portion of a plurality of subcarriers to establish a data link between the base station and a subscriber unit; and the base station allocating a second portion of said plurality of subcarriers to the subscriber unit to increase communication bandwidth, wherein the base station allocates the second portion after allocating each subscriber unit in the cell subcarriers to establish a data link between the base station and said each subscriber unit.
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33. A base station comprising:
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means for allocating a first portion of a plurality of subcarriers to establish a data link between the base station and a subscriber unit; and means for allocating a second portion of said plurality of subcarriers to the subscriber unit to increase communication bandwidth, wherein the base station allocates the second portion after allocating each subscriber unit in the cell subcarriers to establish a data link between the base station and said each subscriber unit.
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Specification
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Litigation Data
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Current AssigneeAdaptix, Inc. (Acacia Research Corporation), J & K Services L.L.C.
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Original AssigneeAdaptix, Inc. (Acacia Research Corporation)
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InventorsLi, Xiaodong, Liu, Hui, Li, Kemin, Zhang, Wenzhong
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Primary Examiner(s)ZEWDU, MELESS NMN
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Application NumberUS11/199,586
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Publication Number
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Time in Patent Office1,198 Days
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Field of Search455/179.1, 455/188.1, 455/422.1, 455516-517, 455/67.11, 455/561, 455/562.1, 455132-135, 4554565-4566, 455/455, 455423-425, 455 631- 632, 455 62- 45, 455 412- 413, 455443-453, 455463-464, 455509-510, 455/553, 455512-513, 455524-526, 455/550.1, 455/168.1, 455/176.1, 455/69, 455/70, 455/266, 455/403, 455/500, 455/556.2, 370203-210, 370/311, 370346-347, 370465-480, 370312-314, 370319-322, 370328-330, 370/338, 370341-344, 370/395.21, 370/395.41, 370/430, 370/437, 370/447, 370/449, 370/458, 370461-462, 370/913, 375/311, 375/240, 375/240.07, 375/240.11
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US Class Current455/450
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CPC Class CodesH04B 17/336 Signal-to-interference rati...H04B 17/345 Interference values signal-...H04J 11/00 Orthogonal multiplex system...H04J 11/003 at the transmitter transmis...H04J 11/005 of intercell interferenceH04L 1/0003 by switching between differ...H04L 1/0005 applied to payload informationH04L 1/0009 by adapting the channel cod...H04L 1/0011 applied to payload informationH04L 1/0025 Transmission of mode-switch...H04L 1/0026 Transmission of channel qua...H04L 1/0079 Formats for control data H0...H04L 1/04 using frequency diversityH04L 25/0226 sounding signals per seH04L 25/0228 with direct estimation from...H04L 27/2601 Multicarrier modulation sys...H04L 27/2602 Signal structureH04L 47/125 by balancing the load, e.g....H04L 5/0007 the frequencies being ortho...H04L 5/0032 Distributed allocation, i.e...View All
