OFDMA with adaptive subcarrier-cluster configuration and selective loading
DC CAFC- US 6,947,748 B2
- Filed: 12/15/2000
- Issued: 09/20/2005
- 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 measuring channel and interference information for a plurality of subcarriers based on pilot symbols received from a base station, wherein the subscriber measuring channel and interference information comprises the subscriber continuously monitoring reception of the pilot symbols known to the base station and measuring signal-plus-interference-to-noise ratio (SINR) of each cluster of subcarriers, and the subscriber measuring intra-cell traffic;
the subscriber selecting a set of candidate subcarriers, wherein the subscriber selects candidate subcarriers based, at least in part, on the intra-cell traffic load balancing;
the subscriber providing feedback information on the set of candidate subcarriers to the base station; and
the subscriber receiving an indication of subcarriers of the set of subcarriers selected by the base station for use by the subscriber.
9 Assignments
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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
23 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 measuring channel and interference information for a plurality of subcarriers based on pilot symbols received from a base station, wherein the subscriber measuring channel and interference information comprises the subscriber continuously monitoring reception of the pilot symbols known to the base station and measuring signal-plus-interference-to-noise ratio (SINR) of each cluster of subcarriers, and the subscriber measuring intra-cell traffic;
the subscriber selecting a set of candidate subcarriers, wherein the subscriber selects candidate subcarriers based, at least in part, on the intra-cell traffic load balancing;
the subscriber providing feedback information on the set of candidate subcarriers to the base station; and
the subscriber receiving an indication of subcarriers of the set of subcarriers selected by the base station for use by the subscriber. - View Dependent Claims (2)
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3. A method for subcarrier selection for a system employing orthogonal frequency division multiple access (OFDMA) comprising:
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a subscriber measuring channel and interference information for a plurality of subcarriers based on pilot symbols received from a base station, wherein the subscriber measuring channel and interference information comprises using information from pilot symbol periods and data periods to measure channel and interference information;
the subscriber selecting a set of candidate subcarriers based on the SINR of a cluster of subcarriers and a difference between measured power corresponding to each cluster during pilot periods and measured power during data periods;
the subscriber providing feedback information on the set of candidate subcarriers to the base station; and
the subscriber receiving an indication of subcarriers of the set of subcarriers selected by the bas station for use by the subscriber. - View Dependent Claims (4)
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5. A method for subcarrier selection for a system employing orthogonal frequency division multiple access (OFDMA) comprising:
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a subscriber measuring channel and interference information for a plurality of subcarriers based on pilot symbols received from a base station, wherein the subscriber measuring channel and interference information comprises using information from pilot symbol periods and data periods to measure channel and interference information, and using information from pilot symbol periods and data traffic periods to analyze presence of intra-cell traffic load and inter-cell interference;
the subscriber selecting a set of candidate subcarriers;
the subscriber providing feedback information on the set of candidate subcarriers to the base station; and
the subscriber receiving an indication of subcarriers of the set of subcarriers selected by the base station for use by the subscriber.
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6. A method for subcarrier selection for a system employing orthogonal frequency division multiple access (OFDMA) comprising:
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a subscriber measuring channel and interference information for a plurality of subcarriers based on pilot symbols received from a base station;
the subscriber selecting a set of candidate subcarriers;
the subscriber providing feedback information on the set of candidate subcarriers to the base station, wherein providing feedback information comprises arbitrarily ordering the set of candidate of subcarriers as clusters of subcarriers, and further wherein the feedback information includes an index indication of a candidate cluster with its SINR value; and
the subscriber receiving an indication of subcarriers of the set of subcarriers selected by the base station for use by the subscriber. - View Dependent Claims (7)
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8. A method for subcarrier selection for a system employing orthogonal frequency division multiple access (OFDMA) comprising:
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a subscriber measuring channel and interference information for a plurality of subcarriers based on pilot symbols received from a base station;
the subscriber selecting a set of candidate subcarriers;
the subscriber providing feedback information on the set of candidate subcarriers to the base station;
the subscriber sending an indication of coding and modulation rates that the subscriber desires to employ for each cluster; and
the subscriber receiving an indication of subcarriers of the set of subcarriers selected by the base station for use by the subscriber. - View Dependent Claims (9)
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10. A method for subcarrier selection for a system employing orthogonal frequency division multiple access (OFDMA) comprising:
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a subscriber measuring channel and interference information for a plurality of subcarriers based on pilot symbols received from a base station;
the subscriber selecting a set of candidate subcarriers;
the subscriber providing feedback information on the set of candidate subcarriers to the base station;
the subscriber receiving an indication of subcarriers of the set of subcarriers selected by the base station for use by the subscriber;
the base station allocating a first portion of the subcarriers to establish a data link between the base station and the subscriber; and
thenthe base station allocating a second portion of the subcarriers to the subscriber to increase communication bandwidth wherein, due to subscriber priority, the base station allocates the second portion before allocating each subscriber in the cell subcarriers to establish their data link to the base station.
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11. An apparatus comprising:
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a plurality of subscribers in a first cell to generate feedback information indicating clusters of subcarriers desired for use by the plurality of subscribers; and
a first base station in the first cell, in response to receiving inter-cell interference information, coordinates with other cells to make a cluster assignment decision, the first base station performing subcarrier allocation for OFDMA to allocate OFDMA subcarriers in clusters to the plurality of subscribers based on inter-cell interference avoidance and intra-cell traffic load balancing in response to the feedback information.
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12. An apparatus comprising:
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a plurality of subscribers in a first cell to generate feedback information indicating clusters of subcarriers desired for use by the plurality of subscribers; and
a first base station in the first cell, the first base station to allocate OFDMA subcarriers in clusters to the plurality of subscribers;
each of a plurality of subscribers to measure channel and interference information for the plurality of subcarriers based on pilot symbols received from the first base station, wherein each of the plurality of subscribers continuously monitors reception of the pilot symbols known to the base station and the plurality of subscribers, measures signal-plus-interference-to-noise ratio (SINR) of each cluster of subcarriers and measures intra-cell traffic, and further wherein at least one subscriber of the plurality of subcarriers based, at least in part, on the intra-cell traffic load balancing, and the one subscriber to provide feedback information on the set of candidate subcarriers to the base station and to receive an indication of subcarriers form the set of subcarriers selected by the first base station for use by the one subscriber. - View Dependent Claims (13)
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14. An apparatus comprising:
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a plurality of subscribers in a first cell to generate feedback information indicating clusters of subcarriers desired for use by the plurality of subscribers; and
a first base station in the first cell, the first base station to allocate OFDMA subcarriers in clusters to the plurality of subscribers;
each of a plurality of subscribers to measure channel and interference information for the plurality of subcarriers based on pilot symbols received from the first base station, wherein at least one subscriber of the plurality of subscribers select a set of candidate subcarriers from the plurality of subcarriers based, at least in part, on SINR of the cluster and a difference between measured power corresponding to each cluster during pilot periods and measured power during data periods, and the one subscriber 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 one subscriber. - View Dependent Claims (15, 16, 17, 18)
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19. An apparatus comprising:
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a plurality of subscribers in a first cell to generate feedback information indicating clusters of subcarriers desired for use by the plurality of subscribers; and
a first base station in the first cell, the first base station to allocate OFDMA subcarriers in clusters to the plurality of subscribers;
each of a plurality of subscribers 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 subscribers to select a set of candidate subcarriers from the plurality of subcarriers, and the one subscriber 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 one subscriber, wherein the plurality of subscribers provide feedback information that comprises an arbitrarily ordered set of candidate subcarriers as clusters of subcarriers, and further wherein the feedback information includes an index indication of a candidate cluster with it SINR value. - View Dependent Claims (20)
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21. An apparatus comprising:
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a plurality of subscribers in a first cell to generate feedback information indicating clusters of subcarriers desired for use by the plurality of subscribers; and
a first base station in the first cell, the first base station to allocate OFDMA subcarriers in clusters to the plurality of subscribers;
each of a plurality of subscribers 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 subscribers to select a set of candidate subcarriers from the plurality of subcarriers, and the one subscriber 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 one subscriber, wherein the one subscriber sends an indication of coding and modulation rates that the one subscriber desires to employ. - View Dependent Claims (22)
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23. An apparatus comprising:
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a plurality of subscribers in a first cell to generate feedback information indicating clusters of subcarriers desired for use by the plurality of subscribers; and
a first base station in the first cell, the first base station to allocate OFDMA subcarriers in clusters to the plurality of subscribers; and
each of a plurality of subscribers 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 subscribers to select a set of candidate subcarriers from the plurality of subcarriers, and the one subscriber 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 one subscriber;
wherein the base station allocates a first portion of the subcarriers to establish a data link between the base station, the base station allocates a second portion of the subcarriers to the subscriber to increase communication bandwidth, and due to subscriber priority, the base station allocates the second portion before allocating each subscriber in the cell subcarriers to establish their data link to the base station.
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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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InventorsZhang, Wenzhong, Li, Xiaodong, Liu, Hui, Li, Kemin
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Primary Examiner(s)Trost, William
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Assistant Examiner(s)ZEWDU, MELESS NMN
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Application NumberUS09/738,086
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Publication Number
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Time in Patent Office1,740 Days
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Field of Search455447-453, 455/456.5, 455/456.6, 455/509, 455/512, 455/513, 455524-526, 455/62, 455/63.1, 455/455, 455/463, 455/464, 455/168.1, 455/176.1, 455/179.1, 455/188.1, 455/550.1, 455/553, 370/311, 370/347, 370/480, 370203-206, 370/208, 370/210, 370/329, 375/132
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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
