Patent application number | Description | Published |
20080299917 | CLOSED-LOOP MULTIPLE-INPUT-MULTIPLE-OUTPUT SCHEME FOR WIRELESS COMMUNICATION BASED ON HIERARCHICAL FEEDBACK - The present invention provides methods implemented in a base station having a plurality of antennas and one or more user terminals. One embodiment of the method includes receiving feedback from at least one user in response to transmitting a first frame to said at least one user. The first frame is formed by pre-coding at least one symbol using at least one first code word selected from at least one first code book associated with the at least one user. The method also includes transmitting at least one second frame to the user(s). The second frame(s) are pre-coded using at least one second codeword selected from at least one second codebook. The second codebook(s) determined based on the feedback and the first codeword(s). | 12-04-2008 |
20090268657 | Relays in wireless communications - A method is provided, in a wireless communications network comprising a source node, a destination node and at least one relay node, of selecting spatial subchannels for use. The method comprising the steps of: spatially decomposing channels into spatial subchannels; and selecting a subset of the subchannels for use that at least approximately maximises predicted throughput rate. | 10-29-2009 |
20100034151 | METHOD OF JOINT RESOURCE ALLOCATION AND CLUSTERING OF BASE STATIONS - The present invention provides a method for implementation in a first functional entity in a wireless communication system that includes a first plurality of base stations for providing wireless connectivity to at least one mobile unit. In one embodiment of the method includes receiving, at the first functional entity, channel state information associated with a plurality of wireless communication channels between the first plurality of base stations and the mobile unit. Selection of a second plurality of base stations from the first plurality of base stations is performed jointly with resource allocation to the second plurality of base stations using the channel state information. The first functional entity then communicates information indicative of the selected second plurality of base stations and the allocated resources to the selected second plurality of base stations. | 02-11-2010 |
20110211647 | CLOSED-LOOP MULTIPLE-INPUT-MULTIPLE-OUTPUT SCHEME FOR WIRELESS COMMUNICATION BASED ON HIERARCHICAL FEEDBACK - The present invention provides methods implemented in a base station having a plurality of antennas and one or more user terminals. One embodiment of the method includes receiving feedback from at least one user in response to transmitting a first frame to said at least one user. The first frame is formed by pre-coding at least one symbol using at least one first code word selected from at least one first code book associated with the at least one user. The method also includes transmitting at least one second frame to the user(s). The second frame(s) are pre-coded using at least one second codeword selected from at least one second codebook. The second codebook(s) determined based on the feedback and the first codeword(s). | 09-01-2011 |
20130058383 | CLOSED-LOOP MULTIPLE-INPUT-MULTIPLE-OUTPUT SCHEME FOR WIRELESS COMMUNICATION BASED ON HIERARCHICAL FEEDBACK - The present invention provides methods implemented in a base station having a plurality of antennas and one or more user terminals. One embodiment of the method includes receiving feedback from at least one user in response to transmitting a first frame to said at least one user. The first frame is formed by pre-coding at least one symbol using at least one first code word selected from at least one first code book associated with the at least one user. The method also includes transmitting at least one second frame to the user(s). The second frame(s) are pre-coded using at least one second codeword selected from at least one second codebook. The second codebook(s) determined based on the feedback and the first codeword(s). | 03-07-2013 |
20150236769 | CLOSED-LOOP MULTIPLE-INPUT-MULTIPLE-OUTPUT SCHEME FOR WIRELESS COMMUNICATION BASED ON HIERARCHICAL FEEDBACK - The present invention provides methods implemented in a base station having a plurality of antennas and one or more user terminals. One embodiment of the method includes receiving feedback from at least one user in response to transmitting a first frame to said at least one user. The first frame is formed by pre-coding at least one symbol using at least one first code word selected from at least one first code book associated with the at least one user. The method also includes transmitting at least one second frame to the user(s). The second frame(s) are pre-coded using at least one second codeword selected from at least one second codebook. The second codebook(s) determined based on the feedback and the first codeword(s). | 08-20-2015 |
Patent application number | Description | Published |
20120039242 | RELAYING DATA BETWEEN A BASE STATION AND USER EQUIPMENT - A relay operable to relay data between a base station and user equipment of a wireless communications system, a relay-base station pair, methods and computer program products are disclosed. The relay comprises: queuing logic operable, for each user equipment supported by the relay, to form a pending data queue associated with that user equipment, the pending data queue storing received data intended for that user equipment which has yet to be transmitted by the relay over a communications channel between that user equipment and the relay; and scheduling logic operable to schedule transmissions of pending data to each user equipment based on at least one of a size of the pending data queue associated with each user equipment, priority of pending data and channel state information of the communications channel between each user equipment and the relay. In this way, the amount of unnecessary traffic being transmitted between the base station and the relays is reduced, the amount processing resources required in the base station is also reduced and, as a consequence, the deployment of relays within the macro network becomes much more scalable. Accordingly, new relays can be readily deployed where needed without requiring complex and careful network planning. | 02-16-2012 |
20120314611 | CHANNEL STATE INFORMATION FEEDBACK - An apparatus and method for feeding back channel state information are disclosed. The method of providing channel state information for a wireless communications channel provided between a first network node having at least one transmission antenna and a second network node having at least one reception antenna comprises the steps of: estimating a current value of at least a first type of channel state information for at least one sub-channel within the channel from signals received by the at least one reception antenna over the channel from the at least one transmission antenna; determining whether the current value of the first type of channel state information varies from previously-transmitted value for the first type of channel state information by at least a predetermined amount; and if so, transmitting an indicator indicative of the current value for the first type of channel state information to the first network node. | 12-13-2012 |
20130223551 | CHANNEL STATE INFORMATION FEEDBACK - An apparatus and method for feeding back channel state information is disclosed. The method is for providing channel state information for a wireless communications channel provided between a first network node having at least one transmission antenna and a second network node having at least one reception antenna. The method comprises the steps of: determining characteristics of each tap resolvable in the time domain of at least one sub-channel within said channel from signals received by said at least one reception antenna over said channel from said at least one transmission antenna; arranging said characteristics into at least one vector; quantising said at least one vector by selecting one of a plurality of codebook vectors at a first level of a hierarchical codebook of vectors; and providing, to said first network node, an indication of an index to said one of a plurality of codebook vectors. | 08-29-2013 |