Abstract:
PROBLEM TO BE SOLVED: To provide omni-directional antennas providing space diversity to copw with multipath phasing. SOLUTION: An access point may use two omni-directional antennas (1) or one omni-directional antenna and a plurality of sectored antennas (3) in a communications network. The mobile stations may use sectored antennas. The omni-directional antennas may include two or more sectored antennas (2). COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide methods for contention-based transmission for reduced latency in LTE Advanced networks.SOLUTION: User equipment (UE) transmits a contention sequence on a physical uplink control channel (PUCCH) to an enhanced-Node B (eNB) and concurrently transmits data requesting uplink resources on a physical uplink shared channel (PUSCH) to the eNB. The contention sequence is transmitted on the PUCCH in accordance with a format that is assigned by the eNB. The contention sequence is either randomly selected by the UE or assigned by the eNB. When the contention sequence and data are not successfully received by the eNB, the UE falls back to a more conventional random access channel (RACH) procedure for uplink resource allocation.
Abstract:
PROBLEM TO BE SOLVED: To provide methods and apparatus of determining downlink channel parameters for a MIMO system.SOLUTION: Embodiments of methods and apparatus for providing downlink channel parameters determination for downlink channels associated with a MIMO system are described. A method comprising: collecting, by a transmitter station, information associated with one or more uplink channels of a MIMO system employed to communicate with at least one receiver station; computing channel quality information for a plurality of downlink channels based at least in part on the information associated with the one or more uplink channels; and determining one or more downlink channel parameters for use by the transmitter station to transmit signals to the at least one receiver station, via one or more of the downlink channels, based at least in part on the channel quality information. Other embodiments are also described.
Abstract:
PROBLEM TO BE SOLVED: To provide an enhanced bidirectional beam forming protocol to perform bidirectional beam forming operations to reduce training overhead and link latency during beam forming operations.SOLUTION: A wireless device has an antenna control module operative to initiate beam formation operations using an iterative training scheme to form a set of communications channels for a wireless network. The antenna control module transmits training signals and feedback information to a peer device via a transceiver and a phased antenna array using partially or fully formed high rate channels, and iteratively determines antenna-array weight vectors for a directional transmit beam pattern for the phased antenna array using feedback information from the peer device.
Abstract:
PROBLEM TO BE SOLVED: To reduce the amount of overhead for bandwidth requests, and reduce increase in the latency caused by collisions of simultaneously submitted bandwidth requests.SOLUTION: Uplink bandwidth request messages are received on a bandwidth request contention channel from one or more subscriber stations. The uplink bandwidth request messages are generated by the subscriber stations by modulating pilot subcarriers of a randomly selected disjoint pilot pattern with a selected orthogonal sequence. The base station allocates uplink bandwidth to the subscriber stations when the uplink bandwidth request messages are successfully detected and decoded. The base station uses an SDMA technique to determine channel responses based on the orthogonal sequences to detect and decode the uplink bandwidth request messages.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for reducing co-channel interference by exploiting multiple base station transmit cooperation (MBSC) and single base station transmit nulling (SBSN).SOLUTION: Base stations (BS1 to BS3) may transmit at varied power levels. Subscriber stations A receiving the power levels can transmit noise information back to the base station. As a result, co-channel interference can be determined from the varied power transmissions, either in the base station or in the subscriber station. In addition, in some embodiments, the transmissions may include different phases so that the phase of the co-channel interference may be determined as well.
Abstract:
PROBLEM TO BE SOLVED: To provide methods and apparatus of determining downlink channel parameters for a MIMO system.SOLUTION: Embodiments of methods and apparatus for providing downlink channel parameters determination for downlink channels associated with a MIMO system are described. A method comprising: collecting, by a transmitter station, information associated with one or more uplink channels of a MIMO system employed to communicate with at least one receiver station; computing channel quality information for a plurality of downlink channels based at least in part on the information associated with the one or more uplink channels; and determining one or more downlink channel parameters for use by the transmitter station to transmit signals to the at least one receiver station, via one or more of the downlink channels, based at least in part on the channel quality information. Other embodiments are also described.