Patent application number | Description | Published |
20090040936 | METHOD AND APPARATUS FOR SCHEDULING TRANSMISSIONS IN A WIRELESS COMMUNICATION SYSTEM - Machine-readable media, methods, apparatus and system for scheduling transmissions in a wireless communication system are described. In some embodiments, a base station may comprise a network interface device to receive and process a long-term signal to interference plus noise ratio (SINR) and a channel quality indicator (CQI) from each subscriber station of a plurality of subscriber stations; a reference signal to interference plus noise ratio determining logic to determine a reference signal to interference plus noise ratio (Ref_SINR) for the each subscriber station; and a target fairness factor determining logic to determine a target fairness factor (TFF) for the each subscriber station; a real fairness factor determining logic to determine a real fairness factor (RFF) for the each subscriber station; and a pseudo CQI calculating logic to calculate a pseudo CQI for the each subscriber station based at least in part on the CQI, SINR, Ref_SINR, TFF and RFF. | 02-12-2009 |
20090041138 | EFFICIENT CQICH TRANSPORT FORMAT - An efficient channel quality indicator channel (CQICH) transport method and system are disclosed. The CQICH transport method defines five types of CQI transport formats, to cover known cases of CQI feedback. The CQICH transport method further defines the format of transportation, which enables any of the five types of CQI transport formats to be transmitted. | 02-12-2009 |
20090041148 | OPEN LOOP MU-MIMO - A unified open loop single-user/multiple-user multiple-input-multiple-output (MIMO) system and method are disclosed. The system and method operate without use of channel state information feedback. Instead, the method utilizes channel quality indicator feedback to schedule users to spatial resource blocks. Both symmetric multi-user MIMO schemes (like 2×2 and 4×4) and asymmetric multi-user MIMO schemes are considered. CQI feedback and reduction proposals are also introduced. The method may be used in a proposed network topology. | 02-12-2009 |
20090042617 | BEAM SELECTION IN OPEN LOOP MU-MIMO - A beam selection method in open loop MU-MIMO is disclosed, for an asymmetric antenna configuration. The proposed beam selection method employs limited feedback, as compared with single-user closed-loop MIMO and multiple-user closed-loop MIMO, in which the base station requires channel state information (CSI). The multi-user MIMO beam selection method selects the portion of beams from candidate beams for data transmission, meaning that the base station is training M beams. From this, the subscriber station selects N beams from the total M beams, with N≦M. | 02-12-2009 |
20090047987 | METHOD AND APPARATUS FOR ALLOCATING POWER IN A MU-MIMO COMMUNICATION SYSTEM - Machine-readable media, methods, apparatus and system for allocating power in a MU-MIMO communicating system are described. In some embodiments, an apparatus of a base station in the MU-MIMO communication system may comprise: a power calculating logic to calculate a power for each user of a plurality of users communicating with the base station in the MU-MIMO system, based upon an average power and a power increment. The power calculating logic may further comprise an average power logic to calculate the average power among the plurality of users based upon a total power for the base station to communicate with the plurality of users, and a power increment logic to determine the power increment for the each user based upon at least one of a fairness algorithm and a throughput algorithm, and wherein different users of the plurality of users having different long-term signal to interference plus noise ratios (SINRs) are calculated with different powers. The apparatus may further comprise a power allocating logic to allocate the power to the each user. | 02-19-2009 |
20090245153 | MULTIUSER SECTOR MICRO DIVERSITY SYSTEM - Embodiments of methods and apparatus for a multiuser sector micro diversity system are described herein. Other embodiments may be described and claimed. | 10-01-2009 |
20100035644 | HYBRID, MULTIPLE CHANNEL, AND TWO-STEP CHANNEL QUALITY INDICATOR (CQI) FEEDBACK SCHEMES - A method providing channel quality indicator (CQI) feedback from subscriber stations (SSs) to a base station (BS) may include a combination of a thresholding scheme and a best-M scheme. Another method providing CQI feedback may include providing multiple feedback channels, with SSs randomly allocating CQI values among the multiple feedback channels. The BS may choose a prevailing CQI message when channel contention occurs. Another method of providing CQI feedback may include SSs transmitting to the BS numbers of their CQI values that exceed a CQI threshold. Based on these numbers, the BS may determine how many CQI values each SS may send, and on which channels. The SSs may send these CQI values according to instructions from the BS. | 02-11-2010 |
20100056216 | Techniques utilizing adaptive codebooks for beamforming in wireless networks - An embodiment of the present invention provides a method, comprising using an adaptive codebook for beamforming for communications in wireless networks. | 03-04-2010 |
20100272047 | FEEDBACK CHANNEL RELEASE - Briefly, in accordance with one or more embodiments, a communication link is established between a base station and a mobile station. The base station transmits a feedback allocation to the mobile station for the allocation of the resources of a feedback channel. If the feedback allocation is to be terminated, the base station transmits a feedback deallocation to the mobile station. If the feedback deallocation is successful, the mobile station transmits a deallocation confirmation to the base station to confirm receipt of the feedback deallocation. | 10-28-2010 |
20100273435 | UPLINK FEEDBACK CHANNEL REPORTING MECHANISM IN WIRELESS SYSTEMS - An uplink feedback channel reporting method is disclosed for using the primary and secondary fast feedback channels to efficiently report the channel quality, MIMO feedback, and CQI types of data from a mobile station to a base station. The reporting method reports regular information periodically and non-regular information on demand. | 10-28-2010 |
20110002372 | DOWNLINK CHANNEL PARAMETERS DETERMINATION FOR A MULTIPLE-INPUT-MULTIPLE-OUTPUT (MIMO) SYSTEM - Embodiments of methods and apparatus for providing downlink channel parameters determination for downlink channels associated with a multiple-input-multiple-output (MIMO) system are generally described herein. Other embodiments may be described and claimed. | 01-06-2011 |
20110009076 | PROVIDING CQI FEEDBACK WITH COMMON CODE RATE TO A TRANSMITTER STATION - Methods and apparatuses for providing CQI feedback with common code rate to a transmitter station are described herein. In one implementation, the methods may include a receiver station that is communicatively linked to a transmitter station via k spatial channels transmitting a first CQI to the transmitter station that indicates a modulation level for use by the transmitter station to transmit (i.e., to configure for transmission) a first of k streams of signals to be transmitted to the receiver station. The first CQI may further include a common code rate to be used by the transmitter station for transmitting the first of the k streams of signals as well as for transmitting the rest of the k−1 additional streams of signals to the receiver station. The receiver station may further transmit to the transmitter station k−1 additional CQIs to indicate to the transmitter station the k−1 modulation levels to be used by the transmitter station for transmitting the k−1 additional streams of signals to the receiver station. | 01-13-2011 |
20110013603 | Techniques for MIMO beamforming for frequency selective channels in wireless communication systems - An embodiment of the present invention provides an apparatus that may include a transceiver operable as a base station (BS) in a wireless network and adapted for multiple input multiple output (MIMO) beamforming and further adapted for wireless communication with a receiver that feeds back to the transceiver a plurality of beamforming matrixes per subband and interpolates the beamforming matrixes across the subband. | 01-20-2011 |
20110075752 | NON-UNITARY PRECODING SCHEME FOR WIRELESS COMMUNICATIONS - Techniques for a non-unitary precoding scheme for wireless communications are described. An apparatus may comprise a mobile device for a mobile broadband communications system utilizing an orthogonal frequency-division multiple access technique. The mobile device may have a channel state information module operative to generate channel state information for a fixed device using a non-unitary precoding scheme for a closed loop multi-user multiple-input and multiple-output scheme. The channel state information may comprise channel quality information and a codeword index. Other embodiments are described and claimed. | 03-31-2011 |
20110158218 | Techniques utilizing step size adaptation for differential beamforming in wireless networks - An embodiment of the present invention provides a method used in transmit beam forming, comprising, providing differential feedback by using variable differential codebooks across a plurality of feedbacks wherein the differential codebooks may have different shapes, and/or spans, and/or the numbers of codewords across feedbacks. | 06-30-2011 |
20110294438 | PROVIDING CQI FEEDBACK WITH COMMON CODE RATE TO A TRANSMITTER STATION - Methods and apparatuses for providing CQI feedback to a transmitter station are described herein. In one implementation, an apparatus may include a transceiver to transmit and receive signals to and from a transmitter station, and a controller coupled to the transceiver to control the transceiver to transmit to the transmitter station a first channel quality indicator (CQI) that corresponds to a first modulation level to be used by the transmitter station to transmit first signals, and to control the transceiver to transmit to the transmitter station a differential indicator that comprises two bits or less to differentially indicate a second CQI relative to the first CQI, wherein the second CQI corresponds to a second modulation level to be used by the transmitter station to transmit second signals. Other embodiments may be described and/or claimed. | 12-01-2011 |
20120275497 | DOWNLINK CHANNEL PARAMETERS DETERMINATION FOR A MULTIPLE-INPUT-MULTIPLE-OUTPUT (MIMO) SYSTEM - Embodiments of methods and apparatus for providing downlink channel parameters determination for downlink channels associated with a multiple-input-multiple-output (MIMO) system are generally described herein. Other embodiments may be described and claimed. | 11-01-2012 |
20130188585 | UPLINK FEEDBACK CHANNEL REPORTING MECHANISM IN WIRELESS SYSTEMS - An uplink feedback channel reporting method is disclosed for using the primary and secondary fast feedback channels to efficiently report the channel quality, MIMO feedback, and CQI types of data from a mobile station to a base station. The reporting method reports regular information periodically and non-regular information on demand. | 07-25-2013 |
20140169341 | UPLINK CHANNEL ESTIMATION FOR A SOFTWARE DEFINED RADIO - A system and method for uplink channel estimation for a software defined radio is disclosed. The method comprises dividing an allocated bandwidth for a received signal on the uplink channel into N segments. The uplink channel estimation is processed for each of the N segments as a separate process. The uplink channel estimation includes pre-processing each of the N segments of the received signal; Wiener filtering the pre-processed segments of the received signal in the frequency domain; and Wiener filtering each of the frequency filtered segments in the time domain to determine a channel estimate for each of the N segments for use in equalizing the received signal. | 06-19-2014 |
20140185542 | DOWNLINK CHANNEL PARAMETERS DETERMINATION FOR A MULTIPLE-INPUT-MULTIPLE-OUTPUT (MIMO) SYSTEM - Embodiments of methods and apparatus for providing downlink channel parameters determination for downlink channels associated with a multiple-input-multiple-output (MIMO) system are generally described herein. Other embodiments may be described and claimed. | 07-03-2014 |
20140269322 | COOPERATIVE RADIO ACCESS NETWORK WITH CENTRALIZED BASE STATION BASEBAND UNIT (BBU) PROCESSING POOL - Embodiments of an enhanced Node B (eNB) configured for use in a cooperative radio access networks (C-RAN) and method for central baseband unit (BBU) processing are generally described herein. In some embodiments, the eNB may include a baseband unit (BBU) processing pool comprising a plurality of processing units. The BBU processing pool is configured to share the processing load of several sectors. A control unit may monitor the processing load of the processing units and perform dynamic load sharing by migrating the baseband processing between the processing units without changing a carrier used by user equipment operating with a sector. | 09-18-2014 |
20140269968 | METHOD AND APPARATUS USING A BASE CODEBOOK STRUCTURE FOR BEAMFORMING - Techniques for a precoding scheme for wireless communications are described. A method and apparatus may comprise a first device for a communications system to determine a beamforming structure for a closed loop transmit beamforming scheme using channel information, one or more scaling factors and one or more integers to represent a complex vector. The beamforming structure may include a codeword, a codebook and a codeword index. Other embodiments are described and claimed. | 09-18-2014 |