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| 20090067533 | MIMO BASED NETWORK CODING NETWORK - A wireless communication system includes an intermediate node, a first node and a second node. There is described a method for implementing MIMO based network coding, comprising the first node transmitting first data to the intermediate node, and the second node transmitting second data to the intermediate node. Both the first node and the second node may use spatial multiplexing or time division multiplexing or frequency division multiplexing on a common/different resource. The intermediate node receives the transmissions from the first node and second node, and performs network coding on the first data and second data using a predefined network coding scheme to produce network coded information. The intermediate node transmits the network coded information to the first node and second node using multi-user MIMO; and; each first or second node receives the MIMO transmissions from the intermediate node and applies network decoding procedures to recover the first data and second data. Network coding schemes include Decode and Forward (DF), Map and Forward (MF) and Amplify and Forward (AF). The first node and second node may be members of groups of nodes all within the same coverage area. A method for scheduling MIMO-based network coded transmissions is also described. Hybrid Automatic Repeat Request (HARQ) transmission may also be network encoded. | 03-12-2009 |
| 20100278123 | WIRELESS COMMUNICATION FRAME STRUCTURE AND APPARATUS - A method comprises providing a frame, the frame including a downlink sub-frame and an uplink sub-frame, portions of the downlink sub-frame and uplink sub-frame being allocated for communication with a mobile station configured to operate utilizing a legacy IEEE 802.16 standard, and portions of the downlink sub-frame and uplink sub-frame being allocated for communication with a mobile station configured to operate utilizing the IEEE 802.16m standard; and using the frame to wirelessly communicate with a mobile station in at least one of the uplink and downlink directions. A method of using an 802.16m frame structure for multi-band operation is also provided, as well as an 802.16m frame structure for relay support. | 11-04-2010 |
| 20110086662 | METHODS FOR CONTROL SIGNALING FOR WIRELESS SYSTEMS - To effectively and efficiently provide control information, a broadcast pointer channel (BPCH) may be used to identify the type and perhaps relative location of control information that is being provided in a given frame structure, such as a sub-frame, frame, or superframe. A sub-frame (or like framing entity, such a frame or superframe) may have a BPCH and a corresponding system control information segment in which control information may reside. The system control information segment may have any number of control information blocks, wherein each control information block that is present may correspond to a particular type of control information. The BPCH is used to identify the type of control information that is present in a corresponding system control information segment, and if needed or desired, the relative locations of the various control information. | 04-14-2011 |
| 20110164701 | SYSTEMS AND METHODS OF ENCODING USING A REDUCED CODEBOOK WITH ADAPTIVE RESETTING - To feedback MIMO channel conditions, a codeword from a codebook is selected. To reduce signalling, the codewords are organized into codeword subsets. The receiver signals an index of a codeword into a current codeword subset previously made known to the transmitter. The current codeword subset is adaptively selected based on a threshold criterion. For example, if the best codeword from the current codeword subset is not sufficiently similar to the best codeword in the full codebook, a switch in the codeword subset is made. | 07-07-2011 |
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| 20110041027 | METHODS AND SYSTEMS FOR HARQ PROTOCOLS - Methods described herein are for wireless communication systems. One aspect of the invention is directed to a method for a HARQ process, in which the HARQ process includes a first transmission of an encoder packet and at least one retransmission. The method involves allocating a transmission resource for each respective transmission. The method involves transmitting control information from a base station to a mobile station for each respective transmission. The control information includes information to uniquely identify the HARQ process and an identification of one of a time resource, a frequency resource and a time and frequency resource that is allocated for the transmission. In some embodiments of the invention, specific control information is signalled from a base station to a mobile station to enable RAS-HARQ operation. In some embodiments of the invention, retransmission signaling in included as part of regular unicast signaling used for both first transmission and retransmissions. In some embodiments of the invention, a 3-state acknowledgement channel and associated error recovery operation enables the base station and mobile station to recover from control signaling error and reduce packet loss. | 02-17-2011 |
| 20110051835 | UPLINK MIMO TRANSMISSION FROM MOBILE COMMUNICATIONS DEVICES - A method of uplink transmission from a mobile device having multiple antennas to a base station having multiple antennas includes transmitting in an open-loop single-user MIMO mode when the mobile device is at high speed, transmitting in a closed-loop single-user MIMO mode when the mobile device is at low speed, and, upon request, transmitting in a multi-user collaborative MIMO mode. The method also includes controlling uplink transmissions in a selected one of the open-loop single-user MIMO, the closed-loop single-user MIMO and the multi-user collaborative MIMO modes. Uplink transmissions from the mobile device may be transmitted using multiple antennas of the mobile device. Upon request, the mobile device may switch to transmitting in multi-user collaborative MIMO mode with a subset of the multiple antennas. | 03-03-2011 |
| 20110122811 | Codebook restructure, differential encoding/decoding and scheduling - A method and apparatus for feedback of channel information characterizing a wireless transmission between a base station and a mobile station. The method involves, at the base station, locating in a codebook of predetermined channel responses a predetermined channel response identified by: a primary identifier identifying a cluster associated with a channel response generated by a mobile station; and a differential identifier identifying channel response member within the cluster identified by the primary identifier. The predetermined channel responses are grouped in a plurality of clusters in accordance with a correlation criterion, each cluster including a plurality of predetermined channel response members. The method also involves generating a control signal for controlling transmissions to the mobile station in accordance with the located predetermined channel response. A method and apparatus for feedback of channel information characterizing a wireless transmission between a mobile station and a base station are also disclosed. | 05-26-2011 |
| 20110122846 | UPLINK CONTROL SIGNAL DESIGN FOR WIRELESS SYSTEM - Transmission of uplink control message for a wireless system. The uplink control message may be encoded according to one of multiple possible schemes. The choice of encoding scheme may be made based on the control message size and/or based on the available transmission resources and/or based on the detection scheme used on the receiving end. A modulation scheme may also be selected based on such factors. CDM may be used for certain control messages. Block code encoding, such as Reed-Muller encoding may be used for certain control messages. Different transmission resources may be allocated for different control message uses. The encoding specifics may be selected to obtain a certain hamming distance and/or size of the encoded message or based on other factors. | 05-26-2011 |
| 20110122963 | CODEBOOK RESTRUCTURE, DIFFERENTIAL ENCODING/DECODING, AND SCHEDULING - There is disclosed a method for feedback of channel information characterizing a wireless transmission between a base station and a mobile station over a communications channel. The method involves: receiving a primary identifier identifying a cluster associated with a channel response generated by a mobile station; receiving a differential identifier identifying channel response member within the cluster identified by the primary identifier; locating in a codebook of predetermined channel responses a predetermined channel response identified by said primary identifier and said differential identifier, the predetermined channel responses in the codebook being grouped in a plurality of clusters in accordance with a correlation criterion, each cluster including a plurality of predetermined channel response members; and generating a control signal for controlling transmissions to the mobile station in accordance with said located predetermined channel response. | 05-26-2011 |
| 20110128871 | Optimizing downlink communications between a base station and a remote terminal by power sharing - A method of optimizing downlink communications between a base station and mobile stations in a wireless communication system involves: identifying users that have a modulation control scheme (MCS) power value greater than a reference power value as high power users; for each of the high power users, calculating a power difference being a difference between a geometry value associated with each of the high power users and a reference geometry value associated with the reference power value respectively; summing the power differences in a power pool; identifying users that have an MCS power value below the reference power value as low power users; associating increased geometry values with at least some of the low power users while depleting the power pool by corresponding amounts until the power pool is depleted; and determining new MCSs for at least some of the low power users based on the increased geometry values. | 06-02-2011 |
| 20110130165 | METHODS OF POWER SHARING FOR DL CONTROL TRANSMISSION - A method of optimizing downlink communications between a base station and mobile stations in a wireless communication system involves: identifying users that have a modulation control scheme (MCS) power value greater than a reference power value as high power users; for each of the high power users, calculating a power difference being a difference between a geometry value associated with each of the high power users and a reference geometry value associated with the reference power value respectively; summing the power differences in a power pool; identifying users that have an MCS power value below the reference power value as low power users; associating increased geometry values with at least some of the low power users while depleting the power pool by corresponding amounts until the power pool is depleted; and determining new MCSs for at least some of the low power users based on the increased geometry values. | 06-02-2011 |
| 20110149846 | UPLINK CONTROL SIGNAL DESIGN FOR WIRELESS SYSTEM - Transmission of uplink control message for a wireless system. The uplink control message may be encoded according to one of multiple possible schemes. The choice of encoding scheme may be made based on the control message size and/or based on the available transmission resources and/or based on the detection scheme used on the receiving end. A modulation scheme may also be selected based on such factors. CDM may be used for certain control messages. Block code encoding, such as Reed-Muller encoding may be used for certain control messages. Different transmission resources may be allocated for different control message uses. The encoding specifics may be selected to obtain a certain hamming distance and/or size of the encoded message or based on other factors. | 06-23-2011 |
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| 20090037442 | Reconfiguring Propagation Streams in Distributed Information Sharing - Splitting and merging database object information sharing streams. Streams are also referred to herein as “propagations”. Splitting and merging information sharing streams can be used to improve performance in a information sharing environment when a failed or slow DBS impacts the performance. In one embodiment, an auto split process monitors the progress of applying changes at each node and detects the presence of a failed or a slow node. Once the failed or slow node is identified, the auto split process splits the propagation such that the offending node is sent through a separate propagation. Furthermore, an auto merge process can be started to monitor the newly created separate propagation. At a later point, the new propagation can be merged back into the original stream. For example, if the offending node catches up with other nodes, the auto merge process merges the newly created propagation back to the original propagation. | 02-05-2009 |
| 20090037553 | Configuring or Reconfiguring a Multi-Master Information Sharing Environment - Configuring an n-way multi-master information sharing topology. Adding a new node (e.g., database server) to the information sharing topology can be implemented as follows. Initially, the new node is added as a slave of a particular co-master in the information sharing topology. The objects to replicate are instantiated on the new node by propagating data from the particular co-master to the new node. Furthermore, a capture process is created on the particular co-master to send changes to the objects to the slave. Meanwhile, the co-masters continue to propagate changes to each other. To promote the slave to a master, changes to objects stored at the slave are propagated to each of the co-masters. Furthermore, changes at each of the masters are propagated to the promoted node. | 02-05-2009 |
| 20090125563 | REPLICATING AND SHARING DATA BETWEEN HETEROGENEOUS DATA SYSTEMS - In accordance with an embodiment of the present invention, a heterogeneous data sharing mechanism comprising a capture process and an apply process may be provided in a database system. The capture process mines or receives, at the source entity, a plurality of records that belong to a plurality of transactions. Here, first records from a first transaction in the plurality of transactions are interleaved with one or more records from one or more different transactions in the plurality of transactions. The capture process orders the plurality of records into a stream of ordered records such that all records that belong to a transaction are stored contiguously in a single block of records in the stream. Subsequently, the capture process sends the stream of ordered records from the source entity to the sink entity. Alternatively, the apply process retrieves the stream of ordered records from the capture process. | 05-14-2009 |
