Abstract:
PROBLEM TO BE SOLVED: To efficiently utilize limited amounts of bandwidth for redundant information communication in improved ARQ mechanisms. SOLUTION: Different NAK signals are used to indicate different relative levels in regard to an unsuccessful attempt to decode a received signal. An ACK signal is used in the case of successful decoding. A device which generates and transmits the original encoded signal receives the NAK signal and selects a portion of redundant information, e.g., additional error correction bits, to be transmitted based on the value of the NAK signal. If the NAK signal indicates a low level decoding success, indicating a relatively large number of errors in the decoded signal, a large set of redundant information is selected and transmitted. If the NAK signal indicates a relatively successful decoding, e.g., relatively few errors, a small set of redundant information is selected and transmitted. When a small set of redundant information is transmitted, new information can be transmitted with the redundant information. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and apparatus for wireless network connectivity.SOLUTION: Methods and apparatus which allow a wireless terminal (302) to simultaneously maintain connections with multiple base stations (304, 306) are described. Each wireless terminal (302) is capable of supporting multiple separate timing loops and/or other control loops for each base station connection, thereby allowing the connections to operate independently and in parallel. Different control signals and/or data are transmitted on each connection that is established with a base station (302, 306). In this manner, base stations (302, 306) receive different data allowing asynchronous data transmission. The data received by the base stations (302, 306) can be supplied to a wired asynchronous network (308) without the need to combine the received data prior to supplying it to the wired network (308). The communications techniques of the invention can be used to implement soft handoffs without the need to duplicate data transmissions to multiple base stations.
Abstract:
PROBLEM TO BE SOLVED: To establish the timing synchronization of a wireless terminal using OFDM signaling supporting connectivity with both of a terrestrial base station and a satellite base station. SOLUTION: The OFDM signal is used in the synchronization processing for uplink signaling and downlink signaling to perform first uplink timing synchronization processing for determining whether a base station to which the communication terminal desires to transmit an OFDM uplink signal is the satellite base station, and second uplink timing synchronization processing which is different from the first uplink timing synchronization processing for determining whether the base station is the terrestrial base station. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide methods and apparatus for selecting between multiple carriers based on signal energy measurements. SOLUTION: Although a receiver is tuned to a single band, based on the relative energy of beacon signal components corresponding to the currently used carrier and beacon signal components corresponding to an alternative carrier, a carrier selection and a handoff determination are made. Mobile nodes receive a signal within a first selected carrier band including components from different transmitters, e.g., a first signal component identified with the first currently selected band and a second signal component identified with a second alternative band. The signal components, e.g., beacon signal components from different transmitters may be obtained from a signal which corresponds to multiple symbol transmission time periods. Separate signal energy measurements are performed on the first and second signal components. The signal component energy is compared, and a determination is made as to whether a handoff should be initiated. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide methods and apparatuses for determining, communicating and using information which can be used for interference control purposes. SOLUTION: Wireless terminals measure signals transmitted from one or more base stations, e.g., base station sector transmitters (1010, 1014). The measured signals may be, e.g., beacon signals and/or pilot signals. From the measured signals, the wireless terminal generates one or more gain ratios which provide information about the relative gain of the communications channels from different base station sectors to the wireless terminal (1018). On the basis of signal energy measurements and relative gains generated from the energy measures, reports are generated and sent to one or more base stations. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an improved beacon signaling method for facilitating accurate energy detection and timing synchronization with a transmitter. SOLUTION: Beacon signals of a narrow band are transmitted on the same tone in at least two consecutive symbol periods with at least 60% power against a transmitter power during the relevant periods. Further, a wideband signal is transmitted during at least one of at least two consecutive symbol periods with 40% or less power of the transmitter power during the relevant period. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To implement soft handoffs without the need to duplicate data transmissions to multiple base stations.SOLUTION: Methods and apparatus which allow a wireless terminal to simultaneously maintain connections with multiple base stations are provided. Each wireless terminal 302 is capable of supporting multiple separate timing loops and/or other control loops for each base station connection thereby allowing the connections to operate independently and in parallel. Different control signals and/or data are transmitted on each connection that is established with base stations 304, 306. In this manner, the base stations 304, 306 receive different data allowing asynchronous data transmission. The data received by the base stations 304, 306 can be supplied to a wired asynchronous network without the need to combine the received data prior to supplying it to the wired network.
Abstract:
PROBLEM TO BE SOLVED: To provide pilot signal transmission sequences and methods for use in a multi-sector cell. SOLUTION: Pilots in different sectors are transmitted at different known power levels. In adjacent sectors, a pilot is transmitted while no pilot is transmitted in the adjoining sector. This represents transmission of a NULL pilot signal. A cell NULL is also supported in which NULL pilots are transmitted in each sector of a cell at the same time. Multiple pilot signal measurements are made. At least two channel quality indicator values are generated from measurements corresponding to at least two pilot signals of different power levels. The two values are transmitted back to a base station which uses both values to determine the transmit power required to achieve a desired SNR (Signal-Noise Ratio) at a wireless terminal. The wireless terminal also reports information indicating its location to a sector boundary. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To achieve transmit and/or receive diversity using multiple antennas. SOLUTION: A single transmitter chain within a wireless terminal is coupled over time to a plurality of transmit antennas 312. At any given time, a controllable switching module 310 couples the single transmitter chain to one of the plurality of transmit antennas. With the passage of time, the switching module couples the output signals from the single transmitter chain to different transmit antennas. Switching decisions are based on predetermined information, dwell information, and/or channel condition feedback information. Switching is performed on some dwell and/or channel estimation boundaries. In some OFDM embodiments, each of multiple transmitter chains is coupled, respectively, to a different transmit antenna. Information which is to be transmitted is mapped to a plurality of tones. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and apparatus for constructing different transmission segment types of segment from air link resources such as e.g., traffic channels, for effectively use the novel structure. SOLUTION: Different segment types 516 are constructed to achieve different performance characteristics. The segments 516 are aligned to deviated different starting times selected to suppress to a minimum variation in the maximum number of segments 516 starting in any of predetermined time slots 530-542. The segment starting times different from each other suppress to a minimum waste of non-used assignment messages caused by structural non-efficiency and balance traffic. Information collected for channel quality is used to classify users. Information stored for different segment types 516 having different advantages, respectively, is used for assignment processing for effectively matching the classified user to any suitable segment type. COPYRIGHT: (C)2010,JPO&INPIT