Abstract:
PROBLEM TO BE SOLVED: To transmit data using smaller data overhead in a wireless communication system. SOLUTION: Systems and methods are provided in a synchronous wireless communication system that enables data transmission without specifying information embedded in a packet between wireless mobile user equipment and base stations to reduce transmission overhead thereby. Packets are reordered in the base stations based on a pre-preparation transmitting method in which retransmission of failed packets is expected in a corresponding HARQ instance of the next group. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for performing handoff on a forward link for a terminal, in a wireless communication system including multi-carrier modulation (MCM) for a forward link and CDMA for a reverse link. SOLUTION: Signal quality of pilots received by a terminal from a plurality of base stations in a system is determined. A particular base station for subsequent data transmission on a forward link to the terminal is selected based on the signal quality determined for the plurality of base stations. A request to be handed off to the particular base station is initiated if the particular base station is different than a currently selected base station. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a technique for transmitting variable transmission in a wireless communication system. SOLUTION: Physical channels to be sent in a super-frame are identified and allocated to time slots in the super-frame. The coding and modulation for each physical channel are selected based on its capacity. The data for each physical channel is selectively encoded based on an outer code rate, e.g., for a Reed-Solomon code, and further encoded based on an inner code rate, e.g., for a Turbo code. The encoded data for each physical channel is mapped to modulation symbols based on a selected modulation scheme. The modulation symbols for each physical channel are further processed (e.g., OFDM modulated) and multiplexed onto the time slots allocated to the physical channel. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To make noise measurements within a factor of a single symbol period of a longest orthogonal code symbol. SOLUTION: A control processor 520 identifies an unoccupied code having a spreading factor that is less than a longest spreading factor for the system. A despreader 512 measures symbol energy based on the unoccupied code and a noise estimator 516 generates noise estimations based on the measured symbol energies. A subscriber station uses similar techniques in order to perform channel estimations within a period that is a fraction of a symbol period of a longest-spreading-factor code. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a frame structure and a transmission technique for a wireless communication system. SOLUTION: In a single frame structure 200, a superframe includes a plurality of outer frames, each of the outer frames includes a plurality of frames, and each of the frames includes a plurality of time slots. The time slots in each superframe are allocated to downlink and uplink and to different wireless techniques (for example, W-CDMA and OFDM) based on loading. Each physical channel is allocated to time slots in the frames of each outer frame in the superframe. An OFDM waveform is generated for an OFDM slot of each downlink, a W-CDMA waveform is generated for a W-CDMA slot of each downlink, and the waveforms are multiplexed on each slot. A modulation signal is generated for the multiplexed W-CDMA and OFDM waveform and transmitted on the downlink. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a wireless communication system with a configurable cyclic prefix length. SOLUTION: To transmit data in a manner to mitigate the deleterious effects of delay spread, the expected coverage areas for multiple transmissions to be sent in multiple time slots are initially determined. Cyclic prefix lengths for these transmissions are selected based on the expected coverage areas. The cyclic prefix length for each transmission may be selected from among a set of allowed cyclic prefix lengths on the basis of the expected coverage area for that transmission, the pilot staggering used for the transmission, and so on. For example, a shorter cyclic prefix length may be selected for each local transmission, and a longer cyclic prefix length may be selected for each wide-area transmission. The selected cyclic prefix lengths may be signaled to the terminals. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and device for reducing interference in a wireless communication system when a source of the interference is a decisive component of the system. SOLUTION: A receiver classifies the weight of a transmitter according to when the source of interference is transmitted. The transmitter can use power boosting in order to overcome the source of interference. A W-CDMA system transmits a synchronous channel to a physical channel. Here, the synchronous channel is not orthogonal to the physical channel. The receiver cancels the synchronous channel on receiving control or data information. Similarly, the receiver classifies the weight of the transmitter among a plurality thereof. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and a device for reducing interference in a wireless communication system when the source of interference is a deterministic component of the system. SOLUTION: A receiver weights the transmitters according to when the source of interference is transmitted. Further, the transmitter may employ power boosting to overcome the source of interference. A W-CDMA system transmits a sync channel concurrently with physical channels, wherein the sync channel is not orthogonal to the physical channels. The receiver may cancel the sync channel when receiving control or data information. Similarly, the receiver weights the transmissions from multiple transmitters. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
A method and apparatus for performing handoff in a wireless communication system with multi-carrier modulation (MCM) for a forward link and CDMA for a reverse link. In one embodiment, a method of performing handoff on the forward link for a terminal is provided in which signal quality of pilots received by the terminal from a plurality of base stations in the system is determined. A particular base station for subsequent data transmission on the forward link to the terminal is selected based on the signal quality determined for the plurality of base stations. A request to be handed off to the particular base station is initiated if the particular base station is different than a currently selected base station.
Abstract:
A method and apparatus for performing handoff in a wireless communication system with multi-carrier modulation (MCM) for a forward link and CDMA for a reverse link. In one embodiment, a method of performing handoff on the forward link for a terminal is provided in which signal quality of pilots received by the terminal from a plurality of base stations in the system is determined. A particular base station for subsequent data transmission on the forward link to the terminal is selected based on the signal quality determined for the plurality of base stations. A request to be handed off to the particular base station is initiated if the particular base station is different than a currently selected base station.