Abstract:
PROBLEM TO BE SOLVED: To implement sensor networks using wireless devices.SOLUTION: A wireless device obtains measurements for a first system (e.g., a broadcast system) with which the wireless device is not in communication, and sends the measurements and associated location information and/or timestamps via a second system (e.g., a cellular system). A server receives measurements from a number of wireless devices and determines the coverage of the first system on the basis of the measurements. For other applications, a wireless device obtains sensor information from at least one sensor at the wireless device, and sends the sensor information and associated location information and/or timestamps via a wireless system. A server obtains the sensor information and associated information from a number of wireless devices, aggregates the sensor information, and constructs a map.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for allowing a terminal to select a base station in a wireless communication network.SOLUTION: A virtual noise figure is an indication of a virtual noise level at a receiver, which may be higher than an actual noise level at the receiver. In an aspect, a virtual noise figure may be used for selecting a serving base station. A terminal may receive information indicative of a virtual noise figure for each of at least one base station. The terminal may select a serving base station on the basis of the virtual noise figure for each base station. The terminal may send data to the serving base station at a rate selected on the basis of an actual noise figure for the serving base station. In other aspects, a virtual noise figure may be used for interference management and/or power control.
Abstract:
PROBLEM TO BE SOLVED: To provide a method and apparatus for channel estimation in a system employing different transmission protocols such as a broadcast/multicast protocol and a unicast protocol.SOLUTION: When pilots of adjacent slots are used for channel estimation, quality of channel estimation deteriorates significantly. To solve the problem, it is determined whether a first time slot (multicast slot) of one transmission protocol is adjacent to a second time slot (unicast slot) of another transmission protocol (510); a symbol of an edge slot is determined (520); the pilot power and/or the number of pilot sub-carriers is increased (530); and channel estimation is performed using the edge symbol (540).
Abstract:
PROBLEM TO BE SOLVED: To adjust transmission power to mitigate both intra-sector interference to a serving base station and inter-sector interference to neighbor base stations.SOLUTION: The amount of inter-sector interference caused by a terminal is roughly estimated based on the total interference observed by each neighbor base station, channel gains for the serving and neighbor base stations, and the current transmission power level. The transmission power is decreased if high interference is observed by a neighbor base station and increased otherwise. The transmission power is adjusted by a larger amount and/or more frequently if the terminal is located closer to the neighbor base station observing high interference and/or if the current transmission power level is higher. The intra-sector interference is maintained within an acceptable level by limiting a received SNR for the terminal to be within a range of allowable SNRs.
Abstract:
PROBLEM TO BE SOLVED: To provide systems and methodologies that facilitate serving sector directed transmit power control in a wireless communication environment.SOLUTION: Under certain conditions, an access point can have better data with which to determine appropriate power levels than an individual terminal. Accordingly, an access point can transmit power control information to one or more terminals supported by the access point overriding normal power determination procedures. In particular, power control information can be included within an assignment message that designates resources (e.g., frequency, time) assigned to a terminal. Power control information can be based upon SNR, quality of service requirements, interference information, any other relevant information or any combination thereof.
Abstract:
PROBLEM TO BE SOLVED: To provide a rank step-down method for MIMO SCW (single code word) design employing HARQ.SOLUTION: Systems and methodologies are described that reduce rank (e.g., of a user device) as a number of transmissions therefrom increases. Such rank step-down can improve interference resistance and maintain code rate despite transmission propagation. Additionally, rank step-down information can be encoded along with CQI information to generate a 5-bit CQI signal that can update a user's rank upon each CQI transmission (e.g., approximately every 5 ms). The described systems and/or methods can be employed in a single code word (SCW) wireless communication environment with a hybrid automatic request (HARQ) protocol.
Abstract:
PROBLEM TO BE SOLVED: To provide a system, apparatus and method for supporting mobile stations that are not capable of demodulating the entire bandwidth when an arranged bandwidth is large, or that can be made to demodulate less than the entire bandwidth.SOLUTION: The method includes the processes of: transmitting a first access request using a first carrier which is one of a plurality of carriers available for communications of access terminals; receiving a first assignment for communication using the first carrier in a first access terminal; and receiving a second assignment for communication using either the first carrier or at least one second carrier, among the plurality of carriers, at the first access terminal on the basis of performances of the access terminals.
Abstract:
PROBLEM TO BE SOLVED: To provide a technology to support fast frequency hopping using a code division multiplexed pilot in a multi-carrier communication system. SOLUTION: Each transmitter transmits a wideband pilot in all sub-bands to make a receiver simultaneously estimate an entire channel response. The wideband pilot for each transmitter can be generated using direct sequence spread spectrum processing and based on a pseudo-random number code assigned to that transmitter. For a time division multiplexed TDM/CDM pilot transmission scheme, each transmitter transmits the wideband pilot in burst. For a continuous CDM pilot transmission scheme, each transmitter continuously transmits the wideband pilot while being at a low transmit power level. Any frequency hopping rate is supported without affecting a pilot overhead. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a system and method for power control in a wireless communication system. SOLUTION: A system and method for controlling transmission power are provided. The system and method vary the power of a signal provided to a power amplifier, based on the location of a frequency or frequencies of signals to be transmitted within the transmission frequency band, the location of a hop region within the transmission frequency band, the location of a frequency or frequency band of signals to be transmitted, or the combinations of these approaches. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a system and a method to facilitate efficient communication handoff for access terminals in a wireless network. SOLUTION: The method includes simultaneously decoding assignment messages from a plurality of sectors in an active set by one or more access terminals, and performing an access terminal handoff at least partially based on the active set. The access network controls the handoff processing including leveling of communication load while considering the priority of the access terminal and information such as periodic pilot report. COPYRIGHT: (C)2011,JPO&INPIT