Abstract:
PROBLEM TO BE SOLVED: To provide data transmission and reception techniques to improve capacity for a wireless network and achieve power savings for a wireless device.SOLUTION: The techniques utilize a continuous packet connectivity (CPC) mode 240 comprising multiple discontinuous transmission (DTX) modes 310, 312 and one or more discontinuous reception (DRX) modes 314. The DTX modes 310, 312 are associated with different enabled uplink subframes usable for transmission from the wireless device to the network. The DRX modes 314 are associated with different enabled downlink subframes usable by the network for transmission to the wireless device. The wireless device transmits and receives signaling and/or data on the enabled subframes. The wireless device may power down during non-enabled subframes to conserve battery power. Quick transition between the DTX modes 310, 312 and the DRX modes 314 is provided.
Abstract:
PROBLEM TO BE SOLVED: To provide techniques for supporting MIMO transmission.SOLUTION: User equipment (UE) is classified into a first group of UE to be scheduled individually and a second group of UE that can be scheduled together (312). The classification is based upon the number of transmit and receive antennas, sector loading, data requirements, long-term channel statistics, and the number of pieces of UE. Channel quality indicator (CQI) information received from the UE is interpreted in different manners depending on the groups to which the UE belong. For MIMO transmission, single UE is selected at a time from the first group (314), or multiple UE is selected at a time from the second group (316). A MIMO transmission is sent to single UE in the first group or multiple UE in the second group, at rates selected based upon the CQI information (318).
Abstract:
PROBLEM TO BE SOLVED: To facilitate efficiently indicating parameter(s) associated with a base station utilizing synchronization signals in a wireless communication environment.SOLUTION: Relative locations of a PSC and an SSC in a radio frame can be a function of a parameter. A PSC sequence utilized to generate PSCs can be selected based upon a parameter. Inclusion or exclusion of PSCs from a radio frame can be a function of a parameter. Pseudo random sequence mappings (e.g., to cell IDs or tone locations) can be a function of a parameter. Parameters indicate whether the base station is part of a TDD or FDD system, whether the radio frame employs FS1 or FS2, whether the base station is associated with a macro or femto cell, or whether the base station is associated with a unicast or multicast system.
Abstract:
PROBLEM TO BE SOLVED: To reduce interference by a frequency hopping scheme in combination with the FFR scheme.SOLUTION: A frequency hopping pattern 600 is generated by dividing a portion of frequency into plurality of sub-bands 602 to 612, dividing a portion of time into plurality of sectors each having the divided sub-band, each sector comprising the divided sub-bands, designating one of the divided sub-band 614 to 624 within one of the sectors as a restricted sub-band 670, and allocating a location of the sub-band designated as the restricted sub-band.
Abstract:
PROBLEM TO BE SOLVED: To enable position identification of a mobile station even when the mobile station is located inside a building or a tunnel, or when the mobile station is not equipped with an SPS receiver, so that timing information cannot be collected from the SPS, for example.SOLUTION: A method includes: receiving transmission delay information from one or a plurality of non-serving cells in a cellular network; and determining a position of a mobile station at least partially on the basis of the transmission delay information received from the one or plurality of non-serving cells and positions of the one or plurality of non-serving cells. The method includes: transmitting a position identification pilot signal from the base station; transmitting the transmission delay information from the base station to the mobile station; and determining a position of the mobile station at least partially on the basis of the transmission delay information received from the base station, and at least partially on the basis of a known position of the base station.
Abstract:
PROBLEM TO BE SOLVED: To provide a method and an apparatus for sending control information in a communication system.SOLUTION: Control information may be sent in a first frequency location (e.g., a first set of subcarriers) if data is not being sent, and in a second frequency location (e.g., a second set of subcarriers) if data is being sent. In another aspect, control information may be processed in accordance with a first processing scheme if data is not being sent and with a second processing scheme if data is being sent. In the first scheme, a CAZAC sequence may be modulated with each modulation symbol for control information to obtain a corresponding modulated CAZAC sequence, which may be sent on the first set of subcarriers. In the second scheme, modulation symbols for control information may be combined with modulation symbols for data, transformed to frequency domain, and mapped to the second set of subcarriers.
Abstract:
PROBLEM TO BE SOLVED: To provide systems and methodologies that facilitate evaluating and utilizing timing updates in a wireless communications network.SOLUTION: A base station can transmit timing adjustment commands to mobile devices as needed as opposed to a periodic timing update where timing adjustment commands are always sent within a certain period. However, the mobile devices need to stay awake to monitor the timing adjustment message, resulting in high power consumption. On the other hand, with periodic update, the mobile devices wake up to check whether there is a timing adjustment for itself and, if not, return to a sleep mode. With the proposed method, a mobile device can sleep for a period of time to check timing adjustment commands upon waking.
Abstract:
PROBLEM TO BE SOLVED: To provide hopping structures for broadband pilot signals.SOLUTION: Systems and methodologies are described that facilitate defining and utilizing hopping patterns to transmit broadband pilot signals in a wireless communications network. Portions of bandwidth can be dedicated to transmitting the broadband pilot data, and patterns can be utilized to hop across frequencies in given time periods to effectively utilize the entire dedicated bandwidth. Moreover, the periodicity for transmitting the data is configurable to allow devices requiring additional scheduling (e.g., high activity devices) to transmit the broadband pilot data more frequently. The hopping patterns can also hop across cyclic shifts of the patterns to provide optimum diversity for transmitting broadband pilot signals.
Abstract:
PROBLEM TO BE SOLVED: To provide a system and a method that facilitate an adaptive uplink pilot multiplexing scheme.SOLUTION: A frequency position and a pilot channel bandwidth can be adaptively varied in a block over time on the basis of uplink channel data such as the number of streams to be multiplexed. Thus, the provided adaptive uplink pilot multiplexing scheme adaptively determines a flexible uplink pilot allocation scheme while maintaining a single carrier waveform for improved transmit power efficiency of pilots and orthogonality of pilots within blocks for improved channel estimation and suppression of interference.
Abstract:
PROBLEM TO BE SOLVED: To provide systems and methodologies that facilitate searches for a cell in a wireless communication environment.SOLUTION: A mobile device can employ a searcher that can detect (702) timing information respectively associated with PSCs and cells to determine the cell with the highest correlation. The searcher can detect SSCs, which can include detecting associated phase information, to determine the SSC with the highest correlation, CP length, and/or other information to facilitate identification of the desired cell having the strongest signal to establish communication between the mobile device and the desired cell. PSCs respectively associated with cells can have different positions in the symbol sequences, and SSCs can respectively be phase shifted at different angles to facilitate detection and identification of cells (704), where a PSC can be utilized as a phase reference by the associated SSC.