Abstract:
PROBLEM TO BE SOLVED: To provide a method and apparatus for tracking signals in a wireless communication system. SOLUTION: In one embodiment, a base station includes a rake antenna having a plurality of fingers. When any of the fingers is unlocked, the base station waits a predetermined time period and then adjusts a lock detecting filter 30. The adjustment is performed based on comparison of received signal energy to an adjusted energy threshold 38. The comparison may result in an increased energy level of the filter. In one embodiment, if a mobile station is in soft hand-off mode, the base station ignores the lock state of the fingers and transmits power control information based on the received signal energy. If the mobile station is not in soft hand-off mode, a predetermined power control pattern is applied for gradual power adjustment. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide closed loop and open loop power control techniques for each antenna of user equipment (UE).SOLUTION: An access point may measure signals received from each antenna of the user equipment, calculate a power adjustment parameter for each antenna of the UE, and transmit the parameters to the UE. The UE may use the adjustment parameters to determine a transmit power value for each antenna. In addition, the UE may measure a path loss for each antenna and update the transmit power per antenna on the basis of the path loss and other parameters.
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 provide techniques to support operation of user equipment (UE) in a compressed mode and a CPC mode.SOLUTION: The UE obtains assignment of enabled subframes for the CPC mode and assignment of transmission gaps for the compressed mode. The transmission gaps are aligned with idle times between the enabled subframes. The UE exchanges data during enabled subframes not overlapping the transmission gaps and skips data exchanges during enabled subframes overlapping the transmission gaps. The UE makes cell measurement during the transmission gaps. The UE obtains enabled subframes and skipped subframes, exchanges data during enabled subframes not corresponding to the skipped subframes, and skips data exchanges during the skipped subframes. The UE receives orders on a shared control channel to quickly enable and disable the compressed mode.
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 control transmit power in the presence of link imbalance on a downlink and an uplink.SOLUTION: In UL power control, UE receives a first UL TPC command and a second UL TPC command from a DL serving cell 110 and a UL serving cell 112, respectively, and adjusts its transmit power on the basis of these UL TPC commands and in accordance with an OR-of-the-UPs rule. In DL power control, the UE generates a DL TPC command on the basis of received signal quality of both the DL serving cell 110 and the UL serving cell 112. Power control is performed independently for the DL serving cell and the UL serving cell. A joint DL TPC command is generated by combining the TPC commands on the basis of received signal quality of each of the DL serving cell and the UL serving cell in accordance with the OR-of-the-UPs.
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 provide techniques for efficient cell search in a wireless communication system.SOLUTION: A frequency reuse pattern 510 is generated by applying frequency shifts to reference signals transmitted from cells that provide coverage for a Node B based on cell IDs or cell group IDs for the cells. The frequency shifts applied to the reference signals can then be utilized as a basis for multiplexing the reference signals from different cells using frequency division multiplexing (FDM) or a combination of FDM and other multiplexing techniques. Other adjustments to the reference signals transmitted from respective cells, such as transmit power adjustments, can further be made to improve detection performance.
Abstract:
PROBLEM TO BE SOLVED: To provide technology for efficient paging of user equipment (UE) in a wireless communication system.SOLUTION: A cell sends a paging indicator to UE, monitors for an acknowledgement from the UE, and sends a page message to the UE if an acknowledgement is received from the UE. The cell may receive channel quality information from the UE and may send the page message with link adaptation and/or HARQ to improve performance. In another aspect, a cell sends a paging indicator on a shared control channel to UE (612) and sends a page message on a shared data channel to the UE (614). The paging indicator and page message may be sent from multiple cells to the UE. Alternatively, the paging indicator may be sent from multiple cells to the UE, and the page message may be sent from a single cell to the UE.
Abstract:
PROBLEM TO BE SOLVED: To reduce hardware changes in legacy single-carrier systems by implementing a multi-carrier point-to-multi-point CDMA system.SOLUTION: The number of common downlink channels, such as timing/synchronization and paging channels is reduced by designating an anchor carrier for transmitting these channels. Procedures for adding carriers and carrier acquisition are simplified through common carrier timing, signaling by the network to the user equipment (UE) of timing offsets and scrambling code selection, and other measures. Channel reuse is employed to minimize changes in asymmetric systems with different numbers of uplink and downlink carriers. The Channel Quality Indicator (CQI) field is divided into multiple subfields to enable transmission of multiple CQIs and ACK/NACK indicators on one uplink carrier.