Abstract:
PROBLEM TO BE SOLVED: To efficiently transmit a random access preamble and signaling.SOLUTION: Random access signaling may be sent based on at least one transmission parameter having different values for different user equipment (UE) classes. At least one parameter value may be determined based on a particular UE class, and the random access signaling may be sent based on the determined parameter value(s). The random access signaling may be a random access preamble, and the at least one transmission parameter may include a target SNR, a backoff time, and/or a power ramp. The random access preamble may then be sent based on a target SNR value, a power ramp value, and/or a backoff time value for the particular UE class.
Abstract:
PROBLEM TO BE SOLVED: To provide systems and methods that facilitate signaling and detecting discontinuous transmission (DTX) in a wireless communication environment.SOLUTION: A DTX indicator and channel quality indicator (CQI) feedback can be multiplexed within a common uplink control channel subframe and transmitted to a base station when an access terminal is operating in a DTX mode for an acknowledgement channel. Further, when operating in a non-DTX mode, the access terminal can multiplex an ACK indicator or a NAK indicator with the CQI feedback within a common uplink control channel subframe, which can thereafter be transferred to the base station. Accordingly, the base station can detect DTX operation or non-DTX operation of the access terminal.
Abstract:
PROBLEM TO BE SOLVED: To facilitate efficient cell acquisition in a wireless communication system.SOLUTION: A reference signal for use in cell acquisition can be constructed in a bandwidth-agnostic manner such that it contains a common central portion in a predetermined frequency band that is independent of a bandwidth utilized by an associated wireless communication system. The central portion can be constructed as a two-dimensional block in time and frequency that spans a default cell search bandwidth, a predetermined bandwidth specified by synchronization codes or other signals, or another suitable bandwidth. A reference signal can then be constructed to form the central portion by tiling or expanding the central portion such that it spans the entire system bandwidth.
Abstract:
PROBLEM TO BE SOLVED: To provide techniques for sending control information in a wireless communication system.SOLUTION: A UE spreads control information across frequency with a DFT and across time with an orthogonal sequence. The UE receives codewords for N HARQ processes in N subframes, determines an ACK value for each HARQ process, codes N ACK values for the N HARQ processes to obtain ACK information, determines output data for the ACK information, and sends the output data in one of M uplink subframes. First control information is processed based on a first coding and multiplexing scheme utilizing code division multiplexing in the time and frequency domains. Second control information is processed based on a second coding and multiplexing scheme utilizing code division multiplexing in the time domain and spreading in the frequency domain.
Abstract:
PROBLEM TO BE SOLVED: To provide techniques for transmitting traffic data and control information in a wireless communication system.SOLUTION: Traffic data and control information are multiplexed at a coded data level. User equipment (UE 120) encodes the traffic data to obtain coded traffic data, encodes the control information to obtain coded control data, multiplexes the coded traffic data and the coded control data, modulates the multiplexed data, and generates SC-FDMA symbols. In addition, the traffic data and the control information may be multiplexed at a modulation symbol level. The UE performs rate matching for the traffic data to correspond to the control information. The UE also performs multiplexing and puncturing for different types of control information.
Abstract:
PROBLEM TO BE SOLVED: To provide techniques for accessing a wireless communication system.SOLUTION: User equipment (UE) sends a random access preamble including a random identifier (ID), a channel quality indicator (CQI), etc. The UE randomly selects the random ID, or this random ID is assigned to the UE. The UE receives a random access response from a base station. The random access response includes control channel resources (CQI and PC resources), uplink resources, and control information (timing advance and PC correction) for the UE. The random access response is sent in two parts using two messages. A first message may include identification information and other information on a control channel. A second message may be sent on a shared data channel and may include remaining information for the random access response.
Abstract:
PROBLEM TO BE SOLVED: To provide a method and apparatus for efficiently paging user equipment (UE) in a wireless communication system.SOLUTION: The apparatus comprises: at least one processor configured to mask information with a paging identifier (ID) to obtain masked information, and to send the masked information to convey the information and to implicitly convey the paging indicator; and a memory coupled to the at least one processor. The at least one processor is configured to generate a cyclic redundancy check (CRC) value that is used as the information to be masked, to mask the CRC value with the paging ID to generate a masked CRC value, and to send the masked CRC value.
Abstract:
PROBLEM TO BE SOLVED: To provide systems and methodologies that facilitate increasing of throughput in a time-division duplexed CDMA wireless communication environment.SOLUTION: A set of orthogonal Walsh code sequences can be assigned to users of the first group in a network sector, and a duplicate set of orthogonal Walsh code sequences is assigned to at least users of the second group in the sector. Reception antennas whose number is equal to or greater than the number of duplicate code sets being assigned are deployed to linearly scale sector capacity to meet user demand. User devices employing duplicate Walsh code sequence assignments at a base station serving the sector is distinguished from each other, and timing offset between such users is enforced to mitigate any jamming effect at the base station receiver. Still furthermore, user device channel requirements in the sector is continuously evaluated and an appropriate number of antennas is dynamically deployed to provide scalable service to all such user devices.
Abstract:
PROBLEM TO BE SOLVED: To perform transmitting power control while efficiently estimating signal-to-noise ratios of a received signal irrespective of intentional adjustments to transmitting power due to fluctuating data rates. SOLUTION: The variation in power due to the change in data rate is decoupled from environmental sources for variations in power. The signal to noise ratio is adjusted for the data rate. The received signal power for another data rate is used as an offset for the signal to noise computation. This permits a system to efficiently and accurately control power in a power control loop for efficient use of spectral bandwidth and for improved grade of service. COPYRIGHT: (C)2011,JPO&INPIT