Abstract:
Methods, systems, and devices are provided for discontinuous transmission (DTX) in systems that utilize one or more flexible bandwidth carriers. Tools and techniques are provided that may help ensure signaling alignment, such as with respect to DTX cycles, in systems that may utilize one or more flexible bandwidth carriers. Such methods may include identifying at least a DTX cycle for a first cell or a DTX cycle for a second cell, wherein at least the first cell or the second cell utilizes at least one of the one or more flexible bandwidth carriers; and adjusting one or more DTX parameters for at least the first cell or the second cell to align the DTX cycle for the second cell with the DTX cycle for the first cell such that the DTX cycle for the second cell at least partially overlaps the DTX cycle for the first cell.
Abstract:
A wireless device may determine the level of interference mitigation appropriate for the application and dynamically select a combination of interference cancellation components that satisfies that level. The combination of interference cancellation components may include components that consume power (e.g., active components) and components that do not consume power (e.g., passive components). The interference cancellation components may be used at the transmitter and/or the receiver. In some cases, the wireless device may also determine how much power is acceptable to expend on the interference mitigation. In such scenarios, the selection of the interference cancellation components may be such that the aggregated power consumption is less than the power expenditure limit.
Abstract:
Low-power transmitter and/or receiver devices are provided by sacrificing time and/or frequency diversity in exchange for lower power consumption. When channel conditions indicate that time and/or frequency spreading are unnecessary for transmissions, a transmitter may enter into a power-conservation mode in which transmissions are performed using a time gating scheme or a time repetition scheme. In the time gating scheme, symbols are transmitting just once, rather than a plurality of times, but with increased transmission power. In the time repetition scheme, copies of the same symbol are transmitted a plurality of times on the same frequency on different symbol transmission periods, instead of being retransmitted on different frequencies on different symbol transmission periods. Consequently, the symbol can be generated once and stored for subsequent retransmission, thereby allowing some of the transmitter/receiver chain components can be operated at a lower duty cycle or processing speed to conserve power.
Abstract:
A multiple input and multiple output device includes a first input switch, a second input switch, a first set of analog interference cancellation (AIC) circuits, and a second set of AIC circuits. The first input switch is configured to select one of a first transmit input of first transmit inputs or a first transmit input of second transmit inputs. The second input switch is configured to select one of a second transmit input of the first transmit inputs or a second transmit input of the second transmit inputs. The first set of AIC circuits and the second set of AIC circuits are coupled to the first input switch and to the second input switch. The first set of AIC circuits is configured to output a first cancellation signal. The second set of AIC circuits is configured to output a second cancellation signal.
Abstract:
Methods, systems, and devices are described for control information processing and utilization in a wireless communications system that utilizes one or more flexible bandwidth carriers. The methods may include receiving control information over a first channel of one of the one or more flexible bandwidth carriers, determining a processing time for the received control information over the first channel of the one of the one or more flexible bandwidth carriers based on a processing time of control information for another bandwidth carrier, and utilizing the received control information over the first channel of the one of the one or more flexible bandwidth carriers during a first transmission time interval of the first channel of the one of the one or more flexible bandwidth carriers subsequent to the processing time for the received control information over the first channel of the one of the one or more flexible bandwidth carriers.
Abstract:
Methods, systems, and devices are provided for system information management in a wireless communications. A user equipment (UE) may identify a first value of a value tag in a first carrier, read a system information block (SIB) on the first carrier associated with the value tag, and identify a second value of the value tag in a second carrier. The UE may compare the first value with the second value and determine whether the read SIB on the first carrier may be utilized on the second carrier. Other techniques may include identifying a first value of a value tag for a first carrier linked with a SIB transmitted over the first carrier. The techniques may include determining a second value of the value tag for a second carrier indicating whether the SIB transmitted over the first carrier may be utilized on the second carrier.
Abstract:
An apparatus for wireless communication obtains a first metric of a cell based on signals received by a WWAN radio tuned to a common frequency, and a second metric of the cell based on signals received by a WLAN radio tuned to the common frequency. The apparatus determines a calibration factor based on the first and second metrics, and performs cell search and cell measurement based on the calibration factor and signals received by the WLAN radio tuned to a target frequency. The common frequency may be a serving frequency of the WWAN, in which case the first and second metrics are one of frequency or power metrics and the calibration factor is one of a frequency offset and a power offset. The common frequency may also be a target frequency for inter-frequency measurements of the WWAN, in which case the calibration factor is based primarily on power measurements.
Abstract:
Methods, systems, and devices are described for control information processing and utilization in a wireless communications system that utilizes one or more flexible bandwidth carriers. The methods may include receiving control information over a first channel of one of the one or more flexible bandwidth carriers, determining a processing time for the received control information over the first channel of the one of the one or more flexible bandwidth carriers based on a processing time of control information for another bandwidth carrier, and utilizing the received control information over the first channel of the one of the one or more flexible bandwidth carriers during a first transmission time interval of the first channel of the one of the one or more flexible bandwidth carriers subsequent to the processing time for the received control information over the first channel of the one of the one or more flexible bandwidth carriers.
Abstract:
An orthogonal frequency division multiplex (OFDM) transmitter may adaptively load each sub-carrier, buffering less than an OFDM frame in order to reduce hardware requirements and latency. The transmitter may use feedback information from the receiver regarding the quality of the sub-carriers. In addition, combining repetition and puncturing to achieve a desired date rate per class further reduces hardware by simplifying or even eliminating an interleaver. Additional mitigation and even performance enhancement techniques are incorporated to address inter-class boundaries within an OFDM frame, such as introducing transition classes. Channel state information may be reported in various formats including full bitmap, changed subchannels, and reported bad subchannels.
Abstract:
An orthogonal frequency division multiplex (OFDM) transmitter may adaptively load each sub-carrier, buffering less than an OFDM frame in order to reduce hardware requirements and latency. The transmitter may use feedback information from the receiver regarding the quality of the sub-carriers. In addition, combining repetition and puncturing to achieve a desired date rate per class further reduces hardware by simplifying or even eliminating an interleaver. Additional mitigation and even performance enhancement techniques are incorporated to address inter-class boundaries within an OFDM frame, such as introducing transition classes. Channel state information may be reported in various formats including full bitmap, changed subchannels, and reported bad subchannels.