Abstract: Embodiments are disclosed for a new unified and flexible frame structure for 5G (5th generation) mobile telecommunications standard and related radio access technology (RAT). The disclosed embodiments use communication frames with multiple partition types and are able to span a wide range of 5G deployment scenarios in a flexible and scalable manner.

Abstract: A base station receives a report of channel state information (CSI) computation capability from a UE, configures the UE with X and Y values based on the reported computation capability, performs a beam sweep by transmitting direction-unique beams, and receives a beam measurement report from the UE comprising a reference signal receive power (RSRP) of Y strongest beams of the transmitted beams and at least a portion of the CSI of X strongest beams of the Y beams. Based on the beam measurement report, one of the X beams is selected to configure the UE for subsequent data and control channel transmissions. X and Y are positive integers, Y is greater than or equal to X, and Y is at least 1.

Abstract: A base station radio transceiver transceives beams with a UE. In a first beam set of wide beam reference signals (RS), each wide beam RS direction is unique, and in a second beam set of narrow beam RS, each narrow beam RS direction is unique and the width of the narrow beam RS is narrower than the width of the wide beam RS. A linkage uniquely links each narrow beam RS to a wide beam RS. The direction of each narrow beam RS is spatially nested within the width of the wide beam RS to which it is uniquely linked. A processor uses the first and second beam sets in a beam management process in which one of the narrow beam RS is selected for the UE and the wide beam RS uniquely linked to the selected narrow beam RS is selected for the UE according to the linkage.

Abstract: Embodiments are disclosed for a new unified and flexible frame structure for 5G (5th generation) mobile telecommunications standard and related radio access technology (RAT). The disclosed embodiments use communication frames with multiple partition types and are able to span a wide range of 5G deployment scenarios in a flexible and scalable manner.

Abstract: A processor in a UE evaluates a radio frequency beam quality metric against a threshold, switches from a first beam to a second beam in response to determining the metric falls below the threshold, and transmits to a base station (BS) a report that includes beam measurements. The report indicates the UE has performed the switching and that the beam measurements are with respect to the second beam. A processor in a UE/BS associates narrower and broader beams, uses the narrower beam, rather than the broader beam, to transfer user data between the BS and the UE, evaluates a beam quality metric of the narrower beam against the threshold, and switches to using the broader beam, rather than the narrower beam, to transfer user data between the BS and the UE in response to determining the beam quality metric of the narrower beam falls below the threshold.

Abstract: A base station (BS)/user equipment (UE) for performing radio frequency beam management and recovery in communication with a UE/BS. The BS/UE includes a processor and a memory that stores first and second thresholds. The processor evaluates a beam quality metric against the first and second thresholds, performs beam switching and/or beam broadening in response to determining the beam quality metric falls below the first threshold, and performs a beam failure recovery procedure in response to determining the beam quality metric falls below the second threshold.

Abstract: A system and method for performing multi-user random access procedures in a mobile telecommunications network between a base station and a user equipment (UE) having a plurality of antennas includes transmitting a random access signal set (RASS) message using one or more antennas of the plurality of UE antennas. In response to receiving the RASS message, the base station transmitting a random access response physical downlink control channel (RAR-PDCCH) message. In response to receiving the RAR-PDCCH message, transmitting a reciprocity reference signal set (RRSS) signal using the plurality of UE antennas.

Abstract: A base station (BS) having a plurality of antennas transmits a plurality of spatial streams. Each user equipment (UE) of a plurality of UE estimates common phase error (CPE) of each of two or more of the plurality of spatial streams, measures correlations of the estimated CPE among the two or more of the plurality of spatial streams, and provides feedback about the CPE correlations to the BS. The BS uses the CPE correlation feedback to allocate phase tracking reference signal (PTRS) ports and to map the allocated PTRS ports to demodulation reference signal (DMRS) ports corresponding to the plurality of spatial streams.

Abstract: A wireless device receives a frequency division multiplexed (FDM) symbol of constituent equalized FDM data subcarriers. A modulation scheme constellation diagram is subdivided into two or more regions. For each of the regions, a subset of the subcarriers that fall within the region are extracted and a respective region-specific CPE estimate is computed thereon. The respective region-specific CPE estimates are averaged to produce an overall CPE estimate used to compensate the subcarriers. Furthermore, a first CPE estimate is computed using pilot symbols embedded in a first received FDM symbol and is used to compensate the subcarriers. A following second FDM symbol that has no embedded pilot symbols is compensated using the first CPE estimate, and a second CPE estimate is computed using a blind estimation method on the second FDM symbol compensated subcarriers, which are compensated using the second CPE estimate.

Abstract: A wireless cellular base station includes M antennas and one or more processing devices. For each antenna, the antenna transmits a calibration pilot symbol over the air and the other M?1 antennas receive the calibration pilot symbol over the air. The processing devices select one of the M antennas as a reference antenna and for each antenna of the M antennas, the processing devices calculate channel reciprocity calibration coefficients of the antenna with respect to the reference antenna based on the received calibration pilot symbols.

Abstract: Techniques are disclosed relating to signaling and frame structure for massive MIMO communication systems. In some embodiments, an apparatus is configured to receive an uplink pilot symbol from a mobile device over a first channel and receive uplink data from the mobile device over the first channel, where the uplink data is included in one or more orthogonal frequency division multiplexing (OFDM) symbols at a symbol rate. In these embodiments, the apparatus is configured to, determine channel information based on the pilot symbol, precode downlink data based on the channel information, and transmit the precoded downlink data to the mobile device. In these embodiments, a transition interval between receiving the uplink pilot symbol and beginning to transmit the precoded downlink data corresponds to less than five OFDM symbols at the symbol rate. This may facilitate reciprocity-based precoding for fast-moving mobile devices, in some embodiments.

Abstract: A method for reducing complexity of downlink signal demodulation in a multiuser (MU) multiple-input-multiple-output (MIMO) wireless communication system includes a base station acquiring uplink (UL) channel state information (CSI) of a MIMO channel between the base station and a user equipment (UE), deriving downlink (DL) CSI from the UL CSI, and transmitting orthogonal frequency-division multiplexing (OFDM) radio subframes using MIMO pre-equalization based on the DL CSI. The UE performs downlink reciprocity correction of the OFDM subframes received from the base station using a single complex phasor estimate and performs downlink data demodulation of the downlink reciprocity corrected OFDM subframes without performing additional MIMO equalization.

Abstract: A system and method for performing multi-user random access procedures in a mobile telecommunications network between a base station and a user equipment (UE) having a plurality of antennas includes transmitting a random access signal set (RASS) message using one or more antennas of the plurality of UE antennas. In response to receiving the RASS message, the base station transmitting a random access response physical downlink control channel (RAR-PDCCH) message. In response to receiving the RAR-PDCCH message, transmitting a reciprocity reference signal set (RRSS) signal using the plurality of UE antennas.

Abstract: A wireless cellular base station includes M antennas and one or more processing devices. For each antenna, the antenna transmits a calibration pilot symbol over the air and the other M?1 antennas receive the calibration pilot symbol over the air. The processing devices select one of the M antennas as a reference antenna and for each antenna of the M antennas, the processing devices calculate channel reciprocity calibration coefficients of the antenna with respect to the reference antenna based on the received calibration pilot symbols.

Abstract: A wireless cellular base station (BS) transmitter transmits a downlink calibration pilot symbol. A receiver receives from a user equipment (UE) an uplink calibration pilot symbol and an effective downlink channel estimate transmitted by the UE. The effective downlink channel estimate is computed by the UE using the downlink calibration pilot symbol received from the BS. Processing devices compute an effective uplink channel estimate using the uplink calibration pilot symbol received from the UE and compute channel reciprocity calibration coefficients using the effective downlink channel estimate received from the UE and the effective uplink channel estimate computed by the BS. The BS includes multiple antennas, and the BS computes the channel reciprocity calibration coefficients for each antenna. Alternatively, the uplink channel estimate received by the BS is an inverted version of the effective downlink channel estimate, which the processing devices use for channel reciprocity compensation.

Abstract: Embodiments are disclosed for a new unified and flexible frame structure for 5G (5th generation) mobile telecommunications standard and related radio access technology (RAT). The disclosed embodiments use communication frames with multiple partition types and are able to span a wide range of 5G deployment scenarios in a flexible and scalable manner.

Abstract: A communication device and associated method which is configured to utilize an API constraint language for communication of resource constraints between different layers of a communication stack. A first layer of the communication stack executing in a first communication device may receive application programming interface (API) messages from a second layer of the communication stack also executing in the first communication device. In addition, the first layer may receive resource constraints with the one or more API messages. These one or more resource constraints may be generated by the second layer, or other software executing in the communication device. The first layer may then execute communication functions based on the API messages and subject to the resource constraints. The resource constraints may affect usage of hardware and/or software resources of the first communication device during execution of the communication functions.

Abstract: Techniques are disclosed relating to synchronization of radios in a large antenna count (LAC) system. In some embodiments, a LAC system includes a plurality of slave radios, a clock and trigger distribution system, and a master device. In these embodiments, the plurality of slave radios are configured to establish a fixed relationship between a reference clock and their respective local clocks. In these embodiments, the master device and plurality of slave radios are configured to generate and align respective common periodic time reference (CPTR) signals, at a lower frequency than the local clocks. In these embodiments, the master device is configured to transmit a trigger signal based on its CPTR and the plurality of slave radios are configured to perform an action based on the trigger at a subsequent edge of their CPTRs. This may allow synchronization of sampling for antennas in a massive MIMO base station, for example.

Abstract: A communication device and associated method which is configured to utilize an API constraint language for communication of resource constraints between different layers of a communication stack. A first layer of the communication stack executing in a first communication device may receive application programming interface (API) messages from a second layer of the communication stack also executing in the first communication device. In addition, the first layer may receive resource constraints with the one or more API messages. These one or more resource constraints may be generated by the second layer, or other software executing in the communication device. The first layer may then execute communication functions based on the API messages and subject to the resource constraints. The resource constraints may affect usage of hardware and/or software resources of the first communication device during execution of the communication functions.

Abstract: Techniques are disclosed relating to a massive MIMO base station architecture. In some embodiments, a base station is configured to combine signals received by multiple antennas and, for at least a subset of processing elements included in the base station, each processing element is configured to operate on a different portion of the combined signals. In these embodiments, each portion includes signals from multiple antennas. In some embodiments, the portions are different time and/or frequency portions of the combined signals. In some embodiments, this distributed processing may allow the number of antennas of the base station to scale dramatically, provide dynamic re-configurability, facilitate real-time reciprocity-based precoding, etc.