Abstract:
Shared spectrum operation is disclosed for sharing spectrum among multiple wireless deployments. Coordination procedures between and among 2nd and 3rd Tier deployments include the use of beacons transmitted by the 2nd Tier for clearing access to spectrum occupied by 3rd Tier users and multiple 3rd Tier deployments sharing resources using a group-listen before talk (LBT) protocol, rather than a per-node LBT protocol. The 2nd Tier beacon signals are transmitted to alert 3rd Tier users of their presence, which, upon detection, will leave the particular spectrum within a predetermined time. For the shared LBT protocol, the 3rd Tier deployments share the channel with each other through an LBT with random backoff, in which the start time of clear channel assessment (CCA) procedure and the random backoff values are synchronized among nodes of the same deployment.
Abstract:
Aspects of the disclosure relate to a configurable subframe structure for use in next generation (e.g., fifth generation or 5G) wireless networks utilizing a time division duplex (TDD) carrier that minimizes interference with adjacent legacy wireless networks. The configurable subframe structure may be configured to produce next generation subframes, each including at least one of a downlink portion or an uplink portion, to substantially align downlink portions with corresponding legacy downlink subframes and/or uplink portions with corresponding legacy uplink subframes.
Abstract:
Some aspects of the disclosure provide for a flexible and reconfigurable subframe structure that allows various devices with different capabilities and frequency agility to efficiently utilize the available channel bandwidth (BW) and/or save power. In some aspects of the disclosure, the reference signal and/or control channel placement in the subframe can facilitate faster processing and increased sleep mode duration of the devices.
Abstract:
Methods, systems, and devices for wireless communication are described. One method includes identifying a plurality of intermediate precoders corresponding to a plurality of tone subsets. The plurality of intermediate precoders define a plurality of vectors across the plurality of tone subsets. The method further includes selecting, for each vector of the plurality of vectors, a subset of non-frequency domain components of the vector, such as time-domain components; modifying the plurality of intermediate precoders to a plurality of smoothed precoders based at least in part on the selected subset of non-frequency domain components for each vector; and precoding a plurality of transmit streams using the plurality of smoothed precoders. The plurality of smoothed precoders is smoothed in a frequency domain compared to the plurality of intermediate precoders. Smoothing precoders may enable application of wideband channel estimation techniques using user equipment (UE)-specific reference signals.
Abstract:
Systems, methods, apparatuses, and computer-program products for performing dynamic bandwidth switching between control signals and data signals of differing bandwidths are disclosed. Frame formats are disclosed in which control signals are transmitted at different bandwidths than data signals. Receiver architectures for receiving the signaling formats are disclosed. A receiver can receive a relatively narrowband control signal while consuming a relatively low power and then dynamically adjust characteristics of various components to receive a data signal at a higher bandwidth while consuming a relatively higher power.
Abstract:
Systems, methods, apparatuses, and computer-program products for performing dynamic bandwidth switching between control signals and data signals of differing bandwidths are disclosed. Frame formats are disclosed in which control signals are transmitted at different bandwidths than data signals. Receiver architectures for receiving the signaling formats are disclosed. A receiver can receive a relatively narrowband control signal while consuming a relatively low power and then dynamically adjust characteristics of various components to receive a data signal at a higher bandwidth while consuming a relatively higher power.
Abstract:
Aspects of the present disclosure provide a time division duplex (TDD) subframe structure that supports both single and multiple interlace modes of operation. In a single interlace mode, control information, data information corresponding to the control information and acknowledgement information corresponding to the data information are included in a single subframe. In a multiple interlace mode, at least one of the control information, the data information corresponding to the control information or the acknowledgement information corresponding to the data information is included in a different subframe. Both single and multiple interlace modes can be multiplexed together within the TDD subframe structure.
Abstract:
Techniques are described for wireless communication. A first method includes wirelessly communicating at a first device, with a second device, according to a first subframe structure; receiving a subframe truncation parameter from the second device; and terminating the first subframe structure based at least in part on the subframe truncation parameter. The first subframe structure includes a first periodic sequence of downlink transmission time intervals (TTIs) and uplink TTIs. A second method includes wirelessly communicating at a first device, with a second device, according to a parameterized self-contained subframe structure having an interlaced portion and a tail portion; and reducing a delay indicated by a nominal trigger-response delay parameter associated with a downlink TTI, to enable a response message corresponding to the downlink TTI to be transmitted during the tail portion and before termination of the subframe structure.
Abstract:
A system and method for low latency acknowledgements includes a communication unit that includes a processor, a transmitter coupled to the processor, and a receiver coupled to the processor. The communication unit is configured to transmit a message to another communication unit, receive a first group of one or more repetitions of an acknowledgement signal from the another communication unit, and decode the acknowledgement signal prior to fully receiving a last repetition of a second group of one or more repetitions of the acknowledgement signal. The acknowledgement signal has a partially decodable structure. In some embodiments, each of the are repetitions of a same time domain waveform received during one symbol period. In some embodiments, a frequency domain characteristic of the time domain waveform consists of one non-zero tone for every K tones, K being equal to a sum of a number of repetition in the first and second groups.
Abstract:
Systems and techniques are disclosed to enhance the efficiency of available bandwidth between UEs and base stations. A UE transmits a sounding reference signal to the base station, which characterizes the uplink channel based on the SRS received and, using reciprocity, applies the channel characterization for the downlink channel. The base station may form the beam to the UE based on the uplink channel information obtained from the SRS. As the downlink channel changes the base station needs updated information to maintain its beamforming, meaning it needs a new SRS. Transmission of the SRS takes resources; to minimize this, the UE or the base station can determine a period during which the downlink channel will predictably remain coherent and set up a schedule for sending SRS. Alternatively, the UE or the base station can determine on demand that the channel is losing coherence and initiate an on demand SRS.