The methods and apparatuses for synchronization reference source selection. Including a method performed by a user equipment (UE) in a wireless network, the said method comprises: broadcasting group information for identifying a wireless communication group including the UE; and broadcasting a special synchronization signal identification for identifying the UE as a synchronization reference source in the wireless communication group. Proposing a new synchronization mechanism for UEs to support advanced services of NR V2X.

Apparatus, methods, and computer-readable media for performing random access procedures based on two-step random access channel procedures and four-step random access channel procedures are disclosed herein. An example method for wireless communication at a User Equipment (UE) includes determining that a fallback timer associated with a two-step random access procedure is configured for the UE. The example method also includes generating a random access message based at least on the determining. The random access message may be one of a first-type random access message associated with a four-step random access procedure and including a preamble or a second-type random access message associated with the two-step random access procedure and including the preamble and a payload. Further, the example method includes performing a random access attempt by transmitting, to a base station, the random access message.

The transmission and reception group delay in a front end structure of a mobile device may be determined using closed loop calibration. The closed loop may be a near field radiated closed loop between pairs of antennas in an antenna array of the mobile device. The delay based on time of transmission and time of reception may be measured for a plurality of pairs of antennas, from which the transmit and receive group delay within a single path may be determined. The propagation delay of the signal between antennas may be included in the group delay calibration for increased accuracy. In another implementation, a conducted closed loop, e.g., in the transceiver or in a radio frequency switching network may be used to calibrate the group delay. Pre-characterization of the delay caused by components between the closed loop and antennas may be included in the group delay calibration for increased accuracy.

This disclosure relates to apparatuses, systems, and methods for channel estimation, and in particular channel estimation for 5G New Radio systems. The channel estimation interpolates, prior to performing a de-spreading operation, a first combined channel estimation and a second combined channel estimation to provide from the first combined channel estimation one or more channel estimation values at indices associated with the second combined channel estimation and/or to provide from the second combined channel estimation one or more channel estimation values at indices associated with the first combined channel estimation.

A method and apparatus that including a control panel sending an activate output command, a gateway of the control panel receiving the activate output command and determining a time period until a wireless communication subsystem becomes available, the wireless subsystem adjusting the determined time period by determining a time until a node is available to receive the output command through the gateway and wireless subsystem, the wireless subsystem sending the output command and a value of the adjusted determined time period to the node and the node activating an output device based upon the output command and adjusted determined time period.

A data portion of a physical layer (PHY) data unit is generated to include a service field that consists of eight or less bits. When it is determined that the PHY data unit is to be generated according to a first mode of operation of a long range communication protocol, the PHY data unit is generated according to a first format to include the data portion. When it is determined that the PHY data unit is to be generated according to a second mode of operation of the long range communication protocol, the PHY data unit is generated according to a second format to include the data portion, including using a slower clock rate as compared to the first format. The second mode of operation provides longer range communications as compared to the first mode of operation.

Apparatuses and methods for wireless synchronization of multiple multimedia devices using a common timing framework are disclosed. In one aspect, a wireless multimedia source device is configured to establish wireless connections with a plurality of multimedia sink devices. The wireless multimedia source device is further configured to calculate a correction time interval for each multimedia sink device based on a difference between a master program clock reference (M.sub.PCR) and a local program clock reference (L.sub.PCR) feedback signal from the multimedia sink device. Presentation time stamp (PTS) data is generated based on the correction time interval and provided to the multimedia sink device. In another aspect, a wireless multimedia sink device is configured to receive a correction time interval based on a difference between an M.sub.PCR for the multimedia source device and an L.sub.PCR for the multimedia sink device, and calculate an updated L.sub.PCR based on the correction time interval.

There is provided a technique for calibrating the envelope tracking circuitry of the wireless interface of an electronic device to compensate for any delay mismatch between the IQ signal path and the envelope path. Thee desired levels of input test signals are determined to assure that they are sensitive to any delay mismatch which may be in the system. The propagation delay from the signal generator to the signal analyzer of the envelope tracking system is estimated and delay compensation is performed. To reduce the noise of the measurement, distortion in the received signal may also be determined and noise compensation may also be performed. Based on these determinations, the envelope tracking circuitry may be calibrated by introducing an appropriate delay in either the envelop path or the IQ signal path.

Doppler pre-compensation is performed on synchronization signals using each of multiple Doppler pre-compensation patterns to generate a plurality of sets of Doppler pre-compensated synchronization signals that are transmitted using one or more beams. A signal indicating the Doppler pre-compensation patterns used is transmitted in one of a system information block (SIB) or a radio resource control (RRC) reconfiguration message, in connection with initial access by a user equipment (UE), idle UE cell reselection, connected UE data channel reception, or UE handover. The signal indicates Doppler pre-compensation patterns for a transmitting cell and Doppler pre-compensation patterns for one or more neighbor cells. The synchronization signal comprises a synchronization signal block (SSB) including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). Received Doppler pre-compensated synchronization signals are combined in the time domain in connection with timing synchronization detection, frequency offset (FO) estimation, or reference signal received power (RSRP) measurement.

A radio receiver device is arranged to store samples of incoming data symbols in an indexed memory portion having a length of A+B+C. A first data buffer 20-1 has an initial address at index 0 and a final address at index A-1. A timing adjustment buffer 22 has an initial address at index A and a final address at index A+B−1. A second data buffer 20-2 has an initial address at an index A+B and a final address at an index A+B+C−1. A buffer switch pointer 24 has a trigger address between the index 0 and the index A+B−1, at which it triggers a switch 26 from the first to the second buffer. If the current address matches the trigger address, the current address is set to the index A+B. Otherwise, the current address is incremented. If there is a timing offset between local and network clocks, the trigger address is moved to reduce the offset.