An information transmission method and apparatus are provided. The method includes: A first communication apparatus determines feature information of a target channel and first common delay information, and determines scrambling information based on the feature information of the target channel. The first communication apparatus processes the first common delay information based on the scrambling information, to obtain second common delay information. The first communication apparatus sends the second common delay information through the target channel. A second communication apparatus receives the second common delay information through the target channel, and determines the feature information of the target channel. The second communication apparatus determines descrambling information based on information of the target channel, and further processes the second common delay information based on the descrambling information to obtain the first common delay information. In this solution, both the first communication apparatus and the second communication apparatus respectively determine corresponding scrambling information and descrambling information based on feature information of a transmission channel of common delay information, to ensure that the second communication apparatus obtains correct first common delay information.

This application discloses a frequency compensation method and apparatus, to improve performance of frequency compensation. The method includes: determining a change rate of a Doppler frequency shift value based on a weighted change rate of a change rate of a timing advance TA, determining the Doppler frequency shift value based on the change rate of the Doppler frequency shift value, and performing frequency compensation based on the determined Doppler frequency shift value; or determining a frequency offset value based on the Doppler frequency shift value with reference to pre-compensation and based on a reference signal, to further determine a frequency offset value, and performing frequency compensation based on the frequency offset value.

This application discloses a frequency compensation method and apparatus, to improve performance of frequency compensation. The method includes: determining a change rate of a Doppler frequency shift value based on a weighted change rate of a change rate of a timing advance TA, determining the Doppler frequency shift value based on the change rate of the Doppler frequency shift value, and performing frequency compensation based on the determined Doppler frequency shift value; or determining a frequency offset value based on the Doppler frequency shift value with reference to pre-compensation and based on a reference signal, to further determine a frequency offset value, and performing frequency compensation based on the frequency offset value.

Methods, systems, and devices for wireless communications are described that provide for adjustment of a frequency offset based on switching between uplink/downlink (UL/DL) transmission/reception beam pairs between a UE and a base station. A connection may be established via a first UL/DL transmission/reception beam pair and a frequency tracking loop may be established and maintained to correct for frequency error (e.g., due to Doppler shift) of received transmissions at a receiving device. In cases where a beam switch is performed, and the UE and base station switch from the first UL/DL transmission/reception beam pair to a second UL/DL transmission/reception beam pair, and a frequency offset difference between the first and second UL/DL transmission/reception beam pairs may be applied to the frequency tracking loop. The frequency offset difference may be obtained from a table of frequency offset measurements of multiple UL/DL beam pairs using associated reference signal transmissions.

Methods, systems, and devices for wireless communications are described that provide for adjustment of a frequency offset based on switching between uplink/downlink (UL/DL) transmission/reception beam pairs between a UE and a base station. A connection may be established via a first UL/DL transmission/reception beam pair and a frequency tracking loop may be established and maintained to correct for frequency error (e.g., due to Doppler shift) of received transmissions at a receiving device. In cases where a beam switch is performed, and the UE and base station switch from the first UL/DL transmission/reception beam pair to a second UL/DL transmission/reception beam pair, and a frequency offset difference between the first and second UL/DL transmission/reception beam pairs may be applied to the frequency tracking loop. The frequency offset difference may be obtained from a table of frequency offset measurements of multiple UL/DL beam pairs using associated reference signal transmissions.

Facilitating sparsity adaptive feedback in the delay doppler domain in advanced networks (e.g., 4G, 5G, 6G, and beyond) is provided herein. Operations of a method can comprise determining, by a first device comprising a processor, a channel covariance matrix in a time-frequency domain based on a channel estimation associated with reference signals received from a second device. The method also can comprise decomposing, by the first device, the channel covariance matrix into a group of component matrices. Further, the method can comprise transforming, by the first device, respective matrices of the group of component matrices into respective covariance matrices in a delay doppler domain. The method also can comprise determining, by the first device, channel state information feedback in the delay doppler domain.

Certain aspects of the present disclosure provide techniques for a synchronization signal block (SSB)-level sleep mode. A method that may be performed by a user equipment (UE) includes determining, from a synchronization signal burst set, a first set of synchronization signal blocks (SSBs) to forgo performing measurements on using one or more receive beams based, at least in part, on one or more previous measurements associated with the determined first set of SSBs and performing measurements on only one or more remaining SSBs in the synchronization signal burst set using the one or more receive beams.

Certain aspects of the present disclosure provide techniques for a synchronization signal block (SSB)-level sleep mode. A method that may be performed by a user equipment (UE) includes determining, from a synchronization signal burst set, a first set of synchronization signal blocks (SSBs) to forgo performing measurements on using one or more receive beams based, at least in part, on one or more previous measurements associated with the determined first set of SSBs and performing measurements on only one or more remaining SSBs in the synchronization signal burst set using the one or more receive beams.

Wireless communication techniques that include PTRS resource density recommendation and selection techniques are discussed. A UE may transmit to a base station a set of phase tracking reference signal (PTRS) resource density recommendations that are determined based, at least in part, on a block error rate (BLER). The base station may transmit to the UE an indication of PTRS resource densities to use for wireless communication of the PTRS based, at least in part, on the BLER associated with the received set of PTRS resource density recommendations. The base station and/or the UE may at least one of receive or transmit a PTRS based, at least in part, on the indicated PTRS resource densities. Other aspects and features are also claimed and described.

Wireless communication techniques that include PTRS resource density recommendation and selection techniques are discussed. A UE may transmit to a base station a set of phase tracking reference signal (PTRS) resource density recommendations that are determined based, at least in part, on a block error rate (BLER). The base station may transmit to the UE an indication of PTRS resource densities to use for wireless communication of the PTRS based, at least in part, on the BLER associated with the received set of PTRS resource density recommendations. The base station and/or the UE may at least one of receive or transmit a PTRS based, at least in part, on the indicated PTRS resource densities. Other aspects and features are also claimed and described.