Time difference of arrival and signal strength based timing advance validation for configured grant small data transmission

A method performed by a network node for validating a timing advance, the method comprising:

• determining a time-difference threshold for a wireless device;
• and
• determining a signal strength-difference (SS-difference) threshold for the wireless device;
• and
• transmitting the time-difference threshold and the SS-difference threshold to the wireless device, wherein
• to determine whether the timing advance is valid, the time-difference threshold is compared with a time difference of arrival (TDOA) magnitude of difference between a first measurement of a time of arrival for a first beam and a second measurement of a time of arrival for a second beam, and the SS-difference threshold is compared with a signal strength (SS) magnitude of difference between a third measurement of a signal strength for the first beam and a fourth measurement of a signal strength for the second beam.

A wireless device for validating a timing advance, the wireless device comprising:

• processing circuitry configured to:
• perform a first measurement of a time of arrival for a first beam, the first measurement being within a first duration of time,
• perform a second measurement of a time of arrival for a second beam, the second measurement being within a second duration of time,
• calculate a time difference of arrival (TDOA) magnitude of difference between the first measurement of the time of arrival for the first beam and the second measurement of the time of arrival for the second beam,
• compare the TDOA magnitude of difference with a time-difference threshold,
• perform a third measurement of a signal strength for the first beam, the third measurement being within a third duration of time;
• perform a fourth measurement of a signal strength for the second beam, the fourth measurement being within a fourth duration of time;
• calculate a magnitude of a signal strength (SS) difference between the third measurement of the signal strength for the first beam and the fourth measurement of the signal strength for the second beam;
• compare the TDOA magnitude of difference with a time-difference threshold and comparing the SS magnitude of difference with a SS-difference threshold;
• and
• determine whether the timing advance is valid based on results of the comparing the TDOA magnitude of difference with the time-difference threshold and comparing the SS magnitude of difference with the SS-difference threshold;
• and
• power supply circuitry configured to supply power to the wireless device.

A network node for validating a timing advance, the network node comprising:

• processing circuitry configured to:
• determine a time-difference threshold for a wireless device;
• determine a signal strength-difference (SS-difference) threshold for the wireless device;
• and
• transmit the time-difference threshold and the SS-difference threshold to the wireless device, wherein
• to determine whether the timing advance is valid, the time-difference threshold is compared with a time difference of arrival (TDOA) magnitude of difference between a first measurement of a time of arrival for a first beam and a second measurement of a time of arrival for a second beam, and the SS-difference threshold is compared with a signal strength (SS) magnitude of difference between a third measurement of a signal strength for the first beam and a fourth measurement of a signal strength for the second beam;
• and
• power supply circuitry configured to supply power to the wireless device.