Methods and apparatuses relating to wireless communication

1 . A terminal device comprising:

means for receiving, at the terminal device from at least one base station of a telecommunications network, configuration information which is indicative of a modified configuration for a measurement validity duration pre-configured at the terminal device, wherein the measurement validity duration is for use in validating measurements of signals received from at least one cell of the telecommunications network performed by the terminal device in an idle mode or an inactive mode;

means for determining whether to follow the modified configuration for the measurement validity duration or the pre-configured measurement validity duration;

means for, responsive to determining to follow the modified configuration for the measurement validity duration, validating the measurements by applying the measurement validity duration in accordance with the modified configuration indicated by the received configuration information;

means for, responsive to determining to follow the pre-configured measurement validity duration, validating the measurements by applying the pre-configured measurement validity duration; and

means for reporting the validated measurements to the telecommunications network.

2 . The terminal device of claim 1 ,

wherein the pre-configured measurement validity duration comprises a first measurement validity duration received at the terminal device from the at least one base station of the telecommunications network,

wherein the modified configuration for the measurement validity duration indicated by the received configuration information comprises a second measurement validity duration and indicates that the second measurement validity duration overrides the first measurement validity duration, and

wherein the terminal device is configured to follow the modified configuration for the measurement validity duration by using the second measurement validity duration for validation of the measurements.

3 . The terminal device of claim 1 ,

wherein the pre-configured measurement validity duration comprises a first measurement validity duration received at the terminal device from the at least one base station of the telecommunications network, and

wherein the modified configuration for the measurement validity duration indicated by the received configuration information comprises a second measurement validity duration and indicates that the first measurement validity duration overrides the second measurement validity duration, and

wherein the terminal device is configured to follow the pre-configured measurement validity duration by using the first measurement validity duration for validation of the measurements.

4 . The terminal device of claim 3 ,

wherein the first measurement validity duration is included in a radio resource control, RRC, message received at the terminal device from the at least one base station of the telecommunications network, and/or

wherein the second measurement validity duration is included in a system information block, SIB, message received at the terminal device from the at least one base station of the telecommunications network.

5 . The terminal device of claim 1 ,

wherein the terminal device is configured to determine that the measurements are valid when they are performed by the terminal device during a time interval corresponding to the measurement validity duration which ends at a measurement reporting time.

6 . The terminal device of claim 1 ,

wherein the configuration information comprises an evaluation reference time, and

wherein the terminal device is configured to determine that the measurements are valid when they are performed by the terminal device during a time interval corresponding to the measurement validity duration which ends at the evaluation reference time.

7 . The terminal device of claim 6 , wherein the evaluation reference time corresponds to the terminal device receiving at least one of: a paging message and a User Equipment, UE, Information Request message, or to the terminal device transmitting at least one of: a Radio Resource Control, RRC, Resume Complete message, a RRC Setup Complete message and a UE Information Response message.

8 . The terminal device of claim 1 ,

wherein the configuration information comprises a flag which indicates whether the measurement validity duration should be used for validating the measurements, and

wherein the means for determining whether to follow the modified configuration for the measurement validity duration or the pre-configured measurement validity duration, are configured to perform the determination based on the flag included in the configuration information.

9 . The terminal device of claim 1 ,

wherein the configuration information indicates that the pre-configured measurement validity duration should be applied for measurements performed by the terminal device in one of the idle mode and the inactive mode and further indicates that the modified configuration for the measurement validity duration should be applied for measurements performed by the terminal device in the other of the idle mode and the inactive mode,

wherein the means for determining are configured to determine to follow the pre-configured measurement validity duration for validation of measurements performed by the terminal device in the one of the idle mode and inactive mode, and

wherein the means for determining are configured to determine to follow the modified configuration for the measurement validity duration for validation of measurements performed by the terminal device in the other of the idle mode and inactive mode.

10 . The terminal device of claim 1 ,

wherein the configuration information is received at the terminal device from the at least one base station of the telecommunications network in at least one of: a system information block, SIB, message, a radio resource control, RRC, message, and/or a medium access control, MAC, message.

11 . A method comprising:

receiving, at a terminal device from at least one base station of a telecommunications network, configuration information which is indicative of a modified configuration for a measurement validity duration pre-configured at the terminal device, wherein the measurement validity duration is for use in validating measurements of signals received from at least one cell of the telecommunications network performed by the terminal device in an idle mode or an inactive mode;

determining, by the terminal device, whether to follow the modified configuration for the measurement validity duration or the pre-configured measurement validity duration;

responsive to determining to follow the modified configuration for the measurement validity duration, the terminal device validating the measurements by applying the measurement validity duration in accordance with the modified configuration indicated by the received configuration information;

responsive to determining to follow the pre-configured measurement validity duration, the terminal device validating the measurements by applying the pre-configured measurement validity duration; and

reporting, by the terminal device, the validated measurements to the telecommunications network.