Method and apparatus for reporting relaxed measurement in a wireless communication system

1. A method performed by a wireless device in a wireless communication system, the method comprising,

receiving, from a network, a first measurement configuration including at least one of relaxed measurement conditions;

performing measurements on a serving cell based on the first measurement configuration;

evaluating the at least one of the relaxed measurement conditions based on results of the measurements on the serving cell;

performing a first relaxed measurement on the serving cell and/or at least one of neighbor cells based on the evaluation;

transmitting, to the network, a message including an information informing that the first relaxed measurement has been performed on the serving cell and/or the at least one of the neighbor cells;

receiving, from the network, a second measurement configuration for a second relaxed measurement in response to the message; and

performing the second relaxed measurement on the serving cell and/or at least one of the neighbor cells based on the second measurement configuration.

2. The method of claim 1 , wherein the message includes information informing a time length that the relaxed measurement has been performed.

3. The method of claim 1 , wherein the first relaxed measurement on the serving cell and/or the at least one of the neighbor cells is performed while in idle state and/or inactive state.

4. The method of claim 1 , wherein the message is transmitted upon entering to connected state.

5. The method of claim 1 , wherein the second relaxed measurement is performed while in connected state.

6. The method of claim 1 , wherein the performing the first relaxed measurement includes at least one of

1) performing no measurement on the serving cell and/or the at least one of the neighbor cells,

2) extending time period of measurement on the serving cell and/or the at least one of the neighbor cells, and/or

3) reducing number of cells, carriers, and/or Synchronization Signal Block (SSB) to be measured for measurement on the serving cell and/or the at least one of the neighbour cells.

7. The method of claim 1 , wherein the message includes at least one of an RRCSetupRequest message, an RRCSetupComplete message, an RRCResumeRequest message, an RRCResumeComplete message, and/or UEAssistanceInformation message.

8. The method of claim 1 , wherein the first measurement configuration includes a first relaxed measurement condition, which is that the wireless device is stationary or with low mobility.

9. The method of claim 8 , wherein the wireless device is considered as stationary or with low mobility based on measurement results of a serving cell not changing more than a first threshold value during a time period.

10. The method of claim 1 , wherein the first measurement configuration includes a second relaxed measurement condition, which is that the wireless device is not at cell edge.

11. The method of claim 10 , wherein the wireless device is considered as being not at cell edge based on measurement results of a serving cell being above a second threshold value.

12. The method of claim 1 , wherein the wireless device is in communication with at least one of a user equipment, a network, or an autonomous vehicle other than the wireless device.

13. A wireless device in a wireless communication system comprising:

a transceiver;

a memory; and

at least one processor operatively coupled to the transceiver and the memory, and configured to:

receive, from a network, a first measurement configuration including at least one of relaxed measurement conditions;

perform measurements on a serving cell based on the first measurement configuration;

evaluate the at least one of the relaxed measurement conditions based on results of the measurements on the serving cell;

perform a first relaxed measurement on the serving cell and/or at least one of neighbor cells based on the evaluation;

transmit, to the network, a message including an information informing that the first relaxed measurement has been performed on the serving cell and/or the at least one of the neighbor cells;

receive, from the network, a second measurement configuration for a second relaxed measurement in response to the message; and

perform the second relaxed measurement on the serving cell and/or at least one of the neighbor cells based on the second measurement configuration.

14. A processor for a wireless device in a wireless communication system, wherein the processor is configured to control the wireless device to perform operations comprising:

receiving, from a network, a first measurement configuration including at least one of relaxed measurement conditions;

performing measurements on a serving cell based on the first measurement configuration;

evaluating the at least one of the relaxed measurement conditions based on results of the measurements on the serving cell;

performing a first relaxed measurement on the serving cell and/or at least one of neighbor cells based on the evaluation;

transmitting, to the network, a message including an information informing that the first relaxed measurement has been performed on the serving cell and/or the at least one of the neighbor cells;

receiving, from the network, a second measurement configuration for a second relaxed measurement in response to the message; and

performing the second relaxed measurement on the serving cell and/or at least one of the neighbor cells based on the second measurement configuration.