Improving idle mode radio measurements

1. A method, comprising:

determining, by a user equipment, a first cell to connect with;

determining capabilities of the user equipment in relation to carrier aggregation comprising a carrier of the first cell;

receiving, from a network node of the first cell, a measurement indication identifying a plurality of carriers to be measured in idle mode, wherein the measurement indication comprises carriers that the user equipment can aggregate with the carrier of the first cell and carriers that the user equipment cannot aggregate with the carrier of the first cell;

autonomously determining the carriers to be measured by filtering out those carriers from the measurement indication which the user equipment cannot, based on the determined capabilities, aggregate with the carrier of the first cell;

performing idle mode radio measurements of the determined carriers to be measured; and

reporting results of the idle mode radio measurements to the network node of the first cell upon connection establishment with the first cell.

2. The method of claim 1 , further comprising: determining that the network node of the first cell supports reporting idle mode radio measurements during the connection establishment.

3. The method of claim 1 , further comprising:

causing a reception, from the network node of the first cell, of an indication indicating that a carrier aggregation is to be triggered for the user equipment, wherein the carrier aggregation comprises receiving data over the carrier of the first cell and over one or more of the carriers that were measured during the idle mode radio measurements.

4. The method of claim 1 , further comprising:

causing a reception of a measurement indication indicating to perform idle mode radio measurements; and

autonomously determining the cells to be measured based on the determined capabilities such that only those carriers that the user equipment can aggregate with the carrier of the first cell are measured.

5. The method of claim 1 , wherein those carriers that the user equipment can, based on the determined capabilities, aggregate with the carrier of the first cell are required to be associated with other cells than macro cells.

6. The method of claim 1 , wherein the reported results of the idle mode radio measurements cause triggering the carrier aggregation by the network node of the first cell, without the network node of the first cell asking for connected mode radio measurements to be performed.

7. The method of claim 1 , wherein the autonomous determining comprises utilizing information of at least one carrier aggregation configuration used by the user equipment within a past predetermined period of time.

8. The method of claim 1 , wherein the measurement indication is received in a system information block.

9. The method of claim 1 , wherein the user equipment is operating according to the long term evolution or according to the long term evolution advanced, or according to new radio, 5G.

10. An apparatus, comprising:

at least one processor and at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to:

determine a first cell to connect with;

determine capabilities of a user equipment in relation to carrier aggregation comprising a carrier of the first cell;

receive, from a network node of the first cell, a measurement indication identifying a plurality of carriers to be measured in idle mode, wherein the measurement indication comprises carriers that the user equipment can aggregate with the carrier of the first cell and carriers that the user equipment cannot aggregate with the carrier of the first cell;

autonomously determine the carriers to be measured by filtering out those carriers from the measurement indication which the user equipment cannot, based on the determined capabilities, aggregate with the carrier of the first cell;

perform idle mode radio measurements of the determined carriers to be measured; and

report results of the idle mode radio measurements to the network node of the first cell upon connection establishment with the first cell.

11. The apparatus of claim 10 , wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus further to perform:

determine that the network node of the first cell supports reporting idle mode radio measurements during the connection establishment.

12. The apparatus of claim 10 , wherein the reported results of the idle mode radio measurements cause triggering the carrier aggregation by the network node of the first cell, without the network node of the first cell asking for connected mode radio measurements to be performed.

13. The apparatus of claim 10 , wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus further to:

cause a reception, from the network node of the first cell, of an indication indicating that a carrier aggregation is to be triggered for the user equipment, wherein the carrier aggregation comprises receiving data over the carrier of the first cell and over one or more of the carriers that were measured during the idle mode radio measurements.

14. The apparatus of claim 10 , wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus further to:

receive a measurement indication indicating to perform idle mode radio measurements; and

autonomously determine the cells to be measured based on the determined capabilities such that only those carriers that the user equipment can aggregate with the carrier of the first cell are measured.

15. The apparatus of claim 10 , wherein the autonomous determination comprises utilizing information of at least one carrier aggregation configuration used by the user equipment within a past predetermined period of time.

16. The apparatus of claim 10 , wherein the measurement indication is received in a system information block.

17. The apparatus of claim 10 , wherein those carriers that the user equipment can, based on the determined capabilities, aggregate with the carrier of the first cell are required to be associated with other cells than macro cells.

18. The apparatus of claim 10 , wherein the apparatus is a user equipment and the apparatus is operating according to the long term evolution or according to the long term evolution advanced, or according to new radio, 5G.