Device and method for radio cell selection
This disclosure relates to a mobile device, comprising: a receiver configured to receive a radio signal comprising transmissions from a plurality of radio cells; and a processor configured to derive second information from the received radio signal, the second information indicating at least one neighboring radio cell, wherein the processor is configured to initiate a radio cell selection based on the second information if the second information indicates at least one neighboring radio cell configured for the first RAT.
1. A mobile device, comprising:
a receiver configured to receive a radio signal comprising transmissions from a plurality of radio cells; and
a processor configured to derive second information from the received radio signal, the second information indicating at least one neighboring radio cell,
wherein the processor is configured to initiate a radio cell selection based on the second information if the second information indicates at least one neighboring radio cell configured for a first radio access technology (RAT), and to initiate the radio cell selection based on first information if the second information does not provide information about a neighboring radio cell that is configured for the first RAT.
2. The mobile device of claim 1 ,
wherein the first information is predetermined.
3. The mobile device of claim 1 ,
wherein the second information indicates at least one neighboring radio cell configured for a second RAT.
4. The mobile device of claim 3 ,
wherein the at least one neighboring radio cell configured for the first RAT is a radio cell according to a first mobile communication standard supporting the first RAT and the second RAT.
5. The mobile device of claim 3 ,
wherein the at least one neighboring radio cell configured for the second RAT is a radio cell according to a second mobile communication standard supporting the second RAT.
6. The mobile device of claim 3 ,
wherein the at least one neighboring radio cell configured for the first RAT is assigned to a first priority, wherein the at least one neighboring radio cell configured for the second RAT is assigned to a second priority, wherein the first priority is higher than the second priority.
7. The mobile device of claim 1 ,
wherein the processor is configured to derive the second information from an inter-RAT neighbor cell list comprised in system information of a broadcast channel of a respective radio cell.
8. The mobile device of claim 1 ,
wherein the processor is configured to update the first information based on the second information derived from the received radio signal if the second information indicates at least one radio cell configured for the first RAT.
9. The mobile device of claim 1 ,
wherein the second information comprises frequency information, threshold information, and priority information of the at least one neighboring radio cell.
10. The mobile device of claim 1 ,
wherein the processor is configured to initiate the radio cell selection when the mobile device is camping on a radio cell which is configured for a RAT different from the first RAT.
11. The mobile device of claim 1 ,
wherein the first information is stored in a memory section which is maintained across power cycles.
12. The mobile device of claim 1 ,
wherein the processor is configured to stop initiating the radio cell selection if the radio cell selection based on the first information is not enabled and the second information indicates no neighboring radio cell configured for the first RAT.
13. The mobile device of claim 12 ,
wherein the processor is configured to reconfigure the first information with the second information derived from the received radio signal after a predetermined time period.
14. The mobile device of claim 1 , comprising:
a layer 3 protocol stack controlling the processor to initiate the radio cell selection.
15. A method for initiating a radio cell selection, the method comprising:
receiving a radio signal comprising transmissions from a plurality of radio cells;
deriving second information from the received radio signal, the second information indicating at least one neighboring radio cell; and
initiating a radio cell selection (i) based on the second information if the second information indicates at least one radio cell configured for a first radio access technology (RAT) and, (ii) based on first information indicating at least one neighboring radio cell that is configured for the first RAT if the second information does not provide information about a neighboring radio cell that is configured for the first RAT.
16. The method of claim 15 ,
wherein the second information indicates at least one neighboring radio cell configured for a second RAT.
17. The method of claim 16 ,
wherein the at least one neighboring radio cell configured for the first RAT is a radio cell according to a first mobile communication standard supporting the first RAT and the second RAT.
18. The method of claim 16 ,
wherein the at least one neighboring radio cell configured for the second RAT is a radio cell according to a second mobile communication standard only supporting the second RAT.
19. The method of claim 16 ,
wherein the at least one neighboring radio cell configured for the first RAT is assigned to a first priority,
wherein the at least one neighboring radio cell configured for the second RAT is assigned to a second priority, and
wherein the first priority is higher than the second priority.
20. The method of claim 15 , comprising:
deriving the second information from an inter-RAT neighbor cell list comprised in system information of a broadcast channel of a respective radio cell.
21. The method of claim 15 , comprising:
updating the first information based on the second information derived from the received radio signal if the second information indicates at least one radio cell configured for the first RAT.
22. A method for connecting a mobile device to a radio cell, the method comprising:
receiving a radio signal comprising transmissions from a plurality of radio cells;
connecting the mobile device to a first radio cell based on first information indicating at least one neighboring radio cell that is configured for a first radio access technology (RAT);
deriving second information from the received radio signal, the second information indicating at least one neighboring radio cell; and
connecting the mobile device to a second radio cell (i) based on the second information if the second information indicates at least one radio cell configured for the first RAT, and (ii) based on the first information if the second information does not provide information about a neighboring radio cell that is configured for the first RAT.
23. The method of claim 22 , comprising:
disconnecting the mobile device from the first radio cell before connecting the mobile device to the second radio cell.
24. The method of claim 22 ,
wherein the first information is stored in a memory.
25. The method of claim 22 ,
wherein the second information indicates at least one neighboring radio cell configured for a second RAT.