Method of handling cell selection and related communication device
A method of handling a cell selection for a communication device comprises performing the cell selection in a first one of a normal mode and a coverage enhancement mode, to select a cell; and camping on the cell in a second one of the normal mode and the coverage enhancement mode.
1. A method of handling a cell selection for a communication device, the method comprising:
performing the cell selection in a first one of a normal mode and a coverage enhancement mode, to select a cell; and
camping on the cell in a second one of the normal mode and the coverage enhancement mode;
wherein at least one first parameter, one first criterion and/or at least one dedicated resource of the coverage enhancement mode for performing the cell selection are different from at least one second parameter, one second criterion and/or at least one resource of the normal mode for performing the cell selection;
wherein the communication device performs the cell selection in the coverage enhancement mode, if the first mode is the normal mode and the communication device fails to complete the cell selection.
2. The method of claim 1 , wherein the normal mode is a legacy mode defined in the 3rd Generation Partnership Project (3GPP) standard.
3. The method of claim 1 , wherein the at least one dedicated resource is identified by a carrier frequency of the at least one dedicated resource, a bandwidth of the at least one dedicated resource, a cell-ID of the at least one dedicated resource and/or a location of the at least one dedicated resource.
4. The method of claim 1 , further comprising the step of:
determining the first one of the normal mode and the coverage enhancement mode according to a cell-selection criterion before performing the cell selection.
5. The method of claim 4 , wherein the cell-selection criterion comprises a comparison of a received signal quality of the communication device with a threshold.
6. The method of claim 5 , wherein the communication device determines that the first one of the normal mode and the coverage enhancement mode is the normal mode if the received signal quality is greater than the threshold, and determines that the first one of the normal mode and the coverage enhancement mode is the coverage enhancement mode if the received signal quality is not greater than the threshold.
7. The method of claim 1 , wherein the first one of the normal mode and the coverage enhancement mode is predetermined for performing the cell selection.
8. The method of claim 1 , wherein the first one of the normal mode and the coverage enhancement mode and the second one of the normal mode and the coverage enhancement mode are the same mode.
9. The method of claim 1 , wherein the first one of the normal mode and the coverage enhancement mode and the second one of the normal mode and the coverage enhancement mode are the coverage enhancement mode.
10. The method of claim 1 , wherein the communication device performs the cell selection in the coverage enhancement mode, if the first one of the normal mode and the coverage enhancement mode is the normal mode and a number of failed cell selections is greater than a first threshold and/or a time spent on the cell selection is greater than a second threshold.
11. The method of claim 1 , further comprising the step of:
determining the second one of the normal mode and the coverage enhancement mode according to a camp criterion before camping on the cell.
12. The method of claim 11 , wherein the camp criterion comprises a comparison of a signal quality of the communication device with at least one threshold.
13. The method of claim 12 , wherein the communication device determines that the second one of the normal mode and the coverage enhancement mode is the normal mode, if the signal quality is greater than the threshold and the first one of the normal mode and the coverage enhancement mode is the coverage enhancement mode.
14. The method of claim 1 , wherein the at least one first parameter, the first criterion and/or the at least one dedicated resource correspond to a selection criterion S of the coverage enhancement mode, and the at least one second parameter, the second criterion and/or the at least one resource correspond to a selection criterion S of the normal mode.
15. The method of claim 7 , wherein the first mode is the normal mode.
16. A communication device for handling a cell selection, comprising:
a storage unit, for storing instructions of:
performing the cell selection in a first one of a normal mode and a coverage enhancement mode, to select a cell; and
camping on the cell in a second one of the normal mode and the coverage enhancement mode;
wherein at least one first parameter, one first criterion and/or at least one dedicated resource of the coverage enhancement mode for performing the cell selection are different from at least one second parameter, one second criterion and/or at least one resource of the normal mode for performing the cell selection;
wherein the communication device performs the cell selection in the coverage enhancement mode, if the first mode is the normal mode and the communication device fails to complete the cell selection; and
a processing means, coupled to the storage unit, configured to execute the instructions stored in the storage unit.
17. The communication device of claim 16 , wherein the normal mode is a legacy mode defined in the 3rd Generation Partnership Project (3GPP) standard.
18. The communication device of claim 16 , wherein the at least one dedicated resource is identified by a carrier frequency of the at least one dedicated resource, a bandwidth of the at least one dedicated resource, a cell-ID of the at least one dedicated resource and/or a location of the at least one dedicated resource.
19. The communication device of claim 16 , further comprising the instruction of:
determining the first one of the normal mode and the coverage enhancement mode according to a cell-selection criterion before performing the cell selection.
20. The communication device of claim 19 , wherein the cell-selection criterion comprises a comparison of a received signal quality of the communication device with a threshold.
21. The communication device of claim 20 , wherein the communication device determines that the first one of the normal mode and the coverage enhancement mode is the normal mode if the received signal quality is greater than the threshold, and determines that the first one of the normal mode and the coverage enhancement mode is the coverage enhancement mode if the received signal quality is not greater than the threshold.
22. The communication device of claim 16 , wherein the first one of the normal mode and the coverage enhancement mode is predetermined for performing the cell selection.
23. The communication device of claim 16 , wherein the first one of the normal mode and the coverage enhancement mode and the second one of the normal mode and the coverage enhancement mode are the same mode.
24. The communication device of claim 16 , wherein the first one of the normal mode and the coverage enhancement mode and the second one of the normal mode and the coverage enhancement mode are the coverage enhancement mode.
25. The communication device of claim 16 , wherein the communication device performs the cell selection in the coverage enhancement mode, if the first one of the normal mode and the coverage enhancement mode is the normal mode and a number of failed cell selections is greater than a first threshold and/or a time spent on the cell selection is greater than a second threshold.
26. The communication device of claim 16 , further comprising the instruction of:
determining the second one of the normal mode and the coverage enhancement mode according to a camp criterion before camping on the cell.
27. The communication device of claim 26 , wherein the camp criterion comprises a comparison of a signal quality of the communication device with at least one threshold.
28. The communication device of claim 27 , wherein the communication device determines that the second one of the normal mode and the coverage enhancement mode is the normal mode, if the signal quality is greater than the threshold and the first one of the normal mode and the coverage enhancement mode is the coverage enhancement mode.
29. The communication device of claim 16 , wherein the at least one first parameter, the first criterion and/or the at least one dedicated resource correspond to a selection criterion S of the coverage enhancement mode, and the at least one second parameter, the second criterion and/or the at least one resource correspond to a selection criterion S of the normal mode.
30. The communication device of claim 22 , wherein the first mode is the normal mode.