Resolving frequency conflicts among multiple network operators
Apparatuses, systems, and methods for a wireless device avoiding reselection or handover to cells of different operators. The wireless device may attach to a first base station of a first network operator. The wireless device may determine that a neighboring base station is associated with a second network operator. Based on determining the neighboring base station is associated with the second network operator, the wireless device may exclude the third base station from handover or reselection.
1. An apparatus, comprising:
at least one processor, wherein the at least one processor is configured to cause a wireless device to:
communicate with a first cell of a first public land mobile network (PLMN);
measure a plurality of neighboring cells, including a second cell of the first PLMN and a third cell of a second PLMN, wherein the second cell of the first PLMN and the third cell of the second PLMN use a first frequency, wherein the second PLMN is not indicated as being equivalent to the first PLMN;
when in licensed spectrum, exclude cells from a reselection on the first frequency based on the third cell belonging to the second PLMN;
otherwise, exclude the third cell from the reselection based on the third cell belonging to the second PLMN; and
perform the reselection excluding at least the third cell.
2. The apparatus of claim 1 , wherein the third cell is the highest ranked cell based on said measuring.
3. The apparatus of claim 1 , wherein the at least one processor is configured to:
decode a first system information block (SIB) of the third cell; and
determine the third cell is associated with the second PLMN based on decoding the first SIB.
4. The apparatus of claim 1 , wherein the at least one processor is configured to determine the third cell is associated with the second PLMN before cell ranking of the plurality of neighboring cells.
5. The apparatus of claim 1 , wherein the at least one processor is configured to determine the third cell is associated with the second PLMN during a reselection timer.
6. The apparatus of claim 1 , wherein the at least one processor is configured to determine the third cell is associated with the second PLMN during radio resource management (RRM) measurement.
7. The apparatus of claim 1 , wherein the at least one processor is configured to determine the third cell is associated with the second PLMN during a time to trigger (TTT) timer.
8. A wireless device, comprising:
wireless communication circuitry; and
at least one processor coupled to the wireless communication circuitry, wherein the at least one processor is configured to cause the wireless device to:
communicate with a first cell of a first public land mobile network (PLMN);
measure a plurality of neighboring cells, including a second cell of the first PLMN and a third cell of a second PLMN, wherein the second cell of the first PLMN and the third cell of the second PLMN use a first frequency, wherein the second PLMN is not indicated as being equivalent to the first PLMN;
when in licensed spectrum, exclude cells from a reselection on the first frequency based on the third cell belonging to the second PLMN;
otherwise, exclude the third cell from the reselection based on the third cell belonging to the second PLMN; and
perform the reselection excluding at least the third cell.
9. The wireless device of claim 8 , wherein the third cell is the highest ranked cell based on said measuring.
10. The wireless device of claim 8 , wherein the at least one processor is configured to:
decode a first system information block (SIB) of the third cell; and
determine the third cell is associated with the second PLMN based on decoding the first SIB.
11. The wireless device of claim 8 , wherein the at least one processor is configured to determine the third cell is associated with the second PLMN before cell ranking of the plurality of neighboring cells.
12. The wireless device of claim 8 , wherein the at least one processor is configured to determine the third cell is associated with the second PLMN during a reselection timer.
13. The wireless device of claim 8 , wherein the at least one processor is configured to determine the third cell is associated with the second PLMN during radio resource management (RRM) measurement.
14. The wireless device of claim 8 , wherein the at least one processor is configured to determine the third cell is associated with the second PLMN during a time to trigger (TTT) timer.
15. A method for operating a wireless device, the method comprising:
at the wireless device:
communicating with a first cell of a first public land mobile network (PLMN);
measuring a plurality of neighboring cells, including a second cell of the first PLMN and a third cell of a second PLMN, wherein the second cell of the first PLMN and the third cell of the second PLMN use a first frequency, wherein the second PLMN is not indicated as being equivalent to the first PLMN;
when in licensed spectrum, excluding cells from a reselection on the first frequency based on the third cell belonging to the second PLMN;
otherwise, excluding the third cell from the reselection based on the third cell belonging to the second PLMN; and
performing the reselection excluding at least the third cell.
16. The method of claim 15 , wherein the third cell is the highest ranked cell based on said measuring.
17. The method of claim 15 , wherein the method comprises determining the third cell is associated with the second PLMN based on reading system information block 1 (SIB1) of the third cell.
18. The method of claim 15 , wherein the method comprises determining the third cell is associated with the second PLMN while performing measurement of the third cell.
19. The method of claim 15 , wherein the method comprises determining the third cell is associated with the second PLMN after performing measurement of the third cell.
20. The method of claim 15 , wherein the method comprises determining the third cell is associated with the second PLMN based on receiving a cell blacklist from the first PLMN, wherein the cell blacklist includes the third cell.