Uplink-aware serving cell selection
An example method comprises receiving an event notification from a cell in a current set of a user equipment, the event notification indicating an uplink signal strength from the user equipment to the cell relative to a threshold; and designating the cell as being either a viable candidate or not a viable candidate to be a serving cell based on the uplink signal strength relative to the threshold.
1. A method, comprising:
receiving an event notification from a cell in a current set of a user equipment, the event notification indicating an uplink signal quality from the user equipment to the cell; and
designating the cell as being a viable candidate to be a serving cell based on the event notification, wherein the cell is designated as not being a viable candidate based on the event notification indicating that the uplink signal quality is below a lower threshold for a first predetermined amount of time, the first predetermined amount of time set to avoid or reduce hysteresis, and wherein the cell is designated as being a viable candidate to be a serving cell based on the event notification indicating that the uplink signal quality is above an upper threshold for a second predetermined amount of time, the second predetermined amount of time set to avoid or reduce hysteresis,
wherein the upper threshold is set sufficiently high, the lower threshold is set sufficiently low, and the upper and lower thresholds are sufficiently separated to avoid or reduce hysteresis.
2. The method of claim 1 , further comprising:
initiating a serving cell change operation when the cell is a current serving cell and the cell is designated as not being a viable candidate to be the serving cell.
3. The method of claim 1 , further comprising:
initiating a serving cell change operation to make the cell a serving cell based on the cell being designated a viable candidate to be the serving cell.
4. The method of claim 1 , wherein the event notification is received by a radio network controller.
5. The method of claim 1 , wherein the cell is a cellular node of a core network.
6. The method of claim 1 , wherein the cell is a node of a small cell network.
7. The method of claim 1 , wherein uplink signal quality includes signal-to-interference ratio.
8. The method of claim 1 , wherein the upper threshold and the lower threshold are dynamically determined in accordance with an algorithm or variable parameters.
9. The method of claim 1 , further comprising determining if the cell is a current serving cell when the event notification indicates that the uplink signal quality is below the lower threshold for the first predetermined amount of time.
10. The method of claim 9 , further comprising:
if the cell is not the current serving cell,
setting a status of the cell indicative of having insufficient uplink signal quality; and
not initiating a change in the current serving cell.
11. The method of claim 9 , further comprising initiating a change in the current serving cell to another cell in a group of active cells for the user equipment if the cell is the current serving cell.
12. The method of claim 1 , further comprising determining if the cell has a dominant downlink signal among a group of active cells for the user equipment when the event notification indicates that the uplink signal quality is above the upper threshold for the second predetermined amount of time.
13. The method of claim 12 , further comprising:
if the cell does not have the dominant downlink signal among the group of active cells for the user equipment,
setting a status of the cell indicative of having sufficient uplink signal quality; and
not initiating a change in a current serving cell.
14. The method of claim 12 , further comprising initiating a change in a current serving cell to the cell if the cell does have the dominant downlink signal among the group of active cells for the user equipment.
15. An apparatus, comprising:
a processor; and
a memory including computer program code, the memory and the computer program code configured to, with the processor, cause the apparatus to perform at least the following:
receiving an event notification from a cell in a current set of a user equipment, the event notification indicating an uplink signal quality from the user equipment to the cell; and
designating the cell as being a viable candidate to be a serving cell based on the event notification, wherein the cell is designated as not being a viable candidate based on the event notification indicating that the uplink signal quality is below a lower threshold for a first predetermined amount of time, the first predetermined amount of time set to avoid or reduce hysteresis, and wherein the cell is designated as being a viable candidate to be a serving cell based on the event notification indicating that the uplink signal quality is above an upper threshold for a second predetermined amount of time, the second predetermined amount of time set to avoid or reduce hysteresis,
wherein the upper threshold is set sufficiently high, the lower threshold is set sufficiently low, and the upper and lower thresholds are sufficiently separated to avoid or reduce hysteresis.
16. The apparatus of claim 15 , wherein the memory and the computer program code are further configured to, with the processor, cause the apparatus to perform at least the following:
initiating a serving cell change operation when the cell is a current serving cell and the cell is designated as not being a viable candidate to be the serving cell.
17. The apparatus of claim 15 , wherein the memory and the computer program code are further configured to, with the processor, cause the apparatus to perform at least the following:
initiating a serving cell change operation to make the cell a serving cell based on the cell being designated a viable candidate to be the serving cell.
18. A computer program product, embodied on a non-transitory computer-readable medium, comprising:
computer code for receiving an event notification from a cell in a current set of a user equipment, the event notification indicating an uplink signal quality from the user equipment to the cell; and
computer code for designating the cell as being a viable candidate to be a serving cell based on the event notification, wherein the cell is designated as not being a viable candidate based on the event notification indicating that the uplink signal quality is below a lower threshold for a first predetermined amount of time, the first predetermined amount of time set to avoid or reduce hysteresis, and wherein the cell is designated as being a viable candidate to be a serving cell based on the event notification indicating that the uplink signal quality is above an upper threshold for a second predetermined amount of time, the second predetermined amount of time set to avoid or reduce hysteresis,
wherein the upper threshold is set sufficiently high, the lower threshold is set sufficiently low, and the upper and lower thresholds are sufficiently separated to avoid or reduce hysteresis.
19. The computer program product of claim 18 , further comprising:
computer code for initiating a serving cell change operation when the cell is a current serving cell and the cell is designated as not being a viable candidate to be the serving cell.
20. The computer program product of claim 18 , further comprising:
computer code for initiating a serving cell change operation to make the cell a serving cell based on the cell being designated a viable candidate to be the serving cell.