Dynamically combining air-interface resource reservations

1. A method for controlling air-interface resources on a radio-frequency (RF) carrier on which an access node provides wireless communication service, the method comprising:

detecting that resource-availability on the carrier is threshold low; and

responsive to at least the detecting, causing the access node to transition from (i) operating in a first mode in which the access node is set to apply on the carrier at least two resource-reservations overlapping with each other to a first extent to (ii) operating in a second mode in which the access node is instead set to apply on the carrier the at least two resource-reservations overlapping with each other to a second extent greater than the first extent,

wherein the first extent of overlap is zero overlap, and wherein the second extent of overlap is greater than zero overlap.

2. The method of claim 1 , wherein the method is implemented by the access node.

3. The method of claim 1 , wherein the method is implemented by an entity external to the access node, wherein causing the access node to transition from the first mode to the second mode comprises transmitting from the entity to the access node a directive to which the access node is configured to respond by carrying out the transition.

4. The method of claim 1 , wherein the carrier defines a plurality of physical resource blocks (PRBs), wherein the resource-availability comprises PRB-availability, and wherein the resource-reservations comprise PRB-reservations.

5. The method of claim 1 , wherein detecting that resource-availability on the carrier is threshold low comprises detecting occurrence on the carrier of at least a predefined threshold extent of resource-contention.

6. The method of claim 1 , wherein detecting that resource-availability on the carrier is threshold low comprises detecting occurrence on the carrier of at least a predefined threshold extent of loss of voice packets.

7. The method of claim 1 , wherein detecting that resource-availability on the carrier is threshold low comprises detecting at least a predefined threshold extent of resource-utilization on the carrier.

8. The method of claim 1 , wherein the method is carried out while the access node shares a portion of RF spectrum of the carrier with another access node, wherein the sharing reduces resource availability on the carrier.

9. The method of claim 1 , wherein each of the resource-reservations is for a respective different purpose than each other of the resource-reservations.

10. The method of claim 1 , wherein the second extent of overlap is complete overlap.

11. The method of claim 1 , wherein the second extent of overlap is partial overlap.

12. A method for controlling air-interface resources on a radio-frequency (RF) carrier on which an access node provides wireless communication service, the method comprising:

while the access node is set to apply at least two resource-reservations that are mutually exclusive on the carrier, detecting by a computing system that resource-availability on the carrier is threshold low; and

responsive to at least the detecting, causing by the computing system the access node to combine together the at least two resource-reservations on the carrier, wherein the combining together of the at least two resource-reservations on the carrier retains the at least two resource-reservations on the carrier while resulting in a reduction in aggregate total quantity of air-interface resources consumed by the at least two resource-reservations on the carrier,

wherein combining the at two resource-reservations on the carrier comprises reconfiguring the at least two resource-reservations from being mutually exclusive to not being mutually exclusive.

13. The method of claim 12 , wherein the combining together of the at least two resource-reservations on the carrier comprises reconfiguring the at least two resource-reservations so that they both occupy a common shared set of air-interface resources on the carrier.

14. The method of claim 12 , wherein the combining together of the at least two resource-reservations on the carrier comprises reconfiguring the at least two resource-reservations so that they partially overlap with each other.

15. A computing system configured to controlling air-interface resources on a radio-frequency (RF) carrier on which an access node provides wireless communication service, the computing system comprising:

at least one a processing unit;

at least one non-transitory data storage; and

program instructions stored in the at least one non-transitory data storage and executable by the at least one processing unit to carry out operations including:

detecting that resource-availability on the carrier is threshold low, and

responsive to at least the detecting, causing the access node to transition from (i) operating in a first mode in which the access node is set to apply on the carrier at least two resource-reservations overlapping with each other to a first extent to (ii) operating in a second mode in which the access node is instead set to apply on the carrier the at least two resource-reservations overlapping with each other to a second extent greater than the first extent,

wherein the first extent of overlap is zero overlap, and wherein the second extent of overlap is greater than zero overlap.

16. The computing system of claim 15 , wherein the second extent of overlap is partial overlap.

17. The computing system of claim 15 , wherein the second extent of overlap is full overlap.

18. The computing system of claim 15 , wherein the carrier defines a plurality of physical resource blocks (PRBs), wherein the resource-availability comprises PRB-availability, and wherein the resource-reservations comprise PRB-reservations.