Controlling secondary-node addition based on cooperative consideration of coverage comparison and predicted data split

1. A method for controlling configuration of dual connectivity for a user equipment device (UE), wherein the dual connectivity includes the UE being served cooperatively by (i) a first access node over a first air-interface connection between the UE and the first access node and (ii) a second access node over a second air-interface connection between the UE and the second access node, the method comprising:

making a prediction of whether both (i) in the dual connectivity, a data split will put a threshold greater portion of data flow of the UE on the second air-interface connection than on the first air-interface connection and (ii) coverage strength of the UE from the second access node will be threshold lower than coverage strength of the UE from the first access node; and

using the prediction as a basis to control whether or not to establish the dual connectivity for the UE.

2. The method of claim 1 , wherein controlling whether or not to establish the dual connectivity for the UE comprises:

if the prediction is affirmative, then, based at least on the prediction, causing the dual connectivity to not be established for the UE; and

if the prediction is negative, then, based at least on the prediction, allowing the dual connectivity to be established for the UE.

3. The method of claim 2 , wherein causing the dual connectivity to not be established for the UE comprises preventing establishment of dual connectivity for the UE.

4. The method of claim 2 , wherein causing the dual connectivity to not be established for the UE comprises preventing establishment of the dual connectivity including the second air-interface connection between the UE and the second access node.

5. The method of claim 4 , wherein, in the dual connectivity, the second air-interface connection would be on a set of one or more cells, and wherein causing the dual connectivity to not be established for the UE comprises preventing establishment of the dual connectivity with the second air-interface being on the set of one or more cells but allowing establishment for the UE of alternate dual connectivity with the second air-interface connection being on a different set of one or more cells.

6. The method of claim 1 , further comprising, to facilitate making the prediction, predicting whether the data split will put the threshold greater portion of data flow of the UE on the second air-interface connection than on the first air-interface connection, including:

predicting the data split based at least on a comparison between (i) available data capacity of the first air-interface connection and (ii) availability data capacity of the second air-interface connection; and

determining whether the predicted data split will put the threshold greater portion of data flow of the UE on the second air-interface connection than on the first air-interface connection.

7. The method of claim 6 , wherein the threshold greater portion defines a majority of the data flow of the UE.

8. The method of claim 6 , wherein the data split is as to at least one of a downlink of the UE and an uplink of the UE.

9. The method of claim 1 , further comprising, to facilitate making the prediction, predicting whether coverage strength of the UE from the second access node will be threshold lower than coverage strength of the UE from the first access node, including:

determining, based at least on first measurement reporting from the UE, coverage strength of the UE from the second access node;

determining, based at least on second measurement reporting from the UE, coverage strength of the UE from the first access node;

comparing the determined coverage strength of the UE from the second access node with the determined coverage strength of the UE from the first access node; and

based at least on the comparing, determining whether the determined coverage strength of the UE from the second access node is at least as much as a predefined threshold lower than the determined coverage strength of the UE from the first access node.

10. The method of claim 9 , wherein each coverage strength comprises reference signal receive power.

11. The method of claim 9 , wherein each coverage strength is measured on a primary cell.

12. The method of claim 1 , wherein the first air-interface connection is a 4G Long Term Evolution (4G LTE) connection, the second air-interface connection is a 5G New Radio (5G NR) connection, and the dual connectivity is EUTRA-NR Dual Connectivity (EN-DC).

13. The method of claim 1 , further comprising carrying out the method when the UE already has the first air-interface connection, wherein at issue is whether to establish for the UE the second air-interface connection.

14. The method of claim 1 , wherein the method is carried out by the first access node.

15. A computing system configured to control configuration of dual connectivity for a user equipment device (UE) when the UE has a first air-interface connection between the UE and a first access node, wherein establishing the dual connectivity includes adding for the UE a second air-interface connection between the UE and a second access node to enable the UE to be served concurrently by the first access node over the first air-interface connection and the second access node over the second air-interface connection, the computing system comprising:

a processor;

non-transitory data storage; and

program instructions stored in the non-transitory data storage and executable by the processor to cause the computing system to carry out operations including:

making a prediction of whether both (i) in the dual connectivity, a data split will put a majority of data flow of the UE on the second air-interface connection rather than on the first air-interface connection and (ii) coverage strength of the UE from the second access node will be threshold lower than coverage strength of the UE from the first access node, and

using the prediction as a basis to control whether or not the second air-interface connection will be added for the UE.

16. The computing system of claim 15 , wherein controlling whether or not the second air-interface connection will be added for the UE comprises:

if the prediction is affirmative, then, based at least on the prediction, preventing the second air-interface connection from being added for the UE; and

if the prediction is negative, then, based at least on the prediction, allowing the second air-interface connection to be added for the UE.

17. The computing system of claim 15 , wherein the operations include, to facilitate making the prediction, predicting whether the data split will put the majority of the data flow of the UE on the second air-interface connection rather than on the first air-interface connection, including:

predicting the data split based at least on a comparison between (i) available data capacity of the first air-interface connection and (ii) availability data capacity of the second air-interface connection; and

determining whether the predicted data split will put the majority of the data flow of the UE on the second air-interface connection rather than on the first air-interface connection.

18. The computing system of claim 15 , wherein the operations include, to facilitate making the prediction, predicting whether coverage strength of the UE from the second access node will be threshold lower than coverage strength of the UE from the first access node, including:

determining, based at least on first measurement reporting from the UE, coverage strength of the UE from the second access node;

determining, based at least on second measurement reporting from the UE, coverage strength of the UE from the first access node;

comparing the determined coverage strength of the UE from the second access node with the determined coverage strength of the UE from the first access node; and

based at least on the comparing, determining whether the determined coverage strength of the UE from the second access node is at least as much as a predefined threshold lower than the determined coverage strength of the UE from the first access node.

19. A first access node operable to control whether to establish dual connectivity for a user equipment device (UE) when the UE has a first air-interface connection between the UE and the first access node, wherein establishing the dual connectivity includes adding for the UE a second air-interface connection between the UE and a second access node to enable the UE to be served concurrently by the first access node over the first air-interface connection and the second access node over the second air-interface connection, the first access node comprising:

at least one wireless communication interface including an antenna structure through which to serve the UE over the first air-interface connection;

at least one backhaul communication interface through which to engage in backhaul communication; and

at least one controller, wherein the at least one controller is configured to cause the first access node to carry out operations including:

making a prediction of whether both (i) in the dual connectivity, a data split will put a majority of data flow of the UE on the second air-interface connection rather than on the first air-interface connection and (ii) coverage strength of the UE from the second access node will be threshold lower than coverage strength of the UE from the first access node, and

using the prediction as a basis to control whether or not to add the second air-interface connection for the UE, wherein the control includes (i) if the prediction is affirmative, then, based at least on the prediction, not adding the second air-interface connection for the UE and (ii) if the prediction is negative, then, based at least on the prediction, adding the second air-interface connection for the UE.

20. The first access node of claim 19 , wherein the at least one controller comprises at least one processor, 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 processor to cause the first access node to carry out the operations.