Methods and systems for determining downlink data mode

1. A method of controlling downlink data transmission, the method comprising:

determining to wirelessly transmit to a user equipment in a coordinated multipoint mode based on at least (i) channel state information for the user equipment and (ii) additional information;

wirelessly transmitting first downlink data from a plurality of serving nodes to the user equipment in the coordinated multipoint mode after the determining to transmit to the user equipment in the coordinated multipoint mode;

determining to wirelessly transmit to the user equipment in an alternative downlink data transmission mode based at least in part on a change in at least one of (i) the channel state information for the user equipment or (ii) the additional information, wherein the alternative downlink data transmission mode is different than the coordinated multipoint mode; and

wirelessly transmitting second downlink data to the user equipment in the alternative downlink data transmission mode after the determining to transmit to the user equipment in the alternative downlink data transmission mode.

2. The method of claim 1 , wherein the additional information comprises network loading information.

3. The method of claim 1 , wherein the additional information identifies one or more characteristics of the user equipment.

4. The method of claim 1 , wherein the additional information identifies one or more characteristics of a remote radio unit serving the user equipment.

5. The method of claim 1 , wherein the plurality of serving nodes comprise remote radio units.

6. The method of claim 1 , wherein the alternative downlink data transmission mode is a macro diversity mode.

7. The method of claim 1 , wherein the alternative downlink data transmission mode is a single-frequency network mode.

8. The method of claim 1 , wherein the alternative downlink data transmission mode is a non-coherent combining mode.

9. The method of claim 1 , wherein the alternative downlink data transmission mode is a best server selection mode.

10. A network system for downlink data transmission in multiple-modes, the network system comprising:

serving nodes; and

a baseband unit in communication with the serving nodes, the baseband unit comprising a processor and storing instructions, wherein the processor is configured to execute the instructions to:

determine to wirelessly transmit to a user equipment in a coordinated multipoint mode based on at least (i) channel state information for the user equipment and (ii) additional information;

cause wireless transmission of first downlink data from a plurality of the serving nodes to the user equipment in the coordinated multipoint mode;

determine to wirelessly transmit to the user equipment in an alternative downlink data transmission mode based at least in part on a change in at least one of (i) the channel state information for the user equipment or (ii) the additional information, wherein the alternative downlink data transmission mode is different than the coordinated multipoint mode; and

cause wireless transmission of second downlink data to the user equipment in the alternative downlink data transmission mode from at least one of the serving nodes.

11. The network system of claim 10 , wherein the alternative downlink data transmission mode is a macro diversity mode.

12. The network system of claim 10 , wherein the processor is configured to execute the instructions to determine to wirelessly transmit to the user equipment in the alternative downlink data transmission mode based at least in part on the channel state information for the user equipment changing.

13. The network system of claim 10 , wherein the processor is configured to execute the instructions to determine to wirelessly transmit to the user equipment in the alternative downlink data transmission mode based at least in part on network loading.

14. A network system for downlink data transmission in multiple-modes, the network system comprising:

serving nodes; and

a baseband unit in communication with the serving nodes, the baseband unit comprising a processor and storing instructions, wherein the processor is configured to execute the instructions to cause wireless transmission of first downlink data to a user equipment from a plurality of serving nodes in a coordinated multipoint mode, determine to wirelessly transmit to the user equipment in an alternative downlink data transmission mode that is different than the coordinated multipoint mode, and cause wireless transmission of second downlink data to the user equipment in the alternative downlink data transmission mode from at least one of the serving nodes.

15. The network system of claim 14 , wherein the serving nodes comprise remote radio units.

16. The network system of claim 14 , wherein the alternative downlink data transmission mode is a macro diversity mode.

17. The network system of claim 14 , wherein the alternative downlink data transmission mode is one of a single-frequency network mode, non-coherent combining mode, or best server selection mode.

18. The network system of claim 14 , wherein the processor is configured to execute the instructions to determine to wirelessly transmit to the user equipment in the alternative downlink data transmission mode based at least in part on a change in channel state information for the user equipment.

19. The network system of claim 14 , wherein the processor is configured to execute the instructions to determine to wirelessly transmit to the user equipment in the alternative downlink data transmission mode based at least in part on network loading.

20. The network system of claim 14 , wherein the processor is configured to execute the instructions to determine to wirelessly transmit to the user equipment in the alternative downlink data transmission mode based at least in part on an increase in mobility of the user equipment.