Device handover in a wireless network

1. A system comprising:

a wireless device comprising:

one or more first processors; and

first memory storing first instructions that, when executed by the one or more first processors, cause the wireless device to transmit to a first base station, at least one measurement report comprising signal quality information of one or more carriers, the wireless device having one connection with the first base station, the connection being configurable to carry a plurality of calls, each call of the plurality of calls being from a call category in a plurality of call categories; and

the first base station comprising:

one or more second processors; and

second memory storing second instructions that, when executed by the one or more second processors, cause the first base station to initiate a handover of the connection to a second base station based on criteria on the signal quality information, the criteria being employed for handover at least when the connection comprises a plurality of calls of different call types, the criteria comprising a first criterion and a second criterion different from the first criterion, the first criterion being employed if the connection engages in an active call from a first call category of the plurality of call categories, the second criterion being employed if the connection does not engage in an active call from the first call category, wherein:

the first call category is a delay-sensitive call; and

the first base station is of a different type compared with the second base station.

2. The system of claim 1 , wherein the active call is carried over a radio bearer.

3. The system of claim 1 , wherein the at least one measurement report comprises:

at least one channel state information report; and

at least one RRC measurement report.

4. The system of claim 1 , wherein each of the first criterion and the second criterion considers a relative signal quality value.

5. The system of claim 4 , wherein the relative signal quality value considers a first signal quality value of a first carrier of the first base station and a second signal quality value of a second carrier of the second base station.

6. The system of claim 5 , wherein the first criterion is based on comparison of the relative signal quality value with a first threshold value, and the second criterion is based on comparison of the relative signal quality value with a second threshold value.

7. The system of claim 5 , wherein the second signal quality value considers a measured signal quality value and a bias value.

8. The system of claim 1 , wherein a user of the wireless device is billed differently by a service provider for:

calls from the first call category that are carried through the first base station; and

calls from the first call category that are carried through the second base station.

9. The system of claim 1 , wherein the second instructions when executed further cause the first base station to receive a proximity indication message from the wireless device before transmitting the first control message, the proximity indication message indicating that the wireless device entered a proximity of the second base station.

10. A method comprising:

transmitting, by a wireless device to a first base station, at least one measurement report comprising signal quality information of one or more carriers, the wireless device having one connection with the first base station, the connection being configurable to carry a plurality of calls, each call of the plurality of calls being from a call category in a plurality of call categories; and

initiating, by the first base station, a handover of the connection to a second base station based on criteria on the signal quality information, the criteria being employed for handover at least when the connection comprises a plurality of calls of different call types, the criteria comprising a first criterion and a second criterion different from the first criterion, the first criterion being employed if the connection engages in an active call from a first call category of the plurality of call categories, the second criterion being employed if the connection does not engage in an active call from the first call category, wherein:

the first call category is a delay-sensitive call; and

the first base station is of a different type compared with the second base station.

11. The method of claim 10 , wherein the active call is carried over a radio bearer.

12. The method of claim 10 , wherein the at least one measurement report comprises:

at least one channel state information report; and

at least one RRC measurement report.

13. The method of claim 10 , wherein each of the first criterion and the second criterion considers a relative signal quality value.

14. The method of claim 13 , wherein the relative signal quality value considers a first signal quality value of a first carrier of the first base station and a second signal quality value of a second carrier of the second base station.

15. The method of claim 14 , wherein the first criterion is based on comparison of the relative signal quality value with a first threshold value, and the second criterion is based on comparison of the relative signal quality value with a second threshold value.

16. The method of claim 14 , wherein the second signal quality value considers a measured signal quality value and a bias value.

17. The method of claim 10 , wherein a user of the wireless device is billed differently by a service provider for:

calls from the first call category that are carried through the first base station; and

calls from the first call category that are carried through the second base station.

18. The method of claim 10 , wherein:

the first base station is a macro base station; and

the second base station is a femto base station.

19. The method of claim 10 , further comprising:

transmitting, by the first base station, a first control message to a network node in a wireless network after a handover decision;

receiving, by the first base station, a second control message from the network node, the second control message indicating that the second base station accepted a handover request; and

transmitting, by the first base station, a handover command to the wireless device.

20. The method of claim 19 , further comprising receiving, by the first base station, a proximity indication message from the wireless device before transmitting the first control message, the proximity indication message indicating that the wireless device entered a proximity of the second base station.