Updating mission critical video communications

1. A method comprising:

determining, by a wireless device, a change in a signal quality measurement of a wireless network;

transmitting, from the wireless device to a mission-critical video (MCVideo) application function (AF) and in response to the determining, a session initiation protocol message for changing one or more media for an MCVideo call in the wireless network;

receiving, by a policy and charging rules function (PCRF) from the MCVideo AF, a DIAMETER AA-request (AAR) command, wherein the DIAMETER AAR command comprises:

a modification bearer message for modifying a quality of service (QoS) of the MCVideo call in the wireless network; and

an application identifier attribute-value pairs (AVP) corresponding to the MCVideo call; and

transmitting, from the PCRF to a policy and charging enforcement function (PCEF), an implementation message comprising an updated QoS;

implementing, by the PCEF, the updated QoS for the MCVideo call in the wireless network, wherein the updated QoS:

comprises QoS data bearer modification information; and

depends on the change in the signal quality measurement of the wireless network.

2. The method of claim 1 , wherein the wireless device transmits the session initiation protocol message in response to the change in the signal quality measurement of the wireless network.

3. The method of claim 1 , further comprising receiving, by the wireless device, a plurality of packets of the MCVideo call on a data bearer.

4. The method of claim 1 , wherein to determine the change in the signal quality, a radio network coverage is measured by the wireless device.

5. The method of claim 1 , wherein the session initiation protocol message comprises at least one of an updated Internet Protocol Multimedia Subsystem communication service indicator (ICSI) and an updated Internet Protocol Multimedia Subsystem application reference indicator (IARI) indicating changing of the one or more media.

6. The method of claim 1 , wherein the session initiation protocol message comprises a session description protocol (SDP) with new media lines and related properties identifying the change of the media.

7. The method of claim 1 , wherein the updated QoS indicates a different number of types of media transmitted to the wireless device.

8. The method of claim 1 , wherein the updated QoS indicates a different number of packets of media transmitted to the wireless device.

9. The method of claim 1 , wherein the implementation message is configured by the PCRF employing, at least in part, subscription data associated with the wireless device.

10. The method of claim 1 , wherein the updated QoS depends on at least one updated QoS Class Identifier (QCI).

11. A method comprising:

receiving, by a mission-critical video (MCVideo) application function (AF) from a wireless device, a session initiation protocol message for changing one or more media for an MCVideo call in a wireless network;

transmitting, by the MCVideo AF to a policy and charging rules function (PCRF) and in response to the session initiation protocol message, a DIAMETER AA-request (AAR) command, wherein the DIAMETER AAR command comprises:

a modification bearer message for modifying a quality of service (QoS) of the MCVideo call in the wireless network; and

an application identifier attribute-value pairs (AVP) corresponding to the MCVideo call; and

transmitting, from the PCRF to a policy and charging enforcement function (PCEF), an implementation message comprising an updated QoS;

implementing, by the PCEF, the updated QoS for the MCVideo call in the wireless network, wherein the updated QoS:

comprises QoS data bearer modification information; and

depends on a change in a signal quality measurement of the wireless network.

12. The method of claim 11 , wherein the wireless device transmits the session initiation protocol message in response to the change in the signal quality measurement of the wireless network.

13. The method of claim 11 , further comprising receiving, by the wireless device, a plurality of packets of the MCVideo call on a data bearer.

14. The method of claim 11 , wherein the signal quality measurement of the wireless network is measured by the wireless device.

15. The method of claim 11 , wherein the session initiation protocol message comprises at least one of an updated Internet Protocol Multimedia Subsystem communication service indicator (ICSI) and an updated Internet Protocol Multimedia Subsystem application reference indicator (IARI) indicating change of the one or more media.

16. The method of claim 11 , wherein the session initiation protocol message comprises a session description protocol (SDP) with new media lines and related properties identifying the change of the media.

17. The method of claim 11 , wherein the updated QoS indicates a different number of types of media transmitted to the wireless device.

18. The method of claim 11 , wherein the updated QoS indicates a different number of packets of media transmitted to the wireless device.

19. The method of claim 11 , wherein the implementation message is configured by the PCRF employing, at least in part, subscription data associated with the wireless device.

20. The method of claim 11 , wherein the updated QoS depends on at least one updated QoS Class Identifier (QCI).