Conditional configuration in a wireless communication network
A wireless device ( 16 ) receives a control message ( 26 ) indicating a conditional configuration ( 28 - 1 ) that the wireless device ( 16 ) is to add, modify, or release for a link ( 20 ). The control message ( 26 ) includes configuration-specific information ( 30 - 1 ) that distinguishes the conditional configuration ( 28 - 1 ) from one or more other conditional configurations that are configurable for the link ( 20 ). The configuration-specific information ( 30 - 1 ) may for example includes a conditional configuration identifier that is unique at least among any conditional configurations configured for the link ( 20 ).
1. A method performed by a wireless device, the method comprising:
receiving, from a radio network node, a control message indicating a conditional handover configuration that contains a handover configuration and one or more trigger conditions whose fulfillment is to trigger execution of the handover configuration by the wireless device, wherein the control message includes configuration-specific information that distinguishes the conditional handover configuration from one or more other conditional handover configurations that are configurable for a link, wherein the configuration-specific information includes a radio network temporary identifier (RNTI) and/or a random access channel configuration that are unique at least among any conditional handover configurations configured for the link; and
based on fulfillment of the one or more trigger conditions, applying the handover configuration by transmitting a control message of a random access procedure to a radio network node, the control message of the random access procedure including the RNTI and/or being transmitted according to the random access channel configuration.
2. The method of claim 1 , wherein the configuration-specific information includes the RNTI, wherein the RNTI is unique at least among any conditional handover configurations configured for the link.
3. The method of claim 1 , wherein the configuration-specific information includes the random access channel configuration, wherein the random access channel configuration is unique at least among any conditional handover configurations configured for the link.
4. The method of claim 1 , wherein the link is a link to a cell or a radio network node.
5. The method of claim 1 , wherein the control message is received from a source link for the conditional configuration.
6. The method of claim 1 , wherein the control message is received, via a source link for the conditional handover configuration, from a target link for the conditional handover configuration, wherein the control message is or is included in a transparent container that the source link transparently forwards from the target link to the wireless device.
7. The method of claim 1 , further comprising adding the conditional handover configuration for the link in accordance with the received control message.
8. A method performed by a radio network node, the method comprising:
transmitting, to another radio network node, a control message indicating a conditional handover configuration that contains a handover configuration and one or more trigger conditions whose fulfillment is to trigger execution of the handover configuration by a wireless device, wherein the control message includes configuration-specific information that distinguishes the conditional handover configuration from one or more other conditional handover configurations that are configurable for a link, wherein the configuration-specific information includes a radio network temporary identifier (RNTI) and/or a random access channel configuration that are unique at least among any conditional handover configurations configured for the link; and
receiving, from the wireless device, a control message of a random access procedure, the control message of the random access procedure including the RNTI and/or being transmitted according to the random access channel configuration.
9. The method of claim 8 , further comprising determining, from the RNTI included in the control message and/or from the random access channel configuration according to which the control message was transmitted, a conditional handover configuration applied by the wireless device for the link.
10. The method of claim 9 , further comprising releasing one or more resources reserved for the link according to one or more other conditional handover configurations.
11. The method of claim 8 , wherein the configuration-specific information includes the RNTI, wherein the RNTI is unique at least among any conditional handover configurations configured for the link.
12. The method of claim 8 , wherein the configuration-specific information includes the random access channel configuration, wherein the random access channel configuration is unique at least among any conditional handover configurations configured for the link.
13. The method of claim 8 , wherein the link is a link to a cell or a radio network node.
14. The method of claim 8 , further comprising triggering addition, modification, or release of the conditional handover configuration for the link, based on network conditions and/or traffic conditions for the wireless device, or responsive to one or more of:
a change in availability of resources needed for the conditional handover configuration;
the wireless device applying a different conditional handover configuration;
a change in resource requirements that are required for communicating traffic to or from the wireless device; or
a change in channel conditions at the wireless device.
15. The method of claim 8 , wherein the radio network node is a target radio network node for the conditional configuration and/or provides a target cell candidate for the conditional handover configuration, and wherein the method further comprises triggering, by the target radio network node, addition, modification, or release of the conditional handover configuration for the link.
16. The method of claim 8 , wherein the radio network node is a target radio network node for the conditional handover configuration and/or provides a target cell candidate for the conditional handover configuration.
17. The method of claim 16 , wherein transmitting the control message comprises transmitting a container to a source radio network node for the conditional handover configuration, wherein the container includes the control message.
18. A wireless device comprising:
communication circuitry; and
processing circuitry configured to;
receive, from a radio network node, a control message indicating a conditional handover configuration that contains a handover configuration and one or more trigger conditions whose fulfillment is to trigger execution of the handover configuration by the wireless device, wherein the control message includes configuration-specific information that distinguishes the conditional handover configuration from one or more other conditional handover configurations that are configurable for a link, wherein the configuration-specific information includes a radio network temporary identifier (RNTI) and/or a random access channel configuration that are unique at least among any conditional handover configurations configured for the link; and
based on fulfillment of the one or more trigger conditions, apply the handover configuration by transmitting a control message of a random access procedure to a radio network node, the control message of the random access procedure including the RNTI and/or being transmitted according to the random access channel configuration.
19. A radio network node comprising:
communication circuitry; and
processing circuitry configured to:
transmit, to another radio network node, a control message indicating a conditional handover configuration that contains a handover configuration and one or more trigger conditions whose fulfillment is to trigger execution of the handover configuration by a wireless device, wherein the control message includes configuration-specific information that distinguishes the conditional handover configuration from one or more other conditional handover configurations that are configurable for a link, wherein the configuration-specific information includes a radio network temporary identifier (RNTI) and/or a random access channel configuration that are unique at least among any conditional handover configurations configured for the link; and
receive, from the wireless device, a control message of a random access procedure, the control message of the random access procedure including the RNTI and/or being transmitted according to the random access channel configuration.