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1. WO2021013753 - METHODS, APPARATUS AND MACHINE-READABLE MEDIA RELATING TO DUAL- OR MULTI-CONNECTIVITY IN A WIRELESS COMMUNICATION NETWORK

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[ EN ]

CLAIMS

1. A method performed by a base station (806, 960, 1900) of a wireless communication network, the base station being configured as a secondary node for a wireless device (802) having dual- or multiconnectivity to the wireless communication network via a master node (804) and one or more secondary nodes comprising the base station, the method comprising:

- causing (1804) transmission of a message to the master node, the message comprising an indication that the base station is releasing resources associated with one or more layers of a radio connection between the base station and the wireless device.

2. The method of claim 1 , wherein the one or more layers comprise a subset of the total layers of the radio connection between the base station and the wireless device.

3. The method of claim 2, wherein the base station maintains a context or configuration for one or more layers not belonging to the subset.

4. The method of any preceding claim, wherein the base station causes transmission of the message to the master node while the wireless device is in an inactive mode, or while the radio connection between the wireless device and the base station is suspended.

5. The method of any preceding claim, wherein the base station causes transmission of the message to the master node upon a determination that the resources associated with the one or more layers of the radio connection between the base station and the wireless device are required for allocation to one or more radio connections with one or more other wireless devices.

6. The method of any preceding claim, wherein the message is a first message, and further comprising causing (1806) transmission of a second message to the master node, the second message comprising an indication that the base station is re-allocating resources to the one or more layers of the radio connection between the base station and the wireless device.

7. A method performed by a base station (806, 960, 1900) of a wireless communication network, the base station being configured as a secondary node for a wireless device (802) having dual- or multiconnectivity to the wireless communication network via a master node (804) and one or more secondary nodes comprising the base station, the method comprising:

- receiving (1802), from the master node, a message comprising a first indication that a radio connection between the base station and the wireless device is suspended, and a second indication of a time period for which the base station is to maintain an allocation of resources associated with one or more layers of the radio connection between the base station and the wireless device despite the suspension of that radio connection.

8. The method of claim 7, wherein the message is a first message, and further comprising causing (1804) transmission of a second message to the master node, the second message comprising an indication of a time period for which the base station intends to maintain the allocation of resources associated with one or more layers of the radio connection between the base station and the wireless device.

9. The method of claim 7 or 8, wherein the one or more layers comprise a subset of the total layers of the radio connection between the base station and the wireless device.

10. The method of any one of claims 7 to 9, wherein the base station receives the message from the master node while the wireless device is in an inactive mode, or while the radio connection between the wireless device and the base station is suspended.

11. A method performed by a base station (804, 960, 2100) of a wireless communication network, the base station being configured as a master node for a wireless device (802) having dual- or multi-connectivity to the wireless communication network via the base station and one or more secondary nodes (806), the method comprising:

- receiving (2004) a message from a secondary node of the one or more secondary nodes, the message comprising an indication that the secondary node is releasing resources associated with one or more layers of a radio connection between the secondary node and the wireless device.

12. The method of claim 11 , wherein the one or more layers comprise a subset of the total layers of the radio connection between the secondary node and the wireless device.

13. The method of claim 12, wherein the secondary node maintains a context or configuration for one or more layers not belonging to the subset.

14. The method of any one of claims 11 to 13, wherein the base station receives the message from the secondary node while the wireless device is in an inactive mode, or while the radio connection between the wireless device and the base station is suspended.

15. The method of claim 14, further comprising, while the wireless device is in the inactive mode, or while the radio connection between the wireless device and the base station is suspended, refraining (2006) from informing the wireless device the secondary node is releasing resources associated with the one or more layers of the radio connection between the secondary node and the wireless device.

16. The method of any one of claims 11 to 15, wherein the message is a first message, and further comprising, responsive to a determination that the radio connection between the secondary node and the wireless device is to be resumed, and that the resources associated with one or more layers of the radio connection between the secondary node and the wireless device are released, causing transmission to the wireless device of a second message, the second message comprising an indication that the radio connection between the wireless device and the secondary node is to be reconfigured.

17. The method of any one of claims 1 1 to 16, wherein the message is a first message, and further comprising receiving (2006) a third message from the secondary node, the third message comprising an indication that the secondary node is re-allocating resources to the one or more layers of the radio connection between the secondary node and the wireless device.

18. A method performed by a base station (804, 960, 2100) of a wireless communication network, the base station being configured as a master node for a wireless device (802) having dual- or multi-connectivity to the wireless communication network via the base station and one or more secondary nodes (806), the method comprising:

- causing (2002) transmission, to a secondary node of the one or more secondary nodes, of a message comprising a first indication that a radio connection between the secondary node and the wireless device is suspended, and a second indication of a time period for which the secondary node is to maintain an allocation of resources associated with one or more layers of the radio connection between the secondary node and the wireless device despite the suspension of that radio connection.

19. The method of claim 18, wherein the message is a first message, and further comprising receiving (2004) a second message from the secondary node, the second message comprising an indication of a time period for which the secondary node intends to maintain the allocation of resources associated with one or more layers of the radio connection between the secondary node and the wireless device.

20. The method of claim 18 or 19, wherein the one or more layers comprise a subset of the total layers of the radio connection between the secondary node and the wireless device.

21. The method of any one of claims 18 to 20, wherein the base station causes the message to be transmitted to the secondary node while the wireless device is in an inactive mode, or while the radio connection between the wireless device and the secondary node is suspended.

22. The method of any one of the preceding claims wherein the one or more layers comprise the one or more lowest layers of the radio connection between the secondary node and the wireless device.

23. The method of any one of the preceding claims, wherein the one or more layers comprise one or more of: a radio link control, RLC, layer; a medium access control, MAC, layer; and a physical, PHY, layer. 24. The method of any one of the preceding claims, wherein the one or more layers comprise one or more of: a packet data convergence protocol, PDCP, layer; and a service data adaptation protocol, SDAP, layer.

25. A base station (806, 960, 2100), the base station being configured as a secondary node for a wireless device having dual- or multi-connectivity to a wireless communication network via a master node and one or more secondary nodes comprising the base station, the base station comprising:

- processing circuitry (970) configured to cause the base station to cause transmission of a message to the master node, the message comprising an indication that the base station is releasing resources associated with one or more layers of a radio connection between the base station and the wireless device; and

- power supply circuitry (987) configured to supply power to the base station.

26. The base station of claim 25, wherein the one or more layers comprise a subset of the total layers of the radio connection between the base station and the wireless device.

27. The base station of claim 26, wherein the base station maintains a context or configuration for one or more layers not belonging to the subset.

28. The base station of any one of claims 25 to 27, wherein the base station causes transmission of the message to the master node while the wireless device is in an inactive mode, or while the radio connection between the wireless device and the base station is suspended.

29. The base station of any one of claims 25 to 28, wherein the base station causes transmission of the message to the master node upon a determination that the resources associated with the one or more layers of the radio connection between the base station and the wireless device are required for allocation to one or more radio connections with one or more other wireless devices.

30. The base station of any one of claims 25 to 29, wherein the message is a first message, and further comprising causing transmission of a second message to the master node, the second message comprising an indication that the base station is re-allocating resources to the one or more layers of the radio connection between the base station and the wireless device.

31. A base station (806, 960, 2100), the base station being configured as a secondary node for a wireless device having dual- or multi-connectivity to a wireless communication network via a master node and one or more secondary nodes comprising the base station, the base station comprising:

- processing circuitry (970) configured to cause the base station to receive, from the master node, a message comprising a first indication that a radio connection between the base station and the wireless device is suspended, and a second indication of a time period for which the base station is to maintain an allocation of resources associated with one or more layers of the radio connection between the base station and the wireless device despite the suspension of that radio connection; and

- power supply circuitry (987) configured to supply power to the base station.

32. The base station of claim 31 , wherein the message is a first message, and further comprising causing transmission of a second message to the master node, the second message comprising an indication of a time period for which the base station intends to maintain the allocation of resources associated with one or more layers of the radio connection between the base station and the wireless device.

33. The base station of claim 31 or 32, wherein the one or more layers comprise a subset of the total layers of the radio connection between the base station and the wireless device.

34. The base station of any one of claims 31 to 33, wherein the base station receives the message from the master node while the wireless device is in an inactive mode, or while the radio connection between the wireless device and the base station is suspended.

35. A base station (804, 960, 2100), the base station being configured as a master node for a wireless device having dual- or multi-connectivity to a wireless communication network via the base station and one or more secondary nodes, the base station comprising:

- processing circuitry (970) configured to cause the base station to receive a message from a secondary node of the one or more secondary nodes, the message comprising an indication that the secondary node is releasing resources associated with one or more layers of a radio connection between the secondary node and the wireless device; and

- power supply circuitry (987) configured to supply power to the base station.

36. The base station of claim 35, wherein the one or more layers comprise a subset of the total layers of the radio connection between the secondary node and the wireless device.

37. The base station of claim 36, wherein the secondary node maintains a context or configuration for one or more layers not belonging to the subset.

38. The base station of any one of claims 35 to 37, wherein the base station receives the message from the secondary node while the wireless device is in an inactive mode, or while the radio connection between the wireless device and the base station is suspended.

39. The base station of claim 38, further comprising, while the wireless device is in the inactive mode, or while the radio connection between the wireless device and the base station is suspended, refraining from informing the wireless device the secondary node is releasing resources associated with the one or more layers of the radio connection between the secondary node and the wireless device.

40. The base station of any one of claims 35 to 39, wherein the message is a first message, and further comprising, responsive to a determination that the radio connection between the secondary node and the wireless device is to be resumed, and that the resources associated with one or more layers of the radio connection between the secondary node and the wireless device are released, causing transmission to the wireless device of a second message, the second message comprising an indication that the radio connection between the wireless device and the secondary node is to be reconfigured.

41. The base station of any one of claims 35 to 40, wherein the message is a first message, and further comprising receiving a third message from the secondary node, the third message comprising an indication that the secondary node is re-allocating resources to the one or more layers of the radio connection between the secondary node and the wireless device.

42. A base station (804, 960, 2100), the base station being configured as a master node for a wireless device having dual- or multi-connectivity to a wireless communication network via the base station and one or more secondary nodes, the base station comprising:

- processing circuitry (970) configured to cause the base station to cause transmission, to a secondary node of the one or more secondary nodes, of a message comprising a first indication that a radio connection between the secondary node and the wireless device is suspended, and a second indication of a time period for which the secondary node is to maintain an allocation of resources associated with one or more layers of the radio connection between the secondary node and the wireless device despite the suspension of that radio connection; and

- power supply circuitry (987) configured to supply power to the base station.

43. The base station of claim 42, wherein the message is a first message, and further comprising receiving a second message from the secondary node, the second message comprising an indication of a time period for which the secondary node intends to maintain the allocation of resources associated with one or more layers of the radio connection between the secondary node and the wireless device.

44. The base station of claim 42 or 43, wherein the one or more layers comprise a subset of the total layers of the radio connection between the secondary node and the wireless device.

45. The base station of any one of claims 42 to 44, wherein the base station causes the message to be transmitted to the secondary node while the wireless device is in an inactive mode, or while the radio connection between the wireless device and the secondary node is suspended.

46. The base station of any one of claims 25 to 45, wherein the one or more layers comprise the one or more lowest layers of the radio connection between the secondary node and the wireless device.

47. The base station of any one of claims 25 to 46, wherein the one or more layers comprise one or more of: a radio link control, RLC, layer; a medium access control, MAC, layer; and a physical, PHY, layer.

48. The base station of any one of claims 25 to 47, wherein the one or more layers comprise one or more of: a packet data convergence protocol, PDCP, layer; and a service data adaptation protocol, SDAP, layer.