Signaling a new information element for the mobility state estimate of moving relay user equipments

1. An apparatus provided at a mobile relay node, the apparatus comprising:

a processor configured to:

detect whether a handover of a user equipment from the mobile relay node to a target cell is required,

if the handover is required, set an actual mobility state of the user equipment to a mobility state of the mobile relay node, and

send the actual mobility state of the user equipment, which has been set to the mobility state of the mobile relay node, to a network element of the target cell.

2. The apparatus according to claim 1 , wherein:

the processor is configured to send the actual mobility state of the user equipment in a handover request message.

3. The apparatus according to claim 1 , wherein:

the processor is configured to detect whether the mobile relay node and the target cell are moving relative to each other, and to send the actual mobility state of the user equipment to the network element if the mobile relay node and the target cell are moving relative to each other.

4. The apparatus according to claim 1 , wherein:

the processor is configured to send the actual mobility state of the user equipment during the handover by adjusting one or more mobility parameters of the user equipment.

5. The apparatus according to claim 1 , wherein:

the processor is configured to relay communications between the user equipment and the network element.

6. The apparatus according to claim 1 , wherein:

the processor is configured to set the actual mobility state of the user equipment when the mobile relay node and the network element are moving relative to each other, and when the mobile relay node and the user equipment are generally stationary relative to each other.

7. The apparatus according to claim 2 , wherein:

the processor is configured to send the actual mobility state of the user equipment in a new Information Element (IE) of the handover request message.

8. The apparatus according to claim 7 , wherein a priority of the new IE of the handover request message is set higher than a priority of a historical IE of the handover request message.

9. An apparatus provided at a network element of a target cell, the apparatus comprising:

a processor configured to:

receive, in a handover request message from a mobile relay node, an actual mobility state of a user equipment, wherein the user equipment is to perform a handover from the mobile relay node to the network element, and wherein the actual mobility state of the user equipment is set to a mobility state of the mobile relay node, and

use the received actual mobility state of the user equipment, which has been set to the mobility state of the mobile relay node, for preparing the handover of the user equipment.

10. The apparatus according to claim 9 , wherein:

the processor is configured to adapt one or more mobility parameters of the user equipment after receiving the actual mobility state of the user equipment.

11. An apparatus provided at a user equipment, the apparatus comprising:

a processor configured to:

receive, from a mobile relay node, an actual mobility state of the mobile relay node,

replace a mobility state of the user equipment with the received actual mobility state of the mobile relay node when preparing a handover of the user equipment from the mobile relay node to a network control element of a target cell; and

send, by the user equipment, the mobility state of the user equipment, which has been replaced with the mobility state of the mobile relay node, to the network control element of the target cell.

12. The apparatus according to claim 11 , wherein the mobile relay node and the network control element are moving relative to each other.

13. The apparatus according to claim 11 , wherein:

the processor is configured to send the received actual mobility state to the network control element.

14. A method comprising:

providing, by a mobile relay node, a connection between the mobile relay node and a user equipment,

detecting, by the mobile relay node, whether a handover of the user equipment from the mobile relay node to a target cell is required,

if the handover is required, setting, by the mobile relay node, an actual mobility state of the user equipment to a mobility state of the mobile relay node, and

sending the actual mobility state of the user equipment, which has been set to the mobility state of the mobile relay node, to a network element of the target cell.

15. The method according to claim 14 , further comprising:

send the actual mobility state of the user equipment in a handover request message.

16. The method according to claim 14 , wherein the sending comprises:

detecting that the mobile relay node and the network element of the target cell are moving relative to each other, and

sending the actual mobility state of the user equipment to the target cell based on detecting that the mobile relay node and the network element are moving relative to each other.

17. The method according to claim 14 , wherein:

the network element comprises the user equipment.

18. The method according to claim 17 , further comprising performing at least one of the following:

storing the received actual mobility state of the user equipment in a variable at the user equipment, and

updating the mobility state of the user equipment based on the received actual mobility state of the user equipment.

19. The method according to claim 14 , further comprising:

sending the actual mobility state of the user equipment during the handover by adjusting one or more mobility parameters of the user equipment.

20. The method according to claim 14 , further comprising:

providing, by the mobile relay node, a connection to the network element, and

relaying, by the mobile relay node, communications between the user equipment and the network element.

21. The method according to claim 14 , wherein sending the actual mobility state of the user equipment in a handover request message comprises sending the actual mobility state of the user equipment in a new Information Element (IE) of the handover request message.

22. A method comprising:

receiving, by a network element, a handover request message from a mobile relay node, wherein the handover request message including information representing an actual mobility state of a user equipment, wherein the user equipment is to perform a handover from the mobile relay node to the network element, and wherein the actual mobility state of the user equipment is set based on a mobility state of the mobile relay node, and

using the received actual mobility state of the user equipment, which has been set to the mobility state of the mobile relay node, for preparing the handover of the user equipment.

23. The method according to claim 22 , further comprising:

adapting one or more mobility parameters of the user equipment after receiving the actual mobility state of the user equipment.

24. A method comprising:

receiving, by a user equipment, a mobility state of a mobile relay node from the mobile relay node, and

replacing, by the user equipment, an actual mobility state of the user equipment with the received mobility state of the mobile relay node when preparing a handover from the mobile relay node to a network control element, and

sending, by the user equipment, the mobility state of the user equipment, which has been replaced with the mobility state of the mobile relay node, to the network control element of the target cell.

25. The method according to claim 24 , wherein the mobile relay node and the network control element are moving relative to each other.

26. The method of claim 24 , further comprising:

sending, by the user equipment, the actual mobility state of the user equipment to the network control element.