Methods and arrangements in a telecommunication system
The present invention relates to exchanging a cell-specific parameter such as the A-MPR, comprising information related to a required additional maximum power reduction of a UE transmitter between networks nodes. The networks nodes may be radio base stations or other network nodes such as radio network controllers or core network nodes exemplified by access gateways (aGWs). By exchanging this cell-specific parameter with information of the required additional maximum power reduction between the network nodes, the cell-specific parameter is provided to the radio base station of the serving cell which implies that the serving cell can send the cell-specific parameter of the target cell to the UE prior to the handover from the serving cell to the target cell. This result in that the UE can start transmission to the target cell with the correct cell-specific parameter and the out-of-band emission requirements can be fulfilled in the target cell.
1. A method for a network node of a wireless communication network, wherein the network node is adapted to serve at least one cell and to wirelessly control at least one User Equipment, UE, located in one of the at least one cell, comprising the steps of:
receiving, prior to handover of a UE from the network node to a further network node, a cell-specific parameter associated with a cell served by the further network node, the cell-specific parameter comprises information related to a required additional maximum power reduction of a transmitter of the UE controlled by said network node such that the required additional maximum power reduction of the transmitter of the UE controlled by said network node allows for the UE to meet an out of band emission requirement at handover, and
transmitting, prior to handover of the UE from the network node to the further network node, the received cell-specific parameter to the UE controlled by said network node such that the UE can use the cell-specific parameter when being handed over to the further network node.
2. The method according to claim 1 , wherein the cell-specific parameter is received transparently by the network node.
3. The method according to claim 1 , wherein the cell-specific parameter is received by a background process.
4. The method according to claim 1 , wherein the cell-specific parameter is represented by flag bits if the additional maximum power reduction is unchanged compared to that of the said serving cell.
5. The method according to claim 1 , wherein the network node is a radio base station.
6. The method according to claim 5 , wherein it comprises the further step of:
including the received cell-specific parameter in system information when transmitting the cell-specific parameter to the UE.
7. The method according to claim 1 , wherein the further network node is a radio base station.
8. The method according to claim 7 , wherein the cell-specific parameter is received from a further radio base station over an X2 interface.
9. The method according to claim 7 , wherein the cell-specific parameter is received from the further network node via an access gateway.
10. The method according to claim 7 , wherein the cell-specific parameter is received from the further network node via a radio network controller.
11. The method according to claim 10 , wherein the cell-specific parameter is received over an lur interface.
12. The method according to claim 10 , wherein the cell-specific parameter is received over a S1 interface.
13. The method according to claim 1 , wherein the first network node and the further network node are radio network controllers and the cell-specific parameter is received over an lub interface and transmitted to the UE via a radio base station controlling the UE.
14. The method according to claim 1 , wherein the first network node and the further network node are access gateways and the cell-specific parameter is received via backbone network connected said access gateways and transmitted to the UE via a radio base station controlling the UE.
15. A method for a network node of a wireless communication network, wherein the network node is adapted to serve at least one cell and to wirelessly control at least one User Equipment, UE, located in one of the at least one cell, comprising the step of:
transmitting, prior to handover of a UE from the network node to a further network node, a cell-specific parameter associated with a cell served by the network node to the further network node controlling the UE to be handed over to said network node, wherein the cell-specific parameter comprises information related to a required additional maximum power reduction of a transmitter of the UE controlled by said network node such that the required additional maximum power reduction of the transmitter of the UE controlled by said network node allows for the UE to meet an out of band emission requirement at handover, such that the further network node can transmit the received cell-specific parameter to the UE controlled by the further network node and that the UE can use the cell-specific parameter when being handed over to the network node.
16. The method according to claim 15 , wherein the cell-specific parameter is transmitted together with handover related parameters.
17. The method according to claim 15 , wherein the network node is a radio base station.
18. The method according to claim 15 , wherein the further network node is a radio base station.
19. The method according to claim 18 , wherein the cell-specific parameter is transmitted to the further radio base station over an X2 interface.
20. The method according to claim 15 , wherein the network node is a gateway wherein the cell specific parameter is transmitted to the network node controlling the UE via a further gateway.
21. A network node of a wireless communication network, wherein the network node is adapted to serve at least one cell and to wirelessly control at least one User Equipment, UE, located in one of the at least one cell, comprising:
means for receiving a cell-specific parameter associated with a cell served by a further network node, the cell-specific parameter comprises information related to a required additional maximum power reduction of a transmitter of a UE controlled by said network node prior to handover of the UE from the network node to the further network node such that the required additional maximum power reduction of the transmitter of the UE controlled by said network node allows for the UE to meet an out of band emission requirement at handover, and
means for transmitting the received cell-specific parameter to the UE controlled by said network node such that the UE can use the cell-specific parameter when being handed over to the further network node prior to handover of the UE from the network node to the further network node.
22. The network node according to claim 21 , wherein the network node is a radio base station.
23. The network node according to claim 22 , wherein it comprises means for including the received cell-specific parameter in system information when transmitting the cell-specific parameter to the UE.
24. The network node according to claim 21 , wherein the further network node is a radio base station.
25. The network node according to claim 24 , wherein the cell-specific parameter is received from a further radio base station over an X2 interface.
26. The network node according to claim 24 , wherein the cell-specific parameter is received from the further network node via an access gateway.
27. The network node according to claim 26 , wherein the cell-specific parameter is received over a S1 interface.
28. The network node according to claim 24 , wherein the cell-specific parameter is received from the further network node via a radio network controller.
29. The network node according to claim 28 , wherein the cell-specific parameter is received over an lur interface.
30. The network node according to claim 21 , wherein the first network node and the further network node are radio network controllers and the cell-specific parameter is received over an lub interface and transmitted to the UE via a radio base station controlling the UE.
31. The network node according to claim 21 , wherein the first network node and the further network node are access gateways and the cell-specific parameter is received via backbone network connected said access gateways and transmitted to the UE via a radio base station controlling the UE.
32. A network node of a wireless communication network, wherein the network node is adapted to serve at least one cell and to wirelessly control at least one User Equipment, UE, located in one of the at least one cell, comprising:
means for transmitting, prior to handover of a UE from the network node to a further network node, a cell-specific parameter associated with a cell served by the network node to the further network node controlling the UE to be handed over to said network node, wherein the cell-specific parameter comprises information related to a required additional maximum power reduction of a transmitter of a UE controlled by said further network node such that the required additional maximum power reduction of the transmitter of the UE controlled by said network node allows for the UE to meet an out of band emission requirement at handover, and such that the further network node can transmit the received cell-specific parameter to the UE controlled by the further network node and that the UE can use the cell-specific parameter when being handed over to the further network node.
33. The network node according to claim 32 , wherein the cell-specific parameter is transmitted together with handover related parameters.
34. The network node according to claim 32 , wherein the network node is a radio base station.
35. The network node according to claim 32 , wherein the further network node is a radio base station.
36. The network node according to claim 35 , wherein the cell-specific parameter is transmitted to the further radio base station over an X2 interface.
37. The network node according to claim 32 , wherein the network node is a gateway wherein the cell specific parameter is transmitted to the network node controlling the UE via a further gateway.