1. Method for wireless communication in a multi-user, multi-carrier communications system, using a multi-carrier resource space of at least two dimensions, of which one is frequency, said multi-carrier communications system allowing a data stream to be separated into a series of parallel data streams, each of which is modulated and simultaneously transmitted with a different frequency, comprising the step of:
allocating a first resource sub-space of entire said multi-carrier resource space for communication between a first node and a second node;
said first resource sub-space comprising resources of more than one carrier;
obtaining data associated with estimated radio conditions for communication between the first node and the second node;
allocating a second resource sub-space of entire said multi-carrier resource space for communication between the first node and a third node;
said second resource sub-space comprising resources of more than one carrier,
obtaining data associated with estimated radio conditions for communication between the first node and the third node;
providing access to the use of at least two pilot resource configurations, intended for different estimated node radio conditions,
whereby the first resource sub-space is associated a pilot resource configuration, being in agreement with pilot need for the estimated radio conditions for the second node and the second resource sub-space is associated a pilot resource configuration, being in agreement with pilot need for the estimated radio conditions for the third node; and
whereby at least one of the first resource sub-space and the second resource sub-space comprises a carrier having both pilot resources and data resources within said first resource sub-space or said second resource subspace, respectively;
transmitting to the second node information about a first power level used to transmit the pilot symbols in the pilot resources of the first resource sub-space; and
transmitting to the third node information about a second power level used to transmit the pilot symbols in the pilot resources of the second resource sub-space.', 'allocating a first resource sub-space of entire said multi-carrier resource space for communication between a first node and a second node;', 'said first resource sub-space comprising resources of more than one carrier;', 'obtaining data associated with estimated radio conditions for communication between the first node and the second node;', 'allocating a second resource sub-space of entire said multi-carrier resource space for communication between the first node and a third node;', 'said second resource sub-space comprising resources of more than one carrier,', 'obtaining data associated with estimated radio conditions for communication between the first node and the third node;', 'providing access to the use of at least two pilot resource configurations, intended for different estimated node radio conditions,', 'whereby the first resource sub-space is associated a pilot resource configuration, being in agreement with pilot need for the estimated radio conditions for the second node and the second resource sub-space is associated a pilot resource configuration, being in agreement with pilot need for the estimated radio conditions for the third node; and', 'whereby at least one of the first resource sub-space and the second resource sub-space comprises a carrier having both pilot resources and data resources within said first resource sub-space or said second resource subspace, respectively;', 'transmitting to the second node information about a first power level used to transmit the pilot symbols in the pilot resources of the first resource sub-space; and', 'transmitting to the third node information about a second power level used to transmit the pilot symbols in the pilot resources of the second resource sub-space.

2. Method according to claim 1, wherein the entire multi-carrier resource space being divided into parts having different pilot resource configurations;
whereby the steps of allocating comprises the steps of selecting the first resource sub-space and the second resource sub-space in respective parts having a pilot resource configuration suitable for the estimated radio conditions for the second node and the third node, respectively.', 'whereby the steps of allocating comprises the steps of selecting the first resource sub-space and the second resource sub-space in respective parts having a pilot resource configuration suitable for the estimated radio conditions for the second node and the third node, respectively.

3. Method according to claim 2, comprising the further steps of:
selecting, if no resource space part having a pilot resource configuration suitable for the estimated radio conditions for the second node or the third node, respectively, is available, an arbitrary first multi-carrier resource sub-space; and
adapting the pilot resource configuration within the first multi-carrier resource sub-space to suit the estimated radio conditions for the second node or the third node, respectively.', 'selecting, if no resource space part having a pilot resource configuration suitable for the estimated radio conditions for the second node or the third node, respectively, is available, an arbitrary first multi-carrier resource sub-space; and', 'adapting the pilot resource configuration within the first multi-carrier resource sub-space to suit the estimated radio conditions for the second node or the third node, respectively.

4. Method according to claim 1, further comprising the steps of:
selecting the first multi-carrier resource sub-space;
selecting the second multi-carrier resource sub-space; and
adapting the pilot resource configuration within the first and second multi-carrier resource sub-space to suit the estimated radio conditions for the second node and the third node, respectively, after the step of selecting.', 'selecting the first multi-carrier resource sub-space;', 'selecting the second multi-carrier resource sub-space; and', 'adapting the pilot resource configuration within the first and second multi-carrier resource sub-space to suit the estimated radio conditions for the second node and the third node, respectively, after the step of selecting.

5. Method according to claim 1, wherein the multi-carrier resource space has a time dimension.

6. Method according to claim 1, wherein the multi-carrier resource space has a code dimension.

7. Method according to claim 1, wherein the multi-carrier resource space has a spatial dimension.

8. Method according to claim 1, wherein the steps of obtaining in turn comprises the steps of estimating a set of estimated radio conditions.

9. Method according to claim 8, wherein the set of estimated radio conditions comprises at least one of Doppler conditions and coherence time conditions

10. Method according to claim 8, wherein the set of estimated radio conditions comprises at least one of delay spread conditions and coherence bandwidth conditions

11. Method according to claim 8, wherein the steps of estimating are based on position and/or velocity information concerning the second node and the third node, respectively

12. Method according to claim 1, wherein the steps of obtaining comprises the steps of receiving instructions and/or suggestions about preferred pilot resource configuration

13. Method according to claim 1, wherein the first node is selected from the group of:
user equipment;
mobile station;
base station;
access point; and
relay.', 'user equipment;', 'mobile station;', 'base station;', 'access point; and', 'relay

14. Method according to claim 1, wherein at least one of the second node and the third node is selected from the group of:
user equipment;
mobile station;
base station;
access point; and
relay.', 'user equipment;', 'mobile station;', 'base station;', 'access point; and', 'relay

15. Method according to claim 1, wherein resources of the first and second resource sub-spaces are allocated for downlink communication

16. Method according to claim 15, wherein the steps of obtaining data associated with estimated radio conditions for the second node and the third node is performed in a base station or access point.17. Method according to claim 16, further comprising the steps of transferring data characterising the first pilot resource configuration from the base station or access point to the second node and transferring data characterising the second pilot resource configuration from the base station or access point to the third node.18. Method according to claim 1, wherein resources of the first resource sub-space and the second resource sub-space are allocated for uplink communication.19. Method according to claim 18, wherein the steps of obtaining data associated with estimated radio conditions for the second node and for the third node are performed in a base station or access point, followed by the steps of transferring the data associated with estimated radio conditions for the second node to the second node and transferring the data associated with estimated radio conditions for the third node to the third node.

20. Method according to claim 18, wherein the step of obtaining data associated with estimated radio conditions for the second node is performed in the second node and the step of obtaining data associated with estimated radio conditions for the third node is performed in the third node.

21. Method according to claim 20, further comprising the steps of transferring data characterising the first pilot resource configuration from the
second node to the first node and transferring data characterising the second pilot resource configuration from the third node to the first node.', 'second node to the first node and transferring data characterising the second pilot resource configuration from the third node to the first node.

22. Method according to claim 1, further comprising the step of refraining from transmitting pilots in areas of the entire multi-carrier resource space not being allocated.

23. Method according to claim 1, wherein the wireless communication utilises OFDM.

24. Method according to claim 1, wherein the available at least two pilot resource configurations comprises different distribution patterns of pilot symbols in the multi-carrier resource space.

25. Method according to claim 24, wherein the available at least two pilot resource configurations further comprises transmission of pilot symbols with differing intensity.

26. The method of claim 1, where the first power level depends on the path loss to the second node, and the second power level depends on the path loss to the third node.

27. A first node of a multi-user, multi-carrier wireless communications system using a multi-carrier resource space of least two dimensions, of which one is frequency, said first node being arranged for handling a data stream separated into a series of parallel data streams, each of which being modulated and simultaneously transmitted with a different frequency, the first node comprising:
a downlink control unit for allocating a first resource sub-space of said multicarrier resource space for communication between the first node and a second node;', 'a downlink control unit for allocating a first resource sub-space of said multicarrier resource space for communication between the first node and a second node;', 'said first resource sub-space comprising resources of more than one carrier;
a radio conditions processor for obtaining data associated with estimated radio conditions for communication between the first node and the second node;
wherein the downlink control unit is further configured to allocate a second resource sub-space of said multi-carrier resource space for communication between the first node and a third node;', 'a radio conditions processor for obtaining data associated with estimated radio conditions for communication between the first node and the second node;', 'wherein the downlink control unit is further configured to allocate a second resource sub-space of said multi-carrier resource space for communication between the first node and a third node;', 'said second resource sub-space comprising resources of more than one carrier;
and wherein the radio conditions processor is further configured to obtain data associated with estimated radio conditions for communication between the first node and the third node; the first node further comprising:
a pilot manager for providing access to the use of at least two pilot resource configurations, intended for different estimated node radio conditions,', 'and wherein the radio conditions processor is further configured to obtain data associated with estimated radio conditions for communication between the first node and the third node; the first node further comprising:', 'a pilot manager for providing access to the use of at least two pilot resource configurations, intended for different estimated node radio conditions,', 'whereby the first resource sub-space comprises a pilot resource configuration suitable for the estimated radio conditions for the second node and the second resource sub-space comprises a pilot resource configuration suitable for the estimated radio conditions for the third node, and
whereby at least one of the first resource sub-space and the second resource sub-space comprises a carrier having both pilot resources and data resources within said first resource sub-space or said second resource subspace, respectively; and
means for transmitting to the second node information about a first power level used to transmit the pilot symbols in the pilot resources of the first resource sub-space; and
means for transmitting to the third node information about a second power level used to transmit the pilot symbols in the pilot resources of the second resource sub-space.', 'whereby at least one of the first resource sub-space and the second resource sub-space comprises a carrier having both pilot resources and data resources within said first resource sub-space or said second resource subspace, respectively; and', 'means for transmitting to the second node information about a first power level used to transmit the pilot symbols in the pilot resources of the first resource sub-space; and', 'means for transmitting to the third node information about a second power level used to transmit the pilot symbols in the pilot resources of the second resource sub-space.

28. The node according to claim 27, wherein the multi-carrier resource space is divided into parts having different pilot resource configurations; whereby the downlink control unit is arranged for selecting the first resource sub-space in a part having a pilot resource configuration suitable for the estimated radio conditions for the second node and for selecting the second resource sub-space in a part having a pilot resource configuration suitable for the estimated radio conditions for the third node.

29. The node according to claim 27, wherein the pilot manager is further configured to:
select the first multi-carrier resource sub-space;
select the second multi-carrier resource sub-space; and
adapt the pilot resource configuration within the first multi-carrier resource sub-space to suit the estimated radio conditions for the second node and for adapting the pilot resource configuration within the second multi-carrier resource sub-space to suit the estimated radio conditions for the third node.', 'select the first multi-carrier resource sub-space;', 'select the second multi-carrier resource sub-space; and', 'adapt the pilot resource configuration within the first multi-carrier resource sub-space to suit the estimated radio conditions for the second node and for adapting the pilot resource configuration within the second multi-carrier resource sub-space to suit the estimated radio conditions for the third node.

30. The node according to claim 27, wherein the pilot manager is further configured to transfer data characterizing the first pilot resource configuration from the first node to the second node and for transferring data characterizing the second pilot resource configuration from the first node to the third node.

31. The node according to claim 27, wherein the radio conditions processor in turn comprise a receiver for receiving instructions and/or suggestions about preferred pilot resource configuration from the second node and the third node.

33. The node according to claim 27, being a node selected from the group of:
user equipment;
mobile station;
base station;
access point; and
relay.', 'user equipment;', 'mobile station;', 'base station;', 'access point; and', 'relay.

34. The node according to claim 27, wherein the second node is selected from the group of:
user equipment; mobile station; base station;
access point; and relay.', 'user equipment; mobile station; base station;', 'access point; and relay.

35. The method of claim 27, where the first power level depends on the path loss to the second node, and the second power level depends on the path loss to the third node.

36. User equipment being arranged to handle connection to a multi-user, multi-carrier wireless communications system using a multi-carrier resource space of at least two dimensions, of which one is frequency, said user equipment being further arranged for handling a data stream to be separated into a series of parallel data streams, each of which is modulated and simultaneously transmitted with a different frequency, comprising:
a receiver configured for communication between the user equipment and a node utilising a first resource sub-space of entire said multi-carrier resource space;
said first resource sub-space comprising resources of more than one carrier;
said first resource sub-space comprising a first pilot resource configuration, out of a set of at least two different pilot resource configurations;
whereby the first pilot resource configuration is suitable for estimated radio conditions for the user equipment;
whereby the first resource sub-space comprises a carrier having both pilot resources and data resources within said first resource sub-space; and
means for receiving information about a power level used to transmit the pilot symbols in the pilot resources.', 'a receiver configured for communication between the user equipment and a node utilising a first resource sub-space of entire said multi-carrier resource space;', 'said first resource sub-space comprising resources of more than one carrier;', 'said first resource sub-space comprising a first pilot resource configuration, out of a set of at least two different pilot resource configurations;', 'whereby the first pilot resource configuration is suitable for estimated radio conditions for the user equipment;', 'whereby the first resource sub-space comprises a carrier having both pilot resources and data resources within said first resource sub-space; and', 'means for receiving information about a power level used to transmit the pilot symbols in the pilot resources.

37. User equipment according to claim 36, wherein the receiver is further configured to receive data indicating the first pilot resource configuration from the node, the user equipment further comprising:
a channel estimator, connected to the receiver;
whereby the channel estimator is arranged to perform channel estimation based on the received data indicating the first pilot resource configuration.', 'a channel estimator, connected to the receiver;', 'whereby the channel estimator is arranged to perform channel estimation based on the received data indicating the first pilot resource configuration.

38. User equipment according to claim 36, wherein the receiver is further configured to receive data from the node characterizing the first pilot resource configuration.

39. A method in a user equipment, the user equipment being arranged to handle connection to a multi-user, multi-carrier wireless communication system using a multi-carrier resource space of at least two dimensions, of which one is frequency, said user equipment being further arranged for handling a data stream to be separated into a series of parallel data streams, each of which is modulated and simultaneously transmitted with a different frequency, the user equipment being further arranged to communicate with the node utilizing a first resource sub-space of entire said multi-carrier resource space,
said first resource sub-space comprises resources of more than one carrier;
receiving data from the node, said data characterizing a first pilot resource configuration, out of a set of at least two different pilot resource configurations,
whereby the first pilot resource configuration is comprised in said first resource sub-space, and whereby the first pilot resource configuration is suitable for estimated radio conditions for the user equipment; and
receiving information about a power level used to transmit the pilot symbols in the pilot resources; and
performing channel estimation based on the received data characterizing the first pilot resource.', 'said first resource sub-space comprises resources of more than one carrier;', 'receiving data from the node, said data characterizing a first pilot resource configuration, out of a set of at least two different pilot resource configurations,', 'whereby the first pilot resource configuration is comprised in said first resource sub-space, and whereby the first pilot resource configuration is suitable for estimated radio conditions for the user equipment; and', 'receiving information about a power level used to transmit the pilot symbols in the pilot resources; and', 'performing channel estimation based on the received data characterizing the first pilot resource.']