Optimized signaling in relay-enhanced access networks

1. A method comprising

receiving at least one signaling message concerning at least one relay node of a relay-enhanced access network over at least one predetermined signaling interface,

concentrating signaling at least by gathering relevant and/or non-redundant signaling information from the at least one signaling message and filtering out irrelevant or redundant signaling information from the at least one signaling message, wherein the concentrated signaling concerns a respective relay node, and

sending the concentrated signaling in a signaling message over the at least one predetermined signaling interface towards the respective relay node.

2. The method according to according to claim 1 , said concentrating comprising

determining a type of signaling of the at least one received signaling message,

gathering relevant and/or non-redundant signaling information for the determined type of signaling from relay nodes of the relay-enhanced access network, and

aggregating the gathered signaling information into the signaling message to be sent.

3. The method according to claim 2 , wherein, if the type of signaling is determined to relate to mobility of a user equipment in the relay-enhanced access network, the signaling information to be gathered and aggregated may include relevant and/or non-redundant address information of a relay node towards which the mobility of the user equipment is directed.

4. The method according to claim 2 , wherein, if the type of signaling is determined to relate to load balancing and/or interference coordination, the signaling information to be gathered and aggregated may include relevant and/or non-redundant load information and/or relevant and/or non-redundant information on resource partitioning between relay nodes of the relay-enhanced access network and/or relevant and/or non-redundant information on interference levels at relay nodes of the relay-enhanced access network.

5. The method according to claim 4 , said aggregating comprising weighting of gathered relevant and/or non-redundant signaling information from different relay nodes by weighting factors in accordance with the effect of the signaling information from respective relay nodes on the load balancing and/or interference coordination.

6. The method according to claim 5 , further comprising exchanging weighting factors between base stations of the relay-enhanced access network, and/or assigning appropriate weighting factors on the basis of load information and/or resource partitioning and/or interference levels in accordance with an automated neighbor relation.

7. The method according to claim 1 , further comprising

synchronizing receiving signaling messages from and/or sending signaling messages to relay nodes being controlled by a common donor base station.

8. The method according to claim 1 , wherein

the method is operable at or by a donor base station controlling said at least respective relay node, a non-donor base station not controlling said respective relay node, and/or a relay node gateway of said respective relay node, and said donor base station, non-donor base station and/or relay node gateway are part of an evolved radio access network in accordance with LTE and/or LTE-Advanced specifications, and/or

the at least one predetermined signaling interface is a X2 interface in accordance with LTE and/or LTE-Advanced specifications, and peers of the X2 interface may include said donor base station, said non-donor base station, said relay node gateway, said respective relay node, and/or one or more neighboring relay nodes of said respective relay node.

9. A computer program product including a non-transitory computer-readable medium comprising software code portions being arranged, when run on a processor of an apparatus, to perform the method according to claim 1 .

10. The method of claim 1 , wherein concentrating signaling further comprises gathering relevant and/or non-redundant signaling information from the at least one signaling message and filtering out irrelevant or redundant signaling information from the at least one signaling message, wherein the at least one signaling message comprises messages from multiple relay-nodes in the relay-enhanced access network.

11. The method of claim 1 , wherein concentrating signaling further comprises gathering relevant and/or non-redundant signaling information from the at least one signaling message and filtering out irrelevant or redundant signaling information from the at least one signaling message, wherein the at least one signaling message comprises messages from one or more relay-nodes and one or more base stations in the relay-enhanced access network.

12. An apparatus comprising

a receiver configured to receive at least one signaling message concerning at least one relay node of a relay-enhanced access network over at least one predetermined signaling interface,

a processor configured to concentrate signaling at least by gathering relevant and/or non-redundant signaling information from the at least one signaling message and filtering out irrelevant or redundant signaling information from the at least one signaling message, wherein the concentrated signaling concerns a respective relay node, and

a transmitter configured to send the concentrated signaling in a signaling message over the at least one predetermined signaling interface towards the respective relay node.

13. The apparatus according to according to claim 12 , said processor being configured to

determine a type of signaling of the at least one received signaling message,

gather relevant and/or non-redundant signaling information for the determined type of signaling from relay nodes of the relay-enhanced access network, and

aggregate the gathered signaling information into the signaling message to be sent.

14. The apparatus according to claim 13 , wherein, if the type of signaling is determined to relate to mobility of a user equipment in the relay-enhanced access network, the signaling information to be gathered and aggregated may include relevant and/or non-redundant address information of a relay node towards which the mobility of the user equipment is directed.

15. The apparatus according to claim 13 , wherein, if the type of signaling is determined to relate to load balancing and/or interference coordination, the signaling information to be gathered and aggregated may include relevant and/or non-redundant load information and/or relevant and/or non-redundant information on resource partitioning between relay nodes of the relay-enhanced access network and/or relevant and/or non-redundant information on interference levels at relay nodes of the relay-enhanced access network.

16. The apparatus according to claim 15 , said aggregating comprising weighting of gathered relevant and/or non-redundant signaling information from different relay nodes by weighting factors in accordance with the effect of the signaling information from respective relay nodes on the load balancing and/or interference coordination.

17. The apparatus according to claim 16 , said processor being further configured to control exchanging weighting factors between base stations of the relay-enhanced access network, and/or to assign appropriate weighting factors on the basis of load information and/or resource partitioning and/or interference levels in accordance with an automated neighbor relation.

18. The apparatus according to claim 12 , wherein the processor is further configured to synchronize receiving signaling messages from and/or sending signaling messages to relay nodes being controlled by a common donor base station.

19. The apparatus according to claim 12 , wherein

the apparatus is operable as or at a donor base station controlling said respective relay node, a non-donor base station not controlling said respective relay node, and/or a relay node gateway of said respective relay node, and said donor base station, non-donor base station and/or relay node gateway are part of an evolved radio access network in accordance with LTE and/or LTE-Advanced specifications, and/or

the at least one predetermined signaling interface is a X2 interface in accordance with LTE and/or LTE-Advanced specifications, and peers of the X2 interface may include said donor base station, said non-donor base station, said relay node gateway, said respective relay node, and/or one or more neighboring relay nodes of said respective relay node.

20. An apparatus, comprising:

at least one processor; and

at least one memory including computer program code,

the at least one memory and the computer program code configured, with the at least one processor, to cause the apparatus to perform at least the following:

receiving at least one signaling message concerning at least one relay node of a relay-enhanced access network over at least one predetermined signaling interface,

concentrating signaling at least by gathering relevant and/or non-redundant signaling information from the at least one signaling message and filtering out irrelevant or redundant signaling information from the at least one signaling message, wherein the concentrated signaling concerns a respective relay node, and

sending the concentrated signaling in a signaling message over the at least one predetermined signaling interface towards the respective relay node.