Patent ID: 8576766
Filing Date: 2013-11-05
Classification: H04B,H04W

Abstract:
1. A method of operating a relay node in a communication system wherein the relay node communicates with a communication system node via a first link and communicates with user equipment via a second link, the method comprising: using the second link to transmit first information to the user equipment, wherein the first information implicitly or explicitly informs the user equipment about a first uplink frequency resource to be used by the user equipment during a future time interval when communicating with the relay node; initiating receiving and decoding second information from the communication system node, wherein the second information implicitly or explicitly informs the relay node about a second uplink frequency resource to be used by the relay node when communicating with the communication system node during a time interval that at least partly overlaps with the future time interval; ascertaining whether the relay node transmitting by means of the second uplink frequency resource during the time interval that at least partly overlaps with the future time interval will interfere with the relay node receiving a transmission from the user equipment by means of the first uplink frequency resource; if it is ascertained that the relay node transmitting by means of the second uplink frequency resource during the time interval that at least partly overlaps with the future time interval will interfere with the relay node receiving the transmission from the user equipment, then selecting one of a plurality of interference averting measures based, at least in part, on what type of information is to be received from the user equipment by means of the first uplink frequency resource during the future time interval, and on what type of information is to be transmitted by the relay node to the communication system node by means of the second uplink frequency resource during the time interval that at least partly overlaps with the future time interval; and executing the selected one of the plurality of interference averting measures, wherein: a first one of the interference averting measures comprises refraining from transmitting at least a subset of information to the communication system node by means of the second uplink frequency resource during the time interval that at least partly overlaps with the future time interval; and a second one of the interference averting measures comprises transmitting the subset of information to the communication system node by means of the second uplink frequency resource during the time interval that at least partly overlaps with the future time interval, and performing one or more measures that are responsive to the relay node not being able to reliably receive information transmitted by the user equipment to the relay node by means of the first uplink frequency resource during the future time interval, wherein the first one of the interference averting measures comprises: refraining from transmitting data to the communication system node by means of the second uplink frequency resource during the time interval that at least partly overlaps with the future time interval; and during the time interval that at least partly overlaps with the future time interval, transmitting control information to the communication system node by means of an uplink frequency resource that is orthogonal to the first uplink frequency resource.