Section: A.17 Monitoring of RNReconfiguration
Content: The purpose of RNReconfiguration related procedure is to configure/reconfigure the RN subframe configuration and/or to update the system information relevant for the RN in RRC_CONNECTED. The system information and subframe configuration is very important for RN, but the RN does not need to apply the system information acquisition and change monitoring procedures, if configured with an RN subframe configuration. Upon change of any system information relevant to an RN, E-UTRAN provides the system information blocks containing the relevant system information to RNs with an RN subframe configuration via dedicated signalling using the RNReconfiguration message. This dedicated signalling replaces any stored system information acquired through the system information acquisition procedure. Because the RN is semi-duplex, to avoid the transmission conflict between access link (between UE and RN) and backhaul link (between RN and DeNB), the subframe of RN is semi-statically assigned (see TR 36.814) and the configuration information is included in the RNReconfiguration message. During the RN operation, failures of backhaul link will cause unsuccessful RN reconfiguration. In that case, RN will not get any response from DeNB. The defined performance counter will help to compute how many respose messages are missing. Depending on this result, operators could easily make network planning to consider fix or optimize the backhaul link quality.