A non-transitory computer-readable storage medium that stores instructions forexecution by processing circuitry of an enhanced node B (eNB), the processing circuitry configured to:
- decode X2 signalling received from a second eNB over an X2 interface;
- encode radio-resource control (RRC) signaling for transmission to an RRC connected user equipment (UE), the UE configured with a first cell group associated with the eNB,
- wherein the RRC signalling is encoded to configure the UE with a second cell group associated with the second eNB for dual connectivity operation in which the UE is scheduled toutilize radio resources of both the first and second cell groups, where the second cell group is indicated in by the X2 signalling;
- wherein the RRC signalling is further encoded to configure the UE with a first medium access control (MAC) configuration element, the first MAC configuration element to configure the UE for discontinuous reception (DRX) operations and buffer status report (BSR) operations for the first cell group, wherein the first MAC configuration element includes DRX configuration information and BSR configuration information for the first cell group,
- decode BSRs including scheduling requests received the UE on a physical uplink controlchannel (PUCCH) associated with the first cell group based on the BSR configuration information for the first cell group;
- encode a physical downlink control channel (PDCCH) associated with the first cell groupfor transmission to the UE during active times based on the DRX configuration information,
- wherein the first MAC configuration element is to configure the UE for the DRX and BSR operations within the first cell group independent of DRX and BSR operations configuredwithin the second cell group for the dual connectivity operation of the UE, and
- maintain an independent retransmit BSR-Timer and an independent periodic BSR-Timer for the first cell group, the independent retransmit BSR-Timer and the independent periodic BSR-Timer for the first cell group being independent of a retransmit BSR-Timer and a periodic BSR-Timer for the second cell group.