Method and apparatus for performing and reporting measurements by user equipment configured with multiple carriers in mobile communication systems
摘要
說明書
The MTC device receives its data repeatedly transmitted with the start of the drx-inactivity timer. When the repetition transmission of data is ended (2515), UE decodes the data (2525). The drx-inactivity timer is so long that the MTC device can receive all data repeatedly transmitted. When the MTC device has successfully decoded the data, it transmits the ACK feedback (2535) to the ENB. Otherwise, the MTC device starts an RTT timer (2530). In addition, the MTC device transmits the NACK feedback information (2535) to the ENB. According to an embodiment of the present disclosure, the RTT timer can be started after the repetition reception of data.
The RTT timer of legacy DRX has eight sub-frames (8 ms) in FDD and k+4 sub-frames in TDD. k denotes a time interval between times transmitting HARQ feedbacks related to the downlink transmission. ACK/NACK feedback needs to be re-transmitted in an extended service area mode. Therefore, the legacy RTT timer value is also increased. At least, the legacy RTT timer value needs to include the repetition transmission time interval of the feedback. When the RTT timer stops (2540), the drx-retransmission timer starts (2545). During the operation of the drx-retransmission timer, the MTC device needs to receive EPDCCH. Therefore, the starting point of the drx-retransmission needs to be identical with the starting point of the repletion period (2405) of the EPDCCH, and the period is a multiple of the repletion period of EPDCCH. Alternatively, the time interval of the drx-retransmission is greater than or equal to the repetition transmission interval of the EPDCCH.
