HANDLING DOWNLINK SEMI-PERSISTENT SCHEDULING RETRANSMISSION IN WIRELESS NETWORKS
During discontinue reception (DRX) operation of a mobile terminal of a wireless communications network, methods to ensure that user equipment is in an awake mode when a network node sends a scheduling grant on the physical downlink control channel (PDCCH). Dynamic scheduling (DS) and semi-persistent scheduling (SPS) grants may appear on PDCCH only once. One method defines every received downlink (DL) semi-persistent scheduling (SPS) signal in a subframe as active time in a configured DRX cycle and includes in said defining active time any occurrence of a DL assignment being configured for the subframe. A second method receives an indication of a downlink transmission or a configured downlink assignment configured for the current PDCCH subframe, starts a Hybrid Automatic Repeat request (HARQ) Round Trip Timer (RTT) whether UE is in active time or not, and stops a drx-RetransmissionTimer for the corresponding HARQ process whether UE is in active time or not.
1 - 5 . (canceled)
6 . A method comprising:
receiving an indication of a downlink transmission or a configured downlink assignment configured for the current PDCCH subframe;
starting a Hybrid Automatic Repeat request (HARQ) Round Trip Timer (RTT) whether UE is in active time or not; and
stopping a drx-Retransmission Timer for the corresponding HARQ process whether UE is in active time or not.
7 . The method of claim 6 , further comprising:
monitoring a Physical Downlink Control Channel (PDCCH) subframe when during active time the PDCCH subframe is not required for uplink transmission for half-duplex frequency division duplex (FFD) operation and is not part of a configured measurement gap;
receiving an indication of a new transmission, whether uplink or downlink; and
starting or restarting drx-InactivityTimer.
8 - 12 . (canceled)
13 . An apparatus comprising at least a processor, a memory in communication with said processor and having computer coded instructions stored therein, said instructions when executed by the processor configured to cause the apparatus to perform:
receiving an indication of a downlink transmission or a configured downlink assignment configured for the current PDCCH subframe;
starting a Hybrid Automatic Repeat request (HARQ) Round Trip Timer (RTT) whether UE is in active time or not; and
stopping a drx-Retransmission Timer for the corresponding HARQ process whether UE is in active time or not.
14 . The apparatus of claim 13 , further comprising instructions configured to cause the apparatus to perform:
monitoring a Physical Downlink Control Channel (PDCCH) subframe when during active time the PDCCH subframe is not required for uplink transmission for half-duplex frequency division duplex (FFD) operation and is not part of a configured measurement gap;
receiving an indication of a new transmission, whether uplink or downlink; and
starting or restarting drx-InactivityTimer.
15 - 19 . (canceled)
20 . A computer program product comprising a computer readable storage medium having computer coded instructions stored therein, said instructions when executed by the processor being configured to cause the apparatus to perform:
receiving an indication of a downlink transmission or a configured downlink assignment configured for the current PDCCH subframe;
starting a Hybrid Automatic Repeat request (HARQ) Round Trip Timer (RTT) whether UE is in active time or not; and
stopping a drx-RetransmissionTimer for the corresponding HARQ process whether UE is in active time or not.
21 . The computer program product of claim 20 , further comprising instructions configured to cause the apparatus to perform:
monitoring a Physical Downlink Control Channel (PDCCH) subframe when during active time the PDCCH subframe is not required for uplink transmission for half-duplex frequency division duplex (FFD) operation and is not part of a configured measurement gap;
receiving an indication of a new transmission, whether uplink or downlink; and
starting or restarting drx-InactivityTimer.
22 - 28 . (canceled)