Half duplex FDD WTRU with single oscillator
Half duplex (HD) frequency division duplexing (FDD) in a wireless transmit-receive unit (WTRU) using a single oscillator (SO) for uplink (UL) and downlink (DL), which may contribute to reduced costs of implementation. Approaches to the resolution of scheduling issues which may result from increased switching time versus implementations using separate oscillators are discussed, including indication of SO-HD-FDD capability, scheduling for collision avoidance, enhanced node-b (eNB) receiver implementations, link adaptation for missed detected physical downlink control and shared channels, collision handling, DL measurement, and burst based transmissions.
1. A method performed by a half-duplex single oscillator wireless transmit receive unit (HD-SO-WTRU) for processing subframes, the method comprising:
determining, based on a priority rule, a subframe to process from an uplink subframe for transmission to a base station and a scheduled downlink subframe for reception from the base station, wherein the uplink subframe and the scheduled downlink subframe collide with each other; and
processing, by the HD-SO-WTRU, the determined subframe;
wherein the priority rule indicates that downlink is a higher priority than uplink.
2. The method of claim 1 wherein the scheduled downlink subframe is a broadcast subframe.
3. The method of claim 1 wherein the uplink subframe includes a scheduling request.
4. The method of claim 3 , wherein the scheduled downlink subframe is scheduled by a machine type communication (MTC) physical downlink control channel (PDCCH) of the base station.
5. The method of claim 4 , wherein the scheduled downlink subframe is scheduled using a cell radio network temporary identifier (C-RNTI).
6. The method of claim 1 wherein the priority rule indicates that a periodic channel state information (CSI) reporting uplink transmission is a lower priority than a downlink reception.
7. The method of claim 1 wherein the priority rule indicates that a periodic sounding reference signal (SRS) uplink transmission to the base station is a lower priority than a downlink reception from the base station.
8. The method of claim 1 wherein the priority rule indicates that a pre-coding matrix indicator (PMI) or channel quality indicator (CQI) reporting uplink transmission to the base station is a lower priority than a downlink reception from the base station.
9. The method of claim 1 wherein the priority rule indicates that a downlink reception for a Channel State Information Reference Signal (CSI-RS) measurement from the base station is a higher priority than an uplink transmission to the base station.
10. A half-duplex single oscillator wireless transmit receive unit (HD-SO-WTRU) for processing subframes, comprising:
a processor configured to determine, based on a priority rule, a subframe to process from an uplink subframe for transmission to a base station and a scheduled downlink subframe for reception from the base station, wherein the uplink subframe and the scheduled downlink subframe collide with each other; and
a transceiver configured to process the determined subframe;
wherein the priority rule indicates that downlink is a higher priority than uplink.
11. The HD-SO-WTRU of claim 10 wherein the scheduled downlink subframe is a broadcast subframe.
12. The HD-SO-WTRU of claim 10 wherein the uplink subframe is an uplink scheduling request subframe.
13. The HD-SO-WTRU of claim 12 , wherein the scheduled downlink subframe is scheduled by a machine type communication (MTC) physical downlink control channel (PDCCH) of the base station.
14. The HD-SO-WTRU of claim 10 wherein the priority rule indicates that a periodic channel state information (CSI) reporting uplink transmission to the base station is a lower priority than a downlink reception from the base station.
15. The HD-SO-WTRU of claim 10 wherein the priority rule indicates that a periodic sounding reference signal (SRS) uplink transmission to the base station is a lower priority than a downlink reception from the base station.
16. The HD-SO-WTRU of claim 10 wherein the priority rule indicates that a pre-coding matrix indicator (PMI) or channel quality indicator (CQI) reporting uplink transmission to the base station is a lower priority than a downlink reception from the base station.