Methods for identifying resources of a new radio physical downlink control channel which have been preempted by ultra-reliable low latency communication
Methods and systems for detecting an enhanced massive mobile broadband (eMBB) physical downlink control channel (PDCCH) in the presence of for ultra-reliable low latency communication (URLLC) users are disclosed. A eMBB wireless transmit/receive unit (WTRU) may receive a eMBB control resource set (CORESET) configuration for a CORESET including a PDCCH preemption indicator. If PDCCH preemption is enabled based on the PDCCH preemption indicator, the eMBB WTRU may identify and remove preempted resource element groups (REGs) in the eMBB CORESET by comparing channel estimates for each REG bundle in the eMBB CORESET. The WTRU may perform channel estimation based on remaining REGs in the eMBB CORESET and detect the PDCCH by performing blind decoding, based on a received signal, on the remaining REGs in the eMBB CORESET.
1. A wireless transmit/receive unit (WTRU) configured to detect a physical downlink control channel (PDCCH) transmission, the WTRU comprising:
a receiver configured to receive configuration information for a control resource set (CORESET), the CORESET comprising a plurality of resource element groups (REGs) and the configuration information including a PDCCH preemption indicator that indicates that PDCCH preemption is enabled; and
a processor and the receiver configured to, based on the PDCCH preemption indicator indicating that PDCCH preemption is enabled,
detect the PDCCH transmission by performing blind decoding, based on a received signal, on REGs in the CORESET that are not preempted.
2. The WTRU of claim 1 further configured to identify preempted REGs from the CORESET and perform channel estimation on the REGs in the CORESET that are not preempted.
3. The WTRU of claim 1 further configured to identify preempted REGs from the CORESET by comparing channel estimates for each of a plurality of REG bundles in the CORESET.
4. The WTRU of claim 1 , wherein the detected PDCCH transmission is rate matched around the preempted REGs.
5. The WTRU of claim 1 , wherein the processor is further configured to check a cyclic redundancy code (CRC) of the received signal to determine if the PDCCH transmission was decoded without error.
6. The WTRU of claim 2 , wherein the CORESET is an enhanced mobile broadband (eMBB) CORESET, and the preempted REGs are shared with an ultra-reliable low latency communication (URLLC) PDCCH transmission.
7. The WTRU of claim 1 , wherein the eMBB CORESET overlaps, at least in part, with a ultra-reliable low latency communication (URLLC) CORESET.
8. The WTRU of claim 1 , wherein:
the receiver is further configured to receive second configuration information for a spare CORESET, the spare CORESET occupying at least one orthogonal frequency division multiplexing (OFDM) symbol that is different from the CORESET; and
on a condition that the blind decoding in the CORESET is unsuccessful, the processor is further configured to blind decode the PDCCH transmission in the spare CORESET or in a spare search space.
9. The WTRU of claim 1 configured as an eMBB WTRU.
10. A method for detecting a physical downlink control channel (PDCCH) transmission, performed by a wireless transmit/receive unit (WTRU), the method comprising:
receiving configuration information for a control resource set (CORESET), the CORESET comprising a plurality of resource element groups (REGs) and the configuration information including a PDCCH preemption indicator that indicates that PDCCH preemption is enabled; and
based on the PDCCH preemption indicator indicating that PDCCH preemption is enabled,
detecting the PDCCH transmission by performing blind decoding, based on a received signal, on REGs in the CORESET that are not preempted.
11. The method of claim 10 further comprising identifying preempted REGs from the CORESET and performing channel estimation on the REGs in the CORESET that are not preempted.
12. The method of claim 10 further comprising identifying preempted REGs from the CORESET by comparing channel estimates for each of a plurality of REG bundles in the CORESET.
13. The method of claim 10 , wherein the detected PDCCH transmission is rate matched around the preempted REGs.
14. The method of claim 10 , further comprising:
checking a cyclic redundancy code (CRC) of the received signal to determine if the PDCCH transmission was decoded without error.
15. The method of claim 11 , wherein the CORESET is an enhanced mobile broadband (eMBB) CORESET, and the preempted REGs are shared with an ultra-reliable low latency communication (URLLC) PDCCH transmission.
16. The method of claim 15 , wherein the eMBB CORESET overlaps, at least in part, with a ultra-reliable low latency communication (URLLC) CORESET.
17. The method of claim 10 , further comprising:
receiving second configuration information for a spare CORESET, the spare CORESET occupying at least one orthogonal frequency division multiplexing (OFDM) symbol that is different from the CORESET; and
on a condition that the blind decoding in the CORESET is unsuccessful, blind decoding the PDCCH transmission in the spare CORESET or in a spare search space.
18. The method of claim 10 , wherein the WTRU is configured as an eMBB WTRU.