Interference reduction for reference symbols in URLLC/eMBB multiplexing
Interference for reference symbols in URLLC/eMBB multiplexing may be reduced. URLLC and/or eMBB reference signal (RS) interference may be reduced regardless whether the URLLC and eMBB reference signals and data are multiplexed and superimposed using the same numerology or different numerologies and/or regardless whether the URLLC and eMBB reference signals may be aligned or misaligned (e.g., may or may not use a common resource). An URLLC transmission may preempt an eMBB transmission. For the URLLC and eMBB transmissions using a same numerology, a RS reuse indication may be used. The RS reuse indication may indicate whether a RS in the preempted portion of the eMBB transmission may be reused. A channel estimation function set may be estimated, and channel estimation may be performed using the determined channel estimation function set. The eMBB transmission and the URLLC transmission may be decoded based on the performed channel estimation.
1. A wireless transmit/receive unit (WTRU) comprising:
a processor configured to:
receive a first transmission using a first numerology from a network entity;
receive an indication associated with the first transmission, the indication comprising a preemption indication and a reference signal (RS) reuse indication, wherein the preemption indication indicates that a portion of the first transmission is preempted and the RS reuse indication indicates whether a RS in the preempted portion of the first transmission can be reused;
determine whether the RS in the preempted portion of the first transmission can be reused based on the RS reuse indication; and
decode the first transmission, wherein the first transmission is decoded:
using the RS associated with the first transmission including the preemption portion on a condition that the RS reuse indication indicates a first value; and
using the RS associated with the first transmission excluding the preemption portion on a condition that the RS reuse indication indicates a second value.
2. The WTRU of claim 1 , wherein on a condition that the RS reuse indication indicates that the RS in the preempted portion of the first transmission cannot be reused, the processor is configured to ignore the RS for channel estimation.
3. The WTRU of claim 1 , wherein the first transmission is received in a first slot and the indication is received in a second slot.
4. The WTRU of claim 3 , wherein the second slot is a next slot after the first slot.
5. The WTRU of claim 3 , wherein the indication is received in a downlink control information (DCI) associated with the second slot.
6. The WTRU of claim 1 , wherein the processor is configured to:
based on a determination that the RS reuse indication indicating that the RS in the preempted portion of the first transmission can be reused, determine a channel estimation function set associated with a level of reuse indicated by the RS reuse indication; and
perform a channel estimation using the determined channel estimation function set.
7. The WTRU of claim 6 , wherein the level of reuse is a first level of reuse or a second level of reuse, and the first level of reuse is associated with a first channel estimation function set and the second level of reuse is associated with a second channel estimation function set.
8. The WTRU of claim 7 , wherein the first channel estimation function set comprises a path-loss estimation (PLEST), and the second channel estimation function set comprises the PLEST and a Doppler-timing estimation (DEST).
9. The WTRU of claim 1 , wherein the first transmission comprises an enhanced mobile broadband (eMBB) transmission and a second transmission comprises an ultra-reliable low-latency communication (URLLC) transmission.
10. The WTRU of claim 1 , wherein a second transmission is superposed in the first transmission using a same numerology.
11. The WTRU of claim 1 , wherein the preemption indication indicates that the portion of the first transmission is preempted by a second transmission.
12. A method comprising:
receiving a first transmission using a first numerology from a network entity;
receiving an indication associated with the first transmission, the indication comprising a preemption indication and a reference signal (RS) reuse indication, wherein the preemption indication indicates that a portion of the first transmission is preempted and the RS reuse indication indicates whether a RS in the preempted portion of the first transmission can be reused;
determining whether the RS in the preempted portion of the first transmission can be reused based on the RS reuse indication; and
decoding the first transmission, wherein the first transmission is decoded:
using the RS associated with the first transmission including the preemption portion on a condition that the RS reuse indication indicates a first value; and
using the RS associated with the first transmission excluding the preemption portion on a condition that the RS reuse indication indicates a second value.
13. The method of claim 12 , wherein on a condition that the RS reuse indication indicates that the RS in the preempted portion of the first transmission cannot be reused, ignoring the RS for channel estimation.
14. The method of claim 12 , wherein the first transmission is received in a first slot and the indication is received in a second slot.
15. The method of claim 14 , wherein the second slot is a next slot after the first slot.
16. The method of claim 14 , wherein the indication is received in a downlink control information (DCI) associated with the second slot.
17. The method of claim 12 , comprising:
based on a determination that the RS reuse indication indicating that the RS in the preempted portion of the first transmission can be reused, determining a channel estimation function set associated with a level of reuse indicated by the RS reuse indication; and
performing channel estimation using the determined channel estimation function set.
18. The method of claim 17 , wherein the level of reuse is a first level of reuse or a second level of reuse, and the first level of reuse is associated with a first channel estimation function set and the second level of reuse is associated with a second channel estimation function set.
19. The method of claim 18 , wherein the first channel estimation function set comprises a path-loss estimation (PLEST), and the second channel estimation function set comprises the PLEST and a Doppler-timing estimation (DEST).
20. The method of claim 12 , wherein the first transmission comprises an enhanced mobile broadband (eMBB) transmission and a second transmission comprises an ultra-reliable low-latency communication (URLLC) transmission.