Method and apparatus for decoding a PDSCH using pre-emption
At least two PDSCH resource allocations can be received. Different PDSCH resource allocations of the at least two PDSCH resource allocations can be associated with different spatial filters for a UE. A pre-emption indication that indicates pre-empted resources can be received. A determination can be made as to whether the pre-emption indication is applicable to a first PDSCH resource allocation, a second PDSCH resource allocation, both PDSCH resource allocations, or no PDSCH resource allocation of the at least two PDSCH resource allocations. A first PDSCH corresponding to the first PDSCH resource allocation can be decoded based on no transmission being present for the UE in the pre-empted resources in response to determining the pre-emption indication is applicable to the first PDSCH resource allocation and not applicable to the second PDSCH resource allocation.
1. A method at a user equipment, the method comprising:
receiving at least two physical downlink shared channel resource allocations, where different physical downlink shared channel resource allocations of the at least two physical downlink shared channel resource allocations are associated with different spatial filters for the user equipment;
receiving a pre-emption indication that indicates pre-empted resources;
determining whether the pre-emption indication is applicable to a first physical downlink shared channel resource allocation, a second physical downlink shared channel resource allocation, both the first and the second physical downlink shared channel resource allocations, or no physical downlink shared channel resource allocation of the at least two physical downlink shared channel resource allocations; and
decoding a first physical downlink shared channel corresponding to the first physical downlink shared channel resource allocation based on no transmission being present for the user equipment in the pre-empted resources in response to determining the pre-emption indication is applicable to the first physical downlink shared channel resource allocation,
wherein the pre-emption indication is a first pre-emption indication with a first bit-field size,
wherein the first pre-emption indication is indicated in a downlink control information containing a second pre-emption indication with a second bit-field size different than the first bit-field size, and
wherein a size of the downlink control information is a multiple of a least common multiple of the first bit-field size and the second bit-field size.
2. The method according to claim 1 , wherein the first physical downlink shared channel resource allocation allocates same resources as the second physical downlink shared channel resource allocation.
3. The method according to claim 1 , wherein the first physical downlink shared channel comprises at least two spatial layers and the pre-emption indication determined to be applicable to the first physical downlink shared channel resource allocation indicates no transmission is present for the user equipment in resources indicated for a proper subset of the at least two spatial layers.
4. The method according to claim 1 , wherein determining whether the pre-emption indication is applicable comprises determining whether the pre-emption indication is applicable based on a field in the pre-emption indication.
5. The method according to claim 4 , wherein the field contains at least one selected from a transmission configuration information-state and a synchronization signal block index.
6. The method according to claim 4 , wherein determining whether the pre-emption indication is applicable comprises determining whether the pre-emption indication is applicable to the first physical downlink shared channel resource allocation based on the field in the pre-emption indication.
7. The method according to claim 1 , wherein determining whether the pre-emption indication is applicable comprises determining whether the pre-emption indication is applicable based on the search space the pre-emption indication is received.
8. The method according to claim 1 , wherein determining whether the pre-emption indication is applicable comprises determining whether the pre-emption indication is applicable based on the RNTI associated with the pre-emption indication.
9. The method according to claim 1 , further comprising decoding a second physical downlink shared channel corresponding to the second physical downlink shared channel resource allocation based on the pre-emption indication not being applicable to the second physical downlink shared channel.
10. The method according to claim 1 , wherein different physical downlink shared channel resource allocations are associated with different spatial filters for the user equipment based on the first physical downlink shared channel and the second physical downlink shared channel being quasi co-located with different reference signals.
11. The method according to claim 1 , wherein the at least two physical downlink shared channel resource allocations are received in at least one downlink control information.
12. The method according to claim 1 , further comprising determining the pre-emption indication is applicable to the first physical downlink shared channel resource allocation.
13. The method according to claim 1 ,
wherein the user equipment is configured with a first pre-emption configuration and a second pre-emption configuration,
wherein the method further comprises:
monitoring pre-emption indications associated with a first spatial filter of the different spatial filters according to the first pre-emption configuration; and
monitoring pre-emption indications associated with a second spatial filter of the different spatial filters according to the second pre-emption configuration, and
wherein at least one of the first pre-emption configuration and the second pre-emption configuration includes at least one selected from a pre-emption position index in the downlink control information, a monitoring periodicity of a pre-emption indication, a radio network temporary identifier value corresponding to the downlink control information, and a downlink control information payload size.
14. The method according to claim 1 , wherein pre-empted resources comprise at least one selected from resources to be punctured and resources to be rate matched around.
15. The method according to claim 1 ,
wherein receiving the pre-emption indication comprises receiving the pre-emption indication comprising a first number of bits in a downlink control information payload,
wherein the method further comprises receiving a higher layer parameter indicating a starting position of the pre-emption indication, where a higher layer is higher than a physical layer, and
wherein the indicated starting position of the pre-emption indication in the downlink control information payload is in multiples of a second number, where the second number is less than the first number, and where the second number is a second largest divisor of the first number or the second number is a greatest common divisor of 14 and the first number.
16. The method according to claim 1 ,
wherein the user equipment is configured with first pre-emption configuration parameters, and
wherein the method further comprises determining second pre-emption configuration parameters based on the first pre-emption configuration parameters.
17. An apparatus comprising:
a transceiver that
receives at least two physical downlink shared channel resource allocations, where different physical downlink shared channel resource allocations of the at least two physical downlink shared channel resource allocations are associated with different spatial filters for the apparatus, and
receives a pre-emption indication that indicates pre-empted resources; and
a controller coupled to the transceiver, where the controller
determines whether the pre-emption indication is applicable to a first physical downlink shared channel resource allocation, a second physical downlink shared channel resource allocation, both physical downlink shared channel resource allocations, or no physical downlink shared channel resource allocation of the at least two physical downlink shared channel resource allocations, and
decodes a first physical downlink shared channel corresponding to the first physical downlink shared channel resource allocation based on no transmission being present for the apparatus in the pre-empted resources in response to determining the pre-emption indication is applicable to the first physical downlink shared channel resource allocation,
wherein the pre-emption indication is a first pre-emption indication with a first bit-field size,
wherein the first pre-emption indication is indicated in a downlink control information containing a second pre-emption indication with a second bit-field size different than the first bit-field size, and
wherein a size of the downlink control information is a multiple of a least common multiple of the first bit-field size and the second bit-field size.
18. The apparatus according to claim 17 , wherein the first physical downlink shared channel resource allocation allocates same resources as the second physical downlink shared channel resource allocation.
19. The apparatus according to claim 17 , wherein the first physical downlink shared channel comprises at least two spatial layers and the pre-emption indication applicable to the first physical downlink shared channel resource allocation indicates no transmission is present for the apparatus in resources indicated for a proper subset of the at least two spatial layers.
20. The apparatus according to claim 17 , wherein the controller determines whether the pre-emption indication is applicable based on a field in the pre-emption indication.