Frequency-domain resource allocation for multi-source transmission
Embodiments include methods, by a user equipment (UE), for receiving physical data channel transmissions from a wireless network. Such methods include receiving, from the wireless network, configuration information including: a first indication of one or more frequency-domain resource allocations for respective corresponding one or more physical data channel transmissions by respective corresponding one or more sources configured by the wireless network, and one or more second indications of further characteristics of the physical data channel transmissions. Such methods also include, based on the second indications, determining the number of frequency-domain resource allocations indicated by the first indication. Such methods also include receiving, from the wireless network, the determined number of physical data channel transmissions based on the respective indicated frequency-domain resource allocations. Other embodiments include complementary methods performed by a wireless network, and UEs and wireless networks configured to perform such methods.
1. A method for a user equipment (UE) to receive physical data channel transmissions from a wireless network, the method comprising:
receiving, from the wireless network, configuration information including:
a first indication of one or more frequency-domain resource allocations for respective corresponding one or more physical data channel transmissions by respective corresponding one or more sources configured by the wireless network, and
one or more second indications of further characteristics of the physical data channel transmissions;
based on the second indications, determining the number of frequency-domain resource allocations indicated by the first indication; and
receiving, from the wireless network, the determined number of physical data channel transmissions based on the respective indicated frequency-domain resource allocations.
2. The method of claim 1 , wherein the configuration information is received via a downlink message having one or more of the following characteristics:
a single message;
received via a single physical downlink control channel (PDCCH); and
received via a downlink control information (DCI) scheduling grant.
3. The method of claim 1 , wherein determining the number of frequency-domain resource allocations is not based on the first indication.
4. The method of claim 1 , wherein:
the first and second indications are received in a single downlink control information (DCI) message; and
the second indications are included in a transmission configuration indicator (TCI) state field of the DCI message, the TCI state field identifying one or more TCI states.
5. The method of claim 4 , wherein:
the frequency domain resource allocations are non-overlapping; and
each non-overlapping frequency domain resource allocation is associated with a corresponding TCI state indicated by the second indications.
6. The method of claim 4 , wherein:
each TCI state, indicated by the second indication, includes one or more source reference signal (RS) pairs;
each source RS pair has a corresponding pair of quasi-colocation (QCL) relations with antenna ports for demodulation reference signals (DM-RS);
the number of frequency-domain resource allocations indicated by the first indication are determined based on one or more of the following:
the number of TCI states indicated by the second indications; and
the number of pairs of QCL relations included in the TCI states indicated by the second indications.
7. The method of claim 6 , wherein:
the configuration information also includes a third indication of a plurality of the antenna ports for DM-RS; and
the indicated plurality of antenna ports are associated with all frequency domain resource allocations indicated by the first indication.
8. The method of claim 6 , wherein:
the one or more TCI states, indicated by the second indication, correspond to a code-division multiplexing, CDM, group that is associated with each of the physical data channel transmissions; and
each physical data channel transmission is received in association with DM-RS that have antenna ports with QCL relations included in the corresponding TCI state.
9. The method of claim 6 , wherein the respective sources configured by the wireless network correspond to one of the following:
the respective TCI states indicated by the second indications; or
the respective pairs of QCL relationships included in the TCI states indicated by the second indications.
10. The method of claim 1 , further comprising receiving, from the wireless network, a higher-layer control message including one or more further characteristics of the physical data channel transmissions, wherein determining the number of frequency-domain resource allocations identified by the first indication is further based on the one or more further characteristics.
11. The method of claim 10 , wherein:
the higher-layer control message includes a plurality of transmission configuration indicator (TCI) states; and
the second indications include an indication of one or more of the TCI states included in the higher-layer control message.
12. The method of claim 1 , wherein:
the method further comprises, based on the first indication and the determined number, determining one or more resource blocks within the one or more frequency domain allocations; and
receiving the determined number of physical data channel transmission is based on the determined resource blocks.
13. A method for a wireless network to perform physical data channel transmissions to a user equipment (UE), the method comprising:
transmitting, to the UE, configuration information including:
a first indication of one or more frequency-domain resource allocations for respective corresponding one or more physical data channel transmissions by respective corresponding one or more sources configured by the wireless network, and
one or more second indications of further characteristics of the physical data channel transmissions, wherein the number of frequency-domain resource allocations, indicated by the first indication, can be determined based on the one or more second indications; and
transmitting, to the UE, the physical data channel transmissions based on the respective indicated frequency-domain resource allocations and on the indicated further characteristics.
14. The method of claim 13 , wherein the configuration information is transmitted via a downlink message having one or more of the following characteristics:
a single message;
received via a single physical downlink control channel (PDCCH); and
received via a downlink control information (DCI) scheduling grant.
15. The method of claim 13 , wherein the number of frequency-domain resource allocations, indicated by the first indication, can be determined based on the one or more second indications without reference to the first indication.
16. The method of claim 13 , wherein:
the first and second indications are transmitted in a single downlink control information (DCI) message; and
the second indications are included in a transmission configuration indicator (TCI) state field of the DCI message, the TCI state field identifying one or more TCI states.
17. The method of claim 16 , wherein:
the frequency domain resource allocations are non-overlapping; and
each non-overlapping frequency domain resource allocation is associated with a corresponding TCI state indicated by the second indications.
18. The method of claim 16 , wherein:
each TCI state, indicated by the second indication, includes one or more source reference signal (RS) pairs;
each source RS pair has a corresponding pair of quasi-colocation (QCL) relations with antenna ports for demodulation reference signals (DM-RS);
the number of frequency-domain resource allocations indicated by the first indication can be determined based on one or more of the following:
the number of TCI states indicated by the second indications; and
the number of pairs of QCL relations included in the TCI states indicated by the second indications.
19. The method of claim 18 , wherein:
the configuration information also includes a third indication of a plurality of the antenna ports for DM-RS; and
the indicated plurality of antenna ports are associated with all frequency domain resource allocations indicated by the first indication.
20. The method of claim 18 , wherein:
the one or more TCI states, indicated by the second indication, correspond to a code-division multiplexing (CDM) group that is associated with each of the physical data channel transmissions; and
each physical data channel transmission is transmitted in association with DMRS that have antenna ports with QCL relations included in the corresponding TCI state.
21. The method of claim 18 , wherein the respective sources in the wireless network correspond to one of the following:
the respective TCI states indicated by the second indications; or
the respective pairs of QCL relationships included in the TCI states indicated by the second indications.
22. The method of claim 13 , further comprising transmitting, to the UE, a higher-layer control message including one or more further characteristics of the physical data channel transmissions, wherein the number of frequency-domain resource allocations identified by the first indication is further based on the one or more further characteristics.
23. The method of claim 22 , wherein:
the higher-layer control message includes a plurality of transmission configuration indicator (TCI) states; and
the second indications include an indication of one or more of the TCI states included in the higher-layer control message.
24. A user equipment (UE) configured to receive physical data channel transmissions from a wireless network, the UE comprising:
radio transceiver circuitry configured to communicate with a plurality of nodes in the wireless network; and
processing circuitry operatively coupled to the radio transceiver circuitry, whereby the processing circuitry and the radio transceiver circuitry are configured to perform operations corresponding to the method of claim 1 .
25. A non-transitory, computer-readable medium storing computer-executable instructions that, when executed by processing circuitry of a user equipment (UE) configured to receive physical data channel transmissions from a wireless network, configure the UE to perform operations corresponding to the method of claim 1 .
26. A wireless network comprising one or more nodes, the wireless network being configured to perform physical data channel transmissions to a user equipment (UE), the one or more nodes comprising:
radio network interface circuitry configured to communicate with the UE; and
processing circuitry operatively coupled to the radio network interface circuitry, whereby the processing circuitry and the radio network interface circuitry are configured to perform operations corresponding to the method of claim 13 .
27. A non-transitory, computer-readable medium storing computer-executable instructions that, when executed by processing circuitry of one or more nodes in a wireless network configured to perform physical data channel transmissions to a user equipment (UE), configure the one or more nodes to perform operations corresponding to the method of claim 13 .