Method and apparatus for DCI format indication of multicast transmission
Embodiments of the present disclosure relate to multicast transmissions. According to some embodiments of the disclosure, a method may include: receiving a downlink control information (DCI) format for scheduling a physical downlink shared channel (PDSCH); determining, based on the DCI format, whether the PDSCH is scheduled for a group of UEs including the UE or specifically for the UE; and decoding the scheduled PDSCH.
1 . A user equipment (UE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
receive a downlink control information (DCI) format for scheduling a physical downlink shared channel (PDSCH), the DCI format indicating a hybrid automatic repeat request (HARQ) process number or a frequency resource for the scheduled PDSCH;
determine whether the PDSCH is scheduled for a group of UEs including the UE or specifically for the UE based on:
whether the HARQ process number is included in a set of HARQ process numbers associated with the group of UEs; or
whether the frequency resource is fully contained within a common frequency region associated with the group of UEs; and
decode the scheduled PDSCH.
2 . The UE of claim 1 , wherein the at least one processor is configured to cause the UE to:
receive radio resource control (RRC) signaling for configuring the set of HARQ process numbers for transmitting data to the group of UEs including the UE.
3 . The UE of claim 1 , wherein to determine, based on the DCI format, whether the PDSCH is scheduled for the group of UEs including the UE or specifically for the UE, the at least one processor is configured to cause the UE to:
determine, in response to the HARQ process number indicated by the DCI format being included in the set of HARQ process numbers, that the PDSCH is scheduled for the group of UEs including the UE; and
determine, in response to the HARQ process number indicated by the DCI format not being included in the set of HARQ process numbers, that the PDSCH is scheduled specifically for the UE.
4 . The UE of claim 1 , wherein the at least one processor is configured to cause the UE to:
receive radio resource control (RRC) signaling for configuring the common frequency region for the group of UEs including the UE.
5 . The UE of claim 1 , wherein to determine whether the PDSCH is scheduled for the group of UEs including the UE or specifically for the UE, the at least one processor is configured to cause the UE to:
determine, in response to the frequency resource indicated by the DCI format being fully contained within the common frequency region, that the PDSCH is scheduled for the group of UEs including the UE; and
determine, in response to the frequency resource indicated by the DCI format being partly contained within or outside the common frequency region, that the PDSCH is scheduled specifically for the UE.
6 . The UE of claim 5 , wherein the at least one processor is configured to cause the UE to:
determine, in response to the PDSCH being scheduled for the group of UEs including the UE, a scrambling sequence for decoding the scheduled PDSCH based on a common radio network temporary identifier (RNTI) for the group of UEs; and
determine, in response to the PDSCH being scheduled specifically for the UE, the scrambling sequence based on an RNTI specific for the UE.
7 . The UE of claim 1 , wherein the DCI format indicates a transmission type of the scheduled PDSCH.
8 . The UE of claim 7 , wherein the transmission type indicated by the DCI format is selected from a set of transmission types including two or more of a unicast transmission type, a multicast transmission type, or a broadcast transmission type.
9 . The UE of claim 7 , wherein the at least one processor is configured to cause the UE to:
determine, in response to the transmission type indicated by the DCI format being a multicast or broadcast transmission type, a scrambling sequence for decoding the scheduled PDSCH based on a common radio network temporary identifier (RNTI) for the multicast or broadcast transmission type; and
determine, in response to the transmission type indicated by the DCI format being unicast transmission type, the scrambling sequence based on an RNTI specific for the UE.
10 . The UE of claim 1 , wherein the DCI format indicates a transmission scheme of the scheduled PDSCH.
11 . The UE of claim 10 , wherein the transmission scheme of the scheduled PDSCH is selected from a set of transmission schemes, and each of the set of transmission schemes is associated with a radio network temporary identifier (RNTI) for decoding an associated PDSCH.
12 . The UE of claim 10 , wherein the at least one processor is configured to cause the UE to:
determine a scrambling sequence for decoding the scheduled PDSCH based on a radio network temporary identifier (RNTI) associated with the transmission scheme indicated by the DCI format.
13 . A method performed by a user equipment (UE), the method comprising:
receiving a downlink control information (DCI) format for scheduling a physical downlink shared channel (PDSCH), the DCI format indicating a hybrid automatic repeat request (HARQ) process number or a frequency resource for the scheduled PDSCH;
determining whether the PDSCH is scheduled for a group of UEs including the UE or specifically for the UE based on:
whether the HARQ process number is included in a set of HARQ process numbers associated with the group of UEs; or
whether the frequency resource is fully contained within a common frequency region associated with the group of UEs; and
decoding the scheduled PDSCH.
14 . The method of claim 13 , further comprising:
receiving radio resource control (RRC) signaling for configuring the set of HARQ process numbers for transmitting data to the group of UEs including the UE.
15 . The method of claim 13 , wherein determining whether the PDSCH is scheduled for the group of UEs including the UE or specifically for the UE comprises:
determining, in response to the HARQ process number indicated by the DCI format being included in the set of HARQ process numbers, that the PDSCH is scheduled for the group of UEs including the UE; and
in response to the HARQ process number indicated by the DCI format not being included in the set of HARQ process numbers, determining that the PDSCH is scheduled specifically for the UE.
16 . The method of claim 13 , further comprising:
receiving radio resource control (RRC) signaling for configuring the common frequency region for the group of UEs including the UE.
17 . The method of claim 13 , wherein determining whether the PDSCH is scheduled for a group of UEs including the UE or specifically for the UE comprises:
determining, in response to the frequency resource indicated by the DCI format being fully contained within the common frequency region, that the PDSCH is scheduled for the group of UEs including the UE; and
determine, in response to the frequency resource indicated by the DCI format being partly contained within or outside the common frequency region, that the PDSCH is scheduled specifically for the UE.
18 . The method of claim 17 , further comprising:
determining, in response to the PDSCH being scheduled for the group of UEs including the UE, a scrambling sequence for decoding the scheduled PDSCH based on a common radio network temporary identifier (RNTI) for the group of UEs; and
determining, in response to the PDSCH being scheduled specifically for the UE, the scrambling sequence based on an RNTI specific for the UE.
19 . The method of claim 13 , further comprising:
determining, in response to a transmission type indicated by the DCI format being a multicast or broadcast transmission type, a scrambling sequence for decoding the scheduled PDSCH based on a common radio network temporary identifier (RNTI) for the multicast or broadcast transmission type; and
determining, in response to the transmission type indicated by the DCI format being unicast transmission type, the scrambling sequence based on an RNTI specific for the UE.
20 . A network entity for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the network entity to:
determine whether to transmit data to a first user equipment (UE) or to a group of UEs including the first UE based on:
a set of hybrid automatic repeat request (HARQ) process numbers associated with the group of UEs; or
a common frequency region associated with the group of UEs;
generate a downlink control information (DCI) format for scheduling a physical downlink shared channel (PDSCH), the DCI format indicating a HARQ process number or a frequency resource for the scheduled PDSCH; and
transmit the DCI format and the scheduled PDSCH to one or more of the first UE or the group of UEs including the first UE.