Integrated access and backhaul associated with NR
Random access may be provided for integrated access and backhaul (IAB) for New Radio (NR). A wireless transmit/receive unit may send (e.g., to a gNB) a preamble in a random access occasion (RO). One or more of the preamble or an RO resource partition of the RO may indicate a node type of the WTRU. The WTRU may receive (e.g., from the gNB) a physical downlink control channel (PDCCH) that indicates (e.g., includes) one or more random access responses (RARs). The WTRU may determine that the PDCCH indicates a WTRU RAR and an integrated access and backhaul (IAB) node RAR. If the sent node type is a WTRU node type, the WTRU may receive (e.g., from the gNB) the WTRU RAR at a first time and frequency location indicated by the PDCCH.
1. A wireless transmit/receive unit (WTRU), the WTRU comprising:
a memory; and
a processor, the processor configured to:
send a preamble in a random access occasion (RO), wherein one or more of the preamble and an RO resource partition of the RO indicate a node type of the WTRU;
receive a physical downlink control channel (PDCCH) transmission that indicates a first scheduling information for a WTRU random access response (RAR) and a second scheduling information for an integrated access and backhaul (IAB) RAR;
determine, using the first scheduling information and the second scheduling information, a power information that indicates that the IAB RAR is associated with a higher level of transmit power than the WTRU RAR; and
receive the WTRU RAR using the first scheduling information and the power information.
2. The WTRU of claim 1 , wherein the processor is further configured to:
receive, the IAB RAR using the second scheduling information and the power information.
3. The WTRU of claim 1 , wherein the RO resource partition comprises one or more of a first RO resource partition that indicates a WTRU node type and a second RO resource partition that indicates an IAB node type.
4. The WTRU of claim 1 , wherein a combination of the preamble and the RO resource partition is used to indicate the node type of the WTRU.
5. The WTRU of claim 1 , wherein the WTRU RAR is received at a lower transmit power than the IAB RAR.
6. The WTRU of claim 2 , wherein the first scheduling information is associated with a a first random access radio network temporary identifier (RA-RNTI) and the second scheduling information is associated with a second RA-RNTI.
7. The WTRU of claim 6 , wherein the PDCCH transmission further indicates the first RA-RNTI and the second RA-RNTI.
8. A method performed by a wireless transmit/receive unit (WTRU), the method comprising:
sending, by the WTRU, a preamble in a random access occasion (RO), wherein one or more of the preamble or an RO resource partition of the RO indicate a node type of the WTRU;
receiving, by the WTRU, a physical downlink control channel (PDCCH) transmission that indicates a first scheduling information for a WTRU random access response (RAR) and a second scheduling information for an integrated access and backhaul (IAB) RAR;
determining, by the WTRU, using the first scheduling information and the second scheduling information, a power information that indicates that the IAB RAR is associated with a higher level of transmit power than the WTRU RAR; and
receiving, by the WTRU, the WTRU RAR using the first scheduling information and the power information.
9. The method of claim 8 , wherein the method further comprises receiving, by the WTRU, the IAB RAR using the second scheduling information and the power information.
10. The method of claim 8 , wherein the RO resource partition comprises one or more of a first RO resource partition that indicates a WTRU node type and a second RO resource partition that indicates an IAB node type.
11. The method of claim 8 , wherein the WTRU RAR is received at a lower transmit power than the IAB RAR.
12. The method of claim 9 , wherein the first scheduling information is associated with a a first random access radio network temporary identifier (RA-RNTI) and the second scheduling information is associated with a second RA-RNTI.
13. The method of claim 12 , wherein the PDCCH transmission further indicates the first RA-RNTI and the second RA-RNTI.