Communication method and apparatus

1 . A communication method carried out by a second node, the method comprising:

receiving configuration information provided by a donor base station node incorporating a central unit and distributed unit (CU-DU) pair, wherein the configuration information indicates time-frequency information of a system information block 1 (SIB1) of a distributed unit (DU) function of a first node that is a child integrated access and backhaul (IAB) node, and wherein the second node is a parent IAB node of the first node; and

determining, based on the time-frequency information of the SIB1 of the DU function of the first node, an unavailable resource of a mobile termination (MT) function of the first node,

wherein the configuration information comprises time-frequency information of a synchronization signal/physical broadcast channel (SS/PBCH) block, and

wherein the determining comprises:

determining, based on the time-frequency information of the SS/PBCH block of a DU of the first node, a time-frequency resource for sending the SIB1 by the DU of the first node; and

determining the time-frequency resource for sending the SIB1 by the DU of the first node as the unavailable resource of the MT function of the first node.

2 . The method according to claim 1 , wherein the time-frequency information of the SS/PBCH block comprises one or more of the following information:

a periodicity and an offset of the SS/PBCH block, an index of the SS/PBCH block in a half-frame, a subcarrier spacing of the SS/PBCH block, and frequency domain information of the SS/PBCH block.

3 . The method according to claim 1 , wherein the configuration information further comprises one or more of the following information:

information about a multiplexing pattern between the SS/PBCH block and the SIB1, frequency domain information of the SIB1, and a frequency domain offset of the SIB1.

4 . The method according to claim 1 , wherein the second node stores one or more tables, and each of the one or more tables records the following information:

an index, a multiplexing pattern between the SS/PBCH block and the SIB1, frequency domain information of the SIB1, and a frequency domain offset of the SIB1.

5 . The method according to claim 4 , further comprising:

obtaining, by the second node, a subcarrier spacing of the SIB1 and the subcarrier spacing of the SS/PBCH block;

determining a first table in the one or more tables based on the subcarrier spacing of the SIB1 and the subcarrier spacing of the SS/PBCH block;

receiving, by the second node, a first index, wherein the first index indicates a CORESET configuration occupied by a physical downlink control channel (PDCCH) of the SIB1; and

determining, in the first table based on the first index, the CORESET configuration occupied by the PDCCH of the SIB1.

6 . The method according to claim 1 , wherein the determining the unavailable resource of the MT function of the first node further comprises:

determining a time-frequency resource occupied by the SIB1 of the DU function of the first node as the unavailable resource of the MT function of the first node.

7 . The method according to claim 1 , wherein the configuration information is received by using an interface message F1-AP.

8 . A second node comprising:

a processor; and

a transceiver,

wherein the processor and transceiver are configured to cooperatively operate to carry out a communications method comprising:

receiving configuration information provided by a donor base station node incorporating a central unit and distributed unit (CU-DU) pair, wherein the configuration information indicates time-frequency information of a system information block 1 (SIB1) of a distributed unit (DU) function of a first node that is a child integrated access and backhaul (IAB) node, and wherein the second node is a parent IAB node of the first node; and

determining, based on the time-frequency information of the SIB1 of the DU function of the first node, an unavailable resource of a mobile termination (MT) function of the first node,

wherein the configuration information comprises time-frequency information of a synchronization signal/physical broadcast channel (SS/PBCH) block, and

wherein the determining comprises:

determining, based on the time-frequency information of the SS/PBCH block of a DU of the first node, a time-frequency resource for sending the SIB1 by the DU of the first node; and

determining the time-frequency resource for sending the SIB1 by the DU of the first node as the unavailable resource of the MT function of the first node.

9 . The node according to claim 8 , wherein the time domain information of the SS/PBCH block comprises a periodicity and an offset of the SS/PBCH block.

10 . The node according to claim 8 , wherein the configuration information further comprises one or more of the following information:

information about a multiplexing pattern between the SS/PBCH block and the SIB1, frequency domain information of the SIB1, and a frequency domain offset of the SIB1.

11 . The node according to claim 8 , further comprising a storage, configured to store one or more tables, and each of the one or more tables records the following information:

an index, a multiplexing pattern between the SS/PBCH block and the SIB1, frequency domain information of the SIB1, and a frequency domain offset of the SIB1.

12 . The node according to claim 8 , wherein the transceiver is further configured to cooperate with the processor to: obtain a subcarrier spacing of the SIB1 and a subcarrier spacing of the SS/PBCH block; and receive a first index, wherein the first index indicates a CORESET configuration occupied by a physical downlink control channel (PDCCH) of the SIB1; and

the processor is further configured to: determine a first table in the one or more tables based on the subcarrier spacing of the SIB1 and the subcarrier spacing of the SS/PBCH block; and

determine, in the first table based on the first index, the CORESET configuration occupied by the PDCCH of the SIB1.

13 . The node according to claim 8 , wherein the processor is configured to determine a time-frequency resource occupied by the SIB1 of the DU function of the first node as the unavailable resource of the MT function of the first node.

14 . The node according to claim 8 , wherein the transceiver is configured to cooperate with the processor to receive the configuration information by using an interface message F1-AP.

15 . A first node comprising:

a processor, configured to determine time-frequency information of a system information block 1 (SIB1) of a distributed unit (DU) function of child integrated access and backhaul (IAB) node; and

a transceiver, configured to cooperate with the processor to send configuration information to a second node,

wherein the configuration information indicates the time-frequency information of the SIB1,

wherein the first node is a donor base station node, and the second node is a parent IAB node of the child IAB node, and

wherein the donor base station node incorporates a central unit and distributed unit (CU-DU) pair,

wherein the second node, based on the time-frequency information of the SIB1 of the DU function of the first node, performs determining an unavailable resource of a mobile terminal (MT) function of the first node,

wherein the configuration information comprises time-frequency information of a synchronization signal/physical broadcast channel (SS/PBCH) block, and

wherein the determining comprises:

determining, based on the time-frequency information of the SS/PBCH block of a DU of the first node, a time-frequency resource for sending the SIB1 by the DU of the first node; and

determining the time-frequency resource for sending the SIB1 by the DU of the first node as the unavailable resource of the MT function of the first node.

16 . The first node according to claim 15 , wherein the time domain information of the SS/PBCH block comprises a periodicity and an offset of the SS/PBCH block.

17 . The first node according to claim 15 , wherein the configuration information further comprises one or more of the following information:

information about a multiplexing pattern between the SS/PBCH block and the SIB1, frequency domain information of the SIB1, and a frequency domain offset of the SIB1.