Communication method and communication apparatus
A communication method and a communication apparatus are disclosed. The communication method includes: An integrated access and backhaul (IAB) node receives first configuration information from a source donor base station, where the first configuration information includes N pieces of configuration information of a mobile terminal (MT) and N pieces of configuration information of a distributed unit (DU) that are configured by N target donor base stations for the IAB node; and the DU of the IAB node uses one piece of configuration information in the N pieces of configuration information of the DU when the MT of the IAB node satisfies a specific condition, where N is greater than or equal to 1, the MT is configured to communicate with a parent node of the IAB node, the source donor base station, or the target donor base station, and the DU is configured to communicate with a child node of the IAB node or a terminal.
1 . A communication apparatus, comprising:
a transceiver, configured to receive first configuration information from a source donor base station, wherein the first configuration information comprises N pieces of configuration information of a mobile terminal (MT) and N pieces of configuration information of a distributed unit (DU) that are configured by N target donor base stations for the communication apparatus, N is greater than or equal to 1, the MT is configured to communicate with a parent node of the communication apparatus, the source donor base station, or the N target donor base stations, and the DU is configured to communicate with a child node of the communication apparatus or a terminal; and
a processor, configured to enable the DU of the communication apparatus to use one piece of configuration information in the N pieces of configuration information of the DU when the MT of the communication apparatus satisfies a condition.
2 . The communication apparatus according to claim 1 , wherein the condition comprises:
a result of measuring a first signal by the MT of the communication apparatus is less than a first threshold, wherein the first signal is sent by the parent node currently connected to the communication apparatus or the source donor base station;
a result of measuring a second signal by the MT of the communication apparatus is greater than a second threshold, wherein the second signal is not sent by the parent node currently connected to the communication apparatus or the source donor base station;
a beam failure occurs on the MT of the communication apparatus on a first carrier link, wherein the first carrier link is a communication link between the communication apparatus and the parent node currently connected to the communication apparatus or the source donor base station;
a radio link failure occurs on the MT of the communication apparatus on a second carrier link, wherein the second carrier link is a communication link between the communication apparatus and the parent node currently connected to the communication apparatus or the source donor base station;
a duration accumulated since the MT of the communication apparatus receives the configuration information from the source donor base station reaches a preset duration;
the MT of the communication apparatus starts or completes a random access process;
the MT of the communication apparatus receives first signaling from the source donor base station, wherein the first signaling indicates the communication apparatus to hand over to a first target donor base station; or
the communication apparatus moves out of a target area.
3 . The communication apparatus according to claim 2 , wherein the MT of the communication apparatus satisfies the condition that the communication apparatus moves out of a target area when:
an area identifier (ID) received by the communication apparatus is inconsistent with a locally stored area ID;
an ID of a cell in which the communication apparatus is currently located is not in a received cell list; or
a donor base station corresponding to a node currently connected to the communication apparatus is not in a received donor base station list.
4 . The communication apparatus according to claim 2 , wherein that the DU of the communication apparatus uses one piece of configuration information in the N pieces of configuration information of the DU comprises:
randomly selecting one piece of configuration information from the N pieces of configuration information of the DU; or
selecting, from the N pieces of configuration information of the DU, configuration information that is of the DU and that corresponds to a first target serving node, wherein the first target serving node is one of the N target donor base stations, or the first target serving node is an integrated access and backhaul (IAB) node connected to the first target donor base station in the N target donor base stations, wherein
a reference signal sent by the first target serving node has maximum strength;
an operating band of the first target serving node is the same as that of the source donor base station; or
a random access occasion of a physical random access channel (PRACH) resource of the first target serving node arrives the earliest.
5 . The communication apparatus according to claim 1 , wherein the configuration information of the DU comprises a first set of PRACH resource configurations and a second set of PRACH resource configurations, a terminal uses the first set of PRACH resource configurations to initiate random access, and an IAB node uses the second set of PRACH resource configurations to initiate random access.
6 . The communication apparatus according to claim 5 , wherein the second set of PRACH resource configurations comprises one or more of the following configurations:
a ZC root sequence index, a PRACH configuration index, a periodicity scaling factor, a subframe or slot offset, or a quantity of random access occasion (RACH) occasions that is associated with each synchronization signal block (SSB), wherein the periodicity scaling factor and the PRACH configuration index are used to determine a period of a PRACH resource.
7 . The communication apparatus according to claim 5 , wherein the configuration information of the MT further comprises one or more of:
backhaul adaptation protocol (BAP) layer configuration information;
data bearer mapping information of the MT; or
quality of service configuration information of the MT.
8 . The communication apparatus according to claim 1 , wherein the transceiver is further configured to:
receive second configuration information from the source donor base station, wherein the second configuration information comprises P pieces of configuration information configured by the DU of the communication apparatus for P terminals, each piece of the P pieces of configuration information corresponds to one terminal identifier, and P is greater than or equal to 1.
9 . A communication apparatus, comprising a transceiver, configured to:
send a configuration request message to N target donor base stations, wherein the configuration request message comprises identification information of an integrated access and backhaul (IAB) node and N pieces of cell information of the IAB node, and N is greater than or equal to 1; and
receive configuration information sent by the N target donor base stations, wherein configuration information sent by each of the N target donor base stations comprises configuration information of an MT and configuration information of a DU that are configured by the target donor base station for the IAB node, the MT is configured to communicate with a parent node of the IAB node or the communication apparatus, and the DU is configured to communicate with a child node of the IAB node or a terminal.
10 . The communication apparatus according to claim 9 , wherein the configuration request message further comprises results of measuring synchronization signal blocks (SSBs) of a plurality of target donor base stations by the MT of the IAB node.
11 . The communication apparatus according to claim 9 , wherein the configuration request message further comprises at least one of the N pieces of cell information of the DU of the IAB node, a physical random access channel (PRACH) resource configuration, or synchronization signal configuration information.
12 . A communication apparatus, comprising a transceiver, configured to:
receive a configuration request message from a source donor base station, wherein the configuration request message comprises identification information of an integrated access and backhaul (IAB) node and N pieces of cell information of the IAB node, and N is greater than or equal to 1; and
send configuration information to the source donor base station, wherein the configuration information comprises configuration information of an MT and configuration information of a DU that are configured by the communication apparatus for the IAB node, the MT is configured to communicate with a parent node of the IAB node or the source donor base station, and the DU is configured to communicate with a child node of the IAB node or a terminal.
13 . The communication apparatus according to claim 12 , wherein the configuration information of the DU comprises a first set of PRACH resource configurations and a second set of PRACH resource configurations, a terminal uses the first set of PRACH resource configurations to initiate random access, and an IAB node uses the second set of PRACH resource configurations to initiate random access.
14 . The communication apparatus according to claim 13 , wherein the second set of PRACH resource configurations comprises one or more of the following configurations:
a ZC root sequence index, a PRACH configuration index, a periodicity scaling factor, a subframe or slot offset, or a quantity of RACH occasions that is associated with each synchronization signal block (SSB), wherein the periodicity scaling factor and the PRACH configuration index are used to determine a period of a PRACH resource.
15 . The communication apparatus according to claim 12 , wherein the transceiver is further configured to send a condition to the source donor base station, wherein the condition comprises:
a result of measuring a first signal by the MT of the IAB node is less than a first threshold, wherein the first signal is sent by a current serving node of the IAB node;
a result of measuring a second signal by the MT of the IAB node is greater than a second threshold, wherein the second signal is not sent by a current serving node of the IAB node;
a beam failure occurs on the MT of the IAB node on a first carrier link, wherein the first carrier link is a communication link between the IAB node and a current serving node of the IAB node;
a radio link failure occurs on the MT of the IAB node on a first carrier link, wherein the first carrier link is a communication link between the IAB node and a current serving node of the IAB node;
a duration accumulated since the MT of the IAB node receives the configuration information from the source donor base station reaches a preset duration;
the MT of the IAB node starts or completes a random access process;
the MT of the IAB node receives first signaling from the source donor base station, wherein the first signaling indicates the IAB node to hand over to a first target donor base station;
an area identifier;
a cell list; or
a donor base station list.