RACH configuration for different power classes
Aspects of the present disclosure provide techniques for addressing scenarios where the minimum transmit power supported by a wireless node (e.g., an Integrated Access and Backhaul (IAB) node) is above a minimum value specified by a standard. In some cases, the node may signal information regarding its power configuration so a network entity of the may take it into account (e.g., when allocating or scheduling resources). The power configuration may include an indication of the minimum transmit power supported by the node and/or an indication of a guard band that may help the IAB control adjacent channel leakage.
1. An apparatus for wireless communications by a first node, comprising:
at least one processor and a memory configured to:
receive, from a network entity, signaling indicating different random access channel (RACH) configurations for different power classes associated with different minimum transmit power configurations, wherein:
the RACH configurations are associated with at least one of an initial uplink bandwidth part (BWP) or an initial downlink BWP that includes a guard band between adjacent channels, wherein a size of the guard band depends on at least one of channel bandwidth, width of the BWP, or a transmit power configuration supported by the first node; and
the different minimum transmit power configurations comprise a minimum transmit power supported by the first node; and
perform a RACH procedure based on a RACH configuration for a power class of the first node.
2. The apparatus of claim 1 , wherein the first node comprises a node of an integrated access and backhaul (IAB) network.
3. The apparatus of claim 2 , wherein the first node uses a shared architecture for both a mobile termination (MT) component and a distributed unit (DU).
4. The apparatus of claim 1 , wherein:
different synchronization signal rasters are used for different power classes; and
a raster for a power class is chosen such that a default initial downlink BWP is in a desired frequency location.
5. The apparatus of claim 1 , wherein the size of the guard band depends on a largest minimum transmit power supported by the first node or other nodes in the same power class as the first node.
6. The apparatus of claim 1 , wherein the signaling indicates:
a first default initial uplink BWP for nodes or user equipments (UEs) of a second power class different than a first power class of the first node; and
at least a second default initial uplink BWP for nodes or UEs in the first power class.
7. The apparatus of claim 6 , wherein configuration of the first and second default initial BWPs depends at least in part on the different minimum transmit power configurations supported by the first and second power classes, respectively.
8. The apparatus of claim 1 , wherein the different RACH configurations for different power classes differ in one or more RACH configuration parameters.
9. The apparatus of claim 8 , wherein:
the one or more RACH configuration parameters include at least one of: RACH MSG1 time and frequency resources, RACH power configurations, or a maximum number of retransmissions; and
the RACH MSG1 time and frequency resources for different power classes have different synchronization signal block (SSB) to RACH association patterns.
10. The apparatus of claim 9 , wherein the RACH power configurations for different power classes differ in at least one of: target receive power, synchronization signal block (SSB) reference signal received power (RSRP) threshold, or power ramping step.
11. An apparatus for wireless communications by a network entity, comprising:
at least one processor and a memory configured to:
determine one or more random access channel (RACH) configurations based at least in part on power classes associated with different minimum transmit power configurations supported by nodes associated with the network entity, wherein:
the RACH configurations are associated with at least one of an initial uplink bandwidth part (BWP) or an initial downlink BWP that includes a guard band between adjacent channels, wherein a size of the guard band depends on at least one of channel bandwidth, width of the BWP, or a transmit power configuration supported by a first node; and
the different minimum transmit power configurations comprise a minimum transmit power supported by the nodes;
transmit, to a first node of the nodes, signaling indicating the one or more RACH configurations; and
participate in a RACH procedure with the first node, using a RACH configuration based on a power class of the first node.
12. The apparatus of claim 11 , wherein:
the network entity comprises a network entity of an integrated access and backhaul (IAB) network; and
the first node comprises a node of the IAB network.
13. The apparatus of claim 11 , wherein:
one or more synchronization signal rasters are used for different power classes; and
a raster for a power class is chosen such that a default initial downlink BWP is in a desired frequency location.
14. The apparatus of claim 11 , wherein the size of the guard band depends on a largest minimum transmit power supported by the first node or other nodes in the same power class as the first node.
15. The apparatus of claim 11 , wherein the signaling indicates:
a first default initial uplink BWP for nodes or user equipments (UEs) of a second power class different than a first power class of the first node; and
at least a second default initial uplink BWP for nodes or UEs in the first power class.
16. The apparatus of claim 15 , wherein configuration of the first and second default initial BWPs depends at least in part on the different minimum transmit power configurations supported by the first and second power classes, respectively.
17. The apparatus of claim 11 , wherein the at least one processor and the memory are further configured to determine different RACH configurations for different power classes, wherein different RACH configurations differ in one or more RACH configuration parameters.
18. The apparatus of claim 17 , wherein the one or more RACH configuration parameters include at least one of: RACH MSG1 time and frequency resources, RACH power configurations, or a maximum number of retransmissions.
19. The apparatus of claim 18 , wherein the RACH MSG1 time and frequency resources for different power classes have different synchronization signal block (SSB) to RACH association patterns.
20. The apparatus of claim 18 , wherein the RACH power configurations for different power classes differ in at least one of: target receive power, synchronization signal block (SSB) reference signal received power (RSRP) threshold, or power ramping step.
21. A method for wireless communications by a first node, comprising:
receiving, from a network entity, signaling indicating different random access channel (RACH) configurations for different power classes associated with different minimum transmit power configurations, wherein:
the RACH configurations are associated with at least one of an initial uplink bandwidth part (BWP) or an initial downlink BWP that includes a guard band between adjacent channels, wherein a size of the guard band depends on at least one of channel bandwidth, width of the BWP, or a transmit power configuration supported by the first node; and
the different minimum transmit power configurations comprise a minimum transmit power supported by the first node; and
performing a RACH procedure based on a RACH configuration for a power class of the first node.
22. The method of claim 21 , wherein the first node comprises a node of an integrated access and backhaul (IAB) network.
23. The method of claim 21 , wherein the first node uses a shared architecture for both a mobile termination (MT) component and a distributed unit (DU).
24. The method of claim 21 , wherein the different RACH configurations for different power classes differ in one or more RACH configuration parameters.
25. A method for wireless communications by a network entity, comprising:
determining one or more random access channel (RACH) configurations based at least in part on power classes associated with different minimum transmit power configurations supported by nodes associated with the network entity, wherein:
the RACH configurations are associated with at least one of an initial uplink bandwidth part (BWP) or an initial downlink BWP that includes a guard band between adjacent channels, wherein a size of the guard band depends on at least one of channel bandwidth, width of the BWP, or a transmit power configuration supported by A first node; and
the different minimum transmit power configurations comprise a minimum transmit power supported by the nodes;
transmitting, to a first node of the nodes, signaling indicating the one or more RACH configurations; and
participating in a RACH procedure with the first node, using a RACH configuration based on a power class of the first node.
26. The method of claim 25 , wherein:
the network entity comprises a network entity of an integrated access and backhaul (IAB) network; and
the first node comprises a node of the IAB network.
27. The apparatus of claim 3 , wherein the shared architecture for both the MT component and the DU supplies the MT component and the DU with a same power configuration and a same capability.