Techniques for spatial relation indication based on beam orientation
The present disclosure includes a method, apparatus, and computer readable medium for wireless communications for determining, at a first node, first beam orientation information for a second node to select one or more beams for beam training with a third node, determining, at the first node, second beam orientation information for the third node to select one or more of beams for beam training with the second node, transmitting, to the second node, the first beam orientation information, and transmitting, to the third node, the second beam orientation information.
1. A method of wireless communications at a first node, comprising:
determining, at the first node, first beam orientation information for a second node to select one or more beams for beam training with a third node;
determining, at the first node, second beam orientation information for the third node to select one or more of beams for beam training with the second node, wherein the first beam orientation information includes a first beam shape and the second beam orientation information includes a second beam shape;
identifying the first beam shape based at least on one of a pathloss or interference consideration for the second node, wherein the first beam shape corresponds to a beam width or beam shape information including side-lobe suppression or beam gain over a defined sphere direction;
identifying the second beam shape based at least on one of a pathloss or interference consideration for the third node, wherein the second beam shape corresponds to a beam width or beam shape information including side-lobe suppression or beam gain over a defined sphere direction;
transmitting, to the second node, the first beam orientation information; and
transmitting, to the third node, the second beam orientation information.
2. The method of claim 1 , wherein the first beam orientation information and the second beam orientation information includes at least one of:
a beam direction,
the first beam shape and the beam direction relative to a beam associated with a reference signal, or
the second beam shape and the beam direction relative to the beam associated with the reference signal.
3. The method of claim 2 , wherein the second node corresponds to a gNB and the third node corresponds to a user equipment (UE), and wherein the first beam orientation information indicates the first beam shape and the beam direction from the gNB to the UE and indicates to the gNB a beam selection for beam training with the UE, and the second beam orientation information indicates the second beam shape and the beam direction from the UE to the gNB and indicates to the UE another beam selection scheme for beam training with the gNB.
4. The method of claim 2 , wherein the second node corresponds to a first UE and the third node corresponds to a second UE, and wherein the first beam orientation information indicates the first beam shape and the beam direction from the first UE to the second UE and indicates to the first UE a beam selection for beam training with the second UE, and the second beam orientation information indicates the second beam shape and the beam direction from the second UE to the first UE and indicates to the second UE another beam selection scheme for beam training with the first UE.
5. The method of claim 2 , further comprising determining the beam direction, wherein determining the beam direction includes:
receiving location information of the second node and the third node; and
identifying, based on the location information, the beam direction as an absolute beam direction corresponding to a defined angular direction irrespective of a current beam of the second node or the third node, or a relative beam direction to the current beam of the second node or the third node.
6. The method of claim 5 , wherein the location information is received from a location management function or directly from the second node and the third node, and wherein the location information corresponds to three-dimensional positioning information.
7. The method of claim 5 , wherein identifying the beam direction as the relative beam direction for the first beam orientation information is further based on a two or three dimensional angular difference between an angle from the second node to the first node and an angle from the second node to the third node.
8. The method of claim 5 , wherein identifying the beam direction as the relative beam direction for the second beam orientation information is further based on a two or three dimensional angular difference between an angle from the third node to the first node and an angle from the third node to the second node.
9. The method of claim 5 , further comprising determining, by the first node, a direction of a current serving beam used by the second node to communicate with the first node, based on beam-related information from the second node to fine-tune the relative beam direction for the first beam orientation information.
10. The method of claim 5 , further comprising determining, by the first node, a direction of a current serving beam used by the third node to communicate with the first node, based on beam-related information from the third node to fine-tune the relative beam direction for the second beam orientation information.
11. The method of claim 1 , wherein the first beam orientation information triggers selection by the second node of one or more beams for beam-training with the third node based at least on a current orientation of the second node.
12. The method of claim 1 , wherein the second beam orientation information triggers selection by the third node of one or more beams for beam-training with the second node based at least on a current orientation of the third node.
13. The method of claim 1 , wherein the first beam orientation information and the second beam orientation information is transmitted via one or more of a downlink control information (DCI), a radio resource control (RRC) signaling, or a medium access control (MAC) control element (MAC-CE), an uplink control information (UCI), or via one or more of the sidelink equivalents.
14. The method of claim 1 , wherein at least a portion of the first beam orientation information or the second beam orientation information is sent on an uplink or downlink communication channel corresponding to a Uu interface or an equivalent corresponding to a sidelink interface, and wherein the first beam orientation information or the second beam orientation information is transmitted to a relay node.
15. An apparatus corresponding to a first node for wireless communication, comprising:
a transceiver;
a memory configured to store instructions; and
at least one processor communicatively coupled with the transceiver and the memory, wherein the at least one processor is configured to:
determine, at the first node, first beam orientation information for a second node to select one or more beams for beam training with a third node;
determine, at the first node, second beam orientation information for the third node to select one or more of beams for beam training with the second node, wherein the first beam orientation information includes a first beam shape and the second beam orientation information includes a second beam shape;
identify the first beam shape based at least on one of a pathloss or interference consideration for the second node, wherein the first beam shape corresponds to a beam width or beam shape information including side-lobe suppression or beam gain over a defined sphere direction;
identify the second beam shape based at least on one of a pathloss or interference consideration for the third node, wherein the second beam shape corresponds to a beam width or beam shape information including side-lobe suppression or beam gain over a defined sphere direction;
transmit, to the second node, the first beam orientation information; and
transmit, to the third node, the second beam orientation information.
16. The apparatus of claim 15 , wherein the first beam orientation information and the second beam information includes at least one of:
a beam direction,
the first beam shape and the beam direction relative to a beam associated with a reference signal, or
the second beam shape and the beam direction relative to the beam associated with the reference signal.
17. The apparatus of claim 16 , wherein the second node corresponds to a gNB and the third node corresponds to a user equipment (UE), and wherein the first beam orientation information indicates the first beam shape and the beam direction from the gNB to the UE and indicates to the gNB a beam selection for beam training with the UE, and the second beam orientation information indicates the second beam shape and the beam direction from the UE to the gNB and indicates to the UE another beam selection scheme for beam training with the gNB.
18. The apparatus of claim 16 , wherein the second node corresponds to a first UE and the third node corresponds to a second UE, and wherein the first beam orientation information indicates the first beam shape and the beam direction from the first UE to the second UE and indicates to the first UE a beam selection for beam training with the second UE, and the second beam orientation information indicates the second beam shape and the beam direction from the second UE to the first UE and indicates to the second UE another beam selection scheme for beam training with the first UE.
19. The apparatus of claim 16 , wherein the at least one processor is further configured to determine the beam direction, and wherein to determine the beam direction, the at least one processor is further configured to:
receive location information of the second node and the third node; and
identify, based on the location information, the beam direction as an absolute beam direction corresponding to a defined angular direction irrespective of a current beam of the second node or the third node, or a relative beam direction to the current beam of the second node or the third node.
20. The apparatus of claim 19 , wherein the location information is received from a location management function or directly from the second node and the third node, and wherein the location information corresponds to three-dimensional positioning information.
21. The apparatus of claim 19 , wherein the beam direction as the relative beam direction for the first beam orientation information is further identified based on a two or three dimensional angular difference between an angle from the second node to the first node and an angle from the second node to the third node.
22. The apparatus of claim 19 , wherein the beam direction as the relative beam direction for the second beam orientation information is further identified based on a two or three dimensional angular difference between an angle from the third node to the first node and an angle from the third node to the second node.
23. The apparatus of claim 19 , wherein the at least one processor is further configured to determine, by the first node, a direction of a current serving beam used by the second node to communicate with the first node, based on beam-related information from the second node to fine-tune the relative beam direction for the first beam orientation information.
24. The apparatus of claim 19 , wherein the at least one processor is further configured to determine, by the first node, a direction of a current serving beam used by the third node to communicate with the first node, based on beam-related information from the third node to fine-tune the relative beam direction for the second beam orientation information.
25. The apparatus of claim 15 , wherein the first beam orientation information triggers selection by the second node of one or more beams for beam-training with the third node based at least on a current orientation of the second node.
26. The apparatus of claim 15 , wherein the second beam orientation information triggers selection by the third node of one or more beams for beam-training with the second node based at least on a current orientation of the third node.
27. An apparatus corresponding to a first node for wireless communication, comprising:
means for determining, at the first node, first beam orientation information for a second node to select one or more beams for beam training with a third node;
means for determining, at the first node, second beam orientation information for the third node to select one or more of beams for beam training with the second node, wherein the first beam orientation information includes a first beam shape and the second beam orientation information includes a second beam shape;
means for identifying the first beam shape based at least on one of a pathloss or interference consideration for the second node, wherein the first beam shape corresponds to a beam width or beam shape information including side-lobe suppression or beam gain over a defined sphere direction;
means for identifying the second beam shape based at least on one of a pathloss or interference consideration for the third node, wherein the second beam shape corresponds to a beam width or beam shape information including side-lobe suppression or beam gain over a defined sphere direction;
means for transmitting, to the second node, the first beam orientation information; and
means for transmitting, to the third node, the second beam orientation information.
28. A non-transitory computer-readable medium storing computer code executable by a processor of a first node for wireless communications comprising code for:
determining, at the first node, first beam orientation information for a second node to select one or more beams for beam training with a third node;
determining, at the first node, second beam orientation information for the third node to select one or more of beams for beam training with the second node, wherein the first beam orientation information includes a first beam shape and the second beam orientation information includes a second beam shape:
identifying the beam first shape based at least on one of a pathloss or interference consideration for the second node, wherein the first beam shape corresponds to a beam width or beam shape information including side-lobe suppression or beam gain over a defined sphere direction;
identifying the second beam shape based at least on one of a pathloss or interference consideration for the third node, wherein the second beam shape corresponds to a beam width or beam shape information including side-lobe suppression or beam gain over a defined sphere direction;
transmitting, to the second node, the first beam orientation information; and
transmitting, to the third node, the second beam orientation information.