Sharing channel occupancy time of a node in an integrated access backhaul network
Wireless communications systems and methods related to sharing channel occupancy time (COT) for a channel in an unlicensed 5G spectrum in an integrated access backhaul (IAB) network are provided. In some aspects, an IAB node of the IAB network may perform a channel access procedure to acquire the COT and share the COT with a parent IAB node and/or a child IAB node for the parent IAB node and/or child IAB node to communicate back with the COT initiating IAB node. The sharing of the COT with the parent IAB node and/or child IAB node may also include a sharing of the same COT between a distributed unit and a mobile terminal of the COT-initiating IAB node.
1. A method of wireless communication performed by an integrated access backhaul (IAB) node including a first entity and a second entity, the method comprising:
performing, for signal transmission by the first entity, a first channel access procedure to acquire a channel occupancy time (COT) for a channel in an unlicensed 5G spectrum;
allowing the second entity to access the channel and communicate a communication signal via the channel, during the COT; and
performing a second channel access procedure for the second entity to access the channel and communicate the communication signal, during the COT, wherein
the first entity and the second entity are co-located in the IAB node; and
one of the first entity or the second entity is a distributed unit (DU) of the IAB node and the other entity is a mobile terminal (MT) of the IAB node.
2. The method of claim 1 , wherein the first channel access procedure is a type 1 channel access procedure and the second channel access procedure is a type 2 channel access procedure.
3. The method of claim 1 , wherein the performing the second channel access procedure is based on a type of the channel or a resource type of the first entity and/or the second entity.
4. The method of claim 1 , wherein:
the first entity is the DU and the second entity is the MT; and
the communication signal includes information related to the second channel access procedure performed by the MT.
5. The method of claim 1 , wherein:
the first entity is the MT and the second entity is the DU; and
the communication signal excludes information related to sharing of the COT.
6. The method of claim 1 , further comprising determining there is a transmission gap between a last transmission of a signal in the channel and a next transmission of a signal by the second entity in the channel.
7. The method of claim 6 , wherein the transmission gap is no less than 25 microseconds and the second channel access procedure is a type 2 A channel access procedure.
8. The method of claim 6 , wherein the transmission gap is equal to 16 microseconds and the second channel access procedure is a type 2 B channel access procedure.
9. The method of claim 6 , wherein the transmission gap is no greater than 16 microseconds and the second channel access procedure is a type 2 C channel access procedure.
10. The method of claim 6 , wherein the second channel access procedure is a type 2 A channel access procedure only when the transmission gap is equal to 25 microseconds.
11. The method of claim 1 , wherein the first entity is the DU and the second entity is the MT, the method further comprising:
switching by the MT from a prior type 1 channel access procedure to a type 2 channel access procedure before performing the second channel access procedure.
12. A method of wireless communication performed by an integrated access backhaul (IAB) node including a first entity and a second entity co-located with the first entity, the method comprising:
performing, for signal transmission by the first entity, a first channel access procedure to acquire a channel occupancy time (COT) for a channel in an unlicensed 5G spectrum;
communicating, via the second entity, a first communication signal with a third entity to allow the third entity to access the channel and communicate with the TAB node, during the COT; and
receiving, at the TAB node, a second communication signal from the third entity during the COT, wherein:
the first entity is a first distributed unit (DU), the second entity is a mobile terminal (MT) and the third entity is a parent DU of the IAB node, or
the first entity is a first MT, the second entity is a DU and the third entity is a user equipment (UE) or a child MT of the IAB node.
13. The method of claim 12 , wherein the third entity performs a second channel access procedure to access the channel and communicate with the IAB node.
14. The method of claim 13 , wherein the first channel access procedure is a type 1 channel access procedure and the second channel access procedure is a type 2 channel access procedure.
15. The method of claim 13 , wherein the third entity determines there is a transmission gap between a last transmission of a signal in the channel and a next transmission of a signal by the third entity in the channel.
16. The method of claim 15 , wherein the transmission gap is no: (i) less than 25 microseconds and the second channel access procedure is a type 2 A channel access procedure; (ii) equal to 16 microseconds and the second channel access procedure is a type 2 B channel access procedure; or (iii) no greater than 16 microseconds and the second channel access procedure is a type 2 C channel access procedure.
17. The method of any of claim 12 , wherein:
the first entity is the first DU, the second entity is the MT and the third entity is the parent DU of the IAB node; and
the first communication signal includes an uplink (UL) communication signal having information to be communicated from the MT to the parent DU of the IAB node.
18. The method of claim 17 , wherein the information includes channel access information related to a switch from a type 1 channel access procedure to a type 2 channel access procedure performed by the MT prior to communicating the first communication signal.
19. The method of claim 17 , wherein the information includes COT sharing information related to the COT.
20. The method of claim 17 , wherein the information includes a request indicating a channel access procedure to be performed by the parent DU for incoming signal transmission.
21. The method of claim 17 , wherein:
the communicating the first communication signal with the third entity is based on a resource type of the first DU.
22. A method of wireless communication performed by a first entity of a first integrated access backhaul (TAB) node, comprising:
performing, for signal transmission by the first entity, a first channel access procedure to acquire a channel occupancy time (COT) for a channel in an unlicensed 5G spectrum;
communicating a first communication signal with a second entity to allow the second entity to access the channel and communicate with the first entity, during the COT; and
receiving a second communication signal from the second entity during the COT, wherein
the first entity is a distributed unit (DU) of the first TAB node, and the second entity is either (i) a user equipment (UE) or (ii) a mobile terminal (MT) of a second TAB node that is a child node of the first TAB node; or
the first entity is a MT of the first TAB node, and the second entity is a DU of a second TAB node that is a parent node to the first TAB node.
23. The method of claim 22 , wherein:
the first entity is the DU of the first TAB node, and the second entity is the MT of the second TAB node; and
the MT performs a type 2 channel access procedure to access the channel and communicate with the DU.
24. The method of claim 23 , wherein the MT switches from a type 1 channel access procedure to the type 2 channel access procedure prior to accessing the channel.
25. The method of claim 24 , wherein the MT switches from a type 1 channel access procedure to the type 2 channel access procedure based on a semi-static configuration established by an IAB donor of an IAB network including the IAB node.
26. The method of claim 24 , wherein the MT switches from a type 1 channel access procedure to the type 2 channel access procedure without input from the DU.
27. The method of claim 26 , wherein the MT transmits to the DU a notification of the switch from a type 1 channel access procedure to the type 2 channel access procedure.
28. The method of claim 24 , wherein the MT switches from a type 1 channel access procedure to the type 2 channel access procedure in response to receiving a dynamic indication from the DU.
29. The method of claim 28 , wherein the dynamic indication is based on quality of signal traffic type for uplink (UL) transmission to the DU by the MT, a channel access priority class of the type 1 channel access procedure, a type of the channel, a buffer status of the UL transmission, a resource type of the DU, a resource type of the MT and/or a transmission configuration indication (TCI) state of the UL transmission.
30. An apparatus, comprising:
a processor configured to:
perform, for signal transmission by a first entity of an integrated access backhaul (IAB) node, a first channel access procedure to acquire a channel occupancy time (COT) for a channel in an unlicensed 5G spectrum;
allow a second entity of the IAB node to access the channel and communicate a communication signal via the channel, during the COT; and
perform a second channel access procedure for the second entity to access the channel and communicate the communication signal, during the COT, wherein
the first entity and the second entity are co-located in the IAB node; and
one of the first entity or the second entity is a distributed unit (DU) of the IAB node and the other entity is a mobile terminal (MT) of the IAB node.