Random Access Channel (RACH) Optimization for Interference Coordination in Integrated Access and Backhaul (IAB) Networks

Abstract

Various aspects of this disclosure provide techniques for interference coordination between wireless nodes (e.g., nodes in an integrated access and backhaul (IAB) network). These techniques generally include: a first wireless node determining resources for transmitting an instruction for interference coordination to a second wireless node; and transmitting the determined instructions to the second wireless node using the determined resources as part of an interference coordination protocol.

Description

[0001] Cross-references to related applications

[0002] This application hereby claims priority to U.S. Application No. 17 / 096,580, filed November 12, 2020, which claims priority to Pending U.S. Provisional Patent Application No. 62 / 956,885, filed January 3, 2020, pursuant to 35 U.S.SC §119, the contents of which are incorporated herein by reference.

[0003] open field

[0004] Various aspects of this disclosure relate to wireless communications, and in particular to techniques for interference coordination between wireless nodes, such as integrated access and backhaul (IAB) networks or other types of networks.

[0005] Related technical descriptions

[0006] Wireless communication systems are widely deployed to provide a variety of telecommunications services such as telephone, video, data, messaging, and broadcasting. These wireless communication systems can employ multiple access technologies that enable communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access systems include 3GPP Long Term Evolution (LTE) systems, LTE-A Advanced systems, Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, and Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems, to name just a few.

[0007] In some examples, a radio multiple access communication system may include several base stations (BSs), each capable of simultaneously supporting communication with multiple communication devices (also referred to as user equipment (UEs)). In LTE or LTE-A networks, a set containing one or more base stations may define an evolved B-node (eNB). In other examples (e.g., in next-generation, new radio (NR), or 5G networks), a radio multiple access communication system may include several distributed units (DUs) (e.g., edge units (EUs), edge nodes (ENs), radio heads (RHs), smart radio heads (SRHs), transmit-receive points (TRPs), etc.) communicating with several central units (CUs) (e.g., central nodes (CNs), access node controllers (ANCs), etc.), and a set containing one or more DUs communicating with the CUs may define an access node (e.g., which may be referred to as a BS, a next-generation B-node (gNB or gB node), a TRP, etc.). The BS or DU may communicate with the set of UEs on downlink channels (e.g., for transmissions from the BS or DU to the UE) and uplink channels (e.g., for transmissions from the UE to the BS or DU).

[0008] These multiple access technologies have been adopted in various telecommunications standards to provide a common protocol enabling different wireless devices to communicate at the city, country, region, and even global levels. New radios (e.g., 5G NR) are examples of emerging telecommunications standards. NR is an enhancement set of the LTE mobile standard issued by 3GPP. NR is designed to better support mobile broadband Internet access by using OFDMA with a cyclic prefix (CP) on both the downlink (DL) and uplink (UL) to improve spectrum efficiency, reduce costs, improve service, utilize new spectrum, and better integrate with other open standards. To this end, NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

[0009] In some scenarios, wireless nodes implementing the above characteristics can be flexibly deployed in an arrangement known as an Integrated Access and Backhaul (IAB) network. In an IAB network, one or more IAB donors are connected to the core network via a wired connection (e.g., fiber optic cable) and provide access to one or more other nodes (called child nodes). A child node can then act as a parent node to other child nodes.

[0010] In an IAB network, a transmission from one wireless node may interfere with one or more other nodes. Various aspects of this disclosure provide mechanisms for reducing or mitigating the effects of such interference.

[0011] Overview

[0012] The systems, methods, and apparatuses of this disclosure each have several aspects, and their desired properties are not solely attributed to any single aspect. Without limiting the scope of this disclosure as set forth in the appended claims, some features will now be briefly discussed. Upon consideration of this discussion, and especially after reading the section entitled “Detailed Description,” it will be understood how the features of this disclosure provide advantages including improved communication between wireless communication devices.

[0013] Some aspects provide a method for wireless communication by a first wireless node. The method generally includes: determining resources for transmitting an indication of interference coordination to a second wireless node; and transmitting the indication to the second wireless node using the determined resources as part of an interference coordination procedure.

[0014] Some aspects provide a method for wireless communication by a first wireless node. The method generally includes: detecting an indication for interference coordination transmitted from a second wireless node as part of an interference coordination procedure; and participating in the interference coordination procedure with the second wireless node based on the indication.

[0015] Some aspects provide an apparatus for wireless communication by a first wireless node. The apparatus generally includes: means for determining resources for transmitting an instruction for interference coordination to a second wireless node; and means for transmitting the determined resources to the second wireless node as part of an interference coordination procedure.

[0016] Some aspects provide an apparatus for wireless communication by a first wireless node. The apparatus generally includes: means for detecting an indication for interference coordination transmitted from a second wireless node as part of an interference coordination procedure; and means for participating in an interference coordination procedure with the second wireless node based on the indication.

[0017] Some aspects provide an apparatus for wireless communication by a first wireless node. The apparatus generally includes a processing system configured to determine resources for transmitting an indication for interference coordination to a second wireless node; and an interface configured to output the determined indication to the second wireless node for transmission as part of an interference coordination protocol using the determined resources.

[0018] Some aspects provide an apparatus for wireless communication by a first wireless node. The apparatus generally includes a processing system configured to: detect an indication for interference coordination transmitted from a second wireless node as part of an interference coordination procedure; and participate in the interference coordination procedure with the second wireless node based on the indication.

[0019] Some aspects provide a first wireless node, which generally includes a processing system configured to determine resources for sending an indication of interference coordination to a second wireless node; and a transmitter configured to use the determined resources to transmit the indication to the second wireless node as part of an interference coordination procedure.

[0020] Some aspects provide a first wireless node, which generally includes at least one antenna and a processing system configured to detect, via the at least one antenna, an instruction for interference coordination transmitted from a second wireless node as part of an interference coordination procedure; and to participate in an interference coordination procedure with the second wireless node based on the instruction.

[0021] Some aspects provide a computer-readable medium for wireless communication. The computer-readable medium generally includes code executable to perform the following operations: determining resources for transmitting an indication of interference coordination to a second wireless node; and outputting the determined indication to the second wireless node for transmission using the determined resources, as part of an interference coordination protocol.

[0022] Some aspects provide a computer-readable medium for wireless communication. The computer-readable medium generally includes code executable to perform the following operations: detecting an instruction for interference coordination transmitted from a second wireless node as part of an interference coordination procedure; and participating in the interference coordination procedure with the second wireless node based on the instruction.

[0023] Various aspects of this disclosure provide wireless nodes, apparatuses, devices, processors, and computer-readable media for performing the methods described herein.

[0024] To achieve the foregoing and related objectives, these one or more aspects include the features fully described below and specifically pointed out in the claims. Certain illustrative features of these one or more aspects are set forth in detail in the following description and drawings. However, these features merely indicate a few of the various ways in which the principles of these aspects may be employed. Brief description of the attached diagram

[0026] To gain a more detailed understanding of the manner in which the features described above are presented in this disclosure, reference can be made to various aspects of the above brief overview, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only certain typical aspects of this disclosure and should not be considered as limiting its scope, as other equivalent aspects are permissible in this description.

[0027] Figure 1 It is a block diagram that conceptually illustrates certain aspects of an example telecommunications system according to this disclosure.

[0028] Figure 2It is a block diagram that conceptually illustrates the design of an example base station (BS) and user equipment (UE) according to certain aspects of this disclosure.

[0029] Figure 3 This is a diagram illustrating examples of radio access networks according to various aspects of this disclosure.

[0030] Figure 4 This is a diagram illustrating an example of an integrated access and backhaul (IAB) network architecture according to various aspects of this disclosure.

[0031] Figure 5 This is a timing diagram illustrating an example four-step RACH procedure according to certain aspects of this disclosure.

[0032] Figure 6A , 6B 6C explains and demonstrates various communication systems under different interference scenarios.

[0033] Figure 7 A flowchart illustrating example operations for wireless communication according to various aspects of this disclosure is provided.

[0034] Figure 8 A flowchart illustrating example operations for wireless communication according to various aspects of this disclosure is provided.

[0035] Figure 9A and 9B Examples of the use of the Synchronization Signal Block (SSB) and Random Access Channel (RACH) mechanisms for interference coordination purposes, according to various aspects of this disclosure, are explained.

[0036] To facilitate understanding, the same reference numerals are used wherever possible to designate common elements shared by all figures. Elements disclosed in one aspect are conceived to be usefully applied in other aspects without specific citation.

[0037] Detailed description

[0038] Various aspects of this disclosure provide techniques for interference coordination between radio nodes in, for example, Integrated Access and Backhaul (IAB) networks. As will be described in more detail below, in some cases, a Random Access Channel (RACH) mechanism may be utilized to provide interference coordination between radio nodes in an IAB network. In some cases, interference coordination may include shared power management priority values ​​used to determine which nodes should adjust their transmission (TX) configurations to minimize interference to other nodes.

[0039] The following description provides examples and is not intended to limit the scope, applicability, or examples set forth in the claims. Changes may be made to the function and arrangement of the elements discussed without departing from the scope of this disclosure. Various procedures or components may be appropriately omitted, substituted, or added to the examples. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Moreover, features described with reference to some examples may be combined in others. For example, any number of aspects set forth herein may be used to implement an apparatus or practice. Furthermore, the scope of this disclosure is intended to cover such apparatuses or methods practiced using additional structures, functionalities, or structures and functionalities that complement or supplement the various aspects of this disclosure set forth herein. It should be understood that any aspect of this disclosure disclosed herein may be implemented by one or more elements of the claims. The term “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” is not necessarily to be construed as superior to or overriding other aspects.

[0040] Generally, any number of wireless networks can be deployed in a given geographical area. Each wireless network can support a specific Radio Access Technology (RAT) and can operate on one or more frequencies. A RAT may also be referred to as a radio technology, air interface, etc. A frequency may also be referred to as a carrier, subcarrier, frequency channel, frequency modulation, subband, etc. Each frequency can support a single RAT in a given geographical area to avoid interference between wireless networks using different RATs. In some cases, 5G NR RAT networks can be deployed.

[0041] Figure 1 An example wireless communication network 100 in which various aspects of this disclosure can be performed is described. For example, network 100 may include components configured to perform... Figure 7 Operation 700 and / or Figure 8 The operation of the IAB node of 800 (e.g., implemented as UE 120 or BS 110).

[0042] like Figure 1 As explained herein, the wireless communication network 100 may include several base stations (BSs) 110a-z (each individually referred to herein as BS 110 or collectively as BS 110) and other network entities. BS 110 may provide communication coverage for a specific geographic area (sometimes referred to as a “cell”), which may be stationary or mobile depending on the location of the mobile BS 110. In some examples, BS 110 may interconnect with each other and / or interconnect to one or more other BSs or network nodes (not shown) in the wireless communication network 100 using any suitable transport network through various types of backhaul interfaces (e.g., direct physical connection, wireless connection, virtual network, etc.). Figure 1 In the example shown, BS 110a, 110b, and 110c can be macro BSs for macro cells 102a, 102b, and 102c, respectively. BS 110x can be a pico BS for pico cell 102x. BS 110y and 110z can be femto BSs for femto cells 102y and 102z, respectively. A BS can support one or more cells. BS 110 communicates with user equipment (UE) 120a-y (each individually referred to herein as UE 120 or collectively as UE 120) in the wireless communication network 100. UE 120 (e.g., 120x, 120y, etc.) can be distributed throughout the wireless communication network 100, and each UE 120 can be stationary or mobile.

[0043] The wireless communication network 100 may also include a relay station (e.g., relay station 110r) (also referred to as a relay, etc.) that receives data and / or other information transmissions from an upstream station (e.g., BS 110a or UE 120r) and sends data and / or other information transmissions to a downstream station (e.g., UE 120 or BS 110), or relays transmissions between the UEs 120 to facilitate communication between the devices.

[0044] Network controller 130 can be coupled to a group of BS 110 and provide coordination and control over these BS 110. Network controller 130 can communicate with BS 110 via backhaul. BS 110 can also communicate with each other via wireless or wired backhaul (e.g., directly or indirectly).

[0045] Figure 2 The description explains BS 110 and UE 120, which can be used to implement various aspects of this disclosure (e.g., in...). Figure 1 Example components 200 in the wireless communication network 100. For example, antenna 252, processors 266, 258, 264 and / or controller / processor 280 of UE 120, and / or antenna 234, processors 220, 230, 238 and / or controller / processor 240 of BS 110 may be used to perform the various techniques and methods described herein.

[0046] It should be noted that, although Figure 2 The explanation describes how UE 120 communicates with BS 110, but child IAB nodes can similarly communicate with their parent IAB node (or other network entities) and each can (e.g., separately) have the following characteristics: Figure 2 Similar components as discussed. In other words, child IAB nodes and / or parent IAB nodes may have components similar to BS 110 or UE 120 and may be configured to perform... Figure 7Operation 700 and / or Figure 8 Operation 800.

[0047] At BS 110, the transmit processor 220 can receive data from data source 212 and control information from controller / processor 240. This control information can be used for the Physical Broadcast Channel (PBCH), Physical Control Format Indicator Channel (PCFICH), Physical Hybrid ARQ Indicator Channel (PHICH), Physical Downlink Control Channel (PDCCH), Group Shared PDCCH (GC PDCCH), etc. Data can be used for the Physical Downlink Shared Channel (PDSCH), etc. The processor 220 can process (e.g., encode and map symbol) the data and control information to obtain data symbols and control symbols respectively. The transmit processor 220 can also generate reference symbols (such as those for the Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS), and Cell-Specific Reference Signal (CRS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, and / or reference symbols where applicable, and can provide the output symbol stream to modulators (MODs) 232a-232t. Each modulator 232 can process its respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator can further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The downlink signal from modulators 232a-232t can be transmitted via antennas 234a-234t respectively.

[0048] At UE 120, antennas 252a-252r can receive downlink signals from BS 110 or a parent IAB node, or a child IAB node can receive downlink signals from a parent IAB node, and can respectively provide the received signals to demodulators (DEMODs) 254a-254r in the transceiver. Each demodulator 254 can condition (e.g., filter, amplify, down-convert, and digitize) its respective received signal to obtain an input sample. Each demodulator can further process the input sample (e.g., for OFDM, etc.) to obtain received symbols. MIMO detector 256 can obtain the received symbols from all demodulators 254a-254r, perform MIMO detection on these received symbols where applicable, and provide detected symbols. Receiver processor 258 can process (e.g., demodulate, deinterleave, and decode) these detected symbols, provide the decoded data to UE 120 to data sink 260, and provide the decoded control information to controller / processor 280.

[0049] On the uplink, at UE 120 or a sub-IAB node, transmit processor 264 can receive and process data from data source 262 (e.g., data for the Physical Uplink Shared Channel (PUSCH) or PSSCH) and control information from controller / processor 280 (e.g., control information for the Physical Uplink Control Channel (PUCCH) or PSCCH). Transmit processor 264 can also generate reference symbols for reference signals (e.g., probe reference signals (SRS)). Symbols from transmit processor 264 can be pre-encoded by TX MIMO processor 266 where applicable, further processed by demodulators in transceivers 254a-254r (e.g., for SC-FDM, etc.), and transmitted to base station 110 or the parent IAB node.

[0050] At BS 110 or the parent IAB node, uplink signals from UE 120 can be received by antenna 234, processed by modulator 232, detected by MIMO detector 236 where applicable, and further processed by receiver processor 238 to obtain decoded data and control information transmitted by UE 120. Receiver processor 238 can provide the decoded data to data sink 239 and the decoded control information to controller / processor 240.

[0051] Controllers / processors 240 and 280 can respectively direct operations at BS 110 and UE 120. Controller / processor 240 and / or other processors and modules at BS 110 can execute or direct the execution of processes using the techniques described herein. Controller / processor 280 and / or other processors and modules at UE 120 can execute or direct the execution of processes using the techniques described herein. Memory 242 and 282 can respectively store data and program code for use by BS 110 and UE 120. Scheduler 244 can schedule the UE for downlink and / or uplink data transmission.

[0052] Figure 3 This is a diagram illustrating examples of radio access networks according to various aspects of this disclosure.

[0053] As indicated by reference numeral 305, a conventional (e.g., 3G, 4G, LTE) radio access network may include multiple base stations 310 (e.g., access nodes (ANs)), each base station 310 communicating with the core network via a wired backhaul link 315 (such as a fiber optic connection). Base stations 310 may communicate with the UE 320 via an access link 325 (which may be a radio link). In some aspects, Figure 3 The base station 310 shown in the figure can correspond to Figure 1 Base station 110 is shown in the image. Similarly, Figure 3The UE 320 shown in the figure can correspond to Figure 1 The UE 120 shown in the image.

[0054] As indicated by reference numeral 330, a radio access network may include a wireless backhaul network. In some aspects or scenarios, a wireless backhaul network may sometimes be referred to as an Integrated Access and Backhaul (IAB) network. An IAB network may include multiple base stations, and sometimes these base stations may be of different types or have different operating characteristics. For example, in some aspects, an IAB network may have at least one base station, which is an anchor base station 335. The anchor base station may communicate with the core network via a wired backhaul link 340 (such as a fiber optic connection). An anchor base station 335 may also be referred to as an IAB donor. An IAB donor is an access node with a wired connection to the core network. An IAB node is an access node that relays traffic from / to the anchor point via one or more hops. An anchor base station may be configured to communicate with other types of base stations or other communication devices (e.g., in a radio network or an IAB network).

[0055] The IAB network may also include one or more non-anchor base stations 345. Non-anchor base stations may be referred to as relay base stations or IAB nodes. Non-anchor base stations 345 may communicate directly or indirectly (e.g., via one or more other non-anchor base stations 345) with anchor base stations 335 via one or more backhaul links 350 to form a backhaul path to the core network for carrying backhaul traffic. Backhaul links 350 may be radio links. Anchor base stations 335 or non-anchor base stations 345 may communicate with one or more UEs 355 via access links 360 (which may be radio links for carrying access traffic). In some aspects, Figure 3 The anchor base station 335 or non-anchor base station 345 shown can correspond to Figure 1 Base station 110 is shown in the image. Similarly, Figure 3 The UE355 shown can correspond to Figure 1 The UE 120 shown in the image.

[0056] As indicated by reference numeral 365, in some aspects, radio access networks, including IAB networks, can utilize a wide variety of spectrum types. For example, IAB networks can utilize a wide variety of different radio frequency bands. In some specific examples and according to some aspects, millimeter-wave technology or directional communication can be used (e.g., beamforming, precoding) for communication between base stations or UEs (e.g., between two base stations, between two UEs, or between a base station and a UE). In additional or alternative aspects or examples, the wireless backhaul link 370 between base stations can use millimeter waves to carry information, or can use beamforming, precoding to point to a target base station. Similarly, the wireless access link 375 between a UE and a base station can use millimeter waves, or can be pointed to a target wireless node (e.g., a UE or a base station). In this way, inter-link interference can be reduced.

[0057] In some respects, IAB networks can support multi-hop networks or multi-hop wireless backhaul. Additionally or alternatively, each node in an IAB network can use the same radio access technology (e.g., 5G / NR). Additionally or alternatively, nodes in an IAB network can share resources for access links and backhaul links, such as time resources, frequency resources, and spatial resources. Furthermore, various architectures for IAB nodes or IAB donors can be supported.

[0058] In some aspects, an IAB donor may include a central unit (CU) configured to access IAB nodes in the core network via the IAB donor; and may include a distributed unit (DU) that schedules and communicates with the child nodes of the IAB donor.

[0059] In some aspects, an IAB node may include a mobile termination component (MT) which is scheduled and communicates with a parent node's DU; and may include a DU that schedules and communicates with the child nodes of the IAB node. The DU of the IAB node may perform the functions for the IAB node as described in conjunction with base station 110, and the MT of the IAB node may perform the functions for the IAB node as described in conjunction with UE 120.

[0060] Figure 4 These are illustrations illustrating examples of IAB network architectures according to various aspects of this disclosure. For example... Figure 4 As shown, the IAB network may include an IAB donor 405 connected to the core network via a wired connection (e.g., as a wired fiber optic cable). For example, the Ng interface of the IAB donor 405 may terminate at the core network. Additionally or alternatively, the IAB donor 405 may connect to one or more devices in the core network that provide core access and mobility management functions (AMF). In some aspects, the IAB donor 405 may include a base station 110, as described above. Figure 3The described anchor base station. As shown, IAB donor 405 may include a CU capable of performing ANC or AMF functions. This CU can configure the DU of the IAB donor 405, or can configure one or more IAB nodes 410 (e.g., the MT or DU of IAB node 410) connected to the core network via the IAB donor 405. Thus, the CU of the IAB donor 405 can control or configure the entire IAB network connected to the core network via the IAB donor 405, for example, by using control messages or configuration messages (e.g., Radio Resource Control (RRC) configuration messages, F1 Application Protocol (F1AP) messages).

[0061] As described above, the IAB network may include IAB nodes 410 (shown as IAB nodes 1 to 4) connected to the core network via IAB donor 405. As shown, IAB node 410 may include MT and DU. The MT of IAB node 410 (e.g., a child node) may be controlled or scheduled by another IAB node 410 (e.g., a parent node) or by IAB donor 405. The DU of IAB node 410 (e.g., a parent node) may control or schedule other IAB nodes 410 (e.g., child nodes of the parent node) or UE 120. Thus, DU may be referred to as a scheduling node or scheduling component, and MT may be referred to as a scheduled node or scheduled component. In some aspects, IAB donor 405 may include DU but not MT. That is, IAB donor 405 may configure, control, or schedule communications of IAB node 410 or UE 120. UE 120 may include only MT and not DU. That is, the communication of UE 120 can be controlled or scheduled by IAB donor 405 or IAB node 410 (e.g., the parent node of UE 120).

[0062] Depending on certain aspects, certain nodes can be configured to participate in control / scheduling processes. For example, in some aspects, when a first wireless node controls or schedules communications for a second wireless node (e.g., when the first wireless node provides DU functionality for the second wireless node's MT), the first wireless node may be referred to as the parent node of the second wireless node, and the second wireless node may be referred to as a child node of the first wireless node. The child node of the second wireless node may be referred to as a grandchild node of the first wireless node. Thus, the DU of the parent node can control or schedule communications for the child node of that parent node. The parent node may be IAB donor 405 or IAB node 410, and the child node may be IAB node 410 or UE 120. The communications of the MT of a child node may be controlled or scheduled by the parent node of that child node.

[0063] like Figure 4As further shown, the link between UE 120 and IAB donor 405 or between UE 120 and IAB node 410 may be referred to as access link 415. Each access link 415 may be a radio access link that provides radio access to the core network to UE 120 via IAB donor 405 and potentially via one or more IAB nodes 410.

[0064] like Figure 4 As further illustrated, the link between IAB donor 405 and IAB node 410, or between two IAB nodes 410, may be referred to as a backhaul link 420. Each backhaul link 420 may be a radio access link that provides radio access to the core network to IAB node 410 via IAB donor 405 and potentially via one or more other intermediary IAB nodes 410. In some aspects, backhaul link 420 may be a primary backhaul link or a secondary backhaul link (e.g., a backup backhaul link). In some aspects, a secondary backhaul link may be used if the primary backhaul link fails, becomes congested, or becomes overloaded. In an IAB network, network resources used for wireless communication (e.g., time resources, frequency resources, spatial resources) may be shared between access link 415 and backhaul link 420.

[0065] As mentioned above, in a typical IAB network, IAB nodes (e.g., non-anchored base stations) are stationary (i.e., do not move). Next-generation (5G) wireless networks have clearly defined the goal of providing ultra-high data rates and supporting a wide range of application scenarios. Integrated Access and Backhaul (IAB) systems have been studied in 3GPP as a possible solution to help support these goals.

[0066] As mentioned above, in IAB, a wireless backhaul solution is used to connect cells (IAB nodes) to the core network (which uses wired backhaul). Some attractive features of IAB are support for multi-hop wireless backhaul and the sharing of the same technology (e.g., NR) and resources (e.g., frequency band) for both access and backhaul links.

[0067] There are various possible architectures for IAB nodes, including Layer 2 (L2) and Layer 3 (L3) solutions, and the specific architecture deployed can depend on which layers of the protocol stack are implemented in the intermediary node (IAB node). For example, an L2 relay may implement the PHY / MAC / RLC layers.

[0068] As described herein, an IAB donor can be an enhanced gNB node with the ability to control the IAB network. A CU can refer to a central entity that controls the entire IAB network through configuration. The CU possesses RRC / PDCP layer functionality. A DU can be a scheduling node that schedules the child nodes of the IAB donor. The DU possesses RLC / MAC / PHY layer functionality. An IAB node is an L2 relay node that includes both MT and DU functionality, as described herein. An MT is a UE-like scheduled node scheduled by its parent IAB node or the IAB donor. A DU is a scheduling node that schedules the child nodes of the IAB node.

[0069] Example RACH procedure

[0070] The Random Access Channel (RACH) is so named because it refers to a radio channel (medium) that can be shared by multiple UEs and used by these UEs to (randomly) access the network for communication. For example, RACH can be used for call setup and network access for data transmission. In some cases, RACH can be used for initial network access when a UE switches from Radio Resource Control (RRC) connected idle mode to active mode, or when switching within RRC connected mode. Furthermore, RACH can be used for downlink (DL) and / or uplink (UL) data arrivals when a UE is in RRC idle or RRC inactive mode, and when re-establishing a connection with the network.

[0071] Typically, the UE monitors SSB transmissions (transmitted by the gNB using different beams) and associates them with a limited set of time / frequency resources that define the RACH timing (RO). As will be described in more detail below, upon detecting an SSB, the UE can select the RO associated with that SSB for use in the msgA transmission. The limited set of ROs helps reduce the base station's monitoring overhead (blind decoding). In other words, by associating the limited set of ROs with SSB transmissions, the gNB knows when, where, and in what direction to "listen" to RACH transmissions from the UE.

[0072] Figure 5This is a timing diagram (or “call flow diagram”) 500 illustrating an example four-step RACH procedure according to certain aspects of this disclosure. A first message (MSG1) may be sent from UE 120 to BS 110 on the Physical Random Access Channel (PRACH). In this case, MSG1 may only include the RACH preamble. BS 110 may respond with a Random Access Response (RAR) message (MSG2), which may include an identifier (ID) of the RACH preamble, timing advance (TA), uplink grant, cellular radio network temporary identifier (C-RNTI), and backoff indicator. MSG2 may include PDCCH communication, which includes control information regarding subsequent communication on the PDSCH, as explained. In response to MSG2, MSG3 is transmitted from UE 120 to BS 110 on the PUSCH. MSG3 may include one or more of the following: an RRC connection request, a tracking area update request, a system information request, a location lock or location signal request, or a scheduling request. BS 110 then responds with MSG 4, which may include a contention resolution message. In contention-free random access, a preamble is assigned to the UE and the last two messages are skipped.

[0073] As mentioned above, the UE sends a preamble on the RACH timing associated with a previous SSB transmission by the gNB. RACH procedures are used for various purposes, including initial access, synchronization, uplink scheduling requests, beam recovery, etc. The RACH configuration of a cell typically specifies the number of SSB time indices per RACH time / frequency timing (which can be one, less than one, or greater than one).

[0074] In some cases, a two-step RACH procedure can be supported to accelerate access. As the name suggests, a two-step RACH procedure can effectively "collapse" the four messages of a four-step RACH procedure into two "enhanced" messages.

[0075] A first enhanced message (msgA) can be sent from the UE to the BS. In some aspects, msgA includes some or all of the information from MSG1 and MSG3 from the four-step RACH procedure (effectively combining MSG1 and MSG3). For example, msgA may include MSG1 and MSG3 multiplexed together, such as using time division multiplexing or frequency division multiplexing. In some aspects, msgA includes a RACH preamble and payload for random access. For example, the msgA payload may include the UE-ID and other signaling information (e.g., buffer status report (BSR) or scheduling request (SR)). The BS may respond using a random access response (RAR) message (msgB), which may effectively combine the aforementioned MSG2 and MSG4. For example, msgB may include the RACH preamble ID, timing advance (TA), backoff indicator, contention resolution message, UL / DL grant, and transmit power control (TPC) command.

[0076] The techniques for interference coordination described in this paper can utilize 4-step and 2-step RACH procedures and mechanisms.

[0077] Example power management priority handling in integrated access and backhaul

[0078] Certain aspects of this disclosure relate to power management techniques for handling interference in integrated access and backhaul (IAB) networks. For example, priority values ​​can be configured for individual IAB nodes, allowing the IAB nodes to determine whether to adjust their transmission (TX) configuration in response to the occurrence of interference, as described in more detail herein.

[0079] Figure 6A , 6B Section 6C explains various communication systems illustrating different interference scenarios in an IAB network. In some respects, IAB nodes (e.g., the MT of an IAB node) can perform signal measurements and may not necessarily rely on measurements performed by the UE. IAB nodes have L2 functionality, so any L3 measurements performed by the UE can be reported to the CU due to the separation of CU and DU, as described herein.

[0080] like Figure 6A As explained, mobile IAB node 602 (e.g., an IAB node on a vehicle) may be serving UE 604. Mobile IAB node 602 may transmit to UE 604, interfering with UE 606 served by stationary IAB node 608. Similarly, transmissions from IAB node 608 to UE 606 may interfere with UE 604 served by mobile IAB node 602. In this scenario, mobile IAB node 602, interfering with stationary IAB node 608, may reduce its downlink (DL) transmit power to UE 604 to mitigate the interference.

[0081] In scenarios involving over-deployed networks or zero network planning, such as Figure 6B As explained in the document, multiple IAB nodes can have overlapping coverage, thus interfering with each other. Therefore, tiebreaking rules can be used to determine which IAB node can reduce its DL transmit power, as described in more detail herein.

[0082] Figure 6C The multi-hop IAB implementation is explained below. As explained, IAB donor 620 can serve IAB nodes 622 and 624, IAB node 624 can serve UE 630, and IAB node 622 can serve child IAB nodes 626 and 628. Transmissions from IAB node 624 to UE 630 may interfere with child IAB node 628. Furthermore, transmissions from IAB node 622 to child IAB node 628 may interfere with UE 630. Certain aspects of this disclosure provide techniques for determining which IAB node should yield (e.g., reduce its transmit power) to reduce interference. For example, in such a scenario, IAB node 624 may yield to IAB node 622 and reduce its DL transmit power to UE 630. In other words, backhaul (BH) links to child IAB nodes 626 and 628 may take precedence over access links between IAB node 624 and UE 630. In addition, the IAB node 622 has a high load and can therefore be prioritized for power management.

[0083] Certain aspects of this disclosure relate to implementing power management (PM) priority values ​​that can be used to determine which of the interfering IAB node's DU and / or sub-IAB node's MT (and UE) should modify their respective DL TX and UL TX configurations to reduce interference affecting the functionality of other nodes. As used herein, IAB node may also refer to IAB donor DU.

[0084] Example RACH optimization for integrated over-the-air power management coordination in access and backhaul

[0085] Various aspects of this disclosure provide techniques for interference coordination between wireless nodes in, for example, integrated access and backhaul (IAB) networks.

[0086] As mentioned above, a potential challenge in IAB networks is how to address interference caused by transmissions from one node to other nodes. Aspects of this disclosure utilize Synchronization Signaling Block (SSB) discovery and Random Access Channel (RACH) mechanisms to provide interference coordination between potentially interfering radio nodes in an IAB network. In some cases, the indication of interference coordination can be used as an efficient mechanism for sharing power management priority values ​​between (child / parent) nodes, which are used to determine which nodes should adjust their transmission (TX) configurations to minimize interference to other nodes.

[0087] One advantage of using existing mechanisms for interference coordination is that certain procedures can be reused or modified for efficient implementation. Another advantage of using discovery and RACH mechanisms for interference coordination is that by monitoring directed SSB transmissions to detect another (potential interference node), the corresponding RACH timing can be used to provide that other node with an indication of interference coordination. Because the RACH timing is associated with SSB transmissions, the other node knows which resources to monitor, when, and in what direction to monitor for indication (since it is already monitoring those resources for RACH transmissions).

[0088] Figure 7 This is a flowchart illustrating an example operation 700 for wireless communication by a first wireless node according to certain aspects of this disclosure. Operation 700 can be performed by the first wireless node (such as an IAB node, for example, Figure 9A and 9B The IAB node B in the middle is used to execute.

[0089] Operation 700 can be implemented in one or more processors (e.g., Figure 2 The software components executed and running on the controller / processor shown. Furthermore, the signal transmission and reception performed by the first wireless communication device in operation 700 may be, for example, by one or more antennas (e.g., Figure 2 This can be achieved via an antenna. In some aspects, signal transmission and / or reception by the first wireless communication device can be achieved via one or more processors (e.g., an antenna). Figure 2 This is achieved by obtaining and / or outputting signals through the bus interface of the controller / processor shown.

[0090] Operation 700 begins at 702 with determining the resources for sending an indication of interference coordination to the second radio node. As will be described in more detail below, the determination may be based on resources associated with an SSB detected from the second radio node (e.g., RACH timing) or on the SSB transmission configuration (STC).

[0091] At 704, the first wireless node sends the indication to the second wireless node using the determined resources as part of the interference coordination procedure. For example, the first wireless node may send the indication via RACH transmission (during a RACH event associated with a detected SSB) or via SSB transmission (based on the received STC).

[0092] Figure 8 This is a flowchart illustrating an example operation 800 for wireless communication by a first wireless node according to certain aspects of this disclosure. Operation 800 can be considered as... Figure 7 Operation 700 is complementary. For example, operation 800 can be performed by an IAB node (e.g., Figure 9A and 9B IAB node A in the IAB can be used to execute operations from another IAB node (e.g., from which the above operation 700 was performed) to perform the operation from another IAB node (e.g., Figure 9A and 9B The IAB node B in the system receives and processes the instruction for interference coordination.

[0093] Similar to operation 700, 800 can be implemented in one or more processors (e.g., Figure 2 The software components executed and running on the controller / processor 240 shown. Furthermore, the signal transmission and reception performed by the first wireless communication device in operation 800 may be, for example, by one or more antennas (e.g., Figure 2 This can be achieved via an antenna. In some aspects, signal transmission and / or reception by the first wireless communication device can be achieved via one or more processors (e.g., an antenna). Figure 2 This is achieved by obtaining and / or outputting signals through the bus interface of the controller / processor shown.

[0094] Operation 800 begins at 802 with the detection of an interference coordination instruction sent from the second wireless node as part of an interference coordination procedure. As mentioned above, this instruction can be detected as a RACH transmission or an SSB transmission from the second wireless node.

[0095] In 804, the first wireless node participates in an interference coordination procedure with the second wireless node based on this instruction. As will be described below, participation in the interference coordination procedure may involve communicating the power management priority level of the second wireless node (or its sub-nodes) and / or modifying the transmission configuration of the first wireless node (or its sub-nodes) in an effort to reduce interference.

[0096] Figure 7 and 8 For operation instructions 700 and 800, please refer to [the instructions]. Figure 9A and 9B To understand this, we can see an example mechanism used to signal instructions for interference coordination via RACH transmission.

[0097] like Figure 9A As explained, IAB node B detects an SSB transmission from its neighboring IAB node A. Based on this detection, IAB node B can determine that IAB node A is causing (or potentially causing) interference. As mentioned above, each SSB may have a corresponding RACH timing, which defines the time-frequency resources that IAB node A will monitor for sending RACH transmissions. IAB node B can identify the corresponding RACH timing from broadcast messages (e.g., SIB1).

[0098] like Figure 9B As explained in the text, IAB node B can interact with... Figure 9A The RACH transmission is sent at the RACH timing corresponding to the SSB transmission detected in the IAB. Indications based on RACH transmissions can be sent using RACH MSG 1 (RACH preamble) or RACH MSG 3. Although not shown, in other cases, IAB node B can send SSB-based indications, for example, using IAB inter-node discovery SSBs.

[0099] Sending an indication of interference coordination using the RACH timing corresponding to the detected SSB transmission provides some assurance that IAB node B will use the correct TX beam and that IAB node A will listen to the RACH (and use the correct RX beam) for a period of time.

[0100] Another advantage of using SSB and RACH mechanisms to convey instructions for interference coordination is that it does not involve the CU. Furthermore, using RACH messages (or SSB transmissions) for interference coordination eliminates the need to establish a link between IAB node A and IAB node B (which is typically limited to parent-child relationships).

[0101] As mentioned above, in some situations, power management (PM) priority levels can be assigned to IAB nodes. How an IAB node responds to interference coordination instructions may depend on the corresponding PM priority level. As mentioned above, PM priority levels can be used to determine which of the interfering IAB node's DU and / or sub-IAB node's MT (and sub-UE) will modify their respective DL TX and UL TX configurations to reduce interference affecting the functionality of other nodes.

[0102] In some cases, the interference coordination indication techniques described herein can be used to convey information about (e.g., the PM priority level of the IAB node sending the indication and / or its child nodes) or to prompt the IAB node to convey its PM priority level.

[0103] For example, refer to again Figure 9A and 9BIAB node B may know that it has a higher priority than IAB node A, but it cannot be guaranteed that IAB node A is aware of this. As another example, IAB node B may not know the PM priority level of IAB node A. In some cases, there may be no concept of a PM priority level at the node (e.g., PM priority levels are not assigned / used or supported). In some cases, IAB node B can actually measure interference from IAB node A.

[0104] In some situations, the first radio node may request the second radio node to send an instruction to the third node for interference coordination. For example, the first radio node may be a DU, and the second radio node may be a sub-MT (or sub-UE).

[0105] The content or information conveyed via instructions for interference coordination may vary. As mentioned above, the instructions may carry an indication of interference (e.g., based on actual interference measured / detected by the nodes).

[0106] In some cases, this indication can convey a channel quality metric. For example, it can convey the reference signal received power (RSRP) measured by the node sending the indication. As another example, the indication can provide (or be used to generate) an estimate of path loss (PL) (e.g., based on the signal power received by a second wireless node).

[0107] As mentioned above, in some cases, this indication can be used to provide the PM priority level of the IAB node sending the indication. In some cases, the indication can provide the IAB node's ID (e.g., an ID assigned by the core network) or the IDs (e.g., PCIs) of one or more cells served by the IAB node DU.

[0108] The instruction may also carry auxiliary (“helper”) information that the IAB node receiving the instruction can use to determine how to modify its own transmission (TX) configuration or the TX configuration of its sub-MT / UE. As used herein, TX configuration can refer to various configurations designed to reduce interference, such as TX power or power range, transmission periodicity, number of TX opportunities per cycle (duty cycle), frequency domain resources (e.g., resource blocks (RBs) / bandwidth portions (BWPs) for communication), beam sweep configurations (e.g., number of beams and beam shape) for measuring interference signals (RS) / broadcast signals and messages, beam configurations (e.g., beamwidth) for control / data communication, or any combination thereof. For example, the TX power of a particular signal / channel / resource can be set using TX configuration because having a selective power profile may be important for more flexible power control.

[0109] As an example of supplementary information, the first IAB node may indicate information about the second IAB node that can be used to perform power backoff (generally referring to a reduction in maximum transmit power). For example, the supplementary information may indicate that the second IAB node will backoff power X dB, or backoff X dB and Y dB, in beam directions that are quasi-co-located with certain SSB indices (e.g., 1 and 3, respectively).

[0110] The first wireless node may send one or more indications to the second wireless node. These indications may be explicit, for example, as a payload of RACH MSG 3. In other cases, the indications may be implicit.

[0111] Implicit indications can be encoded by resources on which one or more indications are transmitted. In some cases, specific RACH resources / timings can be reserved for indicating interference coordination. For example, corresponding to the two beam directions on which the second IAB node transmits SSBs detected by the first IAB node, the first IAB node may send a RACH preamble (MSG1) to the second IAB node at one RACH timing and send another preamble at the second RACH timing.

[0112] In some cases, implicit indications can be encoded via the TX configuration (as described above) used to transmit the indications. For example, a first IAB node can send an MSG 1 (RACH preamble) with a different power configuration to a second IAB node, such that the received power is X dB higher than the target received power (which can be indicated in the RACH configuration carried in the SIB1 transmitted by the second IAB node). In other words, a RACH preamble detected with a received power higher than the expected target received power can be interpreted as an indication of interference coordination (rather than normal RACH).

[0113] In some cases, implicit indications can be encoded (conveying the indication) through the structure of the transmitted signal. For example, a specific RACH preamble format or combination of formats can be used to indicate interference. The preamble format can be defined by parameters such as the generation of the root index, cyclic shift, preamble length, parameter design, or timing.

[0114] Upon receiving an instruction for interference coordination, the second IAB node may take various actions to participate in the interference coordination procedure. For example, the second IAB node may modify the TX configuration (previously defined) of its DU or one or more child nodes (e.g., MT or UE). In some cases, the second IAB node may send, directly or in a broadcast message (e.g., SIB1), one or more PM priority levels to the first IAB node (or CU) or instruct child nodes to send (e.g., the second IAB node or the child nodes).

[0115] In some scenarios, upon receiving an instruction for interference coordination, the second IAB node may send the IDs of one or more cells of the first IAB node DU, or the identifier of the first IAB node, to the CU. These IDs may allow the CU to perform interference coordination with the first IAB node or request additional information about the first IAB node. In some cases, the second IAB node may send such IDs to the child node (MT / UE), for example, as a request to perform a measurement for an indicated PCI.

[0116] In some cases, configurable nodes can transmit instructions for interference coordination, detection instructions, or take action in response to instructions. For example, the configuration for transmitting instructions or taking action upon receiving instructions can be indicated by the CU via Radio Resource Control (RRC) signaling or via F1 Application Protocol (F1AP) messages.

[0117] As mentioned above, a potential challenge in IAB networks is how to address interference caused by transmissions from one node to other nodes. Aspects of this disclosure utilize Synchronization Signaling Block (SSB) discovery and Random Access Channel (RACH) mechanisms to provide interference coordination between potentially interfering radio nodes in an IAB network. In some cases, indications of interference coordination can be used as an effective mechanism for sharing power management priority values ​​between (child / parent) nodes, which are used to determine which nodes should adjust their transmission (TX) configurations to minimize interference to other nodes.

[0118] One advantage of using existing mechanisms for interference coordination is that certain procedures can be reused or modified for efficient implementation. Another advantage of using discovery and RACH mechanisms for interference coordination is that by monitoring directed SSB transmissions to detect another (potential interference node), the corresponding RACH timing can be used to provide the other node with an indication of interference coordination. Because the RACH timing is associated with SSB transmissions, the other node knows which resources to monitor, when, and in what direction to monitor for indication (since the other node is already monitoring those resources for RACH transmissions).

[0119] As described herein, aspects of this disclosure utilize Synchronization Signaling Block (SSB) discovery and Random Access Channel (RACH) mechanisms to provide interference coordination between (potentially interfering) radio nodes in an IAB network. Utilizing existing mechanisms for interference coordination in this manner could lead to efficient implementations, for example, allowing certain existing procedures to be reused or adapted to instruct interference coordination between nodes without the need for established connections (and without the involvement of the CU).

[0120] In addition to the aspects described above, many other aspects of a particular combination are also within the scope of this disclosure, some of which are described in detail below:

[0121] Aspect 1: A method for wireless communication by a first wireless node, comprising: determining resources for transmitting an indication of interference coordination to a second wireless node; and transmitting the indication to the second wireless node using the determined resources as part of an interference coordination procedure.

[0122] Aspect 2: The method of aspect 1, wherein: the determination is based on the Synchronization Signal Block (SSB) Transmission Configuration (STC); and the indication is transmitted from the first radio node via the SSB transmission according to the STC.

[0123] Aspect 3: The method of aspect 2, wherein the SSB transmission is sent within a window defined by the STC, which is aligned with the SSB Measurement Timing Configuration (SMTC) window of the second wireless node.

[0124] Aspect 4: The method of any of Aspects 1-3, wherein the indication is designed to prompt the second wireless node to communicate with the third wireless node as part of the interference coordination procedure.

[0125] Aspect 5: The method of any of Aspects 1-4, wherein the determination is based on: detecting a first synchronization signal block (SSB) from a second wireless node; and identifying at least one first random access channel (RACH) timing associated with the first SSB.

[0126] Aspect 6: The method of aspect 5, wherein the at least one first RACH timing is identified based on the RACH configuration broadcast by the second radio node.

[0127] Aspect 7: The method of any of Aspects 1-6, wherein the indication is implicitly transmitted via a transmit power configuration used to transmit the RACH preamble.

[0128] Aspect 8: The method of aspect 7, wherein the RACH preamble is transmitted using a transmit power setting designed such that the RACH preamble will be received at a target receive power greater than that indicated in the RACH configuration.

[0129] Aspect 9: The method of any of Aspects 1-8, wherein the indication is explicitly sent via the payload of a RACH message.

[0130] Aspect 10: The method of aspect 5, wherein the indication is implicitly sent via at least one of: at least one first RACH timing identified; or a resource used to send the indication.

[0131] Aspect 11: The method of aspect 5 further includes: detecting a second SSB transmitted from a second radio node; identifying a second RACH timing associated with the second SSB; and using the resources of the second RACH timing to send a second indication to the second radio node as part of the interference coordination procedure.

[0132] Aspect 12: The method of any of Aspects 1-11, wherein the second instruction is transmitted via at least one of: a RACH preamble format; or a combination of different RACH preamble formats.

[0133] Aspect 13: The method of aspect 12, wherein the second instruction is sent via at least one of the following: the root index of the RACH preamble format, the cyclic shift, the preamble length, the parameter design, or the timing.

[0134] Aspect 14: The method of aspect 5, wherein the indication conveys at least one of the following: a channel quality metric between the first wireless node and the second wireless node; or an estimate of the path loss (PL) between the first wireless node and the second wireless node in the direction associated with the first SSB.

[0135] Aspect 15: A method of any of Aspects 1-14, wherein the indication conveys at least one of the following: the power management priority level of the first wireless node; the ID of the first wireless node or one or more cells served by the first wireless node; or auxiliary information indicating how the second wireless node can modify the transmission configuration associated with communications performed by the second wireless node.

[0136] Aspect 16: The method of aspect 15, wherein the transmission configuration indicates at least one of the following: transmission power or power range, transmission periodicity, number of transmission opportunities per cycle, frequency domain resources, or beam configuration.

[0137] Aspect 17: The method of aspect 5, wherein the instruction requests the second wireless node to perform power backoff at least in the direction associated with the first SSB.

[0138] Aspect 18: The method of any of Aspects 1-17 further includes: receiving a configuration for transmitting the indication via at least one of Radio Resource Control (RRC) signaling or application protocol messages.

[0139] Aspect 19: A method for wireless communication by a first wireless node, comprising: detecting an indication for interference coordination transmitted from a second wireless node as part of an interference coordination procedure; and participating in an interference coordination procedure with the second wireless node based on the indication.

[0140] Aspect 20: The method of aspect 19, wherein the indication is detected via a synchronization signal block (SSB) transmission from a second wireless node.

[0141] Aspect 21: The method of aspect 20, wherein the SSB transmission is detected within the SSB Measurement Timing Configuration (SMTC) window of the first wireless node, which is aligned with the SSB Transmission Configuration (STC) window of the second wireless node.

[0142] Aspect 22: The method of any of Aspects 19-21, wherein the participant includes communicating with a third wireless node.

[0143] Aspect 23: The method of any of Aspects 19-22 further includes: transmitting a synchronization signal block (SSB) in different directions, wherein the indication is transmitted from a second radio node using resources of at least one first random access channel (RACH) timing associated with a first SSB of these SSBs.

[0144] Aspect 24: The method of aspect 23 further includes: broadcasting a RACH configuration defining the at least one first RACH timing.

[0145] Aspect 25: The method of any of Aspects 19-24, wherein the indication is detected based on the transmit power configuration used by the second wireless node to transmit the RACH preamble.

[0146] Aspect 26: The method of aspect 25, wherein the RACH preamble is detected with a received power greater than the target received power indicated in the RACH configuration.

[0147] Aspect 27: The method of any of Aspects 19-26, wherein the indication is detected via the payload of the RACH message.

[0148] Aspect 28: The method of aspect 23, wherein the indication is detected based on at least one of: at least one first RACH timing in which the indication is sent; or the resource used to send the indication.

[0149] Aspect 29: The method of aspect 23 further includes: detecting from the second radio node a second indication transmitted as part of the interference coordination procedure using resources of at least one second RACH timing associated with the second SSB among these SSBs.

[0150] Aspect 30: The method of aspect 23, wherein the indication is detected based on at least one of the following: RACH preamble format; or a combination of different RACH preamble formats.

[0151] Aspect 31: The method of aspect 30, wherein different RACH preamble formats may differ in at least one of the following: the root index of the RACH preamble, the cyclic shift, the preamble length, the parameter design, or the timing.

[0152] Aspect 32: The method of aspect 23, wherein the indication conveys at least one of the following: a channel quality metric between the first wireless node and the second wireless node; or an estimate of the path loss (PL) between the first wireless node and the second wireless node in the direction associated with the first SSB.

[0153] Aspect 33: A method of any of Aspects 19-32, wherein the indication conveys at least one of the following: the power management priority level of the second wireless node; the ID of the second wireless node or one or more cells served by the second wireless node; or auxiliary information indicating how the first wireless node can modify the transmission configuration associated with communications performed by the first wireless node.

[0154] Aspect 34: The method of aspect 33, wherein the transmission configuration indicates at least one of the following: transmission power or power range, transmission periodicity, number of transmission opportunities per period, frequency domain resources, or beam configuration.

[0155] Aspect 35: The method of aspect 23, wherein: the instruction requests the first wireless node to perform power backoff at least in the direction associated with the first SSB; and the participation includes performing the power backoff.

[0156] Aspect 36. The method of aspect 33, wherein the participant includes at least one of: modifying the transmission configuration of at least one of the distributed unit (DU) of the first radio node or the child node of the first radio node; sending one or more power management priority levels of the first radio node or the child node of the first radio node to the second radio node or the centralized unit (CU); instructing the child node of the first radio node to send one or more power management priority levels of the first radio node or the child node of the first radio node to the second radio node or the centralized unit (CU); sending one or more power management priority levels of the first radio node or the child node of the first radio node in a broadcast message; or sending the ID of the second radio node or one or more cells served by the second radio node to the CU or the child node of the first radio node.

[0157] Aspect 37: The method of any of Aspects 19-36 further includes: receiving a configuration for detecting the indication via at least one of Radio Resource Control (RRC) signaling or application protocol messages.

[0158] Aspect 38: An apparatus for wireless communication by a first wireless node, comprising: means for determining resources for transmitting an instruction for interference coordination to a second wireless node; and means for transmitting the determined resources to the second wireless node as part of an interference coordination procedure.

[0159] Aspect 39: The device of aspect 38, wherein: the determination is based on the Synchronization Signal Block (SSB) Transmission Configuration (STC); and the indication is transmitted from the first radio node via the SSB transmission according to the STC.

[0160] Aspect 40: The device as described in Aspect 39, wherein the SSB transmission is sent within a window defined by the STC, which is aligned with the SSB Measurement Timing Configuration (SMTC) window of the second wireless node.

[0161] Aspect 41: The device of any of Aspects 38-40, wherein the indication is designed to prompt the second wireless node to communicate with the third wireless node as part of the interference coordination procedure.

[0162] Aspect 42: An apparatus of any of Aspects 38-41, wherein the determining means comprises: means for detecting a first synchronization signal block (SSB) from a second wireless node; and means for identifying at least one first random access channel (RACH) timing associated with the first SSB.

[0163] Aspect 43: The device of aspect 42, wherein the at least one first RACH timing is identified based on the RACH configuration broadcast by the second wireless node.

[0164] Aspect 44: A device of any of Aspects 38-43, wherein the indication is implicitly transmitted via a transmit power configuration used to transmit the RACH preamble.

[0165] Aspect 45: The device of aspect 44, wherein the RACH preamble is transmitted using a transmit power setting that is designed such that the RACH preamble will be received at a target receive power greater than that indicated in the RACH configuration.

[0166] Aspect 46: A device such as any of Aspects 38-45, wherein the indication is explicitly sent via the payload of a RACH message.

[0167] Aspect 47: The apparatus of aspect 42, wherein the indication is implicitly sent via at least one of: at least one first RACH timing identified; or a resource used to send the indication.

[0168] Aspect 48. The apparatus of aspect 42 further includes: means for detecting a second SSB transmitted from a second wireless node; means for identifying a second RACH timing associated with the second SSB; and means for sending a second indication to the second wireless node using the resources of the second RACH timing as part of the interference coordination procedure.

[0169] Aspect 49: The device as described in aspect 48, wherein the second instruction is transmitted via at least one of the following: RACH preamble format; or a combination of different RACH preamble formats.

[0170] Aspect 50: The device as in aspect 49, wherein the second indication is transmitted via at least one of the following: the root index of the RACH preamble format, the cyclic shift, the preamble length, the parameter design, or the timing.

[0171] Aspect 51: The device of aspect 42, wherein the indication conveys at least one of the following: a channel quality metric between the first wireless node and the second wireless node; or an estimate of the path loss (PL) between the first wireless node and the second wireless node in the direction associated with the first SSB.

[0172] Aspect 52: A device of any of Aspects 38-51, wherein the indication conveys at least one of the following: the power management priority level of the first wireless node; the ID of the first wireless node or one or more cells served by the first wireless node; or auxiliary information indicating how the second wireless node can modify the transmission configuration associated with communications performed by the second wireless node.

[0173] Aspect 53: The device as described in aspect 52, wherein the transmission configuration indicates at least one of the following: transmission power or power range, transmission periodicity, number of transmission opportunities per period, frequency domain resources, or beam configuration.

[0174] Aspect 54: The device as in aspect 42, wherein the instruction requests the second wireless node to perform power backoff at least in the direction associated with the first SSB.

[0175] Aspect 55: The apparatus of any of Aspects 38-54 further includes: means for outputting a configuration for transmitting the indication via at least one of Radio Resource Control (RRC) signaling or application protocol messages.

[0176] Aspect 56: An apparatus for wireless communication by a first wireless node, comprising: means for detecting an indication for interference coordination transmitted from a second wireless node as part of an interference coordination procedure; and means for participating in an interference coordination procedure with the second wireless node based on the indication.

[0177] Aspect 57: The device as described in aspect 56, wherein the indication is detected via a synchronization signal block (SSB) transmission from a second wireless node.

[0178] Aspect 58: The device as described in Aspect 57, wherein the SSB transmission is detected within the SSB Measurement Timing Configuration (SMTC) window of the first wireless node, which is aligned with the SSB Transmission Configuration (STC) window of the second wireless node.

[0179] Aspect 59: The device of any of Aspects 56-58, wherein the participating device includes means for communicating with a third wireless node.

[0180] Aspect 60: The apparatus of any of Aspects 56-59 further includes: means for outputting a synchronization signal block (SSB) for transmission in different directions, wherein the indication is transmitted from a second radio node using resources of at least one first random access channel (RACH) timing associated with a first SSB of these SSBs.

[0181] Aspect 61: The method of aspect 60 further includes: means for outputting a RACH configuration that defines at least one first RACH timing for broadcasting.

[0182] Aspect 62: A device of any of Aspects 56-61, wherein the indication is detected based on the transmit power configuration used by the second wireless node to transmit the RACH preamble.

[0183] Aspect 63: The device as described in aspect 62, wherein the RACH preamble is detected with a received power greater than the target received power indicated in the RACH configuration.

[0184] Aspect 64: A device such as any of Aspects 56-63, wherein the indication is detected via the payload of a RACH message.

[0185] Aspect 65: The device of aspect 60, wherein the indication is detected based on at least one of: at least one first RACH timing in which the indication is sent; or the resource used to send the indication.

[0186] Aspect 66: The apparatus of aspect 60 further includes: means for detecting from the second radio node a second indication transmitted as part of the interference coordination procedure using resources of at least one second RACH timing associated with the second SSB among these SSBs.

[0187] Aspect 67: The device of aspect 60, wherein the indication is detected based on at least one of the following: RACH preamble format; or a combination of different RACH preamble formats.

[0188] Aspect 68: As in aspect 67, different RACH preamble formats may differ in at least one of the following: the root index of the RACH preamble, the cyclic shift, the preamble length, the parameter design, or the timing.

[0189] Aspect 69: The apparatus of aspect 60, wherein the indication conveys at least one of the following: a channel quality metric between the first wireless node and the second wireless node; or an estimate of the path loss (PL) between the first wireless node and the second wireless node in the direction associated with the first SSB.

[0190] Aspect 70: A device of any of Aspects 56-69, wherein the indication conveys at least one of the following: the power management priority level of the second wireless node; the ID of the second wireless node or one or more cells served by the second wireless node; or auxiliary information indicating how the first wireless node can modify the transmission configuration associated with communications performed by the first wireless node.

[0191] Aspect 71: The device of aspect 70, wherein the transmission configuration indicates at least one of the following: transmission power or power range, transmission periodicity, number of transmission opportunities per period, frequency domain resources, or beam configuration.

[0192] Aspect 72: The apparatus of aspect 60, wherein: the instruction requests the first wireless node to perform power backoff at least in the direction associated with the first SSB; and the participation includes performing the power backoff.

[0193] Aspect 73: The apparatus of aspect 70, wherein the participating means includes at least one of the following: means for modifying the transmission configuration of at least one of the distributed unit (DU) of the first wireless node or the child node of the first wireless node; means for outputting one or more power management priority levels of the first wireless node or the child node of the first wireless node for transmission to a second wireless node or a centralized unit (CU); means for instructing the child node of the first wireless node to send one or more power management priority levels of the first wireless node or the child node of the first wireless node to the second wireless node or the centralized unit (CU); means for outputting one or more power management priority levels of the first wireless node or the child node of the first wireless node for transmission in a broadcast message; or means for outputting the ID of the second wireless node or one or more cells served by the second wireless node for transmission to the CU or the child node of the first wireless node.

[0194] Aspect 74: The apparatus of any of Aspects 56-73 further includes: means for obtaining a configuration for detecting the indication via at least one of Radio Resource Control (RRC) signaling or application protocol messages.

[0195] Aspect 75: An apparatus for wireless communication by a first wireless node, comprising: a processing system configured to determine resources for transmitting an indication of interference coordination to a second wireless node; and an interface configured to output the indication to the second wireless node for transmission using the determined resources as part of an interference coordination procedure.

[0196] Aspect 76: The apparatus of aspect 75, wherein the determination is based on the Synchronization Signal Block (SSB) Transmission Configuration (STC); and the indication is transmitted from the first radio node via the SSB transmission according to the STC.

[0197] Aspect 77: An apparatus as in any of Aspect 76, wherein the SSB transmission is sent within a window defined by the STC, which is aligned with the SSB Measurement Timing Configuration (SMTC) window of the second wireless node.

[0198] Aspect 78: An apparatus as described in any of Aspects 75-77, wherein the indication is designed to prompt the second wireless node to communicate with the third wireless node as part of the interference coordination procedure.

[0199] Aspect 79: An apparatus of any of Aspects 75-78, wherein the determination is based on: detecting a first synchronization signal block (SSB) from a second wireless node; and identifying at least one first random access channel (RACH) timing associated with the first SSB.

[0200] Aspect 80: The apparatus of aspect 79, wherein the at least one first RACH timing is identified based on a RACH configuration broadcast by a second wireless node.

[0201] Aspect 81: A device as in any of Aspects 75-80, wherein the indication is implicitly transmitted via a transmit power configuration used to transmit the RACH preamble.

[0202] Aspect 82: The apparatus of aspect 81, wherein the RACH preamble is transmitted using a transmit power setting designed such that the RACH preamble will be received at a target receive power greater than that indicated in the RACH configuration.

[0203] Aspect 83: An apparatus as in any of Aspects 75-82, wherein the indication is explicitly sent via the payload of a RACH message.

[0204] Aspect 84: The apparatus of aspect 79, wherein the instruction is implicitly transmitted via at least one of: at least one first RACH timing identified; or a resource used to transmit the instruction.

[0205] Aspect 85: The apparatus of aspect 79, wherein the processing system is further configured to: detect a second SSB transmitted from a second radio node; identify a second RACH timing associated with the second SSB; and use the resources of the second RACH timing to send a second indication to the second radio node as part of the interference coordination procedure.

[0206] Aspect 86: An apparatus of any of aspects 75-85, wherein the second instruction is transmitted via at least one of: a RACH preamble format; or a combination of different RACH preamble formats.

[0207] Aspect 87: The apparatus of aspect 86, wherein the second indication is transmitted via at least one of the following: the root index of the RACH preamble format, the cyclic shift, the preamble length, the parameter design, or the timing.

[0208] Aspect 88: The apparatus of aspect 79, wherein the indication conveys at least one of the following: a channel quality metric between the first wireless node and the second wireless node; or an estimate of the path loss (PL) between the first wireless node and the second wireless node in the direction associated with the first SSB.

[0209] Aspect 89: An apparatus of any of Aspects 75-88, wherein the indication conveys at least one of the following: the power management priority level of the first wireless node; the ID of the first wireless node or one or more cells served by the first wireless node; or auxiliary information indicating how the second wireless node can modify the transmission configuration associated with communications performed by the second wireless node.

[0210] Aspect 90: The apparatus of aspect 89, wherein the transmission configuration indicates at least one of the following: transmission power or power range, transmission periodicity, number of transmission opportunities per cycle, frequency domain resources, or beam configuration.

[0211] Aspect 91: The apparatus of aspect 79, wherein the instruction requests the second wireless node to perform power backoff at least in the direction associated with the first SSB.

[0212] Aspect 92: The apparatus of any of aspects 75-91 further includes an interface configured to obtain a configuration for transmitting the indication via at least one of radio resource control (RRC) signaling or application protocol messages.

[0213] Aspect 93: An apparatus for wireless communication by a first wireless node, comprising: a processing system configured to: detect an indication for interference coordination transmitted from a second wireless node as part of an interference coordination procedure; and participate in an interference coordination procedure with the second wireless node based on the indication.

[0214] Aspect 94: The apparatus of aspect 93, wherein the indication is detected via a synchronization signal block (SSB) transmission from a second wireless node.

[0215] Aspect 95: The apparatus of aspect 94, wherein the SSB transmission is detected within the SSB Measurement Timing Configuration (SMTC) window of the first wireless node, which is aligned with the SSB Transmission Configuration (STC) window of the second wireless node.

[0216] Aspect 96: An apparatus of any of aspects 93-95, wherein the participation includes communicating with a third wireless node.

[0217] Aspect 97: An apparatus of any of aspects 93-96 further includes: an interface configured to output a synchronization signal block (SSB) for transmission in different directions, wherein the indication is transmitted from a second radio node using resources of at least one first random access channel (RACH) timing associated with a first SSB of these SSBs.

[0218] Aspect 98: The apparatus of aspect 97, wherein the interface is further configured to output a RACH configuration defining at least one first RACH timing for broadcasting.

[0219] Aspect 99: A device as described in any of Aspects 93-98, wherein the indication is detected based on the transmit power configuration used by the second wireless node to transmit the RACH preamble.

[0220] Aspect 100: The apparatus of aspect 99, wherein the RACH preamble is detected with a received power greater than the target received power indicated in the RACH configuration.

[0221] Aspect 101: A device as described in any of Aspects 93-100, wherein the indication is detected via the payload of a RACH message.

[0222] Aspect 102: The apparatus of aspect 97, wherein the indication is detected based on at least one of the following: the at least one first RACH timing in which the indication is sent; or the resource used to send the indication.

[0223] Aspect 103: The apparatus of aspect 97, wherein the processing system is further configured to: detect from the second radio node a second instruction transmitted as part of the interference coordination procedure using resources of at least one second RACH timing associated with the second SSB among these SSBs.

[0224] Aspect 104: An apparatus of any of Aspects 93-103, wherein the indication is detected based on at least one of: a RACH preamble format; or a combination of different RACH preamble formats.

[0225] Aspect 105: The apparatus of aspect 104, wherein different RACH preamble formats may differ in at least one of the following: the root index of the RACH preamble, the cyclic shift, the preamble length, the parameter design, or the timing.

[0226] Aspect 106: The apparatus of aspect 97, wherein the indication conveys at least one of the following: a channel quality metric between the first wireless node and the second wireless node; or an estimate of the path loss (PL) between the first wireless node and the second wireless node in the direction associated with the first SSB.

[0227] Aspect 107: An apparatus of any of Aspects 93-106, wherein the indication conveys at least one of the following: the power management priority level of the second wireless node; the ID of the second wireless node or one or more cells served by the second wireless node; or auxiliary information indicating how the first wireless node can modify the transmission configuration associated with communications performed by the first wireless node.

[0228] Aspect 108: The apparatus of aspect 107, wherein the transmission configuration indicates at least one of the following: transmission power or power range, transmission periodicity, number of transmission opportunities per cycle, frequency domain resources, or beam configuration.

[0229] Aspect 109: The apparatus of aspect 97, wherein: the instruction requests the first wireless node to perform power backoff at least in the direction associated with the first SSB; and the participation includes performing the power backoff.

[0230] Aspect 110: The apparatus of aspect 107, wherein the participant includes at least one of: modifying the transmission configuration of at least one of the distributed unit (DU) of the first wireless node or the child node of the first wireless node; providing one or more power management priority levels of the first wireless node or the child node of the first wireless node for transmission to the second wireless node or the centralized unit (CU); instructing the child node of the first wireless node to send one or more power management priority levels of the first wireless node or the child node of the first wireless node to the second wireless node or the centralized unit (CU); providing one or more power management priority levels of the first wireless node or the child node of the first wireless node for transmission in a broadcast message; or providing the ID of the second wireless node or one or more cells served by the second wireless node for transmission to the CU or the child node of the first wireless node.

[0231] Aspect 111: The apparatus of any of aspects 93-110 further includes an interface configured to obtain a configuration for detecting the indication via at least one of radio resource control (RRC) signaling or application protocol messages.

[0232] Aspect 112: A first wireless node, comprising: a processing system configured to determine resources for transmitting an instruction for interference coordination to a second wireless node; and a transmitter configured to transmit the instruction to the second wireless node using the determined resources as part of an interference coordination procedure.

[0233] Aspect 113: A first wireless node, comprising: at least one antenna; and a processing system configured to detect, via the at least one antenna, an instruction for interference coordination transmitted from a second wireless node as part of an interference coordination procedure; and to participate in an interference coordination procedure with the second wireless node based on the instruction.

[0234] Aspect 114: A computer-readable medium for wireless communication, comprising code executable to: determine resources for transmitting an indication of interference coordination to a second wireless node; and output the determined indication to the second wireless node for transmission as part of an interference coordination procedure using the determined resources.

[0235] 115. A computer-readable medium for wireless communication, comprising code executable to: detect an instruction for interference coordination transmitted from a second wireless node as part of an interference coordination procedure; and participate in an interference coordination procedure with the second wireless node based on the instruction.

[0236] The techniques described in this article can be used in a variety of wireless communication technologies, such as 3GPP Long Term Evolution (LTE), LTE-A Advanced (LTE-A), Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), Time Division Synchronous Code Division Multiple Access (TD-SCDMA), and other networks. The terms "network" and "system" are often used interchangeably.

[0237] CDMA networks can implement radio technologies such as Universal Terrestrial Radio Access (UTRA) and cdma2000. UTRA includes Wideband CDMA (WCDMA) and other CDMA variants. cdma2000 covers the IS-2000, IS-95, and IS-856 standards. TDMA networks can implement radio technologies such as Global System for Mobile Communications (GSM). OFDMA networks can implement radio technologies such as NR (e.g., 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, and Flash-OFDMA. UTRA and E-UTRA are parts of the Universal Mobile Telecommunications System (UMTS). LTE and LTE-A are UMTS versions that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization called the 3rd Generation Partnership Project (3GPP). cdma2000 and UMB are described in documents from an organization called “3rd Generation Partnership Project 2” (3GPP2).

[0238] The techniques described herein can be used in the wireless networks and radio technologies mentioned above, as well as other wireless networks and radio technologies. For clarity, although aspects may be described herein using terms commonly associated with 3G, 4G, and / or 5G wireless technologies, aspects of this disclosure can be applied to communication systems based on other generations.

[0239] New Radio (NR) is an emerging wireless communication technology being developed in collaboration with the 5G Technology Forum (5GTF). NR access (e.g., 5G NR) can support a variety of wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g., 80 MHz or higher), millimeter wave (mmW) targeting high carrier frequencies (e.g., 25 GHz or higher), massive machine-type communication (mMTC) targeting non-backward-compatible MTC technologies, and / or mission-critical communication targeting ultra-reliable low latency communication (URLLC). These services may include latency and reliability requirements. These services may also have different Transmission Time Intervals (TTIs) to meet corresponding Quality of Service (QoS) requirements. Furthermore, these services can coexist in the same subframe.

[0240] In 3GPP, the term "cell" can refer to the coverage area of ​​a B-node (NB) and / or the NB subsystem serving that coverage area, depending on the context in which the term is used. In NR systems, the terms "cell" and BS, next-generation B-node (gNB or g B-node), access point (AP), distributed cell (DU), carrier, or transmit / receive point (TRP) can be used interchangeably. A BS can provide communication coverage for macrocells, picocells, femtocells, and / or other types of cells. A macrocell can cover a relatively large geographic area (e.g., a radius of several kilometers) and allows unrestricted access by UEs with a service subscription. A picocell can cover a relatively small geographic area and allows unrestricted access by UEs with a service subscription. A femtocell can cover a relatively small geographic area (e.g., a residential area) and allows restricted access by UEs associated with that femtocell (e.g., UEs in a closed subscriber group (CSG), UEs of users in a residential area, etc.). A BS used for a macrocell can be referred to as a macro BS. A BS used for picocells can be called a picoBS. A BS used for femtocells can be called a femtoBS or a home BS.

[0241] A UE can also be referred to as a mobile station, terminal, access terminal, subscriber unit, station, customer premises equipment (CPE), cellular phone, smartphone, personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop computer, cordless phone, wireless local loop (WLL) station, tablet computer, camera, gaming device, netbook, smartbook, ultrabook, appliance, medical device or medical equipment, biometric sensor / device, wearable device (such as smartwatch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet, etc.)), entertainment device (e.g., music device, video device, satellite radio, etc.), vehicle component or sensor, smart meter / sensor, industrial manufacturing equipment, GPS device, or any other suitable device configured to communicate via wireless or wired media. Some UEs may be considered machine-type communication (MTC) devices or evolved MTC (eMTC) devices. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a BS, another device (e.g., a remote device), or another entity. Wireless nodes can provide connectivity to or to a network (e.g., a wide area network such as the Internet) or a cellular network, for example, via wired or wireless communication links. Some UEs can be considered Internet of Things (IoT) devices, which can be narrowband IoT (NB-IoT) devices.

[0242] Some wireless networks (e.g., LTE) utilize Orthogonal Frequency Division Multiplexing (OFDM) on the downlink and Single-Carrier Frequency Division Multiplexing (SC-FDM) on the uplink. OFDM and SC-FDM divide the system bandwidth into multiple (K) orthogonal subcarriers, often referred to as frequency modulation, frequency slots, etc. Each subcarrier can be modulated with data. Generally, modulation symbols are transmitted in the frequency domain for OFDM and in the time domain for SC-FDM. The spacing between adjacent subcarriers can be fixed, and the total number of subcarriers (K) can depend on the system bandwidth. For example, the subcarrier spacing could be 15 kHz, and the minimum resource allocation (called a "resource block" (RB)) could be 12 subcarriers (or 180 kHz). Therefore, for system bandwidths of 1.25, 2.5, 5, 10, or 20 MHz, the nominal Fast Fourier Transform (FFT) size could be 128, 256, 512, 1024, or 2048, respectively. The system bandwidth can also be divided into subbands. For example, a subband can cover 1.8 MHz (e.g., 6 RBs), and for system bandwidths of 1.25, 2.5, 5, 10, or 20 MHz, there can be 1, 2, 4, 8, or 16 subbands, respectively. In LTE, the basic transmission time interval (TTI) or packet duration is a 1 ms subframe.

[0243] NR can utilize OFDM with CP on both uplink and downlink and includes support for half-duplex operation using TDD. In NR, a subframe is still 1ms, but the basic TTI is called a slot. A subframe contains a variable number of slots (e.g., 1, 2, 4, 8, 16... slots) depending on the subcarrier spacing. NR RB is 12 coherent frequency subcarriers. NR supports a base subcarrier spacing of 15kHz and other subcarrier spacings can be defined relative to the base subcarrier spacing, such as 30kHz, 60kHz, 120kHz, 240kHz, etc. Symbol and slot lengths scale with the subcarrier spacing. The CP length also depends on the subcarrier spacing. Beamforming is supported and beam direction can be dynamically configured. MIMO transmission with precoding is also supported. In some examples, MIMO configurations in DL can support up to 8 transmit antennas (with up to 8 streams in multilayer DL transmission) and up to 2 streams per UE. In some examples, multi-layer transport of up to two streams per UE can be supported. Up to eight serving cells can be used to support aggregation of multiple cells.

[0244] In some examples, access to the air interface can be scheduled. A scheduling entity (e.g., a BS) allocates resources for communication among some or all devices and equipment within its service area or cell. The scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, the subordinate entity utilizes the resources allocated by the scheduling entity. A base station is not the only entity that can be used as a scheduling entity. In some examples, a UE may act as a scheduling entity and can schedule resources for one or more subordinate entities (e.g., one or more other UEs), and other UEs may utilize the resources scheduled by that UE for wireless communication. In some examples, a UE may act as a scheduling entity in a peer-to-peer (P2P) network and / or in a mesh network. In the mesh network example, UEs may communicate directly with each other in addition to communicating with a scheduling entity.

[0245] In some examples, two or more subordinate entities (e.g., UEs) may use sidelink signaling to communicate with each other. Real-world applications of such sidelink communication may include public safety, proximity services, UE-to-network relay, vehicle-to-vehicle (V2V) communication, Internet of Things (IoE) communication, IoT communication, mission-critical mesh networks, and / or various other suitable applications. Generally, sidelink signaling can refer to a signal that is relayed from one subordinate entity (e.g., UE1) to another subordinate entity (e.g., UE2) without requiring the relaying of that communication by a scheduling entity (e.g., UE or BS), even if the scheduling entity may be used for scheduling and / or control purposes. In some examples, sidelink signaling may be transmitted using licensed spectrum (unlike wireless LANs, which typically use unlicensed spectrum).

[0246] The methods disclosed herein include one or more steps or actions for implementing the method. These method steps and / or actions may be interchanged without departing from the scope of the claims. In other words, unless a specific order of steps or actions is specified, the order and / or use of specific steps and / or actions may be modified without departing from the scope of the claims.

[0247] As used herein, the phrase “at least one of” a list of items refers to any combination of those items, including a single member. As an example, “at least one of a, b, or c” is intended to cover: a, b, c, ab, ac, bc, and abc, as well as any combination with multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbb, bbc, cc, and ccc, or any other ordering of a, b, and c).

[0248] As used herein, the term "determine" encompasses a wide variety of actions. For example, "determine" can include calculation, computation, processing, derivation, research, searching (e.g., looking in a table, database, or other data structure), ascertaining, and the like. Furthermore, "determine" can include receiving (e.g., receiving information), accessing (e.g., accessing data in memory), and the like. Moreover, "determine" can include parsing, selecting, choosing, building, and the like.

[0249] The preceding description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will readily be understood by those skilled in the art, and the universal principles defined herein may be applied to other aspects. Therefore, the claims are not intended to be limited to the aspects shown herein, but are to be granted the full scope consistent with the language of the claims, wherein references to the singular form of an element are not intended to mean “one and only one” (unless specifically stated otherwise) but “one or more.” Unless specifically stated otherwise, the term “some / a” refers to one or more. All structural and functional equivalents of the aspects described throughout this disclosure that are now or hereafter known to a person skilled in the art are expressly incorporated herein by reference and are intended to be covered by the claims. Furthermore, nothing disclosed herein is intended to be donated to the public, whether or not such disclosure is expressly stated in the claims. No element of a claim should be interpreted in accordance with the provisions of 35 U.S.SC §112(f) unless the element is expressly stated using the phrase “means for…” or, in the case of a method claim, the element is stated using the phrase “steps for…”.

[0250] The various operations of the methods described above can be performed by any suitable means capable of performing the corresponding functions. These means may include various hardware and / or software components and / or modules, including but not limited to circuits, application-specific integrated circuits (ASICs), or processors. Generally, where the operations illustrated in the figures are present, these operations may have corresponding paired means plus functional components. For example, Figure 2 The processors 266, 258, 264 and / or controller / processor 280 of UE120 shown, and / or the processors 220, 230, 238 and / or controller / processor 240 of BS 110, can be configured to perform respectively Figure 7 and 8 Operations 700 and 800.

[0251] The receiving device may include Figure 2 The receiver (such as one or more antennas or a receiver processor) described herein. The means for transmitting or sending may include... Figure 2The transmitter (such as one or more antennas or a transmission processor) described herein. The means for determining, for detecting, for identifying, for using, for participating, for communicating, for instructing, and for modifying may include a processing system, which may include one or more processors, such as... Figure 2 The processors 266, 258, 264 of the UE 120 and / or the controller / processor 280, and / or the processors 220, 230, 238 of the BS 110 and / or the controller / processor 240 are shown.

[0252] In some cases, a device may not actually transmit or send frames, but may have an interface (means for outputting) for outputting frames for transmission. For example, a processor may output frames to a radio frequency (RF) front end for transmission via a bus interface. Similarly, a device may not actually receive frames, but may have an interface (means for receiving) for obtaining frames received from another device. For example, a processor may obtain (or receive) frames from an RF front end via a bus interface for reception.

[0253] The various illustrative logic blocks, modules, and circuits described in this disclosure can be implemented or executed using a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but in alternatives, the processor may be any commercially available processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors cooperating with a DSP core, or any other such configuration.

[0254] If implemented in hardware, an example hardware configuration may include a processing system in a wireless node. The processing system can be implemented using a bus architecture. Depending on the specific application and overall design constraints of the processing system, the bus may include any number of interconnect buses and bridges. The bus can link together various circuits, including a processor, machine-readable media, and a bus interface. The bus interface can be used to connect network adapters, etc., to the processing system via the bus. The network adapter can be used to implement signal processing functions at the PHY layer. In user terminal 120 (see...) Figure 1In such cases, the user interface (e.g., keypad, display, mouse, joystick, etc.) can also be connected to the bus. The bus can also link various other circuits (such as timing sources, peripherals, voltage regulators, power management circuits, etc.), which are well known in the art and will therefore not be described further. The processor can be implemented using one or more general-purpose and / or special-purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuit systems capable of executing software. Depending on the specific application and the overall design constraints imposed on the system, those skilled in the art will recognize how best to implement the functionality described for the processing system. For example, in some cases, the processor (such as...) Figure 2 Those processors shown can be configured to execute Figure 7 Operation 700 Figure 8 Operation 800, and / or Operation 900 of Figure 9.

[0255] If implemented in software, the functions can be stored or transmitted as one or more instructions or codes on a computer-readable medium. Software should be broadly interpreted to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. Computer-readable media includes both computer storage media and communication media, encompassing any medium that facilitates the transfer of a computer program from one location to another. The processor may be responsible for managing the bus and general processing, including executing software modules stored on the machine-readable storage medium. The computer-readable storage medium may be coupled to the processor so that the processor can read and write information to / from the storage medium. Alternatively, the storage medium may be integrated into the processor. As an example, the machine-readable medium may include a transmission line, a data-modulated carrier wave, and / or a separate computer-readable storage medium containing instructions stored thereon, all accessible to the processor via a bus interface. Alternatively or additionally, the machine-readable medium or any portion thereof may be integrated into the processor, such as caches and / or general-purpose register files. As an example, examples of machine-readable storage media may include RAM (random access memory), flash memory, ROM (read-only memory), PROM (programmable read-only memory), EPROM (erasable programmable read-only memory), EEPROM (electrically erasable programmable read-only memory), registers, disks, optical disks, hard drives, or any other suitable storage media, or any combination thereof. Machine-readable media may be implemented in computer program products.

[0256] Software modules may comprise a single instruction or a number of instructions, and may be distributed across several different code segments, across different programs, and across multiple storage media. Computer-readable media may include several software modules. These software modules include instructions that, when executed by an instrument (such as a processor), enable the processing system to perform various functions. These software modules may include transfer modules and receive modules. Each software module may reside in a single storage device or be distributed across multiple storage devices. As an example, when a trigger event occurs, a software module may be loaded from a hard drive into RAM. During the execution of a software module, the processor may load some instructions into a cache to improve access speed. One or more cache lines may subsequently be loaded into a general-purpose register file for processor execution. In the context of the functionality of a software module described below, it will be understood that such functionality is implemented by the processor when the processor executes the instructions from that software module.

[0257] Similarly, any connection is also legitimately referred to as computer-readable medium. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technology (such as infrared (IR), radio, and microwave), then that coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technology (such as infrared, radio, and microwave) is included in the definition of medium. As used herein, disks and discs include compact discs (CDs), laser discs, optical discs, digital multi-purpose discs (DVDs), floppy disks, and... Disks, where disks often magnetically reproduce data, and discs optically reproduce data using lasers. Therefore, in some aspects, computer-readable media may include non-transient computer-readable media (e.g., tangible media). Additionally, in other aspects, computer-readable media may include transient computer-readable media (e.g., signals). Combinations of the above should also be included within the scope of computer-readable media.

[0258] Therefore, certain aspects may include computer program products for performing the operations given herein. For example, such computer program products may include computer-readable media on which instructions are stored (and / or encoded) that can be executed by one or more processors to perform the operations described herein. Figure 7 -9 describes the operation instructions.

[0259] Furthermore, it should be understood that modules and / or other suitable means for performing the methods and techniques described herein may be downloaded and / or otherwise obtained by the user terminal and / or base station where applicable. For example, such devices can be coupled to a server to facilitate the transfer of means for performing the methods described herein. Alternatively, the various methods described herein can be provided via a storage device (e.g., RAM, ROM, physical storage media such as CDs or floppy disks, etc.) so that the device can obtain the various methods once the storage device is coupled to or provided to the user terminal and / or base station. Furthermore, any other suitable techniques appropriate for providing the methods and techniques described herein to the device may be utilized.

[0260] It will be understood that the claims are not limited to the precise configurations and components described above. Various modifications, substitutions, and variations may be made to the layout, operation, and details of the methods and apparatus described above without departing from the scope of the claims.

Claims

1. A method for wireless communication by a first wireless node, comprising: Resources for sending an instruction to the second wireless node for interference coordination are determined based on the detection of the first synchronization signal block (SSB) from the second wireless node. as well as The instruction is sent to the second wireless node using the determined resources as part of the interference coordination procedure.

2. The method of claim 1, wherein: The determination is based on the Synchronization Signal Block (SSB) transmission configuration (STC); and The instruction is transmitted from the first wireless node via SSB according to the STC.

3. The method of claim 2, wherein the SSB transmission is sent within a window defined by the STC, the window being aligned with the SSB Measurement Timing Configuration (SMTC) window of the second wireless node.

4. The method of claim 1, wherein the indication is designed to prompt the second wireless node to communicate with the third wireless node as part of the interference coordination procedure.

5. The method of claim 1, wherein the determination is further based on: Identify at least one first random access channel (RACH) timing associated with the first SSB.

6. The method of claim 5, wherein the indication is implicitly transmitted via transmit power configuration used to transmit the RACH preamble.

7. The method of claim 5, wherein the indication is explicitly sent via the payload of a RACH message.

8. The method of claim 5, wherein the instruction is implicitly sent via at least one of the following: At least one first RACH timing identified; or The resource used to send the instruction.

9. The method of claim 5, wherein the instruction is sent via at least one of the following: RACH prefix format; or Combinations of different RACH preamble formats.

10. The method of claim 9, wherein the indication is sent via at least one of: the root index of the RACH preamble format, a cyclic shift, the preamble length, parameter design, or timing.

11. The method of claim 5, wherein the instruction conveys at least one of the following: Channel quality metric between the first wireless node and the second wireless node; or The estimation of path loss (PL) between the first wireless node and the second wireless node in the direction associated with the first SSB.

12. The method of claim 1, wherein the instruction conveys at least one of the following: The power management priority level of the first wireless node; The ID of the first wireless node or one or more cells served by the first wireless node; or Auxiliary information indicating how the second wireless node can modify the transmission configuration associated with the communication performed by the second wireless node.

13. The method of claim 12, wherein the transmission configuration indicates at least one of the following: transmission power or power range, transmission periodicity, number of transmission opportunities per cycle, frequency domain resources, or beam configuration.

14. The method of claim 5, wherein the instruction requests the second wireless node to perform power backoff at least in the direction associated with the first SSB.

15. The method of claim 1, further comprising: Receive configuration for sending the indication via at least one of Radio Resource Control (RRC) signaling or application protocol messages.

16. A method for wireless communication by a first wireless node, comprising: Transmit synchronization signal blocks (SSBs) in different directions; The detection includes an instruction for interference coordination sent from the second radio node as part of an interference coordination procedure, wherein the instruction is sent from the second radio node using resources of at least one first random access channel (RACH) timing associated with the first SSB in the SSB. as well as Based on the instructions, participate in the interference coordination procedure with the second wireless node.

17. The method of claim 16, wherein the indication is detected via a synchronization signal block (SSB) transmission from the second wireless node.

18. The method of claim 17, wherein the SSB transmission is detected within the SSB Measurement Timing Configuration (SMTC) window of the first wireless node, which is aligned with the SSB Transmission Configuration (STC) window of the second wireless node.

19. The method of claim 16, wherein participation includes communicating with a third wireless node.

20. The method of claim 16, wherein the indication is detected based on the transmit power configuration used by the second wireless node to transmit the RACH preamble.

21. The method of claim 16, wherein the indication is detected via the payload of a RACH message.

22. The method of claim 16, wherein the indication is detected based on at least one of the following: The at least one first RACH timing in which the instruction is sent; or The resource used to send the instruction.

23. The method of claim 16, wherein the indication is detected based on at least one of the following: RACH prefix format; or Combinations of different RACH preamble formats.

24. The method of claim 16, wherein the instruction conveys at least one of the following: Channel quality metric between the first wireless node and the second wireless node; or The estimation of path loss (PL) between the first wireless node and the second wireless node in the direction associated with the first SSB.

25. The method of claim 16, wherein the instruction conveys at least one of the following: The power management priority level of the second wireless node; The ID of the second wireless node or one or more cells served by the second wireless node; or Auxiliary information indicating how the first wireless node can modify the transmission configuration associated with the communication performed by the first wireless node.

26. The method of claim 25, wherein the transmission configuration indicates at least one of the following: transmission power or power range, transmission periodicity, number of transmission opportunities per cycle, frequency domain resources, or beam configuration.

27. The method of claim 16, wherein: The instruction requests the first wireless node to perform power backoff at least in the direction associated with the first SSB; and The participation includes performing the power backoff.

28. The method of claim 25, wherein the participation includes at least one of the following: Modify the transmission configuration of at least one of the distributed unit (DU) of the first wireless node or the child node of the first wireless node; Send one or more power management priority levels of the first wireless node or its sub-nodes to the second wireless node or centralized unit (CU); The instruction is given to the child node of the first wireless node to send the power management priority level of the first wireless node or the child node of the first wireless node to the second wireless node or the centralized unit (CU); Send the power management priority level of the first wireless node or the child node of the first wireless node in a broadcast message; or Send the ID of the second wireless node or the one or more cells served by the second wireless node to the CU or the child node of the first wireless node.

29. The method of claim 16, further comprising: Receive configuration for detecting the indication via at least one of Radio Resource Control (RRC) signaling or application protocol messages.

30. A first wireless node, comprising: One or more memories that store executable code for a computer; One or more processors coupled to the one or more memories, the one or more processors being configured to cause the first wireless node to perform the method as described in any one of claims 1-29.

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