Synchronization signal block-based interference measurement

Abstract

Aspects of the present disclosure provide techniques for interference measurement based on synchronization signal blocks (SSB) in a network (e.g., an integrated access backhaul (IAB) network). In some cases, a node determines resources used by at least one parent node of a network for periodic SSB transmissions, performs SSB-based interference measurements using the determined resources, and communicates with at least one of the parent node, a central unit (CU), or another node of the network in accordance with the SSB-based interference measurements.

Description

[0001] This divisional application is a divisional application with application date of December 11, 2020, application number 202080084360.8, and invention name “Interference measurement based on synchronization signal block”.

[0002] CROSS-REFERENCE TO RELATED APPLICATIONS

[0003] This application claims priority to U.S. Application No. 17 / 117,721, filed on December 10, 2020, which claims the benefit of and priority to U.S. Provisional Application No. 62 / 947,892, filed on December 13, 2019, both of which are hereby assigned to the assignee of the present application and are hereby expressly incorporated herein by reference in their entirety, as fully set forth below and for all applicable purposes. Technical Field

[0004] Aspects of the present disclosure relate to wireless communications, and more particularly to techniques for interference measurement based on synchronization signal blocks (SSBs), such as in an integrated access backhaul (IAB) network or other types of networks. Background Art

[0005] Wireless communication systems are widely deployed to provide various communication services such as telephony, video, data, messaging, and broadcast. These wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access systems include 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) 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 a few.

[0006] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at municipal, national, regional, and even global levels. New Radio (e.g., 5G NR) is an example of an emerging telecommunication standard. NR is a set of enhancements to the LTE mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband Internet access by improving spectral efficiency, reducing costs, improving services, leveraging new spectrum, and better integrating with other open standards using OFDMA with cyclic prefix (CP) on the downlink (DL) and uplink (UL). To this end, NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

[0007] However, as the demand for mobile broadband access continues to increase, further improvements to NR and LTE technologies are needed. Preferably, these improvements should be applicable to other multiple access technologies and the telecommunication standards that employ them. Summary of the invention

[0008] The systems, methods, and devices of the present disclosure each have several aspects, no single one of which is solely responsible for the desirable attributes of the present disclosure. Without limiting the scope of the present disclosure as expressed by the appended claims, some features will now be briefly discussed. After considering this discussion, and particularly after reading the section entitled "Detailed Description of the Invention," one will understand how the features of the present disclosure provide advantages including improved communication between wireless communication devices.

[0009] Certain aspects provide a method for wireless communication by a child node of a network (e.g., a UE or MU of an integrated access backhaul (IAB) network). The method generally includes determining a synchronization signal block (SSB) resource used by at least one parent node of the network for periodic SSB transmissions. The method generally includes performing SSB-based interference measurements using the determined resources. The method generally includes communicating with at least one of a parent node, a central unit (CU), or another node of the network based on the SSB-based interference measurements.

[0010] Certain aspects provide a method for wireless communication by a parent node of a network (e.g., a parent node / DU or CU of an IAB network). The method generally includes determining resources used by at least one child node of the network for periodic SSB transmissions. The method generally includes performing SSB-based interference measurements using the determined resources. The method generally includes communicating with at least one of a child node, a CU, or another node of the network based on the SSB-based interference measurements.

[0011] Certain aspects provide a method for wireless communication by a central unit of a network (eg, a CU of an IAB network). The method generally includes providing an indication of SSB resources used by at least one second node of the network for periodic SSB transmissions to a first node of the network.

[0012] Certain aspects provide an apparatus for wireless communication. The apparatus generally includes at least one processor, and a memory coupled to the at least one processor. The memory generally includes code executable by the at least one processor to cause the apparatus to determine SSB resources used by at least one parent node of the network for periodic SSB transmissions. The memory generally includes code executable by the at least one processor to cause the apparatus to perform SSB-based interference measurements using the determined resources. The memory generally includes code executable by the at least one processor to cause the apparatus to communicate with at least one of a parent node, a CU, or another node of the network based on the SSB-based interference measurements.

[0013] Certain aspects provide an apparatus for wireless communication. The apparatus generally includes at least one processor, and a memory coupled to the at least one processor. The memory generally includes code executable by the at least one processor to cause the apparatus to determine resources used by at least one child node of the network for periodic SSB transmissions. The memory generally includes code executable by the at least one processor to cause the apparatus to perform SSB-based interference measurements using the determined resources. The method generally includes communicating with at least one of a child node, a CU, or another node of the network based on the SSB-based interference measurements.

[0014] Certain aspects provide an apparatus for wireless communication. The apparatus generally includes at least one processor and a memory coupled to the at least one processor. The memory generally includes code executable by the at least one processor to cause the apparatus to provide, to a first node of a network, an indication of an SSB resource used by at least one second node of the network for periodic SSB transmissions.

[0015] Certain aspects provide an apparatus for wireless communication. The apparatus generally includes components for determining SSB resources used by at least one parent node of a network for periodic SSB transmissions. The apparatus generally includes components for performing SSB-based interference measurements using the determined resources. The apparatus generally includes components for communicating with at least one of a parent node, a CU, or another node of the network based on the SSB-based interference measurements.

[0016] Certain aspects provide an apparatus for wireless communication. The apparatus generally includes components for determining resources used by at least one child node of a network for periodic SSB transmissions. The apparatus generally includes components for performing SSB-based interference measurements using the determined resources. The apparatus generally includes components for communicating with at least one of a child node, a CU, or another node of the network based on the SSB-based interference measurements.

[0017] Certain aspects provide an apparatus for wireless communications. The apparatus generally includes means for providing, to a first node of a network, an indication of SSB resources used by at least one second node of the network for periodic SSB transmissions.

[0018] Certain aspects provide a computer-readable medium having computer-executable code stored thereon for wireless communication. The computer-readable medium generally includes code for determining SSB resources used by at least one parent node of a network for periodic SSB transmissions. The computer-readable medium generally includes code for performing SSB-based interference measurements using the determined resources. The computer-readable medium generally includes code for communicating with at least one of a parent node, a CU, or another node of the network based on the SSB-based interference measurements.

[0019] Certain aspects provide a computer-readable medium having computer executable code stored thereon for wireless communication. The computer-readable medium generally includes code for determining resources used by at least one child node of a network for periodic SSB transmissions. The computer-readable medium generally includes code for performing SSB-based interference measurements using the determined resources. The computer-readable medium generally includes code for communicating with at least one of a child node, a CU, or another node of the network based on the SSB-based interference measurements.

[0020] Certain aspects provide a computer-readable medium having stored thereon computer-executable code for wireless communication. The computer-readable medium generally includes code for providing, to a first node of a network, an indication of SSB resources used by at least one second node of the network for periodic SSB transmissions.

[0021] To achieve the aforementioned and related ends, one or more aspects include features fully described below and particularly pointed out in the claims. The following description and drawings set forth in detail certain illustrative features of one or more aspects. However, these features represent only a few of the many ways in which the principles of the various aspects may be employed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to understand the above features of the present disclosure in detail, a more specific description briefly summarized above may be obtained by reference to some aspects, some of which are shown in the accompanying drawings. However, it should be noted that the attached drawings only illustrate certain typical aspects of the present disclosure and therefore should not be considered as limiting its scope, as the description may admit other equally effective aspects.

[0023] Figure 1 is a block diagram conceptually illustrating an example wireless communication network in accordance with certain aspects of the present disclosure.

[0024] Figure 2 is a block diagram conceptually illustrating designs of example base stations (BSs) and user equipment (UEs) in accordance with certain aspects of the present disclosure.

[0025] Figure 3 is an example frame format for certain wireless communication systems (e.g., New Radio (NR)) in accordance with certain aspects of the present disclosure.

[0026] Figure 4 is a diagram illustrating an example of an integrated access backhaul (IAB) network architecture in accordance with certain aspects of the present disclosure.

[0027] Figure 5 is an example frame format for certain wireless communication systems (e.g., NR) in accordance with certain aspects of the present disclosure.

[0028] FIG. 6A to FIG. 6D An example interference scenario in accordance with certain aspects of the present disclosure is shown.

[0029] Figure 7 is a flow diagram illustrating example operations for wireless communications by sub-nodes of a network in accordance with certain aspects of the present disclosure.

[0030] Figure 8 is a flow diagram illustrating example operations for wireless communications by a parent node of a network in accordance with certain aspects of the present disclosure.

[0031] Fig. 9 is a flow diagram illustrating example operations of wireless communications by a central unit of a network in accordance with certain aspects of the present disclosure.

[0032] Fig.10 A communications device according to aspects of the present disclosure is shown that may include various components configured to perform operations for the techniques disclosed herein.

[0033] Fig.11 A communications device according to aspects of the present disclosure is shown that may include various components configured to perform operations for the techniques disclosed herein.

[0034] Fig.12 A communications device according to aspects of the present disclosure is shown that may include various components configured to perform operations for the techniques disclosed herein.

[0035] To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements disclosed in one aspect may be beneficially utilized on other aspects without specific recitation. DETAILED DESCRIPTION

[0036] Aspects of the present disclosure provide techniques for performing interference measurements based on synchronization signal blocks (SSBs) in a wireless network, such as an integrated access backhaul (IAB) network. In some cases, a first node determines an SSB resource used by at least one second node for periodic SSB transmissions, performs SSB-based interference measurements using the determined resources, and communicates with a parent node, a central unit (CU), or another node of the network based on the SSB-based interference measurements.

[0037] The following description provides an example of interference measurement based on SSB in an IAB network in a communication system, and does not limit the scope, applicability or examples set forth in the claims. Without departing from the scope of the present disclosure, the functions and arrangements of the elements discussed may be changed. Various examples may omit, replace or add various procedures or components as appropriate. For example, the described method may be performed in a different order from that described, and various steps may be added, omitted or combined. Moreover, the features described with respect to some examples may be combined in some other examples. For example, any number of aspects set forth herein may be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods that are practiced using other structures, functions or structures and functions other than or different from the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of the claims. The word "exemplary" means "as an example, instance or illustration" in this article. Any aspect described as "exemplary" herein is not necessarily to be interpreted as being preferred or superior to other aspects.

[0038] Generally, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific radio access technology (RAT) and can operate on one or more frequencies. RAT can also be referred to as radio technology, air interface, etc. Frequency can also be referred to as carrier, subcarrier, channel, tone, subband, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs.

[0039] The techniques described herein can be used for various wireless networks and radio technologies. Although terms commonly associated with 3G, 4G, and / or new radio (e.g., 5G NR) wireless technologies may be used herein to describe various aspects, various aspects of the present disclosure may also be applied to other communication systems based on generations.

[0040] NR access can support various wireless communication services, such as enhanced mobile broadband (eMBB) for wide bandwidth, millimeter wave mmW, massive machine type communication MTC (mMTC) for non-backward compatible MTC technology, and / or mission critical 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 their respective quality of service (QoS) requirements. In addition, these services can coexist in the same subframe.

[0041] NR supports beamforming and can dynamically configure the beam direction. MIMO transmission with precoding can also be supported. MIMO configuration in DL can support up to 8 transmit antennas with multi-layer DL transmission up to 8 streams and up to 2 streams per UE, can support multi-layer transmission with up to 2 streams per UE, and can support aggregation of multiple cells with up to 8 serving cells.

[0042] Figure 1 An example wireless communication network 100 is shown in which aspects of the present disclosure may be performed.

[0043] For example, the wireless communication network 100 may include a base station (BS) 110 and a UE 120, which are configured to perform interference measurement based on SSB in an IAB network. Figure 1 As shown, according to aspects of the present disclosure, BS 110a includes an SSB measurement manager 112 that communicates with nodes of the IAB network based on SSB-based interference measurements. According to aspects of the present disclosure, UE 120a includes an SSB measurement manager 122 that communicates with nodes of the IAB network based on SSB-based interference measurements.

[0044] The wireless communication network 100 may be a NR system (eg, a 5G NR network). Figure 1 As shown, the wireless communication network 100 may communicate with a core network 132. The core network 132 may communicate with one or more BSs 110a-z (each also individually referred to herein as BS 110 or collectively referred to herein as BS 110) and / or UEs 120a-y (each also individually referred to herein as UE 120 or collectively referred to herein as UE 120) in the wireless communication network 100 via one or more interfaces.

[0045] BS 110 may provide communication coverage for a particular geographic area, sometimes referred to as a "cell," which may be stationary or may move depending on the location of mobile BS 110. In some examples, BS 110 may be interconnected to another and / or one or more other BSs or network nodes (not shown) in wireless communication network 100 via various types of backhaul interfaces (e.g., direct physical connections, wireless connections, virtual networks, etc.) using any suitable transport network. Figure 1 In the example shown, BSs 110a, 110b, and 110c may be macro BSs for macro cells 102a, 102b, and 102c, respectively. BS 110x may be a pico BS for pico cell 102x. BSs 110y and 110z may be femto BSs for femto cells 102y and 102z, respectively. A BS may support one or more cells.

[0046] The BS 110 communicates with the UE 120 in the wireless communication network 100. The UEs 120 (e.g., 120x, 120y, etc.) may be dispersed throughout the wireless communication network 100, and each UE 120 may be stationary or mobile. The wireless communication network 100 may also include a relay station (e.g., relay station 110r), also referred to as a relay, etc., which receives transmissions of data and / or other information from an upstream station (e.g., BS 110a or UE 120r) and transmits transmissions of data and / or other information to a downstream station (e.g., UE 120 or BS 110), or which relays transmissions between UEs 120 to facilitate communication between devices.

[0047] The network controller 130 may communicate with a set of BSs 110 and provide coordination and control (e.g., via a backhaul) for these BSs 110. In some aspects, the network controller 130 may communicate with a core network 132 (e.g., a 5G core network (5GC)), which provides various network functions such as access and mobility management, session management, user plane functions, policy control functions, authentication server functions, unified data management, application functions, network exposure functions, network repository functions, network slice selection functions, etc.

[0048] Figure 2 Example components of BS 110a and UE 120a are shown (eg, Figure 1 A wireless communication network 100) which may be used to implement aspects of the present disclosure.

[0049] At BS110a, the transmit processor 220 may receive data from the data source 212 and control information from the controller / processor 240. The control information may be used for a physical broadcast channel (PBCH), a physical control format indicator channel (PCFICH), a physical hybrid ARQ indicator channel (PHICH), a physical downlink control channel (PDCCH), a group common PDCCH (GC PDCCH), etc. The data may be used for a physical downlink shared channel (PDSCH), etc. A media access control (MAC) control element (MAC-CE) is a MAC layer communication structure that may be used for control command exchange between wireless nodes. The MAC-CE may be carried in a shared channel such as a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), or a physical sidelink shared channel (PSSCH).

[0050] The processor 220 may process (e.g., encode and symbol map) data and control information to obtain data symbols and control symbols, respectively. The transmit processor 220 may also generate reference symbols such as for a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a PBCH demodulation reference signal (DMRS), and a channel state information reference signal (CSI-RS). If applicable, the transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, and / or reference symbols, and may provide an output symbol stream to a modulator (MOD) in a transceiver 232a-232t. Each modulator in a transceiver 232a-232t may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator may further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The downlink signals from the modulators in the transceivers 232a-232t may be transmitted via antennas 234a-234t, respectively.

[0051] At UE 120a, antennas 252a-252r may receive downlink signals from BS 110a and may provide received signals to demodulators (DEMODs) in transceivers 254a-254r, respectively. Each demodulator in transceivers 254a-254r may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. MIMO detector 256 may obtain received symbols from all demodulators in transceivers 254a-254r, perform MIMO detection on the received symbols (if applicable), and provide detected symbols. Receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for UE 120a to data sink 260, and provide decoded control information to controller / processor 280.

[0052] On the uplink, at the UE 120a or child IAB node, the transmit processor 264 may receive and process data from the data source 262 (e.g., for a physical uplink shared channel (PUSCH) or PSSCH) and control information from the controller / processor 280 (e.g., for a physical uplink control channel (PUCCH) or PSCCH). The transmit processor 264 may also generate reference symbols for reference signals (e.g., for a sounding reference signal (SRS)). The symbols from the transmit processor 264 may be precoded by the TX MIMO processor 266 (if applicable), further processed by the modulators in the transceivers 254a-254r (e.g., for SC-FDM, etc.), and transmitted to the base station 110 or parent IAB node.

[0053] At BS 110a or parent IAB node, the uplink signal from UE 120a may be received by antenna 234, processed by demodulators in transceivers 232a-232t, detected by MIMO detector 236 (if applicable), and further processed by receive processor 238 to obtain decoded data and control information transmitted by UE 120a. Receive processor 238 may provide decoded data to data receiver 239 and decoded control information to controller / processor 240.

[0054] Memories 242 and 282 may store data and program codes for BS 110a and UE 120a, respectively.A scheduler 244 may schedule UEs for data transmission on the downlink and / or uplink.

[0055] The antennas 252, processors 266, 258, 264, and / or controller / processor 280 of the UE 120a and / or the antennas 234, processors 220, 230, 238, and / or controller / processor 240 of the BS 110a may be used to perform the various techniques and methods described herein. Figure 2 As shown, according to aspects described herein, the controller / processor 240 of the BS 110a has an SSB interference manager 241 that communicates with nodes of the IAB network based on SSB-based interference measurements. Figure 2 As shown, according to aspects described herein, the controller / processor 280 of the UE 120a has an SSB interference manager 281, which communicates with nodes of the IAB network based on SSB-based interference measurements. Although shown as a controller / processor, other components of the UE 120a and the BS 110a can also be used to perform the operations described herein.

[0056] NR can utilize Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) on both uplink and downlink. NR can support half-duplex operation using Time Division Duplex (TDD). OFDM and Single Carrier Frequency Division Multiplexing (SC-FDM) divide the system bandwidth into multiple orthogonal subcarriers, which are also commonly referred to as tones, bins, etc. Each subcarrier can be modulated with data.

[0057] Figure 3 is a schematic diagram illustrating an example of a radio access network according to various aspects of the present disclosure.

[0058] As shown by reference numeral 305, a conventional (e.g., 3G, 4G, LTE) radio access network may include a plurality of base stations (BSs) 310 (e.g., access nodes (ANs)), wherein each BS 310 communicates with a core network via a wired backhaul link 315 (such as a fiber optic connection). The BS 310 may communicate with a UE 320 via an access link 325, which may be a wireless link. In some aspects, Figure 3 The BS 310 shown in FIG. 3 may correspond to Figure 1 BS110a shown in FIG. Figure 3 The UE 320 shown in FIG. 3 may correspond to Figure 1 UE 120a shown in .

[0059] As shown by reference numeral 330, the radio access network may include a wireless backhaul network. In some aspects or scenarios, the wireless backhaul network may sometimes be referred to as an integrated access backhaul (IAB) network. The IAB network may include multiple BSs, and sometimes the BSs may be of different types or have different operating characteristics. For example, in some aspects, the IAB network may have at least one BS as an anchor BS 335. The anchor BS may communicate with the core network via a wired backhaul link 340 (such as an optical fiber connection). The anchor BS 335 may also be referred to as an IAB donor. The anchor BS 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).

[0060] The IAB network may also include one or more non-anchor BSs 345. The non-anchor BS may be referred to as a relay BS or an IAB node. The non-anchor BS 345 may communicate with the anchor BS 335 directly or indirectly (e.g., via one or more other non-anchor base stations 345) via one or more backhaul links 350 to form a backhaul path to the core network for carrying backhaul traffic. The backhaul link 350 may be a wireless link. The anchor BS 335 or the non-anchor BS 345 may communicate with one or more UEs 355 via an access link 360, which may be a wireless link for carrying access traffic. In some aspects, Figure 3 The anchor BS 335 or the non-anchor BS 345 shown in FIG. 3 may correspond to Figure 1 BS110 shown in FIG. Figure 3 The UE 355 shown in FIG. 3 may correspond to Figure 1 UE 120 shown in .

[0061] As shown in reference numeral 365, in some aspects, a radio access network including an IAB network can utilize multiple spectrum types. For example, an IAB network can utilize multiple different radio frequency bands. In some specific examples and according to some aspects, millimeter wave technology or directional communication (e.g., beamforming, precoding) can be utilized to communicate 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, a wireless backhaul link 370 between BSs can use millimeter waves to carry information, or can use beamforming, precoding to direct a target BS. Similarly, a wireless access link 375 between a UE and a BS can use millimeter waves or can be directed to a target wireless node (e.g., a UE or a base station). In this way, inter-link interference can be reduced.

[0062] In some aspects, the IAB network may support a multi-hop network or a multi-hop wireless backhaul. Additionally or alternatively, each node of the IAB network may use the same radio access technology (e.g., 5GNR). Additionally or alternatively, the nodes of the IAB network may share resources such as time resources, frequency resources, and space resources for access links and backhaul links. In addition, various architectures of IAB nodes or IAB donors may be supported.

[0063] In some aspects, the IAB donor may include a central unit (CU) that configures IAB nodes accessing the core network via the IAB donor, and may include a distributed unit (DU) that schedules and communicates with child nodes of the IAB donor.

[0064] In some aspects, the IAB node may include a mobile terminal component (MT) scheduled by and communicating with the DU of the parent node, 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 described in conjunction with the BS 110 for the IAB node, and the MT of the IAB node may perform the functions described in conjunction with the UE 120 for the IAB node.

[0065] Figure 4 is a schematic diagram showing an example of an IAB network architecture according to various aspects of the present disclosure. Figure 4 As shown, the IAB network may include an IAB donor 405, which is connected to the core network via a wired connection (e.g., such as a wired optical fiber). For example, the Ng interface of the IAB donor 405 may terminate at the core network. Additionally or alternatively, the IAB donor 405 may be connected to one or more devices of the core network that provide a core access and mobility management function (AMF). In some aspects, as described above in conjunction with Figure 3 As described, the IAB donor 405 may include a BS 110 (such as an anchor BS). As shown, the IAB donor 405 may include a CU, which may perform an ANC function or an AMF function. The CU may configure a DU of the IAB donor 405 or may configure one or more IAB nodes 410 (e.g., an MT or DU of the IAB node 410) connected to the core network via the IAB donor 405. Therefore, the CU of the IAB donor 405 may control or configure the entire IAB network connected to the core network via the IAB donor 405, such as by using a control message or a configuration message (e.g., a radio resource control (RRC) configuration message, an F1 application protocol (F1AP) message).

[0066] As described above, the IAB network may include an IAB node 410, which (shown as IAB nodes 1 to 4) is connected to the core network via an IAB donor 405. As shown, the IAB node 410 may include an MT and may include a DU. The MT of an IAB node 410 (e.g., a child node) may be controlled or scheduled by another IAB node 410 (e.g., a parent node) or an IAB donor 405. An IAB node 410 (e.g., a parent node) may control or schedule other IAB nodes 410 (e.g., a child node of a parent node) or a UE 120. Therefore, a DU may be referred to as a scheduling node or a scheduling component, and an MT may be referred to as a scheduled node or a scheduled component. In some aspects, an IAB donor 405 may include a DU without an MT. That is, the IAB donor 405 may configure, control or schedule the communication of an IAB node 410 or a UE 120. The UE 120 may include only an MT without a DU. That is, the communication of UE 120 may be controlled or scheduled by IAB donor 405 or IAB node 410 (eg, a parent node of UE 120).

[0067] According to some aspects, certain nodes may be configured to participate in the control / scheduling process. For example, in some aspects, when a first node controls or schedules communication for a second node (e.g., when the first node provides DU functionality for the MT of the second node), the first node may be referred to as the parent node of the second node, and the second node may be referred to as the child node of the first node. The child node of the second node may be referred to as the grandchild node of the first node. Therefore, the DU of the parent node may control or schedule communication for the child node of the parent node. The parent node may be an IAB donor 405 or an IAB node 410, and the child node may be an IAB node 410 or a UE 120. The communication of the MT of the child node may be controlled or scheduled by the parent node of the child node.

[0068] like Figure 4 As further shown, the link between UE 120 and IAB donor 405 (or between UE 120 and IAB node 410) may be referred to as an access link 415. Each access link 415 may be a wireless access link that provides UE 120 with radio access to a core network via IAB donor 405 and potentially via one or more IAB nodes 410.

[0069] like Figure 4As further shown, the link between the IAB donor 405 and the IAB node 410 (or between two IAB nodes 410) can be referred to as a backhaul link 420. Each backhaul link 420 can be a wireless backhaul link that provides the IAB node 410 with radio access to the core network via the IAB donor 405 and potentially via one or more other intermediate IAB nodes 410. In some aspects, the backhaul link 420 can be a primary backhaul link or an auxiliary backhaul link (e.g., a backup backhaul link). In some aspects, if the primary backhaul link fails, becomes congested, or becomes overloaded, the auxiliary backhaul link can be used. In the IAB network, network resources (e.g., time resources, frequency resources, space resources) for wireless communication can be shared between the access link 415 and the backhaul link 420.

[0070] As described above, in a typical IAB network, the IAB nodes (e.g., non-anchor base stations) are stationary (i.e., do not move). The next generation (5G) wireless networks have stated goals of providing ultra-high data rates and supporting a wide range of application scenarios. The IAB system has been studied in 3GPP as a possible solution to help support these goals.

[0071] As mentioned above, in IAB, a wireless backhaul solution is adopted to connect the cells (IAB nodes) to the core network (which uses wired backhaul). Some attractive features of IAB are support for multi-hop wireless backhaul, where both access and backhaul links share the same technology (e.g., 5G NR) and resources (e.g., frequency band).

[0072] There are multiple possible architectures for the IAB-node, including Layer 2 (L2) and Layer 3 (L3) solutions, and the specific architecture deployed may depend on which layers of the protocol stack are implemented in the intermediate node (IAB-node), for example, an L2 relay may implement the physical (PHY) layer, the medium access control (MAC) layer, and / or the radio link control (RLC) layer.

[0073] Figure 5is a schematic diagram showing an example of a frame format 500 of NR. The transmission timeline of each of the downlink and uplink can be divided into radio frame units. Each radio frame can have a predetermined duration (e.g., 10ms) and can be divided into 10 subframes, each subframe is 1ms, and the index is 0 to 9. Each subframe can include a variable number of slots (e.g., 1, 2, 4, 8, 16... slots) depending on the SCS. Each slot can include a variable number of symbol periods (e.g., 7, 12 or 14 symbols) depending on the SCS. The symbol period in each slot can be assigned an index. The subslot structure can refer to a transmission time interval with a duration less than a slot (e.g., 2, 3 or 4 symbols). Each symbol in a slot can be configured as a link direction (e.g., DL, UL or flexible) for data transmission, and the link direction of each subframe can be dynamically switched. The link direction can be based on the slot format. Each slot can include DL / UL data and DL / UL control information.

[0074] In NR, synchronization signal blocks (SSBs) are transmitted. In certain aspects, SSBs may be transmitted in bursts, where each SSB in the burst corresponds to a different beam direction for beam management (e.g., including beam selection and / or beam refinement) at the UE side. SSBs include PSS, SSS, and two symbols PBCH. SSBs may be sent at fixed timeslot positions (such as at Figure 5 0-3) shown in . The UE can use PSS and SSS for cell search and acquisition. PSS can provide half-frame timing, and SS can provide CP length and frame timing. PSS and SSS can provide cell identification. PBCH carries some basic system information, such as downlink system bandwidth, timing information within a radio frame, SS burst set periodicity, system frame number, etc. SSBs can be organized into SS bursts to support beam scanning. Further system information (such as remaining minimum system information (RMSI), system information block (SIB), other system information (OSI)) can be sent on the physical downlink shared channel (PDSCH) in certain subframes. SSBs can be sent up to 64 times, for example, there can be up to 64 different beam directions for millimeter waves. Multiple transmissions of SSBs are called SS burst sets. SSBs in an SS burst set can be sent in the same frequency region, and SSBs in different SS burst sets can be sent in different frequency regions.

[0075] Exemplary Sync Signal Block-Based Interference Measurement in IAB

[0076] Aspects of the present disclosure provide techniques for interference measurement based on synchronization signal blocks (SSBs) in wireless networks, such as integrated access backhaul (IAB) networks.

[0077] Generally, the IAB network adopts and uses interference mitigation techniques defined for other radio access networks. However, if two neighboring cells that interfere with each other via inter-carrier interference (ICI) or cross-link interference (CLI) are an IAB node and its parent node, this relationship between the cells allows for more efficient local interference handling in terms of interference measurement, reporting and / or coordination for the interference.

[0078] FIG. 6A to FIG. 6D Different example scenarios of interference between an IAB node (denoted as C) and its parent node (denoted as P) are shown. In the figure, the larger circle in the parent node P and the child node C represents a distributed unit (DU), while the smaller circle represents a mobile terminal module (MT).

[0079] In some scenarios, interference may exist when one node is transmitting and another node is receiving. Fig. 6A , while child node C is receiving from child node n2, child node C may experience interference (represented by the dotted line) when parent node P is transmitting to another child node n1. Similarly, when parent node P is receiving from child node n1, parent node P may experience interference when child node C is transmitting to child node n2. Fig. 6A The interference in may be CLI and may occur during dynamic time division duplex (TDD).

[0080] Interference may also occur during static TDD. Figure 6B In the example, a transmission from a parent node P to a grandparent node GP causes interference while a child node C is receiving from another node n2. Similarly, a transmission from a child node C to a node n2 causes interference while a parent node P is receiving from a grandparent node GP.

[0081] In some cases, interference may exist when one node is transmitting to two different nodes. Figure 6C In FIG. 4 , transmissions from the parent node P to the MT of the child node C may interfere with the reception of transmissions from the child node n2 by the child node C on the DU of the child node C. Similarly, transmissions from the DU of the child node C may interfere with reception on the MT of the parent node P. These interference scenarios may occur during spatial division multiplexing (SDM) across adjacent hops.

[0082] Some scenarios involve interference when transmitting to or receiving from multiple parent nodes. For example, Fig.6DIn the example, child node C may receive and / or transmit to parent node P1 or P2. When receiving, transmissions from one parent node may interfere with child node C receiving transmissions from another parent node. When transmitting, transmissions from child node C to one of the parent nodes may interfere with transmissions to the other parent node. These interference scenarios may occur for co-channel dual connectivity (DC) using SDM.

[0083] In some scenarios, the IAB node may measure interference based on the uplink. For example, the network may configure a sounding reference signal (SRS) resource set so that the IAB node can perform uplink interference measurements. The configuration may include information about the transmit beam, such as spatial relationship information (e.g., SpatialRelationInfo, quasi-co-location (QCL) with SSB, channel state information reference signal (CSI-RS), and / or SRS). In some cases, such information may not be configured and it may be assumed that the UE performs uplink beam scanning. Using UL-based measurements, there may be no reports.

[0084] Generally, a parent node (P) may have multiple beam candidates (N_P), and some of the parent beam candidates may be associated with the parent node's MT (on the backhaul (BH) link to the grandparent node). Similarly, a child node (C) may have multiple beam candidates (N_C) associated with the child node's DU and MT (also in the case of multiple parent nodes).

[0085] To resolve interference, the parent node and the child node can learn the interference matrix of any node pair of the IAB network. The interference matrix can indicate the reference signal received power (RSRP) or the received signal strength indicator (RSSI). The size of the matrix can be N_P x N_C, where each entry can be associated with a corresponding beam pair.

[0086] Aspects of the present disclosure provide techniques for interference measurement based on periodic SSB.Although the techniques presented herein are described with reference to an IAB network and corresponding nodes, the techniques may be more generally applied to any type of wireless node (eg, generally to UEs and base stations).

[0087] Figure 7 700 is a flow diagram illustrating example operations 700 for wireless communication by a child node (e.g., of an IAB network) in accordance with certain aspects of the present disclosure. Operations 700 may be implemented as a process on one or more processors (e.g., Figure 2 In addition, in operation 700, the communication may be performed, for example, via one or more antennas (e.g., Figure 2The antenna 234 of the first wireless communication device enables the transmission and reception of signals by the first wireless communication device. In some aspects, the transmission and / or reception of signals by the first wireless communication device can be implemented via a bus interface of one or more processors (e.g., controllers / processors 230, 220, 238, 240, and 244) that obtain and / or output signals.

[0088] Operations 700 may begin, at 702, by determining SSB resources used by at least one parent node of a network for periodic SSB transmissions.

[0089] In some aspects, at 704, the child node determines a measurement gap for performing SSB-based interference measurement.

[0090] At 706, the child node performs SSB-based interference measurement using the determined resources.

[0091] At 708, the child node communicates with at least one of a parent node, a central unit (CU), or another node of the network based on the SSB-based interference measurement.

[0092] Figure 8 8 is a flow diagram illustrating example operations 800 for wireless communication by a parent node (e.g., of an IAB network) in accordance with certain aspects of the present disclosure. Operations 800 may be implemented as a process on one or more processors (e.g., Figure 2 In addition, in operation 800, the communication may be performed, for example, via one or more antennas (e.g., Figure 2 The antenna 252 of the first wireless communication device enables the transmission and reception of signals by the first wireless communication device. In some aspects, the transmission and / or reception of signals by the first wireless communication device can be implemented via a bus interface of one or more processors (e.g., controllers / processors 258, 264, 266, and / or 280) that obtain and / or output signals.

[0093] Operations 800 begin, at 802, by determining SSB resources used by at least one child node of a network for periodic SSB transmissions.

[0094] At 804, the parent node performs SSB-based interference measurement using the determined resources.

[0095] In some aspects, at 806, the parent node provides a report with information of the SSB-based interference measurement to at least one of the child node or the CU of the network.

[0096] At 808, the parent node communicates with at least one of the child node, the CU, or another node of the network based on the SSB-based interference measurement.

[0097] Fig. 9 900 is a flow chart illustrating example operations 900 for wireless communication by a central unit (e.g., of an IAB network) in accordance with certain aspects of the present disclosure. Operations 900 may be implemented as a process on one or more processors (e.g., Figure 2 In addition, in operation 900, the communication may be performed, for example, via one or more antennas (e.g., Figure 2 The antenna 252 of the first wireless communication device enables the transmission and reception of signals by the first wireless communication device. In some aspects, the transmission and / or reception of signals by the first wireless communication device may be implemented by a bus interface of one or more processors (e.g., controllers / processors 258, 264, 266, and / or 280) that obtain and / or output signals.

[0098] Operations 900 begin by providing, to a first node of a network, an indication of SSB resources used by at least one second node of the network for periodic SSB transmissions, at 902. The first node may be a child node or a parent node, and the second node may be a parent node or a child node, respectively.

[0099] In some aspects, at 904, a measurement configuration is provided by the central unit to the first node for performing SSB-based interference measurement using SSB transmissions by the second node.

[0100] In some aspects, the DU of the parent node (P) may transmit periodic SSBs. Some periodic SSBs may be cell-defined SSBs (CD-SSBs). CD-SSBs may be used to provide initial access to MTs. Some periodic SSBs may be SSBs for mobility and radio resource management (RRM-SSBs). MTs may use RRM-SSBs to perform measurements and / or reports required for handover. In some cases, RRM-SSBs may also be used for inter-relay discovery.

[0101] According to aspects of the present disclosure, the child node (C) can use these periodic SSBs to perform interference measurements (IM) (e.g., measuring various combinations of transmit beams (i.e., SSBs) and receive beams). Therefore, the child node can learn the N_P x N_C interference matrix using the received signal strength indicator (RSSI) information.

[0102] In some cases, there may be other cells, sectors, and / or distributed units (DUs) collocated with the serving cell at the parent node. The child node may know the identity and / or configuration of these other nodes and may be provided with the physical cell IDs (PCIs) of the other cells or sectors at the parent node. Additionally, the child node may be provided with resources and configurations used by these other nodes to transmit their periodic SSBs. For example, for CD-SSB, the child node may be provided with information about the time position of the burst set (associated half-frame), the synchronization signal (SS) grid, the periodicity, the transmitter of the SSB, and / or the transmit power. For RRM-SSB, the child node may be provided with an SSB measurement timing configuration (SMTC), including information about the transmit power.

[0103] A child node may require measurement gaps to perform SSB-based interference measurements (even only for the DU of its own parent node). A measurement gap may be a time window during which the MT of the child node is not scheduled by the DU of the parent node. In some cases, the child node may request a measurement gap from the CU to allocate resources and semi-statically configure communications accordingly. In some cases, the child node may request a measurement gap from the DU of the parent node, which may be a L1 uplink control information (UCI) request or a L2 medium access control (MAC) control element (MAC-CE) request. In some aspects, the network (CU) or the DU of the parent node may reserve and indicate measurement gaps for the child node, either proactively or in response to a request from the child node.

[0104] In some aspects, the child node uses the determined periodic SSB resources to perform interference measurements. For example, the child node uses one or more receive beams to measure the SSBs transmitted by the cell, where the receive beams are associated with the beam directions of other communications of the child DU. The DU of the CU or parent node can indicate to the child node which receive beam direction to use for measurement. In some cases, the child node can provide a report on its measurements to the CU or parent node.

[0105] In some aspects, the (multiple) DUs of the child node may also transmit periodic SSBs over the air. The periodic SSBs may be CD-SSBs or RRM-SSBs. The parent node may use these periodic SSBs for interference measurements (e.g., measuring various combinations of transmit beams (i.e., SSBs) and receive beams). Thus, the parent node may then utilize the received signal strength power (RSSP) information to learn the [N_P xN_C] interference matrix.

[0106] For a parent node to use periodic SSBs to make interference measurements, the parent node needs to know the resources on which the child node transmits its SSBs, and the parent node needs "free" resources (eg, measurement gaps) to make measurements without affecting ongoing communications.

[0107] For CD-SSB, the parent node may have detected the DU of the child node by running a cell search process. The cell search process may be implementation specific. In some cases, the parent node is provided with the PCI of the child node DU. In some cases, the parent node is provided with the resources and configuration (including transmit power) of the DU of the child node for CD-SSB transmission. If the measurement window is located within the DU resources of the parent node, the parent node can have greater flexibility (still possible overlap with semi-static communications) because no communication is scheduled. If the window is located in the resources where the MT of the parent node is activated, the parent node can perform measurements when it is not scheduled by the grandparent node. In some cases, the parent node may request a gap window from the CU for allocating resources and thus semi-statically configured communications. In some cases, the parent node may request a gap window from its parent node, and the request may be an L1 (uplink control information (UCI)) or L2 (MAC-CE) request. The parent node of the CU or parent node may reserve and indicate measurement gaps for the parent node actively or in response to a request from a child node.

[0108] For RRM-SSB (e.g., SSB configured for inter-relay discovery), the MT of the parent node is provided with the SMTC configuration. The parent node may be provided with the PCI of the DU of the child node. The CU may align the SMTC of the MT of the parent node and the SSB transmission configuration (STC) of the DU cell of the child node at the measurement opportunity. In some cases, the measurement gap may not be guaranteed, so the parent node may request a gap window from the CU or its parent node.

[0109] In some aspects, the parent node uses the determined SSB resources to make interference measurements with its child node. For example, the parent node uses one or more receive beams to measure SSBs, where the receive beams are associated with beam directions of other communications of the parent node's DU. The CU may indicate which receive beam directions are used for measurements. In some cases, the parent node's DU may provide a report on its measurements to the CU or child node.

[0110] Fig.10 The present invention shows that it may include a method configured to perform the operations of the technology disclosed herein (such as in Figure 7 1000 includes various components (e.g., components corresponding to means plus functionality) of the communication device 1000. The communication device 1000 includes a processing system 1002 coupled to a transceiver 1008 (e.g., a transmitter and / or a receiver). The transceiver 1008 is configured to send and receive signals, such as the various signals described herein, for the communication device 1000 via an antenna 1010. The processing system 1002 may be configured to perform processing functions of the communication device 1000, including processing signals received and / or to be transmitted by the communication device 1000.

[0111] The processing system 1002 includes a processor 1004 coupled to a computer-readable medium / memory 1012 via a bus 1006. In some aspects, the computer-readable medium / memory 1012 is configured to store instructions (e.g., computer-executable code) that, when executed by the processor 1004, cause the processor 1004 to perform Figure 7 , or other operations for performing various techniques discussed herein for SSB-based interference measurements in wireless networks, such as IAB networks. In some aspects, the computer-readable medium / memory 1012 stores code 1014 for determining SSB resources used by at least one parent node of the network for periodic SSB transmissions; code 1016 for performing SSB-based interference measurements using the determined resources; and code 1018 for communicating with at least one of the parent node, the CU, or another node of the network based on the SSB-based interference measurements. In some aspects, the computer-readable medium / memory 1012 may store code 1020 for determining a measurement gap for performing SSB-based interference measurements. In some aspects, the processor 1004 has circuitry configured to implement the code stored in the computer-readable medium / memory 1012. Processor 1004 includes circuitry 1024 for determining SSB resources used by at least one parent node of the network for periodic SSB transmissions; circuitry 1026 for performing SSB-based interference measurements using the determined resources; and circuitry 1028 for communicating with at least one of the parent node, a central unit (CU), or another node of the network based on the SSB-based interference measurements. In certain aspects, processor 1004 may include circuitry 1030 for determining a measurement gap for performing the SSB-based interference measurements.

[0112] For example, a component for transmitting (or a component for outputting for transmitting) may include Figure 2 The transmitter and / or antenna 234 of BS 110a or UE 120a or transmitter unit 254 and / or antenna 252 and / or Fig.10 The circuit 1028 of the communication device 1000 in FIG. 1000 may include a circuit 1028 of the communication device 1000 in FIG. 1000 . The means for receiving (or the means for obtaining) may include Figure 2 The receiver and / or antenna 234 of the BS 110a or the receiver and / or antenna 252 of the UE 120a and / or Fig.10 The circuit 1028 of the communication device 1000 in FIG. 1000. The means for communicating may include a transmitter, a receiver, or both. The means for generating, the means for executing, the means for determining, the means for taking action, the means for determining, the means for coordinating may include a processing system, which may include one or more processors, such as Figure 2 The transmit processor 220, TX MIMO processor 230, receive processor 238, and / or controller / processor 240 of the BS 110a shown in FIG. 1 , or the receive processor 258, transmit processor 264, TX MIMO processor 266, and / or controller / processor 280 of the UE 120a, and / or Fig.10 The processing system 1002 of the communication device 1000 in FIG.

[0113] Fig.11 The invention shows that it may include a system configured to perform operations for the techniques disclosed herein (such as Figure 8 1100 includes various components (e.g., corresponding to means plus functional components) of the communication device 1100 and the operations shown in FIG. 1102 . The communication device 1100 includes a processing system 1102 coupled to a transceiver 1108 (e.g., a transmitter and / or a receiver). The transceiver 1108 is configured to transmit and receive signals, such as the various signals described herein, for the communication device 1100 via an antenna 1110. The processing system 1102 may be configured to perform processing functions of the communication device 1100, including processing signals received and / or transmitted by the communication device 1100.

[0114] The processing system 1102 includes a processor 1104 coupled to a computer-readable medium / memory 1112 via a bus 1106. In some aspects, the computer-readable medium / memory 1112 is configured to store instructions (e.g., computer-executable code) that, when executed by the processor 1104, cause the processor 1104 to perform Figure 8, or other operations for performing the various techniques discussed herein for interference measurements based on SSBs in wireless networks, such as IAB networks. In some aspects, the computer-readable medium / memory 1112 stores code 1114 for determining SSB resources for use by at least one child node of the network for periodic SSB transmissions; code 1116 for performing SSB-based interference measurements using the determined resources; and code 1118 for communicating with at least one of the child nodes, the CU, or another node of the network based on the SSB-based interference measurements. In some aspects, the computer-readable medium / memory 1112 may store code 1120 for receiving signaling indicating different receive beams from the CU. In some aspects, the processor 1104 has circuitry configured to implement the code stored in the computer-readable medium / memory 1112. Processor 1104 includes circuitry 1124 for determining SSB resources for use by at least one child node of the network for periodic SSB transmissions; circuitry 1126 for performing SSB-based interference measurements using the determined resources; and circuitry 1128 for communicating with at least one of the child node, the CU, or another node of the network based on the SSB-based interference measurements. In certain aspects, processor 1104 may include circuitry 1130 for providing a report having information about the SSB-based interference measurements to at least one of the child node or the CU of the network.

[0115] For example, a component for transmitting (or a component for outputting for transmitting) may include Figure 2 The transmitter and / or antenna 234 of the BS 110a or the transmitter unit 254 and / or antenna 252 of the UE 120a shown in FIG. Fig.11 The circuit 1128 of the communication device 1100 in FIG. The means for receiving (or the means for obtaining) may include Figure 2 The receiver and / or antenna 234 of the BS 110a or the receiver and / or antenna 252 of the UE 120a shown in FIG. Fig.11 1128 of the communication device 1100 shown in FIG. 1128. The means for communicating may include a transmitter, a receiver, or both. The means for generating, the means for executing, the means for determining, the means for taking action, the means for determining, the means for coordinating may include a processing system, which may include one or more processors, such as Figure 2 The transmit processor 220, TX MIMO processor 230, receive processor 238 and / or controller / processor 240 of the BS 110a, or the receive processor 258, transmit processor 264, TX MIMO processor 266 and / or controller / processor 280 of the UE 120a, and / or Fig.11 The processing system 1102 of the communication device 1100 in FIG.

[0116] Fig.12 The diagram shows a method that may include operations configured to perform the techniques disclosed herein (such as Fig. 9 1200. The communication device 1200 includes a processing system 1202 coupled to a transceiver 1208 (e.g., a transmitter and / or a receiver). The transceiver 1208 is configured to transmit and receive signals, such as the various signals described herein, for the communication device 1200 via an antenna 1210. The processing system 1202 may be configured to perform processing functions for the communication device 1200, including processing signals received and / or transmitted by the communication device 1200.

[0117] The processing system 1202 includes a processor 1204 coupled to a computer-readable medium / memory 1212 via a bus 1206. In some aspects, the computer-readable medium / memory 1212 is configured to store instructions (e.g., computer-executable code) that, when executed by the processor 1204, cause the processor 1204 to perform Fig. 9 , or other operations for performing various techniques for performing interference measurements based on SSB in a wireless network (such as an IAB network) discussed herein. In some aspects, the computer-readable medium / memory 1212 stores code 1214 for providing an indication of SSB resources used by at least one cell associated with a second node of the network for periodic SSB transmissions to a first node of the network. In some aspects, the computer-readable medium / memory 1212 may store code 1120 for providing a report with information about SSB-based interference measurements to at least one of a subnode or CU of the network. In some aspects, the processor 1204 has circuits configured to implement the code stored in the computer-readable medium / memory 1212. The processor 1204 includes circuits 1214 for providing an indication of SSB resources used by at least one cell associated with a second node of the network for periodic SSB transmissions to a first node of the network. In some aspects, the processor 1204 may include circuits 1230 for providing a measurement configuration to the first node for performing SSB-based interference measurements using SSB transmissions by the second node.

[0118] For example, a component for transmitting (or a component for outputting for transmitting) may include Figure 2 The transmitter and / or antenna 234 of BS 110a or the transmitter unit 254 and / or antenna 252 of UE 120a shown in FIG. The means for receiving (or the means for obtaining) may include Figure 210a or the receiver and / or antenna 234 of BS 110a or the receiver and / or antenna 252 of UE 120a shown in FIG. 10A. The means for communicating may include a transmitter, a receiver, or both. The means for generating, the means for executing, the means for determining, the means for taking action, the means for determining, the means for coordinating may include a processing system, which may include one or more processors, such as Figure 2 The transmit processor 220, TX MIMO processor 230, receive processor 238, and / or controller / processor 240 of the BS 110a or the receive processor 258, transmit processor 264, TX MIMO processor 266, and / or controller / processor 280 of the UE 120a shown in FIG. Fig.12 The processing system 1202 of the communication device 1200 in FIG.

[0119] Example aspects

[0120] In a first aspect, a method for wireless communication by a child node of a network comprises: determining a synchronization signal block (SSB) resource used by at least one parent node of the network for periodic SSB transmission; performing SSB-based interference measurement using the determined resources; and communicating with at least one of the parent node, a central unit (CU), or another node of the network based on the SSB-based interference measurement.

[0121] In a second aspect, in combination with the first aspect, the child node, the parent node and the CU are part of an integrated access backhaul (IAB) network.

[0122] In the third aspect, in combination with any one of the first and second aspects, the method also includes at least one of the following: providing a report with information about SSB-based interference measurement to at least one of the parent node or CU; and receiving signaling indicating different receive beams from at least one of the parent node or CU.

[0123] In a fourth aspect, in combination with any one of the first to third aspects, the method also includes: determining resources for one or more other nodes collocated with the parent node; and using the determined SSB resources for the other nodes when performing SSB-based interference measurements.

[0124] In a fifth aspect, in combination with the fourth aspect, the method further includes: receiving physical cell identifiers (PCIs) of other cells or sectors at the parent node; and determining resources for one or more other nodes collocated with the parent node based on the PCI.

[0125] In a sixth aspect, in combination with the fifth aspect, the child node is also provided with configuration information about resources used by other nodes to send periodic SSBs.

[0126] In the seventh aspect, in combination with the sixth aspect, the configuration information for each node indicates at least one of the following: the time position of the burst set, the synchronization signal (SS) grid, the periodicity, which SSBs are sent in the burst, or the transmission power.

[0127] In an eighth aspect, in combination with one or more aspects of the first to seventh aspects, the method also includes determining a measurement gap for performing SSB-based interference measurement, wherein the measurement gap corresponds to a time window during which a mobile terminal (MT) function of the child node is not scheduled by a distributed unit (DU) of the parent node.

[0128] In a ninth aspect, in combination with the eighth aspect, the method further includes receiving an indication of a measurement gap from at least one of a parent node or a CU.

[0129] In the tenth aspect, in combination with the ninth aspect, the method further includes transmitting a request for a measurement gap, wherein the indication is received from a parent node or a CU in response to the request.

[0130] In an eleventh aspect, a method for wireless communication by a parent node of a network comprises: determining a synchronization signal block (SSB) resource used by at least one child node of the network for periodic SSB transmission; performing SSB-based interference measurement using the determined resources; and communicating with at least one of the child node, a central unit (CU), or another node of the network based on the SSB-based interference measurement.

[0131] In a twelfth aspect, in combination with the eleventh aspect, the child node, the parent node and the CU are part of an integrated access backhaul (IAB) network.

[0132] In the thirteenth aspect, in combination with one or more of the eleventh and twelfth aspects, the method also includes providing a report having information about SSB-based interference measurements to at least one of the subnodes or CUs of the network.

[0133] In a fourteenth aspect, in combination with one or more aspects of the eleventh to thirteenth aspects, interference measurement is performed using different receive beams, wherein the receive beams are associated with beam directions of distributed units (DUs) of parent nodes.

[0134] In the fifteenth aspect, in combination with the fourteenth aspect, the method also includes receiving signaling indicating different receiving beams from the CU.

[0135] In a sixteenth aspect, in combination with one or more aspects from the eleventh to fifteenth aspects, the method further includes detecting SSB transmission from the subnode based on a cell search process.

[0136] In the seventeenth aspect, in combination with one or more aspects of the eleventh to sixteenth aspects, the parent node is provided with a physical cell identifier (PCI) of one or more distributed units (DUs) of the child node; and the parent node determines resources for one or more other DUs based on the PCI.

[0137] In an eighteenth aspect, in combination with the seventeenth aspect, the parent node is further provided with configuration information about resources used by the DU to send periodic SSBs.

[0138] In the nineteenth aspect, in combination with the eighteenth aspect, the configuration information for each node indicates at least one of the following: the time position of the burst set, the synchronization signal (SS) grid, the periodicity, which SSBs are sent in the SSB burst, or the transmission power.

[0139] In the twentieth aspect, in combination with the nineteenth aspect, the method further includes receiving an indication of a measurement gap from at least one of a grandparent node or a CU.

[0140] In the twenty-first aspect, in combination with one or more aspects from the eleventh to the twentieth aspects, the method further includes determining a measurement gap for performing SSB-based interference measurement.

[0141] In the twenty-second aspect, in combination with the twenty-first aspect, the measurement gap corresponds to a time window during which the mobile terminal (MT) function of the parent node is not scheduled by the distributed unit (DU) of the grandparent node.

[0142] In the twenty-third aspect, in combination with the twenty-second aspect, the method also includes transmitting a request for a measurement gap, wherein the indication is received from a parent node or a CU in response to the request.

[0143] In aspect 24, a method for wireless communication by a central unit (CU) of a network comprises: providing an indication of a synchronization signal block (SSB) resource used by at least one cell associated with a second node of the network for periodic SSB transmission to a first node of the network.

[0144] In the twenty-fifth aspect, in combination with the twenty-fourth aspect, the method also includes providing a measurement configuration to the first node for the second node to perform SSB-based interference measurement using SSB transmission.

[0145] In aspect 26, in combination with one or more aspects of aspects 24 to 25, the first node includes a child node and the second node includes a parent node; or, the first node includes a parent node and the second node includes a child node; and wherein the child node, the parent node and the CU are part of an integrated access backhaul (IAB) network.

[0146] In aspect 27, in combination with one or more aspects of aspects 25 to 26, the measurement configuration indicates at least one of the following: one or more receiving beams to be used for SSB-based interference measurement; or resources to be used for SSB-based interference measurement.

[0147] In aspect 28, in combination with one or more aspects of aspects 25 to 27, the method also includes at least one of the following: providing information indicating a measurement gap for performing SSB-based interference measurement to the first node; providing a report configuration for providing a report with results of SSB-based interference measurement to the first node; receiving a report with results of SSB-based interference measurement from the first node; and configuring at least one of an SSB measurement timing configuration or an SSB transmission configuration (STC) window to enable the first node to measure the SSB sent by the second node.

[0148] In aspect 29, in combination with aspect 28, the method also includes at least one of the following: providing an indication of the reported results to a second node or another node of the network; and using the reported interference measurement results to perform at least one of the following: configuring resources for communications involving nodes in the network or scheduling resources for communications involving nodes in the network.

[0149] The techniques described herein can be used for various wireless communication technologies, such as NR (e.g., 5GNR), 3GPP Long Term Evolution (LTE), LTE-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.

[0150] A CDMA network may implement radio technologies such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. cdma2000 covers IS-2000, IS-95, and IS-856 standards. A TDMA network may implement radio technologies such as Global System for Mobile Communications (GSM). An OFDMA network may implement radio technologies such as NR (e.g., 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE 802.20, Flash-OFDMA, etc. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). LTE and LTE-A are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization called the Third Generation Partnership Project (3GPP). cdma2000 and UMB are described in documents from an organization called "3rd Generation Partnership Project 2" (3GPP2). NR is an emerging wireless communication technology under development.

[0151] In 3GPP, the term "cell" can refer to the coverage area of ​​a Node B (NB) and / or a NB subsystem serving the coverage area, depending on the context in which the term is used. In NR systems, the terms "cell" and BS, next-generation Node B (gNB or gNodeB), access point (AP), distributed unit (DU), carrier, or transmit receive point (TRP) can be used interchangeably. The BS can provide communication coverage for macro cells, pico cells, femto cells, and / or other types of cells. A macro cell can cover a relatively large geographic area (e.g., a radius of several kilometers) and can allow unrestricted access by UEs with service subscriptions. A pico cell can cover a relatively small geographic area and can allow unrestricted access by UEs with service subscriptions. A femto cell can cover a relatively small geographic area (e.g., a home) and can allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell can be called a macro BS. A BS for a pico cell can be called a pico BS. A BS for a femto cell can be called a femto BS or a home BS.

[0152] UE may also be referred to as a mobile station, terminal, access terminal, subscriber unit, station, customer premises equipment (CPE), cellular phone, smart phone, personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop, cordless phone, wireless local loop (WLL) station, tablet, camera, gaming device, netbook, smartbook, ultrabook, home appliance, medical device or medical equipment, biometric sensor / device, wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), entertainment device (e.g., music device, video device, satellite radio), vehicle component or sensor, smart meter / sensor, industrial manufacturing equipment, global positioning system device, or any other suitable device configured to communicate via wireless or wired medium. Some UEs may be considered as machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a base station, another device (e.g., a remote device), or some other entity. For example, a wireless node can provide connectivity to or with a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs can be considered Internet of Things (IoT) devices, which can be narrowband Internet of Things (NB-IoT) devices.

[0153] In some examples, air interface access can be scheduled. A scheduling entity (e.g., BS) allocates resources for communications between some or all devices and equipment within its service area or cell. A scheduling entity may be responsible for scheduling, allocating, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communications, subordinate entities utilize resources allocated by the scheduling entity. The base station is not the only entity that can act as a scheduling entity. In some examples, a UE may act as a scheduling entity and may schedule resources for one or more subordinate entities (e.g., one or more other UEs), and other UEs may utilize the resources scheduled by the UE for wireless communications. In some examples, a UE may act as a scheduling entity in a peer-to-peer (P2P) network and / or a mesh network. In a mesh network example, in addition to communicating with a scheduling entity, UEs may also communicate directly with each other.

[0154] The method disclosed herein includes one or more steps or actions for implementing the method. Without departing from the scope of the claims, the method steps and / or actions can be interchangeable with each other. In other words, unless a specific order of steps or actions is specified, the order and / or use of specific steps and / or actions can be modified without departing from the scope of the claims.

[0155] As used herein, a phrase referring to "at least one" of a series of items refers to any combination of those items (including single members). 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 multiples of the same element (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other order of a, b, and c).

[0156] As used herein, the term "determining" encompasses a wide variety of actions. For example, "determining" may include calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, database, or other data structure), discovering, etc. In addition, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), etc. In addition, "determining" may include solving, selecting, choosing, establishing, etc.

[0157] The foregoing description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. Therefore, the claims are not intended to be limited to the aspects shown herein, but to conform to the full scope of the language of the claims, wherein, unless otherwise specified, the elements mentioned in the singular are not intended to represent "one and only one", but to represent "one or more". Unless otherwise expressly stated, the term "some" refers to one or more. All structural and functional equivalents of the elements of the various aspects described throughout the present disclosure are known or will be known to those of ordinary skill in the art, are expressly incorporated herein by reference and are intended to be covered by the claims. In addition, nothing disclosed herein is intended to be dedicated to the public, regardless of whether such disclosure is explicitly stated in the claims. The elements of the claims should not be interpreted according to the terms of 35 U.S.C. § 112 (f), unless the element is explicitly stated using the phrase "a component for...", or in the case of a method claim, the element is stated using the phrase "a step for...".

[0158] The various operations of the above methods may be performed by any suitable components capable of performing the corresponding functions. These components may include various hardware and / or software components and / or modules, including but not limited to circuits, digital signal processors (DSPs), application specific integrated circuits (ASICs), or processors (e.g., general or specially programmed processors). Generally, where there are operations illustrated in the accompanying drawings, those operations may have corresponding counterpart components plus functional components with similar numbers.

[0159] The various illustrative logical blocks, modules, and circuits described in conjunction with the present disclosure may be implemented or performed with a general purpose processor, a DSP, an ASIC, a 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. A general purpose processor may be a microprocessor, but alternatively, the processor may be any commercially available processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0160] If implemented in hardware, an example hardware configuration may include a processing system in a wireless node. The processing system may be implemented using a bus architecture. The bus may include any number of interconnecting buses and bridges, depending on the specific application and overall design constraints of the processing system. The bus may link various circuits (including processors, machine-readable media, and bus interfaces) together. The bus interface may be used to connect a network adapter, etc., to the processing system via the bus. The network adapter may be used to implement signal processing functions at the physical (PHY) layer. In the case of a user terminal (see Figure 1 ), a user interface (e.g., keyboard, display, mouse, joystick, etc.) may also be connected to the bus. The bus may also link various other circuits (such as timing sources, peripherals, voltage regulators, power management circuits, etc.), which are well known in the art and therefore will not be described further. The processor may be implemented with one or more general and / or special purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuits that can execute software. Those skilled in the art will recognize how best to implement the described functions of the processing system based on the specific application and the overall design constraints imposed on the entire system.

[0161] If implemented in software, the function may be stored on a computer-readable medium as one or more instructions or codes or transmitted as one or more instructions or codes. Whether referred to as software, firmware, middleware, microcode, hardware description language or other, software should be broadly interpreted as representing instructions, data or any combination thereof. Computer-readable media include both computer storage media and communication media, and the communication media include any media that helps to transfer a computer program from one place to another. The processor may be responsible for managing the bus and general processing, including executing software modules stored on a machine-readable storage medium. A computer-readable storage medium may be coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium. Alternatively, the storage medium may be integrated into the processor. As an example, a machine-readable medium may include a transmission line, a carrier modulated by data, and / or a computer-readable storage medium having instructions separated from a wireless node stored thereon, all of which may be accessed by the processor through a bus interface. Alternatively or additionally, a machine-readable medium or any part thereof may be integrated into a processor (such as a case where a cache and / or a general register file may be provided). Examples of machine-readable storage media may include, for example, 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, magnetic disks, optical disks, hard drives, or any other suitable storage media or any combination thereof. The machine-readable medium may be implemented in a computer program product.

[0162] A software module may include a single instruction or multiple instructions, and may be distributed over several different code segments, between different programs, and across multiple storage media. A computer-readable medium may include multiple software modules. A software module includes instructions that, when executed by a device such as a processor, cause a processing system to perform various functions. A software module may include a sending module and a receiving module. Each software module may reside in a single storage device or be distributed in multiple storage devices. For example, when a triggering event occurs, a software module may be loaded from a hard drive into a RAM. During the execution of a software module, a processor may load some instructions into a cache to increase access speed. One or more cache lines may then be loaded into a general register file for execution by a processor. When the functions of a software module are mentioned below, it will be understood that such functions are implemented by a processor when executing instructions from the software module.

[0163] Additionally, any connection is properly termed a computer-readable medium. For example, if a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technology (such as infrared (IR), radio, and microwave) is used, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technology (such as infrared, radio, and microwave) are included in the definition of medium. As used herein, disk and disc include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Blu-ray Optical disks, where magnetic disks typically reproduce data magnetically, and optical disks reproduce data optically using lasers. Thus, in some aspects, computer-readable media may include non-transitory computer-readable media (e.g., tangible media). Additionally, for other aspects, computer-readable media may include temporary computer-readable media (e.g., signals). Combinations of the above should also be included within the scope of computer-readable media.

[0164] Thus, certain aspects may include a computer program product for performing the operations presented herein. For example, such a computer program product may include a computer-readable medium with instructions stored (and / or encoded) thereon, which instructions may be executed by one or more processors to perform the operations described herein, such as for performing the operations described herein and Figures 7 to 9 The operations are shown in the instructions.

[0165] It should also be understood that the modules and / or other appropriate components for performing the methods and techniques described herein can be downloaded and / or otherwise obtained by a user terminal and / or base station (if applicable). For example, such a device can be coupled to a server to facilitate the delivery of components for performing the methods described herein. Alternatively, the various methods described herein can be provided via a storage component (e.g., RAM, ROM, physical storage media such as a compact disc (CD) or a floppy disk), so that the user terminal and / or base station can obtain the various methods when the storage component is coupled to or provided to the device. In addition, any other suitable technology for providing the methods and techniques described herein to the device can be used.

[0166] It is to be understood that the claims are not limited to the precise configuration and components illustrated above. Various modifications, changes and variations may be made in the arrangement, operation and details of the methods and apparatus described above without departing from the scope of the claims.

Claims

1. A device for wireless communication by a first node of an integrated access backhaul (IAB) network, comprising: One or more processors, individually or collectively configured to execute instructions stored on one or more memories, and cause the first node to: determining SSB resources used by one or more second nodes of the IAB network for periodic synchronization signal block (SSB) transmission; performing SSB-based measurements of one or more cells using the determined SSB resources; as well as Based on the SSB-based measurements of the one or more cells, communicating with at least one of the second nodes using a backhaul link.

2. The device according to claim 1, wherein: The periodic SSB transmission includes periodic cell definition CD-SSB transmission.

3. The device according to claim 2, wherein: Each CD-SSB transmission is associated with a cell identifier ID.

4. The device according to claim 3, wherein: The cell ID includes a physical cell identifier PCI.

5. The device according to claim 1, wherein: The first node determines the SSB resource based on information received from a central node.

6. The device according to claim 1, wherein: The periodic SSB transmission includes periodic radio resource management RRM-SSB transmission.

7. The device according to claim 1, wherein: The one or more processors are also configured, individually or collectively, to execute instructions stored on the one or more memories and cause the first node to process the SSB-based measurements to obtain interference information about the one or more cells.

8. The device according to claim 7, wherein: The processing includes generating an interference matrix based on the SSB-based measurements.

9. An apparatus for wireless communication by a central unit CU of an integrated access backhaul IAB network, comprising: One or more processors, individually or collectively configured to execute instructions stored in one or more memories and cause the CU to: obtaining information about SSB resources used by one or more second nodes of the IAB network for periodic synchronization signal block (SSB) transmissions; and The information is provided to a first node of the IAB network using a backhaul link.

10. The device according to claim 9, wherein: The periodic SSB transmission includes periodic cell definition CD-SSB transmission.

11. The device according to claim 10, wherein: Each CD-SSB transmission is associated with a cell identifier ID.

12. The device according to claim 11, wherein The cell ID includes a physical cell identifier PCI.

13. The device according to claim 9, wherein: The periodic SSB transmission includes periodic radio resource management RRM-SSB transmission.

14. A method for wireless communication by a first node of an integrated access backhaul (IAB) network, comprising: determining SSB resources used by one or more second nodes of the IAB network for periodic synchronization signal block (SSB) transmission; performing SSB-based measurements of one or more cells using the determined SSB resources; as well as Based on the SSB-based measurements of the one or more cells, communicating with at least one of the second nodes using a backhaul link.

15. The method according to claim 14, wherein: The periodic SSB transmission includes periodic cell definition CD-SSB transmission.

16. The method according to claim 15, wherein: Each CD-SSB transmission is associated with a cell identifier ID.

17. The method according to claim 14, further comprising: The SSB-based measurements are processed to obtain interference information about the one or more cells.

18. A method for wireless communication by a central unit CU of an integrated access backhaul IAB network, comprising: obtaining information about SSB resources used by one or more second nodes of the IAB network for periodic synchronization signal block (SSB) transmissions; and The information is provided to a first node of the IAB network using a backhaul link.

19. The method according to claim 18, wherein: The periodic SSB transmission includes periodic cell definition CD-SSB transmission.

20. The method according to claim 19, wherein: Each CD-SSB transmission is associated with a cell identifier ID.

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