Beam and cell selection based on power configuration

Abstract

Various aspects of the present disclosure provide techniques for beam and cell selection based on power configuration of a wireless node (e.g., an integrated access and backhaul (IAB) node. In some cases, the node monitors synchronization signal block (SSB) transmissions from one or more network entities and selects a beam or cell based on the monitoring and one or more metrics designed to limit potential interference caused by uplink transmissions from a first node.

Description

[0001] Claiming priority

[0002] This application claims priority to U.S. Application No. 17 / 115,728, filed on December 8, 2020, which claims the benefit of priority to U.S. Provisional Application No. 62 / 945,862, filed on December 9, 2019, the entire contents of both of which are expressly incorporated herein by reference as if fully set forth below and for all applicable purposes. Technical Field

[0003] Various aspects of the present disclosure relate to wireless communication systems, and more particularly, various aspects of the present disclosure relate to techniques for beam and cell selection based on Integrated Access and Backhaul (IAB) node transmit power configuration. Background Art

[0004] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcast, etc. 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, Advanced LTE (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, etc.

[0005] In some examples, a wireless multiple access communication system may include multiple base stations (BSs), each of which is capable of simultaneously supporting communications for multiple communication devices (also referred to as user equipment (UE)). In an LTE or LTE-A network, a set of one or more base stations may define an evolved Node B (eNB). In other examples (e.g., in a next generation, new radio (NR) or 5G network), a wireless multiple access communication system may include multiple distributed units (DUs) (e.g., edge units (EUs), edge nodes (ENs), radio heads (RHs), smart radio heads (SRHs), transmit receive points (TRPs), etc.) communicating with multiple central units (CUs) (e.g., central nodes (CNs), access node controllers (ANCs), etc.), wherein a set of one or more DUs communicating with a CU may define an access node (e.g., which may be referred to as a BS, a next generation Node B (gNB or gNodeB), a TRP, etc.). A BS or DU may communicate with a set of UEs on a downlink channel (e.g., for transmissions from a BS or DU to a UE) and an uplink channel (e.g., for transmissions from a UE to a BS or DU).

[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 a city, country, region, and even global level. New radio (e.g., 5G NR) is an example of an emerging telecommunication standard. NR is an enhancement set to the LTE mobile standard released by 3GPP. NR is designed to better integrate with other open standards by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and using OFDMA with cyclic prefix (CP) on the downlink (DL) and on the uplink (UL), thereby better supporting mobile broadband Internet access. To this end, NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

[0007] As the demand for mobile broadband access continues to grow, there is a need for further improvements to NR and LTE technologies. 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 aspect of which is solely responsible for its desirable attributes. Without limiting the scope of the present disclosure as expressed by the claims that follow, some features will now be briefly discussed. After considering this discussion, and particularly after reading the section entitled "Detailed Description," those skilled in the art 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 first node (e.g., a UE or MU of an integrated access and backhaul (IAB) network). In general, the method includes: monitoring synchronization signal block (SSB) transmissions from one or more network entities; and selecting a beam or cell associated with one of the one or more network entities based on the monitoring and one or more metrics associated with the monitored SSB transmissions, the one or more metrics indicating potential interference caused by uplink transmissions from the first node.

[0010] Certain aspects of the present disclosure relate to an apparatus for wireless communication by a first node in an IAB. In general, the apparatus includes a memory and at least one processor coupled to the memory, the memory and the at least one processor configured to: monitor SSB transmissions from one or more network entities; and select a beam or cell associated with one of the one or more network entities based on the monitoring and one or more metrics associated with the monitored SSB transmissions, the one or more metrics indicating potential interference caused by uplink transmissions from the first node.

[0011] Certain aspects of the present disclosure relate to an apparatus for wireless communication by a first node in an IAB. In general, the apparatus includes: means for monitoring SSB transmissions from one or more network entities; and means for selecting a beam or cell associated with one of the one or more network entities based on the monitoring and one or more metrics associated with the monitored SSB transmissions, the one or more metrics indicating potential interference caused by uplink transmissions from the first node.

[0012] Certain aspects of the present disclosure relate to a computer-readable medium having instructions stored thereon for performing the following operations: monitoring SSB transmissions from one or more network entities; and selecting a beam or cell associated with one of the one or more network entities based on the monitoring and one or more metrics associated with the monitored SSB transmissions, the one or more metrics indicating potential interference caused by uplink transmissions from the first node.

[0013] Certain aspects provide a method for wireless communication by a network entity (e.g., a parent node / DU or CU of an integrated access and backhaul (IAB) network). In summary, the method includes: determining a configuration of one or more metrics associated with SSB transmissions monitored by a first node of one or more wireless nodes for selecting a beam or cell, wherein the one or more metrics indicate potential interference caused by uplink transmissions from the first node; and sending an indication of the configuration to the first node.

[0014] Certain aspects of the present disclosure relate to an apparatus for wireless communication by a first node in a network entity. In general, the apparatus includes a memory and at least one processor coupled to the memory, the memory and the at least one processor configured to: determine a configuration of one or more metrics associated with SSB transmissions monitored by a first node in one or more wireless nodes for selecting a beam or cell, wherein the one or more metrics indicate potential interference caused by uplink transmissions from the first node; and send an indication of the configuration to the first node.

[0015] Certain aspects of the present disclosure relate to an apparatus for wireless communication by a first node in a network entity. In general, the apparatus includes: means for determining a configuration of one or more metrics associated with SSB transmissions monitored by a first node in one or more wireless nodes for selecting a beam or cell, wherein the one or more metrics indicate potential interference caused by uplink transmissions from the first node; and means for sending an indication of the configuration to the first node.

[0016] Certain aspects of the present disclosure relate to a computer-readable medium having instructions stored thereon for performing the following operations: determining a configuration of one or more metrics associated with SSB transmissions monitored by a first node among one or more wireless nodes for selecting a beam or cell, wherein the one or more metrics indicate potential interference caused by uplink transmissions from the first node; and sending an indication of the configuration to the first node.

[0017] To achieve the aforementioned and related purposes, one or more aspects include the features fully described below and particularly pointed out in the claims. The following description and the accompanying drawings set forth in detail certain illustrative features of one or more aspects. However, these features indicate only some of the various ways in which the principles of the various aspects can be employed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By reference to some of the various aspects shown in the accompanying drawings, a more specific description briefly summarized above can be provided so that the above-mentioned features of the present disclosure can be understood in detail. However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and are therefore not to be considered as limiting the scope thereof, as the description may allow for other equally effective aspects.

[0019] Figure 1 is a block diagram conceptually illustrating an example telecommunications system in accordance with certain aspects of the present disclosure.

[0020] 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.

[0021] Figure 3 is a diagram illustrating an example of a wireless access network in accordance with various aspects of the present disclosure.

[0022] Figure 4 is a diagram illustrating an example of an integrated access and backhaul (IAB) network architecture in accordance with various aspects of the present disclosure.

[0023] Figures 5A-5D Example power requirements are shown.

[0024] Figure 6 A flow chart illustrating example operations for wireless communications by a first node of an integrated access and backhaul (IAB) network is shown in accordance with various aspects of the present disclosure.

[0025] Figure 7 A flow diagram illustrating example operations for wireless communications by a network entity of an integrated access and backhaul (IAB) network is shown in accordance with various aspects of the present disclosure.

[0026] Figure 8 A communication device in accordance with aspects of the present disclosure is shown, which may include various components configured to perform operations for the techniques disclosed herein.

[0027] Fig. 9 A communication device in accordance with aspects of the present disclosure is shown, which may include various components configured to perform operations for the techniques disclosed herein.

[0028] 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

[0029] Various aspects of the present disclosure provide techniques for beam and cell selection based on integrated access and backhaul (IAB) node power configuration. In some cases, the IAB node monitors synchronization signal block (SSB) transmissions from one or more network entities and selects a beam or cell based on the monitoring and one or more metrics designed to limit potential interference caused by uplink transmissions from a first node.

[0030] The following description provides examples, rather than limitations on the scope, applicability or examples set forth in the claims. Changes may be made in the functions and arrangements of the elements discussed without departing from the scope of the present disclosure. Various processes or components may be omitted, replaced or added to each example as appropriate. For example, the method described may be performed in an order different from the order described, and various steps may be added, omitted or combined. In addition, the features described with respect to some examples may be combined in some other examples. For example, using any number of aspects set forth herein, a device may be implemented or a method may be practiced. 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 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" is used herein to mean "used as an example, instance or illustration". Any aspect described as "exemplary" herein is not necessarily interpreted as being preferred or having advantages over other aspects.

[0031] Typically, 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, frequency 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. In some cases, 5G NR RAT networks can be deployed.

[0032] Figure 1 An example wireless communication network 100 is shown in which aspects of the present disclosure may be performed. For example, the network 100 may include a network configured to perform Figure 6 The IAB node (implemented as UE 120 or BS 110) of operation 600 and configured to perform Figure 7 7. A network entity (eg, BS 110) of operation 700 may be configured to perform the operations described above.

[0033] like Figure 1As shown, the wireless communication network 100 may include multiple base stations (BSs) 110a-z (each also individually referred to herein as BS 110 or collectively referred to as BS 110) and other network entities. BS 110 may provide communication coverage for a particular geographic area (sometimes referred to as a "cell"), which may be fixed or may move depending on the location of the mobile BS 110. In some examples, BS 110 may be interconnected with each other and / or with one or more other BSs or network nodes (not shown) in the wireless communication network 100 through various types of backhaul interfaces (e.g., direct physical connections, wireless connections, virtual networks, etc.) using any suitable transport network. Figure 1 In the illustrated example, 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. BS 110 communicates with user equipment (UE) 120a-y (each also individually referred to herein as UE 120 or collectively referred to as UE 120) in wireless communication network 100. UE 120 (e.g., 120x, 120y, etc.) may be dispersed throughout wireless communication network 100, and each UE 120 may be stationary or mobile.

[0034] The wireless communication network 100 may also include a relay station (e.g., relay station 110r) (also referred to as a repeater, etc.) that receives transmissions of data and / or other information from an upstream station (e.g., BS 110a or UE 120r) and sends transmissions of data and / or other information to a downstream station (e.g., UE 120 or BS 110), or relays transmissions between UEs 120 to facilitate communication between devices.

[0035] A network controller 130 may couple to a set of BSs 110 and provide coordination and control for these BSs 110. The network controller 130 may communicate with the BSs 110 via a backhaul. The BSs 110 may also communicate with each other (eg, directly or indirectly) via a wireless or wired backhaul.

[0036] Figure 2 BS 110 and UE 120 (eg, Figure 1100) that can be used to implement aspects of the present disclosure. For example, antenna 252, processors 266, 258, 264, and / or controller / processor 280 of UE 120 and / or antenna 234, processors 220, 230, 238, and / or controller / processor 240 of BS 110 can be used to perform the various techniques and methods described herein.

[0037] It should be noted that although Figure 2 UE 120 is shown communicating with BS 110, but a child IAB node may similarly communicate with a parent IAB node (or other network entity), and each may (eg, respectively) have a plurality of network elements as described above. Figure 2 In other words, the child IAB node may have similar components as the UE 120 and may be configured to perform Figure 6 The parent IAB node (or other network entity) may have similar components as the BS 110 and may be configured to perform Figure 7 Operation 700.

[0038] At BS 110, a transmit processor 220 may receive data from a data source 212 and control information from a controller / processor 240. The control information may be 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 for a physical downlink shared channel (PDSCH), etc. The processor 220 may process (e.g., encode and symbol map) the data and the control information, respectively, to obtain data symbols and control symbols. The transmit processor 220 may also generate reference symbols, such as for a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a cell-specific reference signal (CRS). A 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, if applicable, and may provide an output symbol stream to modulators (MODs) 232a-232t. Each modulator 232 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 upconvert) the output sample stream to obtain a downlink signal. The downlink signals from modulators 232a-232t may be transmitted via antennas 234a-234t, respectively.

[0039] At UE 120, antennas 252a-252r can receive downlink signals from BS 110 or parent IAB nodes, or child IAB nodes can receive downlink signals from parent IAB nodes, and can provide received signals to demodulators (DEMOD) 254a-254r in transceivers, respectively. Each demodulator 254 can adjust (e.g., filter, amplify, downconvert, and digitize) the corresponding received signal to obtain input samples. Each demodulator can further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. MIMO detector 256 can obtain received symbols from all demodulators 254a-254r, perform MIMO detection on the received symbols (if applicable), and provide detected symbols. Receive processor 258 can process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for UE 120 to data sink 260, and provide decoded control information to controller / processor 280.

[0040] On the uplink, at the UE 120 or child IAB node, the transmit processor 264 may receive and process data from a data source 262 (e.g., for a physical uplink shared channel (PUSCH) or PSSCH) and control information from a 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 demodulators 254a-254r in the transceiver (e.g., for SC-FDM, etc.), and transmitted to the BS 110 or parent IAB node.

[0041] At BS 110 or a parent IAB node, the uplink signal from UE 120 may be received by an antenna, processed by modulator 232, detected by MIMO detector 236 (if applicable), and further processed by receive processor 238 to obtain decoded data and control information sent by UE 120. Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to a controller / processor 240.

[0042] Controllers / processors 240 and 280 may direct the operation at BS 110 and UE 120, respectively. Controller / processor 240 and / or other processors and modules at BS 110 may perform or direct the execution of processes for the techniques described herein. Controller / processor 280 and / or other processors and modules at UE 120 may perform or direct the execution of processes for the techniques described herein. Memories 242 and 282 may store data and program codes for BS 110 and UE 120, respectively. Scheduler 244 may schedule UEs for data transmission on the downlink and / or uplink.

[0043] Figure 3 is a diagram illustrating an example of a wireless access network in accordance with various aspects of the present disclosure.

[0044] As shown by reference numeral 305, a traditional (e.g., 3G, 4G, LTE) wireless access network may include multiple base stations 310 (e.g., access nodes (ANs)), wherein each base station 310 communicates with a core network via a wired backhaul link 315 (such as a fiber optic connection). The base station 310 may communicate with a UE 320 via an access link 325 (which may be a wireless link). In some aspects, Figure 3 The base station 310 shown in FIG. Figure 1 Similarly, Figure 3 The UE 320 shown in FIG. 1 may correspond to Figure 1 UE 120 is shown in FIG.

[0045] As shown in the figure numeral 330, the wireless 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 and backhaul (IAB) network. The IAB network may include multiple base stations, and sometimes the base stations may have different types or have different operating characteristics. For example, in some aspects, the IAB network may have at least one base station as an anchor base station 335. The anchor base station may communicate with the core network via a wired backhaul link 340 (such as an optical fiber connection). The anchor base station 335 may also be referred to as an IAB donor. The anchor base station may be configured to communicate with other types of base stations or other communication devices (e.g., in a wireless network or an IAB network).

[0046] The IAB network may also include one or more non-anchor base stations 345. Non-anchor base stations may sometimes be referred to as relay base stations or IAB nodes. The non-anchor base station 345 may communicate with the anchor base station 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 base station 335 or the non-anchor base station 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 base station 335 or the non-anchor base station 345 shown in FIG. Figure 1 Similarly, Figure 3 The UE 355 shown in FIG. 3 may correspond to Figure 1 UE 120 is shown in FIG.

[0047] As shown in the reference numeral 365, in some aspects, a wireless access network including an IAB network can utilize various spectrum types. For example, an IAB network can utilize various different radio frequency bands. In some specific examples and according to some aspects, millimeter wave technology or directional communication can be used for communication (e.g., beamforming, precoding) 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 base stations can use millimeter waves to carry information or can use beamforming, precoding to be directed toward a target base station. Similarly, a wireless access link 375 between a UE and a base station can use millimeter waves or can be directed toward a target wireless node (e.g., a UE or a base station). In this way, inter-link interference can be reduced.

[0048] 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., 5G / NR). 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.

[0049] In some aspects, the IAB donor may include a central unit (CU) that configures IAB nodes that access a core network via the IAB donor, and may include a distributed unit (DU) that schedules and communicates with child nodes of the IAB donor.

[0050] In some aspects, the IAB node may include a mobile terminal component (MT) scheduled by and communicating with a DU of a parent node, and may include a DU that schedules and communicates with a child node of the IAB node. The DU of the IAB node may perform the functions described in conjunction with the base station 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.

[0051] Figure 4 is a 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 connected to the core network via a wired connection (e.g., 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, the IAB donor 405 may include a base station 110, such as an anchor base station, as described above in conjunction with Figure 3 As shown in the figure, the IAB donor 405 may include a CU, which may perform an ANC function or an AMF function. The CU may configure the DU of the IAB donor 405 or may configure one or more IAB nodes 410 (e.g., MT and / 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, for example, by using a control message or a configuration message (e.g., a radio resource control (RRC) configuration message, an F1 application protocol (F1AP) message).

[0052] As described above, the IAB network may include an IAB node 410 (shown as IAB nodes 1 to 4) 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. The DU of 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, the DU may be referred to as a scheduling node or a scheduling component, and the MT may be referred to as a scheduled node or a scheduled component. In some aspects, the IAB donor 405 may include a DU without including an MT. That is, the IAB donor 405 may configure, control or schedule the communication of the IAB node 410 or the UE 120. The UE 120 may include only an MT without including 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).

[0053] 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 a first node provides a DU function for an MT of a 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.

[0054] like Figure 4 As further shown, the links between UE 120 and IAB donor 405 or between UE 120 and IAB node 410 may be referred to as access links 415. Each access link 415 may be a wireless access link that provides UE 120 with wireless access to a core network via IAB donor 405 and potentially via one or more IAB nodes 410.

[0055] like Figure 4As further shown, the link between the IAB donor 405 and the IAB node 410 or between two IAB nodes 410 may be referred to as a backhaul link 420. Each backhaul link 420 may be a wireless backhaul link that provides wireless access to the core network to the IAB node 410 via the IAB donor 405 and potentially via one or more other intermediate IAB nodes 410. In some aspects, the backhaul link 420 may be a primary backhaul link or an auxiliary backhaul link (e.g., a backup backhaul link). In some aspects, the auxiliary backhaul link may be used if the primary backhaul link fails, becomes congested, or becomes overloaded. In the IAB network, network resources (e.g., time resources, frequency resources, space resources) for wireless communication may be shared between the access link 415 and the backhaul link 420.

[0056] As described above, in a typical IAB network, the IAB nodes (e.g., non-anchor base stations) are stationary (i.e., non-mobile). The goal of the next generation (5G) wireless networks is to provide ultra-high data rates and support a wide range of application scenarios. The Integrated Access and Backhaul (IAB) system has been studied in 3GPP as a possible solution to help support these goals.

[0057] As mentioned above, in IAB, a wireless backhaul solution is adopted to connect cells (IAB nodes) to the core network (which uses wired backhaul). Some attractive features of IAB are support for multi-hop wireless backhaul, sharing the same technology (e.g., NR) and resources (e.g., frequency band) for both access and backhaul links.

[0058] There are various possible architectures for IAB nodes, including Layer 2 (L2) and Layer 3 (L3) solutions, and the specific architecture deployed may depend on what layers of the protocol stack are implemented in the intermediate node (IAB node), for example, an L2 relay may implement the PHY / MAC / RLC layers.

[0059] Example IAB Power Configuration

[0060] Various aspects of the present disclosure provide techniques for addressing scenarios where the minimum transmit power supported by an integrated access and backhaul (IAB) node is higher than the minimum value specified by a standard. In some cases, an IAB node may signal information about its power configuration so that a network entity of the IAB may take the power configuration into account (e.g., when allocating or scheduling resources). The power configuration may include an indication of the minimum transmit power supported by the IAB node and / or an indication of a guard band that may help the IAB node control adjacent channel leakage.

[0061] Standard specifications (e.g., 3GPP TS 38.101) define minimum output (transmit) power requirements for UEs. These values ​​vary by frequency band and operating channel within the band. For example, Figure 5A 5B and 5C show example minimum output power requirements for frequency range 2 (FR2) including the frequency band from 24.25 GHz to 52.6 GHz. Figure 5B and 5C As shown, the minimum output power requirement also depends on the power level ( Figure 5B shows the value of power level 1, while Figure 5C Values ​​for power levels 2, 3, and 4 are shown). There may also be requirements for adjacent channel leakage rate (ACLR) (e.g., the ratio of the filtered average power centered on the assigned channel frequency to the filtered average power centered on the adjacent channel frequency). Base stations may also have power configuration requirements. For example, Figure 5D The minimum requirement for the resource element (RE) power dynamic control range is shown.

[0062] In some scenarios, IAB MTs may not be able to support the minimum output power requirements specified by the standard. For example, if a shared architecture is used for both MTs and DUs of an IAB node, the MTs and DUs will have the same power configuration and capabilities. Conventionally, DUs (similar to BSs) have large output power and very limited dynamic range (BS minimum TX power may still be relatively high). For MTs sharing the same architecture, the minimum transmit power supported by the MTs may be higher than the minimum requirement specified in the standard.

[0063] Making the minimum power supported by the MT higher than the requirements specified in the standards may cause various problems. For example, the MT may not be able to perform appropriate UL power control for the MT. As a result, the UL transmission of the MT may cause interference in the same and adjacent channels.

[0064] To address interference in the same channel, interference mitigation techniques can be used, but at a cost. For example, to mitigate intra-cell interference, the scheduler may not be able to frequency-division multiplex (FDM) another UL communication. To mitigate inter-cell (co-channel) interference, relatively complex inter-cell interference coordination (ICIC) techniques can be used.

[0065] As mentioned above, to address adjacent channel interference, the standard specification may have ACLR requirements. According to these requirements, the transmitter should suppress its leakage to the adjacent channel to a certain acceptable level by applying appropriate filters. Unfortunately, with larger minimum transmit powers, it is more difficult to control leakage to adjacent channels. Although this can be solved by tightening the ACLR requirements for MT to ensure that adjacent channel leakage is still controlled, this may require more aggressive filtering at the MT transmitter (which may significantly increase costs).

[0066] In some cases, signaling may be introduced to allow a device (e.g., an IAB node) to indicate its minimum supported TX power to the network. For example, the signaling may be provided by adding a new element of power level, or the device may indicate the signaling to the network separately (e.g., via an RRC message). The signaling may provide an indication of the minimum TX power as a metric (e.g., in terms of effective isotropic radiated power (EIRP) and / or total radiated power (TRP)). As described above, the minimum TX power may be configured for different operating frequency bands and / or channel bandwidths.

[0067] Given the indication that the minimum TX power supported by the MT may be greater than the minimum specified in the standard, the network may take this into account when scheduling and / or allocating resources for UL transmissions from the MT. For example, the base station (IAB DU) may schedule UL transmissions to occur in the center of the channel. Scheduling in this manner and leaving sufficient guard bands at the edges may help suppress adjacent channel leakage.

[0068] In some cases, the MT may indicate a guard band sufficient to meet the ACLR specification. For example, the MT may indicate that if the target TX power is less than the minimum TX power it supports, the MT may need a number (N_RB) of RBs as guard bands (for "backoff") to meet the ACLR specification. In some cases, the standard specification may indicate a limit on the maximum value of N_RB. In some cases, the value of N_RB indicated by the MT and / or the limit on the maximum value of N_RB may be band-dependent and / or channel bandwidth-dependent.

[0069] In some cases, instead of indicating the guard band in terms of the number of RBs, the MT may provide a similar indication in terms of frequency resources, such as bandwidth part (BWP). For example, the MT may indicate the maximum BWP that the MT can support (e.g., assuming it is centered around the channel BW, or around a configured / indicated offset).

[0070] In some cases, the MT may not provide a prior indication of a BWP, but may be configured with one or more BWPs. In such a case, the MT may provide some indication as to whether it can support the configured BWP.

[0071] The UL transmission of the MT need not always be centered in the center of the channel BW. For example, in some cases, there may be no other networks operating on adjacent channels on one or either side of the current channel. As another example, with sufficient guard band, leakage may be kept below a desired level even if the transmitted UL signal is not in the center of the channel BW.

[0072] Thus, the UL assignment of the MT may be flexibly configured in a BWP that is not in the center.In some cases, the MT may provide additional assistance information (eg, to assist scheduling), such as a desired (or required) guard band for a given center frequency.

[0073] The actual N_RB or BWP indicated by the MT may depend on the amount of power mismatch (e.g., minimum supported TX power - target TX power). For example, the indicated value may correspond to the maximum power mismatch (e.g., minimum supported TX power - minimum TX power specified by the standard). As another example, a set of indications for various mismatch values ​​may be provided.

[0074] Example beam and cell selection based on power configuration

[0075] As previously mentioned, some types of wireless devices, such as integrated access backhaul (IAB) mobile terminals (MTs), may not be able to support minimum output power requirements (e.g., in the case where a shared architecture is used for both MTs and distributed units (DUs) of IAB nodes). Signaling (e.g., radio resource control (RRC) of a new power level) may be used to indicate the minimum transmit power of the IAB MTs. Excessive interference (both intra-cell and inter-cell (e.g., co-channel) interference) caused by such a larger transmit power than the minimum transmit power of the IAB MTs may require appropriate or coordinated resource allocation and scheduling. For adjacent channel interference, large guard bands may be used to further suppress leakage to adjacent channels.

[0076] In some scenarios, such as for random access channel (RACH) configuration, the network (e.g., a network entity) may configure an initial uplink (UL) bandwidth part (BWP) and / or RACH resources / configuration based on the MT's power configuration (e.g., minimum supported transmit power).

[0077] In some cases, the minimum transmit power supported by an IAB MT is greater than the minimum transmit power specified in the standard, but the IAB MT may still meet the adjacent channel leakage rate (ACLR) requirements (e.g., through filtering). However, if its UL transmit power is not properly controlled, the increased transmission power may still cause interference (e.g., in the same cell).

[0078] Therefore, when selecting beams or cells and / or evaluating the quality of cells, it may be desirable for an IAB MT to be aware of the potential interference it may cause and to take steps to avoid such potential interference.

[0079] Typically, during cell selection and / or reselection, the UE searches for synchronization signal blocks (SSBs) to detect new cells. The UE may have a priori knowledge of the resources / configuration (e.g., physical cell identifier (PCI)) for detecting new cells. In addition, the UE may measure the detected SSBs to determine the quality of the cell, SSB, and / or beam used for communication. For initial cell selection, the UE selects any cell in which it has detected an SSB. If the UE detects multiple cells, the UE may select a cell based on signal strength (e.g., selecting the cell with the maximum signal strength). For cell reselection, the UE measures the quality of service and the detected cells (e.g., based on the detected SSBs), and checks the cell reselection criteria.

[0080] Various aspects of the present disclosure provide techniques that can be used to help mitigate adverse effects when an IAB MT (also referred to herein as an MT) is unable to support a minimum output power requirement. For example, an IAB MT can select a beam or cell based on one or more metrics to limit potential interference caused by monitoring (and detecting) SSB transmissions from one or more network entities. In some cases, an IAB MT can select a beam or cell based on one or more thresholds associated with received signal power to limit potential interference. Although the techniques presented herein are described with respect to an IAB network and corresponding nodes, these techniques can be more generally applied to any type of wireless node (e.g., generally to a UE and / or base station (BS)).

[0081] Figure 6 6 is a flow diagram illustrating example operations 600 for wireless communications by a first node (e.g., of an integrated access and backhaul (IAB) network) in accordance with certain aspects of the present disclosure. For example, operations 600 may be performed by a parent IAB node. Operations 600 may be implemented as a process on one or more processors (e.g., Figure 2 In addition, the communication may be performed, for example, via one or more antennas (e.g., Figure 2The first wireless communication device may transmit and receive signals in operation 600 using an antenna 234 of the wireless communication device. In some aspects, the first wireless communication device may transmit and / or receive signals via a bus interface of one or more processors (e.g., controllers / processors 230, 220, 238, 240, and 244) that obtains and / or outputs signals.

[0082] At 602, operations 600 may begin by monitoring SSB transmissions from one or more network entities. At 604, the first node selects a beam or cell associated with one of the one or more network entities based on the monitoring and one or more metrics associated with the monitored SSB transmissions, the one or more metrics indicating potential interference caused by uplink transmissions from the first node.

[0083] Figure 7 700 is a flow diagram illustrating example operations 700 for wireless communications by a network entity (e.g., a DU or CU of an integrated access and backhaul (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, the communication may be performed, for example, via one or more antennas (e.g., Figure 2 The first wireless communication device may transmit and receive signals in operation 700 using antenna 252 of the wireless communication device. In some aspects, the transmission and / or reception of signals by the first wireless communication device may be implemented via a bus interface of one or more processors (e.g., controllers / processors 258, 264, 266, and / or 280) that obtains and / or outputs signals.

[0084] At 702, operations 700 begin by determining a configuration of one or more metrics associated with SSB transmissions monitored by a first node of one or more wireless nodes for selecting a beam or cell, wherein the one or more metrics indicate potential interference caused by uplink transmissions from the first node. At 704, the network entity sends an indication of the configuration to the first node.

[0085] In some aspects, the MT searches for a suitable cell for reselection, taking into account its increased minimum transmit power (e.g., relative to the standard). If at least one beam can be found that will not cause excessive interference in the UL, the cell can be considered suitable. If the MT uses the minimum transmit power and the corresponding beam, excessive interference can be defined based on a threshold of the estimated UL received power (e.g., threshold X). In some aspects, the MT evaluates a quality metric of a suitable cell based on SS-RSRP and / or synchronization signal (SS) reference signal received quality (SS-RSRQ). Consider those SSBs for which the use of the associated beam on the UL will not cause excessive interference (e.g., having a received power above threshold X).

[0086] In some aspects, the MT selects an SSB and an associated RACH when accessing a selected or detected cell. The MT determines another threshold (e.g., threshold Y), and if at least one SSB with SS-RSRP is less than threshold Y, the MT may select an SSB with the lowest SS-RSRP among other SSBs below threshold Y. However, if all detected SSBs with SS-RSRP are greater than threshold Y, the MT may select the weakest SSB (e.g., with the lowest SS-RSRP) to send RACH. In this case, the MT may adopt a modified RACH configuration. For example, the MT may reduce the maximum number of retransmissions and / or not allow retransmissions at all. In some aspects, if all detected SSBs with SS-RSRP for a cell are greater than a threshold, the MT may not send RACH to the selected cell at all.

[0087] In some aspects, the threshold values ​​(e.g., threshold X and threshold Y) may be the same or different. The threshold values ​​may be defined by a standard specification or indicated by the network (e.g., via RRC configuration signaling). In some cases, the thresholds may be calculated by the MT. For example, the thresholds may be calculated by the MT based on the RACH configuration of the cell (e.g., including RACH target received power).

[0088] In some cases, the calculations performed by the IAB MT may depend on the RACH target receiver power after a certain number of power ramp steps. The certain number of power ramp steps may be zero or indicated and / or configured.

[0089] In some cases, the RACH target received power may be the initial random access preamble power (e.g., preambleReceivedTargetPower). In some aspects, the calculation performed by the MT may depend on the RACH target received power after the maximum number of power ramp-up steps. For example, the UE may calculate:

[0090] preambleReceivedTargetPower+(preambleTransMax×powerRampingStep)

[0091] Figure 8 A communication device 800 (eg, a transmitter such as a UE) is shown, which may include devices configured to perform operations for the techniques disclosed herein (eg, Figure 6 800 includes various components (e.g., corresponding to functional module components) for the operations shown. The communication device 800 includes a processing system 802 coupled to a transceiver 808 (e.g., a transmitter and / or a receiver). The transceiver 808 is configured to send and receive signals for the communication device 800 via an antenna 810, such as the various signals described herein. The processing system 802 can be configured to perform processing functions for the communication device 800, including processing signals received or to be transmitted by the communication device 800.

[0092] The processing system 802 includes a processor 804 coupled to a computer readable medium / memory 812 via a bus 806. In some aspects, the computer readable medium / memory 812 is configured to store instructions (e.g., computer executable code) that, when executed by the processor 804, cause the processor 804 to perform Figure 6 The operations shown or other operations for performing various techniques discussed herein. In some aspects, the computer-readable medium / memory 812 stores: code 814 for monitoring SSB transmissions from one or more network entities; and code 816 for selecting a beam or cell associated with one of the one or more network entities based on monitoring and one or more metrics associated with the monitored SSB transmissions, the one or more metrics indicating potential interference caused by uplink transmissions from the first node. In some aspects, the processor 804 has circuits configured to implement the code stored in the computer-readable medium / memory 812. The processor 804 includes: circuits 818 for monitoring SSB transmissions from one or more network entities; and circuits 820 for selecting a beam or cell associated with one of the one or more network entities based on monitoring and one or more metrics associated with the monitored SSB transmissions, the one or more metrics indicating potential interference caused by uplink transmissions from the first node.

[0093] Fig. 9 The diagrams may include a method configured to perform operations for the techniques disclosed herein (e.g., Figure 7900 (e.g., a receiver such as a gNB) includes various components (e.g., corresponding to functional module components) of the operations shown in FIG. 900 . The communication device 900 includes a processing system 902 coupled to a transceiver 908 (e.g., a transmitter and / or a receiver). The transceiver 908 is configured to send and receive signals for the communication device 900 via an antenna 910, such as the various signals described herein. The processing system 902 can be configured to perform processing functions of the communication device 900, including processing signals received and / or to be transmitted by the communication device 900.

[0094] The processing system 902 includes a processor 904 coupled to a computer-readable medium / memory 912 via a bus 906. In some aspects, the computer-readable medium / memory 912 is configured to store instructions (e.g., computer-executable code) that, when executed by the processor 904, cause the processor 904 to perform Figure 7 The operations shown or other operations for performing various techniques discussed herein. In some aspects, the computer-readable medium / memory 912 stores: code 914 for determining a configuration of one or more metrics associated with an SSB transmission monitored by a first node of one or more wireless nodes for selecting a beam or cell, wherein the one or more metrics indicate potential interference caused by uplink transmissions from the first node; and code 916 for sending an indication of the configuration to the first node. In some aspects, the processor 904 has circuits configured to implement the code stored in the computer-readable medium / memory 912. The processor 904 includes: circuits 918 for determining a configuration of one or more metrics associated with an SSB transmission monitored by a first node of one or more wireless nodes for selecting a beam or cell, wherein the one or more metrics indicate potential interference caused by uplink transmissions from the first node; and circuits 920 for sending an indication of the configuration to the first node.

[0095] Example aspects

[0096] Aspect 1: A method for wireless communication performed by a first node of a network, comprising: monitoring synchronization signal block (SSB) transmissions from one or more network entities; and selecting a beam or cell associated with one of the one or more network entities based on the monitoring and one or more metrics associated with the monitored SSB transmissions, the one or more metrics indicating potential interference caused by uplink transmissions from the first node.

[0097] Aspect 2: The method according to aspect 1, wherein the first node comprises a node of an integrated access and backhaul (IAB) network.

[0098] Aspect 3: The method according to aspect 2, wherein the first node uses a shared architecture for both mobile terminal (MT) components and distributed units (DUs).

[0099] Aspect 4: A method according to any one of Aspects 1-3, wherein the selection of the beam or cell is based on an indication of a configuration received from a network entity, and the configuration configures the first node with one or more metrics for selecting the beam or cell based on the monitoring of the SSB transmission.

[0100] Aspect 5: The method according to any one of aspects 1-4, wherein the selecting the beam or cell limits the potential interference caused by the uplink transmission from the first node.

[0101] Aspect 6: A method according to any one of aspects 1-5, wherein the selecting comprises: identifying a suitable cell for selection or reselection based on the one or more metrics.

[0102] Aspect 7: A method according to Aspect 6, wherein the identification is based on the following operations: evaluating a quality metric of a synchronization signal block (SSB) set based on at least one of synchronization signal reference signal received power (SS-RSRP) or SS reference signal received quality (SS-RSRQ); and the first node only considers SSBs for which the associated beam is expected to be used for uplink transmission from the first node without causing excessive interference.

[0103] Aspect 8: The method according to aspect 7, wherein the selecting includes: selecting an SSB and an associated random access channel (RACH) configuration to access a cell detected based on the monitoring.

[0104] Aspect 9: A method according to Aspect 8, wherein if the SSB has a synchronization signal reference signal received power (SS-RSRP) equal to or lower than a second threshold value among the one or more threshold values, the SSB is considered for selection.

[0105] Aspect 10: The method according to Aspect 9, wherein, if no SSB having an SS-RSRP equal to or lower than the second threshold value is detected, the first node selects a detected SSB having a lower SS-RSRP than one or more other detected SSBs.

[0106] Aspect 11: The method according to aspect 10 further comprises: performing a RACH procedure based on the selected SSB and a RACH configuration modified relative to a default RACH configuration.

[0107] Aspect 12: The method according to aspect 11, wherein the modification to the RACH configuration comprises a reduced maximum number of retransmissions.

[0108] Aspect 13: The method according to any one of aspects 9 to 12, wherein if no SSB with SS-RSRP equal to or lower than the second threshold value is detected, avoiding performing a RACH procedure for the detected cell.

[0109] Aspect 14: The method according to any one of aspects 6-13, wherein the one or more metrics include one or more threshold values, and the one or more threshold values ​​include a first threshold value.

[0110] Aspect 15: A method according to Aspect 14, wherein if at least one beam is found based on the monitoring, for which uplink transmission from the first node is expected not to cause excessive interference, the cell is identified as suitable for selection or reselection.

[0111] Aspect 16: A method according to Aspect 15, wherein, if the first node transmits on the at least one beam with the minimum supported transmit power, the at least one beam is found based on whether the estimated uplink received power is equal to or lower than the first threshold value among the one or more threshold values, and for the at least one beam, the uplink transmission from the first node is expected not to cause excessive interference.

[0112] Aspect 17: A method according to any one of Aspects 14-16, wherein the one or more threshold values ​​include at least two threshold values; and the at least two threshold values ​​are different.

[0113] Aspect 18: The method according to Aspect 17, wherein the one or more threshold values ​​are defined by a standard specification; indicated by network signaling; or calculated by the first node.

[0114] Aspect 19: The method according to aspect 18, wherein the one or more threshold values ​​are calculated by the first node based on the RACH configuration of the cell.

[0115] Aspect 20: The method according to aspect 19, wherein one or more threshold values ​​are calculated by the first node based on the RACH target received power and an offset value.

[0116] Aspect 21: The method according to Aspect 20, wherein the offset value is configured to be zero.

[0117] Aspect 22: The method according to aspect 20 or 21, wherein the one or more threshold values ​​are calculated by the first node based on the RACH target received power after a maximum number of power ramp-up steps.

[0118] Aspect 23: The method according to any one of aspects 20-22, wherein the one or more threshold values ​​are calculated by the first node based on the RACH initial target received power.

[0119] Aspect 24: A method for wireless communications performed by a network entity, comprising: determining a configuration of one or more metrics associated with a synchronization signal block (SSB) transmission monitored by a first node among one or more wireless nodes for selecting a beam or cell, wherein the one or more metrics indicate potential interference caused by an uplink transmission from the first node; and sending an indication of the configuration to the first node.

[0120] Aspect 25: The method according to aspect 24, wherein the network entity comprises a network entity of an integrated access and backhaul (IAB) network; and the first node comprises a node of the IAB network.

[0121] Aspect 26: The method according to aspect 24 or 25, wherein the one or more metrics include one or more threshold values.

[0122] Aspect 27: A method according to Aspect 26, wherein the first node is configured to: if the first node transmits on the beam with the minimum supported transmit power, if the estimated uplink received power is equal to or lower than the first threshold value among the one or more threshold values, identify the cell as suitable for selection or reselection.

[0123] Aspect 28: The method according to Aspect 27, wherein the first threshold value comprises a random access channel (RACH) target received power threshold value.

[0124] Aspect 29: An apparatus for wireless communication performed by a first node of a network, comprising: at least one processor; and a memory coupled to the at least one processor, the memory comprising code executable by the at least one processor to cause the apparatus to perform the following operations: monitoring synchronization signal block (SSB) transmissions from one or more network entities; and selecting a beam or cell associated with one of the one or more network entities based on the monitoring and one or more metrics associated with the monitored SSB transmissions, the one or more metrics indicating potential interference caused by uplink transmissions from the first node.

[0125] Aspect 29: An apparatus for wireless communication, comprising: at least one processor; and a memory coupled to the at least one processor, the memory comprising code executable by the at least one processor to cause the apparatus to perform the following operations: determine a configuration of one or more metrics associated with a synchronization signal block (SSB) transmission monitored by a first node among one or more wireless nodes for selecting a beam or cell, wherein the one or more metrics indicate potential interference caused by an uplink transmission from the first node; and send an indication of the configuration to the first node.

[0126] Aspect 31: An apparatus comprising means for performing one or more of the operations described in aspects 1-28.

[0127] Aspect 32: A computer-readable medium having stored thereon code for performing one or more of the operations described in aspects 1-28.

[0128] The techniques described herein can be used for various wireless communication technologies, such as 3GPP Long Term Evolution (LTE), Advanced LTE (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.

[0129] 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 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 named "3rd Generation Partnership Project" (3GPP). cdma2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2).

[0130] The technology described herein can be used for the wireless networks and radio technologies mentioned above as well as other wireless networks and radio technologies. For the sake of clarity, although the terms commonly associated with 3G, 4G and / or 5G wireless technologies may be used herein to describe various aspects, various aspects of the present disclosure may be applied to communication systems based on other generations.

[0131] New Radio (NR) is an emerging wireless communication technology under development in conjunction with the 5G Technology Forum (5GTF). NR access (e.g., 5G NR) can support a variety of wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g., 80MHz or higher), millimeter wave (mmW) targeting high carrier frequency (e.g., 25GHz or higher), large-scale MTC (mMTC) targeting non-backward compatible machine type communication MTC technology, and / or mission critical targeting ultra-reliable low latency communication (URLLC). These services may include latency and reliability requirements. These services may also have different transmission time intervals (TTIs) to meet corresponding quality of service (QoS) requirements. In addition, these services can coexist in the same subframe.

[0132] In 3GPP, the term "cell" may 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) may be used interchangeably. BSs may provide communication coverage for macro cells, pico cells, femto cells and / or other types of cells. Macro cells may cover a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by UEs with service subscriptions. Pico cells may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions. Femto cells may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cells (e.g., UEs in a closed subscriber group (CSG), UEs for users in a residence, etc.). BSs for macro cells may be referred to as macro BSs. BSs for pico cells may be referred to as pico BSs. A BS for a femto cell may be called a femto BS or a home BS.

[0133] UE may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a customer premises equipment (CPE), a cellular phone, a smart phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, an appliance, a medical device or medical apparatus, a biometric sensor / device, a wearable device (such as a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring, a smart bracelet, etc.)), an entertainment device (e.g., a music device, a video device, a satellite wireless unit, etc.), a vehicle-mounted component or sensor, a smart meter / sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium. Some UEs may be considered machine type communication (MTC) devices or evolved MTC (eMTC) devices. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a BS, another device (e.g., a remote device), or some other entity. A wireless node can provide, for example, connectivity to a network (e.g., a wide area network such as the Internet or a cellular network) or to a network via a wired or wireless communication link. Some UEs may be considered Internet of Things (IoT) devices, which may be narrowband IoT (NB-IoT) devices.

[0134] Some wireless networks (e.g., LTE) utilize orthogonal frequency division multiplexing (OFDM) on the downlink and single carrier frequency division multiplexing (SC-FDM) on the uplink. OFDM and SC-FDM divide the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, frequency bins, etc. Each subcarrier can be modulated with data. Typically, modulation symbols are sent in the frequency domain using OFDM and in the time domain using SC-FDM. The spacing between adjacent subcarriers can be fixed, and the total number of subcarriers (K) can depend on the system bandwidth. For example, the spacing of the subcarriers can be 15kHz and the minimum resource allocation (referred to as a "resource block" (RB)) can be 12 subcarriers (or 180kHz). Therefore, for system bandwidths of 1.25, 2.5, 5, 10, or 20 megahertz (MHz), the nominal fast Fourier transform (FFT) size can be equal to 128, 256, 512, 1024, or 2048, respectively. The system bandwidth may also be partitioned into subbands. For example, a subband may cover 1.8 MHz (i.e., 6 RBs), and there may be 1, 2, 4, 8, or 16 subbands for system bandwidths of 1.25, 2.5, 5, 10, or 20 MHz, respectively. In LTE, the basic transmission time interval (TTI) or packet duration is a 1 ms subframe.

[0135] NR can utilize OFDM with CP on both uplink and downlink, and can include support for half-duplex operation using TDD. In NR, the subframe is still 1ms, but the basic TTI is called a time slot. A subframe contains a variable number of time slots (e.g., 1, 2, 4, 8, 16...time slots), depending on the subcarrier spacing. NR RB is 12 continuous frequency subcarriers. NR can support a basic subcarrier spacing of 15KHz, and other subcarrier spacings can be defined relative to the basic subcarrier spacing, such as 30kHz, 60kHz, 120kHz, 240kHz, etc. Symbol and time slot lengths scale with subcarrier spacing. The CP length also depends on the subcarrier spacing. Beamforming can be supported and the beam direction can be dynamically configured. MIMO transmission with precoding can also be supported. In some examples, the MIMO configuration in DL can support up to 8 transmit antennas, with multi-layer DL transmissions of up to 8 streams and up to 2 streams per UE. In some examples, multi-layer transmissions with up to 2 streams per UE can be supported. Aggregation of multiple cells with up to 8 serving cells can be supported.

[0136] In some examples, access to the air interface can be scheduled. The scheduling entity (e.g., BS) allocates resources for communication between some or all devices and apparatuses in its service area or cell. The scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communications, the subordinate entity utilizes the resources allocated by the scheduling entity. The base station is not the only entity that can be used as a scheduling entity. In some examples, the UE may be used as a scheduling entity, and resources for one or more subordinate entities (e.g., one or more other UEs) may be scheduled, and other UEs may utilize the resources scheduled by the UE for wireless communication. In some examples, the UE may be used as a scheduling entity in a peer-to-peer (P2P) network and / or in a mesh network. In the mesh network example, in addition to communicating with the scheduling entity, the UEs may also communicate directly with each other.

[0137] In some examples, two or more slave entities (e.g., UEs) can communicate with each other using sidelink signals. Real-world applications of such sidelink communications may include public safety, short-range services, UE-to-network relaying, vehicle-to-vehicle (V2V) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical mesh networks, and / or various other appropriate applications. Generally, a sidelink signal may refer to a signal transmitted from one slave entity (e.g., UE1) to another slave entity (e.g., UE2) without relaying the communication through a scheduling entity (e.g., UE or BS), even if the scheduling entity may be used for scheduling and / or control purposes. In some examples, sidelink signals may be transmitted using licensed spectrum (unlike wireless local area networks that typically use unlicensed spectrum).

[0138] 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 may 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 may be modified without departing from the scope of the claims.

[0139] As used herein, a phrase referring to "at least one of" a list of items refers to any combination of those items, including single members. For 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 ordering of a, b, and c).

[0140] As used herein, the term "determining" includes a variety of actions. For example, "determining" may include calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, a database, or another data structure), inferring, and the like. Furthermore, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), and the like. Furthermore, "determining" may include resolving, selecting, choosing, establishing, and the like.

[0141] 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 are given the full scope consistent with the text of the claims, wherein, unless specifically stated otherwise, reference to an element in the singular form is not intended to mean "one and only one", but "one or more". Unless otherwise explicitly stated, the term "some" refers to one or more. All structural and functional equivalents of the elements of the various aspects described in this disclosure, which are known or will be known to those skilled in the art, are expressly incorporated herein by reference, and are intended to be included by the claims. In addition, there is no disclosure herein that is intended to be dedicated to the public, regardless of whether such disclosure is explicitly recorded in the claims. No claim element is to be interpreted according to the provisions of 35 U.S.C. § 112 (f), unless the element is explicitly recorded using the phrase "unit for...", or in the case of a method claim, the element is recorded using the phrase "step for...".

[0142] The various operations of the methods described above may be performed by any suitable unit capable of performing the corresponding functions. The unit may include various hardware and / or software components and / or modules, including but not limited to: circuits, application specific integrated circuits (ASICs) or processors. Typically, where there are operations shown in the figure, those operations may have corresponding counterpart functional module components.

[0143] The various illustrative logic blocks, modules, and circuits described in conjunction with the present disclosure may be implemented or performed using a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (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 in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors and a DSP core, or any other such configuration.

[0144] 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. Depending on the specific application and overall design constraints of the processing system, the bus may include any number of interconnecting buses and bridges. The bus may link together various circuits including a processor, a machine-readable medium, and a bus interface. 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 the signal processing functions of the PHY layer. In the user terminal 120 (see Figure 1 ), a user interface (e.g., a keypad, 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 using 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 that how to best implement the functionality described for the processing system depends on the specific application and the overall design constraints imposed on the entire system. For example, in some cases, a processor (such as Figure 2 The processor shown in ) may be configured to perform Figure 6 Operation 600 and / or Figure 7 Operation 700.

[0145] If implemented in software, the functions may be stored on or sent via a computer-readable medium as one or more instructions or codes. Whether referred to as software, firmware, middleware, microcode, hardware description language or other terms, software should be broadly interpreted as meaning instructions, data or any combination thereof. Computer-readable media include both computer storage media and communication media, and communication media include any media that facilitates the transfer of computer programs from one place to another. The processor may be responsible for managing the bus and general processing, which includes 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. In an alternative, a storage medium may be integrated into a processor. For example, a machine-readable medium may include a transmission line, a carrier modulated by data, and / or a computer-readable storage medium having instructions stored thereon that is separated from a wireless node, all of which may be accessed by a processor via a bus interface. Alternatively or in addition, a machine-readable medium or any part thereof may be integrated into a processor, for example, the case may be a cache and / or a general register file. For example, examples of machine-readable storage media may include RAM (random access memory), flash memory, ROM (read-only memory), PROM (programmable read-only memory), EPROM (erasable programmable read-only memory), EEPROM (electrically erasable programmable read-only memory), registers, magnetic disks, optical disks, hard drives, or any other suitable storage media, or any combination thereof. The machine-readable medium may be embodied in a computer program product.

[0146] A software module may include a single instruction or many instructions, and may be distributed over several different code segments, distributed among different programs, and distributed 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 be located in a single storage device or distributed across 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 of the 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. It will be understood that when the functions of a software module are mentioned below, such functions are implemented by the processor when executing instructions from the software module.

[0147] Additionally, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies (such as infrared (IR), radio and microwave), then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies (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 Optical disks, where magnetic disks typically reproduce data magnetically, and optical disks use lasers to reproduce data optically. 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 transient computer-readable media (e.g., signals). Combinations of the above should also be included within the scope of computer-readable media.

[0148] 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 having instructions stored (and / or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein. For example, a computer program product for performing the operations described herein and in Figure 6 and / or Figure 7 The operations shown in the instructions.

[0149] In addition, it should be appreciated that the modules and / or other appropriate units for performing the methods and techniques described herein can be downloaded and / or otherwise obtained by the user terminal and / or base station where applicable. For example, such a device can be coupled to a server to facilitate the transmission of the units for performing the methods described herein. Alternatively, the various methods described herein can be provided via a storage unit (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or a floppy disk, etc.) so that the user terminal and / or base station can obtain the various methods when the storage unit is coupled to or provided to the device. In addition, any other appropriate technology for providing the methods and techniques described herein to the device can be utilized.

[0150] It is to be understood that the claims are not limited to the precise configuration and components shown 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. An apparatus for wireless communication by a first node of a network, include: at least one processor and memory configured to: monitoring synchronization signal block (SSB) transmissions from one or more network entities; as well as Selecting a beam or a cell associated with one of the one or more network entities based on: said monitoring; as well as one or more metrics associated with the monitored SSB transmissions, the one or more metrics indicating potential interference caused by uplink transmissions from the first node, The selection includes: based on whether the estimated uplink received power is equal to or lower than a first threshold value, The beam or cell is selected in which the uplink transmission from the first node at the minimum supported transmit power of the first node does not cause excessive interference, and wherein the excessive interference is defined based on the first threshold value.

2. The device according to claim 1, in, The first node comprises a node of an Integrated Access and Backhaul (IAB) network.

3. The device according to claim 2, in, The first node uses a shared architecture for both mobile terminal (MT) components and distributed units (DU).

4. The device according to claim 1, in, The at least one processor and the memory are configured to select the beam or cell based on an indication of a configuration received from a network entity, the configuration configuring the first node with one or more metrics for selecting the beam or cell based on the monitoring of the SSB transmission.

5. The device according to claim 1, in, The selection of the beam or cell limits the potential interference caused by the uplink transmission from the first node.

6. The device according to claim 1, in, The at least one processor and the memory are configured to select by identifying a suitable cell for selection or reselection based on the one or more metrics, wherein the one or more metrics include one or more threshold values, and the one or more threshold values ​​include the first threshold value.

7. The device according to claim 6, in: The identifying is based on evaluating a quality metric of the SSB set based on at least one of a synchronization signal reference signal received power (SS-RSRP) or a SS reference signal received quality (SS-RSRQ); and The first node only considers SSBs for which use of associated beams for the uplink transmission from the first node is expected not to cause the excessive interference.

8. The device according to claim 6, in, The at least one processor and the memory are configured to select an SSB and an associated random access channel (RACH) configuration to access a cell detected based on the monitoring.

9. The device according to claim 8, in, The at least one processor and the memory are configured to consider the SSB for selection if the SSB has a synchronization signal reference signal received power (SS-RSRP) equal to or lower than a second threshold value among the one or more threshold values.

10. The device according to claim 9, in: The at least one processor and the memory are configured to: if no SSB having an SS-RSRP equal to or lower than the second threshold value is detected, select a detected SSB having a lower SS-RSRP than one or more other detected SSBs; The at least one processor and the memory are further configured to: perform a RACH procedure based on the selected SSB and the modified RACH configuration relative to a default RACH configuration; and The modification to the RACH configuration comprises a reduced maximum number of retransmissions.

11. The device according to claim 9, in, The at least one processor and the memory are configured to avoid performing a RACH procedure for the detected cell if no SSB having an SS-RSRP equal to or lower than the second threshold value is detected.

12. The device according to claim 6, in, The at least one processor and the memory are configured to identify a cell as suitable for selection or reselection if at least one beam is found based on the monitoring for which the uplink transmission from the first node is expected not to cause the excessive interference.

13. The device according to claim 12, in, The at least one processor and the memory are configured to: if the first node transmits on the at least one beam with the minimum supported transmit power, find the at least one beam based on whether the estimated uplink received power is equal to or lower than the first threshold value among the one or more threshold values, for which at least one beam, the uplink transmission from the first node is expected not to cause the excessive interference.

14. The device according to claim 6, in: The one or more threshold values ​​include at least two threshold values; and The at least two threshold values ​​are different.

15. The device according to claim 14, in, The one or more threshold values: Defined by standard specifications; Through network signaling; or Calculated by the first node.

16. The device according to claim 15, in, The one or more threshold values ​​are calculated by the first node based on the RACH configuration of the cell.

17. The device according to claim 16, in, One or more threshold values ​​are calculated by the first node based on the RACH target received power and an offset value.

18. The device according to claim 17, in, The offset value is configured to be zero.

19. The device according to claim 17, in, One or more threshold values ​​are calculated by the first node based on a RACH target received power after a maximum number of power ramp-up steps.

20. The device according to claim 17, in, The one or more threshold values ​​are calculated by the first node based on the RACH initial target received power.

21. An apparatus for wireless communication, include: at least one processor coupled to the memory, configured to: determining a configuration of one or more metrics associated with a synchronization signal block (SSB) transmission monitored by a first node of one or more wireless nodes for selecting a beam or a cell, wherein the one or more metrics indicate potential interference caused by uplink transmissions from the first node, wherein the beam or the cell is selected based on whether an estimated uplink received power is equal to or below a first threshold value, for which the uplink transmission from the first node at a minimum supported transmit power of the first node does not cause excessive interference, and wherein the excessive interference is defined based on the first threshold value; and An indication of the configuration is sent to the first node.

22. The device according to claim 21, in: The apparatus comprises a network entity of an integrated access and backhaul (IAB) network; and The first node comprises a node of the IAB network.

23. The device according to claim 21, in, The one or more metrics include one or more threshold values, and the one or more threshold values ​​include the first threshold value.

24. The device according to claim 23, in, The first node is configured to identify a cell as suitable for selection or reselection if the first node transmits on the beam with the minimum supported transmit power and if an estimated uplink received power is equal to or lower than a first threshold value among the one or more threshold values.

25. The device according to claim 24, in, The first threshold value includes a random access channel (RACH) target receiving power threshold value.

26. A method for wireless communication by a first node of a network, include: monitoring synchronization signal block (SSB) transmissions from one or more network entities; as well as Selecting a beam or a cell associated with one of the one or more network entities based on: said monitoring; as well as one or more metrics associated with the monitored SSB transmissions, the one or more metrics indicating potential interference caused by uplink transmissions from the first node, The selection includes: based on whether the estimated uplink received power is equal to or lower than a first threshold value, selecting the beam or cell in which the uplink transmission from the first node with the minimum supported transmit power of the first node will not cause excessive interference, and wherein the excessive interference is defined based on the first threshold value.

27. The method according to claim 26, in, The one or more metrics include one or more threshold values, and the one or more threshold values ​​include the first threshold value.

28. A method for wireless communication by a network entity, include: determining a configuration of one or more metrics associated with a synchronization signal block (SSB) transmission monitored by a first node of one or more wireless nodes for selecting a beam or a cell, wherein the one or more metrics indicate potential interference caused by uplink transmissions from the first node, wherein the beam or the cell is selected based on whether an estimated uplink received power is equal to or below a first threshold value, for which the uplink transmission from the first node at a minimum supported transmit power of the first node does not cause excessive interference, and wherein the excessive interference is defined based on the first threshold value; and An indication of the configuration is sent to the first node.

29. The method according to claim 28, in: The network entity comprises a network entity of an integrated access and backhaul (IAB) network; and The first node comprises a node of the IAB network.

30. The method according to claim 28, in, The one or more metrics include one or more threshold values, and the one or more threshold values ​​include the first threshold value.

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