Technology for solving IAB node switching time

Abstract

The present disclosure provides a technique for addressing the switching time of an integrated access and backhaul (IAB) child node. For example, a parent IAB node may determine a switching time for a child IAB node to switch from transmitting to the parent node (with transmit power control) on a backhaul / uplink to transmitting to a user equipment (UE) or other child IAB nodes on an access / downlink. The parent IAB node may then configure the IAB child node according to the determined switching time (e.g., by scheduling the IAB child node accordingly or setting one or more timing advance parameters).

Description

[0001] Priority claim

[0002] This application claims priority to U.S. Application No. 17 / 064,592, filed on October 6, 2020, which claims the benefit of priority to U.S. Provisional Application No. 62 / 912,315, filed on October 8, 2019, the entire contents of both applications are expressly incorporated by reference in their entirety as if fully set forth below and for all applicable purposes. Background Art

[0003] Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for addressing integrated access and backhaul (IAB) node switching time.

[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, LTE-Advanced (LTE-A) systems, Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, and Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems, to name a few.

[0005] In some examples, a wireless multiple access communication system may include many base stations (BS), each of which is capable of simultaneously supporting communication with 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 eNodeB (eNB). In other examples (e.g., in a next generation, new radio (NR) or 5G network), a wireless multiple access communication system may include many 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 many 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 NodeB (gNB or gNodeB), a TRP, etc.). A BS or DU may communicate with a collection of UEs on a downlink channel (e.g., for transmission from a BS or DU to a UE) and an uplink channel (e.g., for transmission from a UE to a BS or DU).

[0006] These multiple access technologies have been adopted by 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 promulgated by 3GPP. NR is designed to better support mobile broadband Internet access by improving spectral efficiency, reducing costs, improving services, utilizing new spectrum, and better integrating with other open standards using OFDMA with cyclic prefix (CP) on downlink (DL) and uplink (UL). 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 increase, 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 these technologies. Summary of the invention

[0008] The systems, methods, and devices of the present disclosure each have several aspects, no single one of which is solely responsible for 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 of the Invention," one will understand how the features of the present disclosure provide advantages including improved communication between wireless communication devices.

[0009] Certain aspects provide a method for wireless communication by a first node of an integrated access and backhaul (IAB) network. The method generally includes determining a switching time for a second node of the IAB network to switch between transmitting on an uplink backhaul and transmitting on a downlink access link based on one or more factors, and configuring the second node to operate according to the determined switching time.

[0010] Certain aspects of the present disclosure are directed to an apparatus for wireless communication by a first node of an IAB network. The apparatus generally includes a memory and at least one processor coupled to the memory, the memory and the at least one processor configured to determine a switching time for a second node of the IAB network to switch between transmitting on an uplink backhaul and transmitting on a downlink access link based on one or more factors, and configure the second node to operate according to the determined switching time.

[0011] Certain aspects of the present disclosure are directed to an apparatus for wireless communication by a first node of an IAB network. The apparatus generally includes means for determining a switching time for a second node of the IAB network to switch between transmitting on an uplink backhaul and transmitting on a downlink access link based on one or more factors, and means for configuring the second node to operate according to the determined switching time.

[0012] Certain aspects of the present disclosure are directed to a computer-readable medium having instructions stored thereon for determining a switching time for a second node of an IAB network to switch between transmitting on an uplink backhaul and transmitting on a downlink access link based on one or more factors, and configuring the second node to operate according to the determined switching time.

[0013] Certain aspects provide a method for wireless communication by a second node of an IAB network. The method generally includes providing information about one or more factors to a first node of the IAB network, the one or more factors providing information about a switching time for the second node to switch between transmitting on an uplink backhaul and transmitting on a downlink access link; and receiving signaling from the first node to configure the second node to operate according to the determined switching time.

[0014] Certain aspects of the present disclosure are directed to an apparatus for wireless communication by a second node of an IAB network. The apparatus generally includes a memory and at least one processor coupled to the memory, the memory and the at least one processor being configured to provide information about one or more factors to a first node of the IAB network, the one or more factors providing information about a switching time for the second node to switch between transmitting on an uplink backhaul and transmitting on a downlink access link; and receiving signaling from the first node to configure the second node to operate according to the determined switching time.

[0015] Certain aspects of the present disclosure are directed to an apparatus for wireless communication by a second node of an IAB network. The apparatus generally includes a component for providing information about one or more factors to a first node of the IAB network, the one or more factors providing information about a switching time for the second node to switch between transmitting on an uplink backhaul and transmitting on a downlink access link; and a component for receiving signaling from the first node to configure the second node to operate according to the determined switching time.

[0016] Certain aspects of the present disclosure are directed to a computer-readable medium having instructions stored thereon for providing information about one or more factors to a first node of an IAB network, the one or more factors providing information about a switching time for a second node to switch between transmitting on an uplink backhaul and transmitting on a downlink access link; and receiving signaling from the first node configuring the second node to operate according to the determined switching time.

[0017] To achieve the foregoing and related ends, one or more aspects include 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 represent only a few of the many ways in which the principles of the various aspects may be employed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to be able to understand in detail the manner in which the above-mentioned features of the present disclosure are achieved, a more specific description briefly summarized above may be obtained by referring to some of the aspects shown in the accompanying drawings. 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 admit of 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 a design of an example of a base station (BS) and a user equipment (UE) in accordance with certain aspects of the present disclosure.

[0021] Figure 3 is a diagram illustrating an example of a radio access network according to 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] Figure 5 An example IAB deployment is shown in which aspects of the present disclosure may be practiced.

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

[0025] Figure 7 A flow chart illustrating example operations for wireless communications by a second node of an IAB network in accordance with various aspects of the present disclosure is shown.

[0026] Figure 8 The application of example timing advance parameters according to various aspects of the present disclosure is shown.

[0027] 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

[0028] Aspects of the present disclosure provide techniques for addressing switching times for integrated access and backhaul (IAB) child nodes. For example, a parent IAB node may determine a switching time for a child IAB node to switch from transmitting to the parent node (with transmit power control) on a backhaul / uplink to transmitting to a user equipment (UE) or other child IAB nodes on an access / downlink. The parent IAB node may then configure the IAB child node based on the determined switching time (e.g., by scheduling the IAB child node accordingly or setting one or more timing advance parameters).

[0029] The following description provides examples and does not limit the scope, applicability or examples set forth in the claims. Without departing from the scope of the present disclosure, the functions and arrangements of the elements discussed may be changed. Various examples may omit, replace or add various processes or components according to actual conditions. For example, the described method may be performed in a different order from that described, and various steps may be added, omitted or combined. In addition, the features described in some examples may be combined in some other examples. For example, any number of aspects set forth herein may be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such a device or method, which uses other structures, functions or structures and functions other than the various aspects of the present disclosure set forth herein, or other structures, functions or structures and functions different from the various aspects of the present disclosure set forth herein to practice. It should be understood that any aspect of the present 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 advantageous over other aspects.

[0030] Generally, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific radio access technology (RAT) and can operate on one or more frequencies. RAT can also be referred to as radio technology, air interface, etc. Frequency can also be referred to as carrier, subcarrier, 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.

[0031] Figure 1 An example wireless communication network 100 is shown in which aspects of the present disclosure may be performed. For example, the wireless communication network 100 may be a NR system (e.g., a 5G NR network).

[0032] like Figure 1 As shown in , the wireless communication network 100 may include many base stations (BSs) 110a-z (each base station is also referred to herein individually as BS 110 or collectively as BS 110) and other network entities. BS 110 may provide communication coverage for a specific geographic area (sometimes referred to as a "cell"), which may be fixed or may move according to 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 example shown in , BSs 110a, 110b, and 110c may be macro BSs of macro cells 102a, 102b, and 102c, respectively. BS 110x may be a pico BS of a pico cell 102x. BSs 110y and 110z may be femto BSs of 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 the wireless communication network 100. UEs 120 (e.g., 120x, 120y, etc.) may be dispersed throughout the wireless communication network 100, and each UE 120 may be fixed or mobile.

[0033] The wireless communication network 100 may also include a relay station (e.g., relay station 110r), also known as a relay, etc., which receives transmissions of data and / or other information from an upstream station (e.g., BS 110a or UE 120r) and 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.

[0034] 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.

[0035] Figure 2 It is shown (for example, in Figure 11 and 120 of the wireless communication network 100 of the present invention, which can be used to implement aspects of the present disclosure. For example, the antenna 252, processors 266, 258, 264 and / or controller / processor 280 of the UE 120, and / or the antenna 234, processors 220, 230, 238 and / or controller / processor 240 of the BS 110 can be used to perform the various techniques and methods described herein.

[0036] It should be noted that although Figure 2 UE 120 is shown communicating with BS 110, but child IAB nodes may similarly communicate with a parent IAB node, and each child IAB node may (eg, respectively) have a Figure 2 In other words, the child IAB node may have similar components as the UE 120 and may be configured to perform Figure 7 The parent IAB node may have similar components as the BS 110 and may be configured to perform Figure 6 Operation 600.

[0037] 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 (GCPDCCH), 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 to obtain data symbols and control symbols, respectively. The transmit processor 220 may also generate reference symbols such as for a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a cell-specific reference signal (CRS). If applicable, 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, and may provide an output symbol stream to modulators (MODs) 232a-232t. Each modulator 232 may process a corresponding 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.

[0038] At UE 120, antennas 252a-252r may receive downlink signals from BS 110 or a parent IAB node, or a child IAB node may receive downlink signals from a parent IAB node, and may provide received signals to demodulators (DEMODs) in transceivers 254a-254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a corresponding received signal to obtain input samples. Each demodulator may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all demodulators 254a-254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information to a controller / processor 280.

[0039] On the uplink, at the UE 120 or child IAB node, the transmit processor 264 may receive and process data from the data source 262 (e.g., for a physical uplink shared channel (PUSCH) or PSSCH) and control information from the controller / processor 280 (e.g., for a physical uplink control channel (PUCCH) or PSCCH). The transmit processor 264 may also generate reference symbols for reference signals (e.g., for a sounding reference signal (SRS)). If applicable, the symbols from the transmit processor 264 may be precoded by the TX MIMO processor 266, further processed by the demodulators in the transceivers 254a-254r (e.g., for SC-FDM, etc.), and transmitted to the base station 110 or parent IAB node.

[0040] At BS 110 or a parent IAB node, uplink signals from UE 120 may be received by antenna 234, 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.

[0041] 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.

[0042] Figure 3 is a diagram illustrating an example of a radio access network according to various aspects of the present disclosure.

[0043] As indicated by reference numeral 305, a conventional (e.g., 3G, 4G, LTE) radio access network may include multiple base stations 310 (e.g., access nodes (ANs)), each of which communicates with a core network via a wired backhaul link 315, such as a fiber optic connection. The base stations 310 may communicate with UEs 320 via access links 325, which may be wireless links. In some aspects, Figure 3 The base station 310 shown in FIG. 3 may correspond to Figure 1 Similarly, Figure 3 The UE 320 shown in FIG. 3 may correspond to Figure 1 UE 120 shown in .

[0044] As shown by reference numeral 330, the radio access network may include a wireless backhaul network. In some aspects or scenarios, the wireless backhaul network may sometimes be referred to as an integrated access and backhaul (IAB) network. The IAB network may include multiple base stations, and sometimes the base stations may be of different types or have different operating characteristics. For example, in some aspects, the IAB network may have at least one base station, namely 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 radio network or an IAB network).

[0045] The IAB network may also include one or more non-anchor base stations 345. The non-anchor base stations may be referred to as relay base stations or IAB nodes. The non-anchor base stations 345 may communicate directly with the anchor base station 335 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. 3 may correspond to Figure 1 Similarly, Figure 3 The UE 355 shown in FIG. 3 may correspond to Figure 1 UE 120 shown in .

[0046] As shown by reference numeral 365, in some aspects, a radio 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 (e.g., beamforming, precoding) can be used for communication between base stations or UEs (e.g., between two base stations, between two UEs, or between a base station and a UE). In additional or alternative aspects or examples, a wireless backhaul link 370 between base stations can use millimeter waves to carry information, or can use beamforming, precoding to point to a target base station. Similarly, a wireless access link 375 between a UE and a base station can use millimeter waves, or can point to a target wireless node (e.g., a UE or a base station). In this way, inter-link interference can be reduced.

[0047] 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 for access links and backhaul links, such as time resources, frequency resources, and space resources. In addition, various architectures of IAB nodes or IAB donors may be supported.

[0048] 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 a distributed unit (DU) that schedules and communicates with subnodes of the IAB donor.

[0049] In some aspects, the IAB node may include a mobile terminal component (MT) scheduled by and communicating with the DU of the parent node, and may include a DU that schedules and communicates with the child nodes of the IAB node. The DU of the IAB node may perform the functions described in conjunction with the 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.

[0050] 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 in , the IAB network may include an IAB donor 405, which is connected to the core network via a wired connection (e.g., as a wired optical fiber). For example, the Ng interface of the IAB donor 405 can terminate at the core network. Additionally or alternatively, the IAB donor 405 can 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 described above in conjunction with Figure 3 Anchor base station described. As shown, the IAB donor 405 may include a CU that can 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., MTs or DUs of the IAB nodes 410) connected to the core network via the IAB donor 405. Therefore, the CU of the IAB donor 405 may control or configure the entire IAB network connected to the core network via the IAB donor 405, such as by using a control message or a configuration message (e.g., a radio resource control (RRC) configuration message, an F1 application protocol (F1AP) message).

[0051] 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 by 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).

[0052] 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 the communication of a second node (e.g., when the first node provides a DU function for the MT of the second node), the first node may be referred to as the parent node of the second node, and the second node may be referred to as the child node of the first node. The child node of the second node may be referred to as the grandchild node of the first node. Therefore, the DU of the parent node may control or schedule the communication of 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.

[0053] like Figure 4 As further shown, the link between UE 120 and IAB donor 405, or the link between UE 120 and IAB node 410 may be referred to as access link 415. Each access link 415 may be a wireless access link that provides UE 120 with radio access to a core network via IAB donor 405 and possibly via one or more IAB nodes 410.

[0054] 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 radio access to the core network to the IAB node 410 via the IAB donor 405 and possibly 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, if the primary backhaul link fails, becomes congested, or becomes overloaded, the auxiliary backhaul link may be used. 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.

[0055] As described above, in a typical IAB network, the IAB nodes (e.g., non-anchor base stations) are fixed (i.e., non-mobile). Next generation (5G) wireless networks have the stated goal of providing ultra-high data rates and supporting a wide range of application scenarios. 3GPP has studied the Integrated Access and Backhaul (IAB) system as a possible solution to help support these goals.

[0056] 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 access and backhaul links.

[0057] There are various possible architectures for the IAB node, 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 (e.g., the IAB node), for example, an L2 relay may implement the PHY / MAC / RLC layers.

[0058] Example Techniques for Solving IAB Node Switching Time

[0059] In some scenarios, the switching time at the IAB child node may need to accommodate relatively large swings in transmit power levels. This may occur when switching between transmitting on a backhaul link and transmitting on an access link. For example, the IAB node has the ability to operate access and backhaul in the uplink (UL) or downlink (DL) duplex direction. Transmit power backoff at an IAB node (e.g., an IAB child node) due to UL transmissions with power control and DL transmissions without power control may require the node to switch between two different gain state levels in a relatively short time (e.g., up to 50 dB backoff).

[0060] The large swing in transmit power level may be due to the possibility that the child IAB node may transmit at a relatively low power on the backhaul due to optimal placement of the child node relative to the parent node.

[0061] For example, Figure 5 As shown, the parent node can be placed at a fairly high altitude to cover a given area, and the child node can be placed at a lower location in a direct line of site (LOS) that can result in low path loss. On the other hand, the child node can transmit to the UE on the downlink at close to full power (e.g., if the UE is at the edge of the child node's cell coverage area).

[0062] The potential impact on switching time can be illustrated by considering a scenario in which an IAB child node is scheduled to transmit in the UL backhaul at time slot (or symbol) n and transmit in the access DL at time slot (or symbol) n+1. Given good channel conditions (e.g., from an optimized deployment), the IAB child node can transmit at a relatively low power in time slot (or symbol) n and still meet the target SNR at the parent node receiver. At the same time, the IAB child node may be required to transmit at full power in the subsequent DL time slot (or symbol) n+1 to guarantee signal coverage to distant UEs. As described above, this power gap can be as high as 50 dB, which may mean a relatively large switching time at the IAB child node.

[0063] Currently, the switching time for UE and gNB is specified as a fixed number depending on the frequency range (e.g., FR1 or FR2). To accommodate this switching time, two timing advance parameters for UE transmissions are defined:

[0064] N TA : used to compensate for propagation delay; and

[0065] N TA_offset : Used to accommodate the UL to DL switching time for both gNB and UE.

[0066] When these timing advance parameters are configured, the UE can eventually advance its UL transmission by an amount equal to N TA_offset +N TA The amount of time required for both the UE and the gNB to switch from transmit (Tx) / receive (Rx) mode to Rx / Tx mode before the start of the DL timeslot.

[0067] Between UL and DL time slots In the case of switching, the IAB node can follow this same approach. In this case, the IAB node will have N TA_offset [μs] Switch from Rx state to Tx state (and vice versa).

[0068] However, as described above, a new scenario may arise in IAB where a single node may need to switch from transmissions on one link at one power level (e.g., mobile terminal (MT) Tx in a UL timeslot) to transmissions on another link at a different power level (e.g., to distributed unit (DU) Tx in a DL timeslot). As described above, the corresponding switching time may depend on the power transmitted in the two timeslots and ultimately on the power class (e.g., dynamic range) of the IAB node. In addition, the required switching time may depend on one or more of the following additional factors:

[0069] (1) the actual transmit power (e.g., as opposed to the power class) of the co-located DU (which in turn may depend on the number of RBs that the co-located DU uses to communicate to its children / UEs);

[0070] (2) beams used by a co-located DU to communicate to its children / UEs;

[0071] (3) The required switching time may be small if the communication beam used for transmission between the MT and the parent is adjacent to the communication beam used for transmission from the co-located DU and the grandchild / UE, and vice versa; and

[0072] (4) MT and DU transmission requirements: if the two requirements are different, the baseband filter may need to be reconfigured.

[0073] Some approaches to address the problem of high power switching times include reducing the transmitter dynamic range by increasing the minimum supported power. However, this solution comes at a cost. For example, in the case where a new radio (NR) base station is co-located with an IAB parent node and operates in an adjacent frequency channel, the reduced dynamic range can lead to increased interference and adversely affect throughput performance. Even if the transmission requirements of the IAB child node are relatively strict, performance can still be driven by receiver rejection (e.g., the NR BS adjacent channel specification may not change).

[0074] Therefore, aspects of the present disclosure provide techniques for addressing the switching time at the child IAB node that may cause the large power swings described above.

[0075] Figure 6 6 is a flow diagram illustrating example operations 600 for wireless communication by a first node of an 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 transmission and reception of signals by the first wireless communication device in operation 600 may be performed, for example, via one or more antennas (e.g., Figure 2In some aspects, the transmission and / or reception of signals by the first wireless communication device may be implemented via a bus interface that obtains and / or outputs signals of one or more processors (e.g., controllers / processors 230, 220, 238, 240, and 244).

[0076] Operations 600 may begin at 602 by determining a switching time for a second node of the IAB network to switch between transmitting on an uplink backhaul and transmitting on a downlink access link based on one or more factors. Additionally, at 604, the first node configures the second node to operate according to the determined switching time.

[0077] Figure 7 700 is a flow chart illustrating example operations 700 for wireless communication by a second node of an IAB network in accordance with certain aspects of the present disclosure. Operations 700 may be performed, for example, by a child IAB node. Operations 700 may be implemented as a process on one or more processors (e.g., Figure 2 In addition, the transmission and reception of signals by the first wireless communication device in operation 700 may be performed, for example, via one or more antennas (e.g., Figure 2 In some aspects, the transmission and / or reception of signals by the first wireless communication device may be implemented via a bus interface that obtains and / or outputs signals of one or more processors (e.g., controllers / processors 258, 264, 266, and / or 280).

[0078] Operations 700 begin at 702 by providing information about one or more factors to a first node of an IAB network that provide information about a switching time for a second node to switch between transmitting on an uplink backhaul and transmitting on a downlink access link. At 704, the second node receives signaling from the first node that configures the second node to operate according to the determined switching time.

[0079] Typically, the parent node may determine whether to transmit on the backhaul to transmit on the access link (eg, ) Sub-node IAB switching time transmitted on:

[0080] (1) Power level of IAB node;

[0081] (2) NR frequency range (e.g., FR1 or FR2);

[0082] (3) the actual transmit power of the co-located DU, which in turn may depend on the number of RBs, the channel used (e.g., channel state information (CSI) reference signal (RS), physical downlink control channel (PDCCH), physical downlink shared channel (PDSCH), etc.), and the transmit power offset of the channel relative to a fixed reference point of the co-located DU;

[0083] (4) the beams used by the MT and DU, which in turn may depend on the panels and adjacencies of the beams used by the MT and DU; and / or

[0084] (5) The MT and DU transmission requirements of the baseband filters may need to be reconfigured.

[0085] In some cases, after entering the network, the MT (e.g., a component of a child node) may pass information about one or more of the above factors to the network through a parent node (e.g., through one or more combinations of a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), and / or a physical random access channel (PRACH). In some cases, the parent node or the network may request the UE to pass this information (e.g., through one or more combinations of system information, a medium access control (MAC) control element (CE), a radio resource control (RRC), and / or a PDCCH).

[0086] Based on the above information, the network or parent IAB node can configure the upstream timing of the MT through the timing advance parameter. In some cases, the parent node can schedule the MT to allow sufficient switching time between the DU and the MT.

[0087] In some cases, the MT timing advance may be configured to ensure that the gap between the configured upstream MT Tx and downstream DU Tx may be greater than the IAB switching time between the MT Tx and the DU Tx (e.g., Switching time).

[0088] In some cases, the network and / or the parent node may decide to modify N TA parameters so that it compensates for propagation losses and In this case, the timing offset parameter (e.g., N TA_offset ) may not be changed. In other cases, the network / parent node may decide to modify the timing offset parameters (e.g., N TA_offset ), making it adaptable Switching time. In this case, N TA The parameters may not be changed, but the criteria may need to be changed to take into account the dynamic N TA_offset .

[0089] In some cases, the network and / or parent node may decide to signal the addition of N TA_offset and N TA Additional (eg, new) timing advance parameters (eg, AN TA ), so that the network and / or parent nodes can adapt Switching time. In this case, N TA and N TA_offset None of the parameters can be changed, but additional timing advance parameters (AN TA ).

[0090] In some cases, one or more of the MT timing advance parameters may be configured to optimize resource usage and network throughput (e.g., adjust UL or DL ​​transmission opportunities). For example, a parent node may occasionally decide to signal a timing advance parameter to adapt its switching time, such as in the case of heavy DL load.

[0091] Figure 8 The new timing advance parameter AN is shown. TA Example of MT timing advance. In the example shown, the parent node switches from UL Rx to DL Tx (e.g., as a legacy gNB). The switching time typically needs to be included in the N power level considered. TA_offset However, in this example, the gap is larger than N TA_offset , in order to adapt to the switching time of the sub-node MT Tx to the DU Tx. In other cases, the gap can be larger or smaller than N according to the above factors (e.g., lower level, frequency range, actual transmission power, beam and / or transmission requirements). TA_offset .

[0092] To facilitate understanding, Figure 8 The example shown shows an example where the additional timing advance parameter (AN TA ) is defined so that N TA_offset +N TA +AN TA It is suitable for the case of MT to DU handover at the child node. Although for the sake of illustration, AN TA is represented as a positive quantity, but it can also have negative values. For example, in the case of MT Tx to DU Tx, the switching time of the child node is less than that of the parent node DU Rx to DU / MT Tx.

[0093] As described above, after the child node signals its switching capability, the parent node can calculate AN TA , so that N TA +N TA_offset +AN TA At least equal to the sub-switching time. In this case, based on ANTA The parent node will have a UL-DL difference that is less than or greater than AN TA +N TA_offset switching time.

[0094] The parent switching time is less than AN TA +N TA_offset In the case of , the parent IAB node can use the remaining time to expand its DL opportunity and schedule additional UEs / child nodes. However, in this case, the scheduler can try to ensure that these additional UEs are ready for pre-reception (e.g., by only scheduling UEs that did not transmit in the previous UL opportunity).

[0095] When the parent switching time (e.g., from DU Rx to DU Tx or from DU Rx to MT Tx) is greater than AN TA +N TA_offset (For example, for AN TA When a negative value occurs, the parent node can perform different actions, as described below.

[0096] In some cases, the parent node can TA Set to:

[0097] AN TA =parent switch_time -N TA_offset

[0098] The switching time at the parent node is exactly equal to N TA_offset In the case of TA The value of AN is negative. TA will also be equal to 0. At this point, the parent node can signal the IAB child node to advance its UL transmission by N TA +parent switch_time The child IAB node will have AN after MT to DU handover and before the next DL opportunity starts. TA The absolute value of (for example |AN TA |μs), and can use the remaining time to expand its next DL opportunity and schedule additional UEs / subnodes.

[0099] In some cases, the parent node may signal the IAB child node to increase its UL transmission to AN TA The absolute value of (|AN TA |), while still advancing its timing by N TA +N TA_offset , and the parent node can blank some subsequent DL symbols to adapt its switching time.

[0100] If the IAB parent node switching time is the same as ANTA +N TA_offset If the difference between the subcarrier spacing (SCS) relative to the UE DL BWP (where N is an integer) is greater than N symbols but less than, for example, N+0.5 (or N+0.75 or N+0.875) symbols, the IAB child node may be signaled to expand its UL transmission to |AN TA |(while still advancing its timing by N TA +N TA_offset ). In this case, the parent node can opportunistically increase its DL SCS, thereby shortening the DL symbol duration, in order to accommodate its switching time and avoid blanking longer symbols with a smaller SCS.

[0101] The technology 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.

[0102] 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), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDMA, etc. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). LTE and LTE-A are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization called the Third Generation Partnership Project (3GPP). cdma2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2).

[0103] The techniques described herein can be used for the above wireless networks and radio technologies as well as other wireless networks and radio technologies. For clarity, although 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 other communication systems based on generations.

[0104] New Radio (NR) is an emerging wireless communication technology being developed 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) for wide bandwidth (e.g., 80MHz or higher), millimeter wave (mmW) for high carrier frequencies (e.g., 25GHz or higher), massive machine type communications MTC (mMTC) for non-backward compatible MTC technologies, and / or mission critical ultra-reliable low latency communications (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.

[0105] In 3GPP, the term "cell" can refer to the coverage area of ​​a Node B (NB) and / or a NB subsystem serving the coverage area, depending on the context in which the term is used. In NR systems, the terms "cell" and BS, next-generation NodeB (gNB or gNodeB), access point (AP), distributed unit (DU), carrier or transmit receive point (TRP) can be used interchangeably. The BS can provide communication coverage for macro cells, pico cells, femto cells and / or other types of cells. A macro cell can cover a relatively large geographic area (e.g., a radius of several kilometers) and can allow unrestricted access to UEs with service subscriptions. A pico cell can cover a relatively small geographic area and can allow unrestricted access to UEs with service subscriptions. A femto cell can cover a relatively small geographic area (e.g., a home) and can allow limited access to UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in a home, etc.). A BS for a macro cell can be referred to as a macro BS. A BS for a pico cell can be referred to as a pico BS. A BS for a femto cell can be referred to as a femto BS or a home BS.

[0106] 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 notebook 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 equipment, 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 radio, etc.), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing equipment, 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. that can communicate with a BS, another device (e.g., a remote device), or some other entity. For example, a wireless node can provide connectivity to or to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs can be considered Internet of Things (IoT) devices, which can be narrowband IoT (NB-IoT) devices.

[0107] 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 with OFDM and in the time domain with 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 (called 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 divided into subbands. For example, a subband may cover 1.8 MHz (e.g., 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.

[0108] NR can utilize OFDM with CP on both the uplink and downlink, and includes 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 consecutive 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. The symbol and time slot lengths are proportional to the 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 the DL can support 8 transmit antennas for multi-layer DL transmission with up to 8 streams and up to 2 streams per UE. In some examples, multi-layer transmission with up to 2 streams per UE can be supported. Aggregation of multiple cells up to 8 serving cells can be supported.

[0109] In some examples, access to the air interface can be scheduled. A scheduling entity (e.g., BS) allocates resources for communications between some or all devices and equipment within its service area or cell. A scheduling entity may be responsible for scheduling, allocating, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communications, subordinate entities utilize resources allocated by the scheduling entity. The base station is not the only entity that can act as a scheduling entity. In some examples, a UE may act as a scheduling entity and may schedule resources for one or more subordinate entities (e.g., one or more other UEs), and other UEs may utilize the resources scheduled by the UE for wireless communications. In some examples, a UE may act as a scheduling entity in a peer-to-peer (P2P) network and / or a mesh network. In a mesh network example, in addition to communicating with a scheduling entity, UEs may also communicate directly with each other.

[0110] 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, proximity services, UE-to-network relay, vehicle-to-vehicle (V2V) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical grids, and / or various other suitable applications. Generally, a sidelink signal may refer to a signal that is communicated 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 though the scheduling entity may be used for scheduling and / or control purposes. In some examples, licensed spectrum may be used to communicate sidelink signals (unlike wireless local area networks that typically use unlicensed spectrum).

[0111] Example Embodiments

[0112] Embodiment 1: A method for wireless communication performed by a first node of an integrated access and backhaul (IAB) network, comprising determining a switching time for a second node of the IAB network to switch between transmitting on an uplink backhaul and transmitting on a downlink access link based on one or more factors; and configuring the second node to operate according to the determined switching time.

[0113] Embodiment 2: A method according to embodiment 1, wherein one or more factors include a power level of the second node; a frequency range in which the second node is operating; an actual transmission power used for transmission on a downlink access link; or one or more beams used for transmission on an uplink backhaul and on a downlink access link.

[0114] Embodiment 3: The method according to embodiment 2 further includes receiving signaling indicating information about one or more factors from the second node.

[0115] Embodiment 4: The method according to embodiment 2 or 3 further includes: sending a request for the second node to provide information about the factor; and receiving signaling of the information in response to the request from the second node.

[0116] Embodiment 5: The method according to embodiment 4, wherein the request is sent via at least one of the following: system information (SI), medium access control (MAC) control element (CE), radio resource control (RRC) or physical downlink control channel (PDCCH).

[0117] Embodiment 6: The method according to any one of embodiments 1-5, wherein configuring the second node includes scheduling the second node for transmission on the uplink backhaul to adapt to the determined switching time.

[0118] Embodiment 7: A method according to any one of embodiments 1-6, wherein configuring the second node comprises: setting one or more timing advance parameters based on the determined switching time; and signaling the timing advance parameters to the second node.

[0119] Embodiment 8: The method according to embodiment 7, wherein setting one or more timing advance parameters includes modifying the timing advance parameters without adjusting the timing advance offset parameters.

[0120] Embodiment 9: The method according to embodiment 7 or 8, wherein setting one or more timing advance parameters includes modifying a timing advance offset parameter without adjusting the timing advance parameter.

[0121] Embodiment 10: A method according to any one of embodiments 7-9, wherein the one or more parameters include a first timing advance parameter, a timing advance offset parameter, and a second timing advance parameter.

[0122] Embodiment 11: The method according to embodiment 10, wherein the second timing advance parameter can indicate a positive timing advance value or a negative timing advance value.

[0123] Embodiment 12: The method according to embodiment 10 or 11, wherein the second timing advance parameter is calculated so that the sum of the first timing advance parameter, the timing advance offset parameter and the second timing advance parameter is at least equal to the determined switching time.

[0124] Embodiment 13: The method according to embodiment 12 further includes: if the switching time at the first node is less than the sum of the timing advance offset parameter and the second timing advance parameter, using the time difference to increase the downlink opportunity.

[0125] Embodiment 14: The method according to embodiment 13 further includes using the increased downlink opportunities to schedule additional one or more other nodes or user equipments (UEs).

[0126] Embodiment 15: The method according to any one of Embodiments 12-14 further includes: if the switching time at the first node is greater than the sum of the timing advance offset parameter and the second timing advance parameter, adjusting the second timing advance parameter so that the switching time of the first node is not less than the sum of the timing advance offset parameter and the second timing advance parameter; the first node signals the second node to increase its uplink return transmission time and blank some downlink symbols; or the first node signals the second node to increase its uplink return transmission time and increase the downlink subcarrier spacing (SCS).

[0127] Embodiment 16: A method according to any one of embodiments 7-15, wherein one or more timing advance parameters are further set to optimize at least one of resource utilization or network throughput.

[0128] Embodiment 17: A method for wireless communication performed by a second node of an IAB network, comprising: providing information about one or more factors to a first node of the IAB network, the one or more factors providing information about a switching time for the second node to switch between transmitting on an uplink backhaul and transmitting on a downlink access link; and receiving signaling from the first node configuring the second node to operate according to the switching time.

[0129] Embodiment 18: A method according to embodiment 17, wherein one or more factors include a power level of the second node; a frequency range in which the second node is operating; an actual transmission power used for transmission on a downlink access link; or one or more beams used for transmission on an uplink backhaul and on a downlink access link.

[0130] Embodiment 19: The method according to embodiment 17 or 18, wherein the information is provided upon entering the IAB network.

[0131] Embodiment 20: The method according to any one of embodiments 17-19 further includes receiving a request for providing information from the first node; and providing the information in response to the request.

[0132] Embodiment 21: The method according to embodiment 20, wherein the request is received via at least one of the following: SI, MAC-CE, RRC or PDCCH.

[0133] Embodiment 22: A method according to any one of embodiments 17-21, wherein the signaling from the first node includes signaling of one or more timing advance parameters.

[0134] Embodiment 23: The method according to embodiment 22, wherein the one or more timing advance parameters include a first timing advance parameter, a timing advance offset parameter and a second timing advance parameter.

[0135] Embodiment 24: The method according to embodiment 23, wherein the second timing advance parameter can indicate a positive timing advance value or a negative timing advance value.

[0136] Embodiment 25: The method according to embodiment 24 further includes increasing uplink transmission opportunities or downlink transmission opportunities based on the second timing advance parameter.

[0137] Embodiment 26: The method according to any one of embodiments 22-25 further includes receiving signaling for increasing uplink transmission opportunities from the first node.

[0138] Embodiment 27: An apparatus for wireless communication performed by a first node of an IAB network, comprising a component for determining a switching time for a second node of the IAB network to switch between transmitting on an uplink backhaul and transmitting on a downlink access link based on one or more factors; and a component for configuring the second node to operate according to the determined switching time.

[0139] Embodiment 28: An apparatus according to embodiment 27, wherein one or more factors include a power level of the second node; a frequency range in which the second node is operating; an actual transmission power used for transmission on a downlink access link; or one or more beams used for transmission on an uplink backhaul and on a downlink access link.

[0140] Embodiment 29: An apparatus for wireless communication performed by a second node of an IAB network, comprising: a component for providing information about one or more factors to a first node of the IAB network, the one or more factors providing information about a switching time for the second node to switch between transmitting on an uplink backhaul and transmitting on a downlink access link; and a component for receiving signaling from the first node configuring the second node to operate according to the switching time.

[0141] Embodiment 30: An apparatus according to embodiment 29, wherein one or more factors include a power level of the second node; a frequency range in which the second node is operating; an actual transmission power used for transmission on a downlink access link; or one or more beams used for transmission on an uplink backhaul and on a downlink access link.

[0142] Embodiment 31: An apparatus for wireless communication performed by a first node of an IAB network, comprising at least one processor and a memory, wherein the at least one processor and the memory are configured to determine a switching time for a second node of the IAB network to switch between transmitting on an uplink backhaul and transmitting on a downlink access link based on one or more factors; and configure the second node to operate according to the determined switching time.

[0143] Embodiment 32: An apparatus for wireless communication performed by a second node of an IAB network, comprising at least one processor and a memory, the at least one processor and the memory being configured to provide information about one or more factors to a first node of the IAB network, the one or more factors providing information about a switching time for the second node to switch between transmitting on an uplink backhaul and transmitting on a downlink access link; and receiving signaling from the first node configuring the second node to operate according to the switching time.

[0144] Embodiment 33: A computer-readable medium having instructions stored thereon for determining a switching time for a second node of an IAB network to switch between transmitting on an uplink backhaul and transmitting on a downlink access link based on one or more factors, and configuring the second node to operate according to the determined switching time.

[0145] Embodiment 34: A computer-readable medium having instructions stored thereon for providing information about one or more factors to a first node of an IAB network, the one or more factors providing information about a switching time for a second node to switch between transmitting on an uplink backhaul and transmitting on a downlink access link; and receiving signaling from the first node configuring the second node to operate according to the switching time.

[0146] The methods disclosed herein include one or more steps or actions for implementing these methods. Without departing from the scope of the claims, the method steps and / or actions can be interchangeable with each other. In other words, unless the specific order of the steps or actions is specified, the order and / or use of the specific steps and / or actions can be modified without departing from the scope of the claims.

[0147] 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. As an example, "at least one of a, b, or c" is intended to cover a, b, c, ab, ac, bc, and abc, as well as any combination with multiple of the same elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc or any other order of a, b, and c).

[0148] As used herein, the term "determine" covers a wide variety of actions. For example, "determine" may include calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, a database, or another data structure), ascertaining, etc. In addition, "determine" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), etc. In addition, "determine" may include solving, selecting, choosing, establishing, etc.

[0149] 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 will be given the full scope consistent with the language of the claims, wherein, unless otherwise specified, the elements mentioned in the singular are 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 throughout this disclosure that are known or will be known to a person of ordinary skill in the art are expressly incorporated herein by reference and are intended to be covered by the claims. In addition, nothing disclosed herein is intended to be dedicated to the public, regardless of whether such disclosure is explicitly stated in the claims. Unless the element is explicitly stated using the phrase "parts for...", or in the case of a method claim, the element is stated using the phrase "step for...", otherwise the elements of the claim are not interpreted according to the provisions of 35 U.S.C. §112 (f).

[0150] The various operations of the above method can be performed by any suitable components capable of performing the corresponding functions. The components 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, these operations may have corresponding components plus functions.

[0151] The various illustrative logical blocks, modules, and circuits described in conjunction with the present disclosure may be implemented or performed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic device (PLD) designed to perform the functions described herein, discrete gate or transistor logic, discrete hardware components, or any combination thereof. 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, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0152] 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. Among other things, the bus interface may be used to connect a network adapter 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., keyboard, display, mouse, joystick, etc.) may also be connected to the bus. The bus may also link various other circuits that are well known in the art and therefore will not be described further, such as timing sources, peripherals, voltage regulators, power management circuits, etc. The processor may be implemented with one or more general and / or special purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuits that can execute software. Those skilled in the art will recognize how best to implement the functionality described for the processing system based on the specific application and the overall design constraints imposed on the entire system. For example, in some cases, such as Figure 2 The processors shown in FIG. 1 may be configured to perform Figure 6 Operation 600 and / or Figure 7 Operation 700.

[0153] If implemented in software, these functions can be stored or transmitted as one or more instructions or codes on a computer-readable medium. Whether the software is called software, firmware, middleware, microcode, hardware description language or other, it 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 can be responsible for managing the bus and general processing including executing software modules stored on the machine-readable storage medium. The computer-readable storage medium can be coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. In an alternative, the storage medium can be integrated into the processor. For example, the machine-readable medium can include a transmission line, a carrier modulated by data, and / or a computer-readable storage medium on which instructions separated from the wireless node are stored, all of which can be accessed by the processor through a bus interface. Alternatively or in addition, the machine-readable medium or any part thereof can be integrated into the processor, such as this case can be related to a cache and / or a general register file. Examples of machine-readable storage media may include, for example, RAM (random access memory), flash memory, ROM (read only memory), PROM (programmable read only memory), EPROM (erasable programmable read only memory), EEPROM (electrically erasable programmable read only memory), registers, magnetic disks, optical disks, hard drives, or any other suitable storage media, or any combination thereof. Machine-readable media may be embodied in a computer program product.

[0154] A software module may include a single instruction or many instructions, and may be distributed among different programs and across several different code segments of multiple storage media. A computer-readable medium may include multiple software modules. A software module includes instructions that, when executed by a device such as a processor, cause a processing system to perform various functions. A software module may include a sending module and a receiving module. Each software module may reside in a single storage device or be distributed in multiple storage devices. For example, when a triggering event occurs, a software module may be loaded from a hard drive into a RAM. During the execution of a software module, a processor may load some instructions into a cache to increase access speed. One or more cache lines may then be loaded into a general register file for execution by the processor. When the function of a software module is mentioned below, it should be understood that such function is implemented by the processor when executing instructions from the software module.

[0155] Furthermore, 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 microwaves, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared (IR), radio, and microwaves are included in the definition of medium. As used herein, disk and disc include compact disk (CD), laser disk, optical disk, digital versatile disk (DVD), floppy disk, and Disks, where disks typically reproduce data magnetically, while discs reproduce data optically using lasers. Thus, in some aspects, computer readable media may include non-transitory computer readable media (e.g., tangible media). Additionally, for other aspects, computer readable media may include transitory computer readable media (e.g., signals). Combinations of the above should also be included within the scope of computer readable media.

[0156] 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, for performing the operations described herein and Figure 6-7 The operations shown in the instructions.

[0157] In addition, it should be understood that the modules and / or other appropriate components for executing the methods and techniques described herein can be downloaded and / or otherwise obtained by the user terminal and / or base station when applicable. For example, such a device can be coupled to a server to facilitate the transfer of components for executing the methods described herein. Alternatively, the various methods described herein can be provided via a storage component (e.g., RAM, ROM, a physical storage medium such as a compact disk (CD) or a floppy disk), so that the user terminal and / or base station can obtain various methods when the storage component is coupled or provided to the device. In addition, any other suitable technology for providing the methods and techniques described herein to the device can be used.

[0158] It is to be understood that the claims are not limited to the precise configuration and components illustrated above. Various modifications, changes and variations may be made in the arrangement, operation and details of the methods and apparatus described above without departing from the scope of the claims.

Claims

1. An apparatus for wireless communication by a first node of an integrated access and backhaul (IAB) network, include: at least one processor and a memory coupled to the at least one processor, the at least one processor and the memory being configured to: receiving, from a second node of the IAB network, information regarding one or more factors providing information regarding a switching time for the second node to switch between transmitting on an uplink backhaul and transmitting on a downlink access link; determining, based on the one or more factors, a switching time for a second node of the IAB network to switch between transmitting on the uplink backhaul and transmitting on the downlink access link; as well as The second node is configured to operate according to the determined switching time.

2. The device according to claim 1, in, The one or more factors include: a power level of the second node; a frequency range in which the second node is operating; an actual transmit power used for transmission on the downlink access link; or One or more beams for transmission on the uplink backhaul and for transmission on the downlink access link.

3. The device according to claim 2, in, The at least one processor and memory are further configured to receive signaling from the second node indicating information regarding the one or more of the factors.

4. The device according to claim 2, in, The at least one processor and memory are further configured to: sending a request for the second node to provide information about the one or more factors; and Signaling of the information in response to the request is received from the second node.

5. The device according to claim 4, in, The request is sent via at least one of: system information SI, medium access control MAC control element CE, radio resource control RRC or physical downlink control channel PDCCH.

6. The device according to claim 1, in, Configuring the second node includes: The second node is scheduled for transmission on the uplink backhaul to accommodate the determined switching time.

7. The device according to claim 1, in, Configuring the second node includes: setting one or more timing advance parameters based on the determined switching time; and The one or more timing advance parameters are signaled to the second node.

8. The device according to claim 7, in, Setting the one or more timing advance parameters includes modifying a timing advance parameter without adjusting a timing advance offset parameter.

9. The device according to claim 7, in, Setting the one or more timing advance parameters includes modifying a timing advance offset parameter without adjusting a timing advance parameter.

10. The device according to claim 7, in, The one or more timing advance parameters include a first timing advance parameter, a timing advance offset parameter, and a second timing advance parameter.

11. The device according to claim 10, in, The second timing advance parameter can indicate a positive timing advance value or a negative timing advance value.

12. The device according to claim 10, in, The second timing advance parameter is calculated such that a sum of the first timing advance parameter, the timing advance offset parameter and the second timing advance parameter is at least equal to the determined switching time.

13. The device according to claim 12, in, The at least one processor and memory are further configured to use the time difference to increase a downlink opportunity if a switching time at the first node is less than a sum of the timing advance offset parameter and the second timing advance parameter.

14. The device according to claim 13, in, The at least one processor and memory are further configured to schedule additional one or more other nodes or user equipments UE using the increased downlink opportunities.

15. The device according to claim 12, in, The at least one processor and memory are further configured to, if a switching time at the first node is greater than a sum of the timing advance offset parameter and the second timing advance parameter: adjusting the second timing advance parameter so that the first node switching time is not less than the sum of the timing advance offset parameter and the second timing advance parameter; signaling, by the first node, to the second node to increase its uplink backhaul transmission time and to blank some downlink symbols; or The first node signals the second node to increase its uplink backhaul transmission time and to increase the downlink subcarrier spacing SCS.

16. The device according to claim 7, in, The one or more timing advance parameters are also set to optimize at least one of resource usage or network throughput.

17. An apparatus for wireless communication by a second node of an integrated access and backhaul (IAB) network, include: at least one processor and a memory coupled to the at least one processor, the at least one processor and the memory being configured to: providing, to a first node of the IAB network, information regarding one or more factors providing information regarding a switching time for the second node to switch between transmitting on an uplink backhaul and transmitting on a downlink access link; as well as Signaling is received from the first node configuring the second node to operate according to the switching time.

18. The device according to claim 17, in, The switching time depends on the one or more factors.

19. The device according to claim 17, in, The one or more factors include: a power level of the second node; a frequency range in which the second node is operating; an actual transmission power used for transmission on the downlink access link; or one or more beams used for transmission on the uplink backhaul and transmission on the downlink access link.

20. The device according to claim 17, in, The information is provided upon entering the IAB network.

21. The device according to claim 17, further comprising: include: receiving, from the first node, a request to provide the information; as well as The information is provided in response to the request.

22. The device according to claim 21, in, The request is received via at least one of: system information SI, a medium access control MAC control element CE, a radio resource control RRC or a physical downlink control channel PDCCH.

23. The device according to claim 17, in, The signaling from the first node includes: Signaling of one or more timing advance parameters.

24. The device according to claim 23, in, The one or more timing advance parameters include a first timing advance parameter, a timing advance offset parameter, and a second timing advance parameter.

25. The device according to claim 24, in, The second timing advance parameter can indicate a positive timing advance value or a negative timing advance value.

26. The device according to claim 25, in, The at least one processor and memory are further configured to increase an uplink transmission opportunity or a downlink transmission opportunity based on the second timing advance parameter.

27. The device according to claim 23, in, The at least one processor and memory are further configured to receive signaling from the first node to increase an uplink transmission opportunity.

28. A method for wireless communication by a first node of an integrated access and backhaul (IAB) network, include: receiving, from a second node of the IAB network, information regarding one or more factors providing information regarding a switching time for the second node to switch between transmitting on an uplink backhaul and transmitting on a downlink access link; determining, based on the one or more factors, a switching time for a second node of the IAB network to switch between transmitting on the uplink backhaul and transmitting on the downlink access link; as well as The second node is configured to operate according to the determined switching time.

29. The method according to claim 28, in, The one or more factors include: a power level of the second node; a frequency range in which the second node is operating; an actual transmit power used for transmission on the downlink access link; or One or more beams for transmission on the uplink backhaul and for transmission on the downlink access link.

30. A method for wireless communication by a second node of an integrated access and backhaul (IAB) network, include: providing, to a first node of the IAB network, information regarding one or more factors providing information regarding a switching time for the second node to switch between transmitting on an uplink backhaul and transmitting on a downlink access link; as well as Signaling is received from the first node configuring the second node to operate according to the switching time.

31. A computer readable medium having stored thereon instructions, in, The instructions are executable by one or more processors of a network node to cause the processors to perform a method according to any one of claims 28-29.

32. A computer readable medium having stored thereon instructions, in, The instructions are executable by one or more processors of a network node to cause the processors to perform the method according to claim 30.

33. A computer program product comprising a computer readable medium having instructions stored thereon, in, The instructions are executable by one or more processors of a network node to cause the processors to perform a method according to any one of claims 28-29.

34. A computer-readable medium comprising a computer-readable medium having instructions stored thereon, in, The instructions are executable by one or more processors of a network node to cause the processors to perform the method according to claim 30.

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