Methods and apparatus for reducing cross-link interference in mobile communications
By measuring and reporting PMI/RI information and employing modulation coordination, CLI in wireless networks is mitigated, improving communication quality and efficiency across diverse mobile communication systems.
Patent Information
- Application Number
- PCT/CN2024/091759
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-01-11
- Filing Date
- 2024-05-08
- Publication Date
- 2025-07-17
AI Technical Summary
Cross-link interference (CLI) in wireless communication environments, particularly between user equipment (UE) and network nodes, leads to significant interference in sub-band full-duplex (SBFD) capable communication systems, affecting both uplink and downlink transmissions.
Implementing methods for user equipment to measure and report precoding matrix indicator (PMI) or rank indicator (RI) information to network nodes, using codebook-based or codebook-less approaches, to recommend or restrict precoding strategies that minimize CLI, along with modulation information sharing and coordination techniques to optimize communication.
Reduces cross-link interference by optimizing precoding and modulation strategies, enhancing communication quality and efficiency in wireless networks, applicable to various radio access technologies including 5G, LTE, and future networks.
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Figure CN2024091759_17072025_PF_FP_ABST
Abstract
Description
METHODS AND APPARATUS FOR REDUCING CROSS-LINK INTERFERENCE IN MOBILE COMMUNICATIONS
[0001] CROSS REFERENCE TO RELATED PATENT APPLICATION (S)
[0002] The present disclosure is part of a non-provisional application claiming the priority benefit of U.S. Patent Application No. 63 / 619,752, filed 11 January 2024, the content of which herein being incorporated by reference in its entirety.TECHNICAL FIELD
[0003] The present disclosure is generally related to mobile communications and, more particularly, to cross-link interference (CLI) improvement with respect to user equipment (UE) and network apparatus in mobile communications.BACKGROUND
[0004] Unless otherwise indicated herein, approaches described in this section are not prior art to the claims listed below and are not admitted as prior art by inclusion in this section.
[0005] In wireless communication environments, wireless signals transmitted or broadcast by network nodes or apparatuses in a wireless network may cause cross-link-interference (CLI) to neighboring network nodes or apparatuses in the neighboring areas. In addition, for a sub-band full-duplex (SBFD) capable communication apparatus (e.g., a user equipment (UE) ) , the leakage of uplink (UL) transmission may contaminate downlink (DL) reception and become an interference to communication apparatus. Therefore, CLI improvement is an important operation to a communication apparatus in the wireless network.
[0006] Accordingly, how to reduce CLI in the wireless communication environments becomes an important issue for the newly developed wireless communication network.SUMMARY
[0007] The following summary is illustrative only and is not intended to be limiting in any way. That is, the following summary is provided to introduce concepts, highlights, benefits and advantages of the novel and non-obvious techniques described herein. Select implementations are further described below in the detailed description. Thus, the following summary is not intended to identify essential features of the claimed subject matter, nor is it intended for use in determining the scope of the claimed subject matter.
[0008] One objective of the present disclosure is to propose schemes, concepts, designs, systems, methods and apparatus pertaining to reduce cross-link interference (CLI) with respect to user equipment and network apparatus in mobile communications. It is believed that the above-described issue would be avoided or otherwise alleviated by implementing one or more of the proposed schemes described herein.
[0009] In one aspect, a method may involve an apparatus measuring a signal from an aggressor user equipment (UE) to determine precoding matrix indicator (PMI) information or rank indicator (RI) information associated with CLI from the aggressor UE. The method may also involve the apparatus transmitting a measurement report with the PMI information or the RI information to a network node.
[0010] In another aspect, a method may involve an apparatus receiving a request from a network node for triggering a CLI estimation. The method may also involve the apparatus performing a measurement to estimate a spatial transmit covariance matrix of the apparatus to a victim UE. The method may also involve the apparatus determining at least one recommended or restricted PMI according to the measurement. The method may further involve the apparatus transmitting the at least one recommended or restricted PMI to the network node.
[0011] In another aspect, a method may involve an apparatus obtaining modulation information associated with an aggressor UE from a network node or through a blind detection. The method may also involve the apparatus measuring a reference signal of the aggressor UE according to the modulation information. The method may further involve the apparatus performing a CLI strategy according to the reference signal and the modulation information associated with the aggressor UE, or according to a command from the network node.
[0012] In another aspect, a method may involve a first network node obtaining sharing information from a second network node. The method may also involve the first network node determining a modulation configuration for at least one UE communicating with the first network node according to the sharing information. The method may further involve the first network node transmitting the modulation configuration to the at least one UE.
[0013] It is noteworthy that, although description provided herein may be in the context of certain radio access technologies, networks and network topologies such as 5th Generation System (5GS) and 4G EPS mobile networking, the proposed concepts, schemes and any variation (s) / derivative (s) thereof may be implemented in, for and by other types of wireless and wired communication technologies, networks and network topologies such as, for example and without limitation, Ethernet, Universal Terrestrial Radio Access Network (UTRAN) , E-UTRAN, Global System for Mobile communications (GSM) , General Packet Radio Service (GPRS) / Enhanced Data rates for Global Evolution (EDGE) Radio Access Network (GERAN) , Long-Term Evolution (LTE) , LTE-Advanced, LTE-Advanced Pro, IoT, Industrial IoT (IIoT) , Narrow Band Internet of Things (NB-IoT) , 6th Generation (6G) , and any future-developed networking technologies. Thus, the scope of the present disclosure is not limited to the examples described herein.BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The accompanying drawings are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of the present disclosure. The drawings illustrate implementations of the disclosure and, together with the description, serve to explain the principles of the disclosure. It is appreciable that the drawings are not necessarily in scale as some components may be shown to be out of proportion than the size in actual implementation in order to clearly illustrate the concept of the present disclosure.
[0015] FIG. 1 is a diagram depicting an example scenario of a wireless communication environment having two types of interference in accordance with the present disclosure may be implemented.
[0016] FIG. 2 is a diagram depicting an example scenario for a PMI or RI information reporting procedure in accordance with implementations of the present disclosure.
[0017] FIG. 3 is a diagram depicting an example scenario for a codebook-based recommended PMI reporting under the first proposed scheme in accordance with implementations of the present disclosure.
[0018] FIG. 4 is a diagram depicting an example scenario for a codebook-less recommended PMI reporting under the second proposed scheme in accordance with implementations of the present disclosure.
[0019] FIG. 5 is a diagram depicting an example scenario for a codebook-based recommended PMI reporting under the third proposed scheme in accordance with implementations of the present disclosure.
[0020] FIG. 6 is a diagram depicting an example scenario for a codebook-less recommended PMI reporting under the fourth proposed scheme in accordance with implementations of the present disclosure.
[0021] FIG. 7 is a diagram depicting an example scenario for a differential PMI for the recommended PMI reporting under the fifth proposed scheme in accordance with implementations of the present disclosure.
[0022] FIG. 8 is a diagram depicting an example scenario for a codebook-based restricted PMI reporting under the first proposed scheme in accordance with implementations of the present disclosure.
[0023] FIG. 9 is a diagram depicting an example scenario for a codebook-less restricted PMI reporting under the second proposed scheme in accordance with implementations of the present disclosure.
[0024] FIG. 10 is a diagram depicting an example scenario for a codebook-based restricted PMI reporting under the third proposed scheme in accordance with implementations of the present disclosure.
[0025] FIG. 11 is a diagram depicting an example scenario for a codebook-less restricted PMI reporting under the fourth proposed scheme in accordance with implementations of the present disclosure.
[0026] FIG. 12 is a diagram depicting an example scenario for a friendly PMI reporting procedure in accordance with implementations of the present disclosure.
[0027] FIG. 13 is a diagram depicting an example scenario for a soft coordination procedure in accordance with implementations of the present disclosure.
[0028] FIG. 14 is a diagram depicting another example scenario for a soft coordination procedure in accordance with implementations of the present disclosure.
[0029] FIG. 15 is a diagram depicting another example scenario for a soft coordination procedure in accordance with implementations of the present disclosure.
[0030] FIG. 16 is a diagram depicting another example scenario for a soft coordination procedure in accordance with implementations of the present disclosure.
[0031] FIG. 17 is a diagram depicting another example scenario for a soft coordination procedure in accordance with implementations of the present disclosure.
[0032] FIG. 18 is a diagram depicting an example scenario for an enhanced coordination procedure in accordance with implementations of the present disclosure.
[0033] FIG. 19 is a diagram depicting another example scenario for an enhanced coordination procedure in accordance with implementations of the present disclosure.
[0034] FIG. 20 is a diagram depicting an example scenario for a CLI strategy selection in an enhanced coordination procedure in accordance with implementations of the present disclosure.
[0035] FIG. 21 is a diagram depicting another example scenario for a CLI strategy selection in an enhanced coordination procedure in accordance with implementations of the present disclosure.
[0036] FIG. 22 is a block diagram of an example communication system in accordance with an implementation of the present disclosure.
[0037] FIG. 23 is a flowchart of an example process in accordance with an implementation of the present disclosure.
[0038] FIG. 24 is a flowchart of an example process in accordance with another implementation of the present disclosure.
[0039] FIG. 25 is a flowchart of an example process in accordance with another implementation of the present disclosure.
[0040] FIG. 26 is a flowchart of an example process in accordance with another implementation of the present disclosure.
[0041] DETAILED DESCRIPTION OF PREFERRED IMPLEMENTATIONS
[0042] Detailed embodiments and implementations of the claimed subject matters are disclosed herein. However, it shall be understood that the disclosed embodiments and implementations are merely illustrative of the claimed subject matters which may be embodied in various forms. The present disclosure may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments and implementations set forth herein. Rather, these exemplary embodiments and implementations are provided so that description of the present disclosure is thorough and complete and will fully convey the scope of the present disclosure to those skilled in the art. In the description below, details of well-known features and techniques may be omitted to avoid unnecessarily obscuring the presented embodiments and implementations.
[0043] Overview
[0044] Implementations in accordance with the present disclosure relate to various techniques, methods, schemes and / or solutions pertaining to reducing cross-link interference (CLI) with respect to user equipment and network apparatus in mobile communications. According to the present disclosure, a number of possible solutions may be implemented separately or jointly. That is, although these possible solutions may be described below separately, two or more of these possible solutions may be implemented in one combination or another.
[0045] FIG. 1 illustrates an example scenario 100 of a wireless communication environment having two types of interference in accordance with implementations of the present disclosure. The wireless communication environment may comprise at least two gNBs 110 and 120 (i.e., network nodes) and at least three UEs 130, 140 and 150. The gNB 110 may transmit downlink (DL) signals to the UE 140 and the UE 130 may transmit uplink (UL) signals to the gNB 110. The UE 150 may transmit UL signals to the gNB 120.
[0046] When the transmission (Tx) and reception (Rx) operations between gNBs are performed concurrently or substantially concurrently, or are partially or fully overlapped in time, the gNB-to-gNB DL-UL interference (which is one type of CLI interference) may occur. For example, the DL signals from the gNB 110 may interfere the UL signals from the UE 150. Similarly, when the Tx and Rx operations between UEs are performed concurrently or substantially concurrently, or are partially or fully overlapped in time, the UE-to-UE UL-DL interference (which is another type of CLI interference) may occur. In an example, the UL signals from the UE 130 may interfere the DL signals from the gNB 110, i.e., intra-cell inter-UE CLI. In another example, the UL signals from the UE 150 may interfere the DL signals from the gNB 110, i.e., inter-cell inter-UE CLI.
[0047] In Release 18, 3rd Generation Partnership Project (3GPP) carried out a study on non-overlapping subband full-duplex (SBFD) at the gNB side. In non-overlapping SBFD networks (where the time-division duplexing (TDD) carrier is partitioned between UL and DL in certain symbols and slots) , interference may occur between cooperative devices, i.e., inter-subband CLI. For example, the UL transmission of the UE 130 (named as an aggressor UE) may interfere the DL transmission of the UE 140 (named as a victim UE) . In addition, in the implementations of the present disclosure, the inter-subband CLI may be occurred in half-duplex (HD) UEs scenario or full-duplex (FD) UEs scenario.
[0048] In such communication environment, the gNBs 110 and 120, and the UEs 130, 140 and 150 may implement various schemes pertaining to reducing CLI in accordance with the present disclosure, as described below. It is noteworthy that, while the various proposed schemes may be individually or separately described below, in actual implementations some or all of the proposed schemes may be utilized or otherwise implemented jointly. Of course, each of the proposed schemes may be utilized or otherwise implemented individually or separately.
[0049] FIG. 2 illustrates an example scenario 200 for a precoding matrix indicator (PMI) or rank indicator (RI) information reporting procedure in accordance with implementations of the present disclosure. Scenario 200 involves at least an aggressor UE (e.g., the strongest aggressor UE, all aggressor UEs, or a subset of aggressor UEs) , a victim UE and a network node (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Referring to FIG. 2, in step S210, the victim UE (e.g., the UE 140) may measure a signal (e.g., a reference signal) from an aggressor UE (e.g., UE 130) to determine PMI information or RI information associated with CLI from the aggressor UE.
[0050] In step S220, the victim UE may transmit a measurement report with the PMI information or the RI information to a network node (e.g., gNB 110) for the aggressor UE to use.
[0051] The PMI information may comprise a recommended PMI or a restricted PMI. The recommended PMI may recommend a PMI (or a set of PMIs) for the aggressor UE to use, and the restricted PMI may recommend a PMI (or a set of PMIs) for the aggressor UE not to use. The recommended PMI may be the PMI (s) causing low CLI from the aggressor UE to the victim UE. The restricted PMI may be the PMI (s) causing high CLI from the aggressor UE to the victim UE.
[0052] In some implementations, the victim UE may report a recommended PMI to the network node. Then, the network node may configure a PMI to the aggressor UE according to the recommended PMI. The measurement report may comprise at least one PMI report. For example, the measurement report may comprise a first PMI report for a conventional PMI used in DL transmission with the network node, and a second PMI report which indicates the recommended PMI.
[0053] When a multi-input multi-output (MIMO) model associated with a victim UE#1 is y1=H1wx + Hi2 ibe2 + Hi3 ibe3 +n1, the victim UE#1 may measure the Hi2 and Hi3 to reduce the CLI from the aggressor UE#2 and the aggressor UE#3, wherein H1 is a channel associated with victim UE#1 on the DL subband or the UL subband, w is a precoder, x is data, Hi2 ibe2 is CLI from the aggressor UE#2, Hi2 is a channel associated with aggressor UE#2 on the DL subband or the UL subband, Hi3 ibe3 is CLI from the aggressor UE#3, Hi3 is a channel associated with aggressor UE#3 on the DL subband or the UL subband, and n1 is noise. Specifically, the victim UE#1 may determine a recommended PMI for the aggressor UE#2, and the recommended PMI for the aggressor UE#2 may make |Hi2 PMI| have the minimum value (i.e., min |Hi2 PMI|) over all PMI vectors in the codebook. In addition, the victim UE#1 may determine a recommended PMI for the aggressor UE#3, and the recommended PMI for the aggressor UE#3 may make |Hi3 PMI| have the minimum value (i.e., min |Hi3 PMI|) over all PMI vectors in the codebook.
[0054] Under a first proposed scheme for the recommended PMI in accordance with the present disclosure, the victim UE may determine the recommended PMI according to a codebook of precoders used by the aggressor UE. Then, the victim UE may report an index of the codebook associated with the recommended PMI to the network node. Specifically, the UE may measure the pilots encoded by different precoders in the codebook to find the suitable precoder for the aggressor UE, and report the precoder index (i.e., the index of the codebook associated with the recommended PMI) to the network node. In the first proposed scheme, the codebook is known by the victim UE, the aggressor UE and the network node. Accordingly, the victim UE may only report the index in the codebook associated with the recommended PMI to the network node for reducing signaling overhead.
[0055] FIG. 3 illustrates an example scenario 300 for a codebook-based recommended PMI reporting under the first proposed scheme in accordance with implementations of the present disclosure. Scenario 300 involves at least an aggressor UE, a victim UE and a network node (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Referring to FIG. 3, the victim UE#1 and the network node (i.e., gNB) may know the codebook of precoders used by the aggressor UE#2. The victim UE#1 may determine the recommended PMI according to the codebook, and report an index associated with the recommended PMI to the network node. The victim UE#1 may report two PMI report to the network node, e.g., a first PMI report (e.g., 3 bits) for a conventional PMI used in DL transmission with the network node, and a second PMI report (e.g., 1 bits) which indicates the recommended PMI.
[0056] Under a second proposed scheme for the recommended PMI in accordance with the present disclosure, the victim UE may receive a plurality of precoded pilots from the aggressor UE. Then, the victim UE may determine a recommended precoded pilot according to the precoded pilots. Then, the victim UE may report an index associated with the recommended precoded pilot (i.e., the index associated with the recommended PMI) to the network node. That is, in the second proposed scheme, the victim UE and the network node may not know the codebook used by the aggressor UE. Therefore, the UE may only measure the precoded pilots from the aggressor UE to find a suitable precoded pilot to be the recommended precoded pilot.
[0057] FIG. 4 illustrates an example scenario 400 for a codebook-less recommended PMI reporting under the second proposed scheme in accordance with implementations of the present disclosure. Scenario 400 involves at least an aggressor UE, a victim UE and a network node (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Referring to FIG. 4, the victim UE#1 may receive a plurality of precoded pilots from the aggressor UE#2. In addition, the victim UE#1 may determine a recommended precoded pilot according to the precoded pilots, and report an index associated with the recommended precoded pilot (i.e., the index associated with the recommended PMI) to the network node (i.e., gNB) . Since the victim UE#1 does not know the procoder used by the aggressor UE#2, the victim UE#1 may only report the recommended precoded pilot to the network node.
[0058] Under a third proposed scheme for the recommended PMI in accordance with the present disclosure, the victim UE may determine the recommended PMI according to a codebook of precoders used by the aggressor UE. Then, the victim UE may report a joint index associated with the recommended PMI and a PMI for DL transmission (i.e., the recommended PMI may be implicitly mapped to the PMI for DL transmission) to the network node. Specifically, the UE may measure the pilots encoded by different precoders in the codebook to find the suitable precoder for the aggressor UE, and report a joint index associated with the precoder index (i.e., the index of the code book associated with the recommended PMI) and an index of a PMI for DL transmission selected by the network node to the network node. In the third proposed scheme, the codebook is known by the victim UE, the aggressor UE and the network node. In addition, in the third proposed scheme, the victim UE may not additionally report the index associated with the recommended PMI, i.e., the recommended PMI is reported implicitly. Therefore, the extra overhead will be not generated.
[0059] FIG. 5 illustrates an example scenario 500 for a codebook-based recommended PMI reporting under the third proposed scheme in accordance with implementations of the present disclosure. Scenario 500 involves at least an aggressor UE, a victim UE and a network node (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Referring to FIG. 5, the victim UE#1 and the network node (i.e., gNB) may know the codebook of precoders used by the aggressor UE#2. The victim UE#1 may determine the recommended PMI according to the codebook. In addition, the victim UE may report a joint index (e.g., 3 bits) associated with the recommended PMI and a PMI for DL transmission (i.e., the recommended PMI may be implicitly mapped to the PMI) to the network node. For example, referring to FIG. 5, the victim UE may choose one PMI from {I, I, I, I} in the gNB codebook {I, I, I, I, x, x, x, x} which may be mapped to the recommended PMI (e.g., {I} ) in the aggressor UE codebook {I, x} . In the third proposed scheme, the victim UE#1 may report only one PMI report to the network node, e.g., the PMI report may comprise a joint encoding of a conventional PMI used in DL transmission with the network node, and the recommended PMI.
[0060] Under a fourth proposed scheme for the recommended PMI in accordance with the present disclosure, the victim UE may receive a plurality of precoded pilots from the aggressor UE. Then, the victim UE may determine a recommended precoded pilot according to the precoded pilots. Then, the victim UE may report a joint index associated with the recommended precoded pilot and a precoded pilot for DL transmission to the network node (i.e., the recommended precoded pilot may be implicitly mapped to the precoded pilot for DL transmission) . That is, in the fourth proposed scheme, the victim UE and the network node may not know the codebook used by the aggressor UE. Therefore, the UE may only measure the precoded pilots from the aggressor UE to find a suitable precoded pilot to be the recommended precoded pilot. Then, the victim UE may report a joint index associated with an index corresponding to the recommended precoded pilot and an index of a PMI for DL transmission to the network node.
[0061] FIG. 6 illustrates an example scenario 600 for a codebook-less recommended PMI reporting under the fourth proposed scheme in accordance with implementations of the present disclosure. Scenario 600 involves at least an aggressor UE, a victim UE and a network node (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Referring to FIG. 6, the victim UE#1 may receive a plurality of precoded pilots from the aggressor UE#2. In addition, the victim UE#1 may determine a recommended precoded pilot according to the precoded pilots, and report a joint index associated with the recommended precoded pilot and a precoded pilot for DL transmission to the network node (i.e., gNB) . In the fourth proposed scheme, the network node may select the conventional PMI used in DL transmission with the network node, and victim UE may select the recommended PMI (i.e., the recommended precoded pilot) .
[0062] Under a fifth proposed scheme for the recommended PMI in accordance with the present disclosure, the victim UE may receive broadcast information from the network node. The broadcast information may indicate at least one PMI associated with the at least one aggressor UE. Then, the victim UE may determine the recommended PMI. Then, the victim UE may report a differential PMI to indicate the recommended PMI according to the broadcast information. For example, when the victim UE knows a PMI of an aggressor UE, the victim UE may recommend the aggressor UE to rotate its PMI to an adjacent PMI in the codebook. That is, the differential PMI may indicate the rotation information (e.g., +1, +2, -1, or -2) between the PMI used by the aggressor UE and the recommended PMI.
[0063] FIG. 7 illustrates an example scenario 700 for a differential PMI for the recommended PMI reporting under the fifth proposed scheme in accordance with implementations of the present disclosure. Scenario 700 involves at least an aggressor UE, a victim UE and a network node (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Referring to FIG. 7, the victim UE may use the differential PMI to recommend the aggressor UE#2 to rotate its PMI to an adjacent PMI in the codebook. The victim UE may only report the differential PMI to the network node to reduce the reporting overhead.
[0064] In some implementations, the victim UE may report a restricted PMI to the network node. Then, the network node may configure a PMI to the aggressor UE according to the restricted PMI. The measurement report may comprise at least one PMI report. For example, the measurement report may comprise a first PMI report for a conventional PMI used in DL transmission with the network node, and a second PMI report which indicates the restricted PMI.
[0065] When a multi-input multi-output (MIMO) model associated with a victim UE#1 is y1=H1wx + Hi2 ibe2 + Hi3 ibe3 +n1, the victim UE#1 may measure the Hi2 and Hi3 to reduce the CLI from the aggressor UE#2 and the aggressor UE#3, wherein H1 is a channel associated with victim UE#1 on the DL subband or the UL subband, w is a precoder, x is data, Hi2 ibe2 is CLI from the aggressor UE#2, Hi2 is a channel associated with aggressor UE#2 on the DL subband or the UL subband, Hi3 ibe3 is CLI from the aggressor UE#3, Hi3 is a channel associated with aggressor UE#3 on the DL subband or the UL subband, and n1 is noise. Specifically, the victim UE#1 may determine a restricted PMI for the aggressor UE#2 (i.e., recommend the aggressor UE#2 not to use the restricted PMI) , and the restricted PMI for the aggressor UE#2 may make |Hi2 PMI| have the maximum value (i.e., max |Hi2 PMI|) over all PMI vectors in the code book. In addition, the victim UE#1 may determine a restricted PMI for the aggressor UE#3 (i.e., recommend the aggressor UE#3 not to use the restricted PMI) , and the restricted PMI for the aggressor UE#3 may make |Hi3 PMI| have the maximum value (i.e., max |Hi3 PMI|) over all PMI vectors in the code book.
[0066] Under a first proposed scheme for the restricted PMI in accordance with the present disclosure, the victim UE may determine the restricted PMI according to a codebook of precoders used by the aggressor UE. Then, the victim UE may report an index of the codebook associated with the restricted PMI to the network node. Specifically, the UE may measure the pilots encoded by different precoders in the codebook to find the suitable precoder for the aggressor UE, and report the precoder index (i.e., the index associated with the restricted PMI) to the network node. In the first proposed scheme, the codebook is known by the victim UE, the aggressor UE and the network node. Accordingly, the victim UE may only report the index in the codebook associated with the restricted PMI to the network node for reducing signaling overhead.
[0067] FIG. 8 illustrates an example scenario 800 for a codebook-based restricted PMI reporting under the first proposed scheme in accordance with implementations of the present disclosure. Scenario 800 involves at least an aggressor UE, a victim UE and a network node (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Referring to FIG. 8, the victim UE#1 and the network node (i.e., gNB) may know the codebook of precoders used by the aggressor UE#2. The victim UE#1 may determine the restricted PMI according to the codebook, and report an index associated with the restricted PMI to the network node. The victim UE#1 may report two PMI report to the network node, e.g., a first PMI report (e.g., 3 bits) for a conventional PMI used in DL transmission with the network node, and a second PMI report (e.g., 1 bits) which indicates the restricted PMI.
[0068] Under a second proposed scheme for the restricted PMI in accordance with the present disclosure, the victim UE may receive a plurality of precoded pilots from the aggressor UE. Then, the victim UE may determine a restricted precoded pilot according to the precoded pilots. Then, the victim UE may report an index associated with the restricted precoded pilot (i.e., the index associated with the restricted PMI) to the network node. That is, in the second proposed scheme, the victim UE and the network node may not know the codebook used by the aggressor UE. Therefore, the UE may only measure the precoded pilots from the aggressor UE to find a suitable precoded pilot to be the restricted precoded pilot.
[0069] FIG. 9 illustrates an example scenario 900 for a codebook-less restricted PMI reporting under the second proposed scheme in accordance with implementations of the present disclosure. Scenario 900 involves at least an aggressor UE, a victim UE and a network node (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Referring to FIG. 9, the victim UE#1 may receive a plurality of precoded pilots from the aggressor UE#2. In addition, the victim UE#1 may determine a restricted precoded pilot according to the precoded pilots, and report an index associated with the restricted precoded pilot (i.e., the index associated with the restricted PMI) to the network node (i.e., gNB) . Since the victim UE#1 does not know the procoder used by the aggressor UE#2, the victim UE#1 may only report the restricted precoded pilot to the network node.
[0070] Under a third proposed scheme for the restricted PMI in accordance with the present disclosure, the victim UE may determine the restricted PMI according to a codebook of precoders used by the aggressor UE. Then, the victim UE may report a joint index associated with the restricted PMI and a PMI for DL transmission (i.e., the restricted PMI may be implicitly mapped to the PMI for DL transmission) to the network node. Specifically, the UE may measure the pilots encoded by different precoders in the codebook to find the suitable precoder for the aggressor UE, and report a joint index associated with the precoder index (i.e., the index of the codebook associated with the restricted PMI) and an index of a PMI for DL transmission selected by the network node to the network node. In the third proposed scheme, the codebook is known by the victim UE, the aggressor UE and the network node. In addition, in the third proposed scheme, the victim UE may not additionally report the index associated with the restricted PMI, i.e., the restricted PMI is reported implicitly. Therefore, the extra overhead will be not generated.
[0071] FIG. 10 illustrates an example scenario 1000 for a codebook-based restricted PMI reporting under the third proposed scheme in accordance with implementations of the present disclosure. Scenario 1000 involves at least an aggressor UE, a victim UE and a network node (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Referring to FIG. 10, the victim UE#1 and the network node (i.e., gNB) may know the codebook of precoders used by the aggressor UE#2. The victim UE#1 may determine the restricted PMI according to the codebook. In addition, the victim UE may report a joint index (e.g., 3 bits) associated with the restricted PMI and a PMI for DL transmission (i.e., the restricted PMI may be implicitly mapped to the PMI) to the network node. For example, referring to FIG. 10, the victim UE may choose one PMI from {I, I, I, I} in the gNB codebook {I, I, I, I, x, x, x, x} which may be mapped to the restricted PMI (e.g., {I} ) in the aggressor UE codebook {I, x} . In the third proposed scheme, the victim UE#1 may report only one PMI report to the network node, e.g., the PMI report may comprise a joint encoding of a conventional PMI used in DL transmission with the network node, and the restricted PMI.
[0072] Under a fourth proposed scheme for the restricted PMI in accordance with the present disclosure, the victim UE may receive a plurality of precoded pilots from the aggressor UE. Then, the victim UE may determine a restricted precoded pilot according to the precoded pilots. Then, the victim UE may report a joint index associated with the restricted precoded pilot and a precoded pilot for DL transmission to the network node (i.e., the restricted precoded pilot may be implicitly mapped to the precoded pilot for DL transmission) . That is, in the fourth proposed scheme, the victim UE and the network node may not know the codebook used by the aggressor UE. Therefore, the UE may only measure the precoded pilots from the aggressor UE to find a suitable precoded pilot to be the restricted precoded pilot. Then, the victim UE may report a joint index associated with an index corresponding to the restricted precoded pilot and an index of a PMI for DL transmission to the network node.
[0073] FIG. 11 illustrates an example scenario 1100 for a codebook-less restricted PMI reporting under the fourth proposed scheme in accordance with implementations of the present disclosure. Scenario 1100 involves at least an aggressor UE, a victim UE and a network node (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Referring to FIG. 11, the victim UE#1 may receive a plurality of precoded pilots from the aggressor UE#2. In addition, the victim UE#1 may determine a restricted precoded pilot according to the precoded pilots, and report a joint index associated with the restricted precoded pilot and a precoded pilot for DL transmission to the network node (i.e., gNB) . In the fourth proposed scheme, the network node may select the conventional PMI used in DL transmission with the network node, and victim UE may select the restricted PMI (i.e., the restricted precoded pilot) .
[0074] Under a fifth proposed scheme for the restricted PMI in accordance with the present disclosure, the victim UE may receive broadcast information from the network node. The broadcast information may indicate at least one PMI associated with the at least one aggressor UE. Then, the victim UE may determine the restricted PMI. Then, the victim UE may report a differential PMI to indicate the restricted PMI according to the broadcast information. For example, when the victim UE knows a PMI of an aggressor UE, the victim UE may recommend the aggressor UE not to use the restricted PMI and avoid to rotate its PMI to an adjacent PMI in the codebook. That is, the differential PMI may indicate the rotation information (e.g., +1, +2, -1, or -2) between the restricted PMI and the adjacent PMI.
[0075] The RI information may comprise a recommended RI or a restricted RI. The recommended RI may recommend a rank (or a set of ranks) for the aggressor UE to use, and the restricted RI may recommend a rank (or a set of ranks) for the aggressor UE not to use. For low rank (e.g., rank-1 for one layer) , the interference is more dynamic. Therefore, the low rank CLI may be not reduced easily through the link adaption technology, but a robust CLI receiver may be appropriate to reject the low rank CLI. For high rank, the interference may be more spatially stable. Therefore, the high rank CLI may be not rejected easily, but the link adaption technology may be appropriate to reduce the high rank CLI.
[0076] In some implementations, the victim UE may report a recommended RI to the network node. Then, the network node may configure a rank to the aggressor UE according to the recommended RI. The measurement report may comprise at least one RI report. For example, the measurement report may comprise a first RI report for a conventional RI used in DL transmission with the network node, and a second RI report which indicates the recommended RI.
[0077] The recommended RI reporting may be applied to reduce the CLI from the strongest aggressor UE, all aggressor UEs, a subset of aggressor UEs, or a concatenation of aggressor UEs (i.e., the total number of streams from all aggressor UEs may be equal to the recommended RI) . In addition, the recommended RI reporting may be implemented on the DL subband or UL subband.
[0078] In some implementations, the victim UE may report a restricted RI to the network node. Then, the network node may configure a RI to the aggressor UE according to the restricted RI. The measurement report may comprise at least one RI report. For example, the measurement report may comprise a first RI report for a conventional RI used in DL transmission with the network node, and a second RI report which indicates the restricted RI.
[0079] The restricted RI reporting may be applied to reduce the CLI from the strongest aggressor UE, all aggressor UEs, or a subset of aggressor UEs. In addition, the restricted RI reporting may be implemented on the DL subband or UL subband.
[0080] In addition, in some implementations, the victim UE may further report an additional channel quality indicator (CQI) or a delta CQI to the network node to indicate an expected gain in an event that the PMI information or the RI information is adopted by the network node. For example, the victim UE may indicate how much gain can be expected if its recommendation is accepted by the network node.
[0081] FIG. 12 illustrates an example scenario 1200 for a friendly PMI reporting procedure in accordance with implementations of the present disclosure. Scenario 1200 involves an aggressor UE, a victim UE and a network node (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Referring to FIG. 12, in step S1210, the aggressor UE may receive a request (i.e., a DL request) from a network node for triggering a CLI estimation (i.e., triggering a friendly PMI operation) . The friendly PMI operation may be applied to a codebook-based approach or a codebook-less approach.
[0082] In step S1220, the aggressor UE may perform a measurement to estimate a spatial transmit covariance matrix of the aggressor UE to a victim UE channel (e.g., Hat {R} _t) .
[0083] In an implementation, when the aggressor UE performs the measurement to estimate the spatial transmit covariance matrix, the aggressor UE may compute a receive covariance matrix by listening to a sounding reference signal (SRS) of the victim UE to estimate an UL transmit covariance matrix. That is, the aggressor UE may perform the measurement according to any broadcast information from the network node.
[0084] In another implementation, when the aggressor UE performs the measurement to estimate the spatial transmit covariance matrix, the aggressor UE may compute a receive covariance matrix on a received data and a demodulation reference signal (DM-RS) to estimate an uplink transmit covariance matrix.
[0085] In another implementation, when the aggressor UE performs the measurement to estimate the spatial transmit covariance matrix, the aggressor UE may compute a receive and transmit covariance matrix according to adjacent band measurements.
[0086] The number of transmit antennas and the number of receive antennas at a UE may be not the same (e.g., 4 Rx and 2 Tx) . Therefore, the UE may need to take 2x2 subset matrix from 4x4 matrix.
[0087] In step S1230, the aggressor UE may determine at least one recommended or restricted PMI according to the measurement. Specifically, the aggressor UE may compute w^H Hat {R} _t w among all w in the transmit codebook, where w means the PMIs in the transmit codebook. Then, the aggressor UE may determine to eliminate the PMIs that lead to larger values of w^H Hat {R} _t.
[0088] In step S1240, the aggressor UE may transmit the at least one recommended or restricted PMI to the network node to report the network node which PMI or PMIs are not suitable.
[0089] In step S1250, when the network node receives the at least one recommended or restricted PMI from the aggressor UE, the network node may know which PMI or PMIs are not suitable for the victim UE. Then, the network node may establish a PMI codebook by removing the PMI (or PMIs) reported by the aggressor UE, and select / configure a suitable PMI (or friendly PMI) for aggressor UE to use on UL transmission.
[0090] In some implementations of the present disclosure, the victim UE may obtain modulation information associated with an aggressor UE from a network node or through a blind detection. Then, the victim UE may measure a reference signal of the aggressor UE according to the modulation information. Then, the victim UE may perform a CLI strategy (or perform dynamic or semi-static switching between different CLI strategies) according to the reference signal and the modulation information associated with the aggressor UE (i.e., soft coordination) , or according to a command from the network node (i.e., enhanced coordination) . That is, in an example, the victim UE may determine the current CLI level according to the reference signal and the modulation information associated with the aggressor UE, and perform (or switch to) a suitable CLI strategy according to the CLI level. In another example, the victim UE may perform a CLI strategy indicated by the command from the network node.
[0091] The CLI strategy may comprise at least of treating a CLI of the aggressor UE as a noise to decode a message for the victim UE, jointly demapping messages for the victim UE and the aggressor UE, and rejecting a CLI of the aggressor UE to decode a message for the victim UE. In an example, when a CLI is weak, the victim UE may treat the CLI of the aggressor UE as a noise to decode a message for the victim UE. In another example, when a CLI is strong, the victim UE may jointly demap messages for the victim UE and the aggressor UE to decode a message for the victim UE. In another example, when the victim UE is configured a multi-antenna receiver, the victim UE may reject the CLI of the aggressor UE to decode a message for the victim UE.
[0092] In the soft coordination, in some implementations, for the joint demap, the victim UE may need to know the modulation information associated with the aggressor UE. The modulation information may be shared from the network node communicating with the aggressor UE to the network node communicating with the victim UE. In some implementations, the victim UE may need to measure the DM-RS of the aggressor UE. The DM-RS information of the aggressor UE may be shared from the network node communicating with the aggressor UE to the network node communicating with the victim UE. In some implementations, the victim UE may measure the SRS and DM-RS of the aggressor UE to determine a recommended modulation associated with the aggressor UE, and transmit the recommended modulation to the network node communicating with the victim UE. Then, the network node communicating with the victim UE may transmit the recommended modulation to the network node communicating with the aggressor UE. The network node communicating with the aggressor UE may choose the modulation and coding scheme (MCS) according to the recommended modulation. The soft coordination procedure also can be applied to multi-user MIMO (MU-MIMO) .
[0093] FIG. 13 illustrates an example scenario 1300 for a soft coordination procedure in accordance with implementations of the present disclosure. Scenario 1300 involves an aggressor UE, a victim UE, a network node communicating with the aggressor UE (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) , and a network node communicating with the victim UE (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Referring to FIG. 13, the network node 1 communicating with the aggressor UE may determine the sharing information (i.e., the modulation information M1 associated with the aggressor UE) , and transmit the sharing information to the network node 3 through the network node interface (e.g., gNB interface) between the network node 1 and the network node 3. The network node 3 communicating with the victim UE may determine a modulation configuration (i.e., MCS3) for the victim UE according to the sharing information. In addition, the network node 3 may transmit the modulation information M1 to the victim UE through broadcast information (e.g., broadcast DL indication) or DL signaling (e.g., DL indication) . The victim UE may measure a reference signal (e.g., DM-RS1 of the aggressor UE) of the aggressor UE according to the modulation information M1 associated with the aggressor UE to determine a CLI strategy.
[0094] FIG. 14 illustrates another example scenario 1400 for a soft coordination procedure in accordance with implementations of the present disclosure. Scenario 1400 involves an aggressor UE, a victim UE, a network node communicating with the aggressor UE (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) , and a network node communicating with the victim UE (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Referring to FIG. 14, the network node 1 communicating with the aggressor UE may determine the sharing information (i.e., the modulation information M1 associated with the aggressor UE) , and transmit the sharing information to the network node 3 through the network node interface (e.g., gNB interface) between the network node 1 and the network node 3. The network node 3 communicating with the victim UE may determine a modulation configuration (i.e., MCS3) for the victim UE according to the sharing information, but the network node 3 may not transmit the modulation information M1 to the victim UE. Therefore, the victim UE may blindly detect the modulation information associated with the aggressor UE according to the modulation configuration MCS3. Then, the victim UE may measure a reference signal (e.g., DM-RS1 of the aggressor UE) of the aggressor UE according to the detected modulation information associated with the aggressor UE to determine a CLI strategy.
[0095] FIG. 15 illustrates another example scenario 1500 for a soft coordination procedure in accordance with implementations of the present disclosure. Scenario 1500 involves an aggressor UE, a victim UE, a network node communicating with the aggressor UE (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) , and a network node communicating with the victim UE (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Referring to FIG. 15, the victim UE may blindly detect the modulation information associated with the aggressor UE according to the modulation configuration (i.e., MCS3) from the network node 3. Then, the victim UE may measure a reference signal (e.g., DM-RS1 of the aggressor UE) of the aggressor UE according to the detected modulation information associated with the aggressor UE to determine a CLI strategy.
[0096] FIG. 16 illustrates another example scenario 1600 for a soft coordination procedure in accordance with implementations of the present disclosure. Scenario 1600 involves an aggressor UE, a victim UE, a network node communicating with the aggressor UE (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) , and a network node communicating with the victim UE (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Referring to FIG. 16, the network node 3 communicating with the victim UE may transmit a request to the victim UE to request a recommended modulation for the aggressor UE. After receiving the request, the victim UE may listen to the reference signal (e.g., SRS1) of the aggressor UE to determine the recommended modulation (i.e., recommended M1) , and transmit the recommended modulation to the network node 3. The network node 3 may share the recommended M1 to the network node 1 communicating with the aggressor UE. The network node 1 may determine the sharing information (i.e., the modulation information M1 associated with the aggressor UE) according to the recommended M1, and transmit the sharing information to the network node 3 through the network node interface (e.g., gNB interface) between the network node 1 and the network node 3. The network node 3 may determine a modulation configuration (i.e., MCS3) for the victim UE according to the modulation information M1. In addition, the network node 3 may transmit the modulation information M1 to the victim UE through broadcast information (e.g., broadcast DL indication) or DL signaling (e.g., DL indication) . The victim UE may measure a reference signal (e.g., DM-RS1 of the aggressor UE) of the aggressor UE according to the modulation information M1 associated with the aggressor UE to determine a CLI strategy.
[0097] FIG. 17 illustrates another example scenario 1700 for a soft coordination procedure in accordance with implementations of the present disclosure. Scenario 1700 involves an aggressor UE, a victim UE, a network node communicating with the aggressor UE (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) , and a network node communicating with the victim UE (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Referring to FIG. 17, the network node 3 communicating with the victim UE may transmit a request to the victim UE to request a recommended modulation for the aggressor UE. After receiving the request, the victim UE may listen to the reference signal (e.g., SRS1) of the aggressor UE to determine the recommended modulation (i.e., recommended M1) for the aggressor UE, and transmit the recommended modulation to the network node 3. The network node 3 may share the recommended M1 to the network node 1 communicating with the aggressor UE. The victim UE may blindly detect the modulation information associated with the aggressor UE according to the modulation configuration (i.e., MCS3) from the network node 3. Then, the victim UE may measure a reference signal (e.g., DM-RS1 of the aggressor UE) of the aggressor UE according to the detected modulation information associated with the aggressor UE to determine a CLI strategy.
[0098] In some implementations, when the network node (e.g., network node 3 of FIG. 16 and FIG. 17) transmits a request to the victim UE to request a recommended modulation for the aggressor UE, the network node may also provide a set of constellation sizes (e.g., offset-quaternary phase shift keying (QPSK) , 8PSK) to the victim UE to choose from. In some implementations, the recommended M1 may comprise the information about delta CQI indicating the CQI gain for the victim UE. For example, if castellation set is {QPSK, 8PSK} , the delta CQI may indicate the gain of using QPSK over 8PSK (i.e., the smallest constellation over the largest constellation) . In some implementations, the recommended M1 may be combined with the recommended PMI or RI.
[0099] In the enhanced coordination, in some implementations, for joint demap, the victim UE may need to know the modulation information associated with the aggressor UE. The modulation information may be shared from the network node communicating with the aggressor UE to the network node communicating with the victim UE. In some implementations, the victim UE may need to measure the DM-RS of the aggressor UE. The DM-RS information of the aggressor UE may be shared from the network node communicating with the aggressor UE to the network node communicating with the victim UE. In some implementations, the network node communicating with the victim UE and the network node communicating with the aggressor UE may jointly select or design the modulation configuration (e.g., MCS1, MCS3) of the aggressor UE and the victim UE. The joint modulation information associated with the aggressor UE and the victim UE may be shared on the network node interface (e.g., the interface between the network node 1 and the network node 3) . In addition, in the enhanced coordination, the network node communicating with the victim UE may transmit a command to the victim UE to indicate the CLI strategy for the victim UE. The victim UE may need to measure SRS of the aggressor UE to determine the channel state information (CSI) (or CQI) associated with the aggressor UE, and the network node communicating with the victim UE and the network node communicating with the aggressor UE may determine the joint modulation information according to the CSI associated with the aggressor UE. The enhanced coordination procedure also can be applied to MU-MIMO.
[0100] FIG. 18 illustrates an example scenario 1800 for an enhanced coordination procedure in accordance with implementations of the present disclosure. Scenario 1800 involves an aggressor UE, a victim UE, a network node communicating with the aggressor UE (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) , and a network node communicating with the victim UE (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Referring to FIG. 18, the network node 3 communicating with the victim UE may transmit a request to the victim UE to request a CSI associated with the aggressor UE. After receiving the request, the victim UE may listen to the reference signal (e.g., SRS1) of the aggressor UE to determine the CSI associated with the aggressor UE, and report the CSI associated with the aggressor UE to the network node 3. The network node 3 may share the CSI associated with the aggressor UE to the network node 1 communicating with the aggressor UE. Then, the network node 1 and the network node 3 may jointly determine or select the joint modulation information associated with the victim UE and the aggressor UE according to the CSI associated with the aggressor UE on the network node interface (e.g., gNB interface) between the network node 1 and the network node 3. The network node 1 may determine a modulation configuration (i.e., MCS1) for the aggressor UE according to the joint modulation information. The network node 3 may determine a modulation configuration (i.e., MCS3) for the victim UE and the modulation information M1 of the aggressor UE according to the joint modulation information. Then, the network node 3 may transmit the modulation information M1 to the victim UE through broadcast information (e.g., broadcast DL indication) or DL signaling (e.g., DL indication) . The victim UE may measure a reference signal (e.g., DM-RS1 of the aggressor UE) of the aggressor UE according to the modulation information M1 associated with the aggressor UE. In addition, the network node 3 may transmit a command to the victim UE according to the joint modulation information to indicate a CLI strategy for the victim UE. The victim UE may perform the CLI strategy according to the command.
[0101] FIG. 19 illustrates another example scenario 1900 for an enhanced coordination procedure in accordance with implementations of the present disclosure. Scenario 1900 involves an aggressor UE, a victim UE, a network node communicating with the aggressor UE (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) , and a network node communicating with the victim UE (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Referring to FIG. 19, the network node 3 communicating with the victim UE may transmit a request to the victim UE to request a CSI associated with the aggressor UE. After receiving the request, the victim UE may listen to the reference signal (e.g., SRS1) of the aggressor UE to determine the CSI associated with the aggressor UE, and report the CSI associated with the aggressor UE to the network node 3. The network node 3 may share the CSI associated with the aggressor UE to the network node 1 communicating with the aggressor UE. Then, the network node 1 and the network node 3 may jointly determine or select the joint modulation information associated with the victim UE and the aggressor UE according to the CSI associated with the aggressor UE on the network node interface (e.g., gNB interface) between the network node 1 and the network node 3. The network node 1 may determine a modulation configuration (i.e., MCS1) for the aggressor UE according to the joint modulation information. The network node 3 may determine a modulation configuration (i.e., MCS3) for the victim UE according to the joint modulation information. The victim UE may blindly detect the modulation information associated with the aggressor UE according to the modulation configuration (i.e., MCS3) from the network node 3. Then, the victim UE may measure a reference signal (e.g., DM-RS1 of the aggressor UE) of the aggressor UE according to the detected modulation information associated with the aggressor UE. In addition, the network node 3 may transmit a command to the victim UE according to the joint modulation information to indicate a CLI strategy for the victim UE. The victim UE may perform the CLI strategy according to the command.
[0102] FIG. 20 illustrates an example scenario 2000 for a CLI strategy selection in an enhanced coordination procedure in accordance with implementations of the present disclosure. Scenario 2000 involves an aggressor UE, a victim UE, a network node communicating with the aggressor UE (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) , and a network node communicating with the victim UE (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Referring to FIG. 20, in the enhanced coordination procedure, the network node (e.g., gNB 3) communicating with the victim UE (e.g., UE 3) may select one of the CLI strategies (or receivers) for the victim UE through a DL request or command. For example, referring to table of FIG. 20, the network node (e.g., gNB 3) communicating with the victim UE (e.g., UE 3) may select one of tree strategies (e.g., “reject” , “joint demap” , or “treat as noise” ) for the victim UE.
[0103] FIG. 21 illustrates another example scenario 2100 for a CLI strategy selection in an enhanced coordination procedure in accordance with implementations of the present disclosure. Scenario 2100 involves an aggressor UE, one or more victim UEs, a network node communicating with the aggressor UE (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) , and a network node communicating with the victim UE (e.g., a (macro / micro) base station) of a serving cell which may be a part of a wireless network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Referring to FIG. 21, in the enhanced coordination procedure, for MU-MIMO, the network node (e.g., gNB 3) communicating with the UEs (e.g., UE 3 and UE 3’ ) may select one of the CLI strategies (or receivers) for the victim UE (e.g., UE 3) through a DL request or command, and select another CLI strategy for the interference between co-scheduled users (e.g., UE 3 and UE 3’) in the same cell. For example, referring to table of FIG. 21, the network node (e.g., gNB 3) communicating with the victim UE (e.g., UE 3) may select one of tree strategies (e.g., “reject” , “joint demap” , or “treat as noise” ) for the victim UE, and also select one of tree strategies (e.g., “reject” , “joint demap” , or “treat as noise” ) for the interference between co-scheduled users (e.g., UE 3 and UE 3’) .
[0104] Illustrative Implementations
[0105] FIG. 22 illustrates an example communication system 2200 having at least an example communication apparatus 2210 and an example network apparatus 2220 in accordance with an implementation of the present disclosure. Each of communication apparatus 2210 and network apparatus 2220 may perform various functions to implement schemes, techniques, processes and methods described herein pertaining to reducing CLI, including the various schemes described above with respect to various proposed designs, concepts, schemes and methods described above and with respect to user equipment and network apparatus in mobile communications, including scenarios / schemes described above as well as processes 2300, 2400, 2500 and 2600 described below.
[0106] Communication apparatus 2210 may be a part of an electronic apparatus, which may be a UE such as a portable or mobile apparatus, a wearable apparatus, a wireless communication apparatus or a computing apparatus. For instance, communication apparatus 2210 may be implemented in a smartphone, a smartwatch, a personal digital assistant, a digital camera, or a computing equipment such as a tablet computer, a laptop computer or a notebook computer. Communication apparatus 2210 may also be a part of a machine type apparatus, which may be an IoT, NB-IoT, or IIoT apparatus such as an immobile or a stationary apparatus, a home apparatus, a wire communication apparatus or a computing apparatus. For instance, communication apparatus 2210 may be implemented in a smart thermostat, a smart fridge, a smart door lock, a wireless speaker or a home control center. Alternatively, communication apparatus 2210 may be implemented in the form of one or more integrated-circuit (IC) chips such as, for example and without limitation, one or more single-core processors, one or more multi-core processors, one or more reduced-instruction set computing (RISC) processors, or one or more complex-instruction-set-computing (CISC) processors. Communication apparatus 2210 may include at least some of those components shown in FIG. 22 such as a processor 2212, for example. Communication apparatus 2210 may further include one or more other components not pertinent to the proposed scheme of the present disclosure (e.g., internal power supply, display device and / or user interface device) , and, thus, such component (s) of communication apparatus 2210 are neither shown in FIG. 22 nor described below in the interest of simplicity and brevity.
[0107] Network apparatus 2220 may be a part of a network apparatus, which may be a network node such as a satellite, a base station, a small cell, a router or a gateway. For instance, network apparatus 2220 may be implemented in an eNodeB in an LTE network, in a gNB in a 5G / NR, IoT, NB-IoT or IIoT network or in a satellite or base station in a 6G network. Alternatively, network apparatus 2220 may be implemented in the form of one or more IC chips such as, for example and without limitation, one or more single-core processors, one or more multi-core processors, or one or more RISC or CISC processors. Network apparatus 2220 may include at least some of those components shown in FIG. 22 such as a processor 2222, for example. Network apparatus 2220 may further include one or more other components not pertinent to the proposed scheme of the present disclosure (e.g., internal power supply, display device and / or user interface device) , and, thus, such component (s) of network apparatus 2220 are neither shown in FIG. 22 nor described below in the interest of simplicity and brevity.
[0108] In one aspect, each of processor 2212 and processor 2222 may be implemented in the form of one or more single-core processors, one or more multi-core processors, or one or more CISC processors. That is, even though a singular term “a processor” is used herein to refer to processor 2212 and processor 2222, each of processor 2212 and processor 2222 may include multiple processors in some implementations and a single processor in other implementations in accordance with the present disclosure. In another aspect, each of processor 2212 and processor 2222 may be implemented in the form of hardware (and, optionally, firmware) with electronic components including, for example and without limitation, one or more transistors, one or more diodes, one or more capacitors, one or more resistors, one or more inductors, one or more memristors and / or one or more varactors that are configured and arranged to achieve specific purposes in accordance with the present disclosure. In other words, in at least some implementations, each of processor 2212 and processor 2222 is a special-purpose machine specifically designed, arranged and configured to perform specific tasks including autonomous reliability enhancements in a device (e.g., as represented by communication apparatus 2210) and a network (e.g., as represented by network apparatus 2220) in accordance with various implementations of the present disclosure.
[0109] In some implementations, communication apparatus 2210 may also include a transceiver 2216 coupled to processor 2212 and capable of wirelessly transmitting and receiving data. In some implementations, communication apparatus 2210 may further include a memory 2214 coupled to processor 2212 and capable of being accessed by processor 2212 and storing data therein. In some implementations, network apparatus 2220 may also include a transceiver 2226 coupled to processor 2222 and capable of wirelessly transmitting and receiving data. In some implementations, network apparatus 2220 may further include a memory 2224 coupled to processor 2222 and capable of being accessed by processor 2222 and storing data therein. Accordingly, communication apparatus 2210 and network apparatus 2220 may wirelessly communicate with each other via transceiver 2216 and transceiver 2226, respectively. To aid better understanding, the following description of the operations, functionalities and capabilities of each of communication apparatus 2210 and network apparatus 2220 is provided in the context of a mobile communication environment in which communication apparatus 2210 is implemented in or as a communication apparatus or a UE and network apparatus 2220 is implemented in or as a network node of a communication network.
[0110] In some implementations, processor 2212 may measure, via transceiver 2216, a signal from an aggressor UE to determine PMI information or RI information associated with CLI from the aggressor UE. Processor 2212 may transmit, via transceiver 2216, a measurement report with the PMI information or the RI information to network apparatus 2220.
[0111] In some implementations, the PMI information may comprise a recommended PMI or a restricted PMI. The recommended PMI may recommend a PMI for the aggressor UE to use, and the restricted PMI may recommend a PMI for the aggressor UE not to use.
[0112] In some implementations, processor 2212 may determine the recommended PMI or the restricted PMI according to a codebook of precoders used by the aggressor UE. Processor 2212 may report, via transceiver 2216, an i ndex of the codebook associated with the recommended PMI or the restricted PMI to network apparatus 2220.
[0113] In some implementations, processor 2212 may receive, via transceiver 2216, a plurality of precoded pilots from the aggressor UE. Processor 2212 may determine a recommended precoded pilot or a restricted precoded pilot according to the precoded pilots. Processor 2212 may report, via transceiver 2216, an index associated with the recommended precoded pilot or the restricted precoded pilot to network apparatus 2220.
[0114] In some implementations, processor 2212 may determine the recommended PMI or the restricted PMI according to a codebook of precoders used by the aggressor UE. Processor 2212 may report, via transceiver 2216, a joint index associated with the recommended PMI and a PMI for downlink transmission, or a joint index associated with the restricted PMI and a PMI for downlink transmission to network apparatus 2220.
[0115] In some implementations, processor 2212 may receive, via transceiver 2216, a plurality of precoded pilots from the aggressor UE. Processor 2212 may determine a recommended precoded pilot or a restricted precoded pilot according to the precoded pilots. Processor 2212 may report, via transceiver 2216, a joint index associated with the recommended precoded pilot and a precoded pilot for downlink transmission, or a joint index associated with the restricted precoded pilot and a precoded pilot for downlink transmission to network apparatus 2220.
[0116] In some implementations, processor 2212 may receive, via transceiver 2216, broadcast information which indicates at least one PMI associated with the at least one aggressor UE from network apparatus 2220. Processor 2212 may determine the recommended PMI or the restricted PMI. Processor 2212 may report, via transceiver 2216, a differential PMI to indicate the recommended PMI or the restricted PMI according to the broadcast information.
[0117] In some implementations, the RI information may comprise. a recommended RI or a restricted RI. The recommended RI may recommend a rank for the aggressor UE to use, and the restricted RI may recommend a rank for the aggressor UE not to use.
[0118] In some implementations, processor 2212 may report, via transceiver 2216, an additional CQI or a delta CQI to indicate an expected gain in an event that the PMI information or the RI information is adopted.
[0119] In some implementations, processor 2212 may receive, via transceiver 2216, a request from network apparatus 2220 for triggering a CLI estimation. Processor 2212 may perform a measurement to estimate a spatial transmit covariance matrix of the apparatus to a victim UE. Processor 2212 may determine at least one recommended or restricted PMI according to the measurement. Processor 2212 may transmit, via transceiver 2216, the at least one recommended or restricted PMI to network apparatus 2220.
[0120] In some implementations, processor 2212 may compute a receive covariance matrix by listening to an SRS of the victim UE. In some implementations, processor 2212 may compute a receive covariance matrix on a received data and a DM-RS to estimate an uplink transmit covariance matrix. In some implementations, processor 2212 may compute a receive and transmit covariance matrix according to adjacent band measurements.
[0121] In some implementations, processor 2212 may obtain modulation information associated with an aggressor UE from network apparatus 2220 or through a blind detection. Processor 2212 may measure, via transceiver 2216, a reference signal of the aggressor UE according to the modulation information. Processor 2212 may perform a CLI strategy according to the reference signal and the modulation information associated with the aggressor UE, or according to a command from network apparatus 2220.
[0122] In some implementations, the CLI strategy may comprise at least of treating a CLI of the aggressor UE as a noise to decode a message for the apparatus, jointly demapping messages for the apparatus and the aggressor UE, and rejecting a CLI of the aggressor UE to decode a message for the apparatus.
[0123] In some implementations, processor 2212 may blindly detect the modulation information associated with the aggressor UE according to a modulation configuration from network apparatus 2220.
[0124] In some implementations, processor 2212 may receive, via transceiver 2216, a request from network apparatus 2220. Processor 2212 may transmit, via transceiver 2216, a recommended modulation for the aggressor UE to network apparatus 2220 according to the request.
[0125] In some implementations, processor 2212 may receive, via transceiver 2216, a request from the network node to request CSI associated with the aggressor UE. Processor 2212 may measure a reference signal from the aggressor UE to determine the CSI associated with the aggressor UE. Processor 2212 may report, via transceiver 2216, the CSI associated with the aggressor UE to network apparatus 2220.
[0126] In some implementations, processor 2222 may obtain sharing information from a second network node. Processor 2222 may determine a modulation configuration for at least one communication apparatus 2210 communicating with network apparatus 2220 according to the sharing information. Processor 2222 may transmit, via transceiver 2226, the modulation configuration to the at least one communication apparatus 2210.
[0127] In some implementations, the sharing information may comprise modulation information associated with an aggressor UE communicating with the second network node.
[0128] In some implementations, processor 2222 may transmit, via transceiver 2226, the modulation information associated with the aggressor UE to the at least one communication apparatus 2210.
[0129] In some implementations, processor 2222 may transmit, via transceiver 2226, a request to the at least one communication apparatus 2210 to request a recommended modulation for the aggressor UE. Processor 2222 may receive, via transceiver 2226, the recommended modulation from the at least one communication apparatus 2210. Processor 2222 may transmit, via transceiver 2226, the recommended modulation to the second network node. Processor 2222 may receive, via transceiver 2226, the modulation information associated with the aggressor UE from the second network node. Processor 2222 may transmit, via transceiver 2226, the modulation information associated with the aggressor UE to the at least one communication apparatus 2210.
[0130] In some implementations, the sharing information may comprise joint modulation information associated the at least one communication apparatus 2210 and an aggressor UE communicating with the second network node.
[0131] In some implementations, processor 2222 may transmit, via transceiver 2226, a request to the at least one communication apparatus 2210 to request CSI associated with the aggressor UE. Processor 2222 may receive, via transceiver 2226, the CSI associated with the aggressor UE from the at least one communication apparatus 2210. Processor 2222 may determine the joint modulation information according to the CSI associated with the aggressor UE. Processor 2222 may determine modulation information associated with the aggressor UE according to the joint modulation information. Processor 2222 may transmit, via transceiver 2226, transmit the modulation information associated with the aggressor UE to the at least one communication apparatus 2210. Processor 2222 may transmit, via transceiver 2226, transmit a command to the at least one communication apparatus 2210 according to the joint modulation information, wherein the command indicates at least one CLI strategy for the at least one communication apparatus 2210.
[0132] Illustrative Processes
[0133] FIG. 23 illustrates an example process 2300 in accordance with an implementation of the present disclosure. Process 2300 may be an example implementation of above scenarios / schemes, whether partially or completely, with respect to reducing CLI with the present disclosure. Process 2300 may represent an aspect of implementation of features of communication apparatus 2210. Process 2300 may include one or more operations, actions, or functions as illustrated by one or more of blocks 2310 and 2320. Although illustrated as discrete blocks, various blocks of process 2300 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks of process 2300 may be executed in the order shown in FIG. 23 or, alternatively, in a different order. Process 2300 may be implemented by communication apparatus 2210 or any suitable UE or machine type devices. Solely for illustrative purposes and without limitation, process 2300 is described below in the context of communication apparatus 2210. Process 2300 may begin at block 2310.
[0134] At 2310, process 2300 may involve processor 2212 of communication apparatus 2210 measuring a signal from an aggressor UE to determine PMI information or RI information associated with CLI from the aggressor UE. Process 2300 may proceed from 2310 to 2320.
[0135] At 2320, process 2300 may involve processor 2212 transmitting, via transceiver 2216 of communication apparatus 2210, a measurement report with the PMI information or the RI information to a network node.
[0136] In some implementations, process 2300 may involve processor 2212 determining the recommended PMI or the restricted PMI according to a codebook of precoders used by the aggressor UE. Process 2300 may involve processor 2212 reporting, via transceiver 2216, an index of the codebook associated with the recommended PMI or the restricted PMI to the network node.
[0137] In some implementations, process 2300 may involve processor 2212 receiving, via transceiver 2216, a plurality of precoded pilots from the aggressor UE. Process 2300 may involve processor 2212 determining a recommended precoded pilot or a restricted precoded pilot according to the precoded pilots. Process 2300 may involve processor 2212 reporting, via transceiver 2216, an index associated with the recommended precoded pilot or the restricted precoded pilot to the network node.
[0138] In some implementations, process 2300 may involve processor 2212 determining the recommended PMI or the restricted PMI according to a codebook of precoders used by the aggressor UE. Process 2300 may involve processor 2212 reporting, via transceiver 2216, a joint index associated with the recommended PMI and a PMI for downlink transmission, or a joint index associated with the restricted PMI and a PMI for downlink transmission to the network node.
[0139] In some implementations, process 2300 may involve processor 2212 receiving, via transceiver 2216, a plurality of precoded pilots from the aggressor UE. Process 2300 may involve processor 2212 determining a recommended precoded pilot or a restricted precoded pilot according to the precoded pilots. Process 2300 may involve processor 2212 reporting, via transceiver 2216, a joint index associated with the recommended precoded pilot and a precoded pilot for downlink transmission, or a joint index associated with the restricted precoded pilot and a precoded pilot for downlink transmission to the network node.
[0140] In some implementations, process 2300 may involve processor 2212 receiving, via transceiver 2216, broadcast information which indicates at least one PMI associated with the at least one aggressor UE from the network node. Process 2300 may involve processor 2212 determining the recommended PMI or the restricted PMI. Process 2300 may involve processor 2212 reporting, via transceiver 2216, a differential PMI to indicate the recommended PMI or the restricted PMI according to the broadcast information.
[0141] In some implementations, process 2300 may involve processor 2212 reporting, via transceiver 2216, an additional CQI or a delta CQI to indicate an expected gain in an event that the PMI information or the RI information is adopted.
[0142] FIG. 24 illustrates an example process 2400 in accordance with an implementation of the present disclosure. Process 2400 may be an example implementation of above scenarios / schemes, whether partially or completely, with respect to reducing CLI with the present disclosure. Process 2400 may represent an aspect of implementation of features of communication apparatus 2210. Process 2400 may include one or more operations, actions, or functions as illustrated by one or more of blocks 2410, 2420, 2430 and 2440. Although illustrated as discrete blocks, various blocks of process 2400 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks of process 2400 may be executed in the order shown in FIG. 24 or, alternatively, in a different order. Process 2400 may be implemented by communication apparatus 2210 or any suitable UE or machine type devices. Solely for illustrative purposes and without limitation, process 2400 is described below in the context of communication apparatus 2210. Process 2400 may begin at block 2410.
[0143] At 2410, process 2400 may involve processor 2212 of communication apparatus 2210 receiving, via transceiver 2216 of communication apparatus 2210, a request from a network node for triggering a CLI estimation. Process 2400 may proceed from 2410 to 2420.
[0144] At 2420, process 2400 may involve processor 2212 performing a measurement to estimate a spatial transmit covariance matrix of the apparatus to a victim UE. Process 2400 may proceed from 2420 to 2430.
[0145] At 2430, process 2400 may involve processor 2212 determining at least one recommended or restricted PMI according to the measurement. Process 2400 may proceed from 2430 to 2440.
[0146] At 2440, process 2400 may involve processor 2212 transmitting via transceiver 2216, the at least one recommended or restricted PMI to the network node.
[0147] In some implementations, process 2400 may involve processor 2212 computing a receive covariance matrix by listening to an SRS of the victim UE. Process 2400 may involve processor 2212 computing a receive covariance matrix on a received data and a DM-RS to estimate an uplink transmit covariance matrix. Process 2400 may involve processor 2212 computing a receive and transmit covariance matrix according to adjacent band measurement.
[0148] FIG. 25 illustrates an example process 2500 in accordance with an implementation of the present disclosure. Process 2500 may be an example implementation of above scenarios / schemes, whether partially or completely, with respect to reducing CLI with the present disclosure. Process 2500 may represent an aspect of implementation of features of communication apparatus 2210. Process 2500 may include one or more operations, actions, or functions as illustrated by one or more of blocks 2510, 2520 and 2530. Although illustrated as discrete blocks, various blocks of process 2500 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks of process 2500 may be executed in the order shown in FIG. 25 or, alternatively, in a different order. Process 2500 may be implemented by communication apparatus 2210 or any suitable UE or machine type devices. Solely for illustrative purposes and without limitation, process 2500 is described below in the context of communication apparatus 2210. Process 2500 may begin at block 2510.
[0149] At 2510, process 2500 may involve processor 2212 of communication apparatus 2210 obtaining modulation information associated with an aggressor UE from a network node or through a blind detection. Process 2500 may proceed from 2510 to 2520.
[0150] At 2520, process 2500 may involve processor 2212 measuring a reference signal of the aggressor UE according to the modulation information. Process 2500 may proceed from 2520 to 2530.
[0151] At 2530, process 2500 may involve processor 2212 performing a CLI strategy according to the reference signal and the modulation information associated with the aggressor UE, or according to a command from the network node.
[0152] In some implementations, process 2500 may involve processor 2212 blindly detecting the modulation information associated with the aggressor UE according to a modulation configuration from the network node.
[0153] In some implementations, process 2500 may involve processor 2212 receiving, via transceiver 2216 of communication apparatus 2210, a request from the network node. Process 2500 may involve processor 2212 transmitting, via transceiver 2216, a recommended modulation for the aggressor UE to the network node according to the request.
[0154] In some implementations, process 2500 may involve processor 2212 receiving, via transceiver 2216, a request from the network node to request CSI associated with the aggressor UE. Process 2500 may involve processor 2212 measuring a reference signal from the aggressor UE to determine the CSI associated with the aggressor UE. Process 2500 may involve processor 2212 reporting, via transceiver 2216, the CSI associated with the aggressor UE to the network node.
[0155] FIG. 26 illustrates an example process 2600 in accordance with another implementation of the present disclosure. Process 2600 may be an example implementation of above scenarios / schemes, whether partially or completely, with respect to reducing CLI with the present disclosure. Process 2600 may represent an aspect of implementation of features of network apparatus 2220. Process 2600 may include one or more operations, actions, or functions as illustrated by one or more of blocks 2610, 2620 and 2630. Although illustrated as discrete blocks, various blocks of process 2600 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks of process 2600 may be executed in the order shown in FIG. 26 or, alternatively, in a different order. Process 2600 may be implemented by network apparatus 2220 or any base stations or network nodes. Solely for illustrative purposes and without limitation, process 2600 is described below in the context of network apparatus 2220. Process 2600 may begin at block 2610.
[0156] At 2610, process 2600 may involve processor 2222 of network apparatus 2220 obtaining sharing information from a second network node. Process 2600 may proceed from 2610 to 2620.
[0157] At 2620, process 2600 may involve processor 2222 determining a modulation configuration for at least one UE communicating with the first network node according to the sharing information. Process 2600 may proceed from 2620 to 2630.
[0158] At 2630, process 2600 may involve processor 2222 transmitting, via transceiver 2226 of network apparatus 2220, the modulation configuration to the at least one UE.
[0159] In some implementations, process 2600 may involve processor 2222 transmitting, via transceiver 2226, the modulation information associated with the aggressor UE to the at least one UE.
[0160] In some implementations, process 2600 may involve processor 2222 transmitting, via transceiver 2226, a request to the at least one UE to request a recommended modulation for the aggressor UE. Process 2600 may involve processor 2222 receiving, via transceiver 2226, the recommended modulation from the at least one UE. Process 2600 may involve processor 2222 transmitting, via transceiver 2226, the recommended modulation to the second network node. Process 2600 may involve processor 2222 receiving, via transceiver 2226, the modulation information associated with the aggressor UE from the second network node. Process 2600 may involve processor 2222 transmitting, via transceiver 2226, the modulation information associated with the aggressor UE to the at least one UE.
[0161] In some implementations, process 2600 may involve processor 2222 transmitting, via transceiver 2226, a request to the at least one UE to request CSI associated with the aggressor UE. Process 2600 may involve processor 2222 receiving, via transceiver 2226, the CSI associated with the aggressor UE from the at least one UE. Process 2600 may involve processor 2222 determining the joint modulation information according to the CSI associated with the aggressor UE. Process 2600 may involve processor 2222 determining modulation information associated with the aggressor UE according to the joint modulation information. Process 2600 may involve processor 2222 transmitting, via transceiver 2226, the modulation information associated with the aggressor UE to the at least one UE. Process 2600 may involve processor 2222 transmitting, via transceiver 2226, a command to the at least one UE according to the joint modulation information, wherein the command indicates at least one CLI strategy for the at least one UE.
[0162] Additional Notes
[0163] The herein-described subject matter sometimes illustrates different components contained within, or connected with, different other components. It is to be understood that such depicted architectures are merely examples, and that in fact many other architectures can be implemented which achieve the same functionality. In a conceptual sense, any arrangement of components to achieve the same functionality is effectively "associated" such that the desired functionality is achieved. Hence, any two components herein combined to achieve a particular functionality can be seen as "associated with" each other such that the desired functionality is achieved, irrespective of architectures or intermedial components. Likewise, any two components so associated can also be viewed as being "operably connected" , or "operably coupled" , to each other to achieve the desired functionality, and any two components capable of being so associated can also be viewed as being "operably couplable" , to each other to achieve the desired functionality. Specific examples of operably couplable include but are not limited to physically mateable and / or physically interacting components and / or wirelessly interactable and / or wirelessly interacting components and / or logically interacting and / or logically interactable components.
[0164] Further, with respect to the use of substantially any plural and / or singular terms herein, those having skill in the art can translate from the plural to the singular and / or from the singular to the plural as is appropriate to the context and / or application. The various singular / plural permutations may be expressly set forth herein for sake of clarity.
[0165] Moreover, it will be understood by those skilled in the art that, in general, terms used herein, and especially in the appended claims, e.g., bodies of the appended claims, are generally intended as “open” terms, e.g., the term “including” should be interpreted as “including but not limited to, ” the term “having” should be interpreted as “having at least, ” the term “includes” should be interpreted as “includes but is not limited to, ” etc. It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to implementations containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an, " e.g., “a” and / or “an” should be interpreted to mean “at least one” or “one or more; ” the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should be interpreted to mean at least the recited number, e.g., the bare recitation of "two recitations, " without other modifiers, means at least two recitations, or two or more recitations. Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc. ” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention, e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B, and C together, etc. In those instances where a convention analogous to “at least one of A, B, or C, etc. ” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention, e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B, and C together, etc. It will be further understood by those within the art that virtually any disjunctive word and / or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B. ”
[0166] From the foregoing, it will be appreciated that various implementations of the present disclosure have been described herein for purposes of illustration, and that various modifications may be made without departing from the scope and spirit of the present disclosure. Accordingly, the various implementations disclosed herein are not intended to be limiting, with the true scope and spirit being indicated by the following claims.
Claims
1.A method, comprising:measuring, by a processor of an apparatus, a signal from an aggressor user equipment (UE) to determine precoding matrix indicator (PMI) information or rank indicator (RI) information associated with cross-link interference (CLI) from the aggressor UE; andtransmitting, by the processor, a measurement report with the PMI information or the RI information to a network node.2.The method of Claim 1, wherein the PMI information comprises a recommended PMI or a restricted PMI, wherein the recommended PMI recommends a PMI for the aggressor UE to use, and wherein the restricted PMI recommends a PMI for the aggressor UE not to use.3.The method of Claim 2, further comprising:determining, by the processor, the recommended PMI or the restricted PMI according to a codebook of precoders used by the aggressor UE; andreporting, by the processor, an index of the codebook associated with the recommended PMI or the restricted PMI to the network node.4.The method of Claim 2, further comprising:receiving, by the processor, a plurality of precoded pilots from the aggressor UE;determining, by the processor, a recommended precoded pilot or a restricted precoded pilot according to the precoded pilots; andreporting, by the processor, an index associated with the recommended precoded pilot or the restricted precoded pilot to the network node.5.The method of Claim 2, further comprising:determining, by the processor, the recommended PMI or the restricted PMI according to a codebook of precoders used by the aggressor UE; andreporting, by the processor, a joint index associated with the recommended PMI and a PMI for downlink transmission, or a joint index associated with the restricted PMI and a PMI for downlink transmission to the network node.6.The method of Claim 2, further comprising:receiving, by the processor, a plurality of precoded pilots from the aggressor UE;determining, by the processor, a recommended precoded pilot or a restricted precoded pilot according to the precoded pilots; andreporting, by the processor, a joint index associated with the recommended precoded pilot and a precoded pilot for downlink transmission, or a joint index associated with the restricted precoded pilot and a precoded pilot for downlink transmission to the network node.7.The method of Claim 2, further comprising:receiving, by the processor, broadcast information which indicates at least one PMI associated with the aggressor UE from the network node; anddetermining, by the processor, the recommended PMI or the restricted PMI;reporting, by the processor, a differential PMI to indicate the recommended PMI or the restricted PMI according to the broadcast information.8.The method of Claim 1, wherein the RI information comprises a recommended RI or a restricted RI, wherein the recommended RI recommends a rank for the aggressor UE to use, and the restricted RI recommends a rank for the aggressor UE not to use.9.The method of Claim 1, further comprising:reporting, by the processor, an additional channel quality indicator (CQI) or a delta CQI to indicate an expected gain in an event that the PMI information or the RI information is adopted.10.A method, comprising:receiving, by a processor of an apparatus, a request from a network node for triggering a cross-link interference (CLI) estimation;performing, by the processor, a measurement to estimate a spatial transmit covariance matrix of the apparatus to a victim user equipment (UE) ;determining, by the processor, at least one recommended or restricted precoding matrix indicator (PMI) according to the measurement; andtransmitting, by the processor, the at least one recommended or restricted PMI to the network node.11.The method of Claim 10, wherein the performing of the measurement comprises at least one of the following:computing, by the processor, a receive covariance matrix by listening to a sounding reference signal (SRS) of the victim UE;computing, by the processor, a receive covariance matrix on a received data and a demodulation reference signal (DM-RS) to estimate an uplink transmit covariance matrix; andcomputing, by the processor, a receive and transmit covariance matrix according to adjacent band measurements.12.A method, comprising:obtaining, by a processor of an apparatus, modulation information associated with an aggressor user equipment (UE) from a network node or through a blind detection;measuring, by the processor, a reference signal of the aggressor UE according to the modulation information; andperforming, by the processor, a cross-link interference (CLI) strategy according to the reference signal and the modulation information associated with the aggressor UE, or according to a command from the network node.13.The method of claim 12, wherein the CLI strategy comprises at least of treating a CLI of the aggressor UE as a noise to decode a message for the apparatus, jointly demapping messages for the apparatus and the aggressor UE, and rejecting a CLI of the aggressor UE to decode a message for the apparatus.14.The method of claim 12, further comprising:blindly detecting, by the processor, the modulation information associated with the aggressor UE according to a modulation configuration from the network node.15.The method of claim 12, further comprising:receiving, by the processor, a request from the network node; andtransmitting, by the processor, a recommended modulation for the aggressor UE to the network node according to the request.16.The method of claim 12, further comprising:receiving, by the processor, a request from the network node to request channel state information (CSI) associated with the aggressor UE;measuring, by the processor, a reference signal from the aggressor UE to determine the CSI associated with the aggressor UE; andreporting, by the processor, the CSI associated with the aggressor UE to the network node.17.A method, comprising:obtaining, by a processor of a first network node, sharing information from a second network node;determining, by the processor, a modulation configuration for at least one user equipment (UE) communicating with the first network node according to the sharing information; andtransmitting, by the processor, the modulation configuration to the at least one UE.18.The method of claim 17, wherein the sharing information comprises modulation information associated with an aggressor UE communicating with the second network node.19.The method of claim 18, further comprising:transmitting, by the processor, the modulation information associated with the aggressor UE to the at least one UE.20.The method of claim 18, further comprising:transmitting, by the processor, a request to the at least one UE to request a recommended modulation for the aggressor UE;receiving, by the processor, the recommended modulation from the at least one UE;transmitting, by the processor, the recommended modulation to the second network node;receiving, by the processor, the modulation information associated with the aggressor UE from the second network node; andtransmitting, by the processor, the modulation information associated with the aggressor UE to the at least one UE.21.The method of claim 17, wherein the sharing information comprises joint modulation information associated the at least one UE and an aggressor UE communicating with the second network node.22.The method of claim 21, further comprising:transmitting, by the processor, a request to the at least one UE to request channel state information (CSI) associated with the aggressor UE;receiving, by the processor, the CSI associated with the aggressor UE from the at least one UE;determining, by the processor, the joint modulation information according to the CSI associated with the aggressor UE;determining, by the processor, modulation information associated with the aggressor UE according to the joint modulation information;transmitting, by the processor, the modulation information associated with the aggressor UE to the at least one UE; andtransmitting, by the processor, a command to the at least one UE according to the joint modulation information, wherein the command indicates at least one cross-link interference (CLI) strategy for the at least one UE.
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