WO2020211933A1

WO2020211933A1 - Cross link interference measurement procedure for telecommunications systems

Info

Publication number: WO2020211933A1
Application number: PCT/EP2019/059885
Authority: WO
Inventors: Benny Vejlgaard; Klaus Ingemann Pedersen; Nuno Manuel KIILERICH PRATAS; Oana-Elena Barbu; Johannes Harrebek
Original assignee: Nokia Technologies Oy
Priority date: 2019-04-17
Filing date: 2019-04-17
Publication date: 2020-10-22

Abstract

In accordance with some example embodiments, an apparatus may comprise at least one processor and at least one memory including computer program code, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to receive, from a network entity, at least one indication configured to cause the apparatus to perform at least one cross link interference (CLI) measurement. The at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to perform at least one received signal strength indicator CLI measurement. The at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to perform at least one reference signal received power CLI measurement.

Description

TITLE:

CROSS LINK INTERFERENCE MEASUREMENT PROCEDURE FOR TELECOMMUNICATIONS SYSTEMS

BACKGROUND:

Field:

[0001] Certain example embodiments may relate to communication systems. For example, some example embodiments may relate to cross link interference measurements.

Description of the Related Art:

[0002] Fifth-generation new radio (5G NR) is primarily designed to operate in a time-division duplexing (TDD) mode with an enhanced flexibility for link direction switching on a per cell basis, allowing dynamic switching capabilities between uplink and downlink transmission directions. Such capabilities allow flexibility in adapting to particular uplink and downlink traffic, yet may be vulnerable to cross link interference (CLI). Such CLI may be the result of interference between a transmitting network entity (NE) and a receiving NE, and/or between a transmitting interfering user equipment (UE) and a victim UE receiving on the same resources.

SUMMARY:

[0003] In accordance with some example embodiments, a method may include receiving, by a user equipment, from a network entity, at least one indication configured to cause the user equipment to perform at least one CLI measurement. The method may further include performing, by the user equipment, at least one RSSI CLI measurement. The method may further include performing, by the user equipment, at least one RSRP CLI measurement. [0004] In accordance with some example embodiments, an apparatus may include means for receiving, from a network entity, at least one indication configured to cause the apparatus to perform at least one CLI measurement. The apparatus may further include means for performing at least one RSSI CLI measurement. The apparatus may further include means for performing at least one RSRP CLI measurement.

[0005] In accordance with some example embodiments, an apparatus may include at least one processor and at least one memory including computer program code. The at least one memory and the computer program code can be configured to, with the at least one processor, cause the apparatus to at least receive, from a network entity, at least one indication configured to cause the apparatus to perform at least one CLI measurement. The at least one memory and the computer program code can be further configured to, with the at least one processor, cause the apparatus to at least perform at least one RSSI CLI measurement. The at least one memory and the computer program code can be further configured to, with the at least one processor, cause the apparatus to at least perform at least one RSRP CLI measurement.

[0006] In accordance with some example embodiments, a non-transitory computer readable medium can be encoded with instmctions that may, when executed in hardware, perform a method. The method may include receiving, at least one indication configured to perform at least one CLI measurement. The method may further include performing at least one RSSI CLI measurement. The method may further include performing at least one RSRP CLI measurement.

[0007] In accordance with some example embodiments, a computer program product may perform a method. The method may include receiving, from a network entity, at least one indication configured to cause performance of at least one CLI measurement. The method may further include performing at least one RSSI CLI measurement. The method may further include performing at least one RSRP CLI measurement.

[0008] In accordance with some example embodiments, an apparatus may include circuitry configured to receive, from a network entity, at least one indication configured to cause performance of at least one CLI measurement. The circuitry may further perform at least one RSSI CLI measurement. The circuitry may further perform at least one RSRP CLI measurement.

[0009] In accordance with some example embodiments, a method may include transmitting, by a network entity, at least one indication for a user equipment to report at least one first CLI measurement to the network entity. The method may further include transmitting, by the network entity, at least one request to the UE to perform at least one RSRP -based CLI measurement. The method may further include receiving, by the network entity, at least one indication of the results of the at least one RSRP-based CLI measurement from the user equipment.

[0010] In accordance with some example embodiments, an apparatus may include means for transmitting at least one indication for a user equipment to report at least one first CLI measurement to the apparatus. The apparatus may further include means for transmitting at least one request to the user equipment to perform at least one RSRP-based CLI measurement. The apparatus may further include means for receiving at least one indication of the results of the at least one RSRP-based CLI measurement from the user equipment.

[0011] In accordance with some example embodiments, an apparatus may include at least one processor and at least one memory including computer program code. The at least one memory and the computer program code can be configured to, with the at least one processor, cause the apparatus to at least transmit at least one indication for a user equipment to report at least one first CLI measurement to the apparatus. The at least one memory and the computer program code can be further configured to, with the at least one processor, cause the apparatus to at least transmit at least one request to the user equipment to perform at least one RSRP-based CLI measurement. The at least one memory and the computer program code can be further configured to, with the at least one processor, cause the apparatus to at least receive at least one indication of the results of the at least one RSRP-based CLI measurement from the user equipment.

[0012] In accordance with some example embodiments, a non-transitory computer readable medium can be encoded with instmctions that may, when executed in hardware, perform a method. The method may include transmitting at least one indication for a user equipment to report at least one first CLI measurement. The method may further include transmitting at least one request to the UE to perform at least one RSRP-based CLI measurement. The method may further include receiving at least one indication of the results of the at least one RSRP-based CLI measurement from the user equipment.

[0013] In accordance with some example embodiments, a computer program product may perform a method. The method may include transmitting at least one indication for a user equipment to report at least one first CLI measurement. The method may further include transmitting at least one request to the UE to perform at least one RSRP-based CLI measurement. The method may further include receiving at least one indication of the results of the at least one RSRP- based CLI measurement from the user equipment.

[0014] In accordance with some example embodiments, an apparatus may include circuitry configured to transmit at least one indication for a user equipment to report at least one first CLI measurement to the apparatus. The circuitry may further transmit at least one request to the user equipment to perform at least one RSRP-based CLI measurement. The circuitry may further receive at least one indication of the results of the at least one RSRP-based CLI measurement from the user equipment.

BRIEF DESCRIPTION OF THE DRAWINGS: [0015] For proper understanding of this disclosure, reference should be made to the accompanying drawings, wherein:

[0016] FIG. 1 illustrates an example of CLI according to certain example embodiments.

[0017] FIG. 2 illustrates an example of interference classifications based on respective link directions according to certain example embodiments.

[0018] FIG. 3 illustrates an example of a signaling diagram according to certain example embodiments.

[0019] FIG. 4 illustrates two types of RSSI-based CLI measurements according to certain example embodiments.

[0020] FIG. 5 illustrates an example of a method performed by a user equipment according to certain example embodiments.

[0021] FIG. 6 illustrates an example of a method performed by a network entity according to certain example embodiments.

[0022] FIG. 7 illustrates an example of a system according to certain example embodiments.

DETAILED DESCRIPTION:

[0023] As noted above, 5G NR improves flexibility of link direction switching on a per cell basis; however, this may be associated with undesirable CLI. For example, when a source causes new instances of CLI, a victim UE served by a serving NE may not measure CLI based on reference signal received power (RSRP) since the victim UE lacks information on the CLI source, such as the identity and sounding reference signal (SRS) reference symbols of the CLI source. There may be a significant time required for the serving NE to obtain the SRS reference symbols of the CLI source, as well as to request the victim UE to perform RSRP -based CLI measurements. Thus, victim UE reception may be impaired from the beginning of the CLI until the RSRP -based CLI measurements are performed. FIG.1 illustrates an example of CLI with two omnidirectional NE communicating with two UE. UE2, as the victim UE, is in downlink (DL) mode with its serving NE, yet is interfered with by the uplink of UE1, the interfering UE and served by a neighboring NE.

[0024] 3rd generation partnership project new radio (3GPP NR) assumes time synchronicity between multiple NEs such that radio frame and subframe boundaries are fully aligned. The NEs may have varying link directions, adjusted either on a subframe, slot, or intra-slot resolution. The adjustment of link direction may be conducted on a radio frame configuration basis, such as 10ms, on a resolution by dynamically selecting a next slot format. For NR, a slot may be defined as 14 symbols with a normal cyclic prefix (CP), or 12 symbols with an extended CP. Thus, the slot length may depend upon the sub-carrier spacing (SCS), with 1ms for 15kHz SCS; 0.5ms for 30kHz; 0.25ms for 60kHz SCS, etc. 3GPP NR Release- 15 currently defines 56 slot formats, including downlink-only slots, uplink-only slots, and mixed-use slots. FIG. 2 describes the types of interference which may be experienced by a UE based on the link directions of the UE and a neighboring UE.

[0025] 3GPP may also include various features associated with SRS-RSRP, whereby a linear average of the power contributions of the SRS are to be measured over configured resource elements within a considered measurement frequency bandwidth in the time resources in the configured measurement occasion. In addition, the number of SRS to be monitored by the UE may not exceed 8 within a particular slot; however, the network may configure more than 8 SRSs across different slots. As an example, the total number of SRSs to be monitored by a UE may not exceed 32. Furthermore, the UE may not be required to perform time tracking and/or time adjustment beyond a constant offset relative to its own DL timing in order to perform SRS-RSRP measurements. The UE may also not be required to measure SRS using different subcarrier spacing (SCS) compared to the downlink active bandwidth part (BWP) SCS of the same carrier. L3 measurement reporting may also be applied. [0026] With respect to RSSI, 3GPP may include the linear average of the total received power to be observed only in certain orthogonal frequency-division multiplexing (OFDM) symbols of measurement time resources, in the measurement bandwidth, over the configured resource elements for measurement by the UE. As with SRS-RSRP, L3 measurement reporting may be applied.

[0027] There remain no known techniques for reporting events for UE CLI measurements, as well as whether SRS-RSRP and CLI-RSSI measurement reports may be configured together for a UE. As noted above, an interfering UE in uplink mode may dynamically cause CLI at a victim UE in downlink mode when using the same physical resource. This may occur when a neighbor cell UE transitions from a radio resource control (RRC) idle mode to an RRC connected mode. The victim UE may then experience an environment with little to no CLI when changing to an environment with significant CLI without prior warning.

[0028] When CLI occurs from a new source, the victim UE may be unable to measure CLI based on RSRP since the victim UE lacks information on the interfering UE, such as SRS reference symbols. A significant amount of time may be required for the NE serving the victim UE to obtain the SRS reference symbols and to request the victim UE to measure CLI based upon RSRP, which requires SRS. As a result, the victim UE reception maybe significantly impaired from the time that the CLI begins to the first measurements of RSRP. Thus, a need exists to enable early CLI measurements as a technique for addressing new sources of CLI.

[0029] Certain example embodiments described herein may have various benefits and/or advantages. For example, some example embodiments may provide early CLI detection and measurements by avoiding delays in waiting for a NE to provide SRS information for an interfering UE. Furthermore, early CLI detection may be more precise by the addition of UEPRB-RSSI and/or PSD measurements. In addition, while RSSI measurements are associated with a combined source of interference, such as total desired and interference energy, from all sources, RSRP measurements include interference energy from only a specific source, such as an interfering UE. As a result, RSRP measurements allow a NE to make optimal scheduling options for all UE in the cell. Thus, certain example embodiments are directed to improvements in computer-related technology, specifically, by conserving network resources and reducing power consumption of network entities and/or user equipment located within the network.

[0030] FIG. 3 illustrates an example of a signaling diagram showing communications between NE 320, UE 330, UE 340, and NE 350. UE 330 and UE 340 may be similar to UE 710, and NE 320 and NE 350 may be similar to NE 720, both illustrated in FIG. 7.

[0031] In step 301, NE 350 may transmit to UE 340 at least one indication for UE 340 to report at least one first CLI measurement to NE 350. In certain example embodiments, the at least one first CLI measurement may be associated with one or more of at least one CLI-RSSI, at least one user equipment physical resource block (UEPRB)-RSSI, and at least one power spectral density (PSD). UE 340 may be receiving a downlink signal. The at least one indication may also provide at least one indication of the frequency of the at least one first CLI measurement, and/or whether the at least one first measurement should occur in response to at least one event.

[0032] In some example embodiments, NE 350 may transmit at least one MeasConfig information element (IE) to UE 340, for example, as part of at least one RRC reconfiguration and/or RRC resume message. The at least one IE may be denoted as Preemptive-CLI-MeasConfig, which may include the following:

_

The at least one IE may use at least one prefix, such as Preemptive, which may be configured to distinguish the at least one first measurement from existing CLI measurements associated with the SRS of UE 330. Furthermore, UE 340 may be directed to monitor for CLI-RSSI and/or UEPRB-RSSI.

[0033] In step 303, upon receiving the at least one indication in step 301, UE 340 may detect CLI exceeding at least one threshold. In some example embodiments, the CLI may be due to a neighboring UE, such as UE 330, which may be using at least one same physical resource for uplink and downlink as UE 340. UE 330 may be transferring from RRC idle mode to RRC connected mode. UE 340 may detect CLI associated with reception performance according to at least one UE key performance indicator, such as a channel quality indicator (CQI), and/or a RSRQ from at least one link with NE 350.

[0034] In step 305, UE 340 may perform at least one RSSI-based CLI measurement. UE 340 may not have information associated with UE 330, such as at least one SRS symbol and/or at least one DMRS symbol. For example, the CLI-RSSI may be defined as a measurement associated with the received power within the RRC configured UE bandwidth, such as BW RRC. In addition, the UEPRB-RSSI may be defined as a measurement associated with the received power within the B W of the UE scheduled resource elements, such as BW PRB, which may be associated with a subset of the RRC configured UE BW. FIG. 4 illustrates an example of the difference between a defined RSSI-measurement in a configured UE BW and a defined RSSI-measurement in a BW of a UE- scheduled PRB.

[0035] In certain example embodiments, UE 340 may be configured to measure PSD over at least one measurement bandwidth. The flatness of the profile in combination with serving cell RSRP measurements, which may indicate at least one baseline level of power from NE 350, may indicate the presence and/or location of CLI, such as UE 330. Additionally and/or alternatively, by using the at least one UEPRB-RSSI and/or at least one CLI-RSSI, UE 340 may be configured to distinguish CLI, such as interference from the neighboring UE, from co-channel interference, such as interference generated by NE 320 due to wideband transmissions, as opposed to inter-UE CLI, such as interference from UE 330 onto UE 340.

[0036] In step 307, UE 340 may transmit the at least one measured RSSI-based CLI measurement to NE 350, which may be at least one indication of at least one CLI event and/or at least one measurement value. The at least one measured RSSI-based CLI measurement may be transmitted in response to at least one reporting criterion, such as at least one threshold being satisfied. Additionally or alternatively, the at least one measured RSSI-based CLI measurement may be reported according to at least one reporting format.

[0037] In step 309, in response to receiving the at least one measured RSSI- based CLI measurement, NE 350 may request SRS information from NE 320 with at least one Xn interface. In step 31 1, NE 350 may transmit at least one request to UE 340 to perform at least one RSRP-based CLI measurement, and in step 313, UE 340 may perform the at least one RSRP-based CLI measurement. In step 315, UE 340 may transmit at least one indication of the results of the at least one RSRP-based CLI measurement to NE 350.

[0038] FIG. 5 illustrates an example of a method performed by a user equipment, such as UE 710 in FIG. 7. In step 501, the UE may receive from a NE, such as NE 720 in FIG. 7, at least one indication configured to cause the UE to perform at least one first CLI measurement. In certain example embodiments, the at least one first CLI measurement may be associated with one or more of at least one CLI-RSSI, at least one UE physical resource block (UEPRB)-RSSI, and at least one PSD. The UE may be receiving a downlink signal. The at least one first indication may also provide at least one indication of the frequency of the at least one first CLI measurement, and/or whether the at least one first measurement should occur in response to at least one event.

[0039] In some example embodiments, the UE may receive at least one MeasConfig IE from the NE, for example, as part of at least one RRC reconfiguration and/or RRC resume message. The at least one IE may be denoted as Preemptive-CLI-MeasConfig, which may include the following:

The at least one IE may use at least one prefix, such as Preemptive, which may be configured to distinguish the at least one first measurement from existing CLI measurements associated with the SRS of the UE. Furthermore, the UE may be directed to monitor for CLI-RSSI and/or UEPRB-RSSI.

[0040] In step 503, the UE may detect CLI exceeding at least one predefined threshold. In some example embodiments, the CLI may be due to a neighboring UE, such as UE 710 in FIG. 7, using at least one same physical resource for uplink and downlink as the UE. The neighboring UE may be transferring from RRC idle mode to RRC connected mode. The UE may detect CLI associated with reception performance according to at least one UE key performance indicator, such as CQI, and/or a RSRQ from at least one link with the NE.

[0041] In step 505, the UE may perform at least one RSSI CLI measurement. The UE may not have information associated with the neighboring UE, such as at least one SRS symbol and/or at least one DMRS symbol. For example, the CLI-RSSI may be defined as a measurement associated with the received power within the RRC configured UE bandwidth, such as BW RRC. In addition, the UEPRB-RSSI may be defined as a measurement associated with the received power within the B W of the UE scheduled resource elements, such as B W PRB, which may be associated with a subset of the RRC configured UE BW. FIG. 4 illustrates an example of the difference between a defined RSSI-measurement in a configured UE BW and a defined RSSI-measurement in a BW of a UE- scheduled PRB.

[0042] In certain example embodiments, the UE may be configured to measure PSD over at least one measurement bandwidth. The flatness of the profile in combination with serving cell RSRP measurements, which may indicate at least one baseline level of power from the serving NE, may indicate the presence and/or location of CLI, such as the neighboring UE. Additionally and/or alternatively, by using the at least one UEPRB-RSSI and/or at least one CLI- RSSI, the UE may be configured to distinguish CLI, such as interference from the neighboring UE, from co-channel interference, such as interference generated from the neighboring NE due to wideband transmissions, as opposed to inter-UE CLI, such as interference from the neighboring UE onto the UE.

[0043] In step 507, the UE may transmit at least one result associated with the at least one RSSI CLI measurement to the network entity, which may be at least one indication of at least one CLI event and/or at least one measurement value. The at least one measured RSSI-based CLI measurement may be transmitted in response to at least one reporting criterion, such as at least one threshold being satisfied. Additionally or alternatively, the at least one measured RSSI-based CLI measurement may be reported according to at least one reporting format.

[0044] In step 509, the UE may receive at least one request from the NE to perform at least one RSRP CLI measurement. In step 51 1, the UE may perform at least one RSRP CLI measurement. In step 513, the UE may transmit at least one result associated with the at least one RSRP CLI measurement to the NE.

[0045] FIG. 6 illustrates an example of a method performed by a NE, such as network entity 720 in FIG. 7. In step 601 , the NE may transmit to a UE, such as UE 710 in FIG. 7, at least one indication for the UE to report at least one first CLI measurement to the NE. In certain example embodiments, the at least one first CLI measurement may be associated with one or more of at least one CLI- RSSI, at least one UEPRB-RSSI, and at least one PSD. The at least one indication may also provide at least one indication of the frequency of the at least one first CLI measurement, and/or whether the at least one first measurement should occur in response to at least one event.

[0046] In some example embodiments, the NE may transmit at least one MeasConfig IE to the UE, for example, as part of at least one RRC reconfiguration and/or RRC resume message. The at least one IE may be denoted as Preemptive-CLI-MeasConfig, which may include the following:

[0047] The at least one IE may use at least one prefix, such as Preemptive, which may be configured to distinguish the at least one first measurement from existing CLI measurements associated with the SRS of a neighbouring UE. Furthermore, the UE may be directed to monitor for CLI-RSSI and/or UEPRB-RSSI.

[0048] In step 603, the NE may receive at least one measured RSSI-based CLI measurement from the UE, which may be at least one indication of at least one CLI event and/or at least one measurement value. The at least one RSSI-based CLI measurement may be associated with at least one additional measurements. For example, the CLI-RSSI may be defined as a measurement associated with the received power within the RRC configured UE bandwidth, such as BW RRC. In addition, the UEPRB-RSSI may be defined as a measurement associated with the received power within the BW of the UE scheduled resource elements, such as BW PRB, which may be associated with a subset of the RRC configured UE BW. In addition, the at least one RSSI-based CLI measurement may be associated with at least one measurement of PSD over at least one measurement bandwidth. The flatness of the profile in combination with serving cell RSRP measurements, which may indicate at least one baseline level of power from the serving NE, may indicate the presence and/or location of CLI, such as the neighboring UE. Additionally and/or alternatively, by using the at least one UEPRB-RSSI and/or at least one CLI-RSSI, the at least one RSSI- based CLI measurement may be configured to distinguish CLI, such as interference from the neighboring UE, from co-channel interference, such as interference generated from the neighboring NE due to wideband transmissions, as opposed to inter-UE CLI, such as interference from the neighboring UE onto the UE.

[0049] The at least one measured RSSI-based CLI measurement may be received in response to at least one reporting criterion, such as at least one threshold being satisfied. Additionally or alternatively, the at least one measured RSSI-based CLI measurement may be reported according to at least one reporting format.

[0050] In step 605, the NE may transmit at least one request for SRS information to a neighboring NE with at least one Xn interface. In step 607, the NE may transmit at least one request to the UE to perform at least one RSRP-based CLI measurement. In step 609, the NE may receive at least one indication of the results of the at least one RSRP-based CLI measurement from the UE.

[0051] FIG. 7 illustrates an example of a system according to certain example embodiments. In one example embodiment, a system may include multiple devices, such as, for example, UE 710 and/or NE 720.

[0052] UE 710 may include one or more of a mobile device, such as a mobile phone, smart phone, personal digital assistant (PDA), tablet, or portable media player, digital camera, pocket video camera, video game console, navigation unit, such as a global positioning system (GPS) device, desktop or laptop computer, single-location device, such as a sensor or smart meter, or any combination thereof.

[0053] NE 720 may be one or more of a base station, such as an evolved node B (eNB) or 5G or New Radio node B (gNB), a serving gateway, a server, and/or any other access node or combination thereof. Furthermore, UE 710 and/or NE 720 may be one or more of a citizens broadband radio service device (CBSD).

[0054] One or more of these devices may include at least one processor, respectively indicated as 711 and 721. Processors 71 1 and 721 may be embodied by any computational or data processing device, such as a central processing unit (CPU), application specific integrated circuit (ASIC), or comparable device. The processors may be implemented as a single controller, or a plurality of controllers or processors.

[0055] At least one memory may be provided in one or more of devices indicated at 712 and 722. The memory may be fixed or removable. The memory may include computer program instmctions or computer code contained therein. Memories 712 and 722 may independently be any suitable storage device, such as a non-transitory computer-readable medium. A hard disk drive (HDD), random access memory (RAM), flash memory, or other suitable memory may be used. The memories may be combined on a single integrated circuit as the processor, or may be separate from the one or more processors. Furthermore, the computer program instmctions stored in the memory and which may be processed by the processors may be any suitable form of computer program code, for example, a compiled or interpreted computer program written in any suitable programming language. Memory may be removable or non-removable.

[0056] Processors 71 1 and 721 and memories 712 and 722 or a subset thereof, may be configured to provide means corresponding to the various blocks of FIGS. 3-6. Although not shown, the devices may also include positioning hardware, such as GPS or micro electrical mechanical system (MEMS) hardware, which may be used to determine a location of the device. Other sensors are also permitted and may be included to determine location, elevation, orientation, and so forth, such as barometers, compasses, and the like.

[0057] As shown in FIG. 7, transceivers 713 and 723 may be provided, and one or more devices may also include at least one antenna, respectively illustrated as 714 and 724. The device may have many antennas, such as an array of antennas configured for multiple input multiple output (MIMO) communications, or multiple antennas for multiple radio access technologies. Other configurations of these devices, for example, may be provided. Transceivers 713 and 723 may be a transmitter, a receiver, or both a transmitter and a receiver, or a unit or device that may be configured both for transmission and reception.

[0058] The memory and the computer program instmctions may be configured, with the processor for the particular device, to cause a hardware apparatus such as user equipment to perform any of the processes described below (see, for example, FIGS. 1-6). Therefore, in certain example embodiments, a non-transitory computer-readable medium may be encoded with computer instructions that, when executed in hardware, perform a process such as one of the processes described herein. Alternatively, certain example embodiments may be performed entirely in hardware.

[0059] In certain example embodiments, an apparatus may include circuitry configured to perform any of the processes or functions illustrated in FIGS. 1-6. For example, circuitry may be hardware-only circuit implementations, such as analog and/or digital circuitry. In another example, circuitry may be a combination of hardware circuits and software, such as a combination of analog and/or digital hardware circuit(s) with software or firmware, and/or any portions of hardware processor(s) with software (including digital signal processor(s)), software, and at least one memory that work together to cause an apparatus to perform various processes or functions. In yet another example, circuitry may be hardware circuit(s) and or processor(s), such as a microprocessor(s) or a portion of a microprocessor(s), that include software, such as firmware for operation. Software in circuitry may not be present when it is not needed for the operation of the hardware.

[0060] The features, structures, or characteristics of certain example embodiments described throughout this specification may be combined in any suitable manner in one or more example embodiments. For example, the usage of the phrases“certain example embodiments,”“some example embodiments,” “other example embodiments,” or other similar language, throughout this specification refers to the fact that a particular feature, structure, or characteristic described in connection with the example embodiment may be included in at least one example embodiment of the present invention. Thus, appearance of the phrases“in certain example embodiments,”“in some example embodiments,” “in other example embodiments,” or other similar language, throughout this specification does not necessarily refer to the same group of example embodiments, and the described features, structures, or characteristics may be combined in any suitable manner in one or more example embodiments.

[0061] One having ordinary skill in the art will readily understand that certain example embodiments discussed above may be practiced with steps in a different order, and/or with hardware elements in configurations which are different than those which are disclosed. Therefore, it would be apparent to those of skill in the art that certain modifications, variations, and alternative constructions would be apparent, while remaining within the spirit and scope of the invention. In order to determine the metes and bounds of the invention, therefore, reference should be made to the appended claims.

[0062] Partial Glossary

[0063] 3 GPP 3rd Generation Partnership Project

[0064] 5G 5th Generation Wireless System

[0065] BWP Bandwidth Part

[0066] CLI Cross Link Interference

[0067] CP Cyclic Prefix

[0068] CQI Channel Quality Indicator

[0069] DMRS Demodulation Reference Signal

[0070] gNB 5G Base Station

[0071] GPS Global Positioning System

[0072] IE Information Element

[0073] NE Network Entity

[0074] NR New Radio

[0075] OFDM Orthogonal Frequency-Division Multiplexing

[0076] PUSCH Physical Uplink Shared Channel

[0077] RRC Radio Resource Control

[0078] PRB Physical Resource Block [0079] PSD Power Spectral Density

[0080] RRC Radio Resource Control

[0081] RSRP Reference Signal Received Power

[0082] RSRQ Reference Signal Received Quality

[0083] RSSI Received Signal Strength Indicator

[0084] SCS Sub-Carrier Spacing

[0085] SRS Sounding Reference Signal

[0086] TDD Time-Division Duplexing

[0087] UE User Equipment

[0088] UEPRB User Equipment Physical Resource Block

[0089] UL Uplink

[0090] URLLC Ultra-reliable Low Latency Communication

[0091] RRC Radio Resource Control

Claims

WE CLAIM:

1. An apparatus, comprising:

at least one processor; and

at least one memory including computer program code,

wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to:

receive, from a network entity, at least one indication configured to cause the apparatus to perform at least one cross link interference (CLI) measurement; perform at least one received signal strength indicator (RSSI) CLI measurement; and

perform at least one reference signal received power (RSRP) CLI measurement.

2. The apparatus according to claim 1, wherein the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to:

detect CLI exceeding at least one predefined threshold.

3. The apparatus according to any of claims 1 or 2, wherein the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to:

transmit at least one result associated with the at least one RSSI CLI measurement to the network entity.

4. The apparatus according to any of claims 1-3, wherein the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to:

receive at least one request from the network entity to perform at least one RSRP CLI measurement.

5. The apparatus according to any of claims 1-4, wherein the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to:

transmit at least one result associated with the at least one RSRP CLI measurement.

6. The apparatus according to any of claims 1-5, wherein the at least one first CLI measurement is associated with one or more of at least one CLI-RSSI, at least one user equipment physical resource block (UEPRB)-RSSI, and at least one power spectral density.

7. The apparatus according to any of claims 1-6, wherein the apparatus is receiving a downlink signal.

8. The apparatus according to any of claims 1-7, wherein the at least one indication comprises at least one indication of the frequency of the at least one first CLI measurement, and/or whether the at least one first measurement should occur in response to at least one event.

9. The apparatus according to any of claims 1-8, wherein the detected CLI is associated with a neighboring user equipment that is using the same physical resource for uplink and downlink as the apparatus.

10. The apparatus according to any of claims 1-9, wherein the neighboring user equipment is transferring from radio resource control (RRC) idle mode to RRC connected mode.

11. The apparatus according to any of claims 1-10, where the detected CLI is associated with reception performance according to at least one UE key performance indicator, such as a channel quality indicator (CQI) and/or a reference signal received quality from at least one link with the network entity.

12. The apparatus according to any of claims 1-11, wherein the at least one RSSI-based CLI measurement is associated with one or more of CLI-RSSI and/or UEPRB-RSSI.

13. The apparatus according to any of claims 1-12, wherein the CLI- RSSI is a measurement associated with the received power within the RRC configured UE bandwidth.

14. The apparatus according to any of claims 1-13, wherein the UEPRB- RSSI is a measurement associated with the received power within the bandwidth of the user equipment scheduled resource elements.

15. The apparatus according to any of claims 1-14, wherein the apparatus is configured to measure PSD over at least one measurement bandwidth.

16. The apparatus according to any of claims 1-15, wherein the at least one CLI-RSSI is associated with received power within at least one radio resource control configured user equipment bandwidth, and/or the at least one UEPRB-RSSI is associated with at least one received power within at least one bandwidth of at least one UE scheduled resource element.

17. An apparatus, comprising:

at least one processor; and

at least one memory including computer program code,

transmit at least one indication for a user equipment to report at least one first CLI measurement to the apparatus;

transmit at least one request to the UE to perform at least one RSRP- based CLI measurement; and

receive at least one indication of the results of the at least one RSRP- based CLI measurement from the user equipment.

18. The apparatus according to claim 17, wherein the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to:

receive at least one measured RSSI-based CLI measurement from the user equipment.

19. The apparatus according to any of claims 17 or 18, wherein the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to:

transmit at least one request for sounding reference signal information to a neighboring network entity with at least one Xn interface.

20. The apparatus according to any of claims 17-19, wherein the at least one first CLI measurement is associated with one or more of at least one CLI- RSSI, at least one user equipment physical resource block (UEPRB)-RSSI, and at least one power spectral density (PSD).

21. The apparatus according to any of claims 17-20, wherein the user equipment is receiving a downlink signal.

22. The apparatus according to any of claims 17-21, wherein the at least one indication comprises at least one indication of the frequency of the at least one first CLI measurement, and/or whether the at least one first measurement should occur in response to at least one event.

23. The apparatus according to any of claims 17-22, wherein the detected CLI is associated with a neighboring user equipment that is using the same physical resource for uplink and downlink as the apparatus.

24. The apparatus according to any of claims 17-23, wherein the neighboring user equipment is transferring from RRC idle mode to RRC connected mode.

25. The apparatus according to any of claims 17-24, where the detected CLI is associated with reception performance according to at least one UE key performance indicator, such as a channel quality indicator (CQI) and/or a RSRQ from at least one link with the network entity.

26. The apparatus according to any of claims 17-25, wherein the at least one RSSI-based CLI measurement is associated with one or more of CLI-RSSI and/or UEPRB-RSSI.

27. The apparatus according to any of claims 17-26, wherein the CLI- RSSI is a measurement associated with the received power within the RRC configured UE bandwidth.

28. The apparatus according to any of claims 17-27, wherein the UEPRB-RSSI is a measurement associated with the received power within the bandwidth of the user equipment scheduled resource elements.

29. The apparatus according to any of claims 17-28, wherein the at least one CLI-RSSI is associated with received power within at least one radio resource control configured user equipment bandwidth, and/or the at least one UEPRB-RSSI is associated with at least one received power within at least one bandwidth of at least one UE scheduled resource element.

30. A method, comprising:

receiving, by a user equipment, from a network entity, at least one indication configured to cause the user equipment to perform at least one cross link interference (CLI) measurement;

performing, by the user equipment, at least one received signal strength indicator (RSSI) CLI measurement; and

performing, by the user equipment, at least one reference signal received power (RSRP) CLI measurement.

31. The method according to claim 30, further comprising:

detecting, by the user equipment, CLI exceeding at least one predefined threshold.

32. The method according to any of claims 30 or 31 , further comprising: transmitting, by the user equipment, at least one result associated with the at least one RSSI CLI measurement to the network entity.

33. The method according to any of claims 30-32, further comprising: receiving, by the user equipment, at least one request from the network entity to perform at least one RSRP CLI measurement.

34. The method according to any of claims 30-33, further comprising: transmitting, by the user equipment, at least one result associated with the at least one RSRP CLI measurement.

35. The method according to any of claims 30-34, wherein the at least one first CLI measurement is associated with one or more of at least one CLI- RSSI, at least one user equipment physical resource block (UEPRB)-RSSI, and at least one power spectral density.

36. The method according to any of claims 30-35, wherein the user equipment is receiving a downlink signal.

37. The method according to any of claims 30-36, wherein the at least one indication comprises at least one indication of the frequency of the at least one first CLI measurement, and/or whether the at least one first measurement should occur in response to at least one event.

38. The method according to any of claims 30-37, wherein the detected CLI is associated with a neighboring user equipment that is using the same physical resource for uplink and downlink as the apparatus.

39. The method according to any of claims 30-38, wherein the neighboring user equipment is transferring from radio resource control (RRC) idle mode to RRC connected mode.

40. The method according to any of claims 30-39, where the detected CLI is associated with reception performance according to at least one UE key performance indicator, such as a channel quality indicator (CQI) and/or a reference signal received quality from at least one link with the network entity.

41. The method according to any of claims 30-40, wherein the at least one RSSI-based CLI measurement is associated with one or more of CLI-RSSI and/or UEPRB-RSSI.

42. The method according to any of claims 30-41 , wherein the CLI-RSSI is a measurement associated with the received power within the RRC configured UE bandwidth.

43. The method according to any of claims 30-42, wherein the UEPRB- RSSI is a measurement associated with the received power within the bandwidth of the user equipment scheduled resource elements.

44. The method according to any of claims 30-43, wherein the apparatus is configured to measure PSD over at least one measurement bandwidth.

45. The method according to any of claims 30-44, wherein the at least one CLI-RSSI is associated with received power within at least one radio resource control configured user equipment bandwidth, and/or the at least one UEPRB-RSSI is associated with at least one received power within at least one bandwidth of at least one UE scheduled resource element.

46. A method, comprising:

transmitting, by a network entity, at least one indication for a user equipment to report at least one first CLI measurement to the network entity; transmitting, by the network entity, at least one request to the UE to perform at least one RSRP-based CLI measurement; and

receiving, by the network entity, at least one indication of the results of the at least one RSRP-based CLI measurement from the user equipment.

47. The method according to claim 46, further comprising:

receiving, by the network entity, at least one measured RSSI-based CLI measurement from the user equipment.

48. The method according to any of claims 46 or 47, further comprising: transmitting, by the network entity, at least one request for sounding reference signal information to a neighboring network entity with at least one

Xn interface.

49. The method according to any of claims 46-48, wherein the at least one first CLI measurement is associated with one or more of at least one CLI- RSSI, at least one user equipment physical resource block (UEPRB)-RSSI, and at least one power spectral density (PSD).

50. The method according to any of claims 46-49, wherein the user equipment is receiving a downlink signal.

51. The method according to any of claims 46-50, wherein the at least one indication comprises at least one indication of the frequency of the at least one first CLI measurement, and/or whether the at least one first measurement should occur in response to at least one event.

52. The method according to any of claims 46-51, wherein the detected CLI is associated with a neighboring user equipment that is using the same physical resource for uplink and downlink as the apparatus.

53. The method according to any of claims 46-52, wherein the neighboring user equipment is transferring from RRC idle mode to RRC connected mode.

54. The method according to any of claims 46-53, where the detected CLI is associated with reception performance according to at least one UE key performance indicator, such as a channel quality indicator (CQI) and/or a RSRQ from at least one link with the network entity.

55. The method according to any of claims 46-54, wherein the at least one RSSI-based CLI measurement is associated with one or more of CLI-RSSI and/or UEPRB-RSSI.

56. The method according to any of claims 46-55, wherein the CLI-RSSI is a measurement associated with the received power within the RRC configured UE bandwidth.

57. The method according to any of claims 46-56, wherein the UEPRB- RSSI is a measurement associated with the received power within the bandwidth of the user equipment scheduled resource elements.

58. The method according to any of claims 46-57, wherein the at least one CLI-RSSI is associated with received power within at least one radio resource control configured user equipment bandwidth, and/or the at least one UEPRB-RSSI is associated with at least one received power within at least one bandwidth of at least one UE scheduled resource element.

59. A non-transitory computer-readable medium encoding instructions that, when executed in hardware, perform a process according to any of claims 1-58.

60. An apparatus comprising means for performing a process according to any of claims 1-58.

61. An apparatus comprising circuitry configured to cause the apparatus to perform a process according to any of claims 1-58.

62. A computer program product encoded with instmctions for performing a process according to any of claims 1-58.