WO2021168625A1

WO2021168625A1 - Adaptive measurement of cross link interference

Info

Publication number: WO2021168625A1
Application number: PCT/CN2020/076477
Authority: WO
Inventors: Lei Du; Lars Dalsgaard; Srinivasan Selvaganapathy
Original assignee: Nokia Shanghai Bell Co., Ltd.; Nokia Solutions And Networks Oy; Nokia Technologies Oy
Priority date: 2020-02-24
Filing date: 2020-02-24
Publication date: 2021-09-02
Also published as: CN115176491A

Abstract

Example embodiments of the present disclosure relate to devices, methods and computer readable storage media for active measurement of cross link interference (CLI). In example embodiments, a first device determines an occurrence of transmission associated with a first device on at least a part of a measurement resource for measurement of cross link interference within a measurement period. The first device skips the measurement of cross link interference on at least the part of the measurement resource. The first device sends a measurement result to a second device based on the measurement of cross link interference within at least the measurement period.

Description

ADAPTIVE MEASUREMENT OF CROSS LINK INTERFERENCE

FIELD

Example embodiments of the present disclosure generally relate to the field of communication, and in particular, to devices, methods and computer readable storage media for active measurement of cross link interference (CLI) .

BACKGROUND

The fifth generation (5G) New Radio (NR) allows both Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD) . With TDD, downlink (DL) and uplink (UL) transmission directions are separate in a time domain, but may be multiplexed in a frequency domain. For TDD, 5G NR allows enhanced flexibility for transmission direction switch per cell. For example, DL and UL transmission directions can be dynamically switched in a cell. Accordingly, a UL and DL pattern can be adapted in a cell according to UL and DL traffic.

However, such switch flexibility induces undesirable Cross Link Interference (CLI) . The CLI may occur between network devices such as NR NodeBs (gNBs) and between terminal devices such as User Equipment (UEs) . For example, gNB to gNB (gNB-2-gNB) interference may occur if a gNB is transmitting while another gNB is receiving on the same resources. UE to UE (UE-2-UE) interference may occur if a UE is transmitting while another UE is receiving on the same resources in a neighboring cell.

SUMMARY

In general, example embodiments of the present disclosure provide devices, methods and computer readable storage media for active measurement of cross link interference (CLI) .

In a first aspect, a first device is provided which comprises at least one processor and at least one memory including computer program code. The at least one memory and the computer program code are configured to, with the at least one processor, cause the first device to determine an occurrence of transmission associated with a first device on at least a part of a measurement resource for measurement of cross link interference within a measurement period. The first device is caused to skip the measurement of cross link interference on at least the part of the measurement resource. The first device is further caused to send a measurement result to a second device based on the measurement of cross link interference within at least the measurement period.

In a second aspect, a second device is provided which comprises at least one processor and at least one memory including computer program code. The at least one memory and the computer program code are configured to, with the at least one processor, cause the second device to allocate, in a measurement time interval within a measurement period, at least one measurement resource for measurement of cross link interference by a first device configured with discontinuous reception, at least a starting part of the at least one measurement resource being within inactive time of a discontinuous reception cycle. The second device is further caused to send an indication of the at least one measurement resource to the first device.

In a third aspect, a method is provided. In the method, a first device determines an occurrence of transmission associated with a first device on at least a part of a measurement resource for measurement of cross link interference within a measurement period. The first device skips the measurement of cross link interference on at least the part of the measurement resource. The first device sends a measurement result to a second device based on the measurement of cross link interference within at least the measurement period.

In a fourth aspect, a method is provided. In the method, the second device allocates, in a measurement time interval within a measurement period, at least one measurement resource for measurement of cross link interference by a first device configured with discontinuous reception, at least a starting part of the at least one measurement resource being within inactive time of a discontinuous reception cycle. Further, the second device sends an indication of the at least one measurement resource to the first device.

In a fifth aspect, there is provided an apparatus comprising means for performing the method according to the third or fourth aspect.

In a sixth aspect, there is provided a computer readable storage medium comprising program instructions stored thereon. The instructions, when executed by a processor of an apparatus, cause the apparatus to perform the method according to the third or fourth aspect.

It is to be understood that the summary section is not intended to identify key or essential features of example embodiments of the present disclosure, nor is it intended to be used to limit the scope of the present disclosure. Other features of the present disclosure will become easily comprehensible through the following description.

BRIEF DESCRIPTION OF THE DRAWINGS

Some example embodiments will now be described with reference to the accompanying drawings, where:

FIG. 1 illustrates example CLI between terminal devices;

FIG. 2 illustrates an example environment in which example embodiments of the present disclosure can be implemented;

FIG. 3 illustrates a flowchart of an example method of adaptive CLI measurement according to some example embodiments of the present disclosure;

FIG. 4 illustrates an example process of expending the measurement period according to some example embodiments of the present disclosure;

FIG. 5 illustrates an example process of expending the measurement period according to some other example embodiments of the present disclosure;

FIG. 6 illustrates an example configuration of the CLI measurement according to some example embodiments of the present disclosure;

FIG. 7 illustrates an example process of the CLI measurement according to some example embodiments of the present disclosure;

FIG. 8 illustrates a flowchart of an example method of CLI measurement configuration according to some example embodiments of the present disclosure; and

FIG. 9 is a simplified block diagram of a device that is suitable for implementing example embodiments of the present disclosure.

Throughout the drawings, the same or similar reference numerals represent the same or similar element.

DETAILED DESCRIPTION

Principle of the present disclosure will now be described with reference to some example embodiments. It is to be understood that these example embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. The disclosure described herein can be implemented in various manners other than the ones described below.

In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs.

As used herein, the term “terminal device” or “user equipment” (UE) refers to any terminal device capable of wireless communications with each other or with the base station. The communications may involve transmitting and/or receiving wireless signals using electromagnetic signals, radio waves, infrared signals, and/or other types of signals suitable for conveying information over air. In some example embodiments, the UE may be configured to transmit and/or receive information without direct human interaction. For example, the UE may transmit information to the base station on predetermined schedules, when triggered by an internal or external event, or in response to requests from the network side.

Examples of the UE include, but are not limited to, smart phones, wireless-enabled tablet computers, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , wireless customer-premises equipment (CPE) , sensors, metering devices, personal wearables such as watches, and/or vehicles that are capable of communication. For the purpose of discussion, some example embodiments will be described with reference to UEs as examples of the terminal devices, and the terms “terminal device” and “user equipment” (UE) may be used interchangeably in the context of the present disclosure. The UE may also correspond to Mobile Termination (MT) part of the integrated access and backhaul (IAB) node (a.k.a. a relay node) .

As used herein, the term “network device” refers to a device via which services can be provided to a terminal device in a communication network. As an example, the network device may comprise a base station. As used herein, the term “base station” (BS) refers to a network device via which services can be provided to a terminal device in a communication network. The base station may comprise any suitable device via which a terminal device or UE can access the communication network. Examples of the base stations include a relay, an access point (AP) , a transmission point (TRP) , a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a New Radio (NR) NodeB (gNB) , a Remote Radio Module (RRU) , a radio header (RH) , a remote radio head (RRH) , a low power node such as a femto, a pico, and the like. A relay node may correspond to Distributed Unit (DU) part of the IAB node.

As used herein, the term “circuitry” may refer to one or more or all of the following:

(a) hardware-only circuit implementations (such as implementations in only analog and/or digital circuitry) and

(b) combinations of hardware circuits and software, such as (as applicable) : (i) a combination of analog and/or digital hardware circuit (s) with software/firmware and (ii) any portions of hardware processor (s) with software (including digital signal processor (s) ) , software, and memory (ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and

(c) hardware circuit (s) and or processor (s) , such as a microprocessor (s) or a portion of a microprocessor (s) , that requires software (e.g., firmware) for operation, but the software may not be present when it is not needed for operation.

This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware. The term circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in a server, a cellular base station, or other computing or base station.

As used herein, the singular forms “a” , “an” , and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term “includes” and its variants are to be read as open terms that mean “includes, but is not limited to” . The term “based on” is to be read as “based at least in part on” . The term “one embodiment” and “an embodiment” are to be read as “at least one embodiment” . The term “another embodiment” is to be read as “at least one other embodiment” . Other definitions, explicit and implicit, may be included below.

As used herein, the terms “first” , “second” and the like may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be referred to as a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term “and/or” includes any and all combinations of one or more of the listed terms.

In 5G NR, dynamic switch is allowed in a cell between uplink and downlink transmission directions. However, such flexibility of switch per cell introduces potential cross link interference (CLI) between gNBs and UEs. For example, a transmitting gNB may interfere with another gNB that is receiving on the same resources at the same time. A UE that is transmitting in a cell may interfere with another UE that is receiving in a neighboring cell on the same resources at the same time. The transmitting gNB or UE may be considered as an aggressor, and the receiving gNB or UE may be considered as a victim.

FIG. 1 shows example UE-2-UE interference 100. As shown, a UE 105 is served by a gNB or cell 110, and a UE 115 is served by a gNB or cell 120. The two

UEs

105 and 115 may be close to each other or may not be close by but still cause CLI due to propagation characteristics. In this case, If the UE 105 is transmitting to the cell 110 while the UE 115 is receiving from the cell 120, the UL transmission of the UE 105 may interfere with the DL transmission of the UE 115.

Some CLI measurement requirements are specified for a UE in terms of measurement capability, measurement time/delay and measurement accuracy. The CLI measurement may involve the measurement with respect to Received Signal Strength Indication (RSSI) such as CLI-RSSI and/or Reference Signal Received Power (RSRP) such as CLI-RSRP. For the CLI-RSRP measurement, a UE may measure RSRP of a sounding reference signal (SRS) from an aggressor UE, which is also called SRS-RSRP.

Scheduling restrictions for SRS-RSRP are defined in 3GPP TS 38.133 as below.

Based on the scheduling restrictions, the UE is not expected to be scheduled on Orthogonal Frequency Division Multiplexing (OFDM) symbols on which the UE performs CLI measurement and on one to two symbols prior to the OFDM symbols for the CLI measurement.

Recently, frequency division multiplexing (FDM) of scheduled DL transmission and CLI measurements is allowed in 3GPP. For example, a Physical Downlink Shared Channel (PDSCH) /Physical Downlink Control Channel (PDCCH) can be scheduled on the OFDM symbols that are allocated to a UE for SRS-RSRP and/or CLI RSSI measurement. If the UE cannot support reception in a FDM manner, the scheduled DL transmission may conflict with the CLI measurement at the UE. For conflict resolution, it is agreed that the UE should prioritize the DL scheduled transmission over the SRS-RSRP/CLI RSSI on the SRS-RSRP/CLI RSSI resources. However, there is no design for the implementation of the CLI measurement in this situation.

In one aspect, example embodiments of the present disclosure propose an adaptive measurement scheme for cross link interference (CLI) . With this measurement scheme, if transmission and CLI measurement conflicts with each other at a device (such as a UE) on at least a part of a measurement resource within a measurement period, the CLI measurement will be skipped on at least the part of the measurement resource. The collision between the transmission and the CLI measurement will occur when the transmission is to be performed on the measurement resource. Since the CLI measurement is skipped due to the collision, at least the part of the measurement resource is not used by the device to measure the CLI within the measurement period. In some example embodiments, at the end of the measurement period, the device may report that a measurement requirement such as the number of measurements or measurement accuracy is inapplicable to the measurement report, or the measurement report is invalid. In some other example embodiments, the device may extend the measurement period to obtain more CLI measurement opportunities so as to fulfill the measurement requirement. Based on the CLI measurement having been performed, the device may send a measurement result to a further device such as a gNB. Either the measurement report with a qualified CLI measurement result, or the measurement report with an indication that the measurement accuracy is inapplicable may help the receiving party to know the situation and behavior of the device in the CLI measurement. Accordingly, the receiving party may take the corresponding actions.

In another aspect, some example embodiments of the present disclosure propose a resource allocation scheme to avoid the above collision. The resource allocation scheme provides joint resource configuration of discontinuous reception (DRX) and the CLI measurement. With this scheme, if a device is configured with DRX, at least one measurement resource is allocated to the device in a measurement cycle of a measurement period. At least a starting part of the allocated measurement resource is within inactive time of a discontinuous reception cycle. Since the device is not required to monitor or transmit in the inactive time according to DRX monitoring rules, this resource allocation scheme may avoid the potential collision between scheduled or autonomous transmission and the CLI measurement.

FIG. 2 shows an example environment 200 in which example embodiments of the present disclosure can be implemented.

The environment 200, which may be a part of a communication network, comprises two

devices

210 and 220 communicating with each other, which is referred to as a first device 210 and a second device 220, respectively. The number of devices is shown in FIG. 2 only for the purpose of illustration, without suggesting any limitation. The environment 200 may comprise any suitable number of devices.

The two

devices

210 and 220 may be implemented by any suitable devices. For example, the first device 210 may be implemented by a terminal device such as the

UE

105 or 115 as shown in FIG. 1, and the second device 220 may be implemented by a network device such as the

cell

110 or 120 as shown in FIG. 1. As another example, the two

devices

210 and 220 may be both implemented by terminal devices.

The communication in the environment 200 may follow any suitable communication standards or protocols, which are already in existence or to be developed in the future, such as Universal Mobile Telecommunications System (UMTS) , long term evolution (LTE) , LTE-Advanced (LTE-A) , the fifth generation (5G) New Radio (NR) , Wireless Fidelity (Wi-Fi) and Worldwide Interoperability for Microwave Access (WiMAX) standards, and employ any suitable communication technologies, including, for example, Multiple-Input Multiple-Output (MIMO) , Orthogonal Frequency Division Multiplexing (OFDM) , time division multiplexing (TDM) , frequency division multiplexing (FDM) , code division multiplexing (CDM) , Bluetooth, ZigBee, and machine type communication (MTC) , enhanced mobile broadband (eMBB) , massive machine type communication (mMTC) , ultra-reliable low latency communication (URLLC) , Carrier Aggregation (CA) , Dual Connection (DC) , and New Radio Unlicensed (NR-U) technologies.

The first device 210 is required to measure CLI from adjacent devices. For example, in the example embodiments where the first device 210 acts as a terminal device such as the UE 115 as shown in FIG. 1, the first device 210 needs to measure CLI from an adjacent device such as the UE 105. In the example embodiments where the first device 210 acts as a network device such as the gNB 120, the first device 210 may need to measure CLI from another network device such as the gNB 110. The CLI measurement may comprise CLI RSRP measurement such as SRS-RSRP measurement, CLI RSSI measurement and the like. The CLI measurement may be performed on a plurality of measurement resources in one or more measurement periods. The measurement resource may comprise a time and frequency resource block that contains several OFDM symbols in a time domain and several physical resource blocks (PRBs) in a frequency domain.

Moreover, the first device 210 has associated transmission to or from the first device 210. The transmission may comprise scheduled and autonomous transmission in any suitable link directions, including, for example, a DL direction, a UL direction, a sidelink (SL) direction and a backhaul link direction. As an example, the transmission may comprise Physical Downlink Shared Channel (PDSCH) , Physical Downlink Control Channel (PDCCH) , Physical Uplink Shared Channel (PUSCH) , Physical Uplink Control Channel (PUCCH) , SRS transmission and the like.

If the associated transmission occupies a measure resource or even a part of a measure resource configured for the CLI measurement, there will be collision between the transmission and the CLI measurement. In various example embodiments of the present disclosure, if the associated transmission is determined to occur on at least a part of a measurement resource within a measurement period, the first device 210 skips the CLI measurement on the part of the measurement resource or the whole measurement resource. Further, the first device 210 may send a measurement result to the second device to indicate that the measurement requirement is inapplicable to the measurement report due to the collision. Alternatively, the first device 210 may extend the measurement period to derive a qualified measurement result and send a measurement report to the second device 220. As such, the second device 220 will know the situation or behavior of the first device 210 in the CLI measurement. Alternatively, the first device 210 sends the measurement report to the second device 220 without the indication that the measurement requirement is inapplicable. The second device 220 can derive whether the received measurement report is qualified result or not based on its scheduling information, current link quality and the like.

FIG. 3 shows a flowchart of an example method 300 of adaptive CLI measurement according to some example embodiments of the present disclosure. As an example, the method 300 may be implemented at the first device 210. For the purpose of discussion, the method 300 will be described with reference to FIG. 2.

At block 305, the first device 210 determines occurrence of transmission associated with the first device 210 on at least a part of a measurement resource for CLI measurement within a measurement period. The associated transmission may comprise any suitable type of transmission in any suitable transmission direction, as described above. For example, in the example embodiments where the first device 210 is implemented by a terminal device such as the UE 115 as shown in FIG. 1, the transmission may comprise PDSCH, PDCCH, PUSCH, PUCCH or SRS transmission scheduled by a network device such as the gNB 120, and PUCCH transmission such as schedule request (SR) or Random Access Channel (RACH) transmission such as random access request (RAR) initiated by the first device 210.

A plurality of measurement resources may be allocated in the measurement period. One of the measurement resources may comprise a resource block with any suitable size, including, for example, a plurality of OFDM symbols and PRBs. The measurement resource may comprise the OFDM symbols and/or PRBs to be monitored by the first device 210 for CLI. Alternatively or in addition, the measurement resource may also comprise a predetermined number of OFDM symbols prior to and/or subsequent to the OFDM symbols to be monitored for CLI. The measurement resource may further comprise other PRBs than the PRBs to be monitored for CLI in the same OFDM symbols.

These measurement resources may be arranged within the measurement period in any suitable way. For example, these measurement resources may be configured in a plurality of measurement cycles periodically. One or more measurement resources are allocated in each of the measurement cycles. In the case that a plurality of measurement resources is allocated in a measurement cycle, these measurement resources may be separate or continuous. It is also possible that the measurement resources are configured within the measurement period semi-statistically or dynamically.

If a transmission resource for the associated transmission overlaps at least a part of a measurement resource, the collision will occur. The transmission resource may comprise a scheduled resource or a contention-based resource. The collision may occur on a whole measurement resource or a part of a measurement resource. For example, if the associated transmission may occupy the whole measurement resource, the collision will occur on the whole measurement resource. As another example, in the example embodiments where a measurement resource comprises a plurality of OFDM symbols in the time domain and a plurality of PRBs in the frequency domain, if the transmission resource overlaps some of the OFDM symbols and/or the PRBs, the collision occurs on only the overlapped part of the measurement resource. As yet another example, in some example embodiments, FDM may be applied by the network between the transmission and the CLI measurement to improve resource efficiency. In this case, the transmission will occupy the same OFDM symbols but different PRBs compared to the CLI measurement. If the first device 210 cannot support such FDM reception, the collision will also occur.

At block 310, the first device 210 skips the CLI measurement on at least the part of the measurement resource where the collision occurs. The collision may occur on a plurality of measurement resources or a plurality of parts of one or more measurement resources in the measurement period. Accordingly, the CLI measurement will be skipped on the corresponding measurement resources or the corresponding parts of measurement resources. Alternatively or in addition, if only a part of a measurement resource incurs collision, the first device 210 may skip the CLI measurement on the whole measurement resource.

At block 315, the first device 210 sends a measurement result to the second device 220 based on the measurement of cross link interference within at least the measurement period. In some example embodiments, upon the occurrence of the collision on a measurement resource such that the CLI measurement cannot be completed on the corresponding measurement resource, the first device 210 may send an indication, as part of the measurement result, that the measurement requirement is inapplicable due to the collision. The indication may be sent using a new or dedicated message or signaling or an exist message or signaling. For example, the indication may be included in the measurement report in the measurement result.

In some example embodiments, the measurement result may be sent at an end of the measurement period. Since at least a part of measurement resource or even one or more measurement resources may be skipped in the CLI measurement, a quantity of measurement resources on which the measurement of cross link interference has been performed by the first device 210 may be unable to reach a required quantity as specified by the measurement requirement, for example. Accordingly, the first device 210 may send an unqualified measurement report as the measurement result to the second device 220. For example, the first device 210 may include the derived CLI measurement report in the measurement result and send it to the second device 220. The CLI measurement report may contain a RSRP or RSSI derived by the first device 210. Based on the CLI measurement report, the network may know the occurrence of collision according to the used scheduling policies, and hence understand the received measurement report is invalid.

In some example embodiments, the first device 210 may make its own decision. For example, if the first device 210 determines that the quantity of measurement resources on which the CLI measurement has been performed is less than a required quantity, the first device 210 may send the indication that the measurement requirement is inapplicable. The required quantity may be represented by a quantity of measurement resources for a required number of measurements. For example, as shown above in Table 9.7.2.5-1 in 3GPP TS 38.133, the required quantity of resources may be defined as the measurement requires for 3 measurements i.e. 3 samples, which means that the CLI is required to be measured at least three times within the measurement period in order to reach a qualified accuracy performance. If the number of measurements having been performed is less than 3, the first device 210 may send the indication that the measurement requirement is inapplicable, or to indicate that the CLI measurement is inaccurate or invalid.

In some example embodiments, the required quantity may be specified as a required size of a measurement resource. For example, if the collision between the transmission and the CLI measurement occur on a part of a measurement resource and the part of the measurement resource is skipped, the size of the measurement resource where the CLI measurement has been performed is less than the allocated (or required) size, the first device 210 may send the indication that the measurement requirement is inapplicable.

Any suitable form of indications may be used to indicate that the measurement requirement is inapplicable. As an example, the indication may indicate that the CLI measurement is invalid or inaccurate or based on reduced measurement resources and/or samples and hence cannot or may not fulfill the expected accuracy requirement. As another example, in the example embodiments where the collision and further skipping occur on a part of a measurement resource, the first device 210 may send to the second device 220 an indication that the measurement report is based on a part of the symbols only. Accordingly, the second device 220 can determine that the measurement requirement does not apply.

The indication may be sent in any suitable way. For example, the indication may be carried in a separate or new information element (IE) in a measurement report from the first device 210 to the second device 220. Alternatively or in addition, the indication may be implemented by a specific measurement value (such as a zero value) in the CLI measurement report or even an empty report to indicate that the reported result is inaccurate or invalid and thus cannot fulfill the measurement requirement.

According to example embodiments of the present disclosure, the transmission is prioritized over the CLI measurement, and therefore the first device 210 will not perform the CLI measurement in the conflicting measurement occasion. Since the CLI measurement may be missed at the configured resource (s) , the CLI measurement requirement cannot be fulfilled. The indication for the inapplicable measurement requirement may inform the second device 220 of the situation or behavior of the first device 210. It may be up to the receiving party to detect and track the validity of the CLI measurement with or without the indication. For example, a network scheduler may detect whether the CLI measurement is impacted by scheduled DL or UL transmission such as PDSCH, PDCCH, PUSCH, PUCCH or SRS transmission, or UE autonomous transmission such as a random access request (RAR) or a scheduling request (SR) . In another example, the first device 210 may report CLI measurements and the second device 220 implicitly determines that the reported CLI measurement results are invalid or inaccurate, valid or accurate based on the possible scheduling or transmission overlap with the measurement occasion, possibly combined with the conditions of the first device 210, such as, for example, whether the first device 210 is in good or bad conditions, for example, based on SS-RSRP or alike measurements. Such measurements used by the second device 220 for determining the conditions of the first device 210 could be included in the CLI report or they could be from a separate measurement report.

Due to the missing of some measurement occasions for the CLI measurement within the measurement period, the CLI measurement requirement cannot be fulfilled. In some example embodiments, in order to fulfill the measurement requirement, the first device 210 may determine the measurement period as an extended measurement period. The extended measurement period may be determined by the first device 210 upon occurrence of the collision or at the end of the measurement period. In this way, the first device 210 will have more CLI measurement opportunities to derive more CLI measurements.

The extended measurement period may be used when the CLI measurement is triggered by an event, so as to facilitate the fulfilling of the expected measurement requirement. In some example embodiments, the second device 220 may indicate a timer to the first device 210 for the measurement result feedback to reduce the measurement delay. Upon the expiration of the timer, the first device 210 may report that the measurement period is extended or the measurement is still ongoing due to the collision.

In the case that the CLI measurement is configured periodically, if the CLI measurement cannot be completed due to one or more missed measurement resources within the current measurement period, the first device 210 may perform the CLI measurement in a next measurement period to derive the qualified measurement result. If the CLI measurement is completed in a later measurement period, the first device 210 can report a measurement result that fulfills the measurement requirement. In this case, the measurement period may not be extended to further improve the resource efficiency. It is also possible to extend the measurement period when the CLI measurement is configured periodically to ensure the measurement accuracy.

The extended measurement period may be determined by extending the measurement period by a time period. The time period comprises at least one measurement time interval, and at least one measurement resource is allocated in one measurement time interval. If a plurality of measurement time intervals is included in the time period, these measurement time intervals may be periodic or aperiodic.

Any suitable number of the measurement time intervals may be included in the time period to extend the measurement period. In some example embodiments, the number of measurement time intervals may be less than a predetermined number (referred to as a first number) to reduce the CLI measurement delay. The first number is represented by K which may be defined as the maximum allowed number of missed CLI measurement occurrences (or resources) due to the collision. In some example embodiments, in order to further reduce the overall CLI measurement delay, K may be in inverse proportion to a time length of a measurement time interval. For example, K1 and K2 are defined respectively for shorter and longer measurement time intervals, where K1≥ K2. Accordingly, K is set to K1 when the measurement time interval is shorter and set to K2 when the measurement time interval is longer. As such, tradeoff between the accuracy of the CLI measurement and the quantity of used resources may be allowed.

With more measurement resources in the extended measurement period, the first device 210 may be more likely to derive a qualified measurement result. If a quantity of measurement resources on which the CLI measurement has been performed from a start of the extended measurement period reaches the required quantity, the first device 210 may send a measurement result containing the qualified measurement report to the second device 220. If the quantity of measurement resources is less than the required quantity, the first device 210 may continue monitoring a next measurement resource within the extended measurement period. If the extended time period is expired and the quantity of measurement resource is still less than the required quantity, the first device 210 may send the indication that the measurement requirement is inapplicable, and send a unqualified measurement report.

FIG. 4 shows an example process 400 of expending the measurement period according to some example embodiments of the present disclosure.

In this example, the first device 210 is required to perform the CLI measurement on 3 measurement resources 405-1, 405-2 and 405-3 configured within 3 measurement time intervals 410-1, 410-2 and 410-3. Only one measurement resource is shown to be allocated in and from a start of the measurement time interval only for the purpose of illustration, without suggesting any limitation. There may be more measurement resources in a measurement time interval, and the measurement resources may be positioned at any suitable time in the measurement time interval.

As shown, starting from the third measurement resource 405-3, the first device 210 is scheduled with DL data/signaling transmission 415, and therefore the CLI measurement is skipped on the measurement resource 405-3. As at least three measurement resources are required to derive a qualified CLI measurement result, the first device 210 should perform the CLI measurement at least one more time. In this example, the first device 210 uses an extended measurement period 420 which includes six (that is, K=3, 3+3=6) measurement time intervals.

As shown, the transmission 415 occupies three measurement resources 405-3 to 405-5 in continuous measurement time intervals 410-3 to 410-5. Accordingly, the first device 210 performs the CLI measurement on a measurement resource 405-6 in the sixth measurement cycle 410-6 and fulfills the measurement requirement. By extending the measurement period to include 6 measurement time intervals, the first device 210 derives a qualified measurement result and sends to the second device 220 a measurement report 425 containing a measurement result fulfilling the accuracy requirement.

FIG. 5 shows an example process 500 of expending the measurement period according to some other example embodiments of the present disclosure.

In this example, the measurement resources 405-7 and 405-8 in the measurement time interval 410-7 and 410-8 are monitored for the CLI. However, the measurement resources 405-9 to 405-N (where N is a positive integer and N>K+9) in the measurement time intervals 410-9 to 410-N are missed due to the transmission 415, as shown. For the purpose of discussion, the measurement resources 405-1 to 405-N will be collectively referred to as a measurement resource 405, and the measurement cycle 410-1 to 410-N will be collectively referred to as a measurement cycle 410. Since the number of the missed measurement resources is larger than K, at the end of the extended measurement period, the first device 210 cannot derive a qualified measurement result and send an indication 505 that the measurement requirement is inapplicable together with the measurement report.

The measurement time interval may have any suitable time length. In some example embodiments, the time length of the measurement time interval may rely on time duration of an interfering signal associated with CLI. For example, in the example embodiments where SRS RSRP is measured, the measurement time interval may be equal to SRS periodicity.

In some example embodiments, the CLI measurement may be performed while the first device 210 is configured with Discontinuous Reception (DRX) . In a DRX mode, the first device 210 may only wake up for monitoring in active time of a DRX cycle. In other time of the DRX cycle (referred to as inactive time) , the first device 210 may be in sleeping mode to save power consumption. In these embodiments, the time length of the measurement time interval may be associated with a time length of a DRX cycle. For example, the time length of the measurement time interval may be selected from a time length of periodicity of the interfering signal or a time length of the DRX cycle.

The time length of the extended measurement period may also be associated with the DRX cycle. For example, the time length of the extended measurement period may be selected from a predetermined time length or a time length of a predetermined number (referred to as a second number) of measurement time intervals. An example configuration of the measurement period is shown in Table 1 as below.

Table 1

In this example, the CLI measurement is directed to SRSs sent by adjacent terminal devices. The time length of the measurement period is represented by T _{SRS_measurement_period} (ms) , and the time length of the measurement time interval is represented by T _SRS. As shown in Table 1, if no DRX is configured, the time length of the measurement period is set as Max (60, (3 + K ₀) ×T _SRS) where max () means retrieval of the maximum value and K ₀ represents the additional number (i.e. the first number) of measurement time intervals to extend the measurement period. If a DRX cycle is less than or equal to 320ms, the time length of the measurement period is set as Max (60, (3 + K ₀) × max (T _SRS, T _DRX) ) where T _DRX represents a time length of a DRX cycle. If a DRX cycle is greater than 320ms, the time length of the measurement period is set as (3 + K ₀) ×T _DRX.

By using the extended measurement period, the second device 220 is more likely to receive the measurement report that fulfills the measurement requirement and therefore can make the corresponding response to the CLI measurement result. In some example embodiments, the first device 210 may indicate the extending of the measurement period to the second device 220 such that the second device 220 is aware of the behavior of the first device 210.

In some example embodiments, the collision between the CLI measurement and the transmission may be avoided by resource scheduling or configuration. For example, when DRX is configured, the CLI measurement resource may be allocated within a time window in inactive time when the first device 210 is in a sleep mode. The time window may be determined to be time duration when DRX is used as specified in 3GPP TS 38.133 as below.

As specified, when DRX is used, the first device 210 is not scheduled with UL/DL transmission. Accordingly, the CLI measurement can be performed without collision with DL signaling/data transmission. By allocating the measurement resources in any time window within the time duration when the DRX is used, no collision will occur between the scheduled transmission and the CLI measurement occasions.

FIG. 6 shows an example configuration 600 of the CLI measurement in the case that DRX is configured to the first device 210 according to some example embodiments of the present disclosure.

As shown, in inactive time 605 outside of active time 610 in a DRX cycle 615, the first device 210 is in a sleep mode. A measurement resource 405 within a measurement time interval 410 is configured within the inactive time 605. Accordingly, the CLI measurement can be performed at a reasonable time window where no collision would happen.

In some example embodiments, considering the timing error, only a starting part of the measurement resource may be configured within the inactive time. The starting part of the measurement resource may comprise one or more OFDM symbols to be monitored for CLI. Alternatively or in addition, the starting part of the measurement resource may comprise one or more OFDM symbols prior to the OFDM symbols to be monitored.

In the case that the measurement resource is allocated within a time window when the first device 210 is in a sleep mode, there may also be collision if the active time expands too much due to more scheduled data. For example, the active time may overlap with the measurement resource. In this situation, the measurement resource may be skipped or the measurement period may be extended as described above. An example process of the CLI measurement in this situation will be discussed below with reference to FIG. 7.

FIG. 7 shows an example process 700 of the CLI measurement according to some example embodiments of the present disclosure.

As shown, the 1 ^st measurement resource 405-10 in the measurement period 420 is configured within the inactive time 605 of a DRX cycle 615-1. However, the active time 610 within the next DRX cycle 615-2 expands unexpectedly and collides with the configured CLI measurement resource 405-11. In this case, the first device 210 cannot derive the qualified measurement result that fulfills the measurement requirement and therefore sends an indication 505 that the measurement requirement does not apply.

It may also be possible that the CLI measurement is configured no matter regardless of whether DRX is used or not. For example, the first device 210 will not perform the CLI measurement if the measurement cannot be performed due to the interrupt of the scheduled data or due to the monitoring requirements according to DRX monitoring rules. In this case, the first device 210 may use the extended measurement period, or report an indication that the measurement result is inaccurate or invalid and therefore the measurement requirement is inapplicable.

As describe above, the collision between the transmission and the CLI measurement may be avoided by resource scheduling or configuration when DRX is configured. Some example embodiments in this regard will be discussed with reference to FIG. 8 as follows.

FIG. 8 shows a flowchart of an example method 800 of CLI measurement configuration according to some example embodiments of the present disclosure. As an example, the method 800 may be implemented at the second device 220. For the purpose of discussion, the method 800 will be described with reference to FIG. 2.

At block 805, when the first device 210 is configured with DRX, the second device 220 allocates at least one measurement resource to the first device 210 in a measurement time interval within a measurement period, and at least a starting part of the at least one measurement resource is within inactive time of a DRX cycle. In some example embodiments, the measurement resource may be allocated within the inactive time of the DRX cycle. In some other example embodiments, considering the timing error, only a starting part of the measurement resource may be configured within the inactive time. In the case that the measurement resource comprises a plurality of OFDM symbols, the starting part of the measurement resource may comprise the OFDM symbols to be monitored or a predetermined number of OFDM symbols prior to the OFDM symbols to be monitored. By such resource scheduling or allocation, the second device 210 may reduce potential collision between the scheduled transmission and the CLI measurement occasions.

After the measurement period is configured, at block 810, the second device 220 sends an indication of the at least one measurement resource to the first device 210. The indication may be implemented in any suitable form that already exists or is to be developed in the future.

When the collision occurs between the transmission associated with the first device 210 and the CLI measurement on at least a part of a measurement resource within the measurement period, the second device 220 may receive a measurement result based on the CLI measurement performed by the first device 210. The measurement result may comprise a measurement report and/or an indication that the measurement requirement is inapplicable.

In the example embodiments where the measurement report is received as the measurement result, the second device 220 may determine whether the measurement report is qualified. The determination may be based on the scheduling information and also the link quality information. The link quality information could be for example RSRP, Reference Signal Received Quality (RSRQ) , RSSI and the like.

The configuring or scheduling of CLI measurement can be implemented by a network device such as a gNB. It is also possible that the configuring or scheduling is implemented at a terminal device (such as a UE) with the corresponding enhanced functionality.

All operations and features as described above with reference to FIGS. 2-7 can be likewise applicable to the method 800 and have similar effects. For the purpose of simplification, the details will be omitted.

FIG. 9 is a simplified block diagram of a device 900 that is suitable for implementing example embodiments of the present disclosure. The device 900 can be implemented at or as a part of the first device 210 or the second device 220 as shown in FIG. 2.

As shown, the device 900 includes a processor 910, a memory 920 coupled to the processor 910, a communication module 920 coupled to the processor 910, and a communication interface (not shown) coupled to the communication module 920. The memory 920 stores at least a program 940. The communication module 920 is for bidirectional communications, for example, via multiple antennas. The communication interface may represent any interface that is necessary for communication.

The program 940 is assumed to include program instructions that, when executed by the associated processor 910, enable the device 900 to operate in accordance with the example embodiments of the present disclosure, as discussed herein with reference to FIGS. 2-8. The example embodiments herein may be implemented by computer software executable by the processor 910 of the device 900, or by hardware, or by a combination of software and hardware. The processor 910 may be configured to implement various example embodiments of the present disclosure.

The memory 920 may be of any type suitable to the local technical network and may be implemented using any suitable data storage technology, such as a non-transitory computer readable storage medium, semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. While only one memory 920 is shown in the device 900, there may be several physically distinct memory modules in the device 900. The processor 910 may be of any type suitable to the local technical network, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples. The device 900 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.

When the device 900 acts as the first device 210, the processor 910 may implement the method 300 as described above with reference to FIGS. 2-7. When the device 900 acts as the second device 220, the processor 910 may implement the method 800 as described above with reference to FIG. 8. All operations and features as described above with reference to FIGS. 2-8 are likewise applicable to the device 900 and have similar effects. For the purpose of simplification, the details will be omitted.

Generally, various example embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of example embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.

The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium. The computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the

method

300 or 800 as described above with reference to FIGS. 2-8. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types. The functionality of the program modules may be combined or split between program modules as desired in various example embodiments. Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.

Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented. The program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.

In the context of the present disclosure, the computer program codes or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above. Examples of the carrier include a signal, computer readable media.

The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the computer readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , Digital Versatile Disc (DVD) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

Further, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are contained in the above discussions, these should not be construed as limitations on the scope of the present disclosure, but rather as descriptions of features that may be specific to particular example embodiments. Certain features that are described in the context of separate example embodiments may also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented in multiple example embodiments separately or in any suitable sub-combination.

Although the present disclosure has been described in languages specific to structural features and/or methodological acts, it is to be understood that the present disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Various example embodiments of the techniques have been described. In addition to or as an alternative to the above, the following examples are described. The features described in any of the following examples may be utilized with any of the other examples described herein.

In some aspects, a first device comprises: at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the first device to: determine an occurrence of transmission associated with a first device on at least a part of a measurement resource for measurement of cross link interference within a measurement period; skip the measurement of cross link interference on at least the part of the measurement resource; and send a measurement result to a second device based on the measurement of cross link interference within at least the measurement period.

In some example embodiments, the first device is caused to send the measurement result by: determining, within the measurement period, a quantity of measurement resources on which the measurement of cross link interference has been performed; and in response to the quantity of measurement resources being less than a required quantity, sending, to the second device, the measurement result comprising an indication that a measurement requirement associated with the measurement of cross link interference is inapplicable.

In some example embodiments, the indication is carried in an information element of a measurement report from the first device to the second device.

In some example embodiments, the first device is further caused to: determine the measurement period as an extended measurement period, and the first device is caused to send the measurement result by sending the measurement result to the second device based on the measurement of cross link interference within the extended measurement period.

In some example embodiments, the extended measurement period is determined by extending the measurement period by a time period comprising at least one measurement time interval, at least one measurement resource being allocated in one of the at least one measurement time interval, and the number of the at least one measurement time interval is less than or equal to a first number.

In some example embodiments, the first number is in inverse proportion to a time length of a measurement time interval of the at least one measurement time interval.

In some example embodiments, the first device is configured with discontinuous reception, and a time length of a measurement time interval of the at least one measurement time interval is selected from a time length of a discontinuous reception cycle and a time length of periodicity of an interfering signal associated with the cross link interference.

In some example embodiments, the extended measurement period comprises a plurality of measurement time intervals, and a time length of the extended measurement period is less than or equal to a time length selected from a predetermined time length or a time length of a second number of measurement time intervals.

In some example embodiments, the first device is caused to send the measurement result by: determining, a quantity of measurement resources on which the measurement of cross link interference has been performed from a start of the extended measurement period; and performing an act comprising one of: in accordance with a determination that the quantity of measurement resources is less than a required quantity and the extended measurement period is unexpired, monitoring a next measurement resource within the extended measurement period; in accordance with a determination that the quantity of measurement resources reaches the required quantity, sending, to the second device, the measurement result comprising a measurement report; or in accordance with a determination that the quantity of measurement resources is less than the required quantity and the extended measurement period is expired, sending, to the second device, the measurement result comprising an indication that a measurement requirement associated with the measurement of cross link interference is inapplicable.

In some example embodiments, the first device is configured with discontinuous reception, and the measurement period comprises a plurality of measurement time intervals, each of the plurality of measurement time intervals configured with at least one measurement resource, and at least a starting part of the at least one measurement resource is within inactive time of a discontinuous reception cycle.

In some example embodiments, a measurement resource of the at least one measurement resource comprises a plurality of Orthogonal Frequency Division Multiplexing symbols configured for the measurement of cross link interference and a predetermined number of Orthogonal Frequency Division Multiplexing symbols prior to the configured Orthogonal Frequency Division Multiplexing symbols.

In some aspects, a second device comprises: at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the second device to: allocate, in a measurement time interval within a measurement period, at least one measurement resource for measurement of cross link interference by a first device configured with discontinuous reception, at least a starting part of the at least one measurement resource being within inactive time of a discontinuous reception cycle; and send an indication of the at least one measurement resource to the first device.

In some example embodiments, the at least one measurement resource comprises a plurality of Orthogonal Frequency Division Multiplexing symbols configured for the measurement of cross link interference and a predetermined number of Orthogonal Frequency Division Multiplexing symbols prior to the configured Orthogonal Frequency Division Multiplexing symbols.

In some example embodiments, the second device is further caused to: receive, from the first device, a measurement result based on the measurement of cross link interference performed by the first device within at least the measurement period.

In some example embodiments, the measurement period is determined as an extended measurement period, and the second device is caused to receive the measurement result by: receiving, from the first device, the measurement result based on the measurement of cross link interference performed by the first device within the extended measurement period.

In some example embodiments, the measurement result comprises at least one of a measurement report or an indication that a measurement requirement associated with the measurement of cross link interference is inapplicable.

In some example embodiments, the measurement result comprises the measurement report, and the second device is further caused to: determine whether the measurement requirement is inapplicable to the measurement report.

In some aspects, a method comprises: determining an occurrence of transmission associated with a first device on at least a part of a measurement resource for measurement of cross link interference within a measurement period; skipping the measurement of cross link interference on at least the part of the measurement resource; and sending a measurement result to a second device based on the measurement of cross link interference within at least the measurement period.

In some example embodiments, sending the measurement result comprises: determining, within the measurement period, a quantity of measurement resources on which the measurement of cross link interference has been performed; and in response to the quantity of measurement resources being less than a required quantity, sending, to the second device, the measurement result comprising an indication that a measurement requirement associated with the measurement of cross link interference is inapplicable.

In some example embodiments, the method further comprises: determining the measurement period as an extended measurement period, sending the measurement result comprises sending the measurement result to the second device based on the measurement of cross link interference within the extended measurement period.

In some example embodiments, sending the measurement result comprises: determining, a quantity of measurement resources on which the measurement of cross link interference has been performed from a start of the extended measurement period; and performing an act comprising one of: in accordance with a determination that the quantity of measurement resources is less than a required quantity and the extended measurement period is unexpired, monitoring a next measurement resource within the extended measurement period; in accordance with a determination that the quantity of measurement resources reaches the required quantity, sending, to the second device, the measurement result comprising a measurement report; or in accordance with a determination that the quantity of measurement resources is less than the required quantity and the extended measurement period is expired, sending, to the second device, the measurement result comprising an indication that a measurement requirement associated with the measurement of cross link interference is inapplicable.

In some aspects, a method comprises: allocating, in a measurement time interval within a measurement period, at least one measurement resource for measurement of cross link interference by a first device configured with discontinuous reception, at least a starting part of the at least one measurement resource being within inactive time of a discontinuous reception cycle; and sending an indication of the at least one measurement resource to the first device.

In some example embodiments, the method further comprises: receiving, from the first device, a measurement result based on the measurement of cross link interference performed by the first device within at least the measurement period.

In some example embodiments, the measurement period is determined as an extended measurement period, and receiving the measurement result comprises: receiving, from the first device, the measurement result based on the measurement of cross link interference performed by the first device within the extended measurement period.

In some example embodiments, the measurement result comprises the measurement report, and the method further comprises: determining whether the measurement requirement is inapplicable to the measurement report.

In some aspects, an apparatus comprises: means for determining an occurrence of transmission associated with a first device on at least a part of a measurement resource for measurement of cross link interference within a measurement period; means for skipping the measurement of cross link interference on at least the part of the measurement resource; and means for sending a measurement result to a second device based on the measurement of cross link interference within at least the measurement period.

In some example embodiments, the means for sending the measurement result comprises: means for determining, within the measurement period, a quantity of measurement resources on which the measurement of cross link interference has been performed; and means for in response to the quantity of measurement resources being less than a required quantity, sending, to the second device, the measurement result comprising an indication that a measurement requirement associated with the measurement of cross link interference is inapplicable.

In some example embodiments, the apparatus further comprises: means for determining the measurement period as an extended measurement period, and the means for sending the measurement result comprises means for sending the measurement result to the second device based on the measurement of cross link interference within the extended measurement period.

In some example embodiments, the means for sending the measurement result comprises: means for determining, a quantity of measurement resources on which the measurement of cross link interference has been performed from a start of the extended measurement period; and means for performing an act comprising one of: in accordance with a determination that the quantity of measurement resources is less than a required quantity and the extended measurement period is unexpired, monitoring a next measurement resource within the extended measurement period; in accordance with a determination that the quantity of measurement resources reaches the required quantity, sending, to the second device, the measurement result comprising a measurement report; or in accordance with a determination that the quantity of measurement resources is less than the required quantity and the extended measurement period is expired, sending, to the second device, the measurement result comprising an indication that a measurement requirement associated with the measurement of cross link interference is inapplicable.

In some aspects, an apparatus comprises: means for allocating, in a measurement time interval within a measurement period, at least one measurement resource for measurement of cross link interference by a first device configured with discontinuous reception, at least a starting part of the at least one measurement resource being within inactive time of a discontinuous reception cycle; and means for sending an indication of the at least one measurement resource to the first device.

In some example embodiments, the apparatus further comprises: means for receiving, from the first device, a measurement result based on the measurement of cross link interference performed by the first device within at least the measurement period.

In some example embodiments, the measurement period is determined as an extended measurement period, and the means for receiving the measurement result comprises: means for receiving, from the first device, the measurement result based on the measurement of cross link interference performed by the first device within the extended measurement period.

In some example embodiments, the measurement result comprises the measurement report, and the apparatus further comprises: means for determining whether the measurement requirement is inapplicable to the measurement report.

In some aspects, a computer readable storage medium comprises program instructions stored thereon, the instructions, when executed by a processor of a device, causing the device to perform the method according to some example embodiments of the present disclosure.

Claims

A first device, comprising:

at least one processor; and

at least one memory including computer program code;

the at least one memory and the computer program code configured to, with the at least one processor, cause the first device to:

determine an occurrence of transmission associated with a first device on at least a part of a measurement resource for measurement of cross link interference within a measurement period;

skip the measurement of cross link interference on at least the part of the measurement resource; and

send a measurement result to a second device based on the measurement of cross link interference within at least the measurement period.
The first device of claim 1, wherein the first device is caused to send the measurement result by:

determining, within the measurement period, a quantity of measurement resources on which the measurement of cross link interference has been performed; and

in response to the quantity of measurement resources being less than a required quantity, sending, to the second device, the measurement result comprising an indication that a measurement requirement associated with the measurement of cross link interference is inapplicable.
The first device of claim 2, wherein the indication is carried in an information element of a measurement report from the first device to the second device.
The first device of claim 1, wherein the first device is further caused to:

determine the measurement period as an extended measurement period,

wherein the first device is caused to send the measurement result by sending the measurement result to the second device based on the measurement of cross link interference within the extended measurement period.
The first device of claim 4, wherein the extended measurement period is determined by extending the measurement period by a time period comprising at least one measurement time interval, at least one measurement resource being allocated in one of the at least one measurement time interval, and the number of the at least one measurement time interval is less than or equal to a first number.
The first device of claim 5, wherein the first number is in inverse proportion to a time length of a measurement time interval of the at least one measurement time interval.
The first device of claim 5, wherein the first device is configured with discontinuous reception, and

wherein a time length of a measurement time interval of the at least one measurement time interval is selected from a time length of a discontinuous reception cycle and a time length of periodicity of an interfering signal associated with the cross link interference.
The first device of claim 4, wherein the extended measurement period comprises a plurality of measurement time intervals, and a time length of the extended measurement period is less than or equal to a time length selected from a predetermined time length or a time length of a second number of measurement time intervals.
The first device of claim 4, wherein the first device is caused to send the measurement result by:

determining, a quantity of measurement resources on which the measurement of cross link interference has been performed from a start of the extended measurement period; and

performing an act comprising one of:

in accordance with a determination that the quantity of measurement resources is less than a required quantity and the extended measurement period is unexpired, monitoring a next measurement resource within the extended measurement period;

in accordance with a determination that the quantity of measurement resources reaches the required quantity, sending, to the second device, the measurement result comprising a measurement report; or

in accordance with a determination that the quantity of measurement resources is less than the required quantity and the extended measurement period is expired, sending, to the second device, the measurement result comprising an indication that a measurement requirement associated with the measurement of cross link interference is inapplicable.
The first device of claim 1, wherein the first device is configured with discontinuous reception, and

wherein the measurement period comprises a plurality of measurement time intervals, each of the plurality of measurement time intervals configured with at least one measurement resource, and at least a starting part of the at least one measurement resource is within inactive time of a discontinuous reception cycle.
The first device of claim 10, wherein a measurement resource of the at least one measurement resource comprises a plurality of Orthogonal Frequency Division Multiplexing symbols configured for the measurement of cross link interference and a predetermined number of Orthogonal Frequency Division Multiplexing symbols prior to the configured Orthogonal Frequency Division Multiplexing symbols.
A second device, comprising:

at least one processor; and

at least one memory including computer program code;

the at least one memory and the computer program code configured to, with the at least one processor, cause the second device to:

allocate, in a measurement time interval within a measurement period, at least one measurement resource for measurement of cross link interference by a first device configured with discontinuous reception, at least a starting part of the at least one measurement resource being within inactive time of a discontinuous reception cycle; and

send an indication of the at least one measurement resource to the first device.
The second device of claim 12, wherein the at least one measurement resource comprises a plurality of Orthogonal Frequency Division Multiplexing symbols configured for the measurement of cross link interference and a predetermined number of Orthogonal Frequency Division Multiplexing symbols prior to the configured Orthogonal Frequency Division Multiplexing symbols.
The second device of claim 12, wherein the second device is further caused to:

receive, from the first device, a measurement result based on the measurement of cross link interference performed by the first device within at least the measurement period.
The second device of claim 14, wherein the measurement period is determined as an extended measurement period, and the second device is caused to receive the measurement result by:

receiving, from the first device, the measurement result based on the measurement of cross link interference performed by the first device within the extended measurement period.
The second device of claim 12, wherein the measurement result comprises at least one of a measurement report or an indication that a measurement requirement associated with the measurement of cross link interference is inapplicable.
The second device of claim 16, wherein the measurement result comprises the measurement report, and the second device is further caused to:

determine whether the measurement requirement is inapplicable to the measurement report.
A method, comprising:

determining an occurrence of transmission associated with a first device on at least a part of a measurement resource for measurement of cross link interference within a measurement period;

skipping the measurement of cross link interference on at least the part of the measurement resource; and

sending a measurement result to a second device based on the measurement of cross link interference within at least the measurement period.
The method of claim 18, wherein sending the measurement result comprises:

determining, within the measurement period, a quantity of measurement resources on which the measurement of cross link interference has been performed; and

in response to the quantity of measurement resources being less than a required quantity, sending, to the second device, the measurement result comprising an indication that a measurement requirement associated with the measurement of cross link interference is inapplicable.
The method of claim 19, wherein the indication is carried in an information element of a measurement report from the first device to the second device.
The method of claim 19, further comprising:

determining the measurement period as an extended measurement period,

wherein sending the measurement result comprises sending the measurement result to the second device based on the measurement of cross link interference within the extended measurement period.
The method of claim 21, wherein the extended measurement period is determined by extending the measurement period by a time period comprising at least one measurement time interval, at least one measurement resource being allocated in one of the at least one measurement time interval, and the number of the at least one measurement time interval is less than or equal to a first number.
The method of claim 22, wherein the first number is in inverse proportion to a time length of a measurement time interval of the at least one measurement time interval.
The method of claim 22, wherein the first device is configured with discontinuous reception, and

wherein a time length of a measurement time interval of the at least one measurement time interval is selected from a time length of a discontinuous reception cycle and a time length of periodicity of an interfering signal associated with the cross link interference.
The method of claim 21, wherein the extended measurement period comprises a plurality of measurement time intervals, and a time length of the extended measurement period is less than or equal to a time length selected from a predetermined time length or a time length of a second number of measurement time intervals.
The method of claim 21, wherein sending the measurement result comprises:

determining, a quantity of measurement resources on which the measurement of cross link interference has been performed from a start of the extended measurement period; and

performing an act comprising one of:

in accordance with a determination that the quantity of measurement resources is less than a required quantity and the extended measurement period is unexpired, monitoring a next measurement resource within the extended measurement period;

in accordance with a determination that the quantity of measurement resources reaches the required quantity, sending, to the second device, the measurement result comprising a measurement report; or

in accordance with a determination that the quantity of measurement resources is less than the required quantity and the extended measurement period is expired, sending, to the second device, the measurement result comprising an indication that a measurement requirement associated with the measurement of cross link interference is inapplicable.
The method of claim 18, wherein the first device is configured with discontinuous reception, and

wherein the measurement period comprises a plurality of measurement time intervals, each of the plurality of measurement time intervals configured with at least one measurement resource, and at least a starting part of the at least one measurement resource is within inactive time of a discontinuous reception cycle.
The method of claim 27, wherein a measurement resource of the at least one measurement resource comprises a plurality of Orthogonal Frequency Division Multiplexing symbols configured for the measurement of cross link interference and a predetermined number of Orthogonal Frequency Division Multiplexing symbols prior to the configured Orthogonal Frequency Division Multiplexing symbols.
A method, comprising:

allocating, in a measurement time interval within a measurement period, at least one measurement resource for measurement of cross link interference by a first device configured with discontinuous reception, at least a starting part of the at least one measurement resource being within inactive time of a discontinuous reception cycle; and

sending an indication of the at least one measurement resource to the first device.
The method of claim 29, wherein the at least one measurement resource comprises a plurality of Orthogonal Frequency Division Multiplexing symbols configured for the measurement of cross link interference and a predetermined number of Orthogonal Frequency Division Multiplexing symbols prior to the configured Orthogonal Frequency Division Multiplexing symbols.
The method of claim 29, further comprising:

receiving, from the first device, a measurement result based on the measurement of cross link interference performed by the first device within at least the measurement period.
The method of claim 31, wherein the measurement period is determined as an extended measurement period, and receiving the measurement result comprises:

receiving, from the first device, the measurement result based on the measurement of cross link interference performed by the first device within the extended measurement period.
The method of claim 29, wherein the measurement result comprises at least one of a measurement report or an indication that a measurement requirement associated with the measurement of cross link interference is inapplicable.
The method of claim 33, wherein the measurement result comprises the measurement report, and the method further comprises:

determining whether the measurement requirement is inapplicable to the measurement report.
An apparatus comprising:

means for determining an occurrence of transmission associated with a first device on at least a part of a measurement resource for measurement of cross link interference within a measurement period;

means for skipping the measurement of cross link interference on at least the part of the measurement resource; and

means for sending a measurement result to a second device based on the measurement of cross link interference within at least the measurement period.
An apparatus comprising:

means for allocating, in a measurement time interval within a measurement period, at least one measurement resource for measurement of cross link interference by a first device configured with discontinuous reception, at least a starting part of the at least one measurement resource being within inactive time of a discontinuous reception cycle; and

means for sending an indication of the at least one measurement resource to the first device.
A computer readable storage medium comprising program instructions stored thereon, the instructions, when executed by a processor of an apparatus, causing the apparatus to perform the method of any of claims 18-28.
A computer readable storage medium comprising program instructions stored thereon, the instructions, when executed by a processor of an apparatus, causing the apparatus to perform the method of any of claims 29-34.