Devices and methods for CSI-RS based measurement and reporting
By adjusting for non-contiguous CSI-RS resources in SBFD operations with specific metrics and values, the CSI-RS measurement and reporting accuracy is enhanced, addressing the challenges of non-contiguous CSI-RS resources in SBFD operations.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-10-03
- Publication Date
- 2026-04-09
AI Technical Summary
Existing CSI-RS measurement and reporting methods in sub-band full duplex (SBFD) operations face challenges due to non-contiguous CSI-RS resources in the frequency domain, which affect measurement accuracy.
A terminal device and network device configured for SBFD operations perform CSI-RS measurements and reporting, ensuring measurement accuracy by determining and adjusting for non-contiguous CSI-RS resources based on specific metrics and adjustment values, such as offset factors and relaxation values, to meet accuracy requirements.
Ensures reliable and accurate CSI-RS measurements and reporting in SBFD operations by addressing the issues of non-contiguous CSI-RS resources, enhancing the feasibility and reliability of CSI-RS based measurement and reporting.
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Figure CN2024123223_09042026_PF_FP_ABST
Abstract
Description
DEVICES AND METHODS FOR CSI-RS BASED MEASUREMENT AND REPORTINGFIELD
[0001] Embodiments of the present disclosure generally relate to the field of communication, and in particular to devices, methods, and a non-transitory computer readable medium for channel state information reference signal (CSI-RS) based measurement and reporting.BACKGROUND
[0002] New Radio (NR) , which is also called as the 5th generation (5G) mobile network, is a new global wireless standard after 1G, 2G, 3G, and 4G networks. The NR wireless technology is meant to deliver higher multi-Gbps peak data speeds, ultra-low latency, more reliability, massive network capacity, increased availability, and a more uniform user experience to more users. Higher performance and improved efficiency empower new user experiences and connects new industries.
[0003] 5G-Advanced and 6G is the next evolutionary step in 5G technology and it will bring a new level of enhanced capabilities beyond connectivity and enable a wider set of advanced use cases for verticals. Especially, in Rel-19, a new mode of operation in unpaired spectrum, i.e., sub-band full duplex (SBFD) , is being specified, wherein separate sets of resource blocks (RBs) within a time division duplexing (TDD) carrier are used for uplink (UL) and downlink (DL) transmission simultaneously. The intention of SBFD is to allow more UL transmission opportunities compared to the typical DL-heavy TDD configurations used in today’s TDD deployments. The SBFD may bring benefits in terms of UL coverage and UL latency especially in wide area macro networks, where many terminal devices (such as user equipment (UE) ) are in power-limited conditions in the UL direction.
[0004] However, some issues related to the SBFD are still to be solved, especially on CSI-RS based measurement and report.SUMMARY
[0005] In general, example embodiments of the present disclosure provide devices, methods and a computer readable medium for CSI-RS based measurement and reporting.
[0006] In a first aspect, there is provided a terminal device. The terminal device comprises a processor and a transceiver coupled to the processor. The processor is configured to receive a measurement configuration on a channel state information reference signal, CSI-RS, resources in a cell configured with a sub-band full duplex, SBFD, operation; and perform a measurement on the CSI-RS resources based on the measurement configuration and generate a measurement reporting based on the measurement, wherein the measurement reporting is determined to meet a measurement accuracy requirement determined based on resources for the SBFD operation and the CSI-RS resources, and wherein the CSI-RS resources are non-contiguous in a frequency domain.
[0007] In a second aspect, there is provided a network device. The network device comprises a processor and a transceiver coupled to the processor. The processor is configured to transmit a measurement configuration on a channel state information reference signal, CSI-RS, resources in a cell configured with a sub-band full duplex, SBFD, operation; receive a measurement reporting of CSI-RS for the SBFD operation, wherein the measurement reporting is determined to meet a measurement accuracy requirement determined based on resources for the SBFD operation and the CSI-RS resources, and wherein the CSI-RS resources are non-contiguous in a frequency domain.
[0008] In a third aspect, there is provided a method performed by a terminal device. The method comprises receiving a measurement configuration on a channel state information reference signal, CSI-RS, resources in a cell configured with a sub-band full duplex, SBFD, operation; and performing a measurement on the CSI-RS resources based on the measurement configuration and generate a measurement reporting based on the measurement, wherein the measurement reporting is determined to meet a measurement accuracy requirement determined based on resources for the SBFD operation and the CSI-RS resources, and wherein the CSI-RS resources are non-contiguous in a frequency domain.
[0009] In a fourth aspect, there is provided a method performed by a network device. The method comprises transmitting a measurement configuration on a channel state information reference signal, CSI-RS, resources in a cell configured with a sub-band full duplex, SBFD, operation; and receiving a measurement reporting of CSI-RS for the SBFD operation, wherein the measurement reporting is determined to meet a measurement accuracy requirement determined based on resources for the SBFD operation and the CSI-RS resources, and wherein the CSI-RS resources are non-contiguous in a frequency domain.
[0010] In a fifth aspect, there is provided an apparatus of terminal device. The apparatus comprises means for receiving a measurement configuration on a channel state information reference signal, CSI-RS, resources in a cell configured with a sub-band full duplex, SBFD, operation; and means for performing a measurement on the CSI-RS resources based on the measurement configuration and generate a measurement reporting based on the measurement, wherein the measurement reporting is determined to meet a measurement accuracy requirement determined based on resources for the SBFD operation and the CSI-RS resources, and wherein the CSI-RS resources are non-contiguous in a frequency domain.
[0011] In a sixth aspect, there is provided a network device. The network device comprises means for transmitting a measurement configuration on a channel state information reference signal, CSI-RS, resources in a cell configured with a sub-band full duplex, SBFD, operation; and means for receiving a measurement reporting of CSI-RS for the SBFD operation, wherein the measurement reporting is determined to meet a measurement accuracy requirement determined based on resources for the SBFD operation and the CSI-RS resources, and wherein the CSI-RS resources are non-contiguous in a frequency domain.
[0012] In a seventh aspect, there is provided a terminal device comprising: a processor; and a memory storing instructions, the memory and the instructions being configured, with the processor, to cause the terminal device to perform the method according to the third aspect above.
[0013] In an eighth aspect, there is provided a network device comprising: a processor; and a memory storing instructions, the memory and the instructions being configured, with the processor, to cause the network device to perform the method according to the fourth aspect above.
[0014] In a ninth aspect, there is provided a non-transitory computer readable medium. The non-transitory computer readable medium having program instructions stored thereon. The program instructions, when executed by an apparatus, causing the apparatus at least to perform the method according to the third aspect or the fourth aspect above.
[0015] In a tenth aspect, there is provided a computer program product. The computer program product is encoded with instructions for performing the method according to the third aspect or the fourth aspect above.
[0016] It is to be understood that the summary section is not intended to identify key or essential features of 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
[0017] Some embodiments will now be described with reference to the accompanying drawings, in which:
[0018] FIG. 1 illustrates an example network environment in which some embodiments of the present disclosure can be implemented;
[0019] FIG. 2 illustrates an example diagram for a TDD operation, a frequency division duplexing (FDD) , and an SBFD operation.
[0020] FIG. 3 illustrates example configurations of UL and DL resources for an SBFD operation;
[0021] FIG. 4 illustrates an example table for the existing (i.e., non-SBFD) reference signal measurement accuracy;
[0022] FIG. 5 illustrates an example scenario for an SBFD operation in which some embodiments of the present disclosure can be implemented;
[0023] FIG. 6 illustrates an example signaling chart of an example process according to some embodiments of the present disclosure;
[0024] FIG. 7 illustrates a flowchart of a method implemented at a terminal device according to some embodiments of the present disclosure;
[0025] FIG. 8 illustrates a flowchart of a method implemented at a network device according to some embodiments of the present disclosure;
[0026] FIG. 9 illustrates a simplified block diagram of an apparatus that is suitable for implementing embodiments of the present disclosure.
[0027] Throughout the drawings, the same or similar reference numerals represent the same or similar elements.DETAILED DESCRIPTION
[0028] Principles of the present disclosure will now be described with reference to some embodiments. It is to be understood that these 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 may be implemented in various manners other than the ones described below.
[0029] 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.
[0030] References in the present disclosure to “one embodiment, ” “an example embodiment, ” “an embodiment, ” “some embodiments, ” and the like indicate that the embodiment (s) described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment (s) . Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
[0031] It shall be understood that although the terms “first” and “second” or 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 element. For example, a first element could also be termed as a second element, and similarly, a second element could also be termed as a first element, without departing from the scope of embodiments. As used herein, the term “and / or” includes any and all combinations of one or more of the listed terms.
[0032] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. 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. It will be further understood that the terms “comprises” , “comprising” , “has” , “having” , “includes” and / or “including” , when used herein, specify the presence of stated features, elements, and / or components etc., but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof.
[0033] As used herein, the term “communication network” refers to a network following any suitable communication standards, such as, 5G NR, Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , Narrow Band Internet of Things (NB-IoT) , and so on. Further, the communications between a terminal device and a network device in the communication network may be performed according to any suitable generation communication protocols, including but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the 5G communication protocols, the 6G communication protocols and / or any other protocols either currently known or to be developed in the future. Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will also be future type communication technologies and systems in which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the aforementioned systems.
[0034] As used herein, the term “network device” generally refers to a node in a communication network via which a terminal device can access the communication network and receive services therefrom. The network device may refer to a base station (BS) or an access point (AP) , for example, a node B (NodeB or NB) , a radio access network (RAN) node, an evolved NodeB (eNodeB or eNB) , a NR NB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , an infrastructure device for a V2X (vehicle-to-everything) communication, a transmission and reception point (TRP) , a reception point (RP) , a remote radio head (RRH) , a relay, an integrated access and backhaul (IAB) node, a low power node such as a femto BS, a pico BS, and so forth, depending on the applied terminology and technology.
[0035] As used herein, the term “terminal device” generally refers to any end device that may be capable of wireless communications. By way of example rather than a limitation, a terminal device may also be referred to as a communication device, a user equipment (UE) , an end user device, a subscriber station (SS) , an unmanned aerial vehicle (UAV) , a portable subscriber station, a mobile station (MS) , or an access terminal (AT) . The terminal device may include, but is not limited to, a mobile phone, a cellular phone, a smart phone, a voice over IP (VoIP) phone, a wireless local loop phone, a tablet, a wearable terminal device, a personal digital assistant (PDA) , a portable computer, a desktop computer, an image capture terminal device such as a digital camera, a gaming terminal device, a music storage and playback appliance, a vehicle-mounted wireless terminal device, a wireless endpoint, a mobile station, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , a USB dongle, a smart device, wireless customer-premises equipment (CPE) , an Internet of Things (loT) device, a watch or other wearable, a head-mounted display (HMD) , a vehicle, a drone, a medical device (for example, a remote surgery device) , an industrial device (for example, a robot and / or other wireless devices operating in an industrial and / or an automated processing chain contexts) , a consumer electronics device, a device operating on commercial and / or industrial wireless networks, and the like. In the following description, the terms: “terminal device, ” “communication device, ” “terminal, ” “user equipment” and “UE, ” may be used interchangeably.
[0036] As used herein, the term “resource, ” “transmission resource, ” “resource block, ” “physical resource block, ” “uplink resource, ” or “downlink resource” may refer to any resource, for example a resource in time domain, a resource in frequency domain, a resource in space domain, a resource in code domain, or any other resource enabling a communication, and the like, used for performing a communication between a terminal device and a network device or between terminal devices. In the following, a resource in both frequency and time domain will be used as an example of a transmission resource for describing some embodiments of the present disclosure. It is noted that embodiments of the present disclosure equally apply to other resources in other domains.
[0037] FIG. 1 illustrates an example network environment 100 in which example embodiments of the present disclosure may be implemented. The environment 100, which may be a part of a communication network, comprises terminal devices and network devices.
[0038] As illustrated in FIG. 1, the communication network 100 may comprise a terminal device 110 (hereinafter may also be referred to as user equipment 110 or a UE 110) . The communication network 100 may further comprise a network device 120. The network device 120 may manage a cell 101. The terminal device 110 and the network device 120 may communicate data and control information to each other in the coverage of the cell. A link from the network device 120 to the terminal device 110 is referred to as a downlink (DL) , while a link from the terminal device 110 to the network device 120 is referred to as an uplink (UL) .
[0039] The terminal device 110 may be configured to perform the method implemented at a terminal device according to some embodiments of the present disclosure. The network device 120 may be configured to perform the method implemented at a network device according to some embodiments of the present disclosure.
[0040] It is to be understood that the number of network devices and terminal devices is only for the purpose of illustration without suggesting any limitations. The system 100 may include any suitable number of network devices and terminal devices adapted for implementing embodiments of the present disclosure. Although not shown, it would be appreciated that one or more terminal devices may be located in the environment 100.
[0041] The communications in the communication network 100 may conform to any suitable standards including, but not limited to, Global System for Mobile Communications (GSM) , LTE, LTE-Evolution, LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) , GSM EDGE Radio Access Network (GERAN) , Machine Type Communication (MTC) and the like. Furthermore, the communications may be performed according to any generation communication protocols either currently known or to be developed in the future. Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols and the sixth generation (6G) communication protocols.
[0042] As described hereinbefore, the SBFD is being specified in Rel-19 as a new mode of operation in unpaired spectrum where separate set of RBs within a TDD carrier are used for UL and DL transmission simultaneously. Only for illustrative purposes, a high-level comparison of an SBFD operation with a traditional TDD or FDD operation is illustrated in FIG. 2. As illustrated in FIG. 2, in the TDD or FDD operation, UL and DL transmissions are made either on different frequency resources or on different time domain resources, while different from the TDD or FDD operation, the SBFD operation (also called as flexible duplexing (FDU) ) may enable network to perform UL and DL transmissions simultaneously in separate sets of RBs within the same transmission resource.
[0043] A study item on the SBFD took place in Rel-18 in radio access network (RAN) 1 and RAN4 working groups, while the specification work started in R19 in RAN1 and is ongoing as of today. Some high-level principles on SBFD operation as agreed by RAN1 in the SI phase (TR 38.828) are as follows:
[0044] ■ Simultaneous transmission and reception (on non-overlapping set of RBs) is assumed at the gNB side, while half-duplex operation is assumed at the UE side. RAN1 is currently specifying UE behavior for handling collision and priorities between UL and DL channels.
[0045] ■ Only one UL subband, while one or at most two DL subbands are supported within a TDD carrier. These are commonly referred as DU (or UD) or DUD operation, respectively.
[0046] ■ An SBFD subband is defined as one or more consecutive RBs which are used for the same transmission direction (either UL or DL) .
[0047] ■ UL transmissions take place within UL subband only, while DL receptions take place within DL subband (s) only.
[0048] ■ SBFD-aware UE is used to refer to UE supporting (at least some) SBFD-related features to be standardized in Rel-19.
[0049] ■ As a baseline, it is assumed that both time and frequency locations of subbands for the SBFD operation are known to the SBFD-aware UE, while this information is not available for legacy (pre Rel-19) UE.
[0050] ■ Legacy UE is not aware of SBFD operation and thus behaves in similar manner as in today’s TDD system. The Rel-18 study concluded that non-SBFD aware UE (including legacy UE) and SBFD aware UE can coexist in cells with the SBFD operation at gNB side from RAN1 specification point of view.
[0051] For illustrative purposes, FIG. 3 illustrates an example arrangement of UL and DL resources for different types of SBFD operations. The SBFD operation may include a “UD” SBFD operation and a “DUD” SBFD operation as in FIG. 3. As illustrated in FIG. 3, SBFD symbols (or slots) may refer to those symbols (or slots) where SBFD operations are available, i.e., both a UL subdand and one or more DL subbands are simultaneously enabled; and non-SBFD symbols refer to (legacy) unidirectional symbols wherein SBFD operations are not available.
[0052] As illustrated in FIG. 3, in the “UD” SBFD operation, the top subband is configured as UL resources and the bottom subband is configured as the DL resources; in “DUD” SBFD operation, both the bottom and top subbands are configured as DL resources and the middle subband is configured as the UL resources. It is to be noted that the SBFD operation may also include a “DU” SBFD operation which differs from the “UD” SBFD operation Fig. 3A in that in “DU” SBFD operation, the top frequency band is DL subband and the bottom frequency band is UL subband.
[0053] In addition, different time-domain sequences were discussed by RAN1 in the TR 38.858. The time domain sequence may include e.g. “DXXXU” , “XXXXX” , “XXXXU, ” etc., where D, U, X respectively denote to downlink slot, uplink slot and SBFD slot. One slot may correspond to 14 OFDM symbols. One or more RBs may be used as a guard band between the UL and DL subbands to facilitate rejection of cross-link interference. Similarly, a guard time or period of one or more OFDM symbols may take place for the transition between different symbol / slot types.
[0054] Generally, the UE may perform reference signal based measurements on the DL transmission resources. For example, CSI-RS resources can be configured to UE for radio resource management (RRM) measurements. The UE performs measurements based on the CSI-RS resources on its serving cell as well as on neighbouring cells for different purposes. For example, the UE can be configured to perform CSI-RS based intra-frequency and inter-frequency measurements for mobility i.e. layer-3 (L3) measurements. It may also be configured with CSI-RS resources for layer-1 (L1) measurement e.g. L1-RSRP measurement and reporting. Example CSI-RS based UE measurements may include CSI reference signal received power (CSI-RSRP) , CSI reference signal received quality (CSI-RSRQ) , CSI signal to interference noise ratio (CSI-SINR) , L1-RSRP, etc.
[0055] RAN4 RRM specifications 3GPP TS 38.133 specify requirements in terms of the measurement period as well as the measurement accuracy that those measurements reporting shall fulfill. The measurement period requirement refers to a time period within which the UE shall be able to derive a qualified CSI-RS based measurement result. This time period is usually counted based on a number of samples of the reference signals. The measurement period may also depend on the periodicity of the CSI-RS signal, the UE DRX configuration, measurement gap configuration and / or whether the measurement is a L1 measurement or a L3 measurement, where the latter typically requires a longer measurement period compared to the L1 based measurement.
[0056] In addition, the measurement accuracy requirement is specified in Clause 10 of TS 38.133 in terms of absolute accuracy and relative accuracy and there are separate measurement accuracy requirements for different measurement types. One example for absolute accuracy requirement of CSI-RS based L1-RSRP measurement is shown in Fig. 4, wherein “Io” refers to the total received power density accounting for desired reference signal, interference and noise.
[0057] Generally, the accuracy requirement for each type of RRM measurement is subject to multiple conditions. For the example case of CSI-RS based L1-RSRP measurement and the CSI-RS based L3 measurement, the accuracy requirement is defined assuming the bandwidth of CSI-RS is 48 PRBs and the total received power density is 3. The performance with larger bandwidth of CSI-RS is equal to or better than the accuracy requirements specified in the specification e.g. TS 38.133 e.g.. Furthermore, additional side conditions are specified in Annex B of TS 38.133 and many of the side conditions apply to any RRM measurement including both SSB based and CSI-RS based measurements. For instance, some relaxation of the Io requirement is applied due to receiver sensitivity degradation when operating with Carrier aggregation.
[0058] In existing specifications (i.e. those prior to introducing support for SBFD operation) , CSI-RS resources were assumed to be contiguous in the frequency domain, i.e. the CSI-RS resources are defined by a start resource block (RB) and end RB (or a start RB and a length of RBs) . Now, with the upcoming introduction of SBFD operation, CSI-RS reference signals will be impacted as follows:
[0059] In RAN1#117, the following was agreed regarding CSI-RS resources on SBFD symbols:
[0060] Essentially, the above agreement means that CSI-RS configuration follows the legacy way (e.g., indicating start and end RBs, etc. ) , but only the CSI-RS resources in the DL subband are measured by the UE and used to derive the report (as noted in the third agreement above) . In other words, the CSI-RS resources in the UL subband and guardbands are assumed not to be present, i.e. “punctured” by the gNB.
[0061] As described aforesaid, the accuracy requirements for CSI-RS based measurements in current specifications assume that the bandwidth of CSI-RS resources is (at least) 48 PRBs and the total received power density is 3 and the CSI-RS resources (RBs) are contiguous in the frequency domain. However, the introduction of SBFD may entail that these existing conditions regarding CSI-RS measurement accuracy are not always fulfilled. Therefore, there is a need for determining CSI-RS measurement accuracy for the SBFD operation in the art.
[0062] In view of the above discussions, embodiments of the present disclosure provide an improved solution for CSI measurement and report in SBFD operation. In one aspect of the solution of the present disclosure, a terminal device receives a measurement configuration on a channel state information reference signal, CSI-RS, resources in a cell configured with a sub-band full duplex, SBFD, operation. The terminal device performs a measurement on the CSI-RS resources based on the measurement configuration and generate a measurement reporting based on the measurement. The measurement reporting is determined to meet a measurement accuracy requirement based on resources for the SBFD operation and the CSI-RS resources, and wherein the CSI-RS resources are non-contiguous in a frequency domain.
[0063] In this way, the terminal device (and similarly the network device) may determine whether and how the measurement report meets the CSI-RS measurement accuracy for the SBFD operation in an effective manner, thereby providing a feasible solution for CSI-RS based measurement and report in the SBFD operation, and addressing the issues on CSI-measurement and reporting related to the SBFD operation. Hereinafter, principles and implementations of embodiments of the present disclosure will be described in detail with reference to FIGS. 5 -10.
[0064] Reference will be first made to an example scenario as illustrated in FIG. 5 to describe principles and implementations of embodiments as proposed herein. It is to be noted that the example scenario is given only for illustrative purposes, the present disclosure is not limited thereto, and instead, the inventive concepts may be applied in any other SBFD scenarios, where non-contiguous CSI-RS sources are configured to UE.
[0065] As illustrated in FIG. 5, in the example scenario,
[0066] ■ The SBFD operation has a “DUD” configuration, where there is a UL subband surrounded by two DL subbands in frequency-domain.
[0067] ■ The configured CSI-RS resources span across the two DL subbands.
[0068] ■ The total number of RBs of the CSI-RS resources after pruning those CSI-RS RBs overlapping with UL subband and guardband (M + N) may satisfy the minimum requirement, such as 48 RBs as specified in 3GPP standards, although, the number of resources in each of DL subbands (M or N) may not satisfy the minimum requirement.
[0069] In addition, in the example scenario , M indicates the amount of CSI-RS resources within the bottom DL subband, i.e., DL subband #1, N indicates the amount of CSI-RS resources within the top DL subband, i.e., DL subband #2; and K indicates the amount of middle UL subband, or the amount of CSI-RS resources indicated in the CSI-RS resource and measurement configuration overlapped or within the UL subband.
[0070] However, it is to be noted that the above case is given only for example illustrative purposes, and embodiments may also be applied onto any other scenario wherein the CSI-RS resources are not contiguous in frequency domain. For example, the minimum requirement of resource blocks may also be other suitable value. In addition, although the CSI-RS reference signal is described as an example of reference signals for which the measurement accuracy is to be determined, the present application is not limited thereto, and instead, the solution as proposed herein may also be applied into other reference signal which involves similar issues.
[0071] Example Method
[0072] FIG. 6 illustrates an example signaling chart of an example process 600 according to some embodiments of the present disclosure. For the purpose of discussion, the example 600 will be described with reference to FIG. 1.
[0073] In the example process 600, the network device (such as gNB) 120 may transmit 610 to the terminal device (such as UE) 110 a CSI-RS resource and measurement configuration. The configuration of at least one CSI-RS resource may be for RRM measurement purposes and may indicate CSI-RS measurement types and CSI-RS resource. The RRM measurement may include L1 measurement, L3 measurement, etc. For example, the CSI measurement may include one of more of CSI-RSRP, CSI-RSRQ, CSI-SINR, L1-RSRP, or any other suitable measurement. The CSI-RS resource can be periodic, aperiodic or semi-persistent in time domain. The configuration of the CSI-RS resource may indicate location of CSI-RS resource, for example, the start and end RBs. The terminal device 110 receives the CSI-RS resource and measurement configuration, from which it may learn types of the RRM measurement to be performed, such as CSI-RSRP, CSI-RSRQ, CSI-SINR, L1-RSRP, etc. and the CSI-RS resources.
[0074] The network device (such as gNB) 120 may further transmit 620 to the terminal device 110 an SBFD resource indication or configuration. The SBFD resource indication or configuration may indicate the location of the SBFD resources in time and frequency-domain of the serving cell. It is to be noted that the CSI-RS resource and measurement configuration and the SBFD resource indication or configuration in time and frequency-domain may be transmitted in the same message or separate messages.
[0075] The terminal device 110 may receive the SBFD resource indication or configuration and determines 630 metrics related to the overlap of the CSI-RS resource with SBFD resources / symbols respectively, i.e., respective amounts of overlapped resources between the CSI-RS resource configuration and SBFD resources. In other words, the CSI resources within respective DL subbands and the resources of UL subband are determined based on the SBFD resource indication or configuration and a CSI-RS resource and measurement configuration.
[0076] As illustrated in FIG. 5, the terminal device 110 determines the values of M, N, K based on the CSI-RS resource and measurement configuration and the SBFD resource indication or configuration.
[0077] As described above, the CSI-RS resource and measurement configuration may indicate the start RB and the end RB of the CSI-RS (or indicate the set of RBs for CSI-RS in any suitable manner) , and the SBFD resource indication or configuration may indicate the location of the SBFD resources in time and frequency-domain of the serving cell, and thus based on these pieces of information, the values of M, N, and K may be determined accordingly.
[0078] Next, the terminal device 110 determines 640 that CSI-RS based measurement report shall meet the measurement accuracy requirement for the corresponding CSI-RS measurement based on the determined metrics related to overlap of the CSI-RS resource with SBFD resources / symbols. It is to be noted that although FIG. 6 illustrates that the determination is before the CSI-RS based measurement and measurement report generation, in practice, the determination may also be made after the CSI-RS based measurement and measurement report.
[0079] In some embodiments, the terminal device 110 may determine the accuracy it needs to comply for the respective CSI-RS measurement types based on e.g., the determined M, N, K values. In some embodiments, the terminal device 110 may further determine an adjustment value such as an offset factor, a margin value, a scaling factor or a relaxation value.
[0080] The terminal device 110 may receive CSI-RS at suitable occasions and performs CSI-RS measurements 650 according to the CSI-RS measurement configuration, and generate a measurement reporting, which may fulfill the determined accuracy requirements. The terminal device 110 then transmits 660 the generated measurement report to the network device 120.
[0081] It is to be noted that if the terminal device determines that the CSI-RS based measurement report shall meet the measurement accuracy requirement, it means the CSI-RS based measurement is valid, reliable and trustworthy. At the network device, the network device may make similar determination and learn whether the CSI-RS based measurement report shall meet the measurement accuracy requirement and in turn whether the measurement report provided by the terminal device is valid, reliable and trustworthy.
[0082] In addition, in determining whether the CSI-RS based measurement report shall meet the measurement accuracy requirements for the SBFD operation, there are different cases and options, which will be described with some example cases and options.
[0083] Example Cases and Options
[0084] Some embodiments of the present disclosure provide different cases and conditions in which
[0085] i) the existing accuracy requirement of CSI-RS based measurements shall apply,
[0086] ii) the measurement accuracy requirement of CSI-RS based measurements applies but with an additional margin / offset or relaxation to the requirement.
[0087] iii) the measurement accuracy requirement of CSI-RS based measurements should not apply and / or
[0088] Specifically, for i) , some embodiments propose conditions for the SBFD operation where the existing accuracy requirement, i.e., accuracy requirement for non-SBFD operation, shall apply; for ii) , some embodiments propose conditions for the SBFD operation where an additional adjustment value shall be applied to the existing accuracy requirement. For iii) , some embodiments propose that when any of the proposed conditions are not met, the UE may not apply the measurement accuracy requirement of CSI-RS based measurements. Next, description will be mainly made to conditions i) and ii) to describe example cases and options for determining the measurement accuracy requirements for the SBFD operation.
[0089] In some embodiments of the present disclosure, the following example cases and options may be defined.
[0090] ■ Case A
[0091] In some embodiments, if there is a contiguous set of 48 RBs in one of the DL subbands for CSI-RS, the terminal device 110 may determine that the existing CSI-RS based performance requirements apply. The existing CSI-RS based measurement accuracy requirements may refer to the CSI-RS based measurement accuracy requirements for non-SBFD operation as specified in the current 3GPP specification.
[0092] In other words, if it is determined that any of N or M >=48, the existing CSI-RS based measurement accuracy requirements apply.
[0093] ■ Case B
[0094] In some embodiments, the total number of CSI-RS RBs for the SBFD is equal or greater than 48 and the CSI-RS RBs are not contiguous in frequency domain, and in such a case, there may be different options. In other words, the total number of CSI-RS RBs within DL subbands is equal to or larger than 48, for example when M+N>=48 and N<48 and M<48.
[0095] Option 1
[0096] In some embodiments, the terminal device 110 may directly determine that the existing CSI-RS based measurement accuracy requirements apply if the total number of CSI-RS RBs on DL subbands is equal or greater than 48 but the CSI-RS RBs are not contiguous in frequency domain, i.e., if M+N>=48. For example, the terminal device 110 may determine that the existing CSI-RS based measurement accuracy requirements apply if M+N>=48, N<48 and M<48.
[0097] Option 2
[0098] In some embodiments, if the total number of CSI-RS RBs on DL subbands is equal to or greater than 48, but the CSI-RS RBs are not contiguous in frequency domain (for example when M+N>=48 AND N<48 AND M<48) , the terminal device 110 may determine that the existing CSI-RS based measurement accuracy requirements apply if one or more following conditions are further met:
[0099] ○ Option 2-A: If the size of the punctured resources K in UL subband is within a threshold X1 (e.g. K is smaller or equal to a certain number of RBs i.e. K<=X1) , or if the frequency gap between the respective CSI-RS resources in each DL subband is within a threshold X1. The reasoning lies in that CSI-RS measurement accuracy would not be compromised if the gap between the N and M CSI-RS RBs is small enough.
[0100] ○ Option2-B: The ratio CSI-RS resources within DL subbands (N+M) vs punctured resources in UL subband (K) meets a certain threshold X2, e.g. (N+M) / K >= X2. For example, set X2 = 1, the measurement accuracy requirements would not apply for {N=20, M=30, K=55} , but would apply if {N=30, M=30, K=55} .
[0101] ○ Option 2-C: The ratio CSI-RS resources within each DL subband (M, N) vs punctured resources in UL subband (K) meets a certain threshold X3, e.g. N / K >= X3 AND M / K >= X3.
[0102] ○ Option 2-D: The number of CSI-RS resources in each DL subband is equal or higher than a certain threshold X4 (i.e. N>=X4 AND M>=X4) . One example value for X4 could be 30 RBs, which means more relaxed requirement than the existing minimum requirement of 48 RBs)
[0103] The reasoning for Options 2-C and 2-D lies in that CSI-RS measurement accuracy can only be achieved if the number of consecutive resources in each of the subbands has sufficient large bandwidth. For example, a better accuracy may be achieved when assuming N=24 and M=24, compared to assuming N=40 and M = 8. Therefore, Option 2-C and 2-D may be used as further conditions for determining the measurement accuracy requirements.
[0104] It is to be noted that conditions specified under Options 2-A-2-D are described only for illustrative purposes and the present disclosure is not limited thereto. It is also possible to define these conditions in an inverse manner, e.g. Option 2-C may be defined as the ratio of resources of UL subband (K) to the CSI resources within DL subbands (M, N) to be lower than a certain threshold X5, i.e. K / N <X5 and K / M <X5.
[0105] Option 3
[0106] In some embodiments, an adjustment value Δ may be determined and then applied in determining the measurement accuracy requirements. The adjustment value may comprise any of an additional margin, an offset value, a scaling factor or a relaxation value to the existing? measurement accuracy requirements.
[0107] The adjustment value Δ may be calculated in different ways and some example solutions are given as follows.
[0108] ○ The adjustment value Δ may be a pre-defined value (e.g. 3dB) if the CSI-RS resource to be measured is not contiguous on frequency domain. Optionally, the adjustment value Δ may be applied when any of the conditions in Option 2 in Case B is fulfilled.
[0109] ○ The adjustment value Δ may be indicated by UE capability. The adjustment value Δ may represent how much the UE is able to compensate the measurement performance loss on the non-contiguous CSI-RS resource due to SBFD operation. Therefore, for UE with different capabilities, the adjustment value may be different.
[0110] ○ The adjustment value Δ may be calculated based on one or more of N, M, and K. instead of a constant value, the adjustment value Δ may depend on the configured CSI resources and the configured SBFD resources, to fully consider the impact of non-contiguous CSI-RS resources on the CSI-RS measurement accuracy requirement due to the SBFD operations.
[0111] In some embodiments, the adjustment value Δ may apply to one or more of the actual absolute / relative accuracy requirement, e.g. ± 5 dB, according to the table illustrated in FIG. 4) . In some embodiments, the adjustment value Δ may apply to the Io conditions or to the minimum or maximum CSI-RS received power requirement that the UE is expected to measure.
[0112] In some embodiments, different adjustment values Δ may be applied to different measurement accuracy requirements for respective measurement types. For example, there might be separate adjustment values for CSI-RSRP, CSI-RSRQ, CSI-SINR, L1-RSRP, etc., although some of them may have the same value. In addition, it is also possible that some of measurement types may have separate adjustment values, and some of them use the same adjustment value.
[0113] Option 4
[0114] Some embodiments of the present disclosure provide new accuracy requirements (e.g. a new table in specifications) , which applies for the SBFD operation when CSI-RS is split across two or more DL subbands. This allows to specify different values in terms of CSI-RS measurement accuracy in SBFD symbols compared to those in existing specifications. The new accuracy requirements may be contained in a new table separated from the existing table for the measurement accuracy requirement of CSI-RS based measurements, or may be extended items in the existing table for the measurement accuracy requirement of CSI-RS based measurements. These new accuracy requirements may be determined based on for example Option 3 or 4.
[0115] In addition, it is to be note that conditions specified under Options 2-A-2-D are described for illustrative purposes and the present disclosure is not limited thereto. Moreover, it does mean each of Options 2-A-2-D shall be applied either; instead, in practice, the terminal device may use more or less conditions than Options 2-A to 2-D, and Options 2-A to 2-D may be also used separately or in any combination thereof. And, any of these conditions or their combination can be also applied to Options 3 and 4 too.
[0116] Hereinafter, only for illustration purposes, example changes to the 3GPP standards are provided hereinafter for ease understanding of embodiments of the present disclosure. However, it is to be noted that these modifications are only given as examples for illustrative purposes and the present disclosure is not limited thereto.
[0117] EXAMPLE 1:
[0118] In some embodiments, the following underlined text may be added to 3GPP S 38.133 as follows:
[0119] “10.1.2.3.1 Absolute CSI-RSRP Accuracy
[0120] Unless otherwise specified, the requirements for absolute accuracy of CSI-RSRP in this clause apply to a cell where the CSI-RS resources to be measured have the same center frequency as the CSI-RS resources indicated for measurement in the serving cell in FR1.
[0121] The accuracy requirements in Table 10.1.2.3.1-1 are valid under the following conditions:
[0122] - Conditions defined in clause 7.3 of TS 38.101-1
[0018] for reference sensitivity are fulfilled.
[0123] - Conditions for intra-frequency measurements are fulfilled according to Annex B. 2.2 for a corresponding Band for each associated SSB.
[0124] - Conditions for intra-frequency measurements are fulfilled according to Annex B. 2.8 for a corresponding Band for each relevant CSI-RS to be measured.
[0125] - The bandwidth of CSI-RS is 48 PRBs and the density is 3.
[0126] - The residual bandwidth of CSI-RS within DL subbands is 48 PRBs and the density is 3, provided CSI-RS resource is non-contiguous in SBFD operation.
[0127] The performance with larger bandwidth of CSI-RS is equal to or better than the accuracy requirements in Table 10.1.2.3.1-1. -The timing offset between the reference measurement timing and the target CSI-RS in one layer is no larger than CP.
[0128] Note: The reference measurement timing for one layer for intra-frequency measurement is serving cell timing. ”
[0129] In Example 1, it is proposed to newly add a condition for the measurement accuracy requirement, i.e., “the residual bandwidth of CSI-RS within DL subbands is 48 PRBs and the density is 3, provided CSI-RS resource is non-contiguous in SBFD operation” in TS 38.133. In other words, in addition to the existing conditions, a new condition for SBFD operation is newly added.
[0130] EXAMPLE 2:
[0131] In some embodiments, the following underlined text may be added to 3GPP S 38.133 as follows:
[0132] "10.1.2.3.1 Absolute CSI-RSRP Accuracy
[0133] Unless otherwise specified, the requirements for absolute accuracy of CSI-RSRP in this clause apply to a cell where the CSI-RS resources to be measured have the same center frequency as the CSI-RS resources indicated for measurement in the serving cell in FR1.
[0134] The accuracy requirements in Table 10.1.2.3.1-1 are valid under the following conditions:
[0135] - Conditions defined in clause 7.3 of TS 38.101-1
[0018] for reference sensitivity are fulfilled.
[0136] - Conditions for intra-frequency measurements are fulfilled according to Annex B. 2.2 for a corresponding Band for each associated SSB.
[0137] - Conditions for intra-frequency measurements are fulfilled according to Annex B. 2.8 for a corresponding Band for each relevant CSI-RS to be measured.
[0138] - The bandwidth of CSI-RS is 48 PRBs and the density is 3.
[0139] - The residual bandwidth of CSI-RS within DL subbands is 48 PRBs and the density is 3, provided CSI-RS resource is non-contiguous in SBFD operation, and bandwidth of UL subbands is within X PRBs.
[0140] The performance with larger bandwidth of CSI-RS is equal to or better than the accuracy requirements in Table 10.1.2.3.1-1. -The timing offset between the reference measurement timing and the target CSI-RS in one layer is no larger than CP.
[0141] Note: The reference measurement timing for one layer for intra-frequency measurement is serving cell timing. ”
[0142] In Example 2, it is proposed to newly add a condition for the measurement accuracy requirement, i.e., “the residual bandwidth of CSI-RS within DL subbands is 48 PRBs and the density is 3, provided CSI-RS resource is non-contiguous in SBFD operation, and bandwidth of UL subbands is within X PRBs” in TS 38.133. In other words, in addition to the existing conditions, another new condition for SBFD operation is newly added.
[0143] EXAMPLE 3:
[0144] Table 10.1.2.3.1-1: CSI-RSRP Intra frequency absolute accuracy in FR1
[0145] In Example 3, the table for CSI-RSRP Intra frequency absolute accuracy in FR1 is modified so as to cover the measurement accuracy requirement for both the SBFD operation and the non-SBFD operation, and an adjustment value is applied for the SBFD operation. For other measurement accuracy requirements such as for the relative accuracy or other measurement type, similar modifications may be made to the corresponding tables.
[0146] It is to be noted that the above examples are given only for illustrative purposes, and it may also add any of other conditions as described above. In addition, it is also possible to introduce totally new tables of measurement accuracy requirements for the SBFD operations, separated from those of the non-SBFD.
[0147] Hereinafter, reference will be made to FIG. 7 and FIG. 8 to describe the operations at the terminal device or the network device respectively.
[0148] FIG. 7 illustrates a flowchart of a method implemented at a terminal device 110 according to some embodiments of the present disclosure. In some embodiments, the method 700 can be implemented at a communication device, such as the terminal device 110 as shown in FIG. 1.
[0149] Further, it is to be understood that the method 700 may include additional blocks not shown and / or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard. For the purpose of discussion, the method 700 will be described from the perspective of the terminal device 110 with reference to FIG. 1.
[0150] As illustrated in FIG. 7, at block 710, the terminal device 110 receives a measurement configuration on a channel state information reference signal, CSI-RS, resources in a cell configured with a sub-band full duplex, SBFD, operation.
[0151] At block 720, the terminal device 110 performs a measurement on the CSI-RS resources based on the measurement configuration and generate a measurement reporting based on the measurement. The measurement reporting is determined to meet a measurement accuracy requirement based on resources for the SBFD operation and the CSI-RS resources, and wherein the CSI-RS resources are non-contiguous in a frequency domain.
[0152] In some embodiments of the present disclosure, the measurement reporting may be determined to meet the measurement accuracy requirement based on one or more of: amounts of the CSI-RS resources respectively within one or more of at least two downlink, DL, subbands (e.g., M, N) and a resource amount of uplink UL subband (e.g., K) for the SBFD operation in the frequency domain, which are determined based on the resources for the SBFD operation and the CSI-RS resources.
[0153] In some embodiments of the present disclosure, the CSI-RS resources within at least one of the at least two DL subbands may have an amount of resources equal to or higher than a first predetermined threshold (e.g. 48 RBs) , and the measurement accuracy requirement may be determined based on a measurement accuracy requirement for CSI-RS for non-SBFD operation.
[0154] In some embodiments of the present disclosure, a total amount of the CSI-RS resources within at least two DL subbands for the SBFD operation (e.g., M+N) may be equal to or higher than a first predetermined threshold (e.g. 48 RBs) , and the measurement accuracy requirement may be determined based on a measurement accuracy requirement for CSI-RS for non-SBFD operation.
[0155] In some embodiments of the present disclosure, the total amount of the CSI-RS resources within at least two DL subbands for the SBFD operation (e.g, M+N) may be equal to or higher than a first predetermined threshold, and the measurement accuracy requirement may be determined based on a measurement accuracy requirement for CSI-RS for non-SBFD operation when one or more of following conditions are met:
[0156] ■ an amount of resources of an UL subband for the SBFD operation (e.g., K) is equal to or lower than a second predetermined threshold (e.g., X1) , or a resource gap between CSI-RS resources in respective DL subbands is within a third predetermined threshold (X1’) ;
[0157] ■ a ratio of a total amount of the CSI-RS resources within at least two DL subbands for the SBFD operation (e.g., M+N) to an amount of resources of an UL subband (e.g., K) for the SBFD operation is equal to or higher than a fourth predetermined threshold (e.g., X2) ;
[0158] ■ ratios of respective amounts of the CSI-RS resources within at least two DL subbands for the SBFD operation (e.g., M, N) to the amount of resources of the UL subband for the SBFD operation (e.g., K) are equal to or higher than a fifth predetermined threshold (e.g., X3) ; or
[0159] ■ respective amounts of the CSI-RS resources within at least two DL subbands for the SBFD operation (e.g., M, N) are equal to or higher than a sixth predetermined threshold (X4) .
[0160] In some embodiments of the present disclosure, wherein the measurement accuracy requirement may be determined further based on an adjustment value (e.g., Δ) . For example, the adjustment value may be applied in determining the measurement accuracy requirement.
[0161] In some embodiments of the present disclosure, the adjustment value may comprise one or more of an offset value, a margin value, a scaling factor, or a relaxation value. The adjustment value is applied onto one or more of an absolute accuracy requirement, a relative accuracy requirement, a total received power density condition or a minimum CSI-RS received power requirement, or maximum CSI-RS received power requirement.
[0162] In some embodiments of the present disclosure, the adjustment value may comprise any of a predefined value, a value indicated by UE capability, and a value determined based on one or more of amounts of the CSI resources within respective DL subbands and a resource amount of UL subband for the SBFD operation.
[0163] In some embodiments of the present disclosure, the adjustment value may comprise multiple values respectively for different measurement types.
[0164] In some embodiments of the present disclosure, the measurement accuracy requirement may be determined based on a predetermined CSI-RS based measurement accuracy table. The predetermined CSI-RS based measurement accuracy table may be dedicated to the SBFD operation, or the predetermined CSI-RS based measurement accuracy table may contain CSI-RS based measurement accuracy requirements both for the SBFD operation and a non-SBFD operation.
[0165] FIG. 9 illustrates a flowchart of a method implemented at a network device according to some embodiments of the present disclosure. In some embodiments, the method 800 can be implemented at a communication device, such as the network device 120 as shown in FIG. 1.
[0166] Further, it is to be understood that the method 800 may include additional blocks not shown and / or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard. For the purpose of discussion, the method 800 will be described from the perspective of the network device 120 with reference to FIG. 1.
[0167] At block 810, the network device 120 transmits a measurement configuration on a channel state information reference signal, CSI-RS, resources in a cell configured with a sub-band full duplex, SBFD, operation.
[0168] At block 820, the network device 120 receives a measurement reporting of CSI-RS for the SBFD operation. The measurement reporting is determined to meet a measurement accuracy requirement determined based on resources for the SBFD operation and the CSI-RS resources, and wherein the CSI-RS resources are non-contiguous in a frequency domain.
[0169] In some embodiments of the present disclosure, the measurement reporting may be determined to meet the measurement accuracy requirement based on one or more of: amounts of the CSI-RS resources respectively within one or more of at least two downlink, DL, subbands (e.g., M, N) and a resource amount of uplink UL subband (e.g., K) for the SBFD operation in the frequency domain, which are determined based on the resources for the SBFD operation and the CSI-RS resources.
[0170] In some embodiments of the present disclosure, the CSI-RS resources within at least one of the at least two DL subbands may have an amount of resources equal to or higher than a first predetermined threshold (e.g. 48 RBs) , and the measurement accuracy requirement may be determined based on a measurement accuracy requirement for CSI-RS for non-SBFD operation.
[0171] In some embodiments of the present disclosure, a total amount of the CSI-RS resources within at least two DL subbands for the SBFD operation (e.g., M+N) may be equal to or higher than a first predetermined threshold (e.g. 48 RBs) , and the measurement accuracy requirement may be determined based on a measurement accuracy requirement for CSI-RS for non-SBFD operation.
[0172] In some embodiments of the present disclosure, the total amount of the CSI-RS resources within at least two DL subbands for the SBFD operation (e.g, M+N) may be equal to or higher than a first predetermined threshold, and the measurement accuracy requirement may be determined based on a measurement accuracy requirement for CSI-RS for non-SBFD operation when one or more of following conditions are met:
[0173] ■ an amount of resources of an UL subband for the SBFD operation (e.g., K) is equal to or lower than a second predetermined threshold (e.g., X1) , or a resource gap between CSI-RS resources in respective DL subbands is within a third predetermined threshold (X1’) ;
[0174] ■ a ratio of a total amount of the CSI-RS resources within at least two DL subbands for the SBFD operation (e.g., M+N) to an amount of resources of an UL subband (e.g., K) for the SBFD operation is equal to or higher than a fourth predetermined threshold (e.g., X2) ;
[0175] ■ ratios of respective amounts of the CSI-RS resources within at least two DL subbands for the SBFD operation (e.g., M, N) to the amount of resources of the UL subband for the SBFD operation (e.g., K) are equal to or higher than a fifth predetermined threshold (e.g., X3) ; or
[0176] ■ respective amounts of the CSI-RS resources within at least two DL subbands for the SBFD operation (e.g., M, N) are equal to or higher than a sixth predetermined threshold (X4) .
[0177] In some embodiments of the present disclosure, wherein the measurement accuracy requirement may be determined further based on an adjustment value (e.g., Δ) . For example, the adjustment value may be applied in determining the measurement accuracy requirement.
[0178] In some embodiments of the present disclosure, the adjustment value may comprise one or more of an offset value, a margin value, a scaling factor, or a relaxation value. The adjustment value is applied onto one or more of an absolute accuracy requirement, a relative accuracy requirement, a total received power density condition or a minimum CSI-RS received power requirement, or maximum CSI-RS received power requirement.
[0179] In some embodiments of the present disclosure, the adjustment value may comprise any of a predefined value, a value indicated by UE capability, and a value determined based on one or more of amounts of the CSI resources within respective DL subbands and a resource amount of UL subband for the SBFD operation.
[0180] In some embodiments of the present disclosure, the adjustment value may comprise multiple values respectively for different measurement types.
[0181] In some embodiments of the present disclosure, the measurement accuracy requirement may be determined based on a predetermined CSI-RS based measurement accuracy table. The predetermined CSI-RS based measurement accuracy table may be dedicated to the SBFD operation, or the predetermined CSI-RS based measurement accuracy table may contain CSI-RS based measurement accuracy requirements both for the SBFD operation and a non-SBFD operation.
[0182] EXAMPLE APPARATUS
[0183] FIG. 9 illustrates a simplified block diagram of a device 900 that is suitable for implementing embodiments of the present disclosure. The device 900 can be considered as a further example implementation of the terminal device 110 or a further example implementation of the network device 120 as shown in FIG. 1. Accordingly, the device 900 can be implemented at or as at least a part of the network device 120.
[0184] As shown, the device 900 includes a processor 910, a memory 920 coupled to the processor 910, a suitable transmitter (TX) and receiver (RX) 940 coupled to the processor 910, and a communication interface coupled to the TX / RX 940. The memory 920 stores at least a part of a program 930. The TX / RX 940 is for bidirectional communications. The TX / RX 940 has at least one antenna to facilitate communication, though in practice an Access Node mentioned in this disclosure may have several ones. The communication interface may represent any interface that is necessary for communication with other network elements, such as X2 interface for bidirectional communications between eNBs or gNBs, S1 interface for communication between a Mobility Management Entity (MME) / Serving Gateway (S-GW) and the eNB or gNB, Un interface for communication between the eNB or gNB and a relay node (RN) , or Uu interface for communication between the eNB or gNB and a terminal device.
[0185] The program 930 is assumed to include program instructions that, when executed by the associated processor 910, enable the device 900 to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to FIGS. 1-9. The 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 embodiments of the present disclosure. Furthermore, a combination of the processor 910 and memory 920 may form processing means 950 adapted to implement various embodiments of the present disclosure.
[0186] 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.
[0187] In some embodiments, an apparatus capable of performing the method 700 (for example, the terminal device 110) may comprise means for performing the respective steps of the method 700. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module. In some embodiments, the means comprises at least one processor and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the performance of the method 700.
[0188] In some embodiments, an apparatus capable of performing the method 800 (for example, the network device 120) may comprise means for performing the respective steps of the method 800. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module. In some embodiments, the means comprises at least one processor and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the performance of the method 800.
[0189] Generally, various 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 embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representation, it will be appreciated that the blocks, apparatus, systems, techniques or methods 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.
[0190] 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 process or method as described above. 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 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.
[0191] 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.
[0192] The above program code may be embodied on a machine readable medium, which may be any tangible medium that may contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine readable medium may be a machine readable signal medium or a machine readable storage medium. A machine 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 machine 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) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
[0193] 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 embodiments. Certain features that are described in the context of separate 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 embodiments separately or in any suitable sub-combination.
[0194] Although the present disclosure has been described in language 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.
Claims
1.A terminal device comprising:one or more transceivers; andone or more processors coupled to the one or more transceivers, and the one or more transceivers are configured with the one or more processor to cause the network device to:receive a measurement configuration on a channel state information reference signal, CSI-RS, resources in a cell configured with a sub-band full duplex, SBFD, operation; andperform a measurement on the CSI-RS resources based on the measurement configuration and generate a measurement reporting based on the measurement,wherein the measurement reporting is determined to meet a measurement accuracy requirement based on resources for the SBFD operation and the CSI-RS resources, and wherein the CSI-RS resources are non-contiguous in a frequency domain.2.The terminal device of Claim 1, wherein the measurement reporting is determined to meet the measurement accuracy requirement based on one or more of amounts of the CSI-RS resources respectively within one or more of at least two downlink, DL, subbands and a resource amount of uplink UL subband for the SBFD operation in the frequency domain which are determined based on the resources for the SBFD operation and the CSI-RS resources.3.The terminal device of Claim 1 or 2, wherein the CSI-RS resources within at least one of the at least two DL subbands have an amount of resources equal to or higher than a first predetermined threshold, andwherein the measurement accuracy requirement is determined based on a measurement accuracy requirement for CSI-RS for non-SBFD operation.4.The terminal device of Claim 1 or 2, wherein a total amount of the CSI-RS resources within at least two DL subbands for the SBFD operation is equal to or higher than a first predetermined threshold, andwherein the measurement accuracy requirement is determined based on a measurement accuracy requirement for CSI-RS for non-SBFD operation.5.The terminal device of Claim 1 or 2, wherein the total amount of the CSI-RS resources within at least two DL subbands for the SBFD operation is equal to or higher than a first predetermined threshold, andwherein the measurement accuracy requirement is determined based on a measurement accuracy requirement for CSI-RS for non-SBFD operation when one or more of following conditions are met:an amount of resources of an UL subband for the SBFD operation is equal to or lower than a second predetermined threshold, or a resource gap between CSI-RS resources in respective DL subbands is within a third predetermined threshold;a ratio of a total amount of the CSI-RS resources within at least two DL subbands for the SBFD operation to an amount of resources of an UL subband for the SBFD operation is equal to or higher than a fourth predetermined threshold;ratios of respective amounts of the CSI-RS resources within at least two DL subbands for the SBFD operation to the amount of resources of the UL subband for the SBFD operation are equal to or higher than a fifth predetermined threshold; orrespective amounts of the CSI-RS resources within at least two DL subbands for the SBFD operation are equal to or higher than a sixth predetermined threshold.6.The terminal device of Claim 4 or 5, wherein the measurement accuracy requirement is determined further based on an adjustment value, and wherein the adjustment value is applied in determining the measurement accuracy requirement.7.The terminal device of Claim 6, wherein the adjustment value comprises one or more of an offset value, a margin value, a scaling factor, or a relaxation value, andwherein the adjustment value is applied onto one or more of an absolute accuracy requirement, a relative accuracy requirement, a total received power density condition or a minimum CSI-RS received power requirement, or maximum CSI-RS received power requirement.8.The terminal device of Claim 6 or 7, wherein the adjustment value comprises any ofa predefined value,a value indicated by UE capability, anda value determined based on one or more of amounts of the CSI resources within respective DL subbands and a resource amount of UL subband for the SBFD operation.9.The terminal device of Claim 6, wherein the adjustment value comprises multiple values respectively for different measurement types.10.The terminal device of Claim 1, wherein the measurement accuracy requirement is determined based on a predetermined CSI-RS based measurement accuracy table, wherein the predetermined CSI-RS based measurement accuracy table is dedicated to the SBFD operation, or the predetermined CSI-RS based measurement accuracy table contains CSI-RS based measurement accuracy requirements both for the SBFD operation and a non-SBFD operation.11.A network device, comprising:one or more transceivers; andone or more processors coupled to the one or more transceivers, and the one or more transceivers are configured with the one or more processor to cause the network device to:transmit a measurement configuration on a channel state information reference signal, CSI-RS, resources in a cell configured with a sub-band full duplex, SBFD, operation; andreceive a measurement reporting of CSI-RS for the SBFD operation,wherein the measurement reporting is determined to meet a measurement accuracy requirement determined based on resources for the SBFD operation and the CSI-RS resources, and wherein the CSI-RS resources are non-contiguous in a frequency domain.12.The network device of Claim 11, wherein the measurement reporting is determined to meet the measurement accuracy requirement based on one or more of amounts of the CSI-RS resources respectively within one or more of at least two downlink, DL, subbands and a resource amount of uplink UL subband for the SBFD operation in the frequency domain which are determined based on the resources for the SBFD operation and the CSI-RS resource.13.The network device of Claim 11 or 12, wherein the CSI-RS resources within at least one of the at least two DL subbands have an amount of resources equal to or higher than a first predetermined threshold, andwherein the measurement accuracy requirement is determined based on a measurement accuracy requirement for CSI-RS for non-SBFD operation.14.The network device of Claim 11 or 12, wherein a total amount of the CSI-RS resources within at least two DL subbands for the SBFD operation is equal to or higher than a first predetermined threshold, andwherein the measurement accuracy requirement is determined based on a measurement accuracy requirement for CSI-RS for non-SBFD operation.15.The network device of Claim 11 or 12, wherein the total amount of the CSI-RS resources within at least two DL subbands for the SBFD operation is equal to or higher than a first predetermined resource amount threshold, andwherein the measurement accuracy requirement is determined based on a measurement accuracy requirement for CSI-RS for non-SBFD operation when one or more of following conditions are met:an amount of resources of an UL subband for the SBFD operation is equal to or lower than a second predetermined threshold, or a resource gap between CSI-RS resources in respective DL subbands is within a third predetermined threshold;a ratio of a total amount of the CSI-RS resources within at least two DL subbands for the SBFD operation to an amount of resources of an UL subband for the SBFD operation is equal to or higher than a fourth predetermined threshold;ratios of respective amounts of the CSI-RS resources within at least two DL subbands for the SBFD operation to the amount of resources of the UL subband for the SBFD operation are equal to or higher than a fifth predetermined threshold; orrespective amounts of the CSI-RS resources within at least two DL subbands for the SBFD operation are equal to or higher than a sixth predetermined threshold.16.The network device of Claim 14 or 15, wherein the measurement accuracy requirement is determined further based on an adjustment value, and wherein the adjustment value is applied in determining the measurement accuracy requirement.17.The network device of Claim 16, wherein the adjustment value comprises one or more of an offset value, a margin value, a scaling factor, or a relaxation value, andwherein the adjustment value is applied onto one or more of an absolute accuracy requirement, a relative accuracy requirement, a total received power density condition or a minimum CSI-RS received power requirement, or maximum CSI-RS received power requirement.18.The network device of Claim 16 or 17, wherein the adjustment value comprises any ofa predefined value,a value indicated by UE capability, anda value determined based on one or more of amounts of the CSI resources within respective DL subbands and a resource amount of UL subband for the SBFD operation.19.The network device of Claim 16, wherein the adjustment value comprises multiple values respectively for different measurement types.20.The network device of Claim 11, wherein the measurement accuracy requirement is determined based on a predetermined CSI-RS based measurement accuracy table, wherein the predetermined CSI-RS based measurement accuracy table is dedicated to the SBFD operation, or the predetermined CSI-RS based measurement accuracy table contains CSI-RS based measurement accuracy requirements both for the SBFD operation and a non-SBFD operation.21.A method performed by a terminal device, comprising:receiving a measurement configuration on a channel state information reference signal, CSI-RS, resources in a cell configured with a sub-band full duplex, SBFD, operation; andperforming a measurement on the CSI-RS resources based on the measurement configuration and generate a measurement reporting based on the measurement,wherein the measurement reporting is determined to meet a measurement accuracy requirement determined based on resources for the SBFD operation and the CSI-RS resources, and wherein the CSI-RS resources are non-contiguous in a frequency domain.22.A method performed by a network device, comprising:transmitting a measurement configuration on a channel state information reference signal, CSI-RS, resources in a cell configured with a sub-band full duplex, SBFD, operation; andreceiving a measurement reporting of CSI-RS for the SBFD operation,wherein the measurement reporting is determined to meet a measurement accuracy requirement determined based on resources for the SBFD operation and the CSI-RS resources, and wherein the CSI-RS resources are non-contiguous in a frequency domain.23.An apparatus of terminal device comprising:means for receiving a measurement configuration on a channel state information reference signal, CSI-RS, resources in a cell configured with a sub-band full duplex, SBFD, operation; andmeans for performing a measurement on the CSI-RS resources based on the measurement configuration and generate a measurement reporting based on the measurement,wherein the measurement reporting is determined to meet a measurement accuracy requirement determined based on resources for the SBFD operation and the CSI-RS resources, and wherein the CSI-RS resources are non-contiguous in a frequency domain.24.An apparatus of network device comprising:means for transmitting a measurement configuration on a channel state information reference signal, CSI-RS, resources in a cell configured with a sub-band full duplex, SBFD, operationmeans for receiving a measurement reporting of CSI-RS for the SBFD operation,wherein the measurement reporting is determined to meet a measurement accuracy requirement determined based on resources for the SBFD operation and the CSI-RS resources, and wherein the CSI-RS resources are non-contiguous in a frequency domain.25.A terminal device, comprising:at least one processor; andat least one memory including computer program codes, wherein the at least one memory and the computer program codes are configured to, with the at least one processor, cause the terminal device to:receive a measurement configuration on a channel state information reference signal, CSI-RS, resourced in a cell configured with a sub-band full duplex, SBFD, operation; andperform a measurement on the CSI-RS resourced based on the measurement configuration and generate a measurement reporting based on the measurement,wherein the measurement reporting is determined to meet a measurement accuracy requirement determined based on resources for the SBFD operation and the CSI-RS resourced, and wherein the CSI-RS resourced are non-contiguous in a frequency domain.26.A network device, comprising:at least one processor; andat least one memory including computer program codes, wherein the at least one memory and the computer program codes are configured to, with the at least one processor, cause the network device to:transmit a measurement configuration on a channel state information reference signal, CSI-RS, resources in a cell configured with a sub-band full duplex, SBFD, operationreceive a measurement reporting of CSI-RS for the SBFD operation,wherein the measurement reporting is determined to meet a measurement accuracy requirement determined based on resources for the SBFD operation and the CSI-RS resources, and wherein the CSI-RS resources are non-contiguous in a frequency domain.27.A non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the method of Claims 21 or 22.
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