Method and equipment for dynamic self-adaption of space elements

Abstract

The embodiment of the invention relates to a method and equipment for dynamic self-adaption of space elements. According to one embodiment of the present application, an exemplary method comprises: receiving at least one first signaling indicating a first set of resource elements of a CSI-RS; receiving at least one second signaling indicating antenna port related information; and determining at least one of a second set of resource elements of the CSI-RS, an application time of the antenna port related information, or a set of CSI reference resources based on at least one of the at least one first signaling or the at least one second signaling.

Description

Technical Field

[0001] Embodiments of the present application generally relate to wireless communication technology, and more particularly, to a method and apparatus for dynamic adaptation of spatial elements. Background Art

[0002] Wireless communication systems are widely deployed to provide various telecommunication services, such as telephony, video, data, messaging, broadcast, etc. Wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of wireless communication systems may include fourth generation (4G) systems, such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems, which may also be referred to as new radio (NR) systems. However, wireless communication systems still need to evolve in pursuit of better quality of service, better service experience, and lower cost.

[0003] For example, regarding the spatial elements in a wireless communication system, they generally include antenna elements, transmit (Tx) radio units (RUs) (with subarrays / full connections), antenna panels, transmit receive points (TRxPs) (co-located or geographically separated from each other), and logical antenna ports (corresponding to specific signals and channels, also called logical ports or antenna ports), etc. According to the RAN1#109e protocol, it is necessary to further study the adaptive technology and enhancement of spatial elements, which include but are not limited to the following aspects:

[0004] The impact of dynamic adaptation of spatial elements on user equipment (UE) operations, such as measurement, channel state information (CSI) feedback, power control, physical uplink shared channel (PUSCH) / physical downlink shared channel (PDSCH) repetition, sounding reference signal (SRS) transmission, transmission configuration indication (TCI) configuration, beam management, beam failure recovery, radio link monitoring, cell (re)selection, handover, initial access, etc.

[0005] ● a signaling method for implementing dynamic spatial element adaptation, including reduced signaling;

[0006] ■ For example, group common layer 1 (L1) signaling, broadcast signaling, medium access control (MAC) control element (CE), etc.

[0007] ●Dynamic logical port adaptation and efficient port reconfiguration

[0008] ■ Study the signaling details of the ports (e.g., non-zero power (NZP) CSI reference signal (RS) ports) (if needed to be known by the UE)

[0009] ■Study the dynamic adaptation (including activation / deactivation) of CSI measurement or reporting configuration for port adaptation Summary of the invention

[0010] One objective of the present application is to provide a technical solution for dynamic adaptation of spatial elements, for example, a technical solution for CSI measurement or reporting configuration for dynamic adaptation (including activation / deactivation) of antenna ports, etc.

[0011] According to some embodiments of the present application, an exemplary remote device (e.g., UE) includes a transceiver and a processor coupled to the transceiver. The processor is configured to: receive at least one first signaling indicating a first set of resource elements of a CSI-RS via the transceiver; receive at least one second signaling indicating antenna port related information via the transceiver; and determine at least one of a second set of resource elements of the CSI-RS, an application time of the antenna port related information, or a set of CSI reference resources based on at least one of the at least one first signaling or the at least one second signaling.

[0012] In some embodiments of the present application, when the number of antenna ports determined based on the at least one first signaling is less than or equal to the number of ports determined based on the at least one second signaling, the second group of resource elements of CSI-RS is determined as the first group of resource elements of CSI-RS.

[0013] In some embodiments of the present application, when the number of antenna ports determined based on the at least one first signaling is greater than the number of antenna ports determined based on the at least one second signaling, the second group of resource elements of the CSI-RS is determined based at least on the at least one second signaling.

[0014] In some embodiments of the present application, the antenna port related information indicates a row index of a table of CSI-RS positions within a time slot, and the processor is configured to: determine the number of antenna ports based on the row index.

[0015] In some embodiments of the present application, the antenna port related information indicates the number of antenna ports. According to some embodiments of the present application, the second group of resource elements of the CSI-RS is determined based on an index in a set of row indices in a table of CSI-RS positions in a time slot, and the set of row indices is determined based on the number of antenna ports. For example, the index is configured or predefined as the lowest index in the set of row indices. According to some embodiments of the present application, the second group of resource elements of the CSI-RS is determined based on the first group of resource elements of the CSI-RS and the third group of resource elements of the CSI-RS, wherein the third group of resource elements of the CSI-RS is determined based on an index in a set of row indices in a table of CSI-RS positions in a time slot, and the set of row indices is determined by the number of antenna ports. In the case where the third group of resource elements of the CSI-RS is a subset of the first group of resource elements of the CSI-RS, the second group of resource elements of the CSI-RS is determined as the third group of resource elements of the CSI-RS; otherwise, the second group of resource elements of the CSI-RS is determined as a group of resource elements associated with the lowest row index in the set of row indices. In the event that there are more than one set of resource elements for CSI-RS associated with more than one index in the set of row indices that are a subset of the first set of resource elements for CSI-RS, the third set of resource elements for CSI-RS is determined based on a lowest index in the more than one index.

[0016] In some embodiments of the present application, the processor is configured to: receive third signaling indicating the second group of resource elements of the CSI-RS associated with the antenna port related information. According to some embodiments of the present application, the second group of resource elements of the CSI-RS is one of multiple groups of CSI-RS resource elements for CSI-RS resources, and each of the multiple groups of resource elements of the CSI-RS is associated with a different number of antenna ports. According to some embodiments of the present application, the second group of resource elements of the CSI-RS is one of multiple groups of resource elements of the CSI-RS associated with a CSI-RS resource group, and each CSI-RS resource in the CSI-RS resource group is associated with a different number of antenna ports.

[0017] In some embodiments of the present application, the subcarrier index of the second set of resource elements is configured, or determined by the at least one first signaling, or determined by a predefined or lowest subcarrier index determined by the at least one first signaling.

[0018] In some embodiments of the present application, the symbol index of the second set of resource elements is configured, or determined by the at least one first signaling, or determined by a predefined or lowest indexed symbol index determined by the at least one first signaling.

[0019] In some embodiments of the present application, the application time of the antenna port related information is determined by a predefined or configured delay between the reception of the at least one second signaling and the application of the at least one second signaling. According to some embodiments of the present application, the delay is in ms or in time slots; and when the unit is a time slot, the duration of the time slot is determined based on a subcarrier spacing (SCS). In an example, the SCS is configured or determined based on a frequency band or an active bandwidth part (BWP). According to some embodiments of the present application, the application time is aligned with a time slot boundary or a starting time domain position of a group of CSI-RS resources corresponding to the second group of resource elements of the CSI-RS.

[0020] In some embodiments of the present application, before new antenna port related information is applied, the antenna port related information is valid.

[0021] In some embodiments of the present application, the at least one second signaling is associated with a predefined or configured duration, and the antenna port related information is valid from the application time and ends at the application time plus the duration.

[0022] In some embodiments of the present application, default antenna port related information is applicable when no other antenna port related information is valid.

[0023] In some embodiments of the present application, the set of CSI reference resources is divided into two subsets of CSI reference resources, and the first subset of CSI reference resources is before the application of the at least one second signaling, and the second subset of CSI reference resources is after the application of the at least one second signaling. According to some embodiments of the present application, the measurement results based on the first subset of CSI reference resources are separated from the measurement results based on the second subset of CSI reference resources. According to some embodiments of the present application, in the case where the CSI report is after the application of the at least one second signaling and all CSI reference resources used for the CSI report belong only to the first subset of CSI reference resources, the CSI report will be discarded. According to some other embodiments of the present application, in the case where the CSI report is after the application of the at least one second signaling and the CSI reference resources used for the CSI report belong to the first subset of CSI reference resources and the second subset of CSI reference resources, the reporting metric of the CSI report is based on the second subset of CSI reference resources. According to some embodiments of the present application, when the application time of the at least one second signaling is later than the start time domain position of a group of RSs and earlier than the end time domain position of the group of RSs, the group of RSs is excluded from the first subset of CSI reference resources and the second subset of CSI reference resources.

[0024] Some embodiments of the present application also provide a method, which can be performed by a remote device according to an embodiment of the present application. An exemplary method includes: receiving at least one first signaling indicating a first group of resource elements of a CSI-RS; receiving at least one second signaling indicating antenna port related information; and determining at least one of a second group of resource elements of a CSI-RS, an application time of the antenna port related information, or a group of CSI reference resources based on at least one of the at least one first signaling or the at least one second signaling.

[0025] Some other embodiments of the present application also provide a radio access network (RAN) node, such as a gNB, comprising: a transceiver; and a processor coupled to the transceiver, wherein the processor is configured to: transmit at least one first signaling indicating a first set of resource elements of a CSI-RS via the transceiver; transmit at least one second signaling indicating antenna port related information via the transceiver; and determine at least one of a second set of resource elements of the CSI-RS, an application time of the antenna port related information, or a set of CSI reference resources based on at least one of the at least one first signaling or the at least one second signaling.

[0026] In view of the above, embodiments of the present application provide a technical solution for dynamic adaptation of spatial elements, for example, dynamic adaptation of CSI modes and CSI reference resources in response to adjustment of the number of antenna ports, and thus will facilitate the deployment and implementation of NR. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to describe the manner in which the advantages and features of the present disclosure can be obtained, the description of the present disclosure is presented by reference to specific embodiments of the present disclosure illustrated in the accompanying drawings. These drawings depict only exemplary embodiments of the present disclosure and therefore should not be considered to limit its scope.

[0028] Figure 1 is a schematic diagram illustrating an exemplary wireless communication system according to some embodiments of the present application.

[0029] Figure 2 is a flowchart illustrating an exemplary procedure of a method for dynamic adaptation of spatial elements according to some embodiments of the present application.

[0030] Figure 3 is a schematic diagram illustrating the determination of a CSI-RS pattern according to some embodiments of the present application, wherein Figure 3 a illustrates a CSI-RS pattern before adaptation of spatial elements according to some embodiments of the present application, and Figure 3 b illustrates the CSI-RS pattern after adaptation of spatial elements according to some embodiments of the present application.

[0031] Figure 4 is a schematic diagram illustrating the determination of CSI-RS patterns according to some other embodiments of the present application, wherein Figure 4 a illustrates a CSI-RS pattern before adaptation of spatial elements according to some other embodiments of the present application, and Figure 4 b illustrates the CSI-RS pattern after adaptation of spatial elements according to some other embodiments of the present application.

[0032] Figure 5 is a schematic diagram illustrating the determination of CSI-RS patterns according to some other embodiments of the present application, wherein Figure 5 a illustrates a CSI-RS pattern before adaptation of spatial elements according to some other embodiments of the present application, and Figure 5 b illustrates the CSI-RS pattern after adaptation of spatial elements according to some other embodiments of the present application.

[0033] Figure 6 is a schematic diagram illustrating a CSI reporting procedure according to some embodiments of the present application.

[0034] Figure 7A block diagram illustrating an exemplary apparatus for dynamic adaptation of spatial elements according to some embodiments of the present application.

[0035] Figure 8 A block diagram illustrating an exemplary apparatus for dynamic adaptation of spatial elements according to some other embodiments of the present application. DETAILED DESCRIPTION

[0036] The detailed description of the accompanying drawings is intended as a description of the preferred embodiments of the present application, and is not intended to represent the only form in which the present application can be practiced. It should be understood that the same or equivalent functions can be implemented by different embodiments that are intended to be included in the spirit and scope of the present application.

[0037] Reference will now be made in detail to some embodiments of the present application, examples of which are illustrated in the accompanying drawings. To facilitate understanding, embodiments are provided under specific network architectures and new service scenarios (e.g., 3rd Generation Partnership Project (3GPP) 5G, 3GPP LTE, etc.). It is considered that with the development of network architectures and new service scenarios, all embodiments in the present application are also applicable to similar technical problems; and in addition, the terms cited in the present application may be changed, which should not affect the principles of the present application.

[0038] Figure 1 A schematic diagram illustrating an exemplary wireless communication system 100 in accordance with some embodiments of the present application.

[0039] As in Figure 1 As shown in FIG. 1 , the wireless communication system 100 includes a UE 103 and a BS 101. Although for simplicity, Figure 1 Only one BS is illustrated in FIG. 1 , but it is considered that in some other embodiments of the present application, the wireless communication system 100 may include more BSs. Similarly, although for simplicity, Figure 1 Only one UE is illustrated in FIG. 1 , but it is considered that in some other embodiments of the present application, the wireless communication system 100 may include more UEs.

[0040] The wireless communication system 100 is compatible with any type of network capable of sending and receiving wireless communication signals. For example, the wireless communication system 100 is compatible with wireless communication networks, cellular telephone networks, networks based on time division multiple access (TDMA), networks based on code division multiple access (CDMA), networks based on orthogonal frequency division multiple access (OFDMA), LTE networks, networks based on 3GPP, 3GPP 5G networks, satellite communication networks, high altitude platform networks, and / or other communication networks.

[0041] BS 101 may also be referred to as an access point, access terminal, base, macro cell, Node B, enhanced Node B (eNB), gNB, home Node-B, relay node or device, or described using other terms used in the art. BS 101 is typically part of a radio access network that may include a controller communicatively coupled to BS 101.

[0042] In addition, BS101 can be configured with one transmit-receive point (TRP) (or panel), i.e. in a single TRP scenario or multiple TRPs (or panels), i.e. in a multi-TRP scenario. That is, one or more TRPs are associated with BS101. The TRP can operate like a small BS. Two TRPs can have the same cell ID (identity or index) or different cell IDs. The two TRPs can communicate with each other via a backhaul link. This backhaul link can be an ideal backhaul link or a non-ideal backhaul link. The latency of an ideal backhaul link can be considered to be zero, and the latency of a non-ideal backhaul link can be tens of milliseconds, and is much larger than that of an ideal backhaul link, for example, on the order of tens of milliseconds.

[0043] A single TRP may be used to serve one or more UEs 103 under the control of BS 101. In different scenarios, TRP may be referred to by different terms, which may be represented by a TCI state index or a CORESETPoolIndex value, etc. It should be understood that the TRP (or panel) configured for BS 101 may be transparent to UE 103.

[0044] UE 103 may include a computing device, such as a desktop computer, a laptop computer, a personal digital assistant (PDA), a tablet computer, a smart TV (e.g., a TV connected to the Internet), a set-top box, a game console, a security system (including a security camera), a car computer, a network device (e.g., a router, a switch, and a modem), or the like. According to an embodiment of the present application, UE 103 may include a portable wireless communication device, a smart phone, a cellular phone, a flip phone, a device with a subscriber identity module, a personal computer, a selective call receiver, or any other device capable of sending and receiving communication signals on a wireless network. In some embodiments of the present application, UE 103 may include a wearable device, such as a smart watch, a fitness bracelet, an optical head-mounted display, or the like. In addition, UE 103 may be referred to as a subscriber unit, a mobile device, a mobile station, a user, a terminal, a mobile terminal, a wireless terminal, a fixed terminal, a subscriber station, a user terminal, or a device, or described using other terms used in the art.

[0045] According to the RAN1#109e protocol, technologies and enhancements for adaptation of spatial elements, such as dynamic adaptation (including activation / deactivation) of CSI measurement or reporting configuration for port adaptation, will be further studied, including but not limited to the impact on CSI-RS position (also known as "CSI-RS pattern" or resource element (RE) occupancy of CSI-RS) and CSI reporting.

[0046] Regarding the CSI pattern, the old 3GPP version, such as TS38.211, provides the CSI-RS position in the time slot in the following table 7.4.1.5.3-1. Based on the CSI-RS pattern, PDSCH rate matching around the CSI-RS, CSI-RS sequence mapping to RE, and collision handling with other RS ​​or channels can also be determined.

[0047] Table 7.4.1.5.3-1: CSI-RS position within a slot

[0048]

[0049]

[0050] Each of the given rows of Table 7.4.1.5.3-1 Corresponds to the frequency domain subcarrier index and the time domain symbol index within a resource block (RB). The code division multiplexing (CDM) group can be of size 1 (no CDM) or size 2, 4, or 8. The CDM type is provided by the higher layer parameter cdm-Type in the CSI-RS-ResourceMapping IE. The CDM group index j given in Table 7.4.1.5.3-1 corresponds to the time / frequency position of a given row of the table The indices k' and l' index the resource elements within the CDM group. The time domain positions l0∈{0,1,…,13} and l1∈{2,3,…,12} are provided by the higher layer parameters firstOFDMSymbolInTimeDomain and firstOFDMSymbolInTimeDomain2 in the CSI-RS-ResourceMapping IE or CSI-RS-ResourceConfigMobility IE, respectively, and are defined relative to the start of the time slot. The frequency domain position, e.g., k0, k1, k2, or k3 is given by a bitmap provided by the higher layer parameter frequencyDomainAllocation in the CSI-RS-ResourceMapping IE or CSI-RS-ResourceConfigMobility IE with a bitmap.

[0051] As can be seen from Table 7.4.1.5.3-1, for several antenna ports, the mapping between CSI-RS and RE may be different depending on the CDM type, time domain symbol allocation and frequency subcarrier allocation. In view of different CDM types, symbol allocation and frequency subcarrier allocation, etc., there may be multiple CSI-RS patterns for a certain number of antenna ports. Therefore, when adapting or adjusting the number of spatial elements, for example, reducing the number of antenna ports to save network energy, it should be determined which CSI-RS pattern to use.

[0052] Regarding CSI reporting, the CSI reference resource is defined as follows according to TS38.214:

[0053] - In the frequency domain, the CSI reference resources are defined by the group of downlink physical resource blocks corresponding to the band to which the derived CSI is related.

[0054] - In the time domain, the CSI reference resources for the CSI report in uplink time slot n' consist of a single downlink time slot Definition, where K offset is a parameter configured by a higher layer as specified in clause 4.2 of [6 TS 38.213], and where It's K offset The subcarrier spacing configuration of frequency range 1 is 0.

[0055] -in And μ DL and μ UL are the subcarrier spacing configurations for the downlink (DL) and uplink (UL), respectively, and and μ offset Determined by the ca-SlotOffset configured by higher layers of the cell transmitting uplink and downlink, as defined in clause 4.5 of [4, TS 38.211]

[0056] - For periodic and semi-persistent CSI reporting

[0057] - If a single CSI-RS / synchronization signal (SS) / physical broadcast channel (PBCH) block (SSB) resource is configured for channel measurement, then n CSI_ref is greater than or equal to The minimum value of , so that it corresponds to a valid downlink time slot, or

[0058] - If multiple CSI-RS / SSB resources are configured for channel measurement, then n CSI_ref is greater than or equal to The minimum value of so that it corresponds to a valid downlink time slot.

[0059] -For aperiodic CSI reporting, if the UE is instructed by DCI to report CSI in the same timeslot as the CSI request, then n CSI_ref Make the reference resource and the corresponding CSI request in the same valid downlink time slot, otherwise n CSI_ref is greater than or equal to The minimum value of time slot nn CSI_ref corresponds to an effective downlink time slot, where Z' corresponds to the clause

[0060] The latency requirements defined in 5.4.

[0061] - When periodic or semi-persistent CSI-RS / CSI-IM or SSB is used for channel / interference measurement, the UE is expected not to measure channel / interference on the CSI-RS / CSI-IM / SSB until the last OFDM symbol of the CSI-RS / CSI-IM / SSB is received up to Z' symbols before the transmission time of the first OFDM symbol of the aperiodic CSI report.

[0062] It can be seen that when CSI reporting is performed at uplink time slot n, the corresponding downlink time slot carrying CSI-RS / SSB should be no later than (n-n_CSI). However, there may be different n_CSI values ​​in different scenarios. If time domain restrictions are configured, the CSI report is based on a single measurement. Otherwise, it depends on the UE implementation to average the measurement results at different time instances. Therefore, when adjusting the number of spatial elements, for example, reducing the number of antenna ports to save network energy, how to define the CSI reference resources should also be addressed.

[0063] In addition, when the number of antenna ports is adjusted, the mapping between antenna elements and antenna ports may also change. There may be a delay between the reception of the signaling indicating that the number of antenna ports is being adjusted and the application of this signaling. Therefore, another problem should also be solved, that is, when the adjusted number of antenna ports will be applied to the UE side.

[0064] At least in consideration of the above technical problems, the embodiments of the present application propose a technical solution for dynamic adaptation of space elements, such as a method and device for dynamic adaptation of space elements.

[0065] Figure 2 1 is a flowchart illustrating an exemplary procedure of a method for dynamic adaptation of spatial elements according to some embodiments of the present application. Although the method is described at a system level between a RAN node (e.g., a gNB) and a remote device (e.g., a UE), a person skilled in the art should understand that the method implemented in the RAN node and the remote device can be implemented separately and / or incorporated by other devices with similar functions.

[0066] refer to Figure 2 , the RAN node (e.g., gNB) may configure a first set of resource elements for CSI-RS (also referred to as "CSI-RS resource elements") for the UE as in the legacy technology. In step 201, the RAN node will transmit at least one first signaling to the UE, such as a radio resource control (RRC) signaling or a MAC CE indicating the first set of resource elements for CSI-RS. Therefore, in step 202, the UE will receive at least one first signaling. The at least one first signaling may indicate a time domain position (e.g., symbol index l), a frequency domain position (e.g., subcarrier index k), and information associated with a row index in a table of CSI-RS positions within a time slot, such as Table 7.4.1.5.3-1 (e.g., density, CDM type, number of antenna ports) specified in TS38.211 as described above, so that the CSI RS pattern can be determined. It should be known to those skilled in the art that, with the evolution of 3GPP technology, Table 7.4.1.5.3-1 may also evolve into a different table. Therefore, the table of CSI-RS positions within a time slot in this application should be limited to Table 7.4.1.5.3-1.

[0067] In addition, those skilled in the art should know that, for the sake of clarity, the terms (such as first, second, and third, etc.) herein are only used to distinguish similar features or elements, etc., and should not be regarded as limiting the scope of the technical solution. In addition, the term "a group" or the like means "one or more" or "at least one" or the like. For example, the first group of resource elements of CSI-RS means one or more resource elements of CSI-RS or at least one resource element of CSI-RS.

[0068] The RAN node may dynamically adjust the spatial elements, for example, the number of antenna ports. In this document, considering the CSI-RS pattern and CSI measurement and reporting, the antenna port may also be referred to as a CSI-RS antenna port or a CSI-RS port. In step 203, the RAN node transmits at least one second signaling indicating antenna port related information to the UE to indicate the adjustment. Therefore, in step 204, the UE receives at least one second signaling indicating antenna port related information.

[0069] At least one second signaling may be configured per cell or per TRP. Exemplary at least one second signaling may be downlink control information (DCI), MAC CE, or a combination thereof. The types of DCI are various, for example, group common DCI or aperiodic DCI, etc. Exemplary aperiodic DCI is a DCI that triggers a CSI report and a corresponding aperiodic CSI-RS transmission, wherein the aperiodic CSI-RS transmission is associated with the number of antenna ports. In some scenarios, there may be more than one set of such at least one second signaling indicating antenna port related information to the UE for different time instances, respectively. Therefore, if there are more than one set of such at least one second signaling indicating antenna port related information at the same time, the latest set of at least one second signaling will be applied according to some embodiments of the present application. However, in some other embodiments of the present application, the group common DCI may always have the highest priority, regardless of whether it is the latest signaling; and in the case of more than one group common DCI at the same time, the latest group common DCI will be applied. In addition, although the wording "adjusted" or "updated" or the like is used, this does not mean that the adjusted spatial elements must be different from the previous elements. The adjusted spatial element may be the same as or different from the spatial element before adjustment.

[0070] In response to the spatial elements being adjusted, the RAN node and the UE will perform corresponding operations to adapt the adjusted spatial elements, which are various according to some embodiments of the present application. For example, in step 205, the RAN node will determine at least one of the second set of resource elements of the CSI-RS, the application time of the antenna port related information (or the application time of at least one second signaling), or a set of CSI reference resources based on at least one of the at least one first signaling or at least one second signaling. Similarly, in step 206, the UE will also determine at least one of the second set of resource elements of the CSI-RS, the application time of the antenna port related information, or a set of CSI reference resources based on at least one of the at least one first signaling or at least one second signaling. That is, in response to the antenna port related information, the RAN side and the UE side can respectively determine or update or define the CSI-RS pattern (or the second set of resource elements of the CSI-RS), the application time of the antenna port related information (or at least one second signaling), and the CSI reference resources, etc., which will be specifically described below in view of various embodiments of the present application. Those skilled in the art should know that, due to the consistency between the network side and the remote side, although some embodiments are described using only one side as an example, in addition to special operations, corresponding operations in the other side should also be determined.

[0071] Determination of application time

[0072] In response to the reception of the antenna port related information indicated in the at least one second signaling on the UE side, there may be a remapping of the antenna element to the antenna port, which will take time. Therefore, the reception of the at least one second signaling may not mean the application of the at least one first signaling on the UE side. According to some embodiments of the present application, a specific delay is predefined or configured so that the application time of the antenna port related information (or at least one second signaling) can be uniquely determined on the network side and the UE side.

[0073] In some embodiments of the present application, the delay is in ms or in time slots. In the case where the unit is a time slot, the duration of the time slot is determined based on the SCS. An exemplary SCS is configured or determined based on the frequency band or SCS of the active BWP. The determined application time will be aligned with the time slot boundary or the starting time domain position of a group of CSI-RS resources corresponding to the second group of resource elements of the CSI-RS. For example, the reception of at least one second signaling is at a time slot n with 15KHz, and for a 30KHz SCS, the delay is 7 time slots, where the 7 time slots for the 30KHz SCS are 3.5 time slots with 15KHz. If the transmission of the CSI-RS is associated with SCS=15KHz, in order to align the time slot boundary, for 15KHz, the actual delay should be ceil(3.5)=4 time slots. Then, at least one second signaling or antenna port relationship information will be applied at a time slot (n+4) with a 15KHz SCS.

[0074] There are also several solutions for the duration to which at least one second signaling or antenna port related information applies. In some embodiments of the present application, at least one first signaling or antenna port related information will be valid before applying new at least one second signaling or new antenna port related information. In some other embodiments of the present application, at least one second signaling (or antenna port related information) will be associated with a predefined or configured duration, and at least one second signaling (or antenna port related information) will be valid from the application time and end at the application time plus the duration.

[0075] In some scenarios, the default antenna port related information may be configured, for example, by at least one first signaling, or predefined in the specification, or assumed to be one of the possible configured antenna port related values. In the case where no other antenna port related information is applicable, the default antenna port related information will be applied. For example, after a predefined or configured duration, the antenna port related information may be invalid, and no new antenna port information is applied in the UE side. Then, it is assumed that the default antenna port related information is applied.

[0076] Determination of CSI-RS pattern

[0077] According to some embodiments of the present application, the second set of resource elements of the CSI-RS may be determined based on at least one first signaling and at least one second signaling (the applied signaling, the same below). That is, the new or updated CSI-RS pattern will be determined based on at least one first signaling and at least one second signaling. Based on the determined CSI-RS pattern, PDSCH rate matching around the CSI-RS, CSI-RS sequence mapping to REs, and conflict handling with other RSs or channels may also be determined.

[0078] The antenna port related information indicated in the at least one second signaling is varied. For example, the at least one second signaling may directly indicate the adjusted or adapted number of antenna ports. In another example, the at least one second signaling may indicate a row index in a table of CSI-RS positions within a time slot. Since the row index is associated with the number of antenna ports, the number of antenna ports will be determined based on the indicated row index. If the number of antenna ports for a particular UE is greater than the indicated number of ports, the number of antenna ports will be reduced to the indicated number of ports.

[0079] In some embodiments of the present application, when the number of antenna ports determined based on at least one first signaling is less than or equal to the number of antenna ports determined based on at least one second signaling, the second group of resource elements of the CSI-RS will be determined as the first group of resource elements of the CSI-RS. That is, the CSI-RS pattern will not change. When the number of antenna ports determined based on at least one first signaling is greater than the number of antenna ports determined based on at least one second signaling, the second group of resource elements of the CSI-RS will be determined based on at least one second signaling. That is, the CSI-RS pattern will be updated or determined in response to antenna port related information. In short, when the number of antenna ports determined from at least one second signaling is not less than the number of antenna ports determined from at least one first signaling, the CSI-RS pattern determined based on at least one first signaling is still applicable; otherwise, a new CSI-RS pattern needs to be determined, adjusted, or updated.

[0080] The determined CSI-RS pattern will be consistent with the indicated row index. The subcarrier index used to determine the CSI-RS pattern is, for example, configured by at least one second signaling, or determined based on at least one first signaling, or is a predefined value or the lowest subcarrier index determined based on at least one first signaling. Similarly, the symbol index used to determine the CSI-RS pattern is, for example, configured by at least one second signaling, or determined based on at least one first signaling, or is a predefined value or the lowest symbol index determined based on at least one first signaling.

[0081] Figure 3 is a schematic diagram illustrating the determination of a CSI-RS pattern according to some embodiments of the present application, wherein Figure 3 a illustrates a CSI-RS pattern before adaptation of spatial elements according to some embodiments of the present application, and Figure 3 b illustrates the CSI-RS pattern after adaptation of spatial elements according to some embodiments of the present application.

[0082] First, refer to Figure 3 a, regarding the CSI-RS pattern before adaptation of the spatial element, it is conventionally determined based on at least one first signaling. For example, the at least one first signaling may indicate that the row index is 7, k0 is 0, k1 is 4, l0 is 3, and l1 is 4. Then, according to Table 7.4.1.5.3-1, the number of antenna ports is determined to be 8 based on the at least one first signaling, and Figure 3 In a, four CDM groups are determined, for example, CDM group #3-0, CDM group #3-1, CDM group #3-2, and CDM group #3-3.

[0083] Then, the network side may adjust the number of antenna ports, for example, reduce the number of antenna ports to 4 to save power. The network side may send at least one second signaling indicating that the row index is 5, corresponding to the number of antenna ports being 4. Then, according to Table 7.4.1.5.3-1, the number of antenna ports is determined to be 4 on the UE side, as shown in Figure 3 b, which is less than the previous number of antenna ports, and thus a new CSI-RS pattern will be determined. The frequency subcarrier index k used to determine the CSI-RS pattern may be configured in at least one second signaling, or determined based on at least one first signaling, or a predefined value or the lowest subcarrier index determined based on at least one first signaling. Similarly, the time domain symbol index l used to determine the CSI-RS pattern is, for example, configured by at least one second signaling, or determined based on at least one first signaling, or a predefined value, or the lowest symbol index determined based on at least one first signaling. According to Table 7.4.1.5.3-1, for Figure 3 The row index in b is 5, and only k0 and l0 will be determined, where k0 is determined to be 0 (the lowest subcarrier index configured by at least one first signaling), and l0 is determined to be 3 (the lowest symbol index configured by at least one first signaling). Figure 3 b only determines two CDM groups, for example, CDM group #3-0' and CDM group #3-1'.

[0084] However, unlike indicating the row index, when the at least one second signaling directly indicates the number of antenna ports, the CSI-RS pattern determination will become a little complicated because the number of antenna ports may correspond to more than one row index. For example, the number of antenna ports of 8 may correspond to row indices 6, 7 or 8. Therefore, a single row index for determining a new CSI-RS pattern will be determined from a set of row indices determined based on the indicated number of antenna ports. For example, the single row index may be configured, for example, by at least one second signaling, or predefined as the lowest index in the set of row indices, or a row index whose corresponding RE is a subset of REs configured in at least one first signaling of a set of row indices. Therefore, the new CSI-RS pattern will be determined based on the single row index.

[0085] Similarly, the determined CSI-RS pattern will be consistent with the row index determined based on the number of antenna ports. The subcarrier index used to determine the CSI-RS pattern is, for example, configured by at least one second signaling, or determined based on at least one first signaling, or is a predefined value or the lowest subcarrier index determined based on at least one first signaling. The symbol index used to determine the CSI-RS pattern is, for example, configured by at least one second signaling, or determined based on at least one first signaling, or is a predefined value or the lowest symbol index determined based on at least one first signaling.

[0086] Figure 4 is a schematic diagram illustrating the determination of CSI-RS patterns according to some other embodiments of the present application, wherein Figure 4 a illustrates a CSI-RS pattern before adaptation of spatial elements according to some other embodiments of the present application, and Figure 4 b illustrates the CSI-RS pattern after adaptation of spatial elements according to some other embodiments of the present application.

[0087] First, refer to Figure 4 a, regarding the CSI-RS pattern before adaptation of the spatial element, which is conventionally determined based on at least one first signaling. For example, the at least one first signaling may indicate that the row index is 7, k0 is 0, k1 is 4, l0 is 3, and l1 is 4. Then, according to Table 7.4.1.5.3-1, the number of antenna ports is determined to be 8 based on the at least one first signaling, and then Figure 4 In a, four CDM groups are determined, for example, CDM group #4-0, CDM group #4-1, CDM group #4-2 and CDM group #4-3.

[0088] Then, the network side can adjust the number of antenna ports, for example, reduce the number of antenna ports to 4 to save power. The network side can directly send at least one second signaling indicating that the number of antenna ports is 4. Then, according to Table 7.4.1.5.3-1, the row index corresponding to the number of antenna ports of 4 is determined in the UE side to be 4 or 5, which is less than the previous number of antenna ports, and therefore a new CSI-RS pattern will be determined. A single row index for determining the adjusted CSI-RS pattern will be determined from the set of row indices including row index 4 and row index 5. For example, a single row index can be determined as the lowest one in the set of row indices, i.e. 4. The frequency subcarrier index k used to determine the CSI-RS pattern can be configured in at least one second signaling, or determined by at least one first signaling, or can be a predefined value or the lowest subcarrier index determined based on at least one first signaling. Similarly, the time domain symbol index l will be determined. According to Table 7.4.1.5.3-1, for Figure 4 The row index in b is 4, and only k0 and l0 will be determined, where k0 is 0 and l0 is 3. Therefore, Figure 4 b only defines two CDM groups, for example, CDM group #4-0' and CDM group #4-1'.

[0089] According to some other embodiments of the present application, when determining a single row index from the set of row indices determined based on the indicated number of antenna ports, whether the set of resource elements of the CSI-RS determined based on the row index is a subset of the first set of resource elements of the CSI-RS will be first considered. For example, the CSI-RS pattern will be determined based on the first set of resource elements of the CSI-RS and the third set of resource elements of the CSI-RS. The third set of resource elements of the CSI-RS is determined based on an index in a set of row indices in a table of CSI-RS positions within a time slot, and the set of row indices is determined by the indicated number of antenna ports. In the case where the third set of resource elements of the CSI-RS is a subset of the first set of resource elements of the CSI-RS, the second set of resource elements of the CSI-RS is determined as the third set of resource elements of the CSI-RS; otherwise, the second set of resource elements of the CSI-RS is determined as a set of resource elements associated with the lowest row index in the set of row indices. In a case where there is more than one set of resource elements for CSI-RS that is a subset of the first set of resource elements for CSI-RS, a third set of resource elements for CSI-RS is determined based on a lowest index among more than one row index associated with the more than one set of resource elements for CSI-RS.

[0090] Similarly, the determined CSI-RS patterns for the first and third groups of resource elements based on the CSI-RS will be consistent with the row index determined based on the indicated number of antenna ports.

[0091] Figure 5is a schematic diagram illustrating the determination of CSI-RS patterns according to some other embodiments of the present application, wherein Figure 5 a illustrates a CSI-RS pattern before adaptation of spatial elements according to some other embodiments of the present application, and Figure 5 b illustrates the CSI-RS pattern after adaptation of spatial elements according to some other embodiments of the present application.

[0092] First, refer to Figure 5 a. Regarding the CSI-RS pattern before adjusting the spatial elements, it is conventionally determined based on at least one first signaling. For example, the at least one first signaling may indicate that the row index is 7, k0 is 0, k1 is 4, l0 is 3, and l1 is 4. Then, according to Table 7.4.1.5.3-1, the number of antenna ports is determined to be 8 based on the at least one first signaling, and Figure 5 In a, four CDM groups are determined, for example, CDM group #5-0, CDM group #5-1, CDM group #5-2 and CDM group #5-3.

[0093] Then, the network side may adjust the number of antenna ports, for example, reduce the number of antenna ports to 4 to save power. The network side may directly send at least one second signaling indicating that the number of antenna ports is 4. Then, according to Table 7.4.1.5.3-1, it is determined in the UE side that the row index corresponding to the number of antenna ports of 4 is 4 or 5, which is less than the previous number of antenna ports, and therefore a new CSI-RS pattern will be determined. The new CSI-RS pattern will be determined based on the first group of resource elements of the CSI-RS and the third group of resource elements of the CSI-RS, wherein the third group of resource elements of the CSI-RS is determined based on a row index in a group of row indices including a row index of 4 and a row index of 5. According to Table 7.4.1.5.3-1, since only the group of resource elements of the CSI-RS determined by the row index of 5 is a subset of the first group of resource elements of the CSI-RS, the second group of resource elements of the CSI-RS will be determined as the third group of resource elements of the CSI-RS determined by the row index of 5. Therefore, in Figure 5 b only two CDM groups are determined, for example, CDM group #5-0' and CDM group #5-1'.

[0094] In some other embodiments of the present application, in addition to at least one second signaling indicating antenna port related information, the network side may also indicate, for example, a third signaling to adapt the CSI-RS pattern of the adjusted space element. An exemplary third signaling is DCI or MAC CE, etc. That is, the network side may transmit a third signaling indicating a second group of resource elements of the CSI-RS associated with the antenna port related information. Regarding the subcarrier index and symbol index used to determine the CSI-RS pattern, it is configured or determined in the same manner as described above, for example, configured or determined based on at least one first signaling, or a predefined or determined minimum subcarrier index or minimum symbol index based on at least one first signaling.

[0095] In some scenarios, the second group of resource elements of the CSI-RS is one of multiple groups of CSI-RS resource elements for the CSI-RS of the CSI-RS resource, and each of the multiple groups of resource elements of the CSI-RS is associated with a different number of antenna ports. That is, for the CSI-RS resource, different CSI-RS patterns may exist for different numbers of antenna ports configured by the third signaling. In response to applying at least one second signaling, the corresponding CSI-RS pattern will be selected.

[0096] There may also be a CSI-RS resource group (or group or subgroup) containing multiple CSI-RS resources, and different CSI-RS resources are associated with different numbers of antenna ports. This CSI-RS resource group may be associated with the purpose of "port adjustment". For example, the second group of resource elements of the CSI-RS is one of multiple groups of resource elements of the CSI-RS associated with the CSI-RS resource group, and each CSI-RS resource in the CSI-RS resource group is associated with a different number of antenna ports. In response to applying at least one second signaling, the corresponding CSI-RS resource will be selected.

[0097] CSI measurement and reporting

[0098] As described above, one or more CSI reference resources are defined for CSI measurement, where multiple RSs (e.g., downlink CSI-RS / SSBs at different time instances) may be used to average CSI measurement results. In response to the application of at least one second signaling, the CSI reference resource definition may also be changed to adapt antenna port related information.

[0099] In some embodiments of the present application, the set of CSI reference resources is divided into two subsets of CSI reference resources, wherein the first subset of CSI reference resources is before the application of at least one second signaling, and the second subset of CSI reference resources is after the application of at least one second signaling. The first subset of CSI reference resources may not include any of the set of CSI reference resources or include part or all of them. Therefore, the second subset of CSI reference resources may include all, part or none of the set of CSI reference resources. For example, for a CSI report having a reference resource boundary before the application of at least one second signaling, all CSI reference resources in the set of CSI reference resources belong to the first subset, and for a CSI report having a reference resource boundary after the application of at least one second signaling, part or all of the CSI reference resources in the set of CSI reference resources belong to the second subset. For a group of RSs, for example, a group of RSs containing at least one CSI-RS / SSB / SRS resource, if the application time of at least one second signaling is later than the start time domain position of the group of RSs and earlier than the end time domain position of the group of RSs, the group of RSs will be excluded from the first subset of CSI reference resources and the second subset of CSI reference resources. That is, the group of RSs will not be defined for CSI measurement.

[0100] According to some embodiments of the present application, the measurement results based on the first subset of CSI reference resources are separated from the measurement results based on the second subset of CSI reference resources. That is, there is no averaging of the measurement results based on the first subset of CSI reference resources and the measurement results based on the second subset of CSI reference resources. The CSI measurement to be reported is based only on the second subset of CSI reference resources.

[0101] In the case where the CSI report is after the application of at least one second signaling and the CSI reference resources used for the CSI report belong only to the first subset of CSI reference resources, the CSI report will be discarded. In the case where the CSI report is after the application of at least one second signaling and the CSI reference resources used for the CSI report belong to the first subset of CSI reference resources and the second subset of CSI reference resources, the reporting metric of the CSI report is based on the second subset of CSI reference resources. That is, in the case where the CSI report is after the application of at least one second signaling, only the CSI measurement results based on the second subset of CSI reference resources will be reported, and the CSI measurement results based on the first subset of CSI reference resources will not be reported.

[0102] Figure 6 is a schematic diagram illustrating a CSI reporting procedure according to some embodiments of the present application.

[0103] refer to Figure 6 , there will be two CSI reports, e.g., CSI report #1 and CSI report #2, which are expected to be transmitted at times t2 and t3, respectively. According to the reference resource boundary of CSI report #1, CSI reference resources #1, #2, #3 are defined for CSI report #1. According to the reference resource boundary of CSI report #2, CSI reference resources #1, #2, #3, #4, #5, #6, #7 are defined for CSI report #2, that is, CSI reference resources #1, #2, #3, #4, #5, #6, #7 may be averaged to derive CSI report #2. CSI reference resources #8, #9 are outside the reference resource boundary of CSI report #1 and CSI report #2 and will not be defined for either CSI report #1 or CSI report #2.

[0104] At time t1, at least one signaling indicating antenna port related information is applied. Since all CSI reference resources of CSI report #1 are before the application of at least one signaling, all CSI reference resources #1, #2, and #3 are valid reference resources for CSI report #1, and all CSI reference resources #1, #2, and #3 can be averaged to derive CSI report #1. However, the transmission time (or reporting time) t2 of CSI report #1 is later than the application time t1. Therefore, CSI report #1 will be discarded and will not be reported to the network side. For CSI report #2, CSI reference resources #1, #2, #3, #4, #5, and #6 are before the application time t1 of at least one signaling, and CSI reference resource #7 is after the application time t1 of at least one signaling. Therefore, CSI report #2 will be reported, and the reporting metric of CSI report #2 will be based only on CSI reference resource #7. That is, only CSI reference resource #7 is a valid reference resource for CSI report #2, and the measurement results based on CSI reference resources #1, #2, #3, #4, #5, and #6 will not be considered for CSI report #2 and will not be averaged together with the measurement results based on CSI reference resource #7.

[0105] In addition to the method, the embodiments of the present application also propose a device for dynamic adaptation of spatial elements.

[0106] For example, Figure 7 A block diagram illustrating an apparatus for dynamic adaptation of a spatial element 700 according to some embodiments of the present application.

[0107] As in Figure 7As shown in , the apparatus 700 may include at least one non-transitory computer-readable medium 701, at least one receiving circuit system 702, at least one transmitting circuit system 704, and at least one processor 706 coupled to the non-transitory computer-readable medium 701, the receiving circuit system 702, and the transmitting circuit system 704. The at least one processor 706 may be a CPU, a DSP, a microprocessor, etc. The apparatus 700 may be a RAN node, such as a gNB, or a remote device, such as a UE, which is configured to perform the methods described above or the like.

[0108] Although in this figure, elements such as at least one processor 706, transmit circuit system 704, and receive circuit system 702 are described in the singular, the plural is contemplated unless explicitly stated to be limited to the singular. In some embodiments of the present application, receive circuit system 702 and transmit circuit system 704 may be combined into a single device, such as a transceiver. In certain embodiments of the present application, apparatus 700 may further include an input device, a memory, and / or other components.

[0109] In some embodiments of the present application, a non-transitory computer-readable medium 701 may have computer-executable instructions stored thereon to cause a processor to implement a method for a RAN node, such as a gNB as described above. For example, when the computer-executable instructions are executed, the processor 706 interacts with the receiving circuit system 702 and the transmitting circuit system 704 to perform the steps for the RAN node as described above.

[0110] In some embodiments of the present application, the non-transitory computer-readable medium 701 may have computer-executable instructions stored thereon to enable the processor to implement a method for a remote device, such as a UE as described above. For example, when the computer-executable instructions are executed, the processor 706 interacts with the receiving circuit system 702 and the transmitting circuit system 704 to perform steps for the remote device as described above.

[0111] Figure 8 is a block diagram of a device for dynamic adaptation of a spatial element 800 according to some other embodiments of the present application.

[0112] refer to Figure 8 , the apparatus 800 (e.g., a gNB or a UE) may include at least one processor 802 and at least one transceiver 804 coupled to the at least one processor 802. The transceiver 804 may include at least one separate receive circuit system 806 and transmit circuit system 804, or at least one integrated receive circuit system 806 and transmit circuit system 804. The at least one processor 802 may be a CPU, a DSP, a microprocessor, etc.

[0113] According to some embodiments of the present application, device 800 is a RAN node, such as a gNB, which includes: a transceiver; and a processor coupled to the transceiver, wherein the processor is configured to: transmit at least one first signaling indicating a first group of resource elements of a CSI-RS via the transceiver; transmit at least one second signaling indicating antenna port related information via the transceiver; and determine at least one of a second group of resource elements of the CSI-RS, an application time of the antenna port related information, or a set of CSI reference resources based on at least one of the first at least one signaling or the at least one second signaling.

[0114] According to some embodiments of the present application, device 800 is a remote device, such as a UE, which includes: a transceiver; and a processor coupled to the transceiver, wherein the processor is configured to: receive at least one first signaling indicating a first group of resource elements of a CSI-RS via the transceiver; receive at least one second signaling indicating antenna port related information via the transceiver; and determine at least one of a second group of resource elements of the CSI-RS, an application time of the antenna port related information, or a set of CSI reference resources based on at least one of the at least one first signaling or the at least one second signaling.

[0115] The method according to the embodiment of the present application can also be implemented on a programmed processor. However, the controller, flow chart and module can also be implemented on a general or special-purpose computer, a programmed microprocessor or microcontroller and peripheral integrated circuit elements, an integrated circuit, a hardware electronic or logic circuit (such as a discrete element circuit), a programmable logic device or the like. In general, any device capable of implementing the flow chart shown in the figure can be used to implement the processor function of the present application. For example, an embodiment of the present application provides a device including a processor and a memory. Computer programmable instructions for implementing the method are stored in a memory, and the processor is configured to execute the computer programmable instructions to implement the method. The method may be a method as stated above or other methods according to an embodiment of the present application.

[0116] Alternative embodiments preferably implement the method according to the embodiments of the present application in a non-transitory computer-readable storage medium storing computer programmable instructions. The instructions are preferably executed by a computer executable component that is preferably integrated with a network security system. The non-transitory computer-readable storage medium may be stored on any suitable computer-readable medium, such as RAM, ROM, flash memory, EEPROM, optical storage device (CD or DVD), hard drive, floppy disk drive, or any suitable device. The computer executable component is preferably a processor, but the instructions may be executed alternatively or additionally by any suitable dedicated hardware device. For example, an embodiment of the present application provides a non-transitory computer-readable storage medium having computer programmable instructions stored therein. The computer programmable instructions are configured to implement the method as stated above or other methods according to the embodiments of the present application.

[0117] In addition, in the present disclosure, the term "includes, including" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment comprising a series of elements not only comprises the elements, but may comprise other elements not explicitly listed or inherent to the process, method, article or equipment. In the absence of more constraints, an element beginning with "a, an" or the like does not exclude the presence of additional identical elements in the process, method, article or equipment comprising the elements. In addition, the term "another" is defined as at least a second or more. The term "having" and the like as used herein are defined as "comprising".

Claims

1. A remote device, comprising: Transceiver; and a processor coupled to the transceiver, wherein the processor is configured to: Receiving, via the transceiver, at least one first signaling indicating a first group of resource elements of a channel state information CSI reference signal RS; receiving, via the transceiver, at least one second signaling indicating antenna port related information; and At least one of a second group of resource elements of a CSI-RS, an application time of the antenna port related information, or a group of CSI reference resources is determined based on at least one of the at least one first signaling and the at least one second signaling.

2. The remote device according to claim 1, wherein: In a case where the number of antenna ports determined based on the at least one first signaling is greater than the number of antenna ports determined based on the at least one second signaling, the second group of resource elements of the CSI-RS is determined based at least on the at least one second signaling.

3. The remote device according to claim 1, wherein: The antenna port related information indicates a row index of a table of CSI-RS positions within a time slot, and the processor is configured to determine the number of antenna ports based on the row index.

4. The remote device according to claim 1, wherein: The antenna port related information indicates the number of antenna ports.

5. The remote device according to claim 4, wherein: The second set of resource elements for the CSI-RS is determined based on an index in a set of row indices of a table of CSI-RS positions within a slot, and the set of row indices is determined based on the number of antenna ports.

6. The remote device according to claim 4, wherein: The second group of resource elements of the CSI-RS is determined based on the first group of resource elements of the CSI-RS and the third group of resource elements of the CSI-RS, wherein the third group of resource elements of the CSI-RS is determined based on an index in a set of row indices in a table of CSI-RS positions within a time slot, and the set of row indices is determined by the number of antenna ports.

7. The remote device according to claim 1, wherein: The processor is configured to: A third signaling is received indicating the second set of resource elements of the CSI-RS associated with the antenna port related information.

8. The remote device according to claim 1, wherein: The subcarrier index of the second group of resource elements is configured, or determined by the at least one first signaling, or determined by a predefined or lowest subcarrier index determined by the at least one first signaling.

9. The remote device according to claim 1, wherein: The application time of the antenna port related information is determined by a predefined or configured delay between reception of the at least one second signaling and application of the at least one second signaling.

10. The remote device of claim 1, wherein: Before new antenna port related information is applied, the antenna port related information is valid.

11. The remote device of claim 1, wherein: The second set of signaling is associated with a predefined or configured duration, and the antenna port related information is valid starting from the application time and ending at the application time plus the duration.

12. The remote device of claim 1, wherein: The set of CSI reference resources is divided into two subsets of CSI reference resources, and a first subset of CSI reference resources precedes application of the at least one second signaling, and a second subset of CSI reference resources follows the application of the at least one second signaling.

13. According to the remote device of claim 12, when the CSI report is after the application of the at least one second signaling, and the CSI reference resources used for the CSI report belong to the first subset of CSI reference resources and the second subset of CSI reference resources, the reporting metric of the CSI report is based on the second subset of CSI reference resources.

14. A radio access network RAN ​​node, comprising: Transceiver; and a processor coupled to the transceiver, wherein the processor is configured to: transmitting, via the transceiver, at least one first signaling indicating a first set of resource elements of a channel state information CSI reference signal RS; transmitting, via the transceiver, at least one second signaling indicating antenna port related information; and At least one of a second group of resource elements of the CSI-RS, an application time of the antenna port related information, or a group of CSI reference resources is determined based on at least one of the at least one first signaling or the at least one second signaling.

15. A method comprising: Receiving at least one first signaling indicating a first group of resource elements of a channel state information CSI reference signal RS; receiving at least one second signaling indicating antenna port related information; and At least one of a second group of resource elements of the CSI-RS, an application time of the antenna port related information, or a group of CSI reference resources is determined based on at least one of the at least one first signaling or the at least one second signaling.

Images