Method, device and communication system for receiving aperiodic channel state information reference signal

Abstract

The embodiment of the invention provides a method and device for receiving an aperiodic channel state information reference signal and a communication system. The apparatus for receiving an aperiodic channel state information reference signal comprises: a first receiver which receives first information carried by a high-level signaling, the first information being at least used by a terminal device to determine a transmission configuration indication state for receiving the aperiodic channel state information reference signal, the first information being at least used by the terminal device to determine a transmission configuration indication state for receiving the aperiodic channel state information reference signal; the first information comprises a first parameter and qcl-info, the first parameter and the qcl-info are optional domains, or the first information comprises the first parameter, a second parameter and the qcl-info, and the first parameter, the second parameter and the qcl-info are optional domains; and a second receiver that receives the aperiodic channel state information reference signal based on the determined transmission configuration indication state.

Description

Method, device and communication system for receiving aperiodic channel state information reference signal Technical Field

[0001] The embodiments of the present application relate to the field of communication technologies. Background Art

[0002] 3GPP (Third Generation Partnership Project) standardized a unified TCI (transmission configuration indication) framework in Rel-17. Rel-17 unified TCI targets the STRP (single transmission and reception point) scenario. Network equipment uses RRC (Radio Resource Control) signaling to configure M (M≥1) TCI states for terminal devices, uses MAC CE (Media Access Control Element) to activate N (N≤8) groups of TCI states in the M TCI states, and uses DCI (Downlink Control Information) to indicate L (1≤L≤N) groups of TCI states in the N groups of TCI states. The transmission configuration indication (TCI) field of the DCI (specifically DCI format 1_1 or DCI format 1_2) indicates a group of TCI states (hereinafter, the TCI state indicated by the TCI field of the DCI will be referred to as the indicated TCI state. In addition, for convenience of expression, "indicated by the TCI field of the DCI" will also be referred to as "DCI indicated"). Each group of TCI states includes one or more TCI states.

[0003] A TCI state may include or correspond to one or two source reference signals (source RS, source Reference Signal). The source reference signal can provide a quasi co-location (QCL) reference for downlink reception (hereinafter, the QCL reference will also be referred to as beam information. The two have different meanings in technical details, but can be understood as the same meaning in this article), which is called a downlink source reference signal; the source reference signal can provide a QCL reference for uplink transmission and is called an uplink source reference signal. Providing a QCL reference for uplink transmission specifically refers to providing a reference for determining the uplink transmission spatial filter (UL Tx spatial filter). The downlink source reference signal provides a QCL reference for a certain downlink channel / signal reception, which means that the beam used by the terminal device to receive a certain channel / signal is the same as some channel large-scale characteristics of the downlink source reference signal. The uplink source reference signal provides a QCL reference for a certain downlink channel / signal reception, which means that the beam used by the terminal device to send a certain channel / signal is the same as some channel large-scale characteristics of the uplink source reference signal.

[0004] TCI states include joint TCI states and separate TCI states. "Joint" or "separate" here refers to joint uplink and downlink TCI states, respectively. The source reference signal in the downlink TCI state (DL TCI state) is a downlink source reference signal, while the source reference signal in the uplink TCI state (UL TCI state) is an uplink source reference signal. The source reference signal in the joint TCI state is both a downlink and uplink source reference signal. The joint TCI state applies to both the downlink beam (receive beam) and the uplink beam (transmit beam), demonstrating reciprocity between the uplink and downlink beams.

[0005] Multiple transmission and reception point (MTRP) transmission is an important scenario in the 5G NR system. It was introduced in Rel-16. Through MTRP-based transmission, the purpose of improving throughput or reliability can be achieved. Rel-16 standardized PDSCH transmission based on MTRP, and Rel-17 standardized PDCCH, PUSCH, and PUCCH transmission based on MTRP. MTRP transmission includes MTRP transmission based on S-DCI (single DCI) and MTRP transmission based on M-DCI (multiple DCI). For MTRP transmission based on S-DCI, one DCI schedules the uplink and downlink transmissions of two TRPs, which is more suitable for situations where the backhaul between TRPs is relatively ideal. For MTRP transmission based on M-DCI, two TRPs use two DCIs to schedule the uplink and downlink transmissions of their respective TRPs, which is more suitable for situations where the backhaul between TRPs is not ideal. The following discussion is all about MTRP based on S-DCI.

[0006] Figure 1 schematically illustrates PDSCH (Physical Downlink Shared Channel) reception based on MTRP. Terminal device 101 receives two PDSCHs from TRP1 and TRP2. For example, terminal device 101 may receive these two PDSCHs using space division, time division, or frequency division. The terminal receives the two PDSCHs based on the quasi-co-location information provided by TCI state 1 and TCI state 2, respectively.

[0007] It should be noted that the above introduction to the technical background is merely intended to provide a clear and complete description of the technical solutions of this application and facilitate understanding by those skilled in the art. Simply because these solutions are described in the background technology section of this application, it should not be assumed that the above technical solutions are well known to those skilled in the art.

[0008] Summary of the Invention

[0009] The MTRP introduced in Rel-16 operates within the traditional TCI state framework. The newly introduced unified TCI in Rel-17 only supports STRP. Given the importance of MTRP and the introduction of unified TCI, it is necessary to design a corresponding unified TCI mechanism for MTRP transmission scenarios. 3GPP plans to extend the unified TCI framework to MTRP transmission scenarios in Rel-18. This has been identified as a project item for Rel-18, and related standardization work is underway.

[0010] In the unified TCI solution under the MTRP transmission scenario in Rel-18, for the terminal device, each TRP has a downlink (DL) link and an uplink (UL) link. There are a total of 4 links between the UE and the two TRPs, namely the downlink of UE-TRP1 (hereinafter referred to as the first downlink), the uplink of UE-TRP1 (hereinafter referred to as the first uplink), the downlink of UE-TRP2 (hereinafter referred to as the second downlink), and the uplink of UE-TRP2 (hereinafter referred to as the second uplink) to provide QCL reference for the transmission of their corresponding links.

[0011] During MTRP transmission, when the RRC parameter unifiedTCI-StateType is set to 'separate', the TCI states corresponding to the above four links are {first downlink TCI state, first uplink TCI state, second downlink TCI state, second uplink TCI state}, which can provide QCL references for the first downlink, first uplink, second downlink, and second uplink, respectively, as shown in Figure 2-a. In this case, the terminal needs to maintain the above four TCI states and update them according to the indicated TCI state indicated by the DCI.

[0012] During MTRP transmission, when the RRC parameter unifiedTCI-StateType is set to 'joint', the TCI states corresponding to the four links are {first joint TCI state, second joint TCI state}, where the first joint TCI state provides a QCL reference for the first downlink and the first uplink, as shown in Figure 2-b. In this case, the terminal needs to maintain the two TCI states and update them based on the indicated TCI state indicated by the DCI.

[0013] FIG2(a) is a schematic diagram of a joint TCI state in Rel-18, and FIG2(b) is a schematic diagram of an independent TCI state in Rel-18.

[0014] The inventors of this application have discovered that in the prior art (e.g., in the MTRP scenario of Rel-18), there is no clear mechanism to determine whether a terminal device receives an aperiodic channel state information reference signal (CSI-RS) based on the TCI state provided in the high-level parameter qcl-info or based on the indicated TCI state. Therefore, clarifying the reception method of the aperiodic CSI-RS is an urgent problem to be solved.

[0015] In response to at least one of the above problems or other similar problems, embodiments of the present application provide a method, apparatus, and communication system for receiving an aperiodic channel state information reference signal.

[0016] According to one aspect of an embodiment of the present application, there is provided an apparatus for receiving an aperiodic channel state information reference signal, which is applied to a terminal device, and the apparatus includes:

[0017] A first receiver, which receives first information carried by high-layer signaling, where the first information is used at least by the terminal device to determine a transmission configuration indication state for receiving an aperiodic channel state information reference signal, wherein the first information includes a first parameter and qcl-info, and the first parameter and qcl-info are optional fields, or the first information includes a first parameter, a second parameter, and qcl-info, and the first parameter, the second parameter, and qcl-info are optional fields; and

[0018] A second receiver is configured to receive the aperiodic channel state information reference signal based on the determined transmission configuration indication state.

[0019] According to another aspect of an embodiment of the present application, a method for receiving an aperiodic channel state information reference signal is provided, which is applied to a terminal device, and the method includes:

[0020] Receiving first information carried by high-layer signaling, where the first information is at least used by the terminal device to determine a transmission configuration indication state for reception of an aperiodic channel state information reference signal, wherein the first information includes a first parameter and qcl-info, and the first parameter and qcl-info are optional fields, or the first information optionally includes a first parameter, a second parameter, and qcl-info, and the first parameter, the second parameter, and qcl-info are optional fields; and

[0021] The aperiodic channel state information reference signal is received based on the determined transmission configuration indication state.

[0022] One of the beneficial effects of the embodiments of the present application is that: the present application clarifies the TCI state applied when the terminal device receives the non-periodic CSI-RS, eliminates the ambiguity when receiving the non-periodic CSI-RS, and can effectively improve the reliability of the system transmission.

[0023] With reference to the following description and accompanying drawings, specific embodiments of the present application are disclosed in detail, indicating the manner in which the principles of the present application can be employed. It should be understood that the embodiments of the present application are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present application include many variations, modifications and equivalents.

[0024] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0025] It should be emphasized that the term "include / comprising" when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The elements and features described in one figure or one embodiment of the present application can be combined with the elements and features shown in one or more other figures or embodiments. In addition, in the accompanying drawings, similar reference numerals represent corresponding parts in several figures and can be used to indicate corresponding parts used in more than one embodiment.

[0027] FIG1 is a schematic diagram of PDSCH reception based on MTRP;

[0028] Figure 2 is a schematic diagram of the joint TCI state and the independent TCI state;

[0029] FIG3 is a schematic diagram of the communication system of the present application;

[0030] FIG4 is a schematic diagram of a method for receiving an aperiodic channel state information reference signal according to an embodiment of the present application;

[0031] FIG5 is another schematic diagram of a method for receiving an aperiodic channel state information reference signal according to an embodiment of the present application;

[0032] FIG6 is another schematic diagram of a method for receiving an aperiodic channel state information reference signal according to an embodiment of the present application;

[0033] FIG7 is a schematic diagram of an apparatus for receiving an aperiodic channel state information reference signal in an embodiment of the second aspect;

[0034] FIG8 is another schematic diagram of an apparatus for receiving an aperiodic channel state information reference signal in an embodiment of the second aspect;

[0035] FIG9 is another schematic diagram of an apparatus for receiving an aperiodic channel state information reference signal in an embodiment of the second aspect;

[0036] FIG10 is a schematic diagram of an electronic device according to an embodiment of the third aspect. DETAILED DESCRIPTION

[0037] The above and other features of the present application will become apparent through the following description with reference to the accompanying drawings. In the description and the accompanying drawings, specific embodiments of the present application are disclosed in detail, which illustrate some embodiments in which the principles of the present application can be adopted. It should be understood that the present application is not limited to the described embodiments. On the contrary, the present application includes all modifications, variations and equivalents that fall within the scope of the appended claims.

[0038] In the embodiments of the present application, the terms "first", "second", etc. are used to distinguish different elements from the name, but do not indicate the spatial arrangement or temporal order of these elements, and these elements should not be limited by these terms. The term "and / or" includes any one and all combinations of one or more of the associated listed terms. The terms "comprising", "including", "having", etc. refer to the presence of the stated features, elements, components or components, but do not exclude the presence or addition of one or more other features, elements, components or components.

[0039] In the embodiments of this application, the singular forms "a," "the," etc. include plural forms and should be broadly understood to mean "a" or "a type" rather than being limited to "one." Furthermore, the term "said" should be understood to include both singular and plural forms, unless the context clearly indicates otherwise. Furthermore, the term "according to" should be understood to mean "at least in part based on...", and the term "based on" should be understood to mean "at least in part based on...", unless the context clearly indicates otherwise.

[0040] In the embodiments of the present application, the term "communication network" or "wireless communication network" may refer to a network that complies with any of the following communication standards, such as New Radio (NR), Long Term Evolution (LTE), Enhanced Long Term Evolution (LTE-A, LTE-Advanced), Wideband Code Division Multiple Access (WCDMA), High-Speed ​​Packet Access (HSPA), etc.

[0041] Furthermore, communication between devices in the communication system may be carried out according to communication protocols of any stage, for example, including but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and 5G, New Radio (NR), etc., and / or other communication protocols currently known or to be developed in the future.

[0042] In the embodiments of the present application, the term "network device" refers to, for example, a device in a communication system that connects a terminal device to a communication network and provides services for the terminal device. Network devices may include, but are not limited to, the following devices: an integrated access and backhaul node (IAB-node), a base station (BS), an access point (AP), a transmission reception point (TRP), a broadcast transmitter, a mobile management entity (MME), a gateway, a server, a radio network controller (RNC), a base station controller (BSC), and the like.

[0043] Base stations may include, but are not limited to, NodeB (NB), evolved NodeB (eNodeB or eNB), and 5G base stations (gNB), among others. They may also include remote radio heads (RRHs), remote radio units (RRUs), relays, or low-power nodes (e.g., femeto, pico, etc.). The term "base station" may include some or all of their functions, and each base station may provide communication coverage for a specific geographic area. The term "cell" may refer to a base station and / or its coverage area, depending on the context in which the term is used.

[0044] In the embodiments of the present application, the term "user equipment" (UE) or "terminal equipment" (TE) refers to, for example, a device that accesses a communication network through a network device and receives network services. A terminal device can be fixed or mobile and may also be referred to as a mobile station (MS), a terminal, a subscriber station (SS), an access terminal (AT), a station, and so on.

[0045] Among them, terminal devices may include but are not limited to the following devices: cellular phones, personal digital assistants (PDAs), wireless modems, wireless communication devices, handheld devices, machine-type communication devices, laptop computers, cordless phones, smart phones, smart watches, digital cameras, etc.

[0046] For another example, in scenarios such as the Internet of Things (IoT), the terminal device can also be a machine or device for monitoring or measurement, including but not limited to: machine type communication (MTC) terminal, vehicle-mounted communication terminal, device-to-device (D2D) terminal, machine-to-machine (M2M) terminal, and so on.

[0047] In addition, the term "network side" or "network device side" refers to one side of the network, which can be a base station or one or more network devices as mentioned above. The term "user side" or "terminal side" or "terminal device side" refers to the user or terminal side, which can be a UE or one or more terminal devices as mentioned above.

[0048] In the following description, the terms "uplink control signal" and "uplink control information (UCI)" or "physical uplink control channel (PUCCH)" are interchangeable, and the terms "uplink data signal" and "uplink data information" or "physical uplink shared channel (PUSCH)" are interchangeable to avoid confusion.

[0049] The terms "downlink control signal" and "downlink control information (DCI)" or "physical downlink control channel (PDCCH)" are interchangeable, and the terms "downlink data signal" and "downlink data information" or "physical downlink shared channel (PDSCH)" are interchangeable.

[0050] In addition, sending or receiving PUSCH can be understood as sending or receiving uplink data carried by PUSCH, sending or receiving PUCCH can be understood as sending or receiving uplink information carried by PUCCH, and sending or receiving PRACH can be understood as sending or receiving preamble carried by PRACH; uplink signals can include uplink data signals and / or uplink control signals, etc., and can also be referred to as uplink transmission (UL transmission) or uplink information or uplink channels. Sending uplink transmission on uplink resources can be understood as sending the uplink transmission using the uplink resources. Similarly, downlink data / signals / channels / information can be understood accordingly.

[0051] In the embodiments of the present application, the high-layer signaling may be, for example, radio resource control (RRC) signaling; for example, an RRC message, including, for example, an MIB, system information, or a dedicated RRC message; or an RRC information element (RRC IE). The high-layer signaling may also be, for example, MAC (Medium Access Control) signaling; or a MAC control element (MAC CE). However, the present application is not limited thereto.

[0052] The following describes the scenarios of the embodiments of the present application through examples, but the present application is not limited thereto.

[0053] Figure 3 is a schematic diagram of the communication system of the present application, which schematically illustrates the situation taking a terminal device and a network device as an example. As shown in Figure 3, the communication system 300 may include a network device 301 and a terminal device 302 (for simplicity, Figure 3 only illustrates one terminal device as an example).

[0054] In the embodiment of the present application, existing services or future services can be carried out between the network device 301 and the terminal device 302. For example, these services include but are not limited to: enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable and low-latency communication (URLLC), etc.

[0055] Among them, the terminal device 302 can send data to the network device 301, for example, using authorization (for example, a configured authorization, i.e., a configured grant) or an authorization-free transmission mode. In the authorization mode, the network device 301 can receive data sent by one or more terminal devices 302 in the authorization, and feedback information to the terminal device 302, such as confirmation ACK / non-confirmation NACK information, etc., or indicate a new authorization to the terminal device 302. The terminal device 302 can confirm the end of the transmission process based on the feedback information or the new authorization, or can also perform new data transmission, or can retransmit the data. For the authorization-free transmission mode, the terminal device can transmit new data on the configured authorization, or can retransmit.

[0056] The following describes the unified TCI framework. In the unified TCI state, the complete steps indicated by the unified TCI state can be divided into three steps.

[0057] Step 1: RRC Configuration

[0058] When the RRC parameter unifiedTCI-StateType is set to 'joint', the RRC layer configures up to 128 TCI states in the dl-OrJointTCI-StateList list. These TCI states are joint TCI states and can provide QCL references for both downlink and uplink.

[0059] When the RRC parameter unifiedTCI-StateType is set to 'separate', the RRC layer configures up to 128 separate DL TCI states in the dl-OrJointTCI-StateList list. These TCI states are separate DL TCI states that provide QCL references for downlink reception. At the same time, the RRC layer also configures up to 64 separate UL TCI states in the ul-TCI-ToAddModList list. These TCI states are separate UL TCI states that provide QCL references for uplink transmission.

[0060] Step 2: MAC-CE activation / deactivation

[0061] Up to eight TCI states are activated through the Unified TCI State Activation / Deactivation MAC-CE command (i.e., Unified TCI States Activation / Deactivation MAC CE). These eight groups correspond to the eight TCI codepoints indicated by the TCI field in the DCI (see Step 3 for an explanation of TCI codepoints). In Rel-17, one or two TCI states (i.e., a group of TCI states) can be activated for each codepoint, providing a QCL reference for the uplink and / or downlink of a terminal device (e.g., UE) to a single TRP.

[0062] For example, in Rel-18, due to the extension to support MTRP transmission (actually 2TRP transmission), there are more possible TCI state combinations that can be activated for each TCI codepoint.

[0063] In MTRP transmission based on S-DCI (single downlink control information), when the RRC parameter unifiedTCI-StateType is set to 'separate', a single TCI codepoint can activate all four TCI states, namely {first downlink TCI state, first uplink TCI state, second downlink TCI state, second uplink TCI state}, or any non-empty subset of these four TCI states. When the RRC parameter unifiedTCI-StateType is set to 'joint', a single TCI codepoint can activate all two TCI states, namely {first joint TCI state, second joint TCI state}, or any non-empty subset of these two TCI states.

[0064] In MTRP transmission based on M-DCI (Multi-Downlink Control Information), different TRPs are distinguished by the high-level parameter coresetPoolIndex. When the coresetPoolIndex value is 0, the Unified TCI state activation / deactivation MAC-CE command can activate the TCI state for the first TRP; when the coresetPoolIndex value is 1, the Unified TCI state activation / deactivation MAC-CE command can activate the TCI state for the second TRP. When coresetPoolIndex takes a certain value, the Unified TCI state activation / deactivation MAC-CE command can activate up to 8 groups of TCI states for one of the TRPs, and the specific method of activating TCI stated for each TCI codepoint is the same as the existing technology in Rel-17.

[0065] Step 3: DCI indication

[0066] The TCI field (Transmission Configuration Indication field) of DCI format 1_1 / 1_2 selects one of the TCI states in Step 2 for receiving or sending the corresponding channel / signal. One value of the TCI field corresponds to one TCI codepoint. Currently, the maximum width of the TCI field is 3 bits, which can indicate up to 2 3 =8 TCI codepoints.

[0067] In the unified TCI framework, the joint / downlink TCI state indicated by the above three steps can provide a QCL reference for the demodulation reference signal (DM-RS) of the physical downlink shared channel (PDSCH), the demodulation reference signal (DM-RS) of the physical downlink control channel (PDCCH), and the channel-state information reference signal (CSI-RS). The joint / uplink TCI state indicated by the above three steps can provide a QCL reference for the demodulation reference signal (DM-RS) of the physical uplink shared channel (PUSCH), the demodulation reference signal (DM-RS) of the physical uplink control channel (PUCCH), and the sounding reference signal (SRS).

[0068] In the unified TCI framework, if a terminal device (e.g., UE) operates in an S-DCI-based MTRP transmission scenario, and the UE has applied the first TCI state, the first uplink TCI state, the second downlink TCI state, and the second uplink TCI state, or has applied the first combined TCI state and the second combined TCI state (all four links from the UE to two TRPs have corresponding TCI states):

[0069] (1) When the TCI field of DCI format 1_1 / 1_2 indicates the full set of {first downlink TCI state, first uplink TCI state, second downlink TCI state, second uplink TCI state} or {first combined TCI state, second combined TCI state}, the TCI state corresponding to each link will be updated with this set of indicated TCI states;

[0070] (2) When the TCI field of DCI format 1_1 / 1_2 indicates a non-empty subset of {first downlink TCI state, first uplink TCI state, second downlink TCI state, second uplink TCI state}, or a non-empty subset of {first combined TCI state, second combined TCI state}, only the TCI state included in the subset is used to update the TCI state of the corresponding link, and the TCI state not in the subset remains unchanged.

[0071] If the UE operates in a transmission scenario of MTRP based on M-DCI, when the value of coresetPoolIndex is determined, the update method of the indicated TCI state can be based on the existing technology in Re-17.

[0072] In this application, the uplink / downlink / joint TCI state indicated by the DCI after the above three steps may be collectively referred to as the indicated TCI state, and the joint / downlink TCI state that can be used to indicate the downlink channel / signal including the CSI-RS may be referred to as the first indicated DL / joint TCI state or the second indicated DL / joint TCI state.

[0073] In the following, in the MTRP scheme based on M-DCI, the first downlink / uplink / combined TCI state refers to the downlink / uplink / combined TCI state corresponding to the coresetPoolIndex value of 0; the second downlink / uplink / combined TCI state refers to the downlink / uplink / combined TCI state corresponding to the coresetPoolIndex value of 1.

[0074] In various embodiments of the present application, the TCI state indicated for the CSI-RS refers to the first indicated joint / downlink TCI state or the second indicated joint / downlink TCI state. The TCI state indicated for the CSI-RS can provide a QCL reference for a terminal device receiving aperiodic CSI-RS.

[0075] Next, CSI-RS is described.

[0076] CSI-RS is a downlink reference signal in the NR system and is mainly used in the following aspects:

[0077] Acquire channel state information. This type of CSI-RS is called CSI-RS for CSI (CSI for CSI).

[0078] Beam management. This type of CSI-RS is called CSI-RS for CSI (BM).

[0079] Time-frequency tracking: This type of CSI-RS is called a time-frequency tracking reference signal (TRS).

[0080] Mobility management.

[0081] The NR (New Radio) system uses the high-level parameter CSI-ResourceConfig to configure CSI-RS resources. Among them, the resourceType in CSI-ResourceConfig is used to configure the time domain characteristics of CSI-RS. According to different time domain characteristics, CSI-RS can be divided into the following three types:

[0082] Periodic CSI-RS, the corresponding configuration resourceType value is 'periodic';

[0083] Semi-persistent CSI-RS, the corresponding configuration resourceType value is 'semiPersistent';

[0084] For aperiodic CSI-RS, the corresponding resourceType value is 'aperiodic'.

[0085] Next, qcl-info of the aperiodic CSI-RS is described.

[0086] The transmission of aperiodic CSI-RS is triggered by the CSI request field in DCI format 0_1 / 0_2. The CSI request field can trigger the transmission of CSI-RS with different time domain characteristics. If aperiodic CSI-RS is triggered, qcl-info is configured in CSI-AssociatedReportConfigInfo in the high-level parameter CSI-AperiodicTriggerState. qcl-info provides the UE with the QCL reference used to receive aperiodic CSI-RS, that is, the UE can use the TCI state configured in qcl-info to receive aperiodic CSI-RS.

[0087] In Rel-17, if qcl-info is not configured, the UE applies the indicated TCI state to the aperiodic CSI-RS, that is, the indicated DL / joint TCI state is used to receive the aperiodic CSI-RS.

[0088] In Rel-18, a new parameter, applyIndicatedTCIState-r18, is introduced in the higher-layer parameter CSI-AssociatedReportConfigInfo. For example, the new parameter is named applyIndicatedTCIState-r18 and has a value range of {the first, the second}. This parameter is used to inform the UE whether to use the first indicated DL / joint TCI state or the second indicated DL / joint TCI state for receiving aperiodic CSI-RS resources. The applyIndicatedTCIState-r18 mentioned below refers specifically to the applyIndicatedTCIState-r18 in CSI-AssociatedReportConfigInfo.

[0089] In the higher-layer parameter configuration, if the CSI-RS resource or the CSI-RS resource set in which the CSI-RS resource is located is configured to apply the indicated TCI state, the UE's aperiodic CSI-RS reception method is determined based on the value of applyIndicatedTCIState-r18:

[0090] If the value of applyIndicatedTCIState-r18 indicates the first indicated combined / downlink TCI state, for example, the value is 'the first', the UE applies the first indicated combined / downlink TCI state to the aperiodic CSI-RS.

[0091] If the value of applyIndicatedTCIState-r18 indicates the second indicated combined / downlink TCI state, for example, the value is 'the second', the UE applies the second indicated combined / downlink TCI state to the aperiodic CSI-RS.

[0092] In the various embodiments of this application:

[0093] Applying a TCI state to an aperiodic CSI-RS (channel state information reference signal) means that a terminal device receives an aperiodic CSI-RS based on the TCI state;

[0094] The unified TCI framework and the unified TCI framework are interchangeable and have the same meaning;

[0095] When a transmission configuration indication state (TCI state) for aperiodic channel state information reference signal (CSI-RS) reception is an indicated TCI state (indicated TCI state), the indicated TCI state is an indicated joint / downlink TCI state;

[0096] The indicated combined / downlink TCI state may be the first indicated combined / downlink TCI stat or the second indicated combined / downlink TCI stat;

[0097] The first indicated joint / downlink TCI state and the first indicated joint / DL TCI state are interchangeable and have the same meaning.

[0098] The second indicated joint / downlink TCI state and the second indicated joint / DL TCI state are interchangeable and have the same meaning;

[0099] Applying the indicated TCI state to the aperiodic CSI-RS may include applying a first indicated joint / DL TCI state or a second indicated joint / DL TCI state to the aperiodic CSI-RS.

[0100] In the various embodiments of this application:

[0101] Applying the first indicated joint / DL TCI state or the second indicated joint / DL TCI state to the aperiodic CSI-RS means using the first indicated joint / DL TCI state or the second indicated joint / DL TCI state for receiving the aperiodic CSI-RS;

[0102] Applying the TCI state configured in qcl-info to the aperiodic CSI-RS means using the TCI state configured in qcl-info for receiving the aperiodic CSI-RS.

[0103] In the various embodiments of this application:

[0104] "Parameter" (eg, first parameter, second parameter, third parameter, qcl-info, etc.) and "field" have the same meaning and can be interchanged in this application.

[0105] Embodiments of the first aspect

[0106] When a terminal device receives aperiodic CSI-RS, it can apply the TCI state provided in qcl-info to the aperiodic CSI-RS, or it can apply the indicated TCI state. That is, both the high-level parameter qcl-info and the indicated TCI state can provide QCL references for the terminal device to receive aperiodic CSI-RS.

[0107] However, in the prior art (for example, in the MTRP scenario of Rel-18), there is no clear mechanism to determine whether the aperiodic CSI-RS resource (CSI-RS resource) or the CSI-RS resource set (CSI-RS resource set) in which the CSI-RS resource is located is configured to apply the indicated TCI state (indicated TCI state). In other words, the terminal device is uncertain about how to receive the aperiodic CSI-RS. Therefore, there is ambiguity in the process of receiving the aperiodic CSI-RS, which reduces the reliability of system transmission.

[0108] In order to solve the above problems or at least similar problems, an embodiment of the first aspect of the present application provides a method for receiving a non-periodic channel state information reference signal, which is applied to a terminal device, for example, the terminal device 301 in Figure 3.

[0109] FIG4 is a schematic diagram of a method for receiving an aperiodic channel state information reference signal according to an embodiment of the present invention. As shown in FIG4 , the method includes:

[0110] Operation 401: Receive first information carried by higher layer signaling, where the first information is at least used by the terminal device to determine a transmission configuration indication state for receiving an aperiodic channel state information reference signal; and

[0111] Operation 402: Receive the aperiodic channel state information reference signal (CSI-RS) based on the determined transmission configuration indicator state (TCI state).

[0112] In this application, the first information is at least used by the terminal device to determine a transmission configuration indication state (TCI state) for aperiodic channel state information reference signal (CSI-RS) reception, wherein:

[0113] The first information includes a first parameter and qcl-info, and the first parameter and qcl-info are both optional fields. For example, in a communication protocol, the first information includes the first parameter and qcl-info; the first information sent or received at a certain time may include at least one of the first parameter and qcl-info, or neither of them; or,

[0114] The first information includes a first parameter, a second parameter and qcl-info, and the first parameter, the second parameter and qcl-info are optional fields. For example, in the communication protocol, the first information includes the first parameter, the second information and qcl-info; the first information sent or received at a certain time may include at least one of the first parameter, the second parameter and qcl-info, or none of the three.

[0115] According to the above embodiment, the transmission configuration indication state applied when the terminal device receives the non-periodic CSI-RS is clarified, so the ambiguity in the process of receiving the non-periodic CSI-RS can be reduced, thereby improving the reliability of system transmission.

[0116] In operations 401 and 402 of the present application, the determined transmission configuration indication state (TCI state) refers to the transmission configuration indication state (TCI state) determined based on the first information. The determined transmission configuration indication state (TCI state) includes:

[0117] Indicated TCI state, or TCI state configured in qcl-info.

[0118] The indicated TCI state is, for example, the TCI state indicated by the DCI after the above steps 1 to 3.

[0119] In the present application, the first information is, for example, a high-layer parameter CSI-AssociatedReportConfigInfo. In addition, the first information may also be other information.

[0120] Below, this application is further described in conjunction with specific embodiments.

[0121] Example 1

[0122] In embodiment 1, the first parameter may be applyIndicatedTCIState-r18. In addition, the first parameter may also be other parameters.

[0123] In embodiment 1, the first information includes a first parameter and qcl-info, and both the first parameter and qcl-info are optional fields.

[0124] In some examples, the first information includes the first parameter and qcl-info as optional fields, for example: the first information includes the first parameter.

[0125] In some of these examples, the first information does not include qcl-info, thereby reducing signaling overhead. In addition, the present application is not limited thereto. For example, in some of these examples, the first information may also include qcl-info.

[0126] In some of these examples, the value of the first parameter is at least used to determine the transmission configuration indication state (TCI state) of the indication. For example:

[0127] The value of the first parameter is a first value, and the transmission configuration indication state (TCI state) is a transmission configuration indication state (TCI state) of the first indication; and / or

[0128] The value of the first parameter is a second value, and the transmission configuration indication state (TCI state) is a transmission configuration indication state (TCI state) of the second indication.

[0129] In some other examples, the first information includes the first parameter and qcl-info as optional fields, for example, the first information includes qcl-info, and the first information does not include the first parameter.

[0130] In some other examples, the determined transmission configuration indication state (TCI state) is the transmission configuration indication state (TCI state) configured in the qcl-info.

[0131] In some other examples, the first information includes the first parameter and qcl-info as optional fields, for example, the first information does not include the first parameter and qcl-info.

[0132] In some of these examples, the determined transmission configuration indication state (TCI state) is a default indicated transmission configuration indication state (TCI state), or the terminal device determines that an error occurs.

[0133] The default indicated transmission configuration indication state (TCI state) is the first indicated transmission configuration indication state (TCI state) or the second indicated transmission configuration indication state (TCI state).

[0134] Below, Example 1 is described with examples in conjunction with specific implementation methods.

[0135] In some embodiments:

[0136] If the first information (e.g., the higher-layer parameter CSI-AssociatedReportConfigInfo) configures the first parameter (e.g., applyIndicatedTCIState-r18), the indicated TCI state is applied aperiodically according to the value of applyIndicatedTCIState-r18;

[0137] If applyIndicatedTCIState-r18 is not configured in the first information, the TCI state configured in qcl-info is applied to the non-periodic CSI-RS.

[0138] Specifically, if applyIndicatedTCIState-r18 is configured in CSI-AssociatedReportConfigInfo, the terminal device applies the indicated TCI state to the aperiodic CSI-RS according to the value of applyIndicatedTCIState-r18, for example:

[0139] If the value of applyIndicatedTCIState-r18 indicates the first indicated joint / downlink TCI state, for example, the value is 'the first', the terminal device applies the first indicated joint / downlink TCI state to the aperiodic CSI-RS;

[0140] If the value of applyIndicatedTCIState-r18 indicates the second indicated joint / downlink TCI state, for example, the value is 'the second', the terminal device applies the second indicated joint / downlink TCI state to the aperiodic CSI-RS.

[0141] When applyIndicatedTCIState-r18 is configured, qcl-info can be configured in CSI-AssociatedReportConfigInfo or not. If qcl-info is configured in CSI-AssociatedReportConfigInfo, the qcl-info configuration information is ignored. However, to save signaling overhead, qcl-info can be omitted when applyIndicatedTCIState-r18 is configured.

[0142] If applyIndicatedTCIState-r18 is not configured, the terminal applies the TCI state configured in qcl-info to the aperiodic CSI-RS.

[0143] In addition, if applyIndicatedTCIState-r18 and qcl-info are not configured in CSI-AssociatedReportConfigInfo, the terminal device determines that an error occurs (for example, the terminal device does not want applyIndicatedTCIState-r18 and qcl-info to be configured), or the terminal device applies the default indicated TCI state to the non-periodic CSI-RS. The default indicated transmission configuration indication state (TCI state) can be a first indicated transmission configuration indication state (TCI state) or a second indicated transmission configuration indication state (TCI state).

[0144] As shown in Table 1 below:

[0145] Table 1

[0146] Example 2

[0147] In embodiment 2, the first parameter may be applyIndicatedTCIState-r18, or other parameters. The second parameter may be followUnifiedTCI-StateCSI-r18, or other parameters.

[0148] In embodiment 2, the first information includes a first parameter, a second parameter, and qcl-info, and the first parameter, the second parameter, and qcl-info are all optional fields.

[0149] In some examples, the first information includes the first parameter, the second parameter, and QCL-info as optional fields, for example, the first information includes the second parameter and the first parameter. In these examples, the first information does not include QCL-info, thereby reducing signaling overhead. In addition, the present application is not limited to this. For example, in these examples, the first information may also include QCL-info.

[0150] In some of these examples, the value of the first parameter is at least used to determine the transmission configuration indication state (TCI state). For example:

[0151] The value of the first parameter is a first value, and the transmission configuration indication state (TCI state) is the transmission configuration indication state (TCI state) of the first indication; and / or

[0152] The value of the first parameter is the second value, and the transmission configuration indication state (TCI state) is the transmission configuration indication state (TCI state) of the second indication.

[0153] In some other examples, the first information includes the first parameter, the second parameter, and qcl-info as optional fields, for example, the first information includes the second parameter, and the first information does not include the first parameter.

[0154] In some other examples, the first information does not include qcl-info, thereby reducing signaling overhead. In addition, the present application is not limited thereto. For example, in some other examples, the first information may also include qcl-info.

[0155] In some other examples, the determined transmission configuration indication state (TCI state) is a default indicated transmission configuration indication state (TCI state).

[0156] The default indicated transmission configuration indication state (TCI state) is the first indicated transmission configuration indication state (TCI state) or the second indicated transmission configuration indication state (TCI state).

[0157] In some other examples, the first information includes the first parameter, the second parameter, and qcl-info as optional fields, for example, the first information includes qcl-info and does not include the second parameter. The first information may include the first parameter or not include the first parameter.

[0158] In some of these examples, the determined transmission configuration indication state (TCI state) is the transmission configuration indication state (TCI state) configured in the qcl-info.

[0159] In some further examples, the first information includes the first parameter, the second parameter, and qcl-info as optional fields, for example, the first information does not include the second parameter, and the first information does not include qcl-info. The first information may include the first parameter or not.

[0160] In some further examples, the determined transmission configuration indication state (TCI state) is a default indicated transmission configuration indication state (TCI state), or the terminal device determines that an error occurs.

[0161] The default indicated transmission configuration indication state (TCI state) is the first indicated transmission configuration indication state (TCI state) or the second indicated transmission configuration indication state (TCI state).

[0162] The following describes Example 2 with reference to specific implementation methods.

[0163] In some embodiments:

[0164] A second parameter is introduced into the first information (for example, the high-level parameter CSI-AssociatedReportConfigInfo). The second parameter can be a new parameter. For example, the new parameter is named followUnifiedTCI-StateCSI-r18. If followUnifiedTCI-StateCSI-r18 is configured in the high-level parameter CSI-AssociatedReportConfigInfo, then followUnifiedTCI-StateCSI-r18 can have only one value, for example, the value is 'enabled', as shown in Table 2 below.

[0165] Table 2

[0166] If the new parameter followUnifiedTCI-StateCSI-r18 is configured in CSI-AssociatedReportConfigInfo (for example, followUnifiedTCI-StateCSI-r18 is configured as 'enabled'), regardless of whether qcl-info is configured in CSI-AssociatedReportConfigInfo, the terminal device applies the indicated TCI state to the aperiodic CSI-RS according to the value of applyIndicatedTCIState-r18. For example:

[0167] If the value of applyIndicatedTCIState-r18 indicates the first indicated joint / downlink TCI state, for example, the value is 'the first', the terminal device applies the first indicated joint / downlink TCI state to the aperiodic CSI-RS;

[0168] If the value of applyIndicatedTCIState-r18 indicates the second indicated joint / downlink TCI state, for example, the value is 'the second', the terminal device applies the second indicated joint / downlink TCI state to the aperiodic CSI-RS.

[0169] If the new parameter followUnifiedTCI-StateCSI-r18 is configured in CSI-AssociatedReportConfigInfo, but applyIndicatedTCIState-r18 is not configured, the default indicated transmission configuration indication state (TCI state) is applied to the aperiodic CSI-RS. The default indicated transmission configuration indication state (TCI state) can be the first indicated transmission configuration indication state (TCI state) or the second indicated transmission configuration indication state (TCI state).

[0170] If the new parameter followUnifiedTCI-StateCSI-r18 is not configured in CSI-AssociatedReportConfigInfo, but qcl-info is configured in CSI-AssociatedReportConfigInfo, the TCI state configured in qcl-info is applied to the aperiodic CSI-RS.

[0171] If the new parameter followUnifiedTCI-StateCSI-r18 is not configured in CSI-AssociatedReportConfigInfo, and qcl-info is not configured in CSI-AssociatedReportConfigInfo, the terminal device determines that an error occurs (for example, the terminal device does not want to applyIndicatedTCIState-r18 and qcl-info are not configured), or the terminal device applies the default indicated TCI state to the non-periodic CSI-RS. The default indicated transmission configuration indication state (TCI state) can be the first indicated transmission configuration indication state (TCI state) or the second indicated transmission configuration indication state (TCI state).

[0172] FIG5 is another schematic diagram of a method for receiving an aperiodic channel state information reference signal according to an embodiment of the present application. As shown in FIG5 , the method includes:

[0173] Operation 501: Receive radio resource control signaling and first information carried by higher layer signaling, wherein the radio resource control signaling is configured with a third parameter, and the first information is not configured with a first parameter; and

[0174] Operation 502: Receive an aperiodic channel state information reference signal (CSI-RS) based on a default indicated transmission configuration indication state (TCI state).

[0175] In operation 501: the first information is, for example, a high-level parameter CSI-AssociatedReportConfigInfo. In addition, the first information may also be other information; the first parameter may be applyIndicatedTCIState-r18. In addition, the first parameter may also be other parameters; the third parameter may be followUnifiedTCI-State, which is used to indicate whether the terminal device applies the indicated transmission configuration indication state (indicated TCI state) to the non-periodic CSI-RS.

[0176] In operation 502, the default indicated transmission configuration indication state (TCI state) is the first indicated transmission configuration indication state (TCI state) or the second indicated transmission configuration indication state (TCI state).

[0177] FIG6 is another schematic diagram of a method for receiving an aperiodic channel state information reference signal according to an embodiment of the present application. As shown in FIG6 , the method includes:

[0178] Operation 601, receiving radio resource control signaling and first information carried by high-layer signaling, wherein the radio resource control signaling is not configured with a third parameter, the first information is used by the terminal device to determine a transmission configuration indication state (TCI state) for aperiodic channel state information reference signal (CSI-RS) reception, and the first information includes qcl-info, which is an optional field; and

[0179] Operation 602: Receive an aperiodic channel state information reference signal (CSI-RS) based on the confirmed transmission configuration indication state (TCI state).

[0180] In operation 601: the first information is, for example, a high-level parameter CSI-AssociatedReportConfigInfo. In addition, the first information may also be other information; the first parameter may be applyIndicatedTCIState-r18. In addition, the first parameter may also be other parameters; the third parameter may be followUnifiedTCI-State, which is used to indicate whether the terminal device applies the indicated transmission configuration indication state (indicated TCI state) to the non-periodic CSI-RS.

[0181] In one embodiment of operation 601, the first information includes qcl-info as an optional field, for example, the first information includes qcl-info, wherein the determined transmission configuration indication state (TCI state) is the transmission configuration indication state (TCI state) configured in qcl-info.

[0182] In another embodiment of operation 601, the first information includes qcl-info as an optional field, for example, the first information does not include qcl-info. The determined transmission configuration indication state (TCI state) is a default indicated transmission configuration indication state (TCI state), or the terminal device determines that an error occurs.

[0183] In operation 601, the default indicated transmission configuration indication state (TCI state) is the first indicated transmission configuration indication state (TCI state) or the second indicated transmission configuration indication state (TCI state).

[0184] Next, the method shown in FIG. 5 and FIG. 6 is further described in conjunction with Example 3.

[0185] Example 3

[0186] In some implementations of Example 3, a third parameter of radio resource control signaling (RRC) may be used to indicate to the terminal device whether to apply the indicated TCI state to the aperiodic CSI-RS. The third parameter may be, for example, followUnifiedTCI-State. In addition, the third parameter may also be other parameters in RRC.

[0187] In some examples of embodiment 3, if the parameter followUnifiedTCI-State is configured in RRC (for example, followUnifiedTCI-State is configured as 'enabled'), and the first parameter (for example, the first parameter is applyIndicatedTCIState-r18) is configured in the first information (for example, the high-level parameter CSI-AssociatedReportConfigInfo), then regardless of whether qcl-info is configured in the first information (for example, the high-level parameter CSI-AssociatedReportConfigInfo), the terminal device applies the indicated TCI state to the non-periodic CSI-RS according to the value of the first parameter (for example, applyIndicatedTCIState-r18) in the first information. For example:

[0188] If the value of applyIndicatedTCIState-r18 indicates the first indicated joint / downlink TCI state, for example, the value is 'the first', the terminal device applies the first indicated joint / downlink TCI state to the aperiodic CSI-RS;

[0189] If the value of applyIndicatedTCIState-r18 indicates the second indicated joint / downlink TCI state, for example, the value is 'the second', the terminal device applies the second indicated joint / downlink TCI state to the aperiodic CSI-RS.

[0190] In some further examples of Example 3, if the parameter followUnifiedTCI-State is configured in RRC (for example, followUnifiedTCI-State is configured as 'enabled') and the first parameter is not configured in the first information (for example, the first parameter is applyIndicatedTCIState-r18), the default indicated TCI state is applied to the non-periodic CSI-RS.

[0191] In other examples of Example 3, if the parameter followUnifiedTCI-State is not configured in the RRC, and qcl-info is configured in the first information (for example, the high-level parameter CSI-AssociatedReportConfigInfo), the terminal device applies the TCI state configured in qcl-info to the non-periodic CSI-RS.

[0192] In some further examples of Example 3, if the parameter followUnifiedTCI-State is not configured in the RRC, and qcl-info is not configured in the first information (for example, the high-layer parameter CSI-AssociatedReportConfigInfo), the terminal device applies the default indicated TCI state to the non-periodic CSI-RS, or the terminal device determines that an error has occurred. The default indicated transmission configuration indication state (TCI state) is the first indicated transmission configuration indication state (TCI state) or the second indicated transmission configuration indication state (TCI state).

[0193] The embodiment of the first aspect of the present application clarifies the TCI state applied when the terminal device receives the non-periodic CSI-RS, eliminates the ambiguity when receiving the non-periodic CSI-RS, and can effectively improve the reliability of the system transmission.

[0194] Embodiments of the second aspect

[0195] The second embodiment of the present application provides an apparatus for receiving an aperiodic channel state information reference signal, which is applied to a terminal device, such as the terminal device 302 in Figure 3. The apparatus corresponds to the method for receiving an aperiodic channel state information reference signal in the first embodiment.

[0196] FIG7 is a schematic diagram of an apparatus for receiving aperiodic channel state information reference signal in an embodiment of the second aspect. As shown in FIG7 , an apparatus 700 for receiving aperiodic channel state information reference signal includes a first receiver 701 and a second receiver 702 .

[0197] The first receiver 701 receives first information carried by high-layer signaling, and the first information is at least used by the terminal device to determine the transmission configuration indication state for receiving the non-periodic channel state information reference signal, wherein the first information includes a first parameter and qcl-info, and the first parameter and qcl-info are optional fields, or the first information includes a first parameter, a second parameter and qcl-info, and the first parameter, the second parameter and qcl-info are optional fields; the second receiver 702 receives the non-periodic channel state information reference signal based on the determined transmission configuration indication state.

[0198] In at least some embodiments, the determined transmission configuration indicates a state including:

[0199] The indicated transport configuration indicates the status, or the transport configuration indicated in qcl-info.

[0200] In at least some embodiments, the first information includes a first parameter and qcl-info as optional fields, for example:

[0201] The first information includes a first parameter.

[0202] The value of the first parameter is at least used to determine the transmission configuration indication state.

[0203] In at least some embodiments, the value of the first parameter is a first value, and the transmission configuration indication state is a transmission configuration indication state of the first indication; and / or

[0204] The value of the first parameter is a second value, and the transmission configuration indication state is a transmission configuration indication state of the second indication.

[0205] In at least some embodiments, the first information does not include qcl-info.

[0206] In at least some embodiments, the first information includes a first parameter and qcl-info as optional fields, for example:

[0207] The first information includes qcl-info, and the first information does not include the first parameter.

[0208] The determined transmission configuration indication state is the transmission configuration indication state configured in the qcl-info.

[0209] In at least some embodiments, the first information includes a first parameter and qcl-info as optional fields, for example:

[0210] The first information does not include the first parameter and qcl-info.

[0211] The determined transmission configuration indication state is a default indicated transmission configuration indication state, or the terminal device determines that an error occurs.

[0212] In at least some embodiments, the default indicated transmission configuration indication state is the first indicated transmission configuration indication state or the second indicated transmission configuration indication state.

[0213] In at least some embodiments, the first information includes a first parameter, a second parameter, and qcl-info as optional fields, for example:

[0214] The first information includes the second parameter and the first parameter.

[0215] The value of the first parameter is at least used to determine the transmission configuration indication state.

[0216] In at least some embodiments, the value of the first parameter is a first value, and the transmission configuration indication state is a transmission configuration indication state of the first indication; and / or

[0217] The value of the first parameter is a second value, and the transmission configuration indication state is a transmission configuration indication state of the second indication.

[0218] In at least some embodiments, the first information includes a first parameter, a second parameter, and qcl-info as optional fields, for example:

[0219] The first information includes the second parameter, and the first information does not include the first parameter.

[0220] The determined transmission configuration indication state is a default indicated transmission configuration indication state.

[0221] In at least some embodiments, the first information does not include qcl-info.

[0222] In at least some embodiments, the default indicated transmission configuration indication state is the first indicated transmission configuration indication state or the second indicated transmission configuration indication state.

[0223] In at least some embodiments, the first information includes a first parameter, a second parameter, and qcl-info as optional fields, for example:

[0224] The first information includes qcl-info, and the first information does not include the second parameter.

[0225] The determined transmission configuration indication state is the transmission configuration indication state configured in the qcl-info.

[0226] In at least some embodiments, the first information includes a first parameter, a second parameter, and qcl-info as optional fields, for example:

[0227] The first information does not include the second parameter and qcl-info.

[0228] The determined transmission configuration indication state is a default indicated transmission configuration indication state, or the terminal device determines that an error occurs.

[0229] In at least some embodiments, the default indicated transmission configuration indication state is the first indicated transmission configuration indication state or the second indicated transmission configuration indication state.

[0230] FIG8 is another schematic diagram of an apparatus for receiving an aperiodic channel state information reference signal in an embodiment of the second aspect. As shown in FIG8 , an apparatus 800 for receiving an aperiodic channel state information reference signal includes:

[0231] a third receiver 801 configured to receive radio resource control signaling and first information carried by higher layer signaling, wherein the radio resource control signaling is configured with a third parameter and the first information is not configured with the first parameter; and

[0232] The fourth receiver 802 receives an aperiodic channel state information reference signal based on a default indicated transmission configuration indication state.

[0233] The default indicated transmission configuration indication state is the first indicated transmission configuration indication state or the second indicated transmission configuration indication state.

[0234] FIG9 is another schematic diagram of an apparatus for receiving an aperiodic channel state information reference signal in an embodiment of the second aspect. As shown in FIG9 , an apparatus 900 for receiving an aperiodic channel state information reference signal includes:

[0235] A fifth receiver 901 receives radio resource control signaling and first information carried by higher-layer signaling, wherein the radio resource control signaling is not configured with a third parameter, the first information is used by the terminal device to determine a transmission configuration indication state for receiving an aperiodic channel state information reference signal, and the first information includes qcl-info, where qcl-info is an optional field; and

[0236] The sixth receiver 902 receives an aperiodic channel state information reference signal based on the confirmed transmission configuration indication state.

[0237] In at least some embodiments, the first information includes qcl-info as an optional field, for example:

[0238] The first information includes qcl-info.

[0239] The determined transmission configuration indication state is the transmission configuration indication state configured in the qcl-info.

[0240] In at least some embodiments, the first information includes qcl-info as an optional field, for example:

[0241] The first information does not include qcl-info.

[0242] The determined transmission configuration indication state is a default transmission configuration indication state, or the terminal device determines that an error has occurred. The default transmission configuration indication state is a first transmission configuration indication state or a second transmission configuration indication state.

[0243] The embodiment of the second aspect of the present application clarifies the TCI state applied when the terminal device receives the non-periodic CSI-RS, eliminates the ambiguity when receiving the non-periodic CSI-RS, and can effectively improve the reliability of the system transmission.

[0244] Embodiments of the third aspect

[0245] An embodiment of the third aspect of the present application provides a communication system, which may include a network device and a terminal device.

[0246] Figure 10 is a schematic diagram of an electronic device according to an embodiment of the third aspect. As shown in Figure 10 , electronic device 1000 may correspond to terminal device 302 in Figure 3 . Electronic device 1000 may include a processor 1010 and a memory 1020; memory 1020 stores data and programs and is coupled to processor 1010. It should be noted that this figure is exemplary; other types of structures may be used to supplement or replace this structure to implement telecommunication functions or other functions.

[0247] For example, the processor 1010 may be configured to execute a program to implement the method in the embodiment of the first aspect.

[0248] As shown in Figure 10 , the terminal device 1000 may further include: a communication module 1030, an input unit 1040, a display 1050, and a power supply 1060. The functions of these components are similar to those in the prior art and are not described in detail here. It is worth noting that the terminal device 1000 does not necessarily include all of the components shown in Figure 10 , and these components are not essential. Furthermore, the terminal device 1000 may also include components not shown in Figure 10 , for which reference may be made to the prior art.

[0249] An embodiment of the present application also provides a computer program, wherein when the program is executed in a terminal device, the program causes the terminal device to execute the method in the embodiment of the first aspect.

[0250] An embodiment of the present application also provides a storage medium storing a computer program, wherein the computer program enables a terminal device to execute the method in the embodiment of the first aspect.

[0251] The above devices and methods of the present application can be implemented by hardware or by a combination of hardware and software. The present application relates to such a computer-readable program that, when executed by a logic component, enables the logic component to implement the devices or components described above, or enables the logic component to implement the various methods or steps described above. The present application also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, etc.

[0252] The method / device described in conjunction with the embodiments of the present application can be directly embodied as hardware, a software module executed by a processor, or a combination of the two. For example, one or more of the functional block diagrams shown in the figure and / or one or more combinations of functional block diagrams can correspond to various software modules of the computer program flow or to various hardware modules. These software modules can respectively correspond to the various steps shown in the figure. These hardware modules can be implemented by solidifying these software modules, for example, using a field programmable gate array (FPGA).

[0253] The software module may be located in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. A storage medium may be coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium may be an integral part of the processor. The processor and the storage medium may be located in an ASIC. The software module may be stored in the memory of the mobile terminal or in a memory card that can be inserted into the mobile terminal. For example, if the device (such as a mobile terminal) uses a large-capacity MEGA-SIM card or a large-capacity flash memory device, the software module may be stored in the MEGA-SIM card or the large-capacity flash memory device.

[0254] One or more of the functional blocks and / or one or more combinations of functional blocks described in the accompanying drawings may be implemented as a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or any appropriate combination thereof for performing the functions described in this application. One or more of the functional blocks and / or one or more combinations of functional blocks described in the accompanying drawings may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in communication with a DSP, or any other such configuration.

[0255] The present application has been described above in conjunction with specific embodiments. However, those skilled in the art should understand that these descriptions are merely illustrative and are not intended to limit the scope of protection of the present application. Those skilled in the art may make various modifications and variations to the present application based on the spirit and principles of the present application, and such modifications and variations are also within the scope of the present application.

[0256] Regarding the implementation methods including the above embodiments, the following additional notes are also disclosed:

[0257] 1. A method for receiving an aperiodic channel state information reference signal, applied to a terminal device, the method comprising:

[0258] Receiving first information carried by high-layer signaling, where the first information is used at least by the terminal device to determine a transmission configuration indication state for reception of an aperiodic channel state information reference signal, wherein the first information includes a first parameter and qcl-info, and the first parameter and qcl-info are optional fields, or the first information includes a first parameter, a second parameter, and qcl-info, and the first parameter, the second parameter, and qcl-info are optional fields; and

[0259] The aperiodic channel state information reference signal is received based on the determined transmission configuration indication state.

[0260] 2. The method as described in Note 1, wherein the first information includes the first parameter and qcl-info, including:

[0261] The first information includes a first parameter,

[0262] The value of the first parameter is at least used to determine the transmission configuration indication state.

[0263] 3. The method as described in Note 1, wherein the first information includes the first parameter and qcl-info, including:

[0264] The first information includes qcl-info, and the first information does not include the first parameter,

[0265] The determined transmission configuration indication state is the transmission configuration indication state configured in the qcl-info.

[0266] 4. The method as described in Note 1, wherein the first information includes the first parameter and qcl-info, including:

[0267] The first information does not include the first parameter and qcl-info,

[0268] The determined transmission configuration indication state is a default indicated transmission configuration indication state, or the terminal device determines that an error occurs.

[0269] 5. The method as described in Note 1, wherein the first information includes the first parameter, the second parameter, and qcl-info, including:

[0270] The first information includes the second parameter and the first parameter,

[0271] The value of the first parameter is at least used to determine the transmission configuration indication state.

[0272] 6. The method according to Note 1, wherein the first information includes the first parameter, the second parameter, and qcl-info, including:

[0273] The first information includes the second parameter, and the first information does not include the first parameter,

[0274] The determined transmission configuration indication state is a default indicated transmission configuration indication state.

[0275] 7. The method according to Note 1, wherein the first information includes the first parameter, the second parameter, and qcl-info, including:

[0276] The first information includes qcl-info, and the first information does not include the second parameter,

[0277] The determined transmission configuration indication state is the transmission configuration indication state configured in the qcl-info.

[0278] 8. The method according to Note 1, wherein the first information includes the first parameter, the second parameter, and qcl-info, including:

[0279] The first information does not include the second parameter and qcl-info,

[0280] The determined transmission configuration indication state is a default indicated transmission configuration indication state, or the terminal device determines that an error occurs.

[0281] 9. A method for receiving an aperiodic channel state information reference signal, applied to a terminal device, the method comprising:

[0282] receiving radio resource control signaling and first information carried by higher layer signaling, wherein the radio resource control signaling is configured with a third parameter and the first information is not configured with the first parameter; and

[0283] An aperiodic channel state information reference signal is received based on a default indicated transmission configuration indication state.

[0284] 10. A method for receiving an aperiodic channel state information reference signal, applied to a terminal device, the method comprising:

[0285] Receiving radio resource control signaling and first information carried by higher-layer signaling, wherein the radio resource control signaling is not configured with a third parameter, the first information is used by the terminal device to determine a transmission configuration indication state for aperiodic channel state information reference signal reception, and the first information includes qcl-info, which is an optional field; and

[0286] An aperiodic channel state information reference signal is received based on the confirmed transmission configuration indication state.

Claims

1. A device for receiving a non-periodic channel state information reference signal, applied to a terminal device, the device comprising: A first receiver, which receives first information carried by high-layer signaling, wherein the first information is at least used by the terminal device to determine a transmission configuration indication state for receiving a non-periodic channel state information reference signal, wherein the first information includes a first parameter and qcl-info, and the first parameter and qcl-info are optional fields, or the first information includes a first parameter, a second parameter and qcl-info, and the first parameter, the second parameter and qcl-info are optional fields; and A second receiver is configured to receive the aperiodic channel state information reference signal based on the determined transmission configuration indication state.

2. The device according to claim 1, wherein: The determined transmission configuration indication state includes: The indicated transport configuration indicates the status, or the transport configuration indicated in qcl-info.

3. The device according to claim 1, wherein: The first information includes the first parameter and qcl-info, including: The first information includes a first parameter, The value of the first parameter is at least used to determine the transmission configuration indication state.

4. The device as claimed in claim 3, wherein: The value of the first parameter is a first value, and the transmission configuration indication state is a transmission configuration indication state of a first indication; and / or The value of the first parameter is a second value, and the transmission configuration indication state is a transmission configuration indication state of the second indication.

5. The device according to claim 3, wherein: The first information does not include qcl-info.

6. The device according to claim 1, wherein: The first information includes the first parameter and qcl-info, including: The first information includes qcl-info, and the first information does not include the first parameter, The determined transmission configuration indication state is the transmission configuration indication state configured in the qcl-info.

7. The apparatus according to claim 1, wherein the first information comprises a first parameter and qcl-info, including: The first information does not include the first parameter and qcl-info, The determined transmission configuration indication state is a default indicated transmission configuration indication state, or the terminal device determines that an error occurs.

8. The device according to claim 7, wherein: The default indicated transmission configuration indication state is the first indicated transmission configuration indication state or the second indicated transmission configuration indication state.

9. The apparatus according to claim 1, wherein the first information comprises a first parameter, a second parameter and qcl-info, including: The first information includes the second parameter and the first parameter, The value of the first parameter is at least used to determine the transmission configuration indication state.

10. The device of claim 9, wherein: The value of the first parameter is a first value, and the transmission configuration indication state is a transmission configuration indication state of a first indication; and / or The value of the first parameter is a second value, and the transmission configuration indication state is a transmission configuration indication state of the second indication.

11. The apparatus according to claim 1, wherein the first information comprises a first parameter, a second parameter and qcl-info, including: The first information includes the second parameter, and the first information does not include the first parameter, The determined transmission configuration indication state is a default indicated transmission configuration indication state.

12. The device of claim 11, wherein: The first information does not include qcl-info.

13. The device of claim 11, wherein: The default indicated transmission configuration indication state is the first indicated transmission configuration indication state or the second indicated transmission configuration indication state.

14. The apparatus according to claim 1, wherein the first information comprises a first parameter, a second parameter and qcl-info, including: The first information includes qcl-info, and the first information does not include the second parameter, The determined transmission configuration indication state is the transmission configuration indication state configured in the qcl-info.

15. The device according to claim 1, wherein the first information comprises a first parameter, a second parameter and qcl-info, including: The first information does not include the second parameter and qcl-info, The determined transmission configuration indication state is a default indicated transmission configuration indication state, or the terminal device determines that an error occurs.

16. The device of claim 15, wherein: The default indicated transmission configuration indication state is the first indicated transmission configuration indication state or the second indicated transmission configuration indication state.

17. A device for receiving a non-periodic channel state information reference signal, applied to a terminal device, the device comprising: a third receiver configured to receive radio resource control signaling and first information carried by high-layer signaling, wherein the radio resource control signaling is configured with a third parameter and the first information is not configured with the first parameter; and A fourth receiver receives a non-periodic channel state information reference signal based on a default indicated transmission configuration indication state.

18. A device for receiving a non-periodic channel state information reference signal, applied to a terminal device, the device comprising: a fifth receiver, which receives radio resource control signaling and first information carried by high-layer signaling, wherein the radio resource control signaling is not configured with a third parameter, the first information is used by the terminal device to determine a transmission configuration indication state for receiving a non-periodic channel state information reference signal, and the first information includes qcl-info, and the qcl-info is an optional field; and A sixth receiver is configured to receive a non-periodic channel state information reference signal based on the confirmed transmission configuration indication state.

19. The device of claim 18, wherein: The first information includes qcl-info, including: The first information includes qcl-info, The determined transmission configuration indication state is the transmission configuration indication state configured in the qcl-info.

20. The apparatus of claim 18, wherein: The first information includes qcl-info, including: The first information does not include qcl-info, The determined transmission configuration indication state is a default indicated transmission configuration indication state, or the terminal device determines that an error occurs.

Images