Method, apparatus, and communication device for determining the default beam

Abstract

The present disclosure provides a method, an apparatus, and a communication device for determining a default beam, which belong to the wireless communication technical field. Here, the method includes a step of a terminal device receiving a first DCI carried on a first PDCCH, and a step of determining a default beam based on one or more TCI states corresponding to a second PDCCH in response to determining that a transmission beam cannot be determined based on the first DCI. In this way, even though the DCI does not indicate a transmission beam, the terminal device can determine a default beam, and therefore can communicate with a network side device based on the default beam, thereby improving the communication success rate.

Description

Technical Field

[0001] The present disclosure relates to the field of wireless communication technologies, and particularly to a method, apparatus, and communication device for determining a default beam.

Background Art

[0002] In NR (New Radio, new wireless technology or new wireless interface), especially when the communication frequency band is in frequency range 2, due to the rapid attenuation of high-frequency channels, beam-based transmission and reception can be used to ensure signal coverage. Currently, beam indication signaling is transmitted to a terminal device via a network-side device, and the terminal device determines a transmission beam and / or a reception beam based on the beam indication signaling.

[0003] Here, the beam indication signaling includes MAC CE (Medium Access Control-Control Element) signaling and DCI (Downlink Control Information) signaling in the R15 / 16 protocol, and the beam for transmitting PDSCH (Physical Downlink Shared Channel) is indicated by the TCI (Transmission Configuration Indication) status indication field of the DCI signaling.

[0004] Of course, when there is no TCI status indication field in the DCI carried by the PDCCH (Physical Downlink Control Channel) transmitted from the network-side device, it is extremely important how the terminal device determines the transmission beam.

Summary of the Invention

Means for Solving the Problems

[0005] An embodiment of a first aspect of the present disclosure provides a method for determining a default beam, the method comprising: receiving first downlink control information (DCI) carried over a first physical downlink control channel (PDCCH); and determining a default beam based on one or more transmit setting instruction (TCI) states corresponding to a second PDCCH, in response to determining that a transmit beam cannot be determined based on the first DCI.

[0006] Selectively, in response to the absence of a TCI field in the first DCI, it is determined that the transmit beam cannot be determined based on the first DCI.

[0007] The step of determining a default beam based on one or more TCI states corresponding to the second PDCCH, which can be selected, includes the steps of determining one or more default TCI states based on one or more TCI states corresponding to the second PDCCH, and determining the default beam based on the one or more default TCI states.

[0008] Selectively, the second PDCCH corresponds to one TCI state, and the one TCI state is a TCI state corresponding to the control resource set (CORESET) corresponding to the second PDCCH.

[0009] Selectively, the second PDCCH corresponds to a plurality of TCI states, and the second PDCCH corresponds to a CORESET and / or a search space set (SS set) associated with the CORESET, and the CORESET corresponds to a plurality of TCI states, and the plurality of TCI states corresponding to the PDCCH are the plurality of TCI states corresponding to the CORESET, or the second PDCCH corresponds to a CORESET and / or a plurality of SS sets associated with the CORESET, and the CORESET corresponds to a plurality of TCI states, and the plurality of TCI states corresponding to the PDCCH are the plurality of TCI states corresponding to the CORESET, or the second PDCCH corresponds to a plurality of CORESETs and / or a plurality of SS sets, and each of the plurality of CORESETs corresponds to a single TCI state, and the plurality of TCI states corresponding to the PDCCH are the plurality of TCI states corresponding to the plurality of CORESETs.

[0010] The step of selecting one or more default TCI states based on a plurality of TCI states corresponding to the second PDCCH includes the step of determining the one or more default TCI states based on the IDs of the plurality of TCI states corresponding to the second PDCCH.

[0011] The step of selecting one or more default TCI states based on a plurality of TCI states corresponding to the second PDCCH includes the steps of obtaining the attribute value of the CORESET corresponding to the second PDCCH, and determining the one or more default TCI states based on the attribute value of the CORESET corresponding to the second PDCCH.

[0012] Selectively, the attribute value of the CORESET includes at least one of the following: the ID of the CORESET, the ID of the SS SET associated with the CORESET, and the CORESETPoolindex of the CORESET.

[0013] The default TCI states can be selected from a plurality of options, and the method further includes the step of mapping between the plurality of default beams and the plurality of transmit timings in a sequence mapping or loop mapping manner.

[0014] Selectively, the second PDCCH is the first PDCCH.

[0015] Selectively, the CORESET corresponding to the second PDCCH is the CORESET with the smallest ID within the nearest time unit monitoring the SS set, and the one or more TCI states corresponding to the second PDCCH are the one or more TCI states corresponding to the CORESET with the smallest ID.

[0016] The selectable configuration includes at least one of the following: the CORESETPoolindex of the CORESET having the smallest ID is the same as the CORESETPoolindex of the CORESET corresponding to the first PDCCH; and the CORESET having the smallest ID is the CORESET having the smallest ID among the CORESETs corresponding to one TCI state.

[0017] Selectively, one or more TCI states corresponding to the second PDCCH are one or more TCI states corresponding to the specified codepoints in the TCI state fields included in the DCI format corresponding to the first DCI.

[0018] Selectively, the specified Codepoint is at least one of the following: the smallest Codepoint among multiple Codepoints, the smallest Codepoint among multiple Codepoints corresponding to one TCI state, or the smallest Codepoint among multiple Codepoints corresponding to two TCI states.

[0019] Selectively, one or more TCI states corresponding to the second PDCCH are TCI states indicated by the second DCI for most recently indicating a TCI state, the second DCI being carried by the second PDCCH.

[0020] Embodiments of a second aspect of the present disclosure provide another method for determining a default beam, the method comprising the steps of transmitting a first DCI carried on a first PDCCH to a terminal device, wherein the terminal device determines a transmit beam based on the first DCI and, in response to determining that it cannot determine a transmit beam based on the first DCI, determines a default beam based on one or more TCI states corresponding to a second PDCCH.

[0021] Embodiments of a third aspect of the present disclosure provide a default beam determination device, which includes a receiving module for receiving a first DCI carried on a first PDCCH, and a determination module for determining a default beam based on one or more TCI states corresponding to a second PDCCH in response to determining that a transmit beam cannot be determined based on the first DCI.

[0022] Embodiments of a fourth aspect of the present disclosure provide another default beam determination apparatus, which includes a transmitting module for transmitting a first DCI carried on a first PDCCH to a terminal device, the terminal device determining a transmit beam based on the first DCI and, in response to determining that it is not possible to determine a transmit beam based on the first DCI, determining a default beam based on one or more TCI states corresponding to a second PDCCH.

[0023] An embodiment of a fifth aspect of the present disclosure provides a communication device comprising a transceiver, a memory, and a processor connected to the transceiver and the memory, respectively, wherein the processor is configured to control the transmission and reception of radio signals by executing computer-executable instructions in the memory, and to implement a default beam determination method provided in an embodiment of a first aspect of the present disclosure, or a default beam determination method provided in an embodiment of a second aspect of the present disclosure.

[0024] A sixth embodiment of the present disclosure provides a computer storage medium in which computer-executable instructions are stored, and when the computer-executable instructions are executed by a processor, a method for determining a default beam provided by a first embodiment of the present disclosure or a method for determining a default beam provided by a second embodiment of the present disclosure can be implemented.

[0025] A seventh embodiment of the present disclosure provides a computer program product which includes a computer program which, when executed by a processor, implements a default beam determination method provided by an embodiment of a first embodiment of the present disclosure or a default beam determination method provided by an embodiment of a second embodiment of the present disclosure.

[0026] A default beam determination method, apparatus, and communication device provided by embodiments of the present disclosure receive a first DCI carried over a first PDCCH via a terminal device and, in response to determining that a transmit beam cannot be determined based on the first DCI, determines a default beam based on one or more TCI states corresponding to a second PDCCH. This allows the terminal device to determine a default beam even though the DCI does not indicate a transmit beam, and therefore communicate with network-side devices based on the default beam, thereby improving the success rate of communication.

[0027] Additional aspects and advantages of the present disclosure will be given in part from the following description, some of which will become apparent from the following description, or will be understood by the practice of the present disclosure.

Brief Description of the Drawings

[0028] The above and / or additional aspects and advantages of the present disclosure will become apparent and easier to understand from the description of the embodiments combined with the following drawings. Here, [Figure 1] It is a flowchart of a method for determining a default beam provided by an embodiment of the present disclosure. [Figure 2] It is a flowchart of another method for determining a default beam provided by an embodiment of the present disclosure. [Figure 3] It is a flowchart of another method for determining a default beam provided by an embodiment of the present disclosure. [Figure 4] It is a flowchart of another method for determining a default beam provided by an embodiment of the present disclosure. [Figure 5] It is a flowchart of another method for determining a default beam provided by an embodiment of the present disclosure. [Figure 6] It is a flowchart of another method for determining a default beam provided by an embodiment of the present disclosure. [Figure 7] It is a flowchart of another method for determining a default beam provided by an embodiment of the present disclosure. [Figure 8] It is a flowchart of another method for determining a default beam provided by an embodiment of the present disclosure. [Figure 9] It is a flowchart of another method for determining a default beam provided by an embodiment of the present disclosure. [Figure 10] It is a schematic structural diagram of a device for determining a default beam provided by an embodiment of the present disclosure. [Figure 11] It is a schematic structural diagram of a device for determining a default beam provided by an embodiment of the present disclosure. [Figure 12] This is a block diagram of a terminal device provided by the embodiments of this disclosure. [Figure 13] This is a schematic diagram of the structure of a network-side device provided by the embodiments of this disclosure. [Modes for carrying out the invention]

[0029] Herein, exemplary embodiments are described, and these examples are shown in the drawings. Where the following description relates to the drawings, unless otherwise indicated, the same configuration in different drawings represents the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the embodiments of the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the embodiments of the present disclosure described in detail in the appended claims.

[0030] The terms used in the embodiments of this disclosure are for the purpose of describing specific embodiments and are not intended to limit the embodiments of this disclosure. Unless otherwise clearly indicated in the context, the singular forms “one kind” and “the” used in the embodiments of this disclosure and the appended claims also include the plural forms. The term “and / or” as used herein refers to and includes any or all possible combinations of one or more related and enumerated items.

[0031] In the embodiments of this disclosure, various pieces of information may be described using terms such as First, Second, Third, etc., but it should be understood that this information should not be limited to these terms. These terms are used solely to distinguish information of the same type from one another. For example, as long as it does not deviate from the scope of the embodiments of this disclosure, First Information may also be called Second Information, and similarly, Second Information may also be called First Information. Depending on the context, the terms “if” and “if” as used herein may be interpreted as “when” or “if” or “in response to deciding.”

[0032] The following describes embodiments of the present disclosure, examples of which are shown in the drawings, and from beginning to end, the same or similar reference numerals represent the same or similar reference elements. The embodiments described below with reference to the drawings are illustrative and used to illustrate the present disclosure and should not be understood as limiting the present disclosure.

[0033] Currently, beam instruction signaling is transmitted to terminal equipment via network-side devices, and terminal equipment determines the transmit beam and / or receive beam based on the beam instruction signaling.

[0034] Here, beam indication signaling in the R15 / 16 protocol includes MAC CE (Medium Access Control-Control Element) signaling and DCI (Downlink Control Information) signaling. Beams transmitting PDCCH, PDSCH, or downlink reference signals (also known as TCI status, QCL (Quasi Co-Location) Type D) can be indicated using the TCI status indication field of MAC CE and / or DCI signaling. For beams transmitting PUSCH, PUCCH, or uplink reference signals, spatialrelationinfo or spatial setting may be used.

[0035] However, if the DCI carried by the PDCCH transmitted from the network-side device does not have a TCI status indicator field, or if the time interval between the PDCCH (Physical Downlink Control Channel) and the PDSCH is shorter than the preset time duration, the terminal device cannot obtain the TCI status of the PDSCH in a timely manner. In this case, it is necessary to determine the default beam to transmit the PDSCH based on a predefined rule.

[0036] In one embodiment of the present disclosure, the default beam transmitting the PDSCH can be determined by the following method: Method 1: The PDSCH is the same as the beam indicated by the TCI state corresponding to the PDCCH that schedules it. Method 2: Monitor the SS set (search space set) which is the same as the beam indicated by the TCI state corresponding to the CORESET with the smallest CORESET ID within the most recent elapsed time unit (time slot). Method 3 further restricts the CORESET in Method 2 to be the same as the CORESETPoolindex of the CORESET corresponding to the PDCCH that schedules the PDSCH (provided that the default TCI state of each CORESETPoolIndex is enabled). Method 4: When two default TCI states are enabled, the DCI format is the same as the beam indicated by the two TCI states, where the Codepoint corresponding to the two TCI states in the bit area of ​​the indicated TCI state is the Codepoint with the smallest Codepoint, and which two TCI states correspond to which Codepoint, and which two TCI states correspond to the smallest Codepoint, can be indicated by MAC CE signaling.

[0037] However, if two TCI states are set for the CORESET with the smallest CORESET ID, or if two TCI states are set for the PDCCH that schedules the PDSCH, how to determine the default beam to transmit the PDSCH is a problem that needs to be solved.

[0038] To address the above issues, this disclosure provides a method, apparatus, and communication device for determining the default beam.

[0039] Figure 1 is a flowchart of a default beam determination method provided by an embodiment of the present disclosure. This default beam determination method can be applied to a terminal device.

[0040] Here, terminal equipment is a device that provides voice and / or data communication to the user, and may be a handheld device with wireless connectivity, or other processing device connected to a wireless modem. In different systems, the name of UE may differ; for example, in a 5G system, terminal equipment may be called UE (User Equipment). Here, wireless terminal equipment can communicate with one or more CNs (Core Networks) via a RAN (Radio Access Network), and wireless terminal equipment may be mobile terminal equipment such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal device, for example, a portable, pocket, handheld, computer-integrated or vehicle-mounted mobile device, which exchange language and / or data with the radio access network.

[0041] For example, a terminal device may be a PCS (Personal Communication Service) telephone, a cordless telephone, a SIP (Session Initiated Protocol) telephone, a WLL (Wireless Local Loop) station, a PDA (Personal Digital Assistant), or other similar device. A wireless terminal device may also be called a system, subscriber unit, subscriber station, mobile station, mobile, remote station, access point, remote terminal, access terminal, user terminal, user agent, or user device, and is not limited to the embodiments of this disclosure.

[0042] As shown in Figure 1, the method for determining the default beam may include the following steps 101 to 102.

[0043] Step 101: Receive the first DCI carried on the first PDCCH.

[0044] In the embodiments of this disclosure, the first DCI may be transmitted from a network-side device.

[0045] Here, a base station is given as an example of a network-side device. A base station can include multiple cells that provide services for UEs (User Equipment, user devices). Depending on the specific application scenario, each cell may also include multiple TRPs (Transmission Reception Points or Transmit / Receive Points), each TRP may include one or more antenna panels, or it may be a device that communicates with wireless terminal equipment via one or more sectors in the air interface of an access network, or it may have a different name. For example, the base station in the embodiment of this disclosure may be a Base Transceiver Station (BTS) in GSM (Global System for Mobile communications) or CDMA (Code Division Multiple Access), a NodeB in WCDMA (Wide-band Code Division Multiple Access) (registered trademark), an evolutionary Node B (abbreviated as eNB or e-NodeB) in an LTE (long term evolution) system, a 5G base station (abbreviated as gNB) in a 5G network architecture (next generation system), a Home evolved Node B (HeNB), a relay node, a femto, a pico base station, etc., and is not limited to the embodiment of this disclosure.

[0046] In the embodiments of this disclosure, the terminal device can receive a first DCI transmitted from a network-side device, where the first DCI is carried over a first PDCCH.

[0047] Step 102, in response to determining that the transmit beam cannot be determined based on the first DCI, a default beam is determined based on one or more TCI states corresponding to the second PDCCH.

[0048] In embodiments of the present disclosure, the default beam can be used for transmitting at least one of the following: PDSCH (Physical Downlink Shared Channel), PUSCH (Physical Uplink Shared Channel), PUCCH (Physical Uplink Control Channel), and a reference signal, where the reference signal may include CSI-RS (Channel State Information Reference Signal) or SRS (Sounding Reference Signal). The reference signal may be a periodic, non-periodic, or quasi-static semi-persistent reference signal.

[0049] In embodiments of the present disclosure, the terminal device can determine whether it can determine a transmit beam based on a first DCI. If it can determine a transmit beam based on the first DCI, it can communicate with the network-side device using the determined transmit beam. If it cannot determine a transmit beam based on the first DCI, it can determine a default beam based on one or more TCI states corresponding to a second PDCCH. This allows the terminal device to determine a default beam even if the DCI does not indicate a transmit beam, and therefore communicate with the network-side device based on the default beam, thereby improving the success rate of communication.

[0050] The default beam determination method of the embodiments of the present disclosure receives a first DCI carried on a first PDCCH via a terminal device and, in response to determining that a transmit beam cannot be determined based on the first DCI, determines a default beam based on one or more TCI states corresponding to a second PDCCH. This allows the terminal device to determine a default beam even though the DCI does not indicate a transmit beam, and therefore communicate with network-side devices based on the default beam, thereby improving the success rate of communication.

[0051] An embodiment of the present disclosure provides another method for determining a default beam, and Figure 2 is a flowchart of the other method for determining a default beam provided by an embodiment of the present disclosure. This default beam determination method can be applied to a terminal device. This default beam determination method may be performed independently, in combination with any one embodiment of the present disclosure or a possible implementation in an embodiment, or in combination with any one technical proposal in the related art.

[0052] As shown in Figure 2, the method for determining the default beam may include the following steps 201 to 203.

[0053] Step 201: Receive the first DCI carried on the first PDCCH.

[0054] In the embodiments of this disclosure, step 201 can be implemented using any one of the embodiments of this disclosure, and the embodiments of this disclosure are not limited thereto, and further details are omitted.

[0055] Step 202, in response to the absence of a TCI field in the first DCI, it is determined that the transmit beam cannot be determined based on the first DCI.

[0056] In embodiments of the present disclosure, in response to the absence of a TCI field (which may also be called a TCI state field) in the first DCI, the terminal device may determine that it cannot determine the transmit beam based on the first DCI.

[0057] In one possible embodiment of the embodiments of the present disclosure, if the first DCI does not have a TCI field (which may also be called a TCI state field) and the time interval between the first PDCCH and the corresponding PDSCH is greater than or equal to a preset time length, the terminal device may determine that it cannot determine the transmit beam based on the first DCI.

[0058] In one embodiment of the present disclosure, the preset time length is a preset, and for example, the preset time length may be a timeduration.

[0059] In another embodiment of the present disclosure, the preset time duration is set by the network-side device, and for example, the preset time duration may be a timeduration.

[0060] Step 203: Determine the default beam based on one or more TCI states corresponding to the second PDCCH.

[0061] In the embodiments of this disclosure, the second PDCCH may be a PDCCH carrying the first DCI, that is, the second PDCCH and the first PDCCH may be the same PDCCH.

[0062] In embodiments of the present disclosure, the default beam can be determined based on one or more TCI states corresponding to the second PDCCH.

[0063] In one possible implementation of the embodiments of this disclosure, if the second PDCCH corresponds to one TCI state, the beam indicated by that TCI state can be designated as a default beam.

[0064] In another possible embodiment of the embodiments of the present disclosure, if the second PDCCH corresponds to multiple TCI states, one TCI state can be designated from the multiple TCI states, and the beam indicated by the designated TCI state can be designated as one default beam, or the beams indicated by multiple TCI states in the multiple TCI states can be designated as multiple default beams.

[0065] The default beam determination method of the embodiments of the present disclosure receives a first DCI carried on a first PDCCH via a terminal device and, in response to determining that a transmit beam cannot be determined based on the first DCI, determines a default beam based on one or more TCI states corresponding to a second PDCCH. This allows the terminal device to determine a default beam even though the DCI does not indicate a transmit beam, and therefore communicate with network-side devices based on the default beam, thereby improving the success rate of communication.

[0066] These possible implementations may be carried out individually or in combination, and the embodiments of this disclosure are not limited thereto.

[0067] An embodiment of the present disclosure provides another method for determining a default beam, and Figure 3 is a flowchart of the other method for determining a default beam provided by an embodiment of the present disclosure. The default beam determination method is applied to a terminal device. The default beam determination method may be performed independently, in combination with any one embodiment of the present disclosure or a possible implementation in an embodiment, or in combination with any one technical proposal in the related art.

[0068] As shown in Figure 3, the method for determining the default beam may include the following steps 301 to 303.

[0069] Step 301: Receive the first DCI carried on the first PDCCH.

[0070] In the embodiments of this disclosure, step 301 can be implemented in any one manner of any embodiment of this disclosure, and the embodiments of this disclosure are not limited thereto, and further details are omitted.

[0071] Step 302, in response to determining that the transmit beam cannot be determined based on the first DCI, one or more default TCI states are determined based on one or more TCI states corresponding to the second PDCCH.

[0072] Furthermore, the process for determining whether the transmission beam can be determined based on the first DCI in any of the aforementioned embodiments can also be applied to that embodiment, and a detailed explanation is omitted here.

[0073] In embodiments of the present disclosure, if the terminal device cannot determine the transmit beam based on the first DCI, it may determine one or more default TCI states based on one or more TCI states corresponding to the second PDCCH.

[0074] In one possible embodiment of the embodiments of this disclosure, the second PDCCH may correspond to a single TCI state, which may be a single TCI state corresponding to a CORESET corresponding to the second PDCCH. When the second PDCCH corresponds to a single TCI state, the single TCI state may be a single default TCI state.

[0075] In another possible embodiment of the embodiments of the present disclosure, the second PDCCH may also support multiple TCI states, and if the second PDCCH supports multiple TCI states, one TCI state may be selected from the multiple TCI states to be a single default TCI state, or multiple default TCI states may be determined based on the multiple TCI states.

[0076] Here, designating a single TCI state as a single default TCI state may be used to perform a single communication transmission or to perform multiple communication transmissions. Communication transmissions may include PDSCH, PUSCH, PUCCH, CSI-RS, SRS, etc.

[0077] Step 303: Determine the default beam based on one or more default TCI states.

[0078] The explanation of the default beam in the above embodiment is also applicable to this embodiment, and therefore a detailed explanation is omitted here.

[0079] In the embodiments of this application, when the terminal device determines one or more default TCI states, it can determine a default beam based on the one or more default TCI states, that is, the terminal device can set the beam indicated by the default TCI state as the default beam.

[0080] When there is one default TCI state, there is one default beam, and the terminal device can communicate with the network-side device using this single default beam. When there are multiple default TCI states, there are also multiple default beams, and mapping between the multiple default beams and multiple transmission timings can be performed using sequence mapping or loop mapping.

[0081] Here, the multiplexing scheme between multiple transmission timings can include at least one of TDM (Time Division Multiplexing), FDM (Frequency Division Multiplexing), or SDM (Space Division Multiplexing). That is, the resources occupied by the multiple transmission timings differ in at least one dimension: time-domain resources, frequency-domain resources, spatial resources (i.e., antenna ports), and beam direction.

[0082] In the embodiments of this disclosure, there are two typical values, but of course, other values ​​may also be used, and this disclosure is not limited thereto. The following explanation will use the example of there being two values.

[0083] As an example, let's explain the above by using the example of two instances instead of multiple. When the default beam is a beam indicated by two TCI states (referred to as the first TCI state and the second TCI state, respectively), and multiple transmission timings are set, assuming two transmission timings are set, loop mapping is used, meaning that consecutive different transmission timings correspond to different TCI states. Below, we will explain using the example of the default beam being the default beam used for PDSCH transmission. Note that the mapping method between the default beam and transmission timing can be applied to the default beam and used for other communication transmissions. Assuming there are four transmission timings, i.e., four PDSCH transmissions are required, for sequence mapping, the first and second transmissions can use the beam indicated by the first TCI state to transmit the PDSCH, and the third and fourth transmissions can use the beam indicated by the second TCI state to transmit the PDSCH. For loop mapping, the first and third transmissions can use the beam indicated by the first TCI state to transmit the PDSCH, and the second and fourth transmissions can use the beam indicated by the second TCI state to transmit the PDSCH.

[0084] For example, for a terminal device that supports two TCI states simultaneously, such as enableTwoDefaultTCI-States, PDSCH transmission can be performed using two default beams determined by the two default TCI states (i.e., the first TCI state and the second TCI state), and when there are two transmission timings, each default beam corresponds to one transmission timing. In TDM mode, if there are more than two transmission timings, the two default beams and the multiple transmission timings are mapped using sequence mapping or loop mapping.

[0085] For example, if a PDSCH only needs to be transmitted twice, one default TCI state can correspond to one transmission timing. For instance, the first transmission can use the beam indicated by the first TCI state, and the second transmission can use the beam indicated by the second TCI state. If the number of PDSCH transmissions is greater than two, for example, if a PDSCH needs to be transmitted four times, for sequence mapping, the first and second transmissions can use the beam indicated by the first TCI state, and the third and fourth transmissions can use the beam indicated by the second TCI state. For loop mapping, the first and third transmissions can use the beam indicated by the first TCI state, and the second and fourth transmissions can use the beam indicated by the second TCI state.

[0086] Furthermore, multiple transmission timings can be used for overlapping or non-overlapping transmissions, and this disclosure is not limited thereto. This point applies to all embodiments of this disclosure.

[0087] The default beam determination method of the embodiments of the present disclosure receives a first DCI carried on a first PDCCH by a terminal device and, in response to determining that a transmit beam cannot be determined based on the first DCI, determines a default beam based on one or more TCI states corresponding to a second PDCCH. This allows the terminal device to determine a default beam even though the DCI does not indicate a transmit beam, and therefore communicate with network-side devices based on the default beam, thereby improving the success rate of communication.

[0088] These possible implementations may be carried out individually or in combination, and the embodiments of this disclosure are not limited thereto.

[0089] An embodiment of the present disclosure provides another method for determining the default beam, and Figure 4 is a flowchart of the other method for determining the default beam provided by an embodiment of the present disclosure. The default beam determination method can be applied to a terminal device. The default beam determination method may be performed independently, in combination with any one embodiment of the present disclosure or a possible implementation in the embodiment, or in combination with any one technical proposal in the related art.

[0090] As shown in Figure 4, the method for determining the default beam may include the following steps 401 to 403.

[0091] Step 401: Receive the first DCI carried on the first PDCCH.

[0092] In the embodiments of this disclosure, step 401 can be implemented in any one manner of any embodiment of this disclosure, and the embodiments of this disclosure are not limited thereto, and further details are omitted.

[0093] Step 402, in response to determining that the transmit beam cannot be determined based on the first DCI, one or more default TCI states are determined based on the IDs of multiple TCI states corresponding to the second PDCCH.

[0094] Furthermore, the process for determining whether or not the transmitted beam can be identified based on the first DCI in any of the aforementioned embodiments can also be applied to this embodiment, and a detailed explanation is omitted here.

[0095] In the embodiments of this disclosure, the second PDCCH can correspond to multiple TCI states, where there are typically two, but of course there may be other numbers, and this disclosure is not limited thereto.

[0096] In one possible embodiment of the embodiments of the present disclosure, the second PDCCH corresponds to one CORESET and / or one SS set associated with the CORESET, where the CORESET corresponds to a plurality of TCI states, and the plurality of TCI states corresponding to the second PDCCH may also be a plurality of TCI states corresponding to the CORESET.

[0097] As an example, let us illustrate that there are two of the above multiples. The second PDCCH has two TCI states set, and these two TCI states can correspond to a similar CORESET, and / or these two TCI states can correspond to a similar SS set. For example, the two TCI states corresponding to the second PDCCH are TCI state #0 and TCI state #1, and both TCI state #0 and TCI state #1 correspond to CORESET #1, and / or both TCI state #0 and TCI state #1 correspond to SS set #1. SS set #1 is associated with CORESET #1.

[0098] In another possible embodiment of the embodiments of the present disclosure, the second PDCCH corresponds to one CORESET and / or a plurality of SS sets associated with the CORESET, where the CORESET corresponds to a plurality of TCI states, and the plurality of TCI states corresponding to the second PDCCH may be a plurality of TCI states corresponding to the CORESET.

[0099] As an example, let us illustrate that there are two instances of the above multiple instances. The second PDCCH has two TCI states set, and these two TCI states can correspond to the same CORESET, and / or these two TCI states can correspond to different SS sets. For example, the two TCI states corresponding to the second PDCCH are TCI state #0 and TCI state #1, and both TCI state #0 and TCI state #1 correspond to CORESET #1, and / or TCI state #0 corresponds to SS set #0, and TCI state #1 corresponds to SS set #1. Both SS set #0 and SS set #1 are related to CORESET #1.

[0100] In another possible embodiment of the embodiments of the present disclosure, the second PDCCH corresponds to a plurality of CORESETs and / or a plurality of SS sets, where each of the plurality of CORESETs corresponds to one TCI state, and the plurality of TCI states corresponding to the second PDCCH are the plurality of TCI states corresponding to the plurality of CORESETs.

[0101] As an example, let us illustrate that there are two instances of the above multiple instances. The second PDCCH has two TCI states set, and these two TCI states can correspond to different CORESETs, and / or these two TCI states can correspond to different SS sets. For example, the two TCI states corresponding to the second PDCCH are TCI state #0 and TCI state #1, respectively. TCI state #0 corresponds to CORESET #0, and TCI state #1 corresponds to CORESET #1, and / or TCI state #0 corresponds to SS set #0, and TCI state #1 corresponds to SS set #1. SS set #0 is associated with CORESET #0, and SS set #1 is associated with CORESET #1.

[0102] In one possible embodiment of the embodiments of the present disclosure, if the terminal device cannot determine the transmit beam based on the first DCI, it may determine a single default TCI state based on the IDs of a plurality of TCI states corresponding to the second PDCCH.

[0103] For example, the terminal device can determine the TCI state with the smallest ID based on the IDs of multiple TCI states corresponding to the second PDCCH, designate the TCI state with the smallest ID as a single designated TCI state, and designate the above designated TCI state as a single default TCI state.

[0104] In another possible embodiment of the embodiments of the present disclosure, if the terminal device cannot determine the transmit beam based on the first DCI, it may determine a plurality of default TCI states based on the IDs of a plurality of TCI states corresponding to the second PDCCH.

[0105] As an example, if we use the example of two instances of the above multiple instances, the second PDCCH has two TCI states set, and these two TCI states can be designated as two default TCI states. That is, regardless of the possible values ​​of the TCI state IDs, all TCI states corresponding to the second PDCCH are designated as default TCI states.

[0106] Step 403: Determine the default beam based on one or more default TCI states.

[0107] In the embodiments of this disclosure, step 403 can be implemented in any one manner of any embodiment of this disclosure, and the embodiments of this disclosure are not limited thereto, and further details are omitted.

[0108] The default beam determination method of the embodiments of the present disclosure receives a first DCI carried on a first PDCCH by a terminal device and, in response to determining that a transmit beam cannot be determined based on the first DCI, determines a default beam based on one or more TCI states corresponding to a second PDCCH. This allows the terminal device to determine a default beam even though the DCI does not indicate a transmit beam, and therefore communicate with network-side devices based on the default beam, thereby improving the success rate of communication.

[0109] These possible implementations may be carried out individually or in combination, and the embodiments of this disclosure are not limited thereto.

[0110] An embodiment of the present disclosure provides another method for determining a default beam, and Figure 5 is a flowchart of the other method for determining a default beam provided by an embodiment of the present disclosure. The default beam determination method can be applied to a terminal device. The default beam determination method may be performed independently, in combination with any one embodiment of the present disclosure or a possible implementation in an embodiment, or in combination with any one technical proposal in the related art.

[0111] As shown in Figure 5, the method for determining the default beam may include the following steps 501 to 504.

[0112] Step 501: Receive the first DCI carried on the first PDCCH.

[0113] In the embodiments of this disclosure, step 501 can be implemented in any one manner of any embodiment of this disclosure, and the embodiments of this disclosure are not limited thereto, and further details are omitted.

[0114] Step 502, in response to determining that the transmit beam cannot be determined based on the first DCI, obtain the attribute value of the CORESET corresponding to the second PDCCH.

[0115] Furthermore, the process for determining whether the transmission beam can be determined based on the first DCI in any of the aforementioned embodiments can also be applied to this embodiment, and a detailed explanation is omitted here.

[0116] In embodiments of the present disclosure, the second PDCCH may be one or more, i.e., transmitting the same DCI signaling at multiple second PDCCH transmission timings, and the disclosure is not limited thereto. If there are multiple second PDCCHs, the multiple second PDCCHs may be PDCCHs with the same time-frequency resources but different beams, or the multiple second PDCCHs may be PDCCHs with different time-domain resources, or the multiple second PDCCHs may be PDCCHs with different frequency-domain resources, and are not limited thereto.

[0117] In embodiments of this disclosure, if the terminal device cannot determine the transmit beam based on the first DCI, it can obtain the attribute value of the CORESET corresponding to the second PDCCH. Optionally, the attribute value of the CORESET may include at least one of the following: the CORESET ID, the ID of the SS set associated with the CORESET, and the CORESETPoolindex (pool index) of the CORESET.

[0118] Step 503: Determine one or more default TCI states based on the attribute values ​​of the CORESET corresponding to the second PDCCH.

[0119] In one possible embodiment of the embodiments of the present disclosure, a terminal device can determine a default TCI state based on the attribute value of the CORESET corresponding to a second PDCCH, for example, the terminal device can determine a specified TCI state based on the attribute value of the CORESET corresponding to a second PDCCH, and the specified TCI state can be set as a default TCI state.

[0120] In another possible embodiment of the embodiments of this disclosure, the terminal device can determine a number of TCI states based on the attribute values ​​of the CORESET corresponding to the second PDCCH.

[0121] One possible implementation is that, if the attribute value of CORESET is the ID of CORESET, the terminal device can determine one or more default TCI states based on the ID of CORESET corresponding to the second PDCCH.

[0122] In one example, the terminal device can determine the CORESET with the smallest ID based on the ID of the CORESET corresponding to the second PDCCH, and set the TCI state corresponding to the CORESET with the smallest ID as a single designated TCI state, thereby setting this single designated TCI state as a single default TCI state.

[0123] For example, let us illustrate the case where there are two instances of the above multiple instances. The second PDCCH has two TCI states set, and these two TCI states can correspond to different CORESETs. For example, the two TCI states corresponding to the second PDCCH are TCI state #0 and TCI state #1, respectively. TCI state #0 corresponds to CORESET #0, and TCI state #1 corresponds to CORESET #1. Thus, the TCI state corresponding to the CORESET with the smaller ID between CORESET #0 and CORESET #1 can be designated as a single TCI state, and this designated single TCI state can be designated as a single default TCI state.

[0124] As another example, a terminal device can determine multiple default TCI states based on the CORESET ID corresponding to the second PDCCH.

[0125] For example, using the example of two instances of the above multiple instances, the second PDCCH has two TCI states set, and these two TCI states can be designated as two default TCI states. In other words, regardless of the possible values ​​of the CORESET ID, the TCI states corresponding to all CORESETs corresponding to the second PDCCH can be designated as default TCI states.

[0126] In another possible implementation, if the attribute value of CORESET is the ID of the SS set associated with that CORESET, the terminal device can determine one or more default TCI states based on the ID of the SS set associated with the CORESET corresponding to the second PDCCH.

[0127] As an example, the terminal device can determine the SS set with the smallest ID based on the ID of the SS set associated with the CORESET corresponding to the second PDCCH, and set the TCI state corresponding to the SS set with the smallest ID as a single designated TCI state, thereby setting this single designated TCI state as a single default TCI state.

[0128] For example, let us illustrate the case where there are two instances of the above multiple instances. The second PDCCH has two TCI states set, and these two TCI states correspond to the same CORESET and different SS sets. For example, the two TCI states corresponding to the second PDCCH are TCI state #0 and TCI state #1, and both TCI state #0 and TCI state #1 correspond to CORESET #1. TCI state #0 corresponds to SS set #0, and TCI state #1 corresponds to SS set #1. Thus, the TCI state corresponding to the SS set with the smaller ID among SS set #0 and SS set #1 can be designated as one TCI state, and therefore this designated TCI state can be designated as one default TCI state.

[0129] As another example, a terminal device can determine multiple default TCI states based on the ID of the SS set associated with the CORESET corresponding to the second PDCCH.

[0130] For example, using the example of two instances of the above multiple instances, the second PDCCH has two TCI states set, and these two TCI states can be designated as two default TCI states. That is, regardless of the possible values ​​of the SS set ID, the TCI states corresponding to all SS sets associated with the CORESET corresponding to the second PDCCH are designated as default TCI states.

[0131] As one implementation, when the attribute value of a CORESET is the CORESETPoolindex of that CORESET, the terminal device can determine one or more default TCI states based on the CORESETPoolindex of the CORESET corresponding to the second PDCCH.

[0132] As an example, the terminal device can determine the CORESET with the smallest CORESETPoolindex based on the CORESETPoolindex of the CORESET corresponding to the second PDCCH, and set the TCI state corresponding to the CORESET with the smallest CORESETPoolindex as a designated TCI state, and thus set this designated TCI state as a default TCI state, or set the TCI state corresponding to the smallest CORESETPoolindex as a designated TCI state, thereby setting this designated TCI state as a default TCI state.

[0133] For example, using the example of two instances of the above multiple instances, the second PDCCH has two TCI states set, these two TCI states correspond to different CORESETs, or these two TCI states correspond to different CORESETPoolindexes. Thus, the TCI state corresponding to the CORESET with the smaller CORESETPoolindex can be designated as one default TCI state, or the TCI state corresponding to the smaller CORESETPoolindex can be designated as one specified TCI state. Thus, this designated TCI state can be designated as one default TCI state.

[0134] In another example, the terminal device can determine multiple default TCI states based on the CORESETPoolindex of the CORESET corresponding to the second PDCCH.

[0135] For example, using the example of two instances of the above multiple instances, the second PDCCH has two TCI states set, and these two TCI states can be designated as two default TCI states. That is, regardless of the possible values ​​of CORESETPoolindex, the TCI states corresponding to all CORESETPoolindex instances corresponding to the second PDCCH are designated as default TCI states.

[0136] Step 504: Determine the default beam based on one or more default TCI states.

[0137] In the embodiments of this disclosure, step 504 can be implemented in any one manner of any embodiment of this disclosure, and the embodiments of this disclosure are not limited thereto, and further details are omitted.

[0138] The default beam determination method of the embodiments of the present disclosure receives a first DCI carried on a first PDCCH by a terminal device and, in response to determining that a transmit beam cannot be determined based on the first DCI, determines a default beam based on one or more TCI states corresponding to a second PDCCH. This allows the terminal device to determine a default beam even though the DCI does not indicate a transmit beam, and therefore communicate with network-side devices based on the default beam, thereby improving the success rate of communication.

[0139] These possible implementations may be carried out individually or in combination, and the embodiments of this disclosure are not limited thereto.

[0140] An embodiment of the present disclosure provides another method for determining the default beam, and Figure 6 is a flowchart of the other method for determining the default beam provided by an embodiment of the present disclosure. The default beam determination method can be applied to a terminal device. The default beam determination method may be performed independently, in combination with any one embodiment of the present disclosure or a possible implementation in the embodiment, or in combination with any one technical proposal in the related art.

[0141] As shown in Figure 6, the method for determining the default beam includes the following steps 601 to 602.

[0142] Step 601: Receive the first DCI carried on the first PDCCH.

[0143] In the embodiments of this disclosure, step 601 can be implemented in any one manner of any embodiment of this disclosure, and the embodiments of this disclosure are not limited thereto, and further details are omitted.

[0144] Step 602, in response to determining that the transmit beam cannot be determined based on the first DCI, a default beam is determined based on one or more TCI states corresponding to the second PDCCH, where the CORESET corresponding to the second PDCCH is the CORESET with the smallest ID in the nearest single time unit monitoring the SS set, and the one or more TCI states corresponding to the second PDCCH are the one or more TCI states corresponding to the CORESET with the smallest ID.

[0145] Furthermore, the process for determining whether the transmission beam can be determined based on the first DCI in any of the aforementioned embodiments can also be applied to this embodiment, and a detailed explanation is omitted here.

[0146] In embodiments of the present disclosure, if the transmit beam cannot be determined based on the first DCI, the terminal device monitors the CORESET having the smallest ID within the nearest time unit monitoring the SS set, and may set one or more TCI states corresponding to the CORESET having the smallest ID as one or more default TCI states, thereby allowing the beam indicated by the default TCI state to be set as the default beam.

[0147] For example, if the CORESET with the smallest ID corresponds to one TCI state, that one TCI state can be designated as one default TCI state, and the beam indicated by that default TCI state can be designated as one default beam.

[0148] In another example, when the CORESET with the smallest ID corresponds to multiple TCI states, one specified TCI state can be determined from the multiple TCI states, and that specified TCI state can be set as one default TCI state. Therefore, the beam indicated by that one default TCI state can be set as one default beam. Alternatively, multiple default TCI states can be determined from the multiple TCI states, and the beams indicated by the multiple default TCI states can be set as multiple default beams.

[0149] Furthermore, if the CORESET with the smallest ID corresponds to multiple TCI states, please refer to one of the above examples for the execution process that determines one or more default TCI states based on the multiple TCI states, and a detailed explanation is omitted here.

[0150] In one possible embodiment of the embodiments of this disclosure, the CORESETPoolindex of the CORESET having the smallest ID may be the same as the CORESETPoolindex of the CORESET corresponding to the first PDCCH.

[0151] Selectively, the terminal device monitors the CORESET with the smallest ID within the nearest time unit of the SS set and can set one or more TCI states corresponding to the CORESET with the smallest ID as one or more default TCI states, and the beam indicated by one or more default TCI states as one or more default beams. Here, the CORESETPoolindex of the CORESET with the smallest ID is the same as the CORESETPoolindex of the CORESET corresponding to the first PDCCH (the prerequisites are that the time interval between the first PDCCH and the corresponding PDSCH is smaller than a preset time length, or that the first DCI does not contain a TCI state field).

[0152] In another possible embodiment of the embodiments of this disclosure, the CORESET having the smallest ID may be the CORESET having the smallest ID among the CORESETs corresponding to a single TCI state.

[0153] In other words, in this disclosure, the terminal device monitors a CORESET that has the smallest ID within the nearest time unit of the SS set and has only one TCI state set, and can make the one TCI state corresponding to that CORESET a default TCI state, thereby making the beam indicated by the one default TCI state a default beam.

[0154] In another possible embodiment of the embodiments of this disclosure, the CORESET having the smallest ID may be the CORESET having the smallest ID among the CORESETs corresponding to a single TCI state, and the CORESETPoolindex of the CORESET having the smallest ID may be the same as the CORESETPoolindex of the CORESET corresponding to the first PDCCH.

[0155] The default beam determination method of the embodiments of the present disclosure receives a first DCI carried on a first PDCCH by a terminal device and, in response to determining that a transmit beam cannot be determined based on the first DCI, determines a default beam based on one or more TCI states corresponding to a second PDCCH. This allows the terminal device to determine a default beam even though the DCI does not indicate a transmit beam, and therefore communicate with network-side devices based on the default beam, thereby improving the success rate of communication.

[0156] These possible implementations may be carried out individually or in combination, and the embodiments of this disclosure are not limited thereto.

[0157] An embodiment of the present disclosure provides another method for determining a default beam, and Figure 7 is a flowchart of the other method for determining a default beam provided by an embodiment of the present disclosure. This default beam determination method can be applied to a terminal device. This default beam determination method may be performed independently, in combination with any one embodiment of the present disclosure or a possible implementation in an embodiment, or in combination with any one technical proposal in the related art.

[0158] As shown in Figure 7, the method for determining the default beam may include the following steps 701 to 702.

[0159] Step 701: Receive the first DCI carried on the first PDCCH.

[0160] In the embodiments of this disclosure, step 701 can be implemented in any one manner of any embodiment of this disclosure, and the embodiments of this disclosure are not limited thereto, and further details are omitted.

[0161] Step 702, in response to determining that the transmit beam cannot be determined based on the first DCI, a default beam is determined based on one or more TCI states corresponding to the second PDCCH, where one or more TCI states corresponding to the second PDCCH are one or more TCI states corresponding to a specified codepoint in the TCI state field contained in the DCI format corresponding to the first DCI.

[0162] Furthermore, the process for determining whether the transmission beam can be determined based on the first DCI in any of the aforementioned embodiments can also be applied to this embodiment, and a detailed explanation is omitted here.

[0163] In one possible implementation of the embodiments of this disclosure, the specified Codepoint is the smallest Codepoint among several Codepoints.

[0164] In another possible implementation of the embodiments of this disclosure, the specified Codepoint is the smallest Codepoint among a plurality of Codepoints corresponding to a single TCI state.

[0165] In another possible implementation of the embodiments of this disclosure, the specified Codepoint is the smallest Codepoint among a plurality of Codepoints corresponding to two TCI states.

[0166] In embodiments of this disclosure, the TCI state field is used for a beam that directs at least one communication transmission.

[0167] In embodiments of the present disclosure, a 1DCI may not carry a TCI state field (or TCI state indicator field), but MAC CE signaling has already enabled a correspondence between a specified Codepoint of the TCI state field in the DCI format corresponding to the 1DCI and one or more TCI states. Therefore, in embodiments of the present disclosure, if a terminal device cannot determine a transmit beam based on the 1DCI, it can determine a default beam based on one or more TCI states corresponding to a specified Codepoint of the TCI state field contained in the DCI format corresponding to the 1DCI.

[0168] Here, the TCI state corresponding to each Codepoint can be indicated via MAC CE signaling; that is, it can be determined based on MAC CE which TCI state each Codepoint corresponds to, or whether each Codepoint corresponds to multiple TCI states.

[0169] For details on the execution process for determining the default beam based on one or more TCI states, please refer to one of the above-mentioned embodiments; a detailed explanation is omitted here.

[0170] The default beam determination method of the embodiments of the present disclosure receives a first DCI carried on a first PDCCH by a terminal device and, in response to determining that a transmit beam cannot be determined based on the first DCI, determines a default beam based on one or more TCI states corresponding to a second PDCCH. This allows the terminal device to determine a default beam even though the DCI does not indicate a transmit beam, and therefore communicate with network-side devices based on the default beam, thereby improving the success rate of communication.

[0171] These possible implementations may be carried out individually or in combination, and the embodiments of this disclosure are not limited thereto.

[0172] An embodiment of the present disclosure provides another method for determining a default beam, and Figure 8 is a flowchart of the other method for determining a default beam provided by an embodiment of the present disclosure. This default beam determination method can be applied to a terminal device. This default beam determination method may be performed independently, in combination with any one embodiment of the present disclosure or a possible implementation in an embodiment, or in combination with any one technical proposal in the related art.

[0173] As shown in Figure 8, the method for determining the default beam includes the following steps 801 to 802.

[0174] Step 801: Receive the first DCI carried on the first PDCCH.

[0175] Step 802, in response to determining that the transmit beam cannot be determined based on the first DCI, a default beam is determined based on one or more TCI states corresponding to the second PDCCH, where the one or more TCI states corresponding to the second PDCCH are TCI states indicated by the second DCI to indicate the most recently indicated TCI state, and the second DCI is carried by the second PDCCH.

[0176] Furthermore, the process for determining whether the transmission beam can be determined based on the first DCI in any of the aforementioned embodiments can also be applied to this embodiment, and a detailed explanation is omitted here.

[0177] In embodiments of this disclosure, when a terminal device cannot determine a transmit beam based on a first DCI, it can determine the TCI state indicated by the second DCI for most recently indicating a TCI state, and then determine a default beam based on the TCI state indicated by the second DCI for most recently indicating a TCI state. For example, by setting the TCI state indicated by the second DCI for most recently indicating a TCI state as the default TCI state, the beam indicated by the default TCI state can be set as the default beam.

[0178] Here, the TCI state indicated by the second DCI can be called a general-purpose TCI state, and the beam indicated by the TCI state can be called a general-purpose beam. Here, a general-purpose beam can include uplink and downlink general-purpose beams, uplink general-purpose beams, or downlink general-purpose beams, where uplink and downlink general-purpose beams refer to the general-purpose beam being used for uplink and downlink transmissions, uplink general-purpose beams refer to the general-purpose beam being used for uplink transmissions but not for downlink transmissions, and downlink general-purpose beams refer to the general-purpose beam being used for downlink transmissions but not for uplink transmissions.

[0179] Here, a general-purpose TCI state means that the TCI state is applicable to all communication transmissions within a single general-purpose beam group, and communication transmissions include uplink communication transmissions and downlink communication transmissions, where uplink communication transmissions may include PUCCH (Physical Uplink Control Channel), PUSCH, SRS, DMRS (DeModulation Reference Signal), etc., and downlink communication transmissions may include PDCCH, PDSCH, CSI-RS, etc.

[0180] Here, if the default beam is used for uplink communication transmission, one or more TCI states corresponding to the second PDCCH may be the general-purpose beams for uplink and downlink or the TCI state corresponding to the uplink general-purpose beam. If the default beam is used for downlink communication transmission, one or more TCI states corresponding to the second PDCCH may be the general-purpose beams for uplink and downlink or the TCI state corresponding to the downlink general-purpose beam.

[0181] Here, the Codepoint of a general-purpose beam can indicate one TCI state, or it can indicate multiple TCI states (typically two TCI states). If the Codepoint of a general-purpose beam indicates one TCI state, that one TCI state can be designated as one default TCI state, and the beam indicated by the default TCI state is designated as one default beam. If the Codepoint of a general-purpose beam indicates multiple TCI states, one or more default TCI states can be determined based on the multiple TCI states, and the beam indicated by one or more default TCI states can be designated as one or more default beams. For the execution process of determining one or more default TCI states based on multiple TCI states, please refer to one of the above embodiments, and a detailed explanation is omitted here.

[0182] The default beam determination method of the embodiments of the present disclosure receives a first DCI carried on a first PDCCH by a terminal device and, in response to determining that a transmit beam cannot be determined based on the first DCI, determines a default beam based on one or more TCI states corresponding to a second PDCCH. This allows the terminal device to determine a default beam even though the DCI does not indicate a transmit beam, and therefore communicate with network-side devices based on the default beam, thereby improving the success rate of communication.

[0183] These possible implementations may be carried out individually or in combination, and the embodiments of this disclosure are not limited thereto.

[0184] As an example, taking the case where the communication transmission is a PDSCH transmission, a default beam for transmitting the PDSCH can be determined based on any one of the embodiments described above in this disclosure, thereby enabling the network-side device and the terminal device to use the same beam for PDSCH transmission and improving the success rate of PDSCH transmission.

[0185] An embodiment of the present disclosure provides another method for determining the default beam, and Figure 9 is a flowchart of the other method for determining the default beam provided by an embodiment of the present disclosure. This default beam determination method can be applied to network-side devices. This default beam determination method may be performed independently, in combination with any one embodiment of the present disclosure or a possible implementation in an embodiment, or in combination with any one technical proposal in the related technology.

[0186] As shown in Figure 9, the method for determining the default beam may include the following step 901.

[0187] Step 901, the first DCI carried on the first PDCCH is transmitted to the terminal device, where the terminal device determines the transmit beam based on the first DCI and, in response to determining that it cannot determine the transmit beam based on the first DCI, determines a default beam based on one or more TCI states corresponding to the second PDCCH.

[0188] Furthermore, the explanation of the method performed by the terminal device in any one of the embodiments described in Figures 1 to 8 above can also be applied to the method performed by the network-side device in that embodiment, and since the implementation principle is similar, a detailed explanation is omitted here.

[0189] An embodiment of the default beam determination method involves a network-side device transmitting a first DCI carried over a first PDCCH to a terminal device, the terminal device determining a transmit beam based on the first DCI, and in response to determining that it cannot determine a transmit beam based on the first DCI, determining a default beam based on one or more TCI states corresponding to a second PDCCH. This allows the terminal device to determine a default beam even if the DCI does not indicate a transmit beam, and therefore communicate with the network-side device based on the default beam, thereby improving the success rate of communication.

[0190] These possible implementations may be carried out individually or in combination, and the embodiments of this disclosure are not limited thereto.

[0191] Corresponding to the default beam determination method provided by the embodiments in Figures 1 to 8 above, the present disclosure further provides a default beam determination device, and since the default beam determination device provided by the embodiments of the present disclosure corresponds to the default beam determination method provided by the embodiments in Figures 1 to 8 above, embodiments of the default beam determination method can also be applied to the default beam determination device provided by embodiments of the present disclosure, and a detailed explanation of the embodiments of the present disclosure is omitted.

[0192] Figure 10 is a schematic diagram of the structure of a default beam determination device provided by an embodiment of the present disclosure. The device can be applied to a terminal device.

[0193] As shown in Figure 10, the default beam determination device 1000 may include a receiving module 1001 and a determination module 1002. The receiving module 1001 is used to receive the first DCI carried on the first PDCCH. The decision module 1002 is used to determine a default beam based on one or more TCI states corresponding to the second PDCCH, in response to determining that the transmit beam cannot be determined based on the first DCI.

[0194] Selectively, in response to the absence of a TCI field in the first DCI, it is determined that the transmit beam cannot be determined based on the first DCI.

[0195] Selectively, the determination module 1002 is used to determine one or more default TCI states based on one or more TCI states corresponding to the second PDCCH, and to determine the default beam based on one or more default TCI states.

[0196] Selectively, the second PDCCH corresponds to one TCI state, and that one TCI state corresponds to one TCI state corresponding to the control resource set (CORESET) that corresponds to the second PDCCH.

[0197] Selectively, the second PDCCH corresponds to multiple TCI states, and the second PDCCH corresponds to one CORESET and / or one search space set SS set associated with the CORESET, and the CORESET corresponds to multiple TCI states, and the multiple TCI states corresponding to the PDCCH are the multiple TCI states corresponding to the CORESET; the second PDCCH corresponds to one CORESET and / or multiple SS sets associated with the CORESET, and the CORESET corresponds to multiple TCI states, and the multiple TCI states corresponding to the PDCCH are the multiple TCI states corresponding to the CORESET; or the second PDCCH corresponds to multiple CORESETs and / or multiple SS sets, and each of the multiple CORESETs corresponds to one TCI state, and the multiple TCI states corresponding to the PDCCH are the multiple TCI states corresponding to the multiple CORESETs.

[0198] Selectively, the determination module 1002 determines one or more default TCI states based on the IDs of multiple TCI states corresponding to the second PDCCH.

[0199] Selectively, the determination module 1002 is used to obtain the attribute value of the CORESET corresponding to the second PDCCH and to determine one or more default TCI states based on the attribute value of the CORESET corresponding to the second PDCCH.

[0200] Selectable, the attribute value of a CORESET includes at least one of the following: the CORESET ID, the ID of the SS SET associated with the CORESET, or the CORESETPoolindex of the CORESET.

[0201] Multiple default TCI states are selectable, and mapping between multiple default beams and multiple transmit timings is performed using either sequence mapping or loop mapping.

[0202] Selectively, the second PDCCH is the first PDCCH.

[0203] Selectively, the CORESET corresponding to the second PDCCH is the CORESET with the smallest ID within the nearest time unit monitoring the SS set, and the one or more TCI states corresponding to the second PDCCH are the one or more TCI states corresponding to the CORESET with the smallest ID.

[0204] The selectable conditions include at least one of the following: the CORESETPoolindex of the CORESET with the smallest ID is the same as the CORESETPoolindex of the CORESET corresponding to the first PDCCH; and the CORESET with the smallest ID is the CORESET with the smallest ID among the CORESETs corresponding to a single TCI state.

[0205] Selectively, one or more TCI states corresponding to the second PDCCH are one or more TCI states corresponding to the specified codepoints in the TCI state fields included in the DCI format corresponding to the first DCI.

[0206] Selectively, the specified Codepoint includes at least one of the following: the smallest Codepoint among multiple Codepoints, the smallest Codepoint among multiple Codepoints corresponding to one TCI state, and the smallest Codepoint among multiple Codepoints corresponding to two TCI states.

[0207] Selectively, one or more TCI states corresponding to the second PDCCH are TCI states indicated by the second DCI to indicate the most recent TCI state, and the second DCI is carried by the second PDCCH.

[0208] The default beam determination device of the embodiment of the present disclosure receives a first DCI carried on a first PDCCH by a terminal device and, in response to determining that it is not possible to determine a transmit beam based on the first DCI, determines a default beam based on one or more TCI states corresponding to a second PDCCH. This allows the terminal device to determine a default beam even though the DCI does not indicate a transmit beam, and therefore communicate with network-side devices based on the default beam, thereby improving the success rate of communication.

[0209] Corresponding to the default beam determination method provided in the embodiment of Figure 9 above, the present disclosure further provides a default beam determination apparatus, the default beam determination apparatus provided in the embodiment of the present disclosure corresponds to the default beam determination method provided in the embodiment of Figure 9 above, and therefore embodiments of the default beam determination method can also be applied to the default beam determination apparatus provided in the embodiment of the present disclosure, and a detailed explanation of the embodiments of the present disclosure is omitted.

[0210] Figure 11 is a schematic diagram of the structure of another default beam determination device provided by an embodiment of the present disclosure. This device can be applied to a network-side device.

[0211] As shown in Figure 11, the default beam determination device 1100 may include a transmission module 1101. The transmitting module 1101 is used to transmit a first DCI to a terminal device, where the first DCI is carried over a first PDCCH, where the terminal device determines a transmit beam based on the first DCI, and in response to determining that it cannot determine a transmit beam based on the first DCI, determines a default beam based on one or more TCI states corresponding to a second PDCCH.

[0212] The default beam determination device of the embodiment of the present disclosure transmits a first DCI carried over a first PDCCH by a network-side device to a terminal device, the terminal device transmits a beam based on the first DCI, and in response to determining that it cannot determine a transmit beam based on the first DCI, determines a default beam based on one or more TCI states corresponding to a second PDCCH. This allows the terminal device to determine a default beam even though the DCI does not indicate a transmit beam, and therefore communicate with the network-side device based on the default beam, thereby improving the success rate of communication.

[0213] To realize the above embodiment, this disclosure further provides a communication device.

[0214] A communication device provided by an embodiment of the present disclosure includes a processor, a transceiver, memory, and a program stored in the memory and executable by the processor, wherein the processor implements the aforementioned method when executing the executable program.

[0215] The communication device may be the aforementioned terminal device or network-side device.

[0216] Here, the processor may include various types of storage media, which are non-temporary computer storage media that can continue to store information stored therein even after the communication device has been turned off. Here, the communication device includes terminal devices or network-side devices.

[0217] The aforementioned processor can be connected to memory via a bus or the like, and is used to read executable programs stored in memory, for example, at least one of those shown in Figures 1 to 9.

[0218] To realize the above embodiments, this disclosure further provides a computer storage medium.

[0219] A computer storage medium provided by the embodiments of this disclosure stores an executable program, which, after being executed by a processor, can implement any of the methods of the embodiments described above, for example, at least one of those shown in Figures 1 to 9.

[0220] Figure 12 is a block diagram of a terminal device 1200 provided by an embodiment of the present disclosure. For example, the terminal device 1200 may be a mobile phone, a computer, a digital broadcasting user device, a message transmission and reception device, a game console, a tablet terminal, a medical device, a fitness device, and a personal digital assistant.

[0221] In Figure 12, the terminal device 1200 may include one or more of the following: processing component 1202, memory 1204, power supply component 1206, multimedia component 1208, audio component 1210, input / output (I / O) interface 1212, sensor component 1214, and communication component 1216.

[0222] The processing component 1202 typically controls the overall operation of the device 1200, including operations related to display, telephone calling, data communication, camera operation, and recording. The processing component 1202 may include one or more processors 1220 for executing instructions to complete all or some of the steps of the above method. In addition, the processing component 1202 may include one or more modules to facilitate interaction with other components. For example, the processing component 1202 may include a multimedia module to facilitate interaction between the multimedia component 1208 and the processing component 1202.

[0223] Memory 1204 is configured to store various types of data, such as instructions for any application programs or methods operated on terminal device 1200, contact data, phonebook data, messages, photos, and videos, in order to support operations on terminal device 1200. Memory 1204 may be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, optical disk, etc.

[0224] The power supply component 1206 provides power for various components of the terminal device 1200. The power supply component 1206 may include a power management system, at least one power supply, and components related to generating, managing, and allocating power for other terminal devices 1200.

[0225] The multimedia component 1208 includes a screen that provides an output interface between the terminal device 1200 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touchscreen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, slides, and gestures on the touch panel. The touch sensors detect not only the boundary of a touch or slide operation, but also the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 1208 includes one front camera and / or a rear camera. When the terminal device 1200 is in an operating mode such as shooting mode or video mode, the front camera and / or rear camera may receive external multimedia data. Each front camera and rear camera may be a fixed optical lens system or may have a focal length and optical zoom capability.

[0226] The audio component 1210 is configured to output and / or input audio signals. For example, the audio component 1210 includes one microphone (MIC), and when the terminal device 1200 is in an operating mode such as calling mode, recording mode, and voice recognition mode, the microphone is configured to receive external audio signals. The received audio signals can be further stored in memory 1204 or transmitted via communication component 1216. In some embodiments, the audio component 1210 further includes one speaker for outputting audio signals.

[0227] The I / O interface 1212 provides an interface between the processing component 1202 and a peripheral interface module, which may be a keyboard, click wheel, buttons, etc. These buttons may include, but are not limited to, a home button, volume buttons, a start button, and a lock button.

[0228] The sensor component 1214 includes one or more sensors to provide various modes of state evaluation for the terminal device 1200. For example, the sensor component 1214 can detect the on / off state of the terminal device 1200, the relative positioning of components, for example, the display and keypad of the terminal device 1200, and the sensor component 1214 can also detect changes in the position of the terminal device 1200 or its components, whether or not a user is in contact with the terminal device 1200, the orientation or acceleration / deceleration of the terminal device 1200, and temperature changes of the terminal device 1200. The sensor component 1214 may also include proximity sensors configured to detect the presence of nearby objects in the absence of any physical contact. The sensor component 1214 may further include optical sensors, such as CMOS or CCD image sensors for use in imaging applications. In some embodiments, the sensor component 1214 may also include acceleration sensors, gyroscopes, magnetic sensors, pressure sensors, or temperature sensors.

[0229] The communication component 1216 is configured to facilitate wired or wireless communication between the device 1200 and other devices. The device 1200 can access wireless networks based on communication standards, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 1216 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 1216 further includes a Near Field Communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, Infrared Data Association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT)® technology, and other technologies.

[0230] In exemplary embodiments, the apparatus 1200 may be implemented by a dedicated integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing unit (DSPD), a programmable logic device (PLD), a field-programmable gate array (FPGA), a controller, a microcontroller, a microprocessor, or other electronic components, one or more applications, to perform the method shown in any one of Figures 1 to 8 above.

[0231] In exemplary embodiments, a non-temporary computer-readable storage medium containing instructions, for example, a memory 1204 containing instructions, is further provided, and the instructions may be executed by a processor 1220 of a terminal device 1200 to complete any one of the methods shown in Figures 1 to 8. For example, the non-temporary computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, or optical data storage device.

[0232] As shown in Figure 13, this is a schematic diagram of the structure of a network-side device provided by an embodiment of the present disclosure. Referring to Figure 13, the network-side device 1300 includes a processing component 1322, which further includes one or more processors and memory resources, including memory 1332, used to store instructions, such as applications, that are executed by the processing component 1322. An application stored in memory 1332 may include one or more modules, each corresponding to a set of instructions. The processing component 1322 is also configured to execute instructions in any manner applicable to the network device described above, for example, the method shown in Figure 9.

[0233] The network-side device 1300 may further include a power component 1326 configured to perform power management for the network-side device 1300, a wired or wireless network interface 1350 configured to connect the network-side device 1300 to a network, and an input / output (I / O) interface 1358. The network-side device 1300 can be operated based on an operating system stored in memory 732, such as Windows Server™, Mac OS X™, Unix™, Linux®™, FreeBSD™, or similar.

[0234] Those skilled in the art, after considering the specification and practicing the invention disclosed herein, will readily be able to imagine other embodiments of the invention. This disclosure is intended to cover any variations, uses, or adaptive changes of the invention, which include the general principles of the invention and include common or commonly used technical means of the art not disclosed herein. The specification and examples are to be considered merely illustrative, and the true scope and spirit of this disclosure are indicated by the following claims.

[0235] This disclosure is limited to the exact structure described above and shown in the drawings, and various modifications and changes can be made as long as they do not deviate from that scope. The scope of this disclosure is limited only to the attached claims.

Claims

1. A method for determining the default beam applied to a terminal device, The steps include receiving first downlink control information (DCI) carried over a first physical downlink control channel (PDCCH), The process includes the step of determining a default beam based on a plurality of transmit setting instruction (TCI) states corresponding to a second PDCCH, in response to determining that a transmit beam cannot be determined based on the first DCI, The default beam is applied to other uplink and / or downlink transmissions other than PDCCH. The step of determining the default beam based on a plurality of TCI states corresponding to the second PDCCH is: The steps include determining one or more default TCI states based on a plurality of TCI states corresponding to the second PDCCH, The step of determining the default beam based on the one or more default TCI states, The step of determining one or more default TCI states based on a plurality of TCI states corresponding to the second PDCCH is: A step of determining one or more default TCI states based on the IDs of a plurality of TCI states corresponding to the second PDCCH, Or, The process includes the steps of obtaining the attribute value of the CORESET corresponding to the second PDCCH, and determining the one or more default TCI states based on the attribute value of the CORESET corresponding to the second PDCCH, A method for determining the default beam, characterized by the following features.

2. In response to the absence of a TCI state field in the first DCI, it is determined that the transmit beam cannot be determined based on the first DCI. The method according to feature 1.

3. The second PDCCH corresponds to multiple TCI states, The second PDCCH corresponds to one CORESET and / or one search space set SS set associated with the CORESET, the CORESET corresponds to a plurality of TCI states, and the plurality of TCI states corresponding to the PDCCH are the plurality of TCI states corresponding to the CORESET. The second PDCCH corresponds to one CORESET and / or a plurality of SS sets associated with the CORESET, the CORESET corresponds to a plurality of TCI states, and the plurality of TCI states corresponding to the PDCCH are the plurality of TCI states corresponding to the CORESET. The second PDCCH corresponds to a plurality of CORESETs and / or a plurality of SS sets, each of the plurality of CORESETs corresponds to one TCI state, and the plurality of TCI states corresponding to the PDCCH are the plurality of TCI states corresponding to the plurality of CORESETs, including at least one of these: The method according to feature 1.

4. The attribute values ​​of the aforementioned CORESET are: CORESET ID, ID of SS SET related to CORESET, Including at least one of the CORESET Pool indexes of CORESET, The method according to feature 1.

5. The default TCI states are multiple, and the method is as follows: The process further includes the step of mapping between multiple default beams and multiple transmission timings using a sequence mapping or loop mapping method. The method according to feature 1.

6. The second PDCCH is the first PDCCH. The method according to any one of claims 1 to 5, characterized by the features described herein.

7. The CORESET corresponding to the second PDCCH is the CORESET with the smallest ID within the nearest time unit monitoring the SS set, and the multiple TCI states corresponding to the second PDCCH are the multiple TCI states corresponding to the CORESET with the smallest ID. The method according to any one of claims 1 to 5, characterized by the features described herein.

8. The CORESETPoolindex of the CORESET having the smallest ID is the same as the CORESETPoolindex of the CORESET corresponding to the first PDCCH. The CORESET having the smallest ID is the CORESET having the smallest ID among the CORESETs corresponding to a single TCI state, and includes at least one of these: The method according to feature 7.

9. The multiple TCI states corresponding to the second PDCCH are: These are multiple TCI states corresponding to a specified code point in the TCI state field included in the DCI format corresponding to the first DCI, The method according to any one of claims 1 to 5, characterized by the features described herein.

10. The aforementioned specified Codepoint is, The smallest Codepoint among multiple Codepoints, The smallest Codepoint among multiple Codepoints corresponding to a single TCI state, At least one of the smallest Codepoints among multiple Codepoints corresponding to the two TCI states, The method according to feature 9.

11. The multiple TCI states corresponding to the second PDCCH are: The most recently indicated TCI state is indicated by a second DCI, which is carried by a second PDCCH. The method according to any one of claims 1 to 5, characterized by the features described herein.

12. A method for determining the default beam applied to network-side devices, The process includes the step of transmitting a first DCI carried on a first PDCCH to a terminal device that performs the default beam determination method described in claim 1, Here, the first DCI is used by the terminal device to determine a transmit beam based on the first DCI, and in response to determining that a transmit beam cannot be determined based on the first DCI, to determine a default beam based on a plurality of TCI states corresponding to the second PDCCH. The default beam is applied to other uplink and / or downlink transmissions other than PDCCH. A method for determining the default beam, characterized by the following features.

13. A default beam determination device, A receiving module for receiving the first DCI carried on the first PDCCH, The system includes a decision module for determining a default beam based on a plurality of TCI states corresponding to a second PDCCH, in response to determining that the transmit beam cannot be determined based on the first DCI, The default beam is applied to other uplink and / or downlink transmissions other than PDCCH. Determining the default beam based on multiple TCI states corresponding to the second PDCCH is: Determining one or more default TCI states based on a plurality of TCI states corresponding to the second PDCCH, The process includes determining the default beam based on the one or more default TCI states, Determining one or more default TCI states based on a plurality of TCI states corresponding to the second PDCCH is: Determine the one or more default TCI states based on the IDs of a plurality of TCI states corresponding to the second PDCCH. Or, This includes obtaining the attribute value of the CORESET corresponding to the second PDCCH, and determining the one or more default TCI states based on the attribute value of the CORESET corresponding to the second PDCCH. A default beam determination device characterized by the following features.

14. A default beam determination device, The system includes a transmitting module for transmitting a first DCI carried on a first PDCCH to a terminal device that performs the default beam determination method described in claim 1, Here, the first DCI is used by the terminal device to determine a transmit beam based on the first DCI, and in response to determining that a transmit beam cannot be determined based on the first DCI, to determine a default beam based on a plurality of TCI states corresponding to the second PDCCH. The default beam is applied to other uplink and / or downlink transmissions other than PDCCH. A default beam determination device characterized by the following features.

15. A communication device comprising a transceiver, a memory, and a processor connected to the transceiver and the memory, respectively. The processor is configured to control the transmission and reception of wireless signals by the transceiver by executing computer-executable instructions in the memory, thereby realizing the default beam determination method described in any one of claims 1 to 11, or the default beam determination method described in claim 12. A communication device characterized by the following features.

16. A computer storage medium, wherein the computer storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the method for determining the default beam described in any one of claims 1 to 11, or the method for determining the default beam described in claim 12, can be realized. A computer storage medium characterized by the following features.

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