Data sending and receiving method, and device

Abstract

Embodiments of the present application provide a data sending and receiving method and a device. The method comprises: a terminal device receiving first signaling; upon receiving the first signaling, carrying out random access; when random access is contention-based random access, after random access is complete and before a first point in time, the terminal device receiving downlink information or sending uplink information according to a first TCI state indicated by the first signaling, and / or the terminal device receiving downlink information or sending uplink information according to a SSB selected by the terminal device during random access and / or first information sent by the terminal device during random access.

Description

Data sending and receiving method and device Technical Field

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

[0002] During the standardization of Release 18 (Rel-18), the 3GPP standardization organization conducted research on Layer 1 / Layer 2 Triggered Mobility (LTM). Rel-18 LTM includes RACH-less LTM and RACH-based LTM.

[0003] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of this application and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are explained in the background technology part of this application.

[0004] Summary of the Invention

[0005] Rel-18 studies Layer 1 / Layer 2 Triggered Mobility (LTM). For Rel-18 LTM, the goal is to reduce handover interruption through cell switching based on Layer 1 / Layer 2 signaling (Layer 1 / Layer 2 triggered), so as to switch from the serving cell (source cell) to the target cell faster. The target cell is the cell after switching, which can be a serving cell or a non-serving cell. Handover interruption refers to the time from the terminal device receiving the cell switch command to the first successful completion of uplink or downlink transmission between the terminal device and the target cell. Compared with the traditional cell switching based on Layer 3 signaling, the cell switching based on Layer 1 / Layer 2 signaling can further reduce handover interruption.

[0006] Rel-18 LTM includes RACH-less LTM and RACH-based LTM. For RACH-less LTM, the terminal device can perform non-contention-based random access with the candidate cell before the cell handover command (but the candidate cell does not send RAR), and the cell handover command indicates the target cell and indicates TA (Timing Advance) to the terminal device. For RACH-based LTM, the cell handover command indicates the target cell, and the terminal device performs contention-based or non-contention-based random access with the target cell after the cell handover command, and the terminal device obtains TA after the cell handover command.

[0007] However, the inventors found that for RACH-based LTM, after random access is completed and during the random access process, how the terminal device should receive downlink information or send uplink information, for example, how to determine the beam, QCL, or spatial filter for the received downlink information or the sent uplink information, is still a problem that needs to be solved.

[0008] To address at least one of the above problems, embodiments of the present application provide a method and apparatus for transmitting and receiving data.

[0009] According to one aspect of an embodiment of the present application, a data transceiver method is provided, which is applied to a terminal device, and the method includes:

[0010] receiving a first signaling, and performing random access after receiving the first signaling;

[0011] In the case where the random access is contention-based random access, after the random access is completed and before the first time point, downlink information is received or uplink information is sent according to the first TCI state indicated by the first signaling, and / or downlink information is received or uplink information is sent according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0012] According to another aspect of an embodiment of the present application, a data transceiver method is provided, which is applied to a network device, and the method includes:

[0013] Sending a first signaling to the terminal device,

[0014] Receive or send uplink information sent or downlink information received by the terminal device, wherein the terminal device performs random access after receiving the first signaling, and in the case where the random access is a contention-based random access, after the random access is completed and before the first time point, the terminal device receives downlink information or sends uplink information according to the first TCI state indicated by the first signaling, and / or the terminal device receives downlink information or sends uplink information according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0015] According to another aspect of an embodiment of the present application, a data transceiver device is provided, configured in a terminal device, wherein the data transceiver device includes:

[0016] A first transceiver unit receives a first signaling,

[0017] an execution unit, configured to perform random access after receiving the first signaling;

[0018] In the case where the random access is contention-based random access, after the random access is completed and before the first time point, the first transceiver unit receives downlink information or sends uplink information according to the first transmission configuration indication state (TCI state) indicated by the first signaling, and / or the first transceiver unit receives downlink information or sends uplink information according to the system synchronization block (SSB) selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0019] According to another aspect of an embodiment of the present application, a data transceiver device is provided, configured in a network device, the data transceiver device comprising:

[0020] The second transceiver unit sends the first signaling to the terminal device,

[0021] The second transceiver unit receives or sends uplink information sent or downlink information received by the terminal device, wherein the terminal device performs random access after receiving the first signaling, and in the case where the random access is a contention-based random access, after the random access is completed and before the first time point, the terminal device receives downlink information or sends uplink information according to the first transmission configuration indication state (TCI state) indicated by the first signaling, and / or the terminal device receives downlink information or sends uplink information according to the system synchronization block (SSB) selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0022] According to another aspect of an embodiment of the present application, a communication system is provided, including:

[0023] A network device that sends a first signaling, and

[0024] A terminal device that receives the first signaling and performs random access after receiving the first signaling; wherein, in the case where the random access is a contention-based random access, after the random access is completed and before a first time point, the terminal device receives downlink information or sends uplink information according to the first TCI state indicated by the first signaling, and / or the terminal device receives downlink information or sends uplink information according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0025] One of the beneficial effects of the embodiments of the present application is that: the terminal device receives a first signaling, and performs random access after receiving the first signaling; and in the case where the random access is a contention-based random access, after the random access is completed and before the first time point, the terminal device receives downlink information or sends uplink information according to the first TCI state indicated by the first signaling, and / or the terminal device receives downlink information or sends uplink information according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access. Thus, it is possible to avoid ambiguity when the terminal device determines which beam and beam-related parameters to use to receive downlink information or send uplink information within a certain period of time after the random access is completed, so that the uplink information or downlink information can be accurately and quickly sent and received between the terminal device and the network device, and the terminal device can always use the best beam to transmit information with the target cell, which is conducive to improving the reliability or throughput of the transmission.

[0026] With reference to the following description and accompanying drawings, specific embodiments of the present application are disclosed in detail, indicating the manner in which the principles of the present application can be employed. It should be understood that the embodiments of the present application are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present application include many variations, modifications and equivalents.

[0027] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0028] It should be emphasized that the term "include / comprising" when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The elements and features described in one figure or one embodiment of the present application can be combined with the elements and features shown in one or more other figures or embodiments. In addition, in the accompanying drawings, similar reference numerals represent corresponding parts in several figures and can be used to indicate corresponding parts used in more than one embodiment.

[0030] FIG1 is a schematic diagram of a communication system according to an embodiment of the present application;

[0031] FIG2 is a schematic diagram of a data sending and receiving method according to an embodiment of the present application;

[0032] FIG3 is an example diagram of a cell handover signaling process according to an embodiment of the present application;

[0033] FIG4 is another example diagram of the cell handover signaling process according to an embodiment of the present application;

[0034] FIG5A is an exemplary diagram of determining a beam in a first time period according to an embodiment of the present application;

[0035] FIG. 5B is another example diagram of determining a beam in the first time period according to an embodiment of the present application.

[0036] FIG6 is a schematic diagram of another data sending and receiving method according to an embodiment of the present application;

[0037] FIG7 is a schematic diagram of a data transceiver device according to an embodiment of the present application;

[0038] FIG8 is a schematic diagram of another data transceiver device according to an embodiment of the present application;

[0039] FIG9 is a schematic diagram of the structure of a network device according to an embodiment of the present application;

[0040] FIG10 is a schematic diagram of a terminal device according to an embodiment of the present application. DETAILED DESCRIPTION

[0041] The above and other features of the present application will become apparent through the following description with reference to the accompanying drawings. In the description and the accompanying drawings, specific embodiments of the present application are disclosed in detail, which illustrate some embodiments in which the principles of the present application can be adopted. It should be understood that the present application is not limited to the described embodiments. On the contrary, the present application includes all modifications, variations and equivalents that fall within the scope of the appended claims.

[0042] In the embodiments of the present application, the terms "first", "second", etc. are used to distinguish different elements from the name, but do not indicate the spatial arrangement or temporal order of these elements, and these elements should not be limited by these terms. The term "and / or" includes any one and all combinations of one or more of the associated listed terms. The terms "comprising", "including", "having", etc. refer to the presence of the stated features, elements, components or components, but do not exclude the presence or addition of one or more other features, elements, components or components.

[0043] In the embodiments of this application, the singular forms "a," "the," etc. include plural forms and should be broadly understood to mean "a" or "a type" rather than being limited to "one." Furthermore, the term "said" should be understood to include both singular and plural forms, unless the context clearly indicates otherwise. Furthermore, the term "according to" should be understood to mean "at least in part based on...", and the term "based on" should be understood to mean "at least in part based on...", unless the context clearly indicates otherwise.

[0044] In the embodiments of the present application, the term "communication network" or "wireless communication network" may refer to a network that complies with any of the following communication standards, such as Long Term Evolution (LTE), enhanced Long Term Evolution (LTE-A, LTE-Advanced), Wideband Code Division Multiple Access (WCDMA), High-Speed ​​Packet Access (HSPA), etc.

[0045] Furthermore, communication between devices in the communication system may be carried out according to communication protocols of any stage, for example, including but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and 5G, New Radio (NR), etc., and / or other communication protocols currently known or to be developed in the future.

[0046] In the embodiments of the present application, the term "network device" refers to, for example, a device in a communication system that connects a terminal device to the communication network and provides services to the terminal device. Network devices may include, but are not limited to, the following devices: base station (BS), access point (AP), transmission reception point (TRP), broadcast transmitter, mobile management entity (MME), gateway, server, radio network controller (RNC), base station controller (BSC), etc.

[0047] Base stations may include, but are not limited to, NodeB (NB), evolved NodeB (eNodeB or eNB), and 5G base stations (gNB), among others. They may also include remote radio heads (RRHs), remote radio units (RRUs), relays, or low-power nodes (e.g., femeto, pico, etc.). The term "base station" may include some or all of their functions, and each base station may provide communication coverage for a specific geographic area. The term "cell" may refer to a base station and / or its coverage area, depending on the context in which the term is used.

[0048] In the embodiments of the present application, the term "user equipment" (UE) or "terminal equipment" (TE) refers to, for example, a device that accesses a communication network through a network device and receives network services. A terminal device can be fixed or mobile and may also be referred to as a mobile station (MS), a terminal, a subscriber station (SS), an access terminal (AT), a station, and so on.

[0049] Among them, terminal devices may include but are not limited to the following devices: cellular phones, personal digital assistants (PDAs), wireless modems, wireless communication devices, handheld devices, machine-type communication devices, laptop computers, cordless phones, smart phones, smart watches, digital cameras, etc.

[0050] For another example, in scenarios such as the Internet of Things (IoT), the terminal device can also be a machine or device for monitoring or measurement, including but not limited to: machine type communication (MTC) terminal, vehicle-mounted communication terminal, device-to-device (D2D) terminal, machine-to-machine (M2M) terminal, and so on.

[0051] In addition, the term "network side" or "network device side" refers to one side of the network, which can be a base station or one or more network devices as described above. The term "user side" or "terminal side" or "terminal device side" refers to the user or terminal side, which can be a UE or one or more terminal devices as described above. Unless otherwise specified herein, "device" can refer to either network equipment or terminal equipment.

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

[0053] Figure 1 is a schematic diagram of a communication system according to an embodiment of the present application, which schematically illustrates a situation taking a terminal device and a network device as an example. As shown in Figure 1 , a communication system 100 may include a first network device 101, a second network device 102, and a terminal device 103. For simplicity, Figure 1 only illustrates two network devices and one terminal device as an example, but the embodiment of the present application is not limited to this.

[0054] For example, the first network device 101 is the serving cell (source cell) of the terminal device 103 , and the second network device 102 is the cell after switching (target cell) of the terminal device 103 .

[0055] To implement cell switching based on layer 1 / layer 2, the terminal device measures multiple candidate cells, for example, measuring the layer 1-reference signal receiving power (L1-RSRP) of the system synchronization block (SSB); and reports the measurement results to the source cell, for example, sending a channel state information report (CSI report). The source cell indicates to the terminal device which candidate cell to switch to through a cell switching command (the indicated candidate cell becomes the target cell); and indicates the beam used for uplink and downlink transmission in the target cell after switching, for example, the transmission configuration indication state (TCI state). The source cell, candidate cell, and target cell in Rel-18 LTM all support the Rel-17 unified TCI state (unified TCI). Therefore, the TCI state indicated above is the unified TCI state. For unified TCI, the high-level parameter "unifiedTCI-StateType" can configure whether to use a joint TCI state or a separate TCI state. When the value of the "unifiedTCI-StateType" parameter is 'joint', the TCI state is the joint TCI state; when the value of the "unifiedTCI-StateType" parameter is 'separate', the TCI state is the downlink TCI state and / or the uplink TCI state.

[0056] For example, for RACH-based LTM, after the first network device 101 sends a cell switching command to the terminal device 103, the terminal device 103 switches to the second network device 102; the terminal device 103 performs random access on the second network device 102, and after the random access is completed, sends and receives uplink information and downlink information with the second network device 102.

[0057] The inventors found that, for example, the cell switching command sent by the first network device 101 to the terminal device 103 can indicate beam-related parameters, for example, indicating the TCI state, and the terminal device 103 will select a system synchronization block (SSB) for measurement during the random access process, and the terminal device 103 may also send first information during the random access process, wherein the SSB selected by the terminal device 103 during the random access process or the beam associated with the first information sent during the random access process may be different from the beam indicated by the cell switching command.

[0058] Therefore, for RACH-based LTM, how the terminal device should receive downlink information or send uplink information after random access is completed and during the random access process, for example, how to determine the beam, QCL, or spatial filter for the received downlink information or sent uplink information, etc., remains a problem that needs to be solved.

[0059] To address at least one of the above problems, embodiments of the present application provide a method and apparatus for transmitting and receiving data.

[0060] Embodiments of the first aspect

[0061] An embodiment of the present application provides a data sending and receiving method, which is applied on the terminal device side.

[0062] FIG2 is a schematic diagram of a data transmission and reception method according to an embodiment of the present application. As shown in FIG2 , the method includes:

[0063] 201, the terminal device receives a first signaling;

[0064] 202. The terminal device performs random access after receiving the first signaling;

[0065] 203. In the case where the random access is a contention-based random access, after the random access is completed and before the first time point, downlink information is received or uplink information is sent according to the first TCI state indicated by the first signaling, and / or downlink information is received or uplink information is sent according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0066] In this way, ambiguity caused by the terminal device determining which beam to use and beam-related parameters to receive downlink information or send uplink information within a certain period of time after the random access is completed can be avoided, so that uplink information or downlink information can be sent and received accurately and quickly between the terminal device and the network device, and the terminal device can always use the best beam to transmit information with the target cell, which is conducive to improving the reliability or throughput of the transmission.

[0067] It is worth noting that FIG2 above is merely a schematic illustration of an embodiment of the present application, using a terminal device as an example, but the present application is not limited thereto. For example, the execution order of the various operations may be appropriately adjusted, other operations may be added or some operations may be reduced, and the objects of the aforementioned operations may be adjusted. Those skilled in the art may make appropriate modifications based on the above description, and are not limited to the description of FIG2 above.

[0068] In some embodiments, random access includes contention-based random access (CBRA) and contention-free random access (CFRA); random access may be Type-1 random access (4-step random access) or Type-2 random access (2-step random access); "random access" may be replaced by "random access procedure", or "initial access procedure", or "initial random access procedure", etc.

[0069] For example, the random access process can refer to the existing standards. For example, the terminal device receives a contention-resolved physical downlink shared channel (PDSCH), or the terminal device sends an ACK for the contention-resolved physical downlink shared channel (PDSCH), or the terminal device receives MsgB, or the terminal device sends an ACK for MsgB, and the random access process is considered to be completed. For example, the start of the random access process can be triggered by a MAC entity (MAC entity), RRC, or PDCCH order, and this application does not limit or list them one by one.

[0070] In some implementations, the downlink information or uplink information in “receiving downlink information or sending uplink information” in step 203 is downlink information or uplink information after random access is completed.

[0071] For example, the above-mentioned downlink information can be at least one of a physical downlink control channel (PDCCH), a demodulation reference signal (DM-RS) of PDCCH, PDSCH, DM-RS of PDSCH, or a channel state information reference signal (CSI-RS) following unified TCI. This application does not limit or list them one by one; the uplink information can be at least one of a dynamic grant Physical Uplink Shared Channel (dynamic grant PUSCH), a dynamic grant PUSCH DM-RS, a configured grant PUSCH, a configured grant PUSCH DM-RS, PUCCH, or an uplink sounding reference signal (SRS) following unified TCI. This application does not limit or list them one by one.

[0072] In some embodiments, the first information sent by the terminal device includes at least one of the following: a physical uplink shared channel (PUSCH) scheduled by a random access response (RAR) uplink grant (UL grant); a preamble; a message A physical uplink shared channel (MsgA PUSCH); or a physical uplink shared channel (PUSCH) scheduled by a fallback random access response (fallback RAR) uplink grant (UL grant).

[0073] For example, for Type-1 random access (4-step random access), the first information may be "physical uplink shared channel (PUSCH) scheduled by random access response (RAR) uplink grant (UL grant)", or "preamble"; for Type-2 random access (2-step random access), the first information may be "preamble", or "message A physical uplink shared channel (MsgA PUSCH)", or "physical uplink shared channel (PUSCH) scheduled by fallback random access response (fallback RAR) uplink grant (UL grant)"; the first information may also be other information, which is not limited or listed one by one in this application.

[0074] In some embodiments, "according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access" can be replaced by "according to the SSB selected by the terminal device in the most recent random access and / or the first information sent by the terminal device in the most recent random access".

[0075] In some embodiments, "before the first time point" can be replaced by "until the first time point", and the later "quasi co-location (QCL)" can be replaced by "QCL assumption", etc. This application does not limit this.

[0076] In some implementations, "PUSCH" corresponds to (is equivalent to) "uplink data" corresponds to (is equivalent to) "UL-SCH", etc., and this application does not limit this.

[0077] In some embodiments, the terms "corresponding", "associated", and "including" may be interchangeable; the terms "PUSCH", "PUSCH transmission", and "PUSCH sending" may be interchangeable, and this application does not limit this.

[0078] In some implementations, the first signaling is a cell handover command, wherein the cell handover command is carried by MAC CE signaling.

[0079] For example, the specific signaling format of the MAC CE of the cell switching command can be referred to in the prior art, and this application does not limit this.

[0080] In some implementations, the cell handover command indicates a first TCI state, where the first TCI state includes a combined TCI state, or the first TCI state includes a downlink TCI state and an uplink TCI state.

[0081] For example, the high-level parameter "unifiedTCI-StateType" is used to configure whether the target cell uses a joint TCI state or a separate TCI state (downlink TCI state and / or uplink TCI state). For example, the high-level parameter "unifiedTCI-StateType" is carried through Radio Resource Control (RRC) signaling; for example, when the value of the unifiedTCI-StateType parameter is 'joint', the first TCI state includes a joint TCI state; when the value of the unifiedTCI-StateType parameter is 'separate', the first TCI state includes a downlink TCI state and an uplink TCI state (i.e., a pair of TCI states).

[0082] For example, when the unifiedTCI-StateType parameter value is 'joint' and the random access is contention-based random access, after the random access is completed and before the first time point, the terminal device receives downlink information or sends uplink information according to a joint TCI state indicated by the cell switching command; for example, when the unifiedTCI-StateType parameter value is 'separate' and the random access is contention-based random access, after the random access is completed and before the first time point, the terminal device receives downlink information according to a downlink TCI state indicated by the cell switching command, and sends uplink information according to an uplink TCI state indicated by the cell switching command.

[0083] In some embodiments, when the random access is contention-based random access, during the random access process, the terminal device selects an SSB, determines a PRACH occasion based on the selected SSB, and sends PRACH on the determined PRACH occasion (or "sends a preamble", or "sends Msg1").

[0084] For example, in the case where the random access is contention-based random access, after the random access is completed and before the first time point, the terminal device determines the beam for receiving downlink information or sending uplink information based on the beam corresponding to the selected SSB.

[0085] In some embodiments, when the random access is contention-based random access, the terminal device sends first information during the random access process.

[0086] For example, the first information is a PUSCH scheduled by an RAR UL grant. In the case where the random access is a contention-based random access, after the random access is completed and before the first time point, the terminal device determines the beam for receiving downlink information or sending uplink information based on the beam corresponding to the PUSCH (Msg.3 in Type-1 random access) scheduled by the RAR UL grant (Msg.2 in Type-1 random access).

[0087] For example, the first information is a preamble or Msg1 or MsgA PUSCH or MsgA or PUSCH scheduled by a fallback RAR UL grant. In the case where the random access is a contention-based random access, after the random access is completed and before the first time point, for Type-1 random access or Type-2 random access, the terminal device determines the beam for receiving downlink information or sending uplink information based on the beam corresponding to the preamble or Msg1 or MsgA PUSCH or MsgA or PUSCH scheduled by a fallback RAR UL grant.

[0088] The circumstances under which "the terminal device receives downlink information or sends uplink information according to the first TCI state indicated by the first signaling" and the circumstances under which "the terminal device receives downlink information or sends uplink information according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access" will be described in detail in the subsequent content.

[0089] The following is an example of the data sending and receiving method of this application using the specific example of the "first time point":

[0090] FIG3 is an example diagram of a cell switching signaling process according to an embodiment of the present application.

[0091] For example, as shown in Figure 3, in the case where the random access is contention-based random access, after the random access process (after the random access is completed) and before the first time point (i.e., within the first time period in Figure 3), the terminal device receives downlink information or sends uplink information according to the first TCI state indicated by the cell switching command, or receives downlink information or sends uplink information according to the first information sent by the terminal device during the random access process.

[0092] For example, the aforementioned “receiving downlink information or sending uplink information according to…” includes “determining the beam of the received downlink information or the sent uplink information according to…”; “determining the beam” can also be replaced by “determining the spatial relation” and so on.

[0093] For example, the cell handover command indicates a first TCI state, where the first TCI state may include a joint TCI state, i.e., the unifiedTCI-StateType of the target cell is 'joint', or the first TCI state may include a downlink TCI state and an uplink TCI state (i.e., a pair of TCI states), i.e., the unifiedTCI-StateType of the target cell is 'separate'. For example, the first TCI state may be used to determine a beam.

[0094] For example, during the random access process, the terminal device selects an SSB, determines a PRACH occasion based on the selected SSB, and sends PRACH on the PRACH occasion. The SSB can be used to determine the beam. For example, the "first information" can be a PUSCH scheduled by a RAR UL grant, that is, Msg3 in the Type I random access process. The Msg3 can be used to determine the beam, and the RAR UL grant (applied to Type-1 random access) can also be replaced by a fallbackRAR UL grant (applied to Type-2 random access); for example, the "first information" can also be MsgA PUSCH (applied to Type-2 random access), or a preamble (applied to Type-1 random access or Type-2 random access), etc. This application does not list them one by one.

[0095] In this way, ambiguity caused by the terminal device determining which beam to use and beam-related parameters to receive downlink information or send uplink information within a certain period of time after random access is completed can be avoided.

[0096] In some embodiments, the method further includes: receiving second signaling after the random access is completed, wherein the second signaling indicates or does not indicate a second TCI state, wherein the first time point is the time point when the terminal device applies the second TCI state, or the first time point is the time point when the terminal device receives the second signaling.

[0097] In some embodiments, the second signaling is at least one of the following: Medium Access Control, Control Element, MAC CE) signaling, downlink control information (DCI) signaling, or Radio Resource Control (RRC) signaling.

[0098] FIG4 is another example diagram of the cell switching signaling process according to an embodiment of the present application.

[0099] For example, after the random access process, the terminal device receives second signaling indicating a second TCI state from the target cell, thereby using the second TCI state to receive downlink information or send uplink information in the target cell after the first time point. For example, the second TCI state is different from the first TCI state, that is, the second TCI state is a new TCI state, or the second TCI state can be the same as the first TCI state.

[0100] For example, the "time point" in this application can be a time slot or a symbol, etc., and this application does not limit this.

[0101] For example, the first time point may be the time point at which the terminal device applies the second TCI state, or the time point at which the second signaling is received, as schematically illustrated in FIG4 .

[0102] For example, the first time point may be the time point at which the terminal device applies the second TCI state:

[0103] Taking the second signaling as DCI signaling as an example, as shown in Figure 4, after the random access process, the terminal device receives a MAC CE, which activates multiple (groups) of TCI states; then the terminal device receives a second signaling, such as DCI signaling, which indicates the second TCI state among the activated multiple (groups) of TCI states; the terminal device sends an ACK for the DCI (or the PDSCH scheduled by the DCI), and then starts applying the second TCI state in the first time slot after the beam application time (beam application time, beamAppTime), so that the first time point is the time point when the terminal device starts applying the second TCI state, for example, the first time point is T1 shown in Figure 4.

[0104] For example, the first time point may also be the time point at which the terminal device receives the second signaling:

[0105] For example, still taking FIG. 4 as an example, the first time point is the time point when the terminal device receives the DCI, such as T2 shown in FIG. 4 .

[0106] In some embodiments, the second TCI state includes at least one of the following: a combined TCI state; a downlink TCI state and an uplink TCI state; a downlink TCI state; or an uplink TCI state.

[0107] For example, when the unifiedTCI-StateType of the target cell is 'joint', the second TCI state may include a joint TCI state; when the unifiedTCI-StateType of the target cell is 'separate', the second TCI state may include a downlink TCI state, or may include an uplink TCI state, or may include a downlink TCI state and an uplink TCI state (i.e., a pair of TCI states).

[0108] For example, when the unifiedTCI-StateType of the target cell is 'joint', the second TCI state can only include one joint TCI state; when the unifiedTCI-StateType of the target cell is 'separate', the second TCI state can only include one downlink TCI state and one uplink TCI state (i.e., a pair of TCI states).

[0109] For example, when the unifiedTCI-StateType of the target cell is 'joint', the MAC CE in FIG4 indicates a set of TCI states, for example, including 8 joint TCI states, and the DCI in FIG4 indicates one TCI state among the 8 joint TCI states as the second TCI state; when the unifiedTCI-StateType of the target cell is 'separate', the MAC CE in FIG4 indicates a set of TCI states, for example, including "8 downlink TCI states and 8 uplink TCI states (i.e., 8 pairs of TCI states)", and the DCI in FIG4 indicates "one downlink TCI state and one uplink TCI state" (i.e., a pair of TCI states) among the "8 downlink TCI states and 8 uplink TCI states" as the second TCI state. Alternatively, when the unifiedTCI-StateType of the target cell is 'separate', the MAC CE in FIG4 indicates a set of TCI states, including "7 downlink TCI states and 7 uplink TCI states (i.e., 7 pairs of TCI states), and a single downlink TCI state", the DCI in Figure 4 indicates "single downlink TCI state" in "7 downlink TCI states and 7 uplink TCI states, and a single downlink TCI state", and the terminal device uses the indicated "single downlink TCI state" as the second TCI state, and the existing "one uplink TCI state" does not change.

[0110] Thus, the terminal device can determine the second TCI state and the corresponding first time point.

[0111] In some implementations, after the first time point, the terminal device applies a second TCI state to receive downlink information or send uplink information.

[0112] In the above examples, for example, the second signaling in Figure 4 is DCI. Optionally, the second signaling can also be MAC CE signaling or RRC signaling. For example, the MAC CE as the second signaling only activates a second TCI state, or the RRC signaling as the second signaling configures a TCI state list that only includes the second TCI state (can also be replaced by "RRC signaling as the second signaling configures a TCI state pool that only includes the second TCI state"). Accordingly, the first time point is the time point when the terminal device applies the second TCI state, or the time point when the MAC CE signaling or RRC signaling as the second signaling is received.

[0113] In some implementations, the receiving downlink information or sending uplink information at least includes: determining a QCL or a spatial filter for the downlink information or the uplink information.

[0114] For example, "receiving downlink information or sending uplink information" includes "determining a beam or spatial relationship for receiving downlink information or sending uplink information", and more specifically, includes "determining a QCL or spatial filter for receiving downlink information or sending uplink information".

[0115] For example, for downlink information (received information), the terminal device determines the QCL hypothesis or spatial domain filter for the downlink information based on the joint TCI state or the downlink TCI state in the first TCI state, or determines the QCL hypothesis or spatial domain filter for the downlink information based on the SSB selected by the terminal device in random access.

[0116] For example, for uplink information (transmitted information), the terminal device determines the spatial domain filter for the uplink information based on the combined TCI state or the uplink TCI state in the first TCI state, or determines the spatial domain filter for the uplink information based on the SSB selected by the terminal device in the random access, or determines the spatial domain filter for the uplink information based on the first information sent by the terminal device in the random access.

[0117] For example, how the terminal device determines the QCL hypothesis or spatial domain filter for downlink information, and how to determine the spatial domain filter for uplink information can refer to the existing technology. For example, the terminal device assumes that the downlink information and the reference information are quasi-co-located, or the terminal device assumes that the spatial domain filter for receiving the downlink information is the same as the spatial domain filter for receiving the reference information, or the terminal device assumes that the spatial domain filter for sending the uplink information is the same as the spatial domain filter for receiving the reference information (there is reciprocity), or the terminal device assumes that the spatial domain filter for sending the uplink information is the same as the spatial domain filter for sending the reference information.

[0118] For example, the reference information may be a source reference signal associated with the TCI state indicated by the cell switching command, or an SSB selected by the terminal device in random access, or the first information sent by the terminal device in random access; the downlink information may be at least one of a physical downlink control channel (PDCCH), a demodulation reference signal (DM-RS) of PDCCH, PDSCH, DM-RS of PDSCH, or a channel state information reference signal (CSI-RS) following unified TCI; the uplink information may be at least one of a dynamic grant Physical Uplink Shared Channel (dynamic grant PUSCH), DM-RS of dynamic grant PUSCH, configured grant PUSCH, DM-RS of configured grant PUSCH, PUCCH, or an uplink sounding reference signal (SRS) following unified TCI, etc., and this application does not impose any restrictions on this.

[0119] In this way, the beam-related parameters of the downlink information received or the uplink information sent by the terminal device can be determined.

[0120] The following describes in detail the specific implementation of “the terminal device receives downlink information or sends uplink information according to the first TCI state indicated by the first signaling” and “the terminal device receives downlink information or sends uplink information according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access”:

[0121] In some embodiments, when the random access is a contention-based random access, after the random access is completed and before a first time point, when a first condition is met, downlink information is received or uplink information is sent according to the first TCI state indicated by the first signaling, and / or, when a second condition is met, downlink information is received or uplink information is sent according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0122] For example, still taking Figure 3 as an example, in the case where the random access is contention-based random access, within the first time period in Figure 3, the terminal device determines to receive downlink information or send uplink information according to the first TCI state indicated by the cell switching command based on the first condition and / or the second condition, or receives downlink information or sends uplink information according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0123] For example, when the first condition is met, the terminal device receives downlink information or sends uplink information according to the first TCI state indicated by the cell switching command; when the second condition is met, the terminal device receives downlink information or sends uplink information according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0124] In some embodiments, the first condition includes at least one of the following: the SSB selected by the terminal device in the random access is the same as the SSB associated with the first TCI state indicated by the first signaling; or, the first TCI state indicated by the first signaling includes a downlink TCI state and an uplink TCI state.

[0125] In some embodiments, the second condition includes at least: the SSB selected by the terminal device in the random access is different from the SSB associated with the first TCI state indicated by the first signaling.

[0126] The following examples illustrate “the first condition that the SSB selected by the terminal device in the random access is the same as the SSB associated with the first TCI state indicated by the first signaling” and “the second condition that the SSB selected by the terminal device in the random access is different from the SSB associated with the first TCI state indicated by the first signaling”:

[0127] For example, when the SSB selected by the terminal device in the random access is the same as the SSB associated with the first TCI state indicated by the cell switching command, the first condition is met. When the first condition is met, the beam of the SSB autonomously selected by the terminal device in the random access (SSB beam) has not changed compared to the beam of the SSB associated with the first TCI state indicated by the previous cell switching command. For example, the SSB beam is usually a wide beam, and the satisfaction of the first condition indicates that the general direction of the beam in the random access process has not changed, and since the beam indicated by the cell switching command may also be a TRS beam, the TRS beam is a narrower and more precise beam than the SSB beam. For example, for a TCI state indicated by the cell switching command, its source reference signal can be SSB (TCI state directly associated with SSB) or TRS (TCI state directly associated with TRS). When the source reference signal of the TCI state is TRS, the source reference signal of the TRS can be SSB (TCI state indirectly associated with SSB). In other words, a TCI state is always directly or indirectly associated with an SSB. Therefore, by comparing the SSB associated with the TCI state indicated by the cell handover command with the SSB selected by the terminal device during random access, it is possible to determine whether the SSB beam direction has changed due to the terminal device's continued movement after handover to the target cell. When the SSB beam direction has not changed, the terminal device can use the beam indicated by the cell handover command, thereby benefiting from the potential reliability or throughput improvement brought by the TRS narrow beam.

[0128] Therefore, by enabling the terminal device to use the tracking reference signal (TRS) beam indicated by the cell switching command, it is more conducive to improving the reliability or throughput of data transmission between the terminal device and the target cell.

[0129] For example, when the SSB selected by the terminal device in random access is different from the SSB associated with the first TCI state indicated by the cell switching command, the second condition is met. When the second condition is met, the beam of the SSB autonomously selected by the terminal device in random access (SSB beam) has changed significantly compared to the beam of the SSB associated with the first TCI state indicated by the previous cell switching command, that is, the general direction of the beam has changed significantly, and the beam indicated by the previous cell switching command is no longer applicable, and the terminal device has found a better beam. Therefore, the terminal device uses the beam determined according to the SSB selected by the terminal device in random access and / or the first information sent by the terminal device in random access, that is, uses the latest determined beam.

[0130] This allows for more timely tracking of beam changes, ensuring that a better beam is always used for data transmission with the target cell.

[0131] FIG5A is an example diagram of determining a beam in a first time period according to an embodiment of the present application; FIG5B is another example diagram of determining a beam in a first time period according to an embodiment of the present application.

[0132] For example, as shown in Figure 5A, the SSB beam (SSB1 beam) determined by the terminal device in random access is the same as the SSB beam (SSB1 beam) associated with the TCI state indicated by the cell switching command, so the terminal device uses the first TCI state indicated by the cell switching command in the first time period. The first TCI state indicated by the cell switching command shown in Figure 5A is directly associated with the TRS, so the terminal device uses the TRS beam in the first time period. If the TCI state indicated by the cell switching command is directly associated with the SSB1 beam (not shown in Figure 5A), the terminal device will use the SSB1 beam in the first time period, that is, the same as the SSB beam (SSB1 beam) determined by the terminal device in random access.

[0133] For example, as shown in Figure 5B, the SSB beam (SSB2 beam) determined by the terminal device in random access is different from the SSB beam (SSB1 beam) associated with the TCI state indicated by the cell switching command. Therefore, the beam corresponding to the first TCI state indicated by the cell switching command is no longer applicable. The terminal device finds a more suitable beam in random access. Therefore, the terminal device uses the SSB beam (SSB2 beam) determined in the random access within the first time period, that is, uses the latest beam.

[0134] The following examples illustrate “the first condition that the first TCI state indicated by the first signaling includes a downlink TCI state and an uplink TCI state and / or the SSB selected by the terminal device in the random access is the same as the SSB associated with the first TCI state indicated by the first signaling”, and “the second condition that the SSB selected by the terminal device in the random access is different from the SSB associated with the first TCI state indicated by the first signaling”:

[0135] For example, when the unifiedTCI-StateType of the target cell is 'separate', the first TCI state indicated by the first signaling includes a downlink TCI state and an uplink TCI state (i.e., a pair of TCI states), and the first condition is met. Therefore, the terminal device always receives downlink information or sends uplink information according to the first TCI state indicated by the cell switching command.

[0136] For example, when the unifiedTCI-StateType of the target cell is 'joint', and the SSB selected by the terminal device in the random access is the same as the SSB associated with the first TCI state indicated by the cell switching command, the first condition is met, so that the terminal device receives downlink information or sends uplink information according to the first TCI state indicated by the cell switching command. In other words, when the beam does not change significantly, a finer beam indicated by the cell switching command is used. Therefore, by enabling the terminal device to use the tracking reference signal (TRS) beam indicated by the cell switching command, it is more conducive to improving the reliability or throughput of data transmission between the target cell.

[0137] For example, when the unifiedTCI-StateType of the target cell is 'joint', and the SSB selected by the terminal device in the random access is different from the SSB associated with the first TCI state indicated by the cell switching command, the second condition is met, so that the terminal device receives downlink information or sends uplink information according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access. In other words, when the beam changes significantly, the most recently determined beam of the terminal device is used. In this way, the changes in the beam can be tracked more timely, ensuring that a better beam is always used for data transmission with the target cell.

[0138] In some embodiments, the SSB selected by the terminal device in the random access is the same as the SSB associated with the first TCI state indicated by the first signaling, including at least one of the following:

[0139] The SSB selected by the terminal device in the random access is the same as the SSB associated with the joint TCI state in the first TCI state indicated by the first signaling;

[0140] The SSB selected by the terminal device in the random access is the same as the SSB associated with the downlink TCI state in the first TCI state indicated by the first signaling, and the SSB selected by the terminal device in the random access is the same as the SSB associated with the uplink TCI state in the first TCI state indicated by the first signaling;

[0141] The SSB selected by the terminal device in the random access is the same as the SSB associated with the downlink TCI state in the first TCI state indicated by the first signaling, and the SSB selected by the terminal device in the random access is different from the SSB associated with the uplink TCI state in the first TCI state indicated by the first signaling; or

[0142] The SSB selected by the terminal device in the random access is different from the SSB associated with the downlink TCI state in the first TCI state indicated by the first signaling, and the SSB selected by the terminal device in the random access is the same as the SSB associated with the uplink TCI state in the first TCI state indicated by the first signaling.

[0143] In some embodiments, the SSB selected by the terminal device in the random access is different from the SSB associated with the first TCI state indicated by the first signaling, including at least one of the following:

[0144] The SSB selected by the terminal device in the random access is different from the SSB associated with the joint TCI state in the first TCI state indicated by the first signaling;

[0145] The SSB selected by the terminal device in the random access is different from the SSB associated with the downlink TCI state in the first TCI state indicated by the first signaling, and the SSB selected by the terminal device in the random access is different from the SSB associated with the uplink TCI state in the first TCI state indicated by the first signaling;

[0146] The SSB selected by the terminal device in the random access is the same as the SSB associated with the downlink TCI state in the first TCI state indicated by the first signaling, and the SSB selected by the terminal device in the random access is different from the SSB associated with the uplink TCI state in the first TCI state indicated by the first signaling; or

[0147] The SSB selected by the terminal device in the random access is different from the SSB associated with the downlink TCI state in the first TCI state indicated by the first signaling, and the SSB selected by the terminal device in the random access is the same as the SSB associated with the uplink TCI state in the first TCI state indicated by the first signaling.

[0148] For example, when the unifiedTCI-StateType of the target cell is 'joint', the first TCI state indicated by the cell handover command includes a joint TCI state. Table 1 shows the relationship between the SSB associated with the joint TCI state and the SSB selected by the terminal device in random access, which are marked as cases A and B respectively.

[0149] Table 1

[0150] For example, "the SSB selected by the terminal device in random access is the same as the SSB associated with the first TCI state indicated by the cell switching command" includes case A, and "the SSB selected by the terminal device in random access is different from the SSB associated with the first TCI state indicated by the cell switching command" includes case B.

[0151] For example, for case A, the first condition is met, and the terminal device uses the first TCI state indicated by the cell switching command within the first time period; for example, for case B, the second condition is met, and the terminal device receives downlink information or sends uplink information according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0152] For example, when the unifiedTCI-StateType of the target cell is 'separate', the first TCI state indicated by the cell switching command includes a downlink TCI state and an uplink TCI state (i.e., a pair of TCI states). Table 2 shows the relationship between the SSB associated with the downlink TCI state and the uplink TCI state and the SSB selected by the terminal device in random access, and the different relationship combinations are marked as Case 1 to Case 4.

[0153] Table 2

[0154] For example, "the SSB selected by the terminal device in random access is the same as the SSB associated with the first TCI state indicated by the cell switching command" includes case 1, case 2, and case 3, and "the SSB selected by the terminal device in random access is different from the SSB associated with the first TCI state indicated by the cell switching command" includes case 4.

[0155] For example, for case 1, case 2, and case 3, the first condition is met, and the terminal device uses the first TCI state indicated by the cell switching command within the first time period; for example, for case 4, the second condition is met, and the terminal device receives downlink information or sends uplink information based on the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0156] For example, "the SSB selected by the terminal device in random access is the same as the SSB associated with the first TCI state indicated by the cell switching command" includes case 1 and case 2, and "the SSB selected by the terminal device in random access is different from the SSB associated with the first TCI state indicated by the cell switching command" includes case 3 and case 4.

[0157] For example, for case 1 and case 2, the first condition is met, and the terminal device uses the first TCI state indicated by the cell switching command within the first time period; for example, for case 3 and case 4, the second condition is met, and the terminal device receives downlink information or sends uplink information according to the SSB selected by the terminal device in random access and / or the first information sent by the terminal device.

[0158] For example, "the SSB selected by the terminal device in random access is the same as the SSB associated with the first TCI state indicated by the cell switching command" includes case 1 and case 3, and "the SSB selected by the terminal device in random access is different from the SSB associated with the first TCI state indicated by the cell switching command" includes case 2 and case 4.

[0159] For example, for case 1 and case 3, the first condition is met, and the terminal device uses the first TCI state indicated by the cell switching command within the first time period; for example, for case 2 and case 4, the second condition is met, and the terminal device receives downlink information or sends uplink information according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0160] For example, "the SSB selected by the terminal device in random access is the same as the SSB associated with the first TCI state indicated by the cell switching command" includes case 1, and "the SSB selected by the terminal device in random access is different from the SSB associated with the first TCI state indicated by the cell switching command" includes case 2, case 3, and case 4.

[0161] For example, for case 1, the first condition is met, and the terminal device uses the first TCI state indicated by the cell switching command within the first time period; for example, for case 2, case 3, and case 4, the second condition is met, and the terminal device receives downlink information or sends uplink information based on the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0162] Therefore, for each of the above situations, it is possible to accurately determine whether the terminal device receives downlink information or sends uplink information based on the first TCI state indicated by the cell switching command using the cell switching command within the first time period, or whether the terminal device receives downlink information or sends uplink information based on the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0163] In some embodiments, the method further includes: when the random access is contention-based random access, after the random access is completed and before the first time point, and when the first TCI state indicated by the first signaling includes a downlink TCI state and an uplink TCI state, sending uplink information according to the uplink TCI state in the first TCI state indicated by the first signaling; and

[0164] When the first condition is met, downlink information is received according to the downlink TCI state in the first TCI state indicated by the first signaling, and / or, when the second condition is met, downlink information is received according to the SSB selected by the terminal device in the random access.

[0165] For example, when the unifiedTCI-StateType of the target cell is 'separate', for the transmission of uplink information, the terminal device always sends the uplink information according to the uplink TCI state in the first TCI state indicated by the cell switching command. For the reception of downlink information, the terminal device determines how to receive the downlink information based on the conditions. For example, when the first condition is met, the terminal device receives the downlink information according to the downlink TCI state in the first TCI state indicated by the cell switching command. When the second condition is met, the terminal device receives the downlink information according to the SSB selected by the terminal device in the random access.

[0166] For example, the “first condition” and the “second condition” can be referred to in the aforementioned embodiment and will not be repeated here.

[0167] In this way, beam-related parameters can be determined separately for the sending of uplink information and the receiving of downlink information, so that changes in the beam can be tracked more timely and accurately, ensuring that a better beam is always used for uplink and downlink data transmission with the target cell.

[0168] In some embodiments, the method further includes: when receiving downlink information or sending uplink information based on the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access, not retaining the first TCI state indicated by the first signaling.

[0169] For example, "not retain" can be replaced by "deactivate", or "release", or "invalid", or "ignore", etc., and this application does not limit this.

[0170] For example, the terminal device receives downlink information or sends uplink information based on the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access, rather than receiving downlink information or sending uplink information based on the first TCI state indicated by the cell switching command. Therefore, the terminal device does not retain the first TCI state indicated by the cell switching command. When the terminal device receives signaling indicating the second TCI state from the target cell, it considers that the second TCI state is the TCI state indicated by the target cell for the first time. In other words, the second TCI state is considered to be the TCI state received by the terminal device for the first time after accessing a new cell through the initial random access process. More specifically, for unified TCI, the terminal device needs to retain the indicated TCI state (indicated TCI state), and the indicated TCI state will only be applied when the indicated TCI state is different from the previously retained indicated TCI state. Since the terminal device does not retain the first TCI state, when the second TCI state is indicated, the second TCI state will always be applied, that is, the second TCI state is always considered to be a TCI state different from the previous one.

[0171] In this way, the UE behavior can be clarified so that the terminal device will not be confused about the TCI state used after the first time point, thereby ensuring accurate uplink and downlink data transmission between the terminal device and the target cell.

[0172] In some embodiments, the method further includes: when the random access is contention-based random access, selecting an SSB in the random access, and receiving downlink information or sending uplink information according to the selected SSB.

[0173] For example, as shown in Figure 3, during the random access process, that is, in the second time period shown in Figure 3, the terminal device selects an SSB and receives downlink information or sends uplink information according to the beam corresponding to the SSB, for example, determines the beam for receiving downlink information or sending uplink information.

[0174] In some implementations, the downlink information or uplink information in the aforementioned “receiving downlink information or sending uplink information” is downlink information or uplink information in random access.

[0175] For example, for a contention-based random access process, the above-mentioned downlink information or uplink information includes at least one of PRACH (Msg1), Msg2, Msg3, contention resolution PDSCH, PDCCH for scheduling contention resolution PDSCH, MsgA, MsgB, and ACK / NACK, and the present application does not limit or list them one by one; for a non-contention-based random access process, the above-mentioned downlink information or uplink information includes at least one of PRACH (Msg1), Msg2, MsgA, MsgB, and ACK / NACK, and the present application does not limit or list them one by one; for example, the above-mentioned Msg2 can also be replaced by a RAR message including PDCCH and PDSCH (RAR message with PDCCH / PDSCH); the above-mentioned ACK / NACK is the ACK / NACK sent by the terminal device during the random access process; PRACH is equivalent to preamble; MsgA includes preamble and MsgA PUSCH, etc., and the present application does not limit them.

[0176] In some embodiments, receiving downlink information or sending uplink information based on the selected SSB at least includes: determining a PRACH occasion, and / or determining a QCL or a spatial filter for the downlink information or the uplink information.

[0177] For example, during the random access process, the terminal device determines the PRACH occasion based on the selected SSB, and determines the QCL or spatial filter for receiving downlink information or sending uplink information. For example, the terminal device assumes that the DM-RS of Msg2, the DM-RS of the contention resolution PDSCH, or the DM-RS of the PDCCH for scheduling contention resolution PDSCH is quasi-co-located with the SSB selected in the random access, etc., and this application does not limit this.

[0178] In this way, the beam-related parameters of the downlink information received or the uplink information sent by the terminal device can be determined.

[0179] In some embodiments, when the random access is non-contention-based random access, after the random access is completed and before the first time point, downlink information is received or uplink information is sent according to the first TCI state indicated by the first signaling.

[0180] For example, as shown in Figure 3, in the case where the random access is based on non-contention random access, the terminal device receives downlink information or sends uplink information according to the first TCI state indicated by the cell switching command within the first time period, for example, determines a beam for the received downlink information or the sent uplink information.

[0181] In some implementations, when the random access is a non-contention-based random access, in the random access, downlink information is received or uplink information is sent according to a reference signal indicated by the first signaling.

[0182] For example, as shown in FIG3 , in the case where the random access is non-contention-based random access, the terminal device receives downlink information or sends uplink information according to the reference signal indicated by the cell handover command within the first time period. For example, the received downlink information or the sent uplink information includes at least one of PRACH (Msg1), Msg2, MsgA, MsgB, and ACK / NACK, and this application is not limited to this.

[0183] In some embodiments, the reference signal indicated by the first signaling includes at least one of the following: an SSB indicated by the first signaling, a CSI-RS indicated by the first signaling, an SSB associated with the first TCI state indicated by the first signaling, or a CSI-RS associated with the first TCI state indicated by the first signaling.

[0184] For example, the reference signal indicated in the cell handover command may be at least one of the following:

[0185] an SSB indicated by a cell handover command, wherein a field in the cell handover command indicates the SSB;

[0186] a CSI-RS indicated by a cell handover command, wherein a field in the cell handover command indicates the CSI-RS;

[0187] An SSB associated with a first TCI state, wherein the cell handover command indicates the first TCI state, and the first TCI state is associated with the SSB;

[0188] A CSI-RS associated with a first TCI state, wherein the cell handover command indicates the first TCI state, and the first TCI state is associated with a CSI-RS. For example, the CSI-RS may also be a TRS.

[0189] For example, when the unifiedTCI-StateType of the target cell is 'joint', the first TCI state refers to a joint TCI state included in the first TCI state; when the unifiedTCI-StateType of the target cell is 'separate', the first TCI state refers to a downlink TCI state or an uplink TCI state included in the first TCI state.

[0190] In some embodiments, the receiving downlink information or sending uplink information according to the reference signal indicated by the first signaling includes at least: determining a PRACH occasion, and / or determining a QCL or a spatial filter for the downlink information or the uplink information.

[0191] For example, during the random access process, the terminal device determines the PRACH occasion based on the SSB indicated by the cell handover command, and determines the QCL or spatial filter for the received downlink information or the transmitted uplink information. For example, the terminal device assumes that the DM-RS of Msg2 is quasi-co-located with the SSB indicated by the cell handover command.

[0192] In this way, the beam-related parameters of the downlink information received or the uplink information sent by the terminal device can be determined.

[0193] The above embodiments are merely exemplary of the present invention, but the present invention is not limited thereto. Appropriate modifications may be made based on the above embodiments. For example, the above embodiments may be used alone, or one or more of the above embodiments may be combined.

[0194] It can be seen from the above embodiment that the terminal device receives the first signaling and performs random access after receiving the first signaling; and in the case where the random access is a contention-based random access, after the random access is completed and before the first time point, the terminal device receives downlink information or sends uplink information according to the first TCI state indicated by the first signaling, and / or the terminal device receives downlink information or sends uplink information according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access. In this way, the ambiguity caused by the terminal device determining which beam and beam-related parameters to use to receive downlink information or send uplink information within a certain time period after the random access is completed can be avoided, so that the terminal device and the network device can accurately and quickly send and receive uplink information or downlink information, and the terminal device can always use the best beam to transmit information with the target cell, which is conducive to improving the reliability or throughput of the transmission.

[0195] Embodiments of the second aspect

[0196] The embodiment of the present application provides a data transceiver method, which is applied to a network device. The embodiment of the present application can be combined with the embodiment of the first aspect, or can be implemented independently. The contents that are the same as those of the embodiment of the first aspect are not repeated here.

[0197] FIG6 is a schematic diagram of another data transceiver method according to an embodiment of the present application. As shown in FIG6 , the method includes:

[0198] 601, the network device sends a first signaling to the terminal device,

[0199] 602. The network device receives or sends uplink information sent by the terminal device or downlink information received, wherein the terminal device performs random access after receiving the first signaling, and in the case where the random access is a contention-based random access, after the random access is completed and before the first time point, the terminal device receives downlink information or sends uplink information according to the first TCI state indicated by the first signaling, and / or the terminal device receives downlink information or sends uplink information according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0200] In this way, ambiguity caused by the terminal device determining which beam to use and beam-related parameters to receive downlink information or send uplink information within a certain period of time after the random access is completed can be avoided, so that uplink information or downlink information can be sent and received accurately and quickly between the terminal device and the network device, and the terminal device can always use the best beam to transmit information with the target cell, which is conducive to improving the reliability or throughput of the transmission.

[0201] In some embodiments, after the terminal device completes the random access, the network device sends a second signaling, wherein the second signaling indicates or does not indicate a second TCI state, wherein the first time point is the time point when the terminal device applies the second TCI state, or the first time point is the time point when the terminal device receives the second signaling.

[0202] It is worth noting that FIG6 above is merely a schematic illustration of an embodiment of the present application, and the present application is not limited thereto. For example, the execution order of the various operations may be appropriately adjusted, and other operations may be added or some operations may be reduced. Those skilled in the art may make appropriate modifications based on the above description, and are not limited to the description of FIG6 above.

[0203] The above embodiments are merely exemplary of the present invention, but the present invention is not limited thereto. Appropriate modifications may be made based on the above embodiments. For example, the above embodiments may be used alone, or one or more of the above embodiments may be combined.

[0204] It can be seen from the above embodiment that the terminal device receives the first signaling and performs random access after receiving the first signaling; and in the case where the random access is a contention-based random access, after the random access is completed and before the first time point, the terminal device receives downlink information or sends uplink information according to the first TCI state indicated by the first signaling, and / or the terminal device receives downlink information or sends uplink information according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access. In this way, the ambiguity caused by the terminal device determining which beam and beam-related parameters to use to receive downlink information or send uplink information within a certain time period after the random access is completed can be avoided, so that the terminal device and the network device can accurately and quickly send and receive uplink information or downlink information, and the terminal device can always use the best beam to transmit information with the target cell, which is conducive to improving the reliability or throughput of the transmission.

[0205] Embodiments of the third aspect

[0206] The embodiment of the present application provides a data transceiver device, which may be, for example, a terminal device, or one or more components or assemblies configured in the terminal device; in addition, the same contents as those in the embodiment of the first aspect are not repeated here.

[0207] FIG7 is a schematic diagram of a data transceiver device according to an embodiment of the present application. As shown in FIG7 , the data transceiver device 700 includes:

[0208] The first transceiver unit 701 receives the first signaling,

[0209] An executing unit 702, which performs random access after receiving the first signaling;

[0210] In the case where the random access is contention-based random access, after the random access is completed and before the first time point, the first transceiver unit 701 receives downlink information or sends uplink information according to the first transmission configuration indication state (TCI state) indicated by the first signaling, and / or the first transceiver unit 701 receives downlink information or sends uplink information according to the system synchronization block (SSB) selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0211] In this way, ambiguity caused by the terminal device determining which beam to use and beam-related parameters to receive downlink information or send uplink information within a certain period of time after the random access is completed can be avoided, so that uplink information or downlink information can be sent and received accurately and quickly between the terminal device and the network device, and the terminal device can always use the best beam to transmit information with the target cell, which is conducive to improving the reliability or throughput of the transmission.

[0212] In some embodiments, the first information sent by the terminal device includes at least one of the following: a physical uplink shared channel (PUSCH) scheduled by a random access response (RAR) uplink grant (UL grant); a preamble; a message A physical uplink shared channel (MsgA PUSCH); or a physical uplink shared channel (PUSCH) scheduled by a fallback random access response (fallback RAR) uplink grant (UL grant).

[0213] In some embodiments, when the random access is a contention-based random access, after the random access is completed and before the first time point, when a first condition is met, the first transceiver unit 701 receives downlink information or sends uplink information according to the first transmission configuration indication state (TCI state) indicated by the first signaling, and / or, when a second condition is met, the first transceiver unit 701 receives downlink information or sends uplink information according to the system synchronization block (SSB) selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0214] In some embodiments, the first transceiver unit 701 receives second signaling after the random access is completed, wherein the second signaling indicates or does not indicate a second transmission configuration indication state (TCI state), wherein the first time point is the time point when the terminal device applies the second transmission configuration indication state (TCI state), or the first time point is the time point when the terminal device receives the second signaling.

[0215] In some implementations, the receiving downlink information or sending uplink information includes: determining a QCL or a spatial filter for the downlink information or the uplink information.

[0216] In some embodiments, the first condition includes at least one of the following:

[0217] The system synchronization block (SSB) selected by the terminal device in the random access is the same as the system synchronization block (SSB) associated with the first transmission configuration indication state (TCI state) indicated by the first signaling; or the first transmission configuration indication state (TCI state) indicated by the first signaling includes a downlink transmission configuration indication state (TCI state) and an uplink transmission configuration indication state (TCI state).

[0218] In some embodiments, the system synchronization block (SSB) selected by the terminal device in the random access is the same as the system synchronization block (SSB) associated with the first transmission configuration indication state (TCI state) indicated by the first signaling, including at least one of the following:

[0219] The system synchronization block (SSB) selected by the terminal device in the random access is the same as the system synchronization block (SSB) associated with the joint transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling;

[0220] The system synchronization block (SSB) selected by the terminal device in the random access is the same as the system synchronization block (SSB) associated with the downlink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling, and the system synchronization block (SSB) selected by the terminal device in the random access is the same as the system synchronization block (SSB) associated with the uplink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling;

[0221] The system synchronization block (SSB) selected by the terminal device in the random access is the same as the system synchronization block (SSB) associated with the downlink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling, and the system synchronization block (SSB) selected by the terminal device in the random access is different from the system synchronization block (SSB) associated with the uplink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling; or

[0222] The system synchronization block (SSB) selected by the terminal device in the random access is different from the system synchronization block (SSB) associated with the downlink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling, and the system synchronization block (SSB) selected by the terminal device in the random access is the same as the system synchronization block (SSB) associated with the uplink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling.

[0223] In some embodiments, the second condition includes at least:

[0224] The system synchronization block (SSB) selected by the terminal device in the random access is different from the system synchronization block (SSB) associated with the first transmission configuration indication state (TCI state) indicated by the first signaling.

[0225] In some embodiments, the system synchronization block (SSB) selected by the terminal device in the random access is different from the system synchronization block (SSB) associated with the first transmission configuration indication state (TCI state) indicated by the first signaling, including at least one of the following:

[0226] A system synchronization block (SSB) selected by the terminal device in the random access is different from a system synchronization block (SSB) associated with a joint transmission configuration indication state (TCI state) in a first transmission configuration indication state (TCI state) indicated by the first signaling;

[0227] The system synchronization block (SSB) selected by the terminal device in the random access is different from the system synchronization block (SSB) associated with the downlink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling, and the system synchronization block (SSB) selected by the terminal device in the random access is different from the system synchronization block (SSB) associated with the uplink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling;

[0228] The system synchronization block (SSB) selected by the terminal device in the random access is the same as the system synchronization block (SSB) associated with the downlink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling, and the system synchronization block (SSB) selected by the terminal device in the random access is different from the system synchronization block (SSB) associated with the uplink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling; or

[0229] The system synchronization block (SSB) selected by the terminal device in the random access is different from the system synchronization block (SSB) associated with the downlink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling, and the system synchronization block (SSB) selected by the terminal device in the random access is the same as the system synchronization block (SSB) associated with the uplink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling.

[0230] In some embodiments, when the random access is contention-based random access, after the random access is completed and before the first time point, and when the first transmission configuration indication state (TCI state) indicated by the first signaling includes a downlink transmission configuration indication state (TCI state) and an uplink transmission configuration indication state (TCI state),

[0231] The first transceiver unit 701 sends the uplink information according to the uplink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling; and

[0232] When the first condition is met, the first transceiver unit 701 receives the downlink information according to the downlink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling, and / or, when the second condition is met, the first transceiver unit 701 receives the downlink information according to the system synchronization block (SSB) selected by the terminal device in the random access.

[0233] In some embodiments, when receiving downlink information or sending uplink information based on the system synchronization block (SSB) selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access, the first transceiver unit 701 does not retain the first transmission configuration indication state (TCI state) indicated by the first signaling.

[0234] In some embodiments, when the random access is contention-based random access, the first transceiver unit 701 selects a system synchronization block (SSB) in the random access, and receives downlink information or sends uplink information according to the selected system synchronization block (SSB).

[0235] In some implementations, receiving downlink information or sending uplink information according to the selected system synchronization block (SSB) includes at least:

[0236] A physical random access channel occasion (PRACH occasion) is determined, and / or a quasi co-location (QCL) or spatial filter is determined for the downlink information or the uplink information.

[0237] In some embodiments, when the random access is non-contention-based random access, after the random access is completed and before the first time point, the first transceiver unit 701 receives downlink information or sends uplink information according to the first transmission configuration indication state (TCI state) indicated by the first signaling.

[0238] In some implementations, when the random access is a non-contention-based random access, in the random access, the first transceiver unit 701 receives downlink information or sends uplink information according to the reference signal indicated by the first signaling.

[0239] In some implementations, the reference signal indicated by the first signaling includes at least one of the following:

[0240] a system synchronization block (SSB) indicated by the first signaling,

[0241] a channel state information reference signal (CSI-RS) indicated by the first signaling,

[0242] a system synchronization block (SSB) associated with the first transmission configuration indication state (TCI state) indicated by the first signaling, or,

[0243] The first transmission configuration indication state (TCI state) indicated by the first signaling is associated with a channel state information reference signal (CSI-RS).

[0244] In some implementations, the receiving downlink information or sending uplink information according to the reference signal indicated by the first signaling at least includes:

[0245] A physical random access channel occasion (PRACH occasion) is determined, and / or a quasi co-location (QCL) or spatial filter is determined for the downlink information or the uplink information.

[0246] In some embodiments, the first transmission configuration indication state (TCI state) includes a joint transmission configuration indication state (TCI state), or the first transmission configuration indication state (TCI state) includes a downlink transmission configuration indication state (TCI state) and an uplink transmission configuration indication state (TCI state).

[0247] In some embodiments, the second transmission configuration indication state (TCI state) includes at least one of the following:

[0248] A combined transmission configuration indication state (TCI state);

[0249] A downlink transmission configuration indication state (TCI state) and an uplink transmission configuration indication state (TCI state);

[0250] A downlink transmission configuration indication state (TCI state); or,

[0251] An uplink transmission configuration indication state (TCI state).

[0252] In some implementations, the first signaling is a cell handover command, wherein the cell handover command is carried via MAC Control Element (MAC CE) signaling.

[0253] In some embodiments, the second signaling is at least one of the following: MAC CE signaling, DCI signaling, or RRC signaling.

[0254] The above embodiments are merely exemplary of the present invention, but the present invention is not limited thereto. Appropriate modifications may be made based on the above embodiments. For example, the above embodiments may be used alone, or one or more of the above embodiments may be combined.

[0255] It is worth noting that the above description only describes the components or modules related to the present application, but the present application is not limited thereto. The data transceiver device 700 may also include other components or modules. For the specific contents of these components or modules, reference may be made to the relevant art.

[0256] In addition, for the sake of simplicity, FIG7 only illustrates the connection relationship or signal direction between various components or modules. However, it should be clear to those skilled in the art that various related technologies such as bus connection can be used. The above-mentioned components or modules can be implemented by hardware facilities such as processors, memories, transmitters, and receivers; the implementation of this application is not limited to this.

[0257] It can be seen from the above embodiment that the terminal device receives the first signaling and performs random access after receiving the first signaling; and in the case where the random access is a contention-based random access, after the random access is completed and before the first time point, the terminal device receives downlink information or sends uplink information according to the first TCI state indicated by the first signaling, and / or the terminal device receives downlink information or sends uplink information according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access. In this way, the ambiguity caused by the terminal device determining which beam and beam-related parameters to use to receive downlink information or send uplink information within a certain time period after the random access is completed can be avoided, so that the terminal device and the network device can accurately and quickly send and receive uplink information or downlink information, and the terminal device can always use the best beam to transmit information with the target cell, which is conducive to improving the reliability or throughput of the transmission.

[0258] Embodiments of the fourth aspect

[0259] The embodiment of the present application provides a data transceiver device, which may be, for example, a network device, or one or more components or assemblies configured in the network device; in addition, the same contents as those in the embodiment of the first aspect are not repeated here.

[0260] FIG8 is a schematic diagram of another data transceiver device according to an embodiment of the present application. As shown in FIG8 , the data transceiver device 800 includes:

[0261] The second transceiver unit 801 sends a first signaling to the terminal device,

[0262] The second transceiver unit 801 receives or sends uplink information sent or downlink information received by the terminal device, wherein the terminal device performs random access after receiving the first signaling, and in the case where the random access is a contention-based random access, after the random access is completed and before the first time point, the terminal device receives downlink information or sends uplink information according to the first transmission configuration indication state (TCI state) indicated by the first signaling, and / or the terminal device receives downlink information or sends uplink information according to the system synchronization block (SSB) selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0263] In this way, ambiguity caused by the terminal device determining which beam to use and beam-related parameters to receive downlink information or send uplink information within a certain period of time after the random access is completed can be avoided, so that uplink information or downlink information can be sent and received accurately and quickly between the terminal device and the network device, and the terminal device can always use the best beam to transmit information with the target cell, which is conducive to improving the reliability or throughput of the transmission.

[0264] In some embodiments, after the terminal device completes the random access, the second transceiver unit 801 sends a second signaling, wherein the second signaling indicates or does not indicate a second TCI state, wherein the first time point is the time point when the terminal device applies the second TCI state, or the first time point is the time point when the terminal device receives the second signaling.

[0265] The above embodiments are merely exemplary of the present invention, but the present invention is not limited thereto. Appropriate modifications may be made based on the above embodiments. For example, the above embodiments may be used alone, or one or more of the above embodiments may be combined.

[0266] It is worth noting that the above description only describes the components or modules related to the present application, but the present application is not limited thereto. The data transceiver device 800 may also include other components or modules. For the specific contents of these components or modules, reference may be made to the relevant art.

[0267] In addition, for the sake of simplicity, FIG8 only illustrates the connection relationship or signal direction between various components or modules. However, it should be clear to those skilled in the art that various related technologies such as bus connection can be used. The above-mentioned components or modules can be implemented by hardware facilities such as processors, memories, transmitters, and receivers; the implementation of this application is not limited to this.

[0268] It can be seen from the above embodiment that the terminal device receives the first signaling and performs random access after receiving the first signaling; and in the case where the random access is a contention-based random access, after the random access is completed and before the first time point, the terminal device receives downlink information or sends uplink information according to the first TCI state indicated by the first signaling, and / or the terminal device receives downlink information or sends uplink information according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access. In this way, the ambiguity caused by the terminal device determining which beam and beam-related parameters to use to receive downlink information or send uplink information within a certain time period after the random access is completed can be avoided, so that the terminal device and the network device can accurately and quickly send and receive uplink information or downlink information, and the terminal device can always use the best beam to transmit information with the target cell, which is conducive to improving the reliability or throughput of the transmission.

[0269] Embodiments of the fifth aspect

[0270] An embodiment of the present application also provides a communication system, and reference may be made to FIG1 . The contents that are the same as those in the embodiments of the first to fourth aspects will not be repeated.

[0271] In some embodiments, the communication system 100 may include at least:

[0272] A network device that sends a first signaling, and

[0273] A terminal device that receives the first signaling and performs random access after receiving the first signaling; wherein, in the case where the random access is a contention-based random access, after the random access is completed and before a first time point, the terminal device receives downlink information or sends uplink information according to the first TCI state indicated by the first signaling, and / or the terminal device receives downlink information or sends uplink information according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0274] In this way, ambiguity caused by the terminal device determining which beam to use and beam-related parameters to receive downlink information or send uplink information within a certain period of time after the random access is completed can be avoided, so that uplink information or downlink information can be sent and received accurately and quickly between the terminal device and the network device, and the terminal device can always use the best beam to transmit information with the target cell, which is conducive to improving the reliability or throughput of the transmission.

[0275] An embodiment of the present application further provides a network device, which may be, for example, a base station, but the present application is not limited thereto and may also be other network devices.

[0276] Figure 9 is a schematic diagram illustrating the structure of a network device according to an embodiment of the present application. As shown in Figure 9 , network device 900 may include a processor 910 (e.g., a central processing unit (CPU)) and a memory 920 ; the memory 920 is coupled to the processor 910 . The memory 920 may store various data and may also store an information processing program 930 , which is executed under the control of the processor 910 .

[0277] In addition, as shown in Figure 9, network device 900 may further include: a transceiver 940 and an antenna 950; wherein, the functions of these components are similar to those in the prior art and are not further described here. It is worth noting that network device 900 does not necessarily include all the components shown in Figure 9; in addition, network device 900 may also include components not shown in Figure 9, and reference may be made to the prior art for details.

[0278] The embodiment of the present application also provides a terminal device, but the present application is not limited thereto and may also be other devices.

[0279] Figure 10 is a schematic diagram of a terminal device according to an embodiment of the present application. As shown in Figure 10 , terminal device 1000 may include a processor 1010 and a memory 1020. Memory 1020 stores data and programs and is coupled to processor 1010. It should be noted that this diagram is exemplary; other types of structures may be used to supplement or replace this structure to implement telecommunication or other functions.

[0280] For example, the processor 1010 may be configured to execute a program to implement the uplink data transceiving method as described in the embodiment of the first aspect. For example, the processor 1010 may be configured to perform the following control: receive first signaling, and perform random access after receiving the first signaling; and, when the random access is contention-based random access, after the random access is completed and before the first time point, receive downlink information or send uplink information according to the first TCI state indicated by the first signaling, and / or, receive downlink information or send uplink information according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0281] As shown in Figure 10 , the terminal device 1000 may further include: a communication module 1030, an input unit 1040, a display 1050, and a power supply 1060. The functions of these components are similar to those in the prior art and are not described in detail here. It is worth noting that the terminal device 1000 does not necessarily include all of the components shown in Figure 10 , and these components are not essential. Furthermore, the terminal device 1000 may also include components not shown in Figure 10 , for which reference may be made to the prior art.

[0282] An embodiment of the present application also provides a computer program, wherein when the program is executed in a terminal device, the program enables the terminal device to execute the data sending and receiving method described in the embodiment of the first aspect.

[0283] An embodiment of the present application also provides a storage medium storing a computer program, wherein the computer program enables a terminal device to execute the data sending and receiving method described in the embodiment of the first aspect.

[0284] An embodiment of the present application also provides a computer program, wherein when the program is executed in a terminal device, the program enables the terminal device to execute the data sending and receiving method described in the embodiment of the second aspect.

[0285] An embodiment of the present application also provides a storage medium storing a computer program, wherein the computer program enables a terminal device to execute the data sending and receiving method described in the embodiment of the second aspect.

[0286] The above devices and methods of the present application can be implemented by hardware or by a combination of hardware and software. The present application relates to such a computer-readable program that, when executed by a logic component, enables the logic component to implement the devices or components described above, or enables the logic component to implement the various methods or steps described above. The present application also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, etc.

[0287] The method / device described in conjunction with the embodiments of the present application can be directly embodied as hardware, a software module executed by a processor, or a combination of the two. For example, one or more of the functional block diagrams shown in the figure and / or one or more combinations of functional block diagrams can correspond to various software modules of the computer program flow or to various hardware modules. These software modules can respectively correspond to the various steps shown in the figure. These hardware modules can be implemented by solidifying these software modules, for example, using a field programmable gate array (FPGA).

[0288] The software module may be located in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. A storage medium may be coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium may be an integral part of the processor. The processor and the storage medium may be located in an ASIC. The software module may be stored in the memory of the mobile terminal or in a memory card that can be inserted into the mobile terminal. For example, if the device (such as a mobile terminal) uses a large-capacity MEGA-SIM card or a large-capacity flash memory device, the software module may be stored in the MEGA-SIM card or the large-capacity flash memory device.

[0289] One or more of the functional blocks and / or one or more combinations of functional blocks described in the accompanying drawings may be implemented as a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or any appropriate combination thereof for performing the functions described in this application. One or more of the functional blocks and / or one or more combinations of functional blocks described in the accompanying drawings may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in communication with a DSP, or any other such configuration.

[0290] The present application has been described above in conjunction with specific embodiments. However, those skilled in the art should understand that these descriptions are merely illustrative and are not intended to limit the scope of protection of the present application. Those skilled in the art may make various modifications and variations to the present application based on the spirit and principles of the present application, and such modifications and variations are also within the scope of the present application.

[0291] Regarding the implementation methods including the above embodiments, the following additional notes are also disclosed:

[0292] 1. A communication system comprising:

[0293] A network device that sends a first signaling, and

[0294] A terminal device that receives the first signaling and performs random access after receiving the first signaling; wherein, in the case where the random access is a contention-based random access, after the random access is completed and before a first time point, the terminal device receives downlink information or sends uplink information according to the first TCI state indicated by the first signaling, and / or the terminal device receives downlink information or sends uplink information according to the SSB selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

[0295] 2. The communication system according to Supplement 1, wherein:

[0296] In a case where the random access is contention-based random access, after the random access is completed and before the first time point, and in a case where a first transmission configuration indication state (TCI state) indicated by the first signaling includes a downlink transmission configuration indication state (TCI state) and an uplink transmission configuration indication state (TCI state),

[0297] The terminal device sends the uplink information according to an uplink transmission configuration indication state (TCI state) in a first transmission configuration indication state (TCI state) indicated by the first signaling; and

[0298] When the first condition is met, the terminal device receives the downlink information according to the downlink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling, and / or, when the second condition is met, the terminal device receives the downlink information according to the system synchronization block (SSB) selected by the terminal device in the random access.

Claims

1. A data transceiver device, configured in a terminal device, wherein: The data transceiver device comprises: A first transceiver unit receives a first signaling. an execution unit, configured to perform random access after receiving the first signaling; In the case where the random access is a contention-based random access, after the random access is completed and before a first time point, the first transceiver unit receives downlink information or sends uplink information according to a first transmission configuration indication state (TCI state) indicated by the first signaling, and / or the first transceiver unit receives downlink information or sends uplink information according to a system synchronization block (SSB) selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

2. The device according to claim 1, wherein: The first information sent by the terminal device includes at least one of the following: Physical uplink shared channel (PUSCH) scheduled by random access response (RAR) uplink grant (UL grant); Preamble; Message A Physical Uplink Shared Channel (MsgA PUSCH); or, Physical Uplink Shared Channel (PUSCH) scheduled by fallback random access response (fallback RAR) uplink grant (UL grant).

3. The device according to claim 1, wherein: In the case where the random access is a contention-based random access, after the random access is completed and before a first time point, when a first condition is met, the first transceiver unit receives downlink information or sends uplink information according to a first transmission configuration indication state (TCI state) indicated by the first signaling, and / or, when a second condition is met, the first transceiver unit receives downlink information or sends uplink information according to a system synchronization block (SSB) selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

4. The device according to claim 1, wherein: The first transceiver unit receives a second signaling after the random access is completed, wherein the second signaling indicates or does not indicate a second transmission configuration indication state (TCI state), The first time point is the time point at which the terminal device applies the second transmission configuration indication state (TCI state), or the first time point is the time at which the terminal device receives the second signaling. point.

5. The device according to claim 1, wherein: The receiving of downlink information or the sending of uplink information at least includes: determining a QCL or a spatial filter for the downlink information or the uplink information.

6. The device according to claim 3, wherein: The first condition includes at least one of the following: The system synchronization block (SSB) selected by the terminal device in the random access is the same as the system synchronization block (SSB) associated with the first transmission configuration indication state (TCI state) indicated by the first signaling; or, The first transmission configuration indication state (TCI state) indicated by the first signaling includes a downlink transmission configuration indication state (TCI state) and an uplink transmission configuration indication state (TCI state).

7. The device according to claim 6, wherein: The system synchronization block (SSB) selected by the terminal device in the random access is the same as the system synchronization block (SSB) associated with the first transmission configuration indication state (TCI state) indicated by the first signaling, and includes at least one of the following: The system synchronization block (SSB) selected by the terminal device in the random access is the same as the system synchronization block (SSB) associated with the joint transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling; The system synchronization block (SSB) selected by the terminal device in the random access is the same as the system synchronization block (SSB) associated with the downlink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling, and the system synchronization block (SSB) selected by the terminal device in the random access is the same as the system synchronization block (SSB) associated with the uplink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling; The system synchronization block (SSB) selected by the terminal device in the random access is the same as the system synchronization block (SSB) associated with the downlink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling, and the system synchronization block (SSB) selected by the terminal device in the random access is different from the system synchronization block (SSB) associated with the uplink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling; or The system synchronization block (SSB) selected by the terminal device in the random access is different from the system synchronization block (SSB) associated with the downlink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling, and the system synchronization block (SSB) selected by the terminal device in the random access is the same as the system synchronization block (SSB) associated with the uplink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling.

8. The device according to claim 3, wherein: The second condition at least includes: The system synchronization block (SSB) selected by the terminal device in the random access is different from the system synchronization block (SSB) associated with the first transmission configuration indication state (TCI state) indicated by the first signaling.

9. The device according to claim 8, wherein: The system synchronization block (SSB) selected by the terminal device in the random access is different from the system synchronization block (SSB) associated with the first transmission configuration indication state (TCI state) indicated by the first signaling, and includes at least one of the following: The system synchronization block (SSB) selected by the terminal device in the random access is different from the system synchronization block (SSB) associated with the joint transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling; The system synchronization block (SSB) selected by the terminal device in the random access is different from the system synchronization block (SSB) associated with the downlink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling, and the system synchronization block (SSB) selected by the terminal device in the random access is different from the system synchronization block (SSB) associated with the uplink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling; The system synchronization block (SSB) selected by the terminal device in the random access is the same as the system synchronization block (SSB) associated with the downlink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling, and the system synchronization block (SSB) selected by the terminal device in the random access is different from the system synchronization block (SSB) associated with the uplink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling; or The system synchronization block (SSB) selected by the terminal device in the random access is different from the system synchronization block (SSB) associated with the downlink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling, and the system synchronization block (SSB) selected by the terminal device in the random access is the same as the system synchronization block (SSB) associated with the uplink transmission configuration indication state (TCI state) in the first transmission configuration indication state (TCI state) indicated by the first signaling.

10. The device according to claim 1, wherein: When receiving downlink information or sending uplink information based on the system synchronization block (SSB) selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access, the first transceiver unit does not retain the first transmission configuration indication state (TCI state) indicated by the first signaling.

11. The device according to claim 1, wherein: In case that the random access is contention-based random access, the first transceiver unit selects a system synchronization block (SSB) in the random access, and receives downlink information or sends uplink information according to the selected system synchronization block (SSB).

12. The device according to claim 11, wherein The receiving downlink information or sending uplink information according to the selected system synchronization block (SSB) at least comprises: A physical random access channel occasion (PRACH occasion) is determined, and / or a quasi co-location (QCL) or a spatial filter is determined for the downlink information or the uplink information.

13. The device according to claim 1, wherein: In a case where the random access is a non-contention-based random access, after the random access is completed and before the first time point, the first transceiver unit receives downlink information or sends uplink information according to a first transmission configuration indication state (TCI state) indicated by the first signaling.

14. The device according to claim 1, wherein: In a case where the random access is a non-contention-based random access, in the random access, the first transceiver unit receives downlink information or sends uplink information according to a reference signal indicated by the first signaling.

15. The device according to claim 14, wherein: The reference signal indicated by the first signaling includes at least one of the following: a system synchronization block (SSB) indicated by the first signaling, a channel state information reference signal (CSI-RS) indicated by the first signaling, a system synchronization block (SSB) associated with the first transmission configuration indication state (TCI state) indicated by the first signaling, or, The first transmission configuration indication state (TCI state) indicated by the first signaling is associated with a channel state information reference signal (CSI-RS).

16. The device according to claim 14, wherein: The receiving downlink information or sending uplink information according to the reference signal indicated by the first signaling at least includes: A physical random access channel occasion (PRACH occasion) is determined, and / or a quasi co-location (QCL) or a spatial filter is determined for the downlink information or the uplink information.

17. The device according to claim 1, wherein: The first transmission configuration indication state (TCI state) includes a joint transmission configuration indication state (TCI state), or the first transmission configuration indication state (TCI state) includes a downlink transmission configuration indication state (TCI state) and an uplink transmission configuration indication state (TCI state).

18. The device according to claim 4, wherein: The second transmission configuration indication state (TCI state) includes at least one of the following: A joint transmission configuration indication state (TCI state); A downlink transmission configuration indication state (TCI state) and an uplink transmission configuration indication state (TCI state); A downlink transmission configuration indication state (TCI state); or, An uplink transmission configuration indication state (TCI state).

19. The device according to claim 1, wherein: The first signaling is a cell switching command, wherein the cell switching command is carried by MAC control element (MAC CE) signaling.

20. A data transceiver device, configured in a network device, the data transceiver device comprising: The second transceiver unit sends a first signaling to the terminal device, The second transceiver unit receives or sends uplink information sent or downlink information received by the terminal device, wherein the terminal device performs random access after receiving the first signaling, and in the case where the random access is a contention-based random access, after the random access is completed and before a first time point, the terminal device receives downlink information or sends uplink information according to a first transmission configuration indication state (TCI state) indicated by the first signaling, and / or the terminal device receives downlink information or sends uplink information according to a system synchronization block (SSB) selected by the terminal device in the random access and / or the first information sent by the terminal device in the random access.

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