Data receiving method and device, storage medium, and terminal

Abstract

A data receiving method, device, storage medium, and terminal. The method includes: detecting a downlink signal within a fixed frame period; if the downlink signal is successfully detected within the fixed frame period, determining that uplink transmission or downlink reception can be performed within the fixed frame period. The technical solution provided by the present invention is beneficial to improving the success probability of a terminal seizing a channel.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technologies, and particularly to a data receiving method, an apparatus, a storage medium, and a terminal. Background Art

[0002] The 3rd Generation Partnership Project (3GPP) standard organization is researching the new radio (NR, also known as the new air interface) system of the Fifth-Generation mobile communications (5G).

[0003] In the unlicensed spectrum, a base station (such as a gNB) and / or a UE can perform Listen-Before-Talk (LBT), Channel Access Assessment (CAA), or Sensing channel to evaluate whether the channel is idle or busy. When the evaluation result meets certain conditions, the base station and / or the UE can obtain Channel Occupancy (CO) or channel access within the Channel Occupancy Time (COT), which is also called the channel occupancy initiated by the base station.

[0004] Generally, the base station can send channel occupancy-related information through the Group Common Physical Downlink Control Channel (GC-PDCCH). That is, when the base station obtains channel occupancy, it can notify the User Equipment (UE) through the GC-PDCCH that the base station has obtained channel occupancy, and the UE can perform uplink transmission or downlink reception within the channel occupancy time.

[0005] In the prior art, when the UE is in the idle state, the UE cannot actually know whether the channel is available. Summary of the Invention

[0006] The technical problem solved by the present invention is that a UE in the idle state cannot know whether the channel is available.

[0007] To solve the above technical problems, an embodiment of the present invention provides a data receiving method, including: detecting a downlink signal within a fixed frame period; if the downlink signal is successfully detected within the fixed frame period, determining that uplink transmission or downlink reception can be performed within the fixed frame period, including: if a paging indication is detected within the fixed frame period, determining that uplink transmission or downlink reception can be performed within the fixed frame period.

[0008] Optionally, the downlink signal is a downlink control signal.

[0009] Optionally, the downlink signal includes one or more of the following: PDCCH, SSB, PBCH.

[0010] Optionally, the uplink transmission includes one or more of the following: PUCCH transmission, CG-PUSCH transmission, periodic SRS transmission, semi-persistent SRS transmission, PRACH transmission, autonomous uplink transmission.

[0011] Optionally, the downlink reception includes one or more of the following: CSI-RS reception, semi-persistent scheduled PDSCH reception.

[0012] Optionally, the determination that uplink transmission can be performed within the fixed frame period refers to using high-priority channel sensing or high-priority channel assessment or high-priority LBT before uplink transmission.

[0013] Optionally, the determination that uplink transmission can be performed within the fixed frame period refers to performing uplink transmission when the channel is sensed idle for a first duration or performing uplink transmission without sensing the channel.

[0014] Optionally, the downlink signal is PDCCH, and the bandwidth of the downlink reception is within the LBT bandwidth or LBT sub-band where the PDCCH is located; or, the bandwidth of the downlink reception is within the LBT bandwidth or LBT sub-band of the control resource set to which the PDCCH belongs.

[0015] Optionally, the downlink signal is PDCCH, and the scrambling of the PDCCH is selected from: C-RNTI, SI-RNTI, P-RNTI, RA-RNTI, TC-RNTI.

[0016] Optionally, the downlink signal is PDCCH, and the PDCCH is a PDCCH carrying a paging indication.

[0017] Optionally, the downlink signal is a paging PDCCH or an OSI PDCCH, and the number of monitoring opportunities for the paging PDCCH or the number of monitoring opportunities for the OSI PDCCH is S; where S is the number of truly transmitted SSBs indicated by the base station, or S is the number of SSBs within a subset of the set of truly transmitted SSBs indicated by the base station, and S is an integer.

[0018] Optionally, the subset of the set of truly transmitted SSBs is a set formed by non-quasi co-located SSBs.

[0019] Optionally, there is a time interval between the start time of the uplink transmission and the start time of the fixed frame period; or there is a time interval between the start time of the downlink reception and the start time of the fixed frame period.

[0020] Optionally, there is a time interval between the start time of the uplink transmission and the first GC-PDCCH; or there is a time interval between the start time of the downlink reception and the first GC-PDCCH; where the first GC-PDCCH refers to the GC-PDCCH closest to the start time.

[0021] Optionally, the time interval is predefined or configured by the base station.

[0022] Optionally, the downlink signal is a PDCCH, and successfully detecting the downlink signal means passing the CRC check of the PDCCH.

[0023] Optionally, the downlink signal is an SSB, and the bandwidth of the downlink reception is within the LBT bandwidth or LBT sub-band where the SSB is located; or the bandwidth of the downlink reception is within the LBT bandwidth or LBT sub-band of the bandwidth part to which the SSB belongs.

[0024] Optionally, successfully detecting the downlink signal means that the user equipment determines that the base station emits the SSB.

[0025] Optionally, the downlink signal is a PBCH, and the bandwidth of the downlink reception is within the LBT bandwidth or LBT sub-band where the PBCH is located; or the bandwidth of the downlink reception is within the LBT bandwidth or LBT sub-band of the bandwidth part to which the PBCH belongs.

[0026] Optionally, successfully detecting the downlink signal means passing the CRC check of the PBCH.

[0027] Optionally, the downlink signal is an SSB or a PBCH, and the number of monitored SSBs or PBCHs is S; where S is the number of transmitted SSBs indicated by the base station, or S is the number of SSBs within a subset of the set of actually transmitted SSBs indicated by the base station, and S is an integer.

[0028] Optionally, the subset of the set of actually transmitted SSBs is a set formed by non-quasi co-located SSBs.

[0029] Optionally, the data receiving method further includes: when the PBCH is successfully detected, using the SSB where the PBCH is located as a measurement sample for radio resource management measurement and / or radio link monitoring measurement.

[0030] Optionally, the data receiving method further includes: when the PBCH is successfully detected, using the SSB where the PBCH is located as a synchronization sample for radio link monitoring measurement.

[0031] Optionally, the determining that uplink transmission or downlink reception can be performed within the fixed frame period if the downlink signal is successfully detected within the fixed frame period includes: if the GC-PDCCH is not detected within the fixed frame period, but other downlink signals except the GC-PDCCH are successfully detected, determining that uplink transmission or downlink reception can be performed within the fixed frame period.

[0032] Optionally, the GC-PDCCH is the GC-PDCCH in the idle state.

[0033] Optionally, the configuration information of the GC-PDCCH is carried by SIB1.

[0034] Optionally, the control resource set associated with the GC-PDCCH is default CORESET0.

[0035] Optionally, the GC-PDCCH carries a paging indication.

[0036] Optionally, when the fixed frame period corresponding to the GC-PDCCH in the idle state includes a paging occasion or a paging PDCCH monitoring occasion or a signal related to the random access procedure, monitor the GC-PDCCH in the idle state.

[0037] To solve the above technical problems, an embodiment of the present invention further provides a data receiving device, including: a detection module, configured to detect a downlink signal within a fixed frame period; a determination module, if the downlink signal is successfully detected within the fixed frame period, the determination module is configured to determine that uplink transmission or downlink reception can be performed within the fixed frame period, and if GC-PDCCH is detected within the fixed frame period, it is determined that uplink transmission or downlink reception can be performed within the fixed frame period.

[0038] To solve the above technical problems, an embodiment of the present invention further provides a storage medium, on which computer instructions are stored, and when the computer instructions run, they execute the steps of the above method.

[0039] To solve the above technical problems, an embodiment of the present invention further provides a terminal, including a memory and a processor, where computer instructions that can run on the processor are stored on the memory, and when the processor runs the computer instructions, it executes the steps of the above method.

[0040] Compared with the prior art, the technical solution of the embodiment of the present invention has the following beneficial effects:

[0041] An embodiment of the present invention provides a data receiving method, including: detecting a downlink signal within a fixed frame period; if the downlink signal is successfully detected within the fixed frame period, determining that uplink transmission or downlink reception can be performed within the fixed frame period, including: if GC-PDCCH is detected within the fixed frame period, determining that uplink transmission or downlink reception can be performed within the fixed frame period. Through the technical solution provided by the embodiment of the present invention, GD-PDCCH is introduced in the idle state, so that the UE in the idle state can know whether the channel is available, which is beneficial to improving the success probability of the UE obtaining the channel occupancy of the unlicensed band.

[0042] Further, the uplink transmission includes one or more of the following: PUCCH transmission, CG-PUSCH transmission, periodic SRS transmission, semi-persistent SRS transmission, PRACH transmission, autonomous uplink transmission. The embodiment of the present invention enables the UE to upload periodic uplink data after successfully detecting the downlink signal, and further provides a feasible solution for the UE to use the unlicensed band.

[0043] Further, the determination that uplink transmission can be performed within the fixed frame period means that the UE uses high-priority channel sensing or channel assessment or LBT before uplink transmission, or the UE uses the highest-priority channel sensing or channel assessment or LBT before uplink transmission. The embodiment of the present invention allows the UE to use high-priority channel sensing or channel assessment or LBT before uplink transmission, further providing the possibility for the UE to obtain an unlicensed channel, which is beneficial to increasing the uplink transmission probability. Description of the Drawings

[0044] Figure 1 is a schematic flowchart of a data receiving method according to an embodiment of the present invention;

[0045] Figure 2 is a schematic structural diagram of a data receiving device according to an embodiment of the present invention. Detailed Embodiments

[0046] As described in the background art, when the UE fails to detect the GC-PDCCH, how the UE determines the channel occupancy has become a technical problem that urgently needs to be solved.

[0047] In NR (5G system) version 15 (Release 15, abbreviated as Rel-15), the synchronization signal and the broadcast channel are sent in the form of a synchronization signal block, and the function of sweeping beams is introduced. Among them, the Primary Synchronization Signal (PSS), the Secondary Synchronization Signal (SSS), and the Physical Broadcast Channel (PBCH) are in the Synchronization Signal / PBCH block (SS / PBCH block, abbreviated as SSB).

[0048] Each synchronization signal block corresponds to a predetermined time domain position. This time domain position can also be called a candidate synchronization signal block. The synchronization signal block can be regarded as a resource of the beam (in the analog domain) during the beam sweeping process. Multiple synchronization signal blocks form a synchronization signal burst (SS-burst). The synchronization signal burst can be regarded as a relatively concentrated resource containing multiple beams. Multiple synchronization signal bursts form a synchronization signal burst set. The synchronization signal block is repeatedly sent on different beams to complete the beam scanning process. Through the training of beam scanning, the user equipment can determine on which beam the received signal is the strongest.

[0049] Furthermore, the Remaining Minimum System Information (RMSI, also known as SIB1, i.e., System Information Block 1) in Rel-15 NR is equivalent to SIB1 in LTE and includes the main system information except for the Master Information Block (MIB). RMSI can also be called SIB1. RMSI is carried on the PDSCH, and the PDSCH is scheduled by the Physical Downlink Control Channel (PDCCH). The PDSCH carrying RMSI is generally called the RMSI PDSCH, and the PDCCH scheduling the RMSI PDSCH is generally called the RMSI PDCCH.

[0050] The search space set where the RMSI PDCCH (or SIB1 PDCCH, or Type0-PDCCH) is located is generally called the Type0-PDCCH search space set or the Type0-PDCCH common search space set. Generally, it is configured by the MIB or, in cases such as handover, by the Radio Resource Control (RRC).

[0051] Generally, the Identity (ID) corresponding to the Type0-PDCCH search space set is 0, so it can also be called the search space set 0, and the CORESET it is bound to is called CORESET 0. Except for the search space set of the RMSI PDCCH, other common search spaces or common search space sets, such as the search space set of the Other System Information (OSI) PDCCH (Type0A-PDCCH search space set), the search space set of the Random Access Response (RAR) PDCCH (Type1-PDCCH search space set), the search space set of the paging PDCCH (Type2-PDCCH search space set), etc., can be defaultly the same as the search space set 0. Generally, the above-mentioned common search spaces or common search space sets can be reconfigured.

[0052] The RMSI PDCCH monitoring occasion is related to the synchronization signal block. The UE obtains this relationship according to the RMSI PDCCH monitoring occasion table. During the initial access process, when the UE searches for a certain synchronization signal block, it determines the time-domain position (starting symbol index or first symbol index) of the RMSI PDCCH associated with the synchronization signal block according to the row index of the table indicated by the PBCH, and then can detect the RMSI PDCCH and receive and decode the RMSI PDSCH according to the RMSI PDCCH scheduling.

[0053] In Rel-15 NR, the UE decodes the RMSI PDCCH, obtains multiple bits of time-domain resource allocation, and looks up a predefined table according to these bits to obtain the starting symbol index (or number) and symbol length (or duration) of the RMSI PDSCH.

[0054] Generally, the search space set includes properties such as the monitoring occasion of the PDCCH and the search space type. The search space set is generally bound to a control resource set (CORESET for short), and the CORESET includes properties such as the frequency-domain resource and duration of the PDCCH.

[0055] In Rel-15 NR, for a given UE, its corresponding paging occasion (PO) consists of multiple paging PDCCH monitoring occasions. Within the PO, the paging PDCCH can be sent in the same way as the synchronization signal block by beam sweeping. Within the PO, the paging PDCCH monitoring occasion corresponds to the synchronization signal block one by one, that is, within the PO, the Kth paging PDCCH monitoring occasion corresponds to the Kth synchronization signal block, where K is an integer.

[0056] In Rel-15 NR, generally, the UE is a UE that supports a 100 MHz bandwidth. When the UE makes an initial access, it blindly detects the PSS / SSS / PBCH in the synchronization signal block to obtain the MIB and time index information carried in the PBCH. The UE obtains the configuration of the CORESET (which can be called CORESET0) to which the PDCCH scheduling the SIB1 (or RMSI) belongs and the search space set (which can be called search space set 0) through the information in the MIB. Furthermore, the UE can listen for the Type0-PDCCH scheduling the PDSCH carrying the SIB1 and decode the SIB1. Since the bandwidth of CORESET0 is set in a table in the PBCH, the maximum bandwidth of CORESET0 is implicitly defined in the protocol. Further, the protocol stipulates that the frequency-domain resources of the PDSCH carrying the SIB1 are within the bandwidth (PRB) of CORESET0, so the maximum bandwidth of the PDSCH carrying the SIB1 is also implicitly defined in the protocol.

[0057] On the unlicensed spectrum of NR, it is necessary to define the synchronization signal block so that the user equipment can detect the NR unlicensed spectrum cell during cell search. On the unlicensed spectrum of NR, the base station needs to perform LBT before transmitting the Discovery Reference Signal (DRS) or the synchronization signal block. Only after detecting that the channel is idle can the DRS or the synchronization signal block be transmitted. Otherwise, after a certain period of time, the base station performs LBT again. The transmission of the DRS or the synchronization signal block is carried out within a certain transmission window, which can be agreed upon by the base station and the UE, or configured by the RRC signaling through the Discovery reference signal Measurement Timing Configuration (DMTC) or the Synchronization Measurement Timing Configuration (SMTC). The DRS or the synchronization signal block has multiple predefined time-domain positions.

[0058] On the unlicensed spectrum of NR, the base station may also need to perform LBT before transmitting the RMSI. Only when it detects that the channel is idle can the RMSI be transmitted. Otherwise, after a certain period of time, the base station performs LBT again. The transmission of the RMSI is carried out within a certain transmission window, which can be agreed upon by the base station and the UE, or configured by the MIB or the RRC signaling. Due to the need to perform LBT, the RMSI needs to be shifted backward by a certain amount of time. To support the characteristic that the RMSI on the unlicensed spectrum can be shifted backward, the RMSI needs to have multiple predefined time-domain positions.

[0059] On the unlicensed spectrum of NR, the base station obtains a transmission opportunity (TXOP) through LBT and will send an initial signal to tell the UE that the base station has obtained the transmission opportunity. When the UE successfully detects the initial signal, it knows that the base station has obtained the transmission opportunity and starts a series of behaviors, such as listening to the PDCCH, etc. The initial signal can also be called a preamble, or a Wake-Up Signal (WUS). The UE defaults to detecting the initial signal during the active time, and only starts listening to the PDCCH when the initial signal is detected. In this way, the initial signal also has the function of power saving. Therefore, it can also be called a Power Saving Signal.

[0060] Generally, after the UE successfully detects the initial signal, it needs to listen to one or more types of PDCCHs to obtain the COT. These one or more types of PDCCHs can be configured through a search space set. The COT includes the duration for which the base station occupies the channel (such as a few milliseconds, or several time slots, etc.), the format of the time slots within the duration (such as the configuration of uplink, downlink, and flexible symbols), the available LBT sub-bands within the duration (the basic unit of LBT, for example, a 20 MHz bandwidth). The LBT sub-band can also be called a channel, or a sub-channel, or an LBT sub-band, or an LBT bandwidth, or an RB set.

[0061] In the prior art, when the UE is in the idle state, the UE essentially cannot know whether the channel is available.

[0062] The embodiments of the present invention provide a data reception method, including: detecting a downlink signal within a fixed frame period; if the downlink signal is successfully detected within the fixed frame period, determining that uplink transmission or downlink reception can be performed within the fixed frame period, including: if a GC-PDCCH is detected within the fixed frame period, determining that uplink transmission or downlink reception can be performed within the fixed frame period. Through the technical solution provided by the embodiments of the present invention, by introducing a GD-PDCCH in the idle state, the UE in the idle state can know whether the channel is available, which is beneficial to improving the success probability of the UE obtaining the channel occupancy in the unlicensed band.

[0063] To make the above objects, features, and beneficial effects of the present invention more obvious and understandable, the following detailed description will be given to the specific embodiments of the present invention with reference to the accompanying drawings.

[0064] The technical solution provided by the embodiments of the present invention is applicable to 5G communication systems, and is also applicable to 4G and 3G communication systems, and is also applicable to various subsequent evolved communication systems.

[0065] The technical solution provided by the embodiments of the present invention is also applicable to different network architectures, including but not limited to relay network architectures, dual-link network architectures, and vehicle-to-everything (V2X) communication architectures.

[0066] The base station (BS) in the embodiments of the present invention, also referred to as base station equipment, is a device deployed in a radio access network to provide wireless communication functions. For example, the devices providing base station functions in a 2G network include a base transceiver station (BTS) and a base station controller (BSC). The devices providing base station functions in a 3G network include a Node B and a radio network controller (RNC). The devices providing base station functions in a 4G network include an evolved Node B (eNB). In a wireless local area network (WLAN), the device providing base station functions is an access point (AP). In 5G New Radio (NR), the device providing base station functions includes a further evolved Node B (gNB), and the base station also refers to the device providing base station functions in future new communication systems, etc.

[0067] The terminal in the embodiments of the present invention (e.g., a transmitting terminal and / or a receiving terminal) may refer to various forms of user equipment (UE), access terminal, user unit, user station, mobile station (MS), remote station, remote terminal, mobile device, user terminal, terminal equipment, wireless communication device, user agent or user device. The terminal equipment may also be a cellular phone, cordless phone, Session Initiation Protocol (SIP) phone, Wireless Local Loop (WLL) station, Personal Digital Assistant (PDA), handheld device with wireless communication function, computing device or other processing devices connected to a wireless modem, vehicle-mounted device, wearable device, terminal equipment in a future 5G network or terminal equipment in a future evolved Public Land Mobile Network (PLMN), etc. The embodiments of the present invention are not limited thereto.

[0068] It should be understood that the term "and / or" in this article is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article indicates that the associated objects before and after are in an "or" relationship.

[0069] The term "a plurality of" appearing in the embodiments of the present invention refers to two or more.

[0070] The term "connection" appearing in the embodiments of the present invention refers to various connection methods such as direct connection or indirect connection to achieve communication between devices. The embodiments of the present invention do not make any limitations thereto.

[0071] Figure 1 FIG. is a schematic flow chart of a data receiving method according to an embodiment of the present invention. The data receiving method may be executed by a UE, for example, by an NR UE. Specifically, the data receiving method may include the following steps:

[0072] Step S101, detecting a downlink signal within a fixed frame period;

[0073] Step S102, if the downlink signal is successfully detected within the fixed frame period, it is determined that uplink transmission or downlink reception can be performed within the fixed frame period.

[0074] For frame-based equipment (FBE) operation, generally, the base station performs LBT during a certain period at the end of the fixed frame period (FFP) to obtain channel occupancy within the fixed frame period. When the UE does not detect the GC-PDCCH, the UE can still obtain the channel occupancy situation by detecting the downlink signals (including downlink channels) within the fixed frame period.

[0075] When the UE and the network-side base station use the unlicensed band for data transmission and reception, to save UE power consumption, the base station can perform LBT.

[0076] When the base station performs LBT during a certain period at the end of the fixed frame period (FFP) and obtains channel occupancy, the base station can send the channel occupancy-related information to the UE.

[0077] In step S101, the UE can detect the downlink signal within the FFP. In a specific implementation, the UE can detect the downlink signal within the FFP of the unlicensed band. If the UE successfully detects the GC-PDCCH at the beginning of the FFP, it can obtain the relevant information about the base station occupying the channel from the downlink control information.

[0078] In one embodiment, the downlink signal refers to the downlink control signal. In another embodiment, the downlink signal may include one or more of the following: PDCCH signal, SSB, PBCH signal.

[0079] In step S102, if the UE successfully detects the downlink signal within the fixed frame period, the UE determines that uplink transmission (also known as uplink sending) or downlink reception can be performed within the fixed frame period.

[0080] The UE's determination that uplink transmission or downlink reception can be performed within the fixed frame period is equivalent to confirming that the base station has obtained channel occupancy and shared it with the UE.

[0081] In one embodiment, if the GC-PDCCH is not detected within the fixed frame period, but other downlink signals other than the GC-PDCCH are successfully detected, the UE can determine that uplink transmission or downlink reception can be performed within the fixed frame period. The UE's determination that uplink transmission or downlink reception can be performed within the fixed frame period is equivalent to confirming that the base station has obtained channel occupancy and shared it with the UE.

[0082] Among them, the uplink transmission may include one or more of the following: Physical Uplink Control Channel (PUCCH) transmission, Configured Grant Physical Uplink Shared Channel (CG-PUSCH), Periodic Sounding Reference Signal (SRS), semi-persistent SRS, Physical Random Access Channel (PRACH), autonomous uplink transmission. The uplink transmission is not limited to the above situations and may include other configured or periodic uplink transmissions.

[0083] The downlink reception may at least include one or more of the following: Channel State Information Reference Signal (CSI-RS) reception or Semi-Persistent Scheduling PDSCH (SPS-PDSCH) reception. The downlink reception is not limited to the above situations and may include other configured or periodic downlink receptions.

[0084] In a specific implementation, the UE uses high-priority channel sensing before uplink transmission; or, the UE uses high-priority channel assessment before uplink transmission; or, the UE uses high-priority LBT before uplink transmission; or, the UE uses the highest-priority channel sensing or the highest-priority channel assessment or the highest-priority LBT before uplink transmission. This can increase the probability of the UE's uplink transmission.

[0085] In a specific implementation, the UE determines that it can perform uplink transmission within the fixed frame period, which means performing uplink transmission when the channel is sensed idle for the first duration or performing uplink transmission without sensing the channel. Among them, the first duration refers to the duration with a relatively small parameter value among multiple durations. For example, the parameter values are 9 microseconds, 16 microseconds, or 25 microseconds. The first duration can be 9 microseconds or 16 microseconds.

[0086] In a specific implementation, the UE selects a relatively short channel sensing duration for channel sensing or channel assessment or LBT before uplink transmission. Or, the UE does not perform channel sensing or channel assessment or LBT before uplink transmission. This can increase the probability of the UE's uplink transmission.

[0087] In a specific embodiment, if the time interval (gap) between the uplink transmission and the downlink transmission burst (of the base station) is less than or equal to T1 microseconds, the UE may perform the uplink transmission without listening to the channel. Generally, T1 may be 16.

[0088] In a specific embodiment, if the time interval between the uplink transmission and the downlink transmission burst (of the base station) is greater than T1 microseconds, and the UE listens to the channel as idle within a duration of T2 microseconds, the UE may perform the uplink transmission without listening to the channel. Generally, T1 may be 16 and T2 may be 9.

[0089] In a specific implementation, assuming that the downlink signal is PDCCH, under this condition, the bandwidth of the downlink reception is located within the LBT bandwidth (bandwidth) or LBT sub-band where the PDCCH is located; or, the bandwidth of the downlink reception is located within the LBT bandwidth or LBT sub-band of the control resource set to which the PDCCH belongs.

[0090] In a specific implementation, the downlink signal is PDCCH, and the Cyclic Redundancy Check (CRC) of the PDCCH may be scrambled using a Cell-Radio Network Temporary Identity (C-RNTI), a System Information RNTI (SI-RNTI), a paging RNTI (P-RNTI), a Random Access RNTI (RA-RNTI), a TC-RNTI (Temporary C-RNTI), etc. It should be noted that successfully detecting the PDCCH means that the CRC check of the PDCCH passes.

[0091] In one embodiment, the PDCCH may be a PDCCH carrying a paging indication. The paging indicator is used to trigger one or a group of UEs to listen to the paging PDCCH at the current paging occasion (PO) or a subsequent PO. The subsequent PO may be understood as the nearest PO after the current moment. The subsequent PO may also be understood as any PO after the current moment.

[0092] In one embodiment, the downlink signal is a paging PDCCH or an OSI PDCCH, and the number of monitoring occasions of the paging PDCCH or the number of monitoring occasions of the OSI PDCCH is S. Herein, S is the number of SSBs actually transmitted as indicated by the base station, or S is the number of SSBs within a subset of the set of SSBs actually transmitted as indicated by the base station, and S is an integer. The subset of the set of actually transmitted SSBs may be a set formed by non-Quasi Co-Located (i.e., non-QCLed) SSBs.

[0093] Those skilled in the art understand that SSBs have a Quasi Co-Located (QCL) relationship within or between transmission windows, and non-QCLed SSBs form a subset.

[0094] In a specific implementation, the start time of the uplink transmission may have a time interval from the start time of the fixed frame period; or the start time of the downlink reception may have a time interval from the start time of the fixed frame period. Herein, the time interval is predefined or configured by the base station.

[0095] In a specific implementation, the start time of the uplink transmission may have a time interval from the first GC-PDCCH; or the start time of the downlink reception may have a time interval from the first GC-PDCCH. Herein, the first GC-PDCCH refers to the GC-PDCCH closest to the start time of the uplink transmission. Herein, the time interval is predefined or configured by the base station.

[0096] In one embodiment, the downlink signal is an SSB, and the bandwidth of the downlink reception is within the LBT bandwidth or LBT sub-band where the SSB is located; or the bandwidth of the downlink reception is within the LBT bandwidth or LBT sub-band of the BandwidthPart (BWP) to which the SSB belongs. The BWP to which the SSB belongs may be the initial active downlink BWP or the BWP with a BWP identity (ID) of 0 (BWP 0). In a specific implementation, successfully detecting an SSB means that the UE can determine that the base station has sent the SSB.

[0097] In one embodiment, the downlink signal is the PBCH, and the bandwidth of the downlink reception is within the LBT bandwidth or LBT sub-band where the PBCH is located; or, the bandwidth of the downlink reception is within the LBT bandwidth or LBT sub-band of the bandwidth part to which the PBCH belongs. The bandwidth part to which the SSB belongs may be the initial active downlink BWP (initial active DL BWP) or the BWP with BWP ID 0 (BWP 0). In a specific implementation, successfully detecting the PBCH means passing the CRC check of the PBCH.

[0098] In a specific implementation, the downlink signal may be the SSB or the PBCH, and the number of monitored SSBs or PBCHs is S; where S is the number of actually transmitted SSBs indicated by the base station, or S is the number of SSBs within the subset of the set of actually transmitted SSBs indicated by the base station, and S is an integer. The subset of the set of actually transmitted SSBs may be a set formed by non-quasi co-located SSBs.

[0099] Furthermore, when the PBCH is successfully detected, the UE may use the SSB where the PBCH is located as a measurement sample for radio resource management measurement and / or radio link monitoring measurement. In other words, when the UE decodes the PBCH or SSB, it can obtain channel quality information, and thus can use the SSB where the PBCH is located as a measurement result. When the PBCH is successfully detected, the UE may use the SSB where the PBCH is located as a synchronization sample for measurement, used to indicate In-sync.

[0100] In one embodiment, assume that the base station can send the GC-PDCCH in the idle state. If the GC-PDCCH in the idle state is detected within the fixed frame period, the idle state UE can determine that it can perform uplink transmission or downlink reception within the fixed frame period.

[0101] In a specific implementation, the configuration information of the GC-PDCCH in the idle state is carried by SIB1. The control resource set associated with the GC-PDCCH in the idle state may default to CORESET0. The GC-PDCCH in the idle state may carry a paging indication.

[0102] In a specific implementation, when the FFP corresponding to the GC-PDCCH in the idle state includes a paging occasion (PO for short), a paging PDCCH monitoring occasion, or a signal / channel related to the RACH process of transmission / reception (including signals / channels related to Msg-1, Msg-2, Msg-3, and Msg-4), the UE needs to monitor the GC-PDCCH in the idle state. Generally, the channel associated with Msg-1 can be the PRACH, the channel associated with Msg-2 can be the Random Access Response PDCCH and / or the RAR PDSCH, the channel associated with Msg-3 can be the PUSCH and / or the PUCCH, and the channel associated with Msg-4 can be the PDCCH and / or the PDSCH.

[0103] The following is elaborated in detail with specific embodiments, aiming to determine whether uplink transmission or downlink reception can occur by detecting downlink signals.

[0104] In a specific implementation, the uplink transmission can at least include transmitting the PUCCH, CG-PUSCH, periodic SRS, semi-persistent scheduled SRS, PRACH, or autonomous uplink transmission. The downlink reception can at least include receiving the CSI-RS or SPS PDSCH.

[0105] In a specific implementation, generally, when the UE is in the CONNECTED state, the base station configures the GC-PDCCH for the UE at the beginning of the FFP. Once the UE detects the GC-PDCCH at the beginning of the FFP, it can obtain the information about the channels occupied by the base station from the downlink control information. If the UE does not detect the GC-PDCCH or the base station does not configure the GC-PDCCH, then when the UE detects other downlink signals other than the GC-PDCCH, the following embodiments (Embodiment 1 or Embodiment 2) can be used for subsequent processing.

[0106] Embodiment 1

[0107] If a PDCCH is detected within the FFP, the UE can determine that uplink transmission or downlink reception can occur within the FFP. Generally, the UE is configured with PDCCHs that need to be monitored periodically. Even if the UE does not detect the GC-PDCCH or is not configured with the GC-PDCCH, the UE can still obtain the information about the channels in the current FFP occupied by the base station through the detected PDCCH.

[0108] The uplink transmission may occur, which may mean that the UE uses high-priority channel sensing or channel assessment or LBT before uplink transmission. The uplink transmission may also occur, which may mean that the UE uses the highest-priority channel sensing or channel assessment or LBT before uplink transmission. This can increase the probability of the UE's uplink transmission.

[0109] The uplink transmission may occur, which may mean that the UE selects a shorter listening channel duration for channel sensing or channel assessment or LBT. For example, the listening channel duration may be 16 microseconds (μs), 25 μs, etc. The listening channel duration may also be referred to as the Short Inter-Frame Space (SIFS). The uplink transmission may also occur, which may mean that the UE does not perform channel sensing or channel assessment or LBT. This can increase the probability of the UE's uplink transmission.

[0110] The downlink reception needs to satisfy that the downlink reception bandwidth is within the LBT bandwidth or LBT sub-band (also known as the LBT channel or LBT sub-channel) where the detected PDCCH is located. Alternatively, the downlink reception bandwidth is within the LBT bandwidth or LBT sub-band where the CORESET to which the detected PDCCH belongs is located.

[0111] Among them, the detected PDCCH refers to the CRC check of the PDCCH. The PDCCH may be scrambled with C-RNTI. In this case, the PDCCH is the scheduling PDCCH used by the base station for unicast services to the UE in the connected state. The PDCCH may also be scrambled with SI-RNTI or P-RNTI or RA-RNTI or TC-RNTI. In this case, the PDCCH is the scheduling PDCCH used by the base station for broadcast services to the UE. The broadcast services may include SIB1, SIBx, paging, Random Access Response (RAR), etc., where SIBx refers to other SIBs except SIB1.

[0112] In the prior art, it is usually assumed that in the unlicensed spectrum, for a given paging occasion, there are additional paging PDCCH listening occasions for the paging PDCCH, so as to expand from the original S listening occasions to S ·There are X paging PDCCH monitoring opportunities, where S is specified by the protocol, and both S and X are integers. However, in this embodiment, when the UE monitors the paging PDCCH, the UE can only monitor S paging PDCCH monitoring opportunities. Here, S is the number of actually transmitted SSBs indicated by the base station, or the number of SSBs within a subset of the set of actually transmitted SSBs indicated by the base station. This subset is a set composed of non-quasi-co-located SSBs. That is to say, when the UE monitors the paging PDCCH, the UE can assume that there are no additional PDCCH monitoring opportunities for the paging PDCCH, or the UE assumes that there is no shift or cyclic shift for the paging PDCCH. It should be noted that the paging PDCCH refers to the PDCCH scrambled with P-RNTI for the CRC.

[0113] When the UE monitors the OSI PDCCH, the UE can only monitor S PDCCH monitoring opportunities, where S is the number of actually transmitted SSBs indicated by the base station, or the number of SSBs within a subset of the set of actually transmitted SSBs indicated by the base station. This subset is a set composed of non-quasi-co-located SSBs. It should be noted that the OSI PDCCH refers to the PDCCH scrambled with SI-RNTI for the CRC.

[0114] Furthermore, there is a time gap or time offset between the start time of the uplink transmission or downlink reception and the start time of the FFP. Alternatively, there is a time gap or time offset between the start time of the uplink transmission or downlink reception and the nearest GC-PDCCH that the UE can monitor. The time gap or time offset is predefined or configured by the base station.

[0115] Embodiment 2

[0116] If an SSB or PBCH is detected within the FFP, the UE determines that uplink transmission or downlink reception can occur within the FFP. Usually, the SSB or PBCH is transmitted periodically, and the UE knows information such as the period of the SSB or PBCH. Therefore, even if the GC-PDCCH is not detected or the GC-PDCCH is not configured, the UE can obtain information that the base station has occupied the channel within the current FFP by detecting the SSB or PBCH.

[0117] That the uplink transmission can occur may mean that the UE uses high-priority channel sensing or channel assessment or LBT before uplink transmission. That the uplink transmission can occur may also mean that the UE uses the highest-priority channel sensing or channel assessment or LBT before uplink transmission. This can increase the probability of the UE's uplink transmission.

[0118] The uplink transmission may or may not occur, which may also mean that the UE selects a shorter listening channel duration for channel listening, channel evaluation, or LBT. For example, the listening channel duration may be 16 microseconds (μs), 25 μs, etc. The listening channel duration may also be referred to as the Short Inter-Frame Space (SIFS). The uplink transmission may or may not occur, which may also mean that the UE does not perform channel listening, channel evaluation, or LBT. This can increase the probability of the UE's uplink transmission.

[0119] The downlink reception needs to satisfy that the downlink reception bandwidth is within the LBT bandwidth (also known as the channel) where the detected SSB or PBCH is located, or the downlink reception bandwidth is within the LBT bandwidth where the bandwidth part (BWP) to which the detected SSB or PBCH belongs is located.

[0120] Among them, detecting an SSB means that the UE determines that the SSB has been sent by the base station. Detecting a PBCH means that the CRC check of the PBCH passes.

[0121] In the prior art, it is usually assumed that in the unlicensed spectrum, there are many candidate SSB positions, and the actually sent SSB is sent by the base station at the candidate SSB position during the channel occupancy period after obtaining the channel occupancy, that is, translation or cyclic shift. However, in the embodiments of the present invention, when the UE detects an SSB or PBCH, the UE only listens to S SSBs or PBCHs within S SSBs, where S is the number of actually sent SSBs indicated by the base station, or the number of SSBs within the subset of the set of actually sent SSBs indicated by the base station. This subset is a set composed of non-quasi co-located SSBs. That is to say, when the UE detects an SSB or PBCH, the UE can assume that the SSB or PBCH has no displacement or cyclic shift.

[0122] Furthermore, the UE can use the SSB where the detected PBCH is located as a measurement sample in RRM measurement and / or RLM measurement. The UE can use the SSB where the detected PBCH is located as a synchronization (In-Sync) sample in RLM measurement.

[0123] Furthermore, there may be a time interval or time offset between the start time of the uplink transmission and the start time of the FFP, and there may be a time interval or time offset between the start time of the downlink reception and the start time of the FFP. Or, there may be an interval or offset between the start time of the uplink transmission and the nearest GC-PDCCH listened to, and there may be an interval or offset between the start time of the downlink reception and the nearest GC-PDCCH listened to. Among them, the time interval or time offset is predefined or configured by the base station.

[0124] In a specific implementation, when the UE is in the idle state (IDLE) or the inactive state (INACTIVE), it is assumed that the base station cannot configure the GC-PDCCH in the idle state for the UE. Under this condition, if the UE in the idle state or the inactive state does not detect the GC-PDCCH or the base station does not configure the GC-PDCCH, then when the UE detects other downlink signals other than the GC-PDCCH, the following embodiments (Embodiment 3 or Embodiment 4) can be used for subsequent processing.

[0125] Embodiment 3

[0126] If a PDCCH is detected within the FFP, the UE can determine that uplink transmission or downlink reception can occur within the FFP. For specific details, reference can be made to Embodiment 1.

[0127] Since the UE is in the idle state or the inactive state, the PDCCH can be scrambled with SI-RNTI or P-RNTI or RA-RNTI or TC-RNTI, and this PDCCH is the scheduling PDCCH used by the base station for broadcasting services to the UE. Among them, the broadcasting services can include SIB1, SIBx, paging, random access response, etc. In addition, the PDCCH can also be a PDCCH carrying a Paging Indicator. Generally, the paging indicator triggers one or a group of UEs to monitor the paging PDCCH on the current or subsequent POs. The paging indicator PDCCH is an optimized way of paging, which can further group the UEs listening to the same PO, thereby reducing the false alert probability.

[0128] Embodiment 4

[0129] If an SSB or a PBCH is detected within the FFP, the UE determines that uplink transmission or downlink reception can occur within the FFP. For specific details, reference can be made to Embodiment 2.

[0130] In a specific implementation, when the UE is in the idle state (IDLE) or the inactive state (INACTIVE), it is assumed that the base station can configure the GC-PDCCH in the idle state for the UE. Under this condition, the UE can perform subsequent processing through the following embodiment (Embodiment 5).

[0131] Embodiment 5

[0132] If the GC-PDCCH in the idle state is detected within the FFP, the UE determines that uplink transmission or downlink reception can occur within the FFP. In a specific implementation, the UE can obtain the configuration information of the GC-PDCCH in the idle state through SIB1 information. The CORESET associated with the GC-PDCCH in the idle state can default to CORESET0. The GC-PDCCH in the idle state can carry a paging indication. The paging indication is used to trigger one or a group of UEs to listen for the paging PDCCH or the PDCCH scrambled by the P-RNTI on the current or subsequent POs. When the FFP corresponding to the GC-PDCCH in the idle state contains a paging occasion or a paging PDCCH listening occasion or a signal / channel related to the RACH procedure (including signals / channels related to Msg-1, Msg-2, Msg-3, and Msg-4), the UE needs to listen for the GC-PDCCH in the idle state. Generally, the channel associated with Msg-1 can be the PRACH, the channel associated with Msg-2 can be the RAR PDCCH and / or the RAR PDSCH, the channel associated with Msg-2 can be the PUSCH and / or the PUCCH, and the channel associated with Msg-4 can be the PDCCH and / or the PDSCH.

[0133] In summary, when the UE fails to detect the GC-PDCCH in the FFP or the base station does not configure the GC-PDCCH for the UE, if the UE receives other downlink signals in this FFP, the embodiments of the present invention allow the UE to determine whether uplink transmission or downlink reception can occur based on the received other downlink signals, providing a feasible technical solution for the UE to perform subsequent data transmission and reception. In addition, when the UE is in the idle state or the inactive state, if the UE receives the idle-state GC-PDCCH in this FFP, the UE can still determine whether uplink transmission or downlink reception can occur, providing a possibility for the UE to obtain the LBT bandwidth with a higher probability.

[0134] Figure 2 It is a schematic structural diagram of a data receiving device according to an embodiment of the present invention. The data receiving device 2 can implement Figure 1 the method technical solution shown and is executed by the UE. Specifically, the data receiving device 2 can include: a detection module 21, configured to detect downlink signals within a fixed frame period; a determination module 22, if the downlink signals are successfully detected within the fixed frame period, the determination module 22 is configured to determine that uplink transmission or downlink reception can be performed within the fixed frame period.

[0135] For more content about the working principle and working mode of the data receiving device 2, reference can be made to the relevant description in the above Figure 1 and will not be elaborated here.

[0136] It should be understood that in the embodiments of the present invention, the processor may be a central processing unit (CPU for short), and the processor may also be other general-purpose processors, digital signal processors (DSP for short), application specific integrated circuits (ASIC for short), field programmable gate arrays (FPGA for short), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0137] It should also be understood that the memory in the embodiments of the present invention may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM for short), a programmable read-only memory (PROM for short), an erasable programmable read-only memory (EPROM for short), an electrically erasable programmable read-only memory (EEPROM for short), or a flash memory. The volatile memory may be a random access memory (RAM for short), which is used as an external cache. By way of example but not limitation, many forms of random access memory (RAM for short) are available, such as static random access memory (SRAM for short), dynamic random access memory (DRAM for short), synchronous dynamic random access memory (SDRAM for short), double data rate synchronous dynamic random access memory (DDR SDRAM for short), enhanced synchronous dynamic random access memory (ESDRAM for short), synchronous link dynamic random access memory (SLDRAM for short), and direct rambus random access memory (DR-RAM for short).

[0138] The above embodiments can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, the processes or functions described in the embodiments of the present invention are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (such as infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that contains one or more collections of available media. The available media can be magnetic media (such as floppy disks, hard disks, magnetic tapes), optical media (such as DVDs), or semiconductor media. The semiconductor media can be a solid-state drive.

[0139] It should be understood that in various embodiments of the present invention, the order numbers of the above processes do not imply the order of execution. The order of execution of each process should be determined by its function and internal logic and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0140] In several embodiments provided by the present invention, it should be understood that the disclosed methods, devices, and systems can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of devices or units can be in electrical, mechanical, or other forms.

[0141] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0142] In addition, in each embodiment of the present invention, the functional units can be integrated into one processing unit, or each unit can be physically separate, or two or more units can be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware, or in the form of a combination of hardware and software functional units.

[0143] The above-mentioned integrated units implemented in the form of software functional units can be stored in a computer-readable storage medium. The above-mentioned software functional units stored in a storage medium include several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute some steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0144] Furthermore, an embodiment of the present invention also discloses a storage medium on which computer instructions are stored, and when the computer instructions run, they execute the above Figure 1 method technical solutions described in the illustrated embodiments. Preferably, the storage medium can include computer-readable storage media such as non-volatile memory or non-transitory memory. The computer-readable storage medium can include ROM, RAM, magnetic disks, or optical discs, etc.

[0145] Furthermore, an embodiment of the present invention also discloses a terminal, including a memory and a processor. The memory stores computer instructions that can run on the processor, and when the processor runs the computer instructions, it executes the above Figure 1 method technical solutions described in the illustrated embodiments. Preferably, the terminal can be an NR UE.

[0146] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. A data receiving method, characterized in that, it includes: detecting a downlink signal within a fixed frame period; if the downlink signal is successfully detected within the fixed frame period, it is determined that uplink transmission or downlink reception can be performed within the fixed frame period, where the downlink signal is PDCCH, and the PDCCH includes at least one of the following: PDCCH carrying a paging indication, paging PDCCH.

2. The data receiving method according to claim 1, characterized in that, the uplink transmission includes one or more of the following: PUCCH transmission, CG-PUSCH transmission, periodic SRS transmission, semi-persistent SRS transmission, PRACH transmission, autonomous uplink transmission.

3. The data receiving method according to claim 1, characterized in that, the downlink reception includes one or more of the following: CSI-RS reception, semi-persistent scheduled PDSCH reception.

4. The data receiving method according to any one of claims 1 to 3, characterized in that, the determination that uplink transmission can be performed within the fixed frame period refers to using high-priority channel sensing or high-priority channel evaluation or high-priority LBT before uplink transmission.

5. The data receiving method according to any one of claims 1 to 3, characterized in that, the determination that uplink transmission can be performed within the fixed frame period refers to performing uplink transmission when the channel is sensed idle for a first duration or performing uplink transmission without sensing the channel.

6. The data receiving method according to claim 1, characterized in that, the bandwidth of the downlink reception is within the LBT bandwidth or LBT sub-band where the PDCCH is located; or, the bandwidth of the downlink reception is within the LBT bandwidth or LBT sub-band of the control resource set to which the PDCCH belongs.

7. The data receiving method according to claim 1, characterized in that, the start time of the uplink transmission has a time interval from the start time of the fixed frame period; or, the start time of the downlink reception has a time interval from the start time of the fixed frame period.

8. The data receiving method according to claim 7, characterized in that, the time interval is predefined or configured by the base station.

9. The data receiving method according to claim 1, characterized in that, the successful detection of the downlink signal refers to passing the CRC check of the PDCCH.

10. A data receiving device, characterized in that, it includes: a detection module for detecting a downlink signal within a fixed frame period; a determination module, if the downlink signal is successfully detected within the fixed frame period, the determination module is used to determine that uplink transmission or downlink reception can be performed within the fixed frame period, where the downlink signal is PDCCH, and the PDCCH includes at least one of the following: PDCCH carrying a paging indication, paging PDCCH.

11. A storage medium, on which computer instructions are stored, characterized in that, when the computer instructions are run by a processor, the steps of the method according to any one of claims 1 to 9 are executed.

12. A terminal, comprising a memory and a processor, where computer instructions that can run on the processor are stored on the memory, characterized in that, when the processor runs the computer instructions, it executes the steps of the method according to any one of claims 1 to 9.

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