A method, apparatus and device for information transmission

Abstract

Embodiments of the present invention disclose a method, apparatus, and device for information transmission. Among them, the method includes: the device performs information transmission on configured resources. Embodiments of the present invention propose a continuous downlink / uplink transmission mode and an uplink / downlink channel / signal transmission mode in the case of multiple switching points.

Description

Technical Field

[0001] This application relates to, but is not limited to, the field of communications, and in particular to a method, apparatus, and device for information transmission. Background Art

[0002] At the 75th plenary session of the RAN (Radio Access Network), a new research topic was established: NR (New Radio) assisted access to unlicensed carriers. This topic aims to study how to complete the NR work deployment on unlicensed spectrum.

[0003] According to the regulatory requirements in the ETSI (European Telecommunications Standards Institute), before transmitting on unlicensed spectrum, a device needs to perform an LBT (Listen Before Talk). If the LBT detects that the channel is idle, the device is allowed to use the channel within the MCOT (Maximum Channel Occupancy Time). Here, before initiating an MCOT, the device performs a new extended CCA (Clear Channel Assessment), for example, Cat4 LBT (Category 4 Listen Before Talk). In LAA (Licensed Assisted Access) LTE (Long Term Evolution), the standard already supports the base station to initiate an MCOT, and within this MCOT, it can only be shared with the UE (User Equipment) that receives downlink data from the base station. That is to say, only the D+U (Downlink+Uplink) structure within the MCOT is supported, and one downlink and uplink handover point situation is supported. Among them, the base station initiates the MCOT and uses the Cat4 LBT mechanism, while the UE sharing the MCOT only needs to perform the Cat2 LBT mechanism before uplink transmission.

[0004] Furthermore, in LAA LTE, the device performs LBT detection and transmission in an omnidirectional mode. In NR, however, high frequency is a very important scenario, and the device performs transmission in a directional beam mode. This means that if the omnidirectional LBT mechanism in the LAA LTE phase is continued to be used, it cannot accurately reflect the interference level within the range of the directional transmission beam, resulting in a reduced channel access probability. On the other hand, if the device follows the omnidirectional LBT mechanism but uses the directional beam mode for transmission and does not perform LBT before continuously transmitting in different corresponding directional beam directions, it may occur that the interference in the switched beam direction is very strong and leads to transmission failure, because the channel in the switched directional beam direction is pre-reserved or occupied by this device before switching the beam direction. Finally, for the case where the corresponding directional beam directions for continuous transmission are the same, even if the device has detected that the channel corresponding to this directional beam direction is idle before continuous transmission, due to the different interference fluctuations of the channel at different times, this will also cause a large interference impact on the transmission using the previously detected idle beam direction for continuous transmission resources and lead to transmission failure. To address these problems, a channel access method for continuous transmission resources using the same directional beam and different directional beams needs to be provided.

[0005] In addition, at the 3GPP (3rd Generation Partnership Project) RAN1#92bis meeting, a consensus was reached on the case of supporting more than one transition point within a TxOP (Transmission Opportunity) or MCOT. Therefore, it is necessary to study the channel access method for uplink and downlink channel / signal transmission in the case of multiple transition points, and to study the channel access method for the case where the terminal UE initiates an MCOT, for example, the sharing situation with different UEs. Summary of the Invention

[0006] Embodiments of the present invention provide a method, apparatus, and device for information transmission.

[0007] Embodiments of the present invention provide a method for information transmission, including:

[0008] The device performs information transmission on the configured resources.

[0009] Embodiments of the present invention further provide an apparatus for information transmission, including:

[0010] A transmission module, configured to perform information transmission on the configured resources.

[0011] An embodiment of the present invention further provides a device for information transmission, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the method for information transmission is implemented.

[0012] Other features and advantages of the present invention will be described in the following specification, and in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures specifically pointed out in the specification, claims, and drawings. Description of the Drawings

[0013] The drawings are used to provide a further understanding of the technical solution of the present invention, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention, and do not constitute a limitation to the technical solution of the present invention.

[0014] Figure 1 It is a flowchart of the method for information transmission according to an embodiment of the present invention;

[0015] Figure 2 It is a schematic diagram of the channel access mode and transmission mode of the base station / UE in the case of continuous transmission according to an embodiment of the present invention;

[0016] Figure 3 It is a schematic diagram of the channel access mode of the base station / UE by dynamic indication in the case of continuous transmission according to an embodiment of the present invention;

[0017] Figure 4 It is a schematic diagram of the channel access mode adopted for transmission in different directional beam directions in the case of continuous transmission according to an embodiment of the present invention;

[0018] Figure 5 It is a schematic diagram of the transmission mode with the beam direction sequentially from P to Q beam directions on the continuous transmission resource according to an embodiment of the present invention;

[0019] Figure 6 It is a schematic diagram of the decreasing trend of the number of beam directions for transmission on the continuous transmission resource and the indication of the LBT operation by dynamic signaling according to an embodiment of the present invention;

[0020] Figure 7 It is a schematic diagram of a case where the device simultaneously transmits on the detected idle beam direction according to an embodiment of the present invention;

[0021] Figure 8 It is a schematic diagram of the channel access mechanism in the case of multiple handover points within one MCOT according to an embodiment of the present invention;

[0022] Figure 9Channel access schematic diagram when different UEs in an embodiment of the present invention share one MCOT Figure 1 ;

[0023] Figure 10 It is a channel access schematic diagram when different UEs in an embodiment of the present invention share one MCOT Figure 2 ;

[0024] Figure 11 Channel access schematic diagram when different UEs in an embodiment of the present invention cannot share one MCOT Figure 1 ;

[0025] Figure 12 It is a channel access schematic diagram when different UEs in an embodiment of the present invention cannot share one MCOT Figure 2 ;

[0026] Figure 13 Schematic diagram of the LBT method based on BWP / Subband in an embodiment of the present invention;

[0027] Figure 14 Schematic diagram of spatial multiplexing / reuse of different UEs in an embodiment of the present invention;

[0028] Figure 15 Schematic diagram of the device for information transmission in an embodiment of the present invention. Detailed implementation manners

[0029] In the following, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0030] The steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. And, although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0031] As Figure 1 shown, an embodiment of the present invention provides a method for information transmission, including:

[0032] Step 101, the device performs information transmission on the configured resources.

[0033] In one embodiment, before the device performs information transmission on the configured resources, it further includes:

[0034] The device performs idle channel detection according to at least one of a specific LBT mechanism and a specific LBT mode.

[0035] In one embodiment, the device performing information transmission on the configured resources includes:

[0036] The device performs transmission using the same beam direction on the configured resources.

[0037] In one embodiment, the device performs information transmission using the same beam direction on the configured resources, including:

[0038] The device detects that the channel is idle on resource n and performs information transmission using beam direction i. On resource n + 1 or subsequent configured resources, the device may not perform idle channel detection, and / or perform information transmission using beam direction i.

[0039] In one embodiment, the device performs information transmission on the configured resources, including:

[0040] The beam direction used by the device on the configured resources is switched, or transmission is performed using different beam directions.

[0041] In one embodiment, the beam direction used by the device on the configured resources is switched, or transmission is performed using different beam directions, including:

[0042] Before the resources corresponding to the switched beam direction, the device performs idle channel detection according to at least one of a specific LBT mechanism and a specific LBT mode;

[0043] If the channel is detected to be idle, the device performs transmission using the switched beam direction on the configured resources.

[0044] In one embodiment, before the device performs information transmission on the configured resources, it includes:

[0045] The device performs idle channel detection using LBT based on a single beam direction;

[0046] If the channel is detected to be idle, the device performs transmission using the beam direction in which the channel is detected to be idle on the configured resources.

[0047] In one embodiment, before the device performs information transmission on the configured resources, it includes:

[0048] For the case where the device performs idle channel detection using LBT based on a single beam direction:

[0049] If the channel is detected to be busy, the device abandons transmission on the current resources; or,

[0050] If the channel is detected to be busy, the device continues to perform idle channel detection in accordance with at least one of the previous LBT modes and LBT mechanisms before the next possible transmission start position; or,

[0051] If the channel is detected to be busy, the device changes at least one of the Beam beam direction for performing LBT and the LBT mechanism and LBT mode, and retries idle channel detection; or

[0052] If the channel is detected to be busy, the device performs idle channel detection using a simplified LBT mechanism compared to the previous time, or uses a fast LBT mechanism for idle channel detection.

[0053] In one embodiment, before the device transmits information on the configured resources, it includes:

[0054] For the case where the device performs idle channel detection using LBT based on multiple Beam directions:

[0055] If a beam direction with an idle channel is detected, the device transmits on the configured resources using the beam direction with the detected idle channel; or,

[0056] If the detected beam with an idle channel includes the corresponding beam direction on the configured resources, transmit according to the corresponding beam direction on the configured resources; or,

[0057] If the number of detected beam directions with an idle channel is not less than 1, transmit simultaneously on the configured resources using the beam directions with the detected idle channels; or,

[0058] If the number of detected beam directions with an idle channel is not less than 1, select one beam direction according to a specific rule for transmission in the beam directions with the detected idle channels.

[0059] In one embodiment, before the device transmits information on the configured resources, it includes:

[0060] For the case where the device performs idle channel detection using LBT based on multiple Beam directions:

[0061] If the channel is detected to be busy, the device abandons transmission on the current resources; or,

[0062] If the channel is detected to be busy, the device continues to perform idle channel detection in accordance with at least one of the previous LBT modes and LBT mechanisms before the next possible transmission start position; or,

[0063] If the channel is detected to be busy, the device changes the Beam direction for performing LBT and retries the idle channel detection; or,

[0064] If the channel is detected to be busy, the device performs idle channel detection in multiple beam directions before the next possible transmission start position using a simplified LBT mechanism or a fast LBT mechanism compared to the previous time.

[0065] In one embodiment, the device performs information transmission on the configured resources, including:

[0066] The device performs transmission in multiple beam directions on the configured resources, or the device performs idle channel detection using multi-beam based LBT on the configured resources. The beam direction used by the device for information transmission on the current resources includes at least one of the transmission beam directions in the subsequent resources, or the number of beam directions for simultaneous transmission using multiple beam directions shows a decreasing trend in the order of increasing resource index.

[0067] In one embodiment, the method further includes:

[0068] During information transmission on the configured resources, if the device receives dynamic indication signaling, the device needs to perform idle channel detection.

[0069] In one embodiment, the dynamic indication signaling includes at least one of the following information:

[0070] Trigger to perform idle channel detection, indication of the LBT mechanism, indication of the LBT mode, timing relationship between the trigger signaling position and the resources for performing idle channel detection / transmission, starting position of LBT, number of symbols occupied by LBT; subcarrier spacing SCS, beam direction, indication of whether beam switching is supported, indication of whether partial symbols are supported, candidate data transmission start points or sets, priority level for performing LBT, at least one parameter in the parameter set corresponding to the LBT mechanism.

[0071] In one embodiment, before the device performs information transmission on the configured resources, it includes:

[0072] The device performs idle channel detection according to at least one of a specific LBT mechanism and a specific LBT mode, determines that the channel is idle, and initiates MCOT or TxOP.

[0073] In one embodiment, within the MCOT, at the handover point between uplink and downlink, or at the handover point between downlink and uplink within the MCOT, the device performs idle channel detection according to at least one of a specific rule, a specific LBT mechanism, and a specific LBT mode.

[0074] In one embodiment, the specific rules include at least one of the following:

[0075] When the gap between downlink and uplink, or between at least one of uplink and downlink, is not greater than a first threshold, the device may perform idle channel detection without executing the LBT mechanism;

[0076] When the gap between downlink and uplink, or between at least one of uplink and downlink, is less than a second threshold, or is not less than the first threshold and not greater than the second threshold, the device executes Cat2 LBT, or the M - time Cat2 LBT mechanism;

[0077] When the gap between downlink and uplink, or between at least one of uplink and downlink, is greater than the second threshold, the device executes the same LBT mechanism as when initiating MCOT, or a higher - priority - level LBT mechanism;

[0078] At the handover point between downlink and uplink, or between at least one of uplink and downlink, the device executes Cat2 LBT, or the M - time Cat2 LBT mechanism;

[0079] At the handover point between downlink and uplink, or between at least one of uplink and downlink, the device adopts the same LBT mechanism as when initiating MCOT;

[0080] At the handover point between downlink and uplink, or between at least one of uplink and downlink, the device adopts a higher - priority - level LBT mechanism than when initiating MCOT;

[0081] At the handover point between downlink and uplink, or between at least one of uplink and downlink, the device determines the LBT mechanism to be adopted according to the type of traffic transmitted, or the traffic type / channel / channel priority;

[0082] At the handover point between downlink and uplink, or between at least one of uplink and downlink, the device determines the LBT mechanism according to the time - domain / sub - frame / slot structure of the transmission;

[0083] When the number of times of executing the Cat2 LBT mechanism at the handover point between downlink and uplink, or between at least one of uplink and downlink, exceeds a specific threshold, at the next handover point, the device executes a specific LBT mechanism; when the number / index of handover points between downlink and uplink, or between at least one of uplink and downlink, is greater than a specific threshold, the device executes a specific LBT mechanism.

[0084] In one embodiment, at least one of the first threshold, second threshold, time domain / subframe / slot structure of the transmission, number of handover points, specific threshold, relationship between the time domain / subframe / slot structure of the transmission and the LBT mechanism / LBT mechanism priority level, gap duration, start position of the handover point, end position of the handover point, number of times of executing the Cat2 LBT mechanism, LBT mode, LBT mechanism, start position of the LBT, number of symbols occupied by the LBT, subcarrier spacing SCS, beam direction, beam handover indication, whether to support partial symbol indication, candidate data transmission starting point or set, LBT priority level, parameter set corresponding to the LBT mechanism, and M can be obtained through at least one of the following methods:

[0085] Predefined, physical layer DCI signaling, high layer RRC signaling, MAC signaling.

[0086] In one embodiment, the number of handover points, or the number of times of allowing the execution of Cat2 LBT within the MCOT, or M can also be obtained through at least one of the following:

[0087] Determined according to the MCOT / Txop duration;

[0088] According to the allowed gap duration within the MCOT / Txop;

[0089] Determined according to the number / structure of the scheduling units;

[0090] Determined according to the SCS;

[0091] According to the ratio between the MCOT / Txop duration and the gap.

[0092] In one embodiment, the specific LBT mode includes at least one of the following:

[0093] Omnidirectional LBT mode;

[0094] Multi-Beam direction LBT mode;

[0095] Wide beam direction LBT mode;

[0096] Single beam direction LBT mode.

[0097] In one embodiment, the specific LBT mechanism includes at least one of the following:

[0098] Cat4 LBT mechanism;

[0099] Cat2 LBT mechanism;

[0100] M times Cat2 LBT mechanism;

[0101] Higher-priority Cat4 LBT;

[0102] Cat3 LBT mechanism;

[0103] Cat4 LBT mechanism with random backoff value N;

[0104] LBT mechanism with defer period duration;

[0105] LBT mechanism in which at least one of the above mechanisms is scaled proportionally according to SCS;

[0106] Wherein, M and N are positive integers.

[0107] In one embodiment, different devices multiplex configured resources for transmission, including:

[0108] Different beam indices are used between different devices transmitting on the configured resources, or, idle channel assessment is performed simultaneously on multiple beam indices.

[0109] In one embodiment, it includes at least one of the following:

[0110] If different devices use the same beam index, the device performs idle detection of the channel in the beam direction according to at least one of the first detection threshold value and the second detection threshold value.

[0111] In one embodiment, different devices multiplex configured resources for transmission, including at least one of the following:

[0112] Before the device transmits on the configured resources, information interaction is performed.

[0113] In one embodiment, the information for interaction includes at least one of the following:

[0114] Beam index information, time-domain resource information, time-domain pattern, frequency-domain resource information, SCS, transmission structure of MCOT, subframe / slot structure, LBT mechanism, LBT position, LBT mode.

[0115] In the present invention, the LBT mode includes at least one of the following: omnidirectional LBT mode, multi-beam direction LBT mode, wide-beam direction LBT mode, and single-beam direction LBT mode. The LBT mode of multiple beam directions means that the multiple beam directions for performing LBT are the beam directions corresponding to continuous transmission, or the beam directions included within TxOP / MCOT. The wide-beam direction LBT mode means that the wide-beam direction covers / includes the beam directions corresponding to continuous transmission, or the beam directions included within TxOP / MCOT.

[0116] The LBT mechanism includes at least one of the following: Cat4 LBT mechanism, Cat2 LBT mechanism, M - time Cat2 LBT mechanism, Cat4 LBT mechanism with random backoff value N (excluding defer period), Cat4 LBT mechanism with random backoff value N (including defer period), LBT mechanism with defer period duration, and LBT mechanism scaled proportionally according to SCS for the above LBT mechanisms.

[0117] At least one of the M, N, LBT mechanism, SCS, LBT mode, LBT start position / candidate position, MCOT transmission structure, handover point position, and number of handovers is obtained through at least one of the following methods: predefined, physical layer DCI signaling, high layer RRC signaling, and MAC signaling.

[0118] The M - time Cat2 LBT can be the execution of the Cat2 LBT mechanism M times, or the Cat2 LBT mechanism where as long as one LBT is successful among the M times.

[0119] The dynamic signaling includes at least one of the following: physical layer DCI (Downlink Control Information) signaling, high layer RRC (Radio Resource Control) signaling, and MAC (Media Access Control) signaling.

[0120]

[0121] This embodiment provides a channel access method in the case of continuous downlink / uplink transmission.

[0122] For the case of using the same directional beam for downlink / uplink continuous transmission, the ways for the device to perform LBT include one of the following: LBT mechanism in a single beam direction, LBT mechanism in multiple beam directions, and LBT mechanism in a wide beam direction. If the channel is detected to be idle according to the LBT method, the device continues to transmit in the directional beam direction. As Figure 2 shown, Figure 2 FIG. is a schematic diagram of the channel access mode and transmission mode of the base station / UE in the case of continuous transmission. As can be seen from Figure 2 it, before the base station or UE transmits on the resources of continuous transmission, it adopts the Cat4 or Cat2 LBT mechanism in a single beam direction / multiple beam directions / wide beam direction. Before the continuous transmission or before initiating the MCOT, the base station / UE adopts the Cat4 LBT mechanism. If the continuous transmission of the base station / UE is within the MCOT, the base station / UE executes the Cat2 LBT mechanism before transmission.

[0123] In another case, based on the case of using the same directional beam for downlink / uplink continuous transmission, due to the different fluctuations of channel interference conditions at different times, in order to improve the success probability of transmission / reception, the base station / UE can be triggered by dynamic indication signaling to perform a channel idle condition judgment during continuous transmission, that is, execute an LBT mechanism. Optionally, the dynamic indication signaling can indicate at least one of triggering the execution of the LBT mechanism, the mode of executing the LBT, the starting position of the LBT, the position of the LBT mechanism, the LBT mechanism, the SCS, the beam direction, etc. To prevent the channel from being preempted midway, the base station / UE can execute a fast LBT mechanism, for example, the Cat2 LBT mechanism, or, M times of the Cat2 LBT mechanism, or, the Cat4 LBT mechanism with a random backoff value N (excluding the defer period), or, the Cat4 LBT mechanism with a random backoff value N (including the defer period), or, the LBT mechanism with the defer period duration, or, the LBT mechanism scaled proportionally according to the SCS such as the above LBT mechanism. As Figure 3 shown, Figure 3 FIG. is a schematic diagram of the channel access mode of the base station / UE by dynamic indication in the case of continuous transmission. As can be seen from Figure 3 it, the base station / UE executes the Cat2 LBT according to the dynamic signaling indication. If the dynamic signaling only triggers the execution of the LBT mechanism and does not notify the executed LBT mechanism, the Cat2 LBT is executed by default.

[0124] In another case, if different directional beams are used for downlink / uplink continuous transmission, or there is a directional beam switching during continuous transmission, then before continuous transmission, an LBT mechanism in the multi-beam direction / wide-beam direction / single directional beam direction is adopted. Further, before continuous transmission or before initiating MCOT, the base station / UE adopts the Cat4 LBT mechanism. If the continuous transmission of the base station / UE is within the MCOT, the base station / UE executes the Cat2 LBT mechanism before transmission.

[0125] If the base station / UE adopts the LBT mechanism in the single directional beam direction before MCOT or continuous transmission. If the channel is detected to be idle, the base station / UE starts transmission and transmits in the beam direction where the idle is detected. If there is a directional beam direction switching during continuous transmission, the base station / UE can execute a fast LBT mechanism. Optionally, for the case where there is no directional beam direction switching during continuous transmission, due to the different fluctuations of channel interference conditions at different times, in order to improve the success probability of transmission / reception, a fast LBT mechanism can be triggered for the base station / UE through dynamic indication signaling. Optionally, the dynamic indication signaling can indicate at least one of triggering the execution of the LBT mechanism, the mode of executing LBT, the starting position of LBT, the LBT mechanism position, the LBT mechanism, SCS, beam direction, etc. The fast LBT mechanism can be the Cat2 LBT mechanism, or the M - time Cat2 LBT mechanism, or the Cat4 LBT mechanism with a random backoff value N (excluding the defer period), or the Cat4 LBT mechanism with a random backoff value N (including the defer period), or the LBT mechanism with the defer period duration, or the LBT mechanism obtained by proportionally scaling the above LBT mechanisms according to SCS.

[0126] If the base station / UE adopts the LBT mechanism in multiple directional beam directions before MCOT or continuous transmission. If the channel is detected to be idle, transmission is carried out in the corresponding beam directions. Since the base station / UE transmits in the way of a single directional beam direction, even if the channel is detected to be idle in multiple beam directions before the start of transmission, the transmission is only carried out in a single directional beam direction, which may lead to the loss of the channel in the non - transmitted directional beam directions. Therefore, once there is a directional beam switching during continuous transmission, the base station / UE needs to execute a fast LBT mechanism. Other methods are the same as those already mentioned in this embodiment. Similarly, if the base station / UE adopts the LBT mechanism in the wide - beam direction before MCOT or continuous transmission, its processing method is the same as the corresponding processing method already mentioned in this embodiment.

[0127] Such as Figure 4As shown Figure 4 is a schematic diagram of a channel access method adopted for transmission in different directional beam directions in the case of continuous transmission. From Figure 4 it can be seen that the Cat2 LBT mechanism is executed before transmission in the switched directional beam direction, and, for the beam direction where no directional beam direction switching occurs, a LBT mechanism is executed according to the dynamic signaling indication, such as Cat2 LBT. If the dynamic signaling only triggers the execution of the LBT mechanism and does not notify the executed LBT mechanism, the Cat2 LBT is executed by default.

[0128] In another case, in order to reduce the number of LBT executions during continuous transmission or within MCOT, the base station / UE adopts a LBT mechanism for multiple directional beam directions / wide beam directions / omnidirectional before continuous transmission. If the channel is detected to be idle, during continuous transmission, the base station / UE adopts a simultaneous transmission method on the subsequent transmission beam directions in sequence to help pre-occupy the beam directions for subsequent transmission. The transmission information sent on the pre-occupied beam direction can be the same transmission information as that on the actual transmission beam direction, or, invalid information, or, indication information, or, reference / measurement signal, or, up / downlink channel / signal. As Figure 5 shown Figure 5 is a schematic diagram of a transmission method where the transmission beam directions on continuous transmission resources are from beam direction P to beam direction Q in sequence. P is the number of different beam directions among the subsequent transmission beams, and Q is the number of different beams of the transmission beams on the current resource and the subsequent resources. For example, if the continuous transmission resources are 5, and the corresponding beam directions on each resource are different, then on the first resource, the base station / UE transmits simultaneously in 5 beam directions, on the second resource, the base station / UE transmits simultaneously in 4 beam directions, and so on, and on the 5th resource, the base station / UE transmits in 1 beam direction. Optionally, on the continuous transmission resources, the base station / UE can indicate the LBT operation according to the dynamic signaling indication, as Figure 6 shown Figure 6 is a schematic diagram of the number of transmission beam directions on continuous transmission resources showing a decreasing trend and the LBT operation is indicated by dynamic signaling.

[0129] In another case, which is different from the previous one, before continuous transmission, the base station / UE adopts the LBT mechanism for multiple directional beam directions / wide beam directions / omnidirectional. If it is detected that the channel is idle on at least one of its beam directions, transmission is performed on the detected idle beam. Among them, for the cases where the beam directions for the previous and subsequent transmissions are the same, the beam direction of the previous transmission is used for transmission. For the cases where the beam directions for the previous and subsequent transmissions change, transmission may not be performed in the beam direction corresponding to the previous resource this time. Or, the previous transmission is only performed in the adjacent transmit beam directions. Before the next transmission, the base station / UE may perform the LBT mechanism in the beam direction corresponding to the current resource and / or at least one of the beam directions corresponding to the subsequent resources. If it is detected that the channel is busy in the beam direction corresponding to the next resource, the transmission in the beam direction corresponding to the next resource is abandoned, and transmission may be performed in the beam direction corresponding to the current resource. If an idle beam direction is detected in the subsequent beam directions, in addition to performing transmission in the corresponding beam direction on the next resource, the base station / UE may also perform transmission in at least one of the detected idle beam directions. If the transmission beam direction on the previous resource includes the transmission beam on the next or subsequent resource, the device may not perform LBT before the next resource. Or, perform a simplified LBT. Or, indicate the LBT operation according to dynamic signaling instructions.

[0130] Optionally, when using the LBT for multiple beam directions to detect the idle channel, the detected idle beam direction is the beam direction for activation or transmission on the subsequent resource.

[0131] As Figure 7 shown, Figure 7A schematic diagram for simultaneous transmission on the beam directions detected as idle by the device. Specifically, when the device transmits on 5 consecutive resources, and each resource corresponds to a different beam direction, the beam directions are sequentially labeled as beam#1, beam#2, beam#3, beam#4, and beam#5. Before transmitting on the continuously transmitted resources, the base station / UE performs channel idle detection using the LBT method for multiple beams. If the detected idle beam directions are beam#2, beam#3, and beam#4, the base station / UE transmits on the first resource using the three beam directions, and transmits on the second resource using beam#2 and beam#3. First case: Transmit on beam#3 on the third resource. Before transmitting on the 4th resource, the device can perform the LBT mechanism on beam#1 and / or beam#5. If it is detected that the channel is idle in at least one beam direction, the device transmits in at least one of the beam directions. Transmit on the beam direction detected as idle and not used previously on the 5th resource. Alternatively, before transmitting on the 4th resource, the device can perform the LBT mechanism on at least one of beam#1 to beam#5, and use the detected idle beam directions for subsequent resources. Optionally, the subsequent resource uses the beam direction not used by the previous resource for the previous resource. Second case: Before transmitting on the third resource, the base station / UE can perform the LBT mechanism on beam#1, and / or beam#3, and / or beam#5. If it is detected that the beam direction is idle, transmit on the detected idle beam direction on the third resource, and / or transmit on the corresponding beam#3 direction on the third resource. The subsequent resource uses the beam direction not used by the previous resource for the previous resource. And so on, if the number of beam directions for transmission on the current resource is no more than 2, and the current resource is not the second-to-last resource in the continuous transmission, then the method described in the second case needs to be used for processing.

[0132]

[0133] This embodiment gives a processing method in the case of detecting a busy channel.

[0134] If the base station / UE detects that the channel is busy, the base station / UE can perform at least one of the following operations:

[0135] Tips: Time-frequency-space + LBT mechanism method

[0136] A. Time domain + LBT + (beam directions in frequency domain and spatial domain remain unchanged):

[0137] Method 1: Before the next candidate start position, perform idle channel detection using the previous LBT mechanism method.

[0138] Method 2: Before the next candidate start position, use a simplified LBT mechanism compared to the previous one, or a fast LBT mechanism.

[0139] Method 3: Different from Method 1 and Method 2, the next candidate start position is replaced by the next resource.

[0140] Optionally, in Method 1 to Method 3, the previous beam direction can be adopted, or the previous LBT mode can be adopted, or the LBT mechanism is only executed in the transmission beam direction.

[0141] B. Frequency domain + LBT (beam direction unchanged)

[0142] Method 4: Switch to the detected idle frequency domain for transmission.

[0143] Method 5: Switch to other frequency domains and perform idle channel detection using the previous LBT mechanism method.

[0144] Method 6: Switch to other frequency domains and use a simplified LBT mechanism compared to the previous one, or a fast LBT mechanism.

[0145] C. Spatial domain + LBT (beam direction unchanged)

[0146] Method 7: Switch to the detected idle beam direction for transmission.

[0147] Method 8: Switch the beam direction and use the previous LBT mechanism in the switched beam direction.

[0148] Method 9: Switch the beam direction and use a simplified LBT mechanism compared to the previous one, or a fast LBT mechanism in the switched beam direction.

[0149] Method 10: Continue to execute the LBT mechanism until the LBT is successful.

[0150] Method 11: Use the previous LBT mechanism in multiple beam directions.

[0151] Method 12: Use a simplified LBT mechanism compared to the previous one, or a fast LBT mechanism in multiple beam directions.

[0152] Method 13: Determine whether the currently detected energy is greater than the first detection threshold and less than the second detection threshold, or whether the currently detected energy is less than the second detection threshold. If so, it is considered that the current channel is idle and the device can perform transmission.

[0153] Method Fourteen: A combination method of at least one of the above methods.

[0154] Optionally, in the above methods, if there are partial symbols, or partial (small) time slots, or partial sub - frames, the device can send data, or occupy signals, or reference signals, or indication signals, etc. on the above - mentioned partial symbols, or partial (small) time slots, or partial sub - frames.

[0155] Optionally, if the number of times the channel is busy when the previous LBT mechanism is executed is not less than the first preset number of times, a simplified LBT mechanism or a fast LBT mechanism compared with the previous one is adopted.

[0156] The first preset number of times can be determined according to statistical results, or in a predefined manner, indicated by physical layer DCI signaling, high - layer RRC signaling, or MAC signaling.

[0157] Among them, the frequency domain for handover is the frequency domain where the channel detection is idle. The frequency domain can be RB, or RBG, or RE, or REG, or BWP, or CC, or Subband, or CCG, or Subbandgroup.

[0158] The simplified LBT mechanism compared with the previous one is a more simplified LBT mechanism compared with the previous one from at least one of the aspects of parameter configuration in the LBT mechanism, the priority corresponding to the LBT mechanism, the detection duration corresponding to the parameters, the sub - carrier spacing SCS, the LBT mechanism, and the number of times the LBT mechanism is executed. The fast LBT mechanism can be a Cat2 LBT mechanism, an M - time Cat2 LBT mechanism, a Cat4 LBT mechanism with a random back - off value N (excluding the defer period), a Cat4 LBT mechanism with a random back - off value N (including the defer period), a LBT mechanism with a defer period duration, or one of the LBT mechanisms scaled proportionally according to SCS.

[0159] For example, if Cat4 LBT was used last time, currently, Cat4 LBT with a higher priority level, or Cat4 LBT with a smaller contention window / random backoff value N, or the Cat2 LBT mechanism, or the M - time Cat2 LBT mechanism, or the Cat4 LBT mechanism with a random backoff value N (excluding the defer period), or the Cat4 LBT mechanism with a random backoff value N (including the defer period), or the LBT mechanism with the defer period duration, or the LBT mechanism obtained by proportionally scaling the above - mentioned LBT mechanism according to SCS can be used. Another example is that if Cat2 LBT was used last time, currently, a Cat2 LBT mechanism with a shorter detection duration than the previous one, or the M - time Cat2 LBT mechanism, etc. can be used.

[0160]

[0161] This embodiment provides a channel access method for a base station / terminal UE to initiate the MCOT (Maximum Channel Occupancy Time) / TxOP (Transmission Opportunity) situation.

[0162] When a base station / UE initiates an MCOT / TxOP, it needs to execute a Cat4 LBT (Category 4 Listen Before Talk) mechanism. The Cat4 LBT mechanism can be an omnidirectional Cat4 LBT, or a multi - Beam direction Cat4 LBT, or a wide - beam direction Cat4 LBT, or a single - beam direction Cat4 LBT. Optionally, the Cat4 LBT mechanism can be one of the following: Cat4 LBT with a higher priority level, the Cat3 LBT mechanism, the Cat4 LBT mechanism with a random backoff value N (excluding the defer period), the Cat4 LBT mechanism with a random backoff value N (including the defer period), the M - time Cat2 LBT mechanism, the Cat2 LBT mechanism, the LBT mechanism with the defer period duration, and the LBT mechanism obtained by proportionally scaling the above - mentioned LBT mechanism according to SCS.

[0163] Within the MCOT, before the UE / base station performs transmission, the channel access methods it executes include at least one of the following:

[0164] Method 1: If the gap between downlink and uplink, or between uplink and downlink is not greater than the first threshold, the base station / UE may not execute LBT; preferably, the first threshold can be one of the positive integers between 9 us and 43 us.

[0165] Among them, the first threshold is obtained through at least one of the following methods: predefined, physical layer DCI signaling, high layer RRC signaling, MAC signaling.

[0166] Method 2: If the gap between downlink and uplink, or between uplink and downlink is less than the second threshold, or is not less than the first threshold and not greater than the second threshold, then the base station / UE can perform Cat2 LBT, or M times of Cat2 LBT.

[0167] Among them, the first threshold, or the second threshold value, is obtained through at least one of the following methods: predefined, physical layer DCI signaling, high layer RRC signaling, MAC signaling.

[0168] Method 3: At the handover point between downlink and uplink, or between uplink and downlink, before starting downlink / uplink transmission, the base station / UE performs Cat2 LBT, or M times of Cat2 LBT.

[0169] Method 4: At the handover point between downlink and uplink, or between uplink and downlink, before downlink / uplink transmission, the base station / UE adopts the same LBT mechanism as that used when the base station / UE initiates MCOT. The LBT modes can be the same or different.

[0170] For example, when the base station initiates MCOT and adopts Cat4 LBT, within MCOT, after uplink transmission and before downlink transmission, the LBT mechanism adopted by the base station for downlink transmission can be the Cat4 LBT mechanism adopted when the base station initiates MCOT.

[0171] Method 5: At the handover point, before downlink / uplink transmission, the base station / UE adopts a higher-priority LBT mechanism than that used when the base station / UE initiates MCOT. The LBT modes can be the same or different.

[0172] For example, when the base station initiates MCOT and adopts Cat4 LBT with priority level 3, within MCOT, after uplink transmission and before downlink transmission, the LBT mechanism adopted by the base station for downlink transmission can be the Cat4 LBT mechanism with priority level 2 or 1. Priority level 1 > Priority level 2 > Priority level 3, etc.

[0173] Method 6: Within MCOT, before downlink / uplink transmission, the LBT mechanism and / or mode adopted by the base station / UE is related to the duration of its downlink transmission or uplink transmission, and / or beam information.

[0174] For example, within the MCOT, after an uplink transmission, if the remaining duration or proportion of the MCOT occupied by the downlink transmission is not less than a third preset threshold, then a Cat4 LBT with a higher priority, or a Cat3 LBT mechanism, or a Cat4 LBT mechanism with a random backoff value N (excluding the defer period), or a Cat4 LBT mechanism with a random backoff value N (including the defer period), or an LBT mechanism with M times of Cat2 LBT, or a Cat2 LBT mechanism, or an LBT mechanism with a defer period duration, or an LBT mechanism obtained by proportionally scaling the above LBT mechanism according to the SCS is adopted. Conversely, if the remaining duration or proportion of the MCOT occupied by the downlink transmission is not greater than the third preset threshold, then preferably, no LBT is performed, or a Cat2 LBT mechanism, or an LBT mechanism with M times of Cat2 LBT, or an LBT mechanism obtained by proportionally scaling the above LBT mechanism according to the SCS is adopted.

[0175] Method 7: Within the MCOT, the LBT adopted by the base station / UE for downlink / uplink transmission is related to the number of handover points / index indices within the MCOT.

[0176] Optionally, the larger the number of handover points or index, or the closer to the end position of the MCOT, a more thorough mechanism for evaluating channel idle can be adopted, such as a Cat4 LBT mechanism, or a Cat4 LBT with a higher priority, or a Cat3 LBT mechanism, or a Cat4 LBT mechanism with a random backoff value N (excluding the defer period), or a Cat4 LBT mechanism with a random backoff value N (including the defer period), or an LBT mechanism with M times of Cat2 LBT, or a Cat2 LBT mechanism, or an LBT mechanism with a defer period duration, or an LBT mechanism obtained by proportionally scaling the above LBT mechanism according to the SCS.

[0177] Optionally, when the MCOT ends, if the base station / UE still has data / channels / signals to transmit, or if its data / channels / signals have not been completely transmitted, the base station / UE can perform transmission outside the MCOT according to the transmission mode adopted during continuous transmission, and / or the LBT mechanism, and / or the LBT mode. Or, execute a fast LBT mechanism, Cat4 LBT mechanism, or adopt a Cat4 LBT with a higher priority, or Cat3 LBT mechanism, or a Cat4 LBT mechanism with a random backoff value N (excluding the defer period), or a Cat4 LBT mechanism with a random backoff value N (including the defer period), or an M-time Cat2 LBT mechanism, or Cat2 LBT mechanism, or an LBT mechanism with a defer period duration, or an LBT mechanism obtained by scaling the above LBT mechanism according to SCS.

[0178] Optionally, if within the MCOT, at the handover point, the device performs Cat2 LBT, or a simplified Cat2 LBT, or an M-time Cat2 LBT mechanism. When the number of times of performing the Cat2 LBT mechanism exceeds a specific threshold, or when the number of handover points within the MCOT is greater than a specific threshold, the base station or UE can adopt an M-time Cat2 LBT mechanism, a Cat4 LBT with a higher priority, or a Cat3 LBT mechanism, or a Cat4 LBT mechanism with a random backoff value N (excluding the defer period), or a Cat4 LBT mechanism with a random backoff value N (including the defer period), or an M-time Cat2 LBT mechanism, or Cat2 LBT mechanism, or an LBT mechanism with a defer period duration, or an LBT mechanism obtained by scaling the above LBT mechanism according to SCS.

[0179] Optionally, if the number of times of performing a non-Cat2 LBT mechanism exceeds a specific threshold, the base station or UE can adopt Cat2 LBT, or an M-time Cat2 LBT mechanism.

[0180] The specific threshold can be obtained through at least one of the following methods: predefined, higher layer RRC signaling, physical layer DCI signaling.

[0181] Method 8: Within the MCOT, the LBT mechanism adopted by the base station / UE for downlink / uplink transmission is related to the time domain / subframe / slot structure of the current transmission.

[0182] For example, for a downlink-dominated transmission structure, before transmission on the uplink part in the downlink-dominated structure, the UE may not perform LBT, or perform an LBT mechanism of M times Cat2, or a Cat2 LBT mechanism, or an LBT mechanism with a deferperiod duration, or an LBT mechanism obtained by scaling the above LBT mechanism in proportion to the SCS. Alternatively, before the downlink-dominated structure, the base station may perform an LBT mechanism for multiple beam directions, or an LBT mechanism for a single beam direction. The LBT mechanism may adopt a Cat4 LBT with a higher priority, or a Cat3 LBT mechanism, or a Cat4 LBT mechanism with a random backoff value N (excluding deferperiod), or a Cat4 LBT mechanism with a random backoff value N (including defer period), or an LBT mechanism of M times Cat2, or a Cat2 LBT mechanism, or an LBT mechanism with a deferperiod duration, or an LBT mechanism obtained by scaling the above LBT mechanism in proportion to the SCS.

[0183] Method 9: Within the MCOT, the LBT mechanism adopted by the base station / UE for downlink / uplink transmission is related to the priority of the channel / signal corresponding to the transmission. For a channel / signal with a higher priority, a more simplified or faster LBT mechanism is adopted, or the LBT mechanism is not performed.

[0184] Specifically in this embodiment, a typical example of channel access in the case of multiple handover points within an MCOT is given, such as Figure 8 shown Figure 8 is a schematic diagram of the channel access mechanism in the case of multiple handover points within an MCOT Figure 1Before a base station / UE initiates an MCOT, it performs the Cat4 LBT mechanism. Within an MCOT, at the downlink-uplink or uplink-downlink switching point, if the gap at the switching point is not greater than the first threshold, the UE / base station may not perform LBT. If the gap at the switching point is between the first threshold and the second threshold, or not less than the second threshold value, the base station / UE may perform Cat2 LBT, or M times of Cat2 LBT. At the switching point, the LBT mode adopted by the base station / UE may be the default configured mode, or the mode indicated according to dynamic signaling. If the base station / UE does not complete the transmission within the MCOT, generally, the base station / UE needs to perform a Cat4 LBT mechanism outside the MCOT. Optionally, in order to increase the probability of the base station / UE accessing the channel, the base station / UE performs a Cat2 LBT, or M times of Cat2 LBT. Preferably, the LBT mechanism can be performed based on a single beam direction, or multiple beam directions simultaneously, or on a single beam direction or multiple beam directions on other BWPs / Subbands. Optionally, the LBT mechanism outside the MCOT can be notified or indicated by dynamic signaling within the previous MCOT, or can be in the default manner.

[0185] Optionally, at least one of the transmission structure within the MCOT, the number of switching points, the start position of the switching point, the end position of the switching point, the duration of the switching point, the number of times of performing the Cat2 LBT mechanism, and the value of M can be pre-configured or notified to the base station / UE through physical layer dynamic signaling. Optionally, the number of switching points, or the number of times of performing Cat2 LBT, or the value of M can also be determined according to the MCOT / Txop duration, or according to the allowed gap duration within the MCOT, or the number / structure of scheduling units, or according to the SCS. The transmission structure refers to the time-domain transmission structure form composed of the subframe / slot structure within the MCOT, and / or the uplink / downlink attribute of each part, and / or the SCS, and / or the uplink / downlink start position / set, and / or the uplink / downlink end position / set. Optionally, the MCOT transmission structure can be shared among base stations, and / or among UEs, and / or between a base station and a UE.

[0186] For the above-mentioned Cat2 LBT, the CCA detection duration can be one of the positive integers between [1 us, 43 us]. M times of Cat2 LBT can be performing the Cat2 LBT mechanism M times, or the Cat2 LBT mechanism where as long as one LBT is successful among M times.

[0187] If the base station / UE executes the LBT mechanism and detects that the current channel is idle, the base station / UE sends an MCOT. For the start of the MCOT, the downlink / uplink transmission mode, and / or the LBT mechanism, refer to the methods described in Embodiment 1 and / or Embodiment 2.

[0188] Optionally, the transmission beam direction of the base station / UE can be determined according to the LBT result. The base station / UE can perform transmission only in the beam direction where the channel is detected to be idle.

[0189]

[0190] This embodiment provides a channel access method in the case where a UE initiates an MCOT / TxOP.

[0191] For the case where the UE initiates an MCOT, the UE adopts the Cat4 LBT mechanism at the start of the MCOT. The mode of the LBT can be an omnidirectional Cat4 LBT, or a multi-beam direction Cat4 LBT, or a wide-beam direction Cat4 LBT, or a single-beam direction Cat4 LBT.

[0192] If different UEs can share the same MCOT, within the shared MCOT, the UE can execute a Cat2 LBT mechanism, or M times of Cat2 LBT mechanisms before uplink transmission. As Figure 9 shown, Figure 9 is a schematic diagram of channel access in the case where different UEs share an MCOT Figure 1 . Optionally, the UE can execute a Cat4 LBT with a higher priority, or a Cat3 LBT mechanism, or a Cat4 LBT mechanism with a random backoff value N (excluding the defer period), or a Cat4 LBT mechanism with a random backoff value N (including the defer period), or M times of Cat2 LBT mechanisms, or a Cat2 LBT mechanism, or a LBT mechanism with a defer period duration, or a LBT mechanism obtained by proportionally scaling the above LBT mechanisms according to the SCS before uplink transmission. The LBT mechanism, and / or the LBT mode, and / or the LBT detection position executed by the shared UEs within the MCOT can be predefined, and / or indicated by physical layer DCI signaling, and / or high-layer RRC signaling.

[0193] Optionally, the UE sharing the MCOT can determine whether to share the MCOT of the initiating UE through CCA detection patterns, and / or beam directions / information, and / or channel / signal identification. For example, the UE sharing the MCOT is configured with the same CCA detection pattern. For instance, in the frequency domain, it does not transmit / is vacant / blank at even / odd resource positions and transmits signals at odd / even resource positions. Another example is that the CCA detection pattern can adopt the comb structure of SRS. If the UE sharing the MCOT detects that the channel is idle in the even / odd frequency domain resources, the channel is considered available, or it is available to share this MCOT. Or, if the UE sharing the MCOT detects that the channel is idle in the even / odd frequency domain resources and detects that the channel is busy / idle in the odd / even resources, the channel is considered available, or it is available to share this MCOT. Further, among the UEs sharing the MCOT, at least one of the information on the start position, end position, CCA detection pattern, CCA detection position, and SCS within its MCOT can be shared. Another example is that the UEs sharing the MCOT share information such as the beam direction of the uplink transmission, so that the UE sharing the MCOT initiated by other UEs can identify whether the current MCOT is initiated by the sharing UE. This method is also applicable to the base station sharing the MCOT. If it cannot be identified, the UE needs to execute a Cat4 LBT mechanism and initiate a new MCOT.

[0194] Differently from Figure 9 the difference is Figure 10 the schematic diagram of channel access in the case where different UEs share one MCOT Figure 2 . Before the start of the MCOT, the first type of UE executes the Cat4 LBT mechanism. If it detects that the channel is idle, it initiates an MCOT. Within the MCOT, at the odd / even switching points, the UE executes the LBT mechanism, and / or the LBT mode, and / or the LBT detection position, and / or the SCS can be indicated to the UE by the base station through physical layer DCI signaling. Optionally, the UE uses the LBT method adopted for the transmission within the MCOT for channel access. For example, it does not execute LBT, or Cat2 LBT, or the M - time LBT mechanism.

[0195] If different UEs cannot share the same MCOT. As Figure 11 shown Figure 11 it is the schematic diagram of channel access in the case where different UEs cannot share one MCOT Figure 1The UE that cannot share an MCOT refers to the UE that has no information transfer with the base station before resource scheduling within the MCOT. If a UE uses the Cat4 LBT mechanism for channel access before starting transmission. If the channel is detected to be idle, then this UE (marked as UE1, or the first type of UE) initiates an MCOT. Within the MCOT initiated by this UE, after the uplink and before the downlink, if the gap between the uplink and the downlink is not greater than the first threshold, the base station may not perform LBT. If the gap between the uplink and the downlink is between the first threshold and the second threshold, or not less than the second threshold value, the base station may perform Cat2 LBT, or M times of Cat2 LBT. Further, another UE (for example, UE2, or the second type of UE, or the UE that cannot share the MCOT initiated by UE1 or the first type of UE) is scheduled within the MCOT initiated by UE1 or the first type of UE. At this time, this UE may perform a Cat4 LBT mechanism, or a Cat4 LBT mechanism with a high priority level. If the channel is detected to be idle, then this UE initiates a new MCOT. Optionally, if this UE (for example, UE2, or the second type of UE, or the UE that cannot share the MCOT initiated by UE1 or the first type of UE) receives the information of the MCOT notified by the base station, and / or the LBT mechanism, and / or the LBT mode, and / or the LBT location, and / or the indication information of sharing the MCOT, and / or the beam information, etc., then the UE may not perform the Cat4 LBT mechanism, or perform a Cat2 LBT mechanism, or M Cat2 LBT mechanisms, or the Cat4 LBT mechanism. Optionally, use a Cat4 LBT mechanism with a high priority level, and / or the UE does not initiate a new MCOT again.

[0196] If different UEs cannot share the same MCOT. As Figure 12 shown, Figure 12 is the schematic diagram of channel access in the case where different UEs cannot share an MCOT Figure 2If UE1 successfully executes the Cat4 LBT mechanism before starting transmission, UE1 sends an MCOT / TxOP. UE2 performs an idle channel assessment during the period when UE1 occupies the channel. If it determines that the current channel is idle, UE2 can initiate a new MCOT / TxOP. At this time, if UE2 and UE1 use different beams on overlapping resources, or the interference in the beam direction is within the allowable range, UE2 and UE1 can perform transmission within their respective initiated MCOT / TxOPs. If, during the MCOT / TxOP of UE1, the channel is preempted by UE2, UE1 abandons the transmission within the current MCOT / TxOP, or UE1 or the device sharing the MCOT / TxOP with UE1 can attempt to continue channel access on the candidate transmission opportunities within the MCOT / TxOP. Generally, when UE2 initiates a new MCOT / TxOP, it needs to execute the Cat4 LBT mechanism. Optionally, it can execute a Cat4 LBT with a higher priority, or a Cat3 LBT mechanism, or a Cat4 LBT mechanism with a random backoff value N (excluding the defer period), or a Cat4 LBT mechanism with a random backoff value N (including the defer period), or an M - time Cat2 LBT mechanism, or a Cat2 LBT mechanism, or an LBT mechanism with a defer period duration, or an LBT mechanism obtained by scaling the above LBT mechanisms according to SCS. Optionally, the LBT mode can be an LBT mode for a single beam direction, or an LBT mode for multiple beam directions, etc.

[0197]

[0198] This embodiment provides a channel access method on different BWPs / Subbands. The device can be a base station or a terminal UE.

[0199] According to the LBT result, determine the BWP / Subband used by the device for transmission. The device can perform LBT on each BWP / Subband, or perform LBT on the bandwidth corresponding to the BWP / Subband. Further, the LBT can be an omnidirectional LBT mechanism, or an LBT mechanism for a single beam direction, or an LBT mechanism for multiple beam directions.

[0200] For a device that adopts an omni-directional LBT mechanism on different BWPs / Subbands, if the device detects that the channel is idle on the L BWPs / Subbands, the device can transmit on at least one of the L BWPs / Subbands. If a BWP / Subband with a detected busy channel is found among the L BWPs / Subbands, the device abandons the current transmission on the BWP / Subband detected as busy. Further, before the next candidate starting position, the LBT mechanism continues to be executed.

[0201] For a device that adopts a single-beam direction LBT mechanism on different BWPs / Subbands, if the device detects that the channel is idle in the corresponding beam direction on the L BWPs / Subbands, it transmits in the detected idle BWP / Subband in accordance with the beam direction. Conversely, if the channel in the corresponding beam direction on the L BWPs / Subbands is detected as busy, the device abandons the current transmission in the corresponding beam direction on the BWP / Subband detected as busy. Optionally, the device can switch the beam direction, or execute the LBT mechanism simultaneously in multiple beam directions. If the channel is detected as idle in the switched beam direction, the BWP / Subband is considered currently available.

[0202] For a device that adopts a multiple-beam direction LBT mechanism on different BWPs / Subbands, if the number of detected idle beam directions on the L BWPs / Subbands is not less than 1, the device can transmit simultaneously in the detected idle beam directions on the BWP, or initiate transmission on at least one of the detected idle beam directions on the BWP. Preferably, when multiple beam directions are detected as having an idle channel, the device selects the beam direction with the least in-beam interference for transmission.

[0203] Optionally, for the next resource, the device can execute the LBT mechanism in the above manner on the currently active BWP / Subband. Or, the device can execute the LBT mechanism in the above manner on the configured L BWPs / Subbands.

[0204] The processing method for a detected busy channel on different BWPs / Subbands can refer to the method described in Embodiment 2.

[0205] For example, assume that the transmission bandwidth of UE1 is marked as subband subband#1, or it can also be marked as BWP#1. The transmission bandwidth of UE2 is marked as subband subband#2, subband subband#3, or it can also be marked as BWP#2. The transmission bandwidth of UE3 is marked as subband subband#2, subband subband#3, subband subband#4, or it can also be marked as BWP#3. As Figure 13 shown, Figure 13 FIG. is a schematic diagram of the LBT method based on BWP / Subband. The subband, subband LBT mechanism, subband LBT mode, beam direction, LBT start time, and LBT position can be determined by at least one of the following: predefined, physical layer DCI signaling, high layer RRC signaling, MAC signaling. UE1 can perform the LBT mechanism on subband#1 in the omnidirectional, single-beam direction, multi-beam direction, or wide-beam direction mode. If UE1 detects that the channel is idle, it can transmit on subband#1. Otherwise, it can follow the processing method when detecting a busy channel described in Embodiment 2. For UE2, multi-subband LBT can be performed simultaneously on subband#2 and subband#3. Different beam directions or the same beam direction can be adopted on each subband. Optionally, UE2 can perform LBT detection in the beam directions configured for each subband, or perform the LBT mechanism in multiple beam directions. UE2 only transmits in the direction corresponding to the beam where the channel is detected to be idle. Optionally, if UE2 performs the LBT mechanism in multiple beam directions, if only one beam direction is detected to be idle, then this beam direction is used as the beam direction for the current transmission. UE2 does not transmit in the beam directions where no idle is detected. If the number of detected beam directions is not less than 1, UE can transmit in the multiple beam directions detected to be idle, or transmit in the s beam directions with the best channel conditions among the detected idle beams. The s is a positive integer greater than or equal to 1. The processing for UE3 is the same as that for UE2. Further, if there is a subband in the configured subbands of UE2 or UE3 where the LBT fails, then UE2 or UE3 can only transmit on the subbands where the LBT is successful. The processing of the UE when the LBT fails can all refer to the processing method of Embodiment 2.

[0206] For the case where UE initiates MCOT, outside or before MCOT, UE accesses the channel in at least one of the following ways:

[0207] Method 1: Perform Cat4 LBT for BWP;

[0208] Method 2: The UE performs the Cat4 LBT mechanism for each subband on the respective subbands;

[0209] Method 3: The UE adopts the Cat4 LBT mechanism for a subband with priority level A, and adopts the Cat4 LBT mechanism with a priority level higher than priority level A for other subbands;

[0210] Method 4: The UE adopts the Cat4 LBT mechanism for a subband, and adopts the LBT mechanism with a delay period duration for other subbands.

[0211] Method 5: Reuse the multiple carrier LBT methods standardized in LAA, that is, adopt Cat4 LBT on one carrier and Cat2 LBT on other carriers.

[0212] In the above methods, the LBT modes adopted for BWP or different subbands can be different or the same. For Method 2, the same contention window size (or the same random backoff value N) can be configured for different subbands, and / or the same priority level can be adopted, and / or a smaller random backoff value / backoff window can be configured for subbands with poor channel conditions. The determination of a subband described in Method 3 and Method 4 can be through at least one of the following methods: predefined, carrier selection, physical layer DCI signaling indication, high layer RRC signaling indication, MAC layer signaling indication.

[0213] For the case where the BWPs of different UEs overlap, different UEs can perform the Cat4 LBT mechanism on their respective BWPs. To achieve spatial multiplexing / reuse between different UEs, if different UEs use beam directions for transmission, then different UEs can adopt the BWP Cat4 LBT mechanism based on the beam direction.

[0214] Optionally, different UEs can perform LBT for multiple subbands on their respective subbands. For a UE with multiple subbands for LBT, reference can be made to the corresponding methods in the present invention. Similarly, for the case where different UEs are in the same subband, if different UEs use beam directions for transmission, then different UEs can perform the LBT mechanism on their respective beam directions or multiple beam directions simultaneously, which is beneficial to improving the channel access probability and also beneficial to achieving spatial multiplexing / reuse. For the specific spatial multiplexing / reuse method, refer to the next embodiment.

[0215] Similarly, within the MCOT, the UE may adopt the Cat2 LBT mechanism, or the M - time Cat2 LBT mechanism.

[0216]

[0217] This embodiment provides a way of spatial multiplexing / reuse. Spatial multiplexing / reuse mainly focuses on describing the way that devices use different beam directions for transmission at the same time. The devices include a base station and / or a terminal UE.

[0218] Assume that Device 1 uses beam index #1 for transmission. Before transmission, Device 1 executes the LBT mechanism to determine the busy / idle status of the current channel. If the channel is detected to be idle, Device 1 uses beam index #1 for transmission. To improve the spatial multiplexing / reuse efficiency / factor, it is expected that other devices can also use other beam indices while Device 1 uses beam index #1 for transmission.

[0219] If the system supports spatial multiplexing / reuse between different devices, different devices are configured with different beam indices at the same time. For spatial multiplexing / reuse between base stations, preferably, information interaction is required between base stations before transmission. The information content of the interaction is at least one of the following: beam index information, time - domain resource information (e.g., time - domain pattern, etc.), frequency - domain resource information, SCS, transmission structure of the MCOT, sub - frame / slot structure, LBT mechanism, LBT position, LBT mode. For spatial multiplexing / reuse between UEs, the base station can notify the UE of the transmission beam index information, time - domain resource information (e.g., time - domain pattern, etc.), frequency - domain resource information, SCS, transmission structure of the MCOT, sub - frame / slot structure through at least one of physical layer DCI signaling, high - layer RRC signaling, and MAC layer signaling. Or, the beam index information between different base stations / UEs is pre - configured.

[0220] Based on the above method, the base station / UE executes the LBT mechanism in the beam direction before transmission. If the channel in the beam direction is detected to be idle, the base station / UE transmits according to the beam direction.

[0221] Optionally, if there is no information interaction between the base station / UE before transmission, the LBT mechanism can be executed in the corresponding beam direction before transmission, or the LBT mechanism can be executed simultaneously in multiple beam directions. The base station / UE can perform transmission in the beam direction where the channel is detected to be idle. Or, perform transmission in the beam direction where the channel is detected to be idle and the interference is minimal. Optionally, the multiplexed device can execute the Cat2 LBT mechanism, or the M - time Cat2 LBT mechanism. Optionally, the multiplexed device can also execute the Cat4 LBT mechanism.

[0222] If different base stations / UEs are configured with the same beam direction, in order to improve the spatial reuse factor, when the base station / UE detects that the interference level or energy in the beam direction is not less than the first detection threshold and not greater than the second detection threshold, it is considered that the base station / UE detects the channel to be idle.

[0223] Illustrate the multiplexing method between devices without information interaction. For example Figure 14 as shown Figure 14Schematic diagram for spatial multiplexing / reuse of different UEs. Assume that UE1 is scheduled on Resource #1, Resource #2, Resource #3, and Resource #4, and the beam directions used in sequence are index #1, index #1, index #2, and index #3. UE2 is scheduled on Resource #2, Resource #3, and Resource #4, and the beam directions used in sequence are index #2, index #2, and index #4. If UE1 performs LBT to detect an idle channel before transmission, it will transmit on Resource #1 using beam index #1. Generally, UE1 does not need to perform LBT before transmitting on Resource #2 and can directly transmit in the beam direction corresponding to beam #1. Optionally, UE1 can perform a fast LBT mechanism before transmitting on Resource #2. Optionally, UE1 reserves or idles the time domain and / or frequency domain resources for the LBT mechanism, which is also beneficial for UEs in spatial multiplexing to evaluate the idle channel. On Resource #2, UE2 needs to perform an LBT mechanism before transmission to determine the idle status of the channel in the direction of beam index #2. UE2 can perform a fast LBT mechanism, for example, a Cat2 LBT mechanism, or an LBT mechanism of M times of Cat2. Optionally, if UE1 and UE2 are not available to share an MCOT, UE2 needs to perform a Cat4 LBT mechanism before transmitting on Resource #2. Preferably, a Cat4 LBT mechanism with a higher priority level can be performed. On Resource #3, since UE1 and UE2 use the same beam direction, UE1 and UE2 need to use an LBT mechanism based on a single beam direction. Optionally, the time domain positions at which UE1 and UE2 perform LBT can be different. For example, the time when UE1 performs LBT is earlier than the time when UE2 performs LBT. At this time, if the energy / interference detected by UE2 / UE1 is not less than the first detection threshold and not greater than the second detection threshold, then it is considered that the channel detected by UE1 / UE2 is idle. In another way, the positions and / or times at which UE1 and UE2 perform LBT are the same. By analogy, the above method can be used for transmission on subsequent resources. Optionally, the UE performs the LBT operation, which can be indicated by the base station through dynamic signaling. This embodiment is also applicable to spatial multiplexing / reuse on the base station side.

[0224] Another example is the multiplexing method when there is information interaction between devices. Assume it is spatial multiplexing / reuse between base stations. Before transmission, the base stations first perform information interaction. The information content of the interaction is at least one of the following: beam index information, time-domain resource information (e.g., time-domain pattern, etc.), frequency-domain resource information, SCS, transmission structure of MCOT, subframe / slot structure, LBT mechanism, LBT position, LBT mode. Assume different base stations tell the surrounding base stations the transmission beam index information corresponding to which resources of their own. Or, different base stations tell the surrounding base stations the beam index information that is not applicable to which resources of their own. Optionally, the base station can notify the UE of the relevant information. Based on the interaction information, the base station / UE executes the LBT mechanism before transmitting on the corresponding resources. Transmission is performed in the detected idle beam direction. Optionally, the base station can dynamically indicate whether the LBT mechanism needs to be executed before the current transmission, and / or, the LBT mechanism mode, and / or, the LBT position.

[0225] Another way is to configure the same beam direction pattern between devices under the same operator. Or, different UEs under the same cell configure different beam direction patterns. Or, different operators configure different beam direction patterns. The device can execute the LBT mechanism in at least one beam direction in the configured beam pattern. If idle is detected, transmission can be performed on at least one of the detected idle beams. For devices with the same beam direction, the same LBT detection position can be configured. Optionally, in order to increase the spatial multiplexing / reuse factor, a dual detection threshold method can be adopted. Also, different LBT detection mechanisms and / or different LBT detection start positions can be configured according to the priority of the devices with the same beam direction, or according to the priority of the signals / channels transmitted by the devices.

[0226] An embodiment of the present invention further provides a device for information transmission, including:

[0227] A transmission module, configured to transmit information on the configured resources.

[0228] As Figure 15 shown, an embodiment of the present invention further provides a device for information transmission, including a memory 201, a processor 202, and a computer program 203 stored on the memory 201 and executable on the processor 202. When the processor 202 executes the computer program 203, the method for information transmission is implemented.

[0229] An embodiment of the present invention also provides a computer-readable storage medium storing computer-executable instructions for executing the method of information transmission.

[0230] In this embodiment, the above storage medium may include but is not limited to: various media that can store program codes such as USB flash drives, read-only memories (ROMs), random access memories (RAMs), mobile hard disks, magnetic disks, or optical discs.

[0231] Those of ordinary skill in the art can understand that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, and their appropriate combinations. In the hardware implementation, the division of the functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be executed by several physical components in cooperation. Some components or all components may be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Computer storage media include but are not limited to RAM, ROM, EEPROM, flash memory, or other memory technologies, CD-ROM, digital versatile disc (DVD), or other optical disc storage, magnetic cassette, tape, magnetic disk storage, or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, a communication medium typically includes computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and may include any information delivery medium.

Claims

1. A method for information transmission, comprising: The device performs a channel access procedure under any of the following circumstances: When the device transmits using different beam directions, before transmission, the device separately performs a channel access procedure using the Cat 3 LBT mechanism in different beam directions; Or, When the device transmits using different beam directions within the maximum channel occupancy time (MCOT), before switching to different beams within the MCOT, the device performs a channel access procedure using the Cat 2 LBT mechanism; In response to the result of the channel access procedure, the device performs information transmission in one or more beams.

2. The method according to claim 1, wherein The step that when the device transmits using different beam directions, before transmission, the device separately performs a channel access procedure using the Cat 3 LBT mechanism in different beam directions includes: If the channel is detected to be busy, the device abandons transmission on the current resource; or, If the channel is detected to be busy, the device continues to perform a channel access procedure according to at least one of the previous LBT mode and LBT mechanism before the next possible transmission start position; or, If the channel is detected to be busy, the device changes the Beam direction for performing LBT and retries the channel access procedure; or, If the channel is detected to be busy, the device performs a channel access procedure using a simplified LBT mechanism or a fast LBT mechanism that is simpler than the previous one in multiple beam directions before the next possible transmission start position; or, If the channel is detected to be idle, the device transmits on one or more beams detected to be idle.

3. The method according to claim 1, characterized in that The step that the device performs information transmission in one or more beams includes: The device transmits using multiple beam directions on the configured resources, or the beam directions used by the device for information transmission on the current resource include at least one of the transmission beam directions in subsequent resources, or the number of beam directions for simultaneous transmission using multiple beam directions shows a decreasing trend in the order of increasing resource index.

4. The method according to claim 1, wherein When the device transmits using different beam directions within the MCOT, before switching to different beams within the MCOT, in the case that the device performs a channel access procedure using the Cat 2 LBT mechanism, the step that the device performs information transmission in one or more beams includes: If the channel is detected to be idle using the Cat 2 LBT mechanism, within the MCOT, the device performs information transmission in one or more beams; or, When the device transmits using different beam directions, before transmission, in the case that the device separately performs a channel access procedure using the Cat 3 LBT mechanism in different beam directions, the step that the device performs information transmission in one or more beams includes: If the channel is detected to be idle using the Cat 3 LBT mechanism, the device performs information transmission using the beam direction detected to be idle.

5. The method according to claim 1, characterized in that, Within the MCOT, the conditions for performing the channel access procedure include at least one of the following: The gap between downlink and uplink, or between at least one of uplink and downlink, is less than or equal to a first threshold, and the device does not perform channel access using the LBT mechanism; The gap between downlink and uplink, or between at least one of uplink and downlink, is greater than a second threshold, or is not less than the first threshold and not greater than the second threshold, and the device performs Cat2 LBT, or the Cat2 LBT mechanism M times.

6. The method according to claim 1 or 4 or 5, characterized in that, The duration of the Cat 2 LBT mechanism is 16 us or 25 us.

7. An information transmission device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method for information transmission as described in any one of claims 1 to 6.

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