WO2016165365A1

WO2016165365A1 - Method, base station and system for preempting unlicensed carrier

Info

Publication number: WO2016165365A1
Application number: PCT/CN2015/097197
Authority: WO
Inventors: 赵亚军; 李儒岳; 张晨晨; 邬华明
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-04-14
Filing date: 2015-12-11
Publication date: 2016-10-20
Also published as: CN106162891A

Abstract

Disclosed is a method for preempting an unlicensed carrier, comprising the following steps: configuring uplink preemption attributes and downlink preemption attributes of a preset unlicensed carrier; and preempting an uplink carrier and a downlink carrier of the preset unlicensed carrier based on the configured uplink preemption attributes and downlink preemption attributes. Also disclosed are a base station and system for preempting an unlicensed carrier. The present invention improves the probability of simultaneous preemption of an uplink carrier and a downlink carrier for data transmission in an unlicensed carrier, thereby realizing the preemption of the uplink carrier and the downlink carrier in the unlicensed carrier more efficiently.

Description

Unlicensed carrier preemption method, base station and system

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method, a base station, and a system for preempting an unlicensed carrier.

Background technique

LTE uses Unlicensed-Unlicensed (LTE-U) to deploy LTE in unlicensed carriers to meet the increasing capacity requirements of wireless communication systems and improve the efficiency of unlicensed spectrum. It is LTE and the future. An important evolutionary direction of wireless communication is possible.

At present, when designing LTE-U, it is necessary to consider not only to seize unlicensed carriers between different systems such as Wireless Fidelity (WiFi) and radar, but also to consider the competition between LTE-U and the same system. Authorize the carrier for data transmission. For example, if it is required to simultaneously transmit uplink and downlink data in an unlicensed carrier, it is necessary to simultaneously seize the opportunity of uplink and downlink occupied carriers and transmit data. The uplink transmission in the LTE-U generally requires the user equipment UE to preempt the uplink occupied carrier, and the downlink transmission requires the base station eNB to preempt the downlink occupied carrier. Because the existing LTE-U uses the unlicensed carrier method, both the UE and the eNB perform blind preemption from a large number of candidate unlicensed carriers. In a hotspot scenario with high load, the UE and the eNB are difficult to preempt the idle unlicensed carrier. Moreover, the UE and the eNB may compete with each other when the uplink and downlink carriers are preempted from a large number of candidate unlicensed carriers, so that the probability that the UE and the eNB simultaneously occupy the uplink and downlink carriers for data transmission is greatly reduced. In the prior art, uplink and downlink carriers cannot be preempted in an unlicensed carrier.

The above content is only used to assist in understanding the technical solutions of the present invention, and does not constitute an admission that the above is prior art.

Summary of the invention

The main purpose of the embodiments of the present invention is to provide a preemption method, a base station, and a system for unlicensed carriers, which are designed to improve the probability of preempting uplink and downlink carriers in an unlicensed carrier.

To achieve the foregoing, the method for preempting an unlicensed carrier according to the embodiment of the present invention includes the following steps:

Configure the uplink occupation attribute and downlink occupation attribute of the preset unlicensed carrier.

The uplink carrier and the downlink carrier are preempted for the preset unlicensed carrier based on the configured uplink occupied attribute and the downlink occupied attribute.

Optionally, the step of configuring the uplink occupation attribute and the downlink occupation attribute of the preset unlicensed carrier includes:

And grouping the preset unassigned carriers, where the packet includes an uplink carrier group, a downlink carrier group, and/or an uplink and downlink carrier group; wherein, the carrier in the uplink carrier group is used for preemption of an uplink carrier; and the downlink carrier group Carrier in the middle Preemption of row carriers; carriers in the uplink and downlink carrier groups are used for preemption of uplink and/or downlink carriers.

Optionally, the step of configuring the uplink occupation attribute and the downlink occupation attribute of the preset unlicensed carrier further includes:

Configuring a preset downlink time slot for the time slot of the carrier in the uplink carrier group, where the carrier in the preset downlink time slot is used for preset downlink auxiliary signal transmission;

A preset uplink time slot is configured for the time slot of the carrier in the downlink carrier group, and the carrier in the downlink carrier group that is in the preset uplink time slot is used for preset uplink auxiliary signal transmission.

Optionally, the downlink auxiliary signal includes: one or more downlink cell discovery signals, and/or one or more reserved signals; and the uplink auxiliary signal includes: one or more uplink sounding reference signals SRS.

Optionally, the step of performing preemption of the uplink carrier and the downlink carrier on the preset unlicensed carrier according to the configured uplink occupation attribute and the downlink occupation attribute includes:

Performing an idle channel assessment on the carrier in the uplink carrier group, using a carrier lower than the preset channel estimation threshold or the channel idle state in the uplink carrier group as an uplink carrier, and preempting the uplink carrier;

The carrier in the downlink carrier group is subjected to the idle channel estimation, and the carrier in the downlink carrier group that is lower than the preset channel estimation threshold or in the channel idle state is used as the downlink carrier, and the downlink carrier is preempted.

Performing idle channel estimation on the carrier in the uplink carrier group and the carrier in the downlink carrier group, and determining whether the carrier in the uplink carrier group and the carrier in the downlink carrier group are available, based on the scheduling of the base station eNB The carrier in the uplink carrier group or the carrier in the downlink carrier group occupies a time slot and an occupied duration, and preempts the carrier in the downlink carrier group or preempts the carrier in the uplink carrier group; or

Configuring a downlink occupied time slot or a subframe to determine the total duration of the occupation, the uplink carrier group, and the downlink carrier group respectively occupied by the uplink carrier group and the downlink carrier group. The duration, and the uplink and downlink switching time points; or, one or more of the following parameters are pre-configured: a fixed total occupied duration, a fixed uplink and downlink time configuration ratio, and a time point of uplink and downlink switching; or

When the carrier in the uplink carrier group and the downlink carrier group is pre-configured to be simultaneously available to the base station eNB and the terminal, the carrier in the downlink carrier group is preempted; or

When a periodic signal with a higher uplink priority needs to be sent, the carrier in the uplink carrier group is preempted, or the time slot in which the uplink periodic signal is located is preferentially allocated as the uplink carrier group and the downlink carrier group. The uplink time slot of the unlicensed carrier; when the periodic signal with a higher downlink priority needs to be transmitted, the carrier in the downlink carrier group is preempted, or the time slot in which the downlink periodic signal is located is preferentially allocated as the The downlink time slot of the unlicensed carrier in the downlink carrier group is described.

Configuring a time slot for each unlicensed carrier in the preset unlicensed carrier includes an uplink time slot, a downlink time slot, and/or an uplink and downlink time slot; wherein, the unlicensed carrier in the uplink time slot is used for preemption of the uplink carrier; The unlicensed carrier of the time slot is used for preemption of the downlink carrier; the unlicensed carrier of the uplink and downlink time slot is used for preemption of the uplink and/or downlink carrier.

Performing an idle channel evaluation on the unlicensed carrier in the uplink time slot, and using the carrier that is lower than the preset channel estimation threshold or the channel idle state in the unlicensed carrier in the uplink time slot as the uplink carrier, and preempting the uplink carrier;

The idle channel is evaluated for the unlicensed carrier in the downlink time slot, and the carrier that is lower than the preset channel estimation threshold or the channel idle state in the unlicensed carrier in the downlink time slot is used as the downlink carrier, and the downlink carrier is preempted.

The uplink time slot of each unlicensed carrier is divided into an uplink short time slot and an uplink long time slot, wherein the duration of the uplink short time slot is smaller than the uplink long time slot, and the unlicensed carrier in the uplink short time slot is used for transmitting the uplink control. Information; an unlicensed carrier in an uplink long time slot is used to transmit uplink user data;

The downlink time slot of each unlicensed carrier is divided into a downlink short time slot and a downlink long time slot, wherein the duration of the downlink short time slot is smaller than the downlink long time slot, and the unlicensed carrier of the downlink short time slot is used for transmitting the downlink control Information; the unlicensed carrier in the downlink long time slot is used to transmit downlink user data.

When the uplink user data needs to be transmitted, the idle channel is evaluated on the unlicensed carrier in the uplink long time slot, and the unlicensed carrier in the uplink long time slot is lower than the preset channel estimation threshold or the channel idle state. As an uplink carrier, preempting the uplink carrier;

When the downlink user data needs to be transmitted, the idle channel is evaluated for the unlicensed carrier that is in the downlink long time slot, and the unlicensed carrier that is in the downlink long time slot is lower than the preset channel estimation threshold or the channel idle state. As a downlink carrier, the downlink carrier is preempted.

Optionally, the step of performing preemption of the uplink carrier and the downlink carrier on the preset unlicensed carrier according to the configured uplink occupation attribute and the downlink occupation attribute further includes:

When the uplink control information needs to be transmitted, the unlicensed carrier that is in the uplink short time slot is used as the uplink carrier, and the uplink carrier is preempted;

When the downlink control information needs to be transmitted, the unlicensed carrier that is in the downlink short time slot is used as the downlink carrier, and the downlink carrier is preempted.

Optionally, the uplink short time slot and the uplink long time slot meet the following condition: when the uplink short time slot overlaps with the uplink long time slot, send an uplink long time slot signal; and transmit the uplink Short time slot signal, or, interrupting the uplink short Time slot signal transmission;

The uplink short time slot and the uplink long time slot satisfy the following condition: when the downlink short time slot overlaps with the downlink long time slot, send a downlink long time slot signal; and transmit the downlink short time slot signal Or interrupt the downlink short time slot signal transmission.

Optionally, the method further includes: the user equipment UE receives or does not receive the downlink short time slot signal according to a default configuration or a display indication; and the UE sends or does not send the uplink line short time based on a default configuration or a display indication. Gap signal.

In addition, to achieve the above object, the present invention further provides a base station that preempts an unlicensed carrier, where the base station preempting the unlicensed carrier includes:

The configuration module is configured to configure an uplink occupied attribute and a downlink occupied attribute of the preset unlicensed carrier.

The preemption module is configured to perform preemption of the uplink carrier and the downlink carrier on the preset unlicensed carrier by setting the uplink occupied attribute and the downlink occupied attribute according to the configuration.

Optionally, the configuration module is further configured to:

And grouping, by the uplink carrier group, the downlink carrier group, and/or the uplink and downlink carrier group, where the carrier in the uplink carrier group is set to preemption of the uplink carrier; the downlink carrier group The carrier in the uplink carrier is used for preemption of the downlink carrier, and the carrier in the uplink and downlink carrier group is used for preemption of the uplink and/or downlink carrier.

Optionally, the configuration module is further configured to:

Optionally, the preemption module is further configured to:

The preemption module is further configured to: perform idle channel estimation on a carrier in the uplink carrier group and a carrier in a downlink carrier group, where a carrier in the uplink carrier group and a carrier in the downlink carrier group are available. And determining, according to the scheduling of the base station eNB, the carrier in the uplink carrier group or the carrier occupied time slot and the occupied duration in the downlink carrier group, and preempting the carrier in the downlink carrier group or in the uplink carrier group Carrier carrier for preemption; or,

Optionally, the configuration module is further configured to:

Optionally, the preemption module is further configured to:

Optionally, the configuration module is further configured to:

Optionally, the preemption module is further configured to:

When the downlink user data needs to be transmitted, the idle channel is evaluated for the unlicensed carrier in the downlink long time slot, and will be The unlicensed carrier that is lower than the preset channel estimation threshold or the channel idle state is used as the downlink carrier in the unlicensed carrier of the downlink long time slot, and preempts the downlink carrier.

Optionally, the preemption module is further configured to:

Optionally, when the uplink short time slot overlaps with the uplink long time slot, sending an uplink long time slot signal; transmitting the uplink short time slot signal, or interrupting the uplink short time slot signal transmission;

And when the downlink short time slot overlaps with the downlink long time slot, sending a downlink long time slot signal; transmitting the downlink short time slot signal, or interrupting the downlink short time slot signal transmission.

The embodiment of the present invention further provides a system for preempting an unlicensed carrier, where the system for preempting an unlicensed carrier includes: a base station and a user equipment, where

The base station configures an uplink occupied attribute and a downlink occupied attribute of the preset unlicensed carrier, and sends the configured uplink unoccupied attribute and the downlink occupied attribute of the preset unlicensed carrier to the user equipment;

Receiving, by the user equipment, an uplink occupied attribute and a downlink occupied attribute of the preset unlicensed carrier configured by the base station;

The base station and/or the user equipment perform preemption of the uplink carrier and the downlink carrier on the preset unlicensed carrier based on the configured uplink occupied attribute and the downlink occupied attribute.

Optionally, the user equipment is further configured to:

Uplink data is transmitted to the base station based on the preempted uplink carrier.

Optionally, the base station is further configured to:

The downlink data is transmitted to the user equipment based on the preempted downlink carrier.

The non-authorized carrier preemption method, the base station, and the system according to the embodiment of the present invention can be configured based on the uplink occupation attribute and the downlink occupation attribute of different unlicensed carriers, and can be based on the uplink occupation attribute and downlink occupation of different unlicensed carriers. Attributes independently perform uplink and downlink carrier preemption, which not only narrows the preemption range of uplink and downlink carriers in different unlicensed carriers, but also does not compel the uplink and downlink carrier preemption of unlicensed carriers. The probability of simultaneously preempting the uplink and downlink carriers for data transmission in the unlicensed carrier, and more effectively achieving the preemption of the uplink and downlink carriers in the unlicensed carrier.

DRAWINGS

The drawings described herein are provided to provide a further understanding of the invention, which form a part of this application, The illustrative embodiments and the description thereof are illustrative of the invention and are not to be construed as limiting the invention. In the drawing:

1 is a schematic flowchart of an embodiment of a method for preempting an unlicensed carrier according to an embodiment of the present invention;

2 is a schematic diagram of functional modules of an embodiment of a base station for preempting an unlicensed carrier according to the present invention;

FIG. 3 is a schematic structural diagram of an embodiment of a system for preempting an unlicensed carrier according to the present invention.

The implementation, functional features, and advantages of the present invention will be further described in conjunction with the embodiments.

detailed description

It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The invention provides a preemption method for an unlicensed carrier.

Referring to FIG. 1, FIG. 1 is a schematic flowchart diagram of an embodiment of a method for preempting an unlicensed carrier according to an embodiment of the present invention.

In an embodiment, the method for preempting the unlicensed carrier includes:

Step S10: Configure an uplink occupied attribute and a downlink occupied attribute of the preset unlicensed carrier.

In the use of the unlicensed carrier, it is necessary to avoid using the unlicensed carrier that is already in use in the unlicensed carrier when the Clear Channel Assessment (CCA) threshold is exceeded. Otherwise, the system may interfere with each other. . Therefore, in some areas, the unlicensed carrier is required to support the Listening Before Talk (LBT) function, that is, before using an unlicensed carrier, the CCA needs to be executed first, and if the device is found to be using the unlicensed carrier. , or the detected signal energy exceeds the CCA threshold, delay access. If the channel is found to be idle, or the detected signal energy is lower than the CCA threshold, the unlicensed carrier is occupied.

In this embodiment, before performing the CCA to use the unlicensed carrier, the uplink occupied attribute and the downlink occupied attribute of the preset unlicensed carrier are pre-configured, wherein the preset unlicensed carrier may be a specific unlicensed carrier, or may be a candidate. Multiple unlicensed carriers are available. The configuration of the preset unlicensed carrier may be configured with the uplink occupied attribute and the downlink occupied attribute for different unlicensed carriers according to the uplink and downlink service conditions, the frequency band distribution, the geographical location, and the time slot distribution, for subsequent preemption and use.

Step S20: Perform preemption of the uplink carrier and the downlink carrier on the preset unlicensed carrier based on the configured uplink occupied attribute and the downlink occupied attribute.

After the uplink occupation attribute and the downlink occupation attribute are configured for different unlicensed carriers, the uplink carrier and the downlink carrier are preempted for the preset unlicensed carrier based on the configured uplink occupation attribute and the downlink occupation attribute. For example, when the uplink carrier needs to be preempted, the CCA can be performed in the unlicensed carrier configured as the uplink occupied attribute to preempt the uplink carrier in the unlicensed carrier of the uplink occupied attribute; The CCA is performed on the unlicensed carrier of the attribute to preempt the downlink carrier in the unlicensed carrier of the downlink occupied attribute.

In this embodiment, the uplink occupation attribute and the downlink occupation attribute of different unlicensed carriers are separately configured and configured, and can be based on The uplink and downlink carriers are preempted independently by the uplink and the occupied attributes of the different unlicensed carriers, which not only narrows the preemption range of the uplink and downlink carriers in different unlicensed carriers, but also does not make the uplink and downlink carriers of the unlicensed carrier. The preemption has a competing effect, and the probability of simultaneously preempting the uplink and downlink carriers for data transmission in the unlicensed carrier is improved, and the preemption of the uplink and downlink carriers in the unlicensed carrier is more efficiently realized.

Optionally, in other embodiments, the foregoing step S10 may include:

And grouping the preset unassigned carriers, where the packet includes an uplink carrier group, a downlink carrier group, and/or an uplink and downlink carrier group; wherein, the carrier in the uplink carrier group is used for preemption of an uplink carrier; and the downlink carrier group The carrier in the uplink carrier is used for preemption of the downlink carrier, and the carrier in the uplink and downlink carrier group is used for preemption of the uplink and/or downlink carrier.

In this embodiment, when there are N candidate available unlicensed carriers, the N unlicensed carriers may be grouped, the M1 unlicensed carriers are selected as the uplink carrier group, and the M2 unlicensed carriers are selected as the downlink carrier group, where The M1 unlicensed carriers in the uplink carrier group and the M2 unlicensed carriers in the downlink carrier group do not cross each other. And M1 carriers in the uplink carrier group are used for uplink data transmission; and M2 carriers in the downlink carrier group are used for downlink data transmission. That is, the M1 carriers in the uplink carrier group are used for uplink data transmission for uplink transmission, and the M2 carriers in the downlink carrier group are used for subsequent downlink transmission for downlink data transmission.

Optionally, an uplink and downlink carrier group may be configured in a preset number of unlicensed carriers, and the M3 unlicensed carriers in the uplink and downlink carrier group may be flexibly and dynamically configured according to the change of the uplink and downlink services. The M3 carriers in the row carrier group can be used for subsequent uplink transmission for uplink data transmission, and for subsequent downlink transmission for downlink data transmission.

Optionally, in order to enhance the flexibility of the unlicensed carrier preemption, after the unlicensed carriers are divided into the uplink carrier group and the downlink carrier group, the time slot of the carrier in the uplink carrier group may also be configured with a preset downlink time. And configuring a preset uplink time slot for the time slot of the carrier in the downlink carrier group. The M1 carriers in the uplink carrier group can only be used for uplink data transmission for subsequent uplink transmission, and cannot use the M1 carriers in the uplink carrier group to transmit some short pre-assisted data scheduling. The downlink auxiliary signal is set. Therefore, by configuring a preset downlink time slot for the time slot of the carrier in the uplink carrier group, the carrier in the preset downlink time slot of the uplink carrier group can be used to perform preset downlink assistance. Signal transmission. Similarly, by configuring a preset uplink time slot for the time slot of the carrier in the downlink carrier group, the carrier in the preset uplink time slot of the downlink carrier group can be used to perform the preset uplink auxiliary signal. transmission.

In this embodiment, the uplink occupied attribute and the downlink occupied attribute of the unlicensed carrier may be configured by the base station eNB. After the configuration is complete, the configuration information, such as the uplink occupied attribute and the downlink occupied attribute, is sent to the user equipment UE. The packet configuration information of the authorized carrier is notified to the UE. Optionally, the eNB may also notify the neighboring base station and/or other non-LTE systems, such as a Wi-Fi system, etc., the packet configuration information, or may notify the packet configuration information by the UE. To neighboring base stations and/or other non-LTE systems.

Optionally, the foregoing step S20 may include:

Performing an idle channel evaluation on the carrier in the uplink carrier group, using a carrier lower than the preset channel estimation threshold or the channel idle state in the uplink carrier group as an uplink carrier, and preempting the uplink carrier; The carrier in the downlink carrier group performs the idle channel estimation, and the carrier in the downlink carrier group that is lower than the preset channel estimation threshold or in the channel idle state is used as the downlink carrier, and the downlink carrier is preempted.

The step of performing preemption of the uplink carrier and the downlink carrier on the preset unlicensed carrier according to the configured uplink occupation attribute and the downlink occupation attribute includes:

In this embodiment, after completing the packet configuration of the plurality of unlicensed carriers, the eNB and/or the UE perform the idle channel assessment on the M1 carriers in the uplink carrier group and the M2 carriers in the downlink carrier group. The CCA is executed to preempt the uplink carrier and the downlink carrier to perform uplink data and downlink data transmission.

Specifically, when the uplink carrier is preempted, the UE performs CCA on the M1 carriers in the uplink carrier group based on the eNB configuration information, that is, performs CCA, and lowers the preset channel estimation threshold in the uplink carrier group. Or the carrier in the channel idle state is used as the uplink carrier, and preempts the uplink carrier for the uplink signal transmission of the UE. Performing CCA by the UE is beneficial to solve the hidden node problem around the UE. The CCA may also perform CSP for resource preemption of the uplink carrier, and then used for scheduling of uplink signal transmission. When the downlink carrier is preempted, the eNB performs CCA on the M2 carriers in the downlink carrier group based on the configuration information, and the carrier in the downlink carrier group that is lower than the preset channel estimation threshold or in the channel idle state is used as the downlink carrier. And preempting the downlink carrier for transmitting the downlink signal of the eNB. Performing CCA by the eNB is advantageous for solving the hidden node problem around the eNB, and is also beneficial for the eNB to quickly perform the occupation and scheduling of the unlicensed carrier. The UE assists the eNB to perform CCA to perform resource preemption of the downlink carrier, and then is used for scheduling of downlink signal transmission. The UE assisted CCA facilitates the UE to discover neighboring hidden nodes, thereby effectively avoiding possible interference problems of hidden nodes.

For the preemption of the M3 unlicensed carriers in the uplink and downlink carrier groups, in an implementation manner, the eNB may semi-statically or dynamically configure the uplink/downlink attributes of the M3 carriers in the uplink and downlink carrier groups, the eNB and/or the UE. The CCA is performed on the M3 carriers in the uplink and downlink carrier groups based on the configuration information, and the carrier in the uplink and downlink carrier group that is lower than the preset channel estimation threshold or in the channel idle state is used as the uplink/downlink carrier, and is used for the uplink/downlink carrier. Downstream signal transmission. The preemption mode of the uplink/downlink carrier is simple, and the uplink and downlink coordination is convenient. In another implementation manner, the eNB and the UE may perform CCA respectively, and when there is no uplink transmission requirement currently, the UE may not perform CCA; when there is no downlink transmission requirement currently, the eNB may not perform CCA. If the eNB finds that the unlicensed carrier in the uplink and downlink carrier group is idle, but the UE finds that the UE is busy or the UE does not have an uplink transmission request, the eNB may occupy the downlink carrier for downlink signal transmission; if the UE finds the uplink and downlink carrier group The unlicensed carrier is idle, but the eNB finds that the eNB is busy or the eNB does not currently have the downlink transmission requirement, and then the uplink carrier is used for the uplink signal transmission; when both the UE and the eNB find that the unlicensed carrier in the uplink and downlink carrier group is idle, The carrier occupancy selection in the downlink carrier group can be as follows:

1. Determine the uplink/downlink occupied time slot and the occupation duration based on the eNB scheduling. It can be scheduled to only occupy downlink or only uplink;

2. In the current unoccupied carrier occupation period of the uplink and downlink carrier group, the downlink occupied time slot/subframe is configured by default, and the eNB scheduling information further determines the total duration of the current occupation, the duration of each uplink and downlink occupation, and the upper and lower Line switching time point. To simplify the complexity, one or more of the following parameters may be pre-configured: a fixed total occupied duration, a fixed upper and lower time configuration ratio, and a time point of uplink and downlink switching;

3. Pre-configuring the eNB and the UE to discover that the uplink and downlink are available, and only for downlink occupation;

4. If there is a periodic signal with a higher uplink priority at this time, the uplink is occupied by default, or the time slot in which the uplink periodic signal is located is preferentially allocated as the uplink of the unlicensed carrier in the uplink and downlink carrier group. If the periodic signal with a higher downlink priority needs to be sent at this time, the default downlink occupancy or the time slot in which the downlink periodic signal is located is preferentially allocated as the non-transmission in the uplink and downlink carrier group. The downlink time slot of the authorized carrier.

Optionally, in order to enhance the flexibility of the unlicensed carrier preemption, after the unlicensed carriers are divided into the uplink carrier group and the downlink carrier group, the time slot of the carrier in the uplink carrier group is also configured with a preset downlink time slot. And configuring a preset uplink time slot for the time slot of the carrier in the downlink carrier group. In this way, the M1 carriers in the uplink carrier group can not only perform subsequent uplink data scheduling for the uplink carrier, but also use the carrier in the uplink carrier group to transmit the preset downlink auxiliary signal. The preset downlink time slot configured in the uplink carrier group is generally configured as a periodic downlink time slot resource, and the downlink time slot resource is not occupied as an uplink time slot, and the carrier transmission using the preset downlink time slot is used. The preset downlink auxiliary signal is generally used for transmitting the downlink cell discovery signal and/or the reserved signal, etc., and the discovery signal can be used for carrier/cell discovery and measurement, and the reserved signal can assist the UE carrier occupation reservation. Similarly, the M2 carriers in the downlink carrier group can be used for downlink data scheduling in the downlink carrier group, and can also use the carrier in the downlink carrier group to transmit the preset uplink assistance. The signal, where the preset uplink time slot configured in the downlink carrier group is generally configured as a periodic uplink time slot resource, and the uplink time slot resource is not occupied as a downlink time slot. For example, a part of the preset uplink time slot is configured in the downlink carrier group, and a preset uplink assistance signal such as an SRS measurement signal is sent by using the carrier in the downlink carrier group in the preset uplink time slot, and the eNB obtains the channel reciprocity based on the channel reciprocity. Channel information, assisting the scheduling transmission of the downlink data channel.

Optionally, in other embodiments, the foregoing step S10 may include:

In this embodiment, each candidate unlicensed carrier is configured by a time slot, and the time slot of each unlicensed carrier is configured to include an uplink time slot, a downlink time slot, and/or an uplink and downlink time slot. When the uplink data needs to be transmitted, the idle channel is evaluated for the unlicensed carrier in the uplink time slot, and the carrier that is lower than the preset channel estimation threshold or the channel idle state in the unlicensed carrier in the uplink time slot is used as the uplink carrier, and The uplink carrier is preempted for uplink data transmission; when downlink data needs to be transmitted, the idle channel is evaluated for the unlicensed carrier in the downlink time slot, and the unlicensed carrier in the downlink time slot is lower than the preset channel estimation threshold. Or the carrier in the channel idle state is used as the downlink carrier, and the downlink carrier is preempted for downlink data transmission. The unlicensed carrier in the uplink and downlink time slots can be preempted as an uplink carrier or preempted as a downlink carrier.

Optionally, the uplink time slot of each unlicensed carrier may be further divided into an uplink short time slot and an uplink long time slot, where the duration of the uplink short time slot is smaller than the uplink long time slot, and the uplink short time slot is not. The authorized carrier is used for transmitting uplink control information; the unlicensed carrier in the uplink long time slot is used for transmitting uplink user data; and the downlink time slot of each unlicensed carrier is divided into a downlink short time slot and a downlink long time slot, wherein, the downlink is The duration of the short time slot is smaller than the downlink long time slot, and the unlicensed carrier in the downlink short time slot is used to transmit the downlink control information; the unlicensed carrier in the downlink long time slot is used to transmit the downlink user data.

Optionally, the foregoing step S20 may further include:

When the uplink user data needs to be transmitted, the idle channel is evaluated on the unlicensed carrier in the uplink long time slot, and the unlicensed carrier in the uplink long time slot is lower than the preset channel estimation threshold or the channel idle state. As the uplink carrier, the uplink carrier is preempted; when the downlink user data needs to be transmitted, the idle channel is evaluated for the unlicensed carrier in the downlink long time slot, and the unlicensed carrier in the downlink long time slot is lower than the preset. The channel evaluation threshold or the unlicensed carrier in the channel idle state is used as the downlink carrier, and the downlink carrier is preempted.

When the uplink control information needs to be transmitted, the unlicensed carrier in the uplink short time slot is used as the uplink carrier, and the uplink carrier is preempted. When the downlink control information needs to be transmitted, the unlicensed carrier in the downlink short time slot is used as the downlink. Carrier, and preemption of the downlink carrier.

Specifically, an unlicensed carrier A is configured, and the eNB configures the unlicensed carrier A to include an uplink time slot T_UL, a downlink time slot T_DL, and an uplink and downlink time slot T_UL_DL. Optionally, the uplink time slot T_UL is divided into an uplink short time slot T_UL_1 and an uplink long time slot T_UL_2, and the downlink time slot T_DL is divided into a downlink short time slot T_DL_1 and a downlink long time slot T_DL_2. T_UL_1 and T_UL_2 are independently configured, and T_DL_1 and T_DL_2 are independently configured. The uplink time slot T_UL is only used for uplink signal transmission, the downlink time slot T_DL is only used for downlink signal transmission, and T_UL_DL is used for uplink and downlink signal transmission.

T_UL_1 is an uplink short time slot for the transmission of necessary uplink control information such as various control signals and/or reference signals. T_UL_1 can be configured as 0, that is, the uplink short time slot is not configured. For example, in a scenario where short control signalling (SCS) is allowed to be configured, only 50% of the time required by the SCS is used in the 50 ms observation period. At T_UL_1. In an implementation manner, the uplink short time slot T_UL_1 may send the necessary uplink signal without performing CCA, and may timely send important uplink control information, such as various control signals and/or reference signals, to the eNB. Improve system performance. The uplink short time slot T_UL_1 is generally configured to appear periodically. In another implementation manner, the CCA occupied carrier may be used for transmission of uplink control information, and only the uplink short time slot T_UL_1 is occupied at a time. The CCA is generally performed by the UE to preempt the uplink short time slot T_UL_1. The eNB may assist the UE to perform CCA and assist the UE in solving the hidden node problem in the uplink transmission signal.

Similarly, T_DL_1 is a downlink short time slot for the transmission of necessary downlink control information such as various control signals and/or reference signals. T_DL_1 can be configured as 0, that is, the downlink short time slot is not configured. For example, in a scenario where SCS is allowed to be configured, only less than 5% of the time is used for T_DL_1 in the 50 ms observation period as required by the SCS. In an embodiment, the downlink short time slot T_DL_1 may send the necessary downlink signal without performing CCA, and timely transmit important downlink control information, such as various control signals and/or reference signals, to the UE in time. Improve system performance. The downlink short time slot T_DL_1 is generally configured to appear periodically. In another implementation manner, the CCA occupied carrier may be used for transmission of downlink control information, and only the downlink short time slot T_DL_1 is occupied at a time. The CCA is generally performed by the eNB to preempt the downlink short time slot T_DL_1. The UE may assist the eNB in performing CCA and assist the eNB in solving the hidden node problem in the downlink transmission signal.

The T_UL_1 and T_DL_1 slots can be separately configured for the uplink control information transmission, and there is no downlink T_UL_1 time slot configuration requirement; or the T_DL_1 time slot can be separately configured for downlink control information transmission, and no downlink T_DL_1 time slot configuration. Requirements, such as transmitting downlink discovery signals for cell discovery. The T_UL_2 and T_DL_2 slots are used for the transmission of uplink and downlink user data, respectively, and the duration of the continuous occupation is generally greater than the T_UL_1 and T_DL_1 slots. The relationship between T_UL_2 and T_DL_2 slots is as follows:

1. The T_UL_2 and T_DL_2 time slots are independently configured with each other in a non-overlapping time period, and are independently occupied. For example, the eNB performs CCA occupation of the T_DL_2 time slot, and the UE performs CCA occupation of the T_UL_2 time slot. This configuration is more flexible and does not require processing of the coordination relationship between the T_UL_2 and T_DL_2 slots.

2. The frame structure of the T_UL_2 and T_DL_2 slots is continuously bound, for example, the configured frame structure is: T_UL_2 slot plus T_DL_2 slot; or T_DL_2 slot plus T_UL_2 slot. It is generally preferred to adopt a TDD frame structure of LTE. Optionally, to improve the utilization of the unlicensed carrier resources, the part of the predetermined uplink time slot may be configured to be reconfigured to be downlink, or the part of the scheduled downlink time slot may be reconfigured to be uplink. The eNB and/or the UE are preempted according to the configured uplink and downlink timeslots. The unlicensed carriers in the uplink time slot are not preempted as downlink carriers, and the unlicensed carriers in the downlink time slots are not preempted as uplink carriers.

If there is a coincidence between the T_UL_1 slot and the T_UL_2 slot, the configuration uses the T_UL_2 slot. For the T_UL_1 time slot, the signal that needs to be transmitted at this time has the following candidate processing methods:

(1) The signal to be transmitted at the time of the T_UL_1 time slot can be transmitted in the T_UL_2 time slot, and the signal that needs to be transmitted in the T_UL_1 time slot is not interrupted as much as possible, so that the reliability of the T_UL_1 time slot needs to be transmitted.

(2) Interrupt the signal of the T_UL_1 time slot that needs to be transmitted. Because the T_UL_2 time slot also needs to transmit the uplink user data that needs to be transmitted, if the T_UL_1 time slot signal is transmitted at the same time, it will affect the uplink user data transmission of the T_UL_2 time slot, such as the impact of resource overhead.

The eNB explicitly or implicitly notifies the UE of the above-mentioned manner of transmission, so that the UE performs uplink signal transmission according to the configuration mode of the eNB, and the eNB receives and processes the uplink signal sent by the UE according to the configuration manner.

Similarly, if there is a coincidence between the T_DL_1 slot and the T_DL_2 slot, the configuration uses the T_DL_2 slot. For the T_DL_1 time slot, the signal that needs to be transmitted at this time has the following candidate processing methods:

(1) The signal to be transmitted in the T_DL_1 time slot can be transmitted in the T_DL_2 time slot, and the signal that needs to be transmitted in the T_DL_1 time slot is not interrupted as much as possible, so that the reliability of the T_DL_1 time slot needs to be transmitted.

(2) Interrupt the signal of the T_DL_1 time slot that needs to be transmitted. Because the T_DL_2 time slot also needs to transmit the downlink user data that needs to be transmitted, if the T_DL_1 time slot signal is transmitted at the same time, it will affect the downlink user data transmission of the T_DL_2 time slot, such as the impact of resource overhead.

The eNB explicitly or implicitly notifies the UE to transmit in the above manner, so that the eNB performs downlink signal transmission according to the configuration mode, and the UE receives the downlink signal sent by the processing eNB according to the eNB configuration mode.

If there is a coincidence between the T_UL_1 slot and the T_DL_2 slot, the following signals are required for the signal to be transmitted for the T_UL_1 slot:

(1) The configuration uses the T_DL_2 time slot to interrupt the signal that needs to be transmitted at the time of the T_UL_1 time slot. Because the signal transmitted by the T_UL_1 time slot is generally uplink control information such as a measurement reference signal, and the terminal transmits a certain time, the last history information may be utilized, or the signal of the next transmission may be used for measurement. It can fully utilize the T_DL_2 time slot to transmit more downlink user data.

(2) The general T_DL_2 slot duration is greater than the T_UL_1 slot. The configuration uses the T_DL_2 slot, but at the same time reserves part of the time in the T_DL_2 slot for the T_UL_1 slot. Generally, the T_UL_1 slot position is configured in the T_DL_2 slot according to the preset period position, and the time for the uplink and downlink handover of the UE and the eNB needs to be configured. This method does not affect the signal transmitted by the T_UL_1 time slot, and provides more opportunities for configuring the T_DL_2 time slot transmission.

If there is a coincidence between the T_DL_1 slot and the T_UL_2 slot, the following signals are required for the signal to be transmitted for the T_DL_1 slot:

(1) The configuration uses the T_UL_2 time slot to interrupt the signal that needs to be transmitted at the time of the T_DL_1 time slot. Because the signal transmitted by the T_DL_1 time slot is downlink control information such as a measurement reference signal, etc., the terminal can transmit the previous history information or use the next transmission signal measurement. It can fully utilize the T_UL_2 time slot to transmit more uplink user data.

(2) The general T_UL_2 slot duration is greater than the T_DL_1 slot. The configuration uses the T_UL_2 slot, but at the same time reserves part of the time in the T_DL_2 slot for the T_DL_1 slot. Generally, the T_DL_1 slot position is configured in the T_UL_2 slot according to the preset period position, and the time for the uplink and downlink handover of the UE and the eNB needs to be configured. This mode does not affect the signal transmitted by the T_DL_1 time slot, and provides more opportunities to configure the T_UL_2 time slot transmission.

It should be noted that, in this embodiment, the T_DL_2 time slot and the T_UL_1 time slot are not overlapped, and the T_UL_2 time slot and the T_DL_1 time slot are not overlapped, thereby reducing the impact between different time slots and reducing the implementation complexity. . Above Each time slot configuration may be re-adjusted based on changes in uplink and downlink traffic requirements, and the UE is notified by the eNB.

Optionally, the eNB and/or the UE perform CCA according to a preset time slot allocation structure, such as configured uplink time slot, downlink time slot, and uplink short time slot, uplink long time slot, downlink short time slot, and downlink long time slot. The preemption of the uplink carrier and the downlink carrier is performed. The unlicensed carrier in the uplink time slot is only used as the uplink carrier and is used for uplink data transmission; the unlicensed carrier in the downlink time slot is only occupied as the downlink carrier and used for downlink data transmission. If the unlicensed carrier of the configured uplink time slot is not occupied as the uplink carrier, the eNB and/or the UE will not occupy the uplink time slot as the downlink time slot. Similarly, if the configured non-authorized carrier of the downlink time slot does not exist, It is occupied as a downlink carrier, and the eNB and/or the UE do not occupy the downlink time slot as a downlink time slot. For example, the time slot structure configured for the uplink time slot and the downlink time slot is 10 ms in total, the first 5 ms is reserved for the downlink time slot, and the last 5 ms is reserved for the uplink. If the first 5 ms is not occupied as a downlink carrier, the 0-5 ms blank of the slot structure is not occupied, and only 6-10 ms can be preempted as an uplink carrier.

For T_DL_2 slots, CCA listening and preemption are typically performed by the eNB. If the eNB performs CCA discovery that the unlicensed carrier in the T_DL_2 slot satisfies the CCA threshold, it is occupied as a downlink carrier and used for downlink data transmission. The eNB may configure the UE to assist in performing CCA detection of the T_DL_2 slot, and the auxiliary eNB determines whether to occupy the T_DL_2 slot. If the T-DL_2 time slot CCA detection is found to be unavailable, the eNB will not perform CCA interception and preemption as the downlink occupied time slot in the time slot configured as T_UL_2, but will attempt to perform CCA and unlicensed carrier preemption in the next T_DL_2 time slot. For downlink data transmission.

For the T_UL_2 slot, CCA listening and preemption are generally performed by the UE. If the UE performs the CCA discovery that the unlicensed carrier in the T_UL_2 slot satisfies the CCA threshold, it is occupied as an uplink carrier and used for uplink data transmission. The system may configure the eNB to assist in performing CCA detection of the T_UL_2 slot, and assist in determining whether to occupy the T_UL_2 slot. If the T-UL_2 time slot CCA detection is found to be unavailable, the UE will not perform CCA interception and preemption as the uplink occupied time slot in the time slot preconfigured as T_DL_2, but will attempt to perform CCA and unlicensed carrier in the next T_UL_2 time slot. Preemption for uplink data transmission.

Optionally, if the T_DL_1 or T_UL_1 time slot is configured in a certain T_DL_2 time slot, it may be configured to try CCA and perform preemption at the T_DL_2 slot position; or perform CCA in an area where CCA is not enforced and/or the SCS is allowed to be sent. Directly occupying the T_DL_1 or T_UL_1 time slot and transmitting the signal transmitted by the T_DL_1 or T_UL_1 time slot. If the T_DL_1 or T_UL_1 time slot is configured in a certain T_UL_2 time slot, it can be configured to try CCA and perform preemption at the T_UL_2 time slot position; or in the area where CCA is not enforced and/or the SCS is allowed to be sent, the CCA is not executed, and is directly occupied as T_DL_1 or T_UL_1 time slot, and send the signal sent by the T_DL_1 or T_UL_1 time slot. In particular, when the T_UL_2/T_DL_2 time slot is not preempted and blank, the T_DL_2/T_UL_2 time slot cannot be preempted, but the preemption is T_DL_1 or T_UL_1 time slot.

Through the foregoing method, the T_UL_1 and/or T_DL_1 time slots are preferentially preempted, and can be used for uplink and downlink control information, such as various short control information and/or reference signal transmission, transmitted in the T_DL_1 time slot and/or the T_DL_1 time slot. It is used to ensure the timeliness and reliability of such signal transmission, thereby improving system performance.

Optionally, in other embodiments, the foregoing step S10 may include:

Configure a control channel of the unlicensed carrier in the downlink subframe structure based on the configured downlink time slot, that is, the LTE downlink subframe structure The domain performs CCA and sends data in the data domain. The number of control domain symbols can be configured based on the number of control domain symbols of the authorized carrier of the unlicensed carrier to reduce the complexity of the configuration. For example, the number of control domain carriers is the same as that of the authorized carrier, or the fixed phase difference is n, n ∈ {1, 2, 3, 4}. Or fixedly configuring the number of control domain symbols to N, N ∈ {1, 2, 3, 4}.

Optionally, the C domain preemption is performed only in the control domain of the first subframe of the K subframes, and the data is scheduled to be sent in the K subframes if the occupation is successful. Then, the CCA preemption is performed in the time slots after the K subframes; or the preemption is performed in the 1, 2, ..., k subframes of the K subframes. If the preemption in the subframe 1 is successful, the K subframes are continuously occupied. If the preemption of the subframe 1 is unsuccessful, the preemption is attempted in the subframe 2. If the preemption succeeds, the subsequent K-1 subframes are continuously occupied (or the subsequent K subframes are continuously occupied), and so on. The first preemption mode reduces the complexity, but the preemption probability is low; the second preemption mode takes up an opportunity, but the complexity is high.

Or, based on the configured uplink time slot, that is, the LTE uplink subframe structure, configuring the unlicensed carrier to perform CCA on the last OFDM symbol of the uplink subframe structure. Optionally, for the configuration, the K subframes are consecutively occupied, and the last OFDM symbol in the previous subframe of the first subframe of the K subframes is configured to perform CCA preemption. If the occupation succeeds, the data is scheduled to be sent in the subsequent K subframes. If the success is not occupied, the CCA preemption is performed again in the time slots after the K subframes; or in the last OFDM symbol of the previous subframe of the 1, 2, ..., k subframe in the K subframes. Preemption, if the preemption of the subframe 1 is successful, the K subframes are occupied continuously. If the preemption of the subframe 1 is unsuccessful, the preemption is performed in the subframe 2. If the preemption succeeds, the subsequent K-1 subframes are continuously occupied (or the subsequent K-1 subframes are continuously occupied). K sub-frames, and so on. The first method above reduces the complexity, but the preemption probability is low; the second method takes up an opportunity, but the complexity is high.

Optionally, in other embodiments, the foregoing step S10 may include:

The L subframes that are continuously occupied are configured, and at least the first subframe that is successfully preempted is a downlink subframe. After the first subframe is successfully preempted, the uplink and downlink timeslot configuration information of the subsequent L subframes is dynamically indicated. Optionally, the indication information is carried by the first downlink subframe of the unlicensed carrier.

It should be noted that, the uplink short time slot and the uplink long time slot satisfy the following condition: when the uplink short time slot overlaps with the uplink long time slot, send an uplink long time slot signal; Upstream short time slot signal, or interrupting the uplink short time slot signal transmission;

The method further includes: the user equipment UE receives or does not receive the downlink short slot signal based on a default configuration or a display indication; the UE is based on a default configuration or a display indication, based on the downlink short-slot signal and the uplink short-slot signal. The uplink short-slot signal is transmitted or not transmitted.

The invention optionally provides a base station that preempts an unlicensed carrier.

Referring to FIG. 2, FIG. 2 is a schematic diagram of functional modules of an embodiment of a base station for preempting an unlicensed carrier according to the present invention.

In an embodiment, the base station that preempts the unlicensed carrier includes:

The configuration module 01 is configured to configure an uplink occupied attribute and a downlink occupied attribute of the preset unlicensed carrier.

The preemption module 02 is configured to perform preemption of the uplink carrier and the downlink carrier on the preset unlicensed carrier according to the configured uplink occupation attribute and the downlink occupation attribute.

In this embodiment, the uplink and downlink carriers are separately occupied based on the uplink occupied attributes and the downlink occupied attributes of different unlicensed carriers, and the uplink and downlink carriers are preempted independently. The preemption range of the uplink and downlink carriers in the authorized carrier does not cause the uplink and downlink carrier preemption of the unlicensed carrier to compete with each other, and the uplink and downlink carriers are simultaneously preempted for data transmission in the unlicensed carrier. Probability, more efficient implementation of preemption of uplink and downlink carriers in unlicensed carriers.

Optionally, in other embodiments, the foregoing configuration module 01 may be configured to:

In this embodiment, when there are N candidate available unlicensed carriers, the N unlicensed carriers may be grouped, the M1 unlicensed carriers are selected as the uplink carrier group, and the M2 unlicensed carriers are selected as the downlink carrier group, where The M1 unlicensed carriers in the uplink carrier group and the M2 unlicensed carriers in the downlink carrier group do not cross each other. And M1 carriers in the uplink carrier group are used for uplink data transmission; and M2 carriers in the downlink carrier group are used for downlink data transmission. That is, the M1 carriers in the uplink carrier group are used for subsequent preemption as uplink carriers for uplink data transmission; The M2 carriers in the wave group are used for subsequent preemption as downlink carriers for downlink data transmission.

Optionally, the preemption module 02 may be configured to:

Specifically, when the uplink carrier is preempted, the UE performs CCA on the M1 carriers in the uplink carrier group based on the eNB configuration information, that is, performs CCA, and lowers the preset channel estimation threshold in the uplink carrier group. Or the carrier in the channel idle state is used as the uplink carrier, and preempts the uplink carrier for the uplink signal transmission of the UE. Performing CCA by the UE is beneficial to solve the hidden node problem around the UE. The CCA may also perform CSP for resource preemption of the uplink carrier, and then used for scheduling of uplink signal transmission. When the downlink carrier is preempted, the eNB performs CCA on the M2 carriers in the downlink carrier group based on the configuration information, and the downlink carrier group is lower than the preset channel estimation threshold or The carrier in the channel idle state is used as the downlink carrier, and the downlink carrier is preempted for the downlink signal transmission of the eNB. Performing CCA by the eNB is advantageous for solving the hidden node problem around the eNB, and is also beneficial for the eNB to quickly perform the occupation and scheduling of the unlicensed carrier. The UE assists the eNB to perform CCA to perform resource preemption of the downlink carrier, and then is used for scheduling of downlink signal transmission. The UE assisted CCA facilitates the UE to discover neighboring hidden nodes, thereby effectively avoiding possible interference problems of hidden nodes.

Optionally, the preemption module is further configured to: perform idle channel estimation on a carrier in the uplink carrier group and a carrier in a downlink carrier group, where the carrier in the uplink carrier group and the downlink carrier group When the carriers are available, the carrier in the uplink carrier group or the carrier occupied time slot and the occupied duration in the downlink carrier group are determined according to the scheduling of the eNB, and the carriers in the downlink carrier group are preempted or Preemption of carriers in the uplink carrier group; or,

Optionally, the uplink time slot of each unlicensed carrier may be further divided into an uplink short time slot and an uplink long time slot, where the duration of the uplink short time slot is smaller than the uplink long time slot, and the uplink short time slot is not. The authorized carrier is used to transmit uplink control information; The unlicensed carrier in the uplink long time slot is used to transmit the uplink user data; the downlink time slot of each unlicensed carrier is divided into the downlink short time slot and the downlink long time slot, wherein the duration of the downlink short time slot is less than the downlink long time interval. The unlicensed carrier in the downlink short time slot is used to transmit downlink control information; the unlicensed carrier in the downlink long time slot is used to transmit downlink user data.

Optionally, the preemption module 02 is further configured to:

T_UL_1 is an uplink short time slot for the transmission of necessary uplink control information such as various control signals and/or reference signals. T_UL_1 can be configured as 0, that is, the uplink short time slot is not configured. For example, in a scenario where short control signalling (SCS) is allowed, only less than 5% of the time required for SCS is used for T_UL_1 in the 50 ms observation period. In an implementation manner, the uplink short time slot T_UL_1 may send the necessary uplink signal without performing CCA, and may timely send important uplink control information, such as various control signals and/or reference signals, to the eNB. Improve system performance. The uplink short time slot T_UL_1 is generally configured to appear periodically. In another implementation manner, the CCA occupied carrier may be used for transmission of uplink control information, and only the uplink short time slot T_UL_1 is occupied at a time. The CCA is generally performed by the UE to preempt the uplink short time slot T_UL_1. The eNB may assist the UE to perform CCA and assist the UE in solving the hidden node problem in the uplink transmission signal.

The above T_UL_1 and T_DL_1 slots can be separately configured with T_UL_1 slots for uplink control information transmission. There is a downlink T_UL_1 time slot configuration requirement; or the T_DL_1 time slot can be separately configured for downlink control information transmission, and there is no downlink T_DL_1 time slot configuration requirement, for example, transmitting a downlink discovery signal for cell discovery. The T_UL_2 and T_DL_2 slots are used for the transmission of uplink and downlink user data, respectively, and the duration of the continuous occupation is generally greater than the T_UL_1 and T_DL_1 slots. The relationship between T_UL_2 and T_DL_2 slots is as follows:

If there is a coincidence between the T_UL_1 slot and the T_DL_2 slot, the signal that needs to be transmitted for the T_UL_1 slot has The following candidate processing methods:

It should be noted that, in this embodiment, the T_DL_2 time slot and the T_UL_1 time slot are not overlapped, and the T_UL_2 time slot and the T_DL_1 time slot are not overlapped, thereby reducing the impact between different time slots and reducing the implementation complexity. . The foregoing time slot configuration may re-adjust the configuration based on the change of the uplink and downlink service requirements, and notify the UE by the eNB.

For T_DL_2 slots, CCA listening and preemption are typically performed by the eNB. If the eNB performs CCA discovery that the unlicensed carrier in the T_DL_2 slot satisfies the CCA threshold, it is occupied as a downlink carrier and used for downlink data transmission. The eNB may configure the UE to assist in performing CCA detection of the T_DL_2 slot, and the auxiliary eNB determines whether to occupy the T_DL_2 slot. If this time The T_DL_2 slot CCA detection is not available. The eNB does not perform CCA snooping and preemption as the downlink occupied time slot in the time slot configured as T_UL_2, but attempts to perform CCA and unlicensed carrier preemption in the next T_DL_2 time slot. Downstream data transmission.

Based on the configured downlink time slot, that is, the LTE downlink subframe structure, the unlicensed carrier is configured to perform CCA in the control channel domain of the downlink subframe structure, and perform data transmission in the data domain. The number of control domain symbols can be configured based on the number of control domain symbols of the authorized carrier of the unlicensed carrier to reduce the complexity of the configuration. For example, the number of control domain carriers is the same as that of the authorized carrier, or the fixed phase difference is n, n ∈ {1, 2, 3, 4}. Or fixedly configuring the number of control domain symbols to N, N ∈ {1, 2, 3, 4}.

Or, based on the configured uplink time slot, that is, the LTE uplink subframe structure, configuring the unlicensed carrier to perform CCA on the last OFDM symbol of the uplink subframe structure. Optionally, for the configuration, the K subframes are consecutively occupied, and only the last OFDM symbol in the previous subframe of the first subframe of the K subframes is configured to perform CCA preemption, and if the occupation succeeds, the subsequent K subframes are performed. The subframe is scheduled to transmit data. If the occupation is not occupied, the CCA preemption is performed in the time slots after the K subframes; or the previous subframe of the 1, 2, ..., k subframes in the K subframes is configured. Preemption in the last OFDM symbol. If the preemption in subframe 1 succeeds, K subframes are continuously occupied. If the preemption of subframe 1 is unsuccessful, it attempts to preempt in subframe 2. If the preemption succeeds, the subsequent K-1 subframes are continuously occupied. Or continue to occupy subsequent K sub-frames, and so on. The first method above reduces the complexity, but the preemption probability is low; the second method takes up an opportunity, but the complexity is high.

The present invention further provides a system for preempting an unlicensed carrier.

Referring to FIG. 3, FIG. 3 is a schematic structural diagram of a system for preempting an unlicensed carrier according to an embodiment of the present invention.

In an embodiment, the system for preempting the unlicensed carrier includes: the base station 1 and the user equipment 2, wherein the base station 1 configures an uplink occupied attribute and a downlink occupied attribute of the preset unlicensed carrier; and the configured preset unlicensed carrier The uplink occupation attribute and the downlink occupation attribute are sent to the user equipment 2; the user equipment 2 receives the uplink occupation attribute and the downlink occupation attribute of the preset unlicensed carrier configured by the base station 1; and the base station 1 and/or the user equipment 2 are based on the configured uplink occupation attribute. And the downlink occupied attribute, the uplink carrier and the downlink carrier are preempted for the preset unlicensed carrier.

Specifically, the base station 1 configures an uplink occupied attribute and a downlink occupied attribute of the preset unlicensed carrier, and the base station 1 and/or the user equipment 2 performs uplink carrier and downlink on the preset unlicensed carrier based on the configured uplink occupied attribute and downlink occupied attribute. The process of preempting the carrier is as described above, and details are not described herein again.

After the base station 1 and/or the user equipment 2 complete the preemption of the uplink carrier and the downlink carrier, the user equipment 2 transmits the uplink data to the base station 1 based on the preempted uplink carrier, and the base station 1 also transmits the downlink data to the user equipment 2 based on the preempted downlink carrier. Thereby, uplink data and downlink data are transmitted between the base station 1 and the user equipment 2.

Optionally, in other embodiments, if the user equipment UE performs uplink CCA and uplink time slot or carrier occupation, and sends an occupation signal, there are cases where different UEs independently preempt and transmit the occupation signal. If the UE has data transmission, the preemption is performed, and the occupation signal is sent according to the configuration; other UEs that have no data transmission in the same cell may select the following processing manner:

(1) Configure a group of UEs to perform uplink CCA and carrier preemption, regardless of whether a UE needs to transmit signals in the current group. This simplifies the notification configuration of the UE performing CCA and carrier preemption, and also facilitates the base station eNB to perform better carrier measurement by means of the UE;

(2) UE grouping associated with the unlicensed carrier, the grouping principle may be based on service requirements, geographical distribution characteristics, etc. UE grouping is performed, for example, the UE is divided into group A and group B. The configuration group A and the group B respectively perform CCA and carrier preemption at different times of the unlicensed carrier, for example, group A is in an odd time period, and group B is in an even time period. The UEs in the group perform CCA and carrier preemption, regardless of whether a UE needs to transmit signals in the current group. This simplifies the notification configuration of the UE performing CCA and carrier preemption, and also facilitates the eNB to perform better carrier measurement by means of the UE;

(3) The UEs in the same cell that do not have data transmission do not perform CCA and carrier preemption, that is, only the UEs that have service requirements on the unlicensed carrier perform CCA and carrier preemption. This simplifies the coordination relationship between UEs.

Optionally, after the UE preempts the uplink carrier, the following candidate operation modes are as follows:

(1) After the UE transmits the uplink data, the UE releases the resource and no longer sends any signal. This will help release resources as soon as possible and reduce interference with others;

(2) After the UE transmits the uplink data, the UE does not release the resource, and continues to send the occupied signal, etc., to prevent other nodes from preempting the carrier until the expected occupation period ends. It is advantageous to occupy the uniformity of the frame structure and to facilitate timing coordination of different UEs.

(3) After the UE transmits the uplink data, the UE does not release the resource, and continues to send the occupied signal, etc., to keep the carrier occupied, and is used for measuring signal transmission. That is, although only the last OFDM symbol of the subframe is used to transmit the measurement signal, and other OFDM symbols are not signaled, the occupied state of the carrier is retained by occupying the signal. This will facilitate more opportunities to send measurement signals, which is beneficial to subsequent scheduling requirements.

In this embodiment, the uplink and downlink carriers are separately occupied based on the uplink occupied attributes and the downlink occupied attributes of different unlicensed carriers, and the uplink and downlink carriers are preempted independently. The preemption range of the uplink and downlink carriers in the authorized carrier does not cause the uplink and downlink carrier preemption of the unlicensed carrier to compete with each other, and the uplink and downlink carriers are simultaneously preempted for data transmission in the unlicensed carrier. Probability, more efficient implementation of preemption of uplink and downlink carriers in unlicensed carriers, and transmission of uplink data and downlink data between base station 1 and user equipment 2.

The serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments. Through the description of the above embodiments, those skilled in the art can clearly understand that the foregoing embodiment method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is better. Implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, The optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

The above is only an alternative embodiment of the present invention, and thus does not limit the scope of the invention, and the equivalent structure or equivalent process transformation made by using the specification and the drawings of the present invention, or directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Industrial applicability

The foregoing technical solution provided by the embodiment of the present invention is applied to the process of preempting the unlicensed carrier. In this process, the uplink occupation attribute and the downlink occupation attribute of different unlicensed carriers are separately configured, and the uplink occupation of different unlicensed carriers can be used. Attributes and downlink occupied attributes independently perform preemption of uplink and downlink carriers, which not only narrows the preemption range of uplink and downlink carriers in different unlicensed carriers, but also does not compel the uplink and downlink carrier preemption of unlicensed carriers. The probability of simultaneously preempting the uplink and downlink carriers for data transmission in the unlicensed carrier is improved, and the preemption of the uplink and downlink carriers in the unlicensed carrier is more efficiently realized.

Claims

A method for preempting an unlicensed carrier, the method for preempting the unlicensed carrier includes the following steps:

Configure the uplink occupation attribute and downlink occupation attribute of the preset unlicensed carrier.

The uplink carrier and the downlink carrier are preempted for the preset unlicensed carrier based on the configured uplink occupied attribute and the downlink occupied attribute.
The method for preempting an unlicensed carrier according to claim 1, wherein the step of configuring an uplink occupation attribute and a downlink occupation attribute of the preset unlicensed carrier includes:

And grouping the preset unassigned carriers, where the packet includes an uplink carrier group, a downlink carrier group, and/or an uplink and downlink carrier group; wherein, the carrier in the uplink carrier group is used for preemption of an uplink carrier; and the downlink carrier group The carrier in the uplink carrier is used for preemption of the downlink carrier, and the carrier in the uplink and downlink carrier group is used for preemption of the uplink and/or downlink carrier.
The method for preempting an unlicensed carrier according to claim 2, wherein the step of configuring the uplink occupied attribute and the downlink occupied attribute of the preset unlicensed carrier further includes:

Configuring a preset downlink time slot for the time slot of the carrier in the uplink carrier group, where the carrier in the preset downlink time slot is used for preset downlink auxiliary signal transmission;

A preset uplink time slot is configured for the time slot of the carrier in the downlink carrier group, and the carrier in the downlink carrier group that is in the preset uplink time slot is used for preset uplink auxiliary signal transmission.
The method for preempting an unlicensed carrier according to claim 3, wherein the downlink assist signal comprises: one or more downlink cell discovery signals, and/or one or more reserved signals; and the uplink assist signal comprises: One or more uplink sounding reference signals SRS.
The method for preempting an unlicensed carrier according to claim 2 or 3, wherein the step of performing preemption of the uplink carrier and the downlink carrier on the preset unlicensed carrier based on the configured uplink occupied attribute and the downlink occupied attribute includes:

Performing an idle channel assessment on the carrier in the uplink carrier group, using a carrier lower than the preset channel estimation threshold or the channel idle state in the uplink carrier group as an uplink carrier, and preempting the uplink carrier;

The carrier in the downlink carrier group is subjected to the idle channel estimation, and the carrier in the downlink carrier group that is lower than the preset channel estimation threshold or in the channel idle state is used as the downlink carrier, and the downlink carrier is preempted.
The method for preempting an unlicensed carrier according to claim 2 or 3, wherein the step of performing preemption of the uplink carrier and the downlink carrier on the preset unlicensed carrier based on the configured uplink occupied attribute and the downlink occupied attribute includes:

Performing idle channel estimation on the carrier in the uplink carrier group and the carrier in the downlink carrier group, and determining whether the carrier in the uplink carrier group and the carrier in the downlink carrier group are available, based on the scheduling of the base station eNB The carrier in the uplink carrier group or the carrier in the downlink carrier group occupies a time slot and an occupied duration, and preempts the carrier in the downlink carrier group or preempts the carrier in the uplink carrier group; or

Configuring a downlink occupied time slot or an unlicensed carrier in the uplink carrier group and the downlink carrier group Determining the total duration of the occupation, the duration of each of the uplink carrier group and the downlink carrier group, and the uplink and downlink handover time points; or pre-configuring one or more of the following parameters: a fixed total occupation Duration, fixed uplink and downlink time configuration ratios, time points for upstream and downstream switching; or,

When the carrier in the uplink carrier group and the downlink carrier group is pre-configured to be simultaneously available to the base station eNB and the terminal, the carrier in the downlink carrier group is preempted; or

When a periodic signal with a higher uplink priority needs to be sent, the carrier in the uplink carrier group is preempted, or the time slot in which the uplink periodic signal is located is preferentially allocated as the uplink carrier group and the downlink carrier group. The uplink time slot of the unlicensed carrier; when the periodic signal with a higher downlink priority needs to be transmitted, the carrier in the downlink carrier group is preempted, or the time slot in which the downlink periodic signal is located is preferentially allocated as the The downlink time slot of the unlicensed carrier in the downlink carrier group is described.
The method for preempting an unlicensed carrier according to claim 1, wherein the step of configuring an uplink occupation attribute and a downlink occupation attribute of the preset unlicensed carrier includes:

Configuring a time slot for each unlicensed carrier in the preset unlicensed carrier includes an uplink time slot, a downlink time slot, and/or an uplink and downlink time slot; wherein, the unlicensed carrier in the uplink time slot is used for preemption of the uplink carrier; The unlicensed carrier of the time slot is used for preemption of the downlink carrier; the unlicensed carrier of the uplink and downlink time slot is used for preemption of the uplink and/or downlink carrier.
The method for preempting an unlicensed carrier according to claim 7, wherein the step of performing preemption of the uplink carrier and the downlink carrier on the preset unlicensed carrier based on the configured uplink occupied attribute and the downlink occupied attribute includes:

Performing an idle channel evaluation on the unlicensed carrier in the uplink time slot, and using the carrier that is lower than the preset channel estimation threshold or the channel idle state in the unlicensed carrier in the uplink time slot as the uplink carrier, and preempting the uplink carrier;

The idle channel is evaluated for the unlicensed carrier in the downlink time slot, and the carrier that is lower than the preset channel estimation threshold or the channel idle state in the unlicensed carrier in the downlink time slot is used as the downlink carrier, and the downlink carrier is preempted.
The method for preempting an unlicensed carrier according to claim 7 or 8, wherein the step of configuring the uplink occupied attribute and the downlink occupied attribute of the preset unlicensed carrier further includes:

The uplink time slot of each unlicensed carrier is divided into an uplink short time slot and an uplink long time slot, wherein the duration of the uplink short time slot is smaller than the uplink long time slot, and the unlicensed carrier in the uplink short time slot is used for transmitting the uplink control. Information; an unlicensed carrier in an uplink long time slot is used to transmit uplink user data;

The downlink time slot of each unlicensed carrier is divided into a downlink short time slot and a downlink long time slot, wherein the duration of the downlink short time slot is smaller than the downlink long time slot, and the unlicensed carrier of the downlink short time slot is used for transmitting the downlink control Information; the unlicensed carrier in the downlink long time slot is used to transmit downlink user data.
The method for preempting an unlicensed carrier according to claim 9, wherein the step of performing preemption of the uplink carrier and the downlink carrier on the preset unlicensed carrier based on the configured uplink occupation attribute and the downlink occupation attribute includes:

When the uplink user data needs to be transmitted, the idle channel is evaluated on the unlicensed carrier in the uplink long time slot, and the unlicensed carrier in the uplink long time slot is lower than the preset channel estimation threshold or the channel idle state. As an uplink carrier, preempting the uplink carrier;

When the downlink user data needs to be transmitted, the idle channel is evaluated for the unlicensed carrier that is in the downlink long time slot, and the unlicensed carrier that is in the downlink long time slot is lower than the preset channel estimation threshold or the channel idle state. As a downlink carrier, the downlink carrier is preempted.
The method for preempting an unlicensed carrier according to claim 9, wherein the step of performing preemption of the uplink carrier and the downlink carrier on the preset unlicensed carrier according to the configured uplink occupation attribute and the downlink occupation attribute further includes:

When the uplink control information needs to be transmitted, the unlicensed carrier that is in the uplink short time slot is used as the uplink carrier, and the uplink carrier is preempted;

When the downlink control information needs to be transmitted, the unlicensed carrier that is in the downlink short time slot is used as the downlink carrier, and the downlink carrier is preempted.
The method for preempting an unlicensed carrier according to claim 9, wherein

The uplink short time slot and the uplink long time slot satisfy the following conditions:

And transmitting, when the uplink short time slot overlaps with the uplink long time slot, transmitting an uplink long time slot signal; transmitting the uplink short time slot signal, or interrupting the uplink short time slot signal transmission;

The uplink short time slot and the uplink long time slot satisfy the following conditions:

And when the downlink short time slot overlaps with the downlink long time slot, sending a downlink long time slot signal; transmitting the downlink short time slot signal, or interrupting the downlink short time slot signal transmission.
The method for preempting an unlicensed carrier according to claim 12, wherein the method further comprises:

The user equipment UE receives or does not receive the downlink short time slot signal based on a default configuration or a display indication;

The UE transmits or does not transmit the uplink short-slot signal based on a default configuration or a display indication.
A base station that preempts an unlicensed carrier, where the base station preempting an unlicensed carrier includes:

a configuration module, configured to configure an uplink occupied attribute and a downlink occupied attribute of the preset unlicensed carrier;

The preemption module is configured to perform preemption of the uplink carrier and the downlink carrier on the preset unlicensed carrier based on the configured uplink occupation attribute and the downlink occupation attribute.
The base station for preempting an unlicensed carrier according to claim 14, wherein the configuration module is further configured to:

And grouping the preset unassigned carriers, where the packet includes an uplink carrier group, a downlink carrier group, and/or an uplink and downlink carrier group; wherein, the carrier in the uplink carrier group is used for preemption of an uplink carrier; and the downlink carrier group The carrier in the uplink carrier is used for preemption of the downlink carrier, and the carrier in the uplink and downlink carrier group is used for preemption of the uplink and/or downlink carrier.
The base station for preempting an unlicensed carrier according to claim 14, wherein the configuration module is further configured to:

Configuring a preset downlink time slot for the time slot of the carrier in the uplink carrier group, where the carrier in the preset downlink time slot is used for preset downlink auxiliary signal transmission;

A preset uplink time slot is configured for the time slot of the carrier in the downlink carrier group, and the carrier in the downlink carrier group that is in the preset uplink time slot is used for preset uplink auxiliary signal transmission.
The base station for preempting an unlicensed carrier according to claim 16, wherein the downlink assist signal comprises: one or more downlink cell discovery signals, and/or one or more reserved signals; and the uplink assist signal comprises: One or more uplink sounding reference signals SRS.
The base station for preempting an unlicensed carrier according to claim 15 or 16, wherein the preemption module is further configured to:

Performing an idle channel assessment on the carrier in the uplink carrier group, using a carrier lower than the preset channel estimation threshold or the channel idle state in the uplink carrier group as an uplink carrier, and preempting the uplink carrier;

The carrier in the downlink carrier group is subjected to the idle channel estimation, and the carrier in the downlink carrier group that is lower than the preset channel estimation threshold or in the channel idle state is used as the downlink carrier, and the downlink carrier is preempted.
The base station for preempting an unlicensed carrier according to claim 15 or 16, wherein the preemption module is further configured to:

Performing idle channel estimation on the carrier in the uplink carrier group and the carrier in the downlink carrier group, and determining whether the carrier in the uplink carrier group and the carrier in the downlink carrier group are available, based on the scheduling of the base station eNB The carrier in the uplink carrier group or the carrier in the downlink carrier group occupies a time slot and an occupied duration, and preempts the carrier in the downlink carrier group or preempts the carrier in the uplink carrier group; or

Configuring a downlink occupied time slot or a subframe to determine the total duration of the occupation, the uplink carrier group, and the downlink carrier group respectively occupied by the uplink carrier group and the downlink carrier group. The duration, and the uplink and downlink switching time points; or, one or more of the following parameters are pre-configured: a fixed total occupied duration, a fixed uplink and downlink time configuration ratio, and a time point of uplink and downlink switching; or

When the carrier in the uplink carrier group and the downlink carrier group is pre-configured to be simultaneously available to the base station eNB and the terminal, the carrier in the downlink carrier group is preempted; or

When a periodic signal with a higher uplink priority needs to be sent, the carrier in the uplink carrier group is preempted, or the time slot in which the uplink periodic signal is located is preferentially allocated as the uplink carrier group and the downlink carrier group. The uplink time slot of the unlicensed carrier; when the periodic signal with a higher downlink priority needs to be transmitted, the carrier in the downlink carrier group is preempted, or the time slot in which the downlink periodic signal is located is preferentially allocated as the The downlink time slot of the unlicensed carrier in the downlink carrier group is described.
The base station for preempting an unlicensed carrier according to claim 14, wherein the configuration module is further configured to:

Configuring a time slot for each unlicensed carrier in the preset unlicensed carrier includes an uplink time slot, a downlink time slot, and/or an uplink and downlink time slot; wherein, the unlicensed carrier in the uplink time slot is used for preemption of the uplink carrier; Time slot non-authorization The carrier is used for preemption of the downlink carrier; the unlicensed carrier in the uplink and downlink time slot is used for preemption of the uplink and/or downlink carrier.
The base station for preempting an unlicensed carrier according to claim 20, wherein the preemption module is further configured to:

Performing an idle channel evaluation on the unlicensed carrier in the uplink time slot, and using the carrier that is lower than the preset channel estimation threshold or the channel idle state in the unlicensed carrier in the uplink time slot as the uplink carrier, and preempting the uplink carrier;

The idle channel is evaluated for the unlicensed carrier in the downlink time slot, and the carrier that is lower than the preset channel estimation threshold or the channel idle state in the unlicensed carrier in the downlink time slot is used as the downlink carrier, and the downlink carrier is preempted.
The base station for preempting an unlicensed carrier according to claim 20 or 21, wherein the configuration module is further configured to:

The uplink time slot of each unlicensed carrier is divided into an uplink short time slot and an uplink long time slot, wherein the duration of the uplink short time slot is smaller than the uplink long time slot, and the unlicensed carrier in the uplink short time slot is used for transmitting the uplink control. Information; an unlicensed carrier in an uplink long time slot is used to transmit uplink user data;

The downlink time slot of each unlicensed carrier is divided into a downlink short time slot and a downlink long time slot, wherein the duration of the downlink short time slot is smaller than the downlink long time slot, and the unlicensed carrier of the downlink short time slot is used for transmitting the downlink control Information; the unlicensed carrier in the downlink long time slot is used to transmit downlink user data.
The base station for preempting an unlicensed carrier according to claim 22, wherein the preemption module is further configured to:

When the uplink user data needs to be transmitted, the idle channel is evaluated on the unlicensed carrier in the uplink long time slot, and the unlicensed carrier in the uplink long time slot is lower than the preset channel estimation threshold or the channel idle state. As an uplink carrier, preempting the uplink carrier;

When the downlink user data needs to be transmitted, the idle channel is evaluated for the unlicensed carrier that is in the downlink long time slot, and the unlicensed carrier that is in the downlink long time slot is lower than the preset channel estimation threshold or the channel idle state. As a downlink carrier, the downlink carrier is preempted.
The base station for preempting an unlicensed carrier according to claim 22, wherein the preemption module is further configured to:

When the uplink control information needs to be transmitted, the unlicensed carrier that is in the uplink short time slot is used as the uplink carrier, and the uplink carrier is preempted;

When the downlink control information needs to be transmitted, the unlicensed carrier that is in the downlink short time slot is used as the downlink carrier, and the downlink carrier is preempted.
A base station for preempting an unlicensed carrier according to claim 22, wherein

And transmitting, when the uplink short time slot overlaps with the uplink long time slot, transmitting an uplink long time slot signal; transmitting the uplink short time slot signal, or interrupting the uplink short time slot signal transmission;

Transmitting a downlink long slot signal when the downlink short slot overlaps with the downlink long slot; transmitting the downlink Short-slot signal, or interrupting the downlink short-slot signal transmission.
A system for preempting an unlicensed carrier, where the system for preempting an unlicensed carrier includes: a base station and a user equipment, where

The base station configures an uplink occupied attribute and a downlink occupied attribute of the preset unlicensed carrier, and sends the configured uplink unoccupied attribute and the downlink occupied attribute of the preset unlicensed carrier to the user equipment;

Receiving, by the user equipment, an uplink occupied attribute and a downlink occupied attribute of the preset unlicensed carrier configured by the base station;

The base station and/or the user equipment perform preemption of the uplink carrier and the downlink carrier on the preset unlicensed carrier based on the configured uplink occupied attribute and the downlink occupied attribute.
The system for preempting an unlicensed carrier according to claim 26, wherein the user equipment is further configured to:

Uplink data is transmitted to the base station based on the preempted uplink carrier.
The system for preempting an unlicensed carrier according to claim 26, wherein the base station is further configured to:

The downlink data is transmitted to the user equipment based on the preempted downlink carrier.