WO2017000411A1 - Collision avoidance method and apparatus for use in unlicensed frequency band - Google Patents

Abstract

Disclosed in the embodiments of the present invention is a collision avoidance method for use in an unlicensed frequency band channel, comprising: setting up collision avoidance parameter values of a load-based listen before talk LBT mechanism of different data types; in the unlicensed frequency band, on the basis of the current data type, using the collision avoidance parameters to implement collision resolution; sending the collision avoidance parameters to a UE, such that the UE uses said collision avoidance parameters to implement collision resolution in the unlicensed frequency band on the basis of the current data type. The technical solution of the embodiments of the present invention enables unlicensed frequency band LTE devices to use different collision avoidance parameters to implement collision avoidance and collision resolution on the basis of transmitted data types, ensuring that high priority traffic of the LTE device is preferentially serviced, effectively supporting transmission of different data types in an unlicensed frequency band.

Description

Collision avoiding method and device for unlicensed frequency band Technical field

The present invention relates to the field of communications technologies, and in particular, to a collision avoidance method and apparatus for an unlicensed band channel.

Background technique

With the rapid increase of mobile communication traffic, the licensed frequency band in the 3GPP network is increasingly unable to meet the increasing traffic volume. In order to further improve the frequency resources on the limited frequency resources, the 3GPP organization turns to the access of the unlicensed band. Technical research, the introduction of LTE Assisted Access (LAA) technology, in order to assist the use of unlicensed frequency bands by means of Long Term Evolution (LTE) access technology on licensed bands.

The WiFi technology on the unlicensed frequency band eliminates interference between different WiFi devices through Carrier Sense Multiple Access/Collision Detection (CSMA/CA). Before transmitting data, the WiFi device performs the first. Withdrawal, the user can start sending signaling or data when the backoff time ends. In order to let the LTE device and the WiFi device compete for resources in an unlicensed frequency band, 3GPP introduces a Listen Before Talk (LBT) mechanism in the LAA for the LTE device to monitor and detect the idle channel on the unlicensed band. . The LBT mechanism monitors and detects the channel of the unlicensed band during the Clear Channel Assessment (CAA) time. When detecting that the unlicensed band is idle, it starts to occupy the unlicensed band for data transmission.

In the LTE system, the priority of the base station and the terminal transmission control signaling is always higher than the priority of the transmission service data, and the system sets different quality of service (QoS) for different types of service bearers of the terminal, so Provide service services with different priority levels. High-priority service is always serviced first to ensure the service quality of high-priority services. However, in the current LAA technology, there is no effective mechanism for distinguishing services between different data types.

How to effectively support different types of data transmission in LAA technology is an urgent problem to be solved.

Summary of the invention

The embodiment of the invention discloses a collision avoidance method for an unlicensed band channel, which is used for collision avoidance and conflict resolution of an LTE device in an unlicensed band. The LTE device in the unlicensed frequency band can use different conflict avoidance parameters to perform conflict avoidance and conflict resolution according to the type of data to be sent, so that the data type with higher priority is more likely to compete for non-authorization. The channel ensures that the high priority service in the LTE device is preferentially served, and effectively supports different types of data transmission in the unlicensed band.

A first aspect of the embodiments of the present invention provides a collision avoidance method for an unlicensed band channel, including:

Setting a collision avoidance parameter value of the load-based LBT mechanism of the different data types; the conflict avoidance parameter value includes a contention window CW initial value, a CW maximum value, a CW increase amplitude value, a delay time Defer Period, and an initial idle channel. Detecting a CCA time and an extended CCA time; the different data types, including reference signals, control signaling, and service data, where the service data includes service data of different quality of service QoS requirements;

In the unlicensed frequency band, the conflict avoidance parameter is used to perform conflict resolution according to a current data type;

Sending the conflict avoidance parameter to the user equipment UE, so that the UE uses the conflict avoidance parameter to perform conflict resolution according to the current data type in the unlicensed frequency band.

In combination with the first aspect, in a first possible implementation manner,

The setting the conflict avoidance parameter of the different data types includes: setting the conflict avoidance parameter value when the reference signal is sent is less than or equal to the conflict avoidance parameter value when sending the control signaling; setting the sending control signaling The conflict avoidance parameter value is less than or equal to the conflict avoidance parameter value when the service data is sent;

The collision avoidance parameter value when the service transmission data with higher delay requirement in the QoS requirement is set is smaller.

In combination with the first aspect, in a second possible implementation, the The conflict avoidance parameter is used for conflict resolution according to the type of data sent, including:

Selecting the conflict avoidance parameter of the current data type to start conflict resolution;

When the conflict resolution is performed, when it is detected that the channel is not idle, a backoff value N is randomly selected from 1 to CW to start the backoff;

Detecting whether the channel is idle in each extended CCA time, and if the channel is detected to be idle, decrementing the N by one;

Dee Period is started if it is detected that the channel is not idle, wherein the Defer Period includes M extended CCA times, and M is greater than or equal to 0; after the Defer Period ends, each extended CCA time is continuously detected, and if the channel is detected If it is idle, the N is decremented by 1;

When the N is reduced to 0, data transmission on the unlicensed band begins.

In conjunction with the second possible implementation of the first aspect, in a third possible implementation, after the Defer Period ends, before the continuing to detect the extended CCA time, the method further includes:

If the channel remains idle during the Defer Period, keep the N unchanged, or reduce the N to max[0, (N-M)];

If the channel does not remain idle during the Defer Period, keep the N unchanged and restart the Defer Period.

With the second possible implementation of the first aspect, in a fourth possible implementation, the using the conflict avoidance parameter to perform conflict resolution according to a current data type in the unlicensed frequency band, further includes:

After transmitting data on the unlicensed frequency band, if a channel conflict is detected, the data is immediately stopped;

The current CW value is updated according to the CW increase amplitude value, and a backoff number N is randomly selected between 1 and the updated CW value to start the backoff.

With the fourth possible implementation of the first aspect, in a fifth possible implementation, if the channel conflict is detected, the data is immediately stopped, including:

When the hybrid automatic repeat request of the UE is not received, the number of HARQ response ACKs exceeds a specified threshold, and When the channel occupation time reaches the specified time threshold, the data transmission is stopped immediately.

With the first aspect or the first possible implementation, in the sixth possible implementation, the sending the conflict avoidance parameter to the user equipment UE includes:

Transmitting the conflict avoidance parameter of different data types to the UE by using a radio resource control RRC message; or

The conflict avoidance parameter of the current data is sent to the UE by using an RRC message.

With reference to the sixth possible implementation of the first aspect, in a seventh possible implementation, after the RRC message is used to send the conflict avoidance parameter of different data types to the UE, the method further include:

The downlink control information DCI through the physical downlink control channel PDCCH or the enhanced physical downlink control channel EPDCCH indicates that the UE performs collision resolution using the collision avoidance parameter of the current data type.

With reference to the first aspect, in an eighth possible implementation manner, the conflict avoidance parameter value of the load-based LBT mechanism that sets different data types includes:

Setting the maximum channel occupation time of different data types increases as the CW of sending different data types increases;

When the maximum channel occupation time exceeds the designated channel occupation time with the increase of the CW, the maximum channel occupation time is set as the designated channel occupation time.

A second aspect of the embodiments of the present invention provides a method for conflict avoidance in an unlicensed frequency band, which is used in a terminal device, and includes:

Receiving a collision avoidance parameter value of the load-based LBT mechanism sent by the base station;

In the unlicensed frequency band, the conflict avoidance parameter is used to perform conflict resolution according to a current data type;

The conflict avoidance parameter value includes a CW initial value, a CW maximum value, a CW increase amplitude value, a Defer Period, an initial CCA time, and an extended CCA time; the different data types include reference signals, control signaling, and service data, The service data includes service data of different quality of service QoS requirements.

With reference to the second aspect, in a first possible implementation manner, the value of the collision avoidance parameter of the load-based LBT mechanism sent by the receiving base station includes:

Receiving, by using an RRC message, the conflict avoidance parameter of different data types sent by the base station; or

The conflict avoidance parameter of the current data type sent by the base station is received by the RRC message.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner, after the conflict avoidance parameter of different data types sent by the base station by using the RRC message, after the using the receiving Before the conflict avoidance parameter is resolved by conflict, the method further includes:

Receiving a DCI of a PDCCH or an EPDCCH sent by the base station, where the DCI is used to indicate that the conflict avoidance parameter of the current data type is used for conflict resolution.

With reference to the second aspect, in a third possible implementation, the using the conflict avoidance parameter to perform conflict resolution according to a current data type includes:

Selecting the conflict avoidance parameter using the current data type;

When the conflict resolution is performed, when it is detected that the channel is not idle, a backoff value N is randomly selected from 1 to CW to start the backoff;

Detecting whether the channel is idle in each extended CCA time, and if the channel is detected to be idle, decrementing the N by one;

Dee Period is started if it is detected that the channel is not idle, wherein the Defer Period includes M extended CCA times, and M is greater than or equal to 0; after the Defer Period ends, each extended CCA time is continuously detected, and if the channel is detected If it is idle, the N is decremented by 1;

When the N is reduced to 0, data transmission on the unlicensed band begins.

With reference to the third possible implementation manner of the second aspect, in a fourth possible implementation, after the ending of the Defer Period, before the continuing to detect the extended CCA time, the method further includes:

If the channel remains idle during the Defer Period, keep the N unchanged, or reduce the N to max[0, (N-M)];

If the channel does not remain idle during the Defer Period, keep the N unchanged and restart the Defer Period.

With the fourth possible implementation of the second aspect, in a fifth possible implementation, the using the conflict avoidance parameter to perform conflict resolution according to a current data type, further includes:

After transmitting data on the unlicensed frequency band, if a channel conflict is detected, the data is immediately stopped;

The current CW value is updated according to the CW increase amplitude value, and a backoff number N is randomly selected between 1 and the updated CW value to start the backoff.

A third aspect of the embodiments of the present invention provides a base station device, including:

a processing unit, configured to set a collision avoidance parameter value of a load-based LBT mechanism of different data types; the conflict avoidance parameter value includes a CW initial value, a CW maximum value, a CW increase amplitude value, a Defer Period, an initial CCA time, and an extended CCA Time; the different data types, including reference signals, control signaling, and service data, where the service data includes service data of different quality of service QoS requirements;

The processing unit is further configured to: use the conflict avoidance parameter to perform conflict resolution according to a current data type in the unlicensed frequency band;

And a sending unit, configured to send the conflict avoidance parameter to the UE, so that the UE uses the conflict avoidance parameter to perform conflict resolution according to the sent data type in the unlicensed frequency band.

With reference to the third aspect, in a first possible implementation, the processing unit is specifically configured to:

Setting the conflict avoidance parameter value when the reference signal is sent is less than or equal to the conflict avoidance parameter value when the control signaling is sent; setting the conflict avoidance parameter value when sending the control signaling is less than or equal to when the service data is sent The conflict avoidance parameter value;

The collision avoidance parameter value when the service transmission data with higher delay requirement in the QoS requirement is set is smaller.

With reference to the third aspect, in a second possible implementation, the processing unit is specifically configured to:

Selecting the conflict avoidance parameter of the current data type to start conflict resolution;

When the conflict resolution is performed, when it is detected that the channel is not idle, a backoff value N is randomly selected from 1 to CW to start the backoff;

Detecting whether the channel is idle in each extended CCA time, and if the channel is detected to be idle, decrementing the N by one;

Dee Period is started if it is detected that the channel is not idle, wherein the Defer Period includes M extended CCA times, and M is greater than or equal to 0; after the Defer Period ends, each extended CCA time is continuously detected, and if the channel is detected If it is idle, the N is decremented by 1;

When the N is reduced to 0, data transmission on the unlicensed band begins.

In conjunction with the second possible implementation of the third aspect, in a third possible implementation, the processing unit is further configured to:

If the channel remains idle during the Defer Period, keep the N unchanged, or reduce the N to max[0, (N-M)];

If the channel does not remain idle during the Defer Period, keep the N unchanged and restart the Defer Period.

In conjunction with the second possible implementation of the third aspect, in a fourth possible implementation, the processing unit is further configured to:

After transmitting data on the unlicensed frequency band, if a channel conflict is detected, the data is immediately stopped;

The current CW value is updated according to the CW increase amplitude value, and a backoff number N is randomly selected between 1 and the updated CW value to start the backoff.

In conjunction with the fourth possible implementation of the third aspect, in a fifth possible implementation, the processing unit is specifically configured to:

When the number of HARQ ACKs that have not received the UE exceeds a specified threshold, and the channel occupation time reaches the specified time threshold, the data transmission is stopped immediately.

With reference to the third aspect and the first possible implementation manner, in a sixth possible implementation manner, the sending unit is specifically configured to:

Sending the conflict avoidance parameter of different data types to the UE by using an RRC message; or

The conflict avoidance parameter of the current data type is sent to the UE by using an RRC message.

In conjunction with the sixth possible implementation of the third aspect, in a seventh possible implementation, The sending unit is further configured to:

The DCI through the PDCCH or the EPDCCH indicates that the UE performs collision resolution using the collision avoidance parameter of the current data type.

With reference to the third aspect, in an eighth possible implementation, the processing unit is specifically configured to:

Setting the maximum channel occupation time of different data types increases as the CW of different data types increases;

When the maximum channel occupation time exceeds the designated channel occupation time with the increase of the CW, the maximum channel occupation time is set as the designated channel occupation time.

A fourth aspect of the embodiments of the present invention provides a terminal device, including:

a receiving unit, configured to receive a collision avoidance parameter value of the load-based LBT mechanism sent by the base station;

a processing unit, configured to use the conflict avoidance parameter received by the receiving unit to perform conflict resolution according to a current data type in the unlicensed frequency band;

The conflict avoidance parameter value includes a CW initial value, a CW maximum value, a CW increase amplitude value, a delay time Defer Period, an initial CCA time, and an extended CCA time; the different data types include reference signals, control signaling, and services. Data, the service data including service data of different quality of service QoS requirements.

With reference to the fourth aspect, in a first possible implementation, the receiving unit is specifically configured to:

Receiving, by using an RRC message, the conflict avoidance parameter of different data types sent by the base station; or

The conflict avoidance parameter of the current data type sent by the base station is received by the RRC message.

In conjunction with the first possible implementation of the fourth aspect, in a second possible implementation, the receiving unit is further configured to:

Receiving a DCI of a PDCCH or an EPDCCH sent by the base station, where the DCI is used to indicate that the conflict avoidance parameter of the current data type is used for conflict resolution.

With reference to the fourth aspect, in a third possible implementation, the processing unit is specifically configured to:

The root selects the conflict avoidance parameter using the current data type;

When the conflict resolution is performed, when it is detected that the channel is not idle, one randomly selects one from 1 to CW. With a backoff value of N, start to evacuate;

Detecting whether the channel is idle in each extended CCA time, and if the channel is detected to be idle, decrementing the N by one;

Dee Period is started if it is detected that the channel is not idle, wherein the Defer Period includes M extended CCA times, and M is greater than or equal to 0; after the Defer Period ends, each extended CCA time is continuously detected, and if the channel is detected If it is idle, the N is decremented by 1;

When the N is reduced to 0, data transmission on the unlicensed band begins.

In conjunction with the third possible implementation of the fourth aspect, in a fourth possible implementation, the processing unit is further configured to:

If the channel remains idle during the Defer Period, keep the N unchanged, or reduce the N to max[0, (N-M)];

If the channel does not remain idle during the Defer Period, keep the N unchanged and restart the Defer Period.

In conjunction with the third possible implementation of the fourth aspect, in a fifth possible implementation, the processing unit is further configured to:

After transmitting data on the unlicensed frequency band, if a channel conflict is detected, the data is immediately stopped;

The current CW value is updated according to the CW increase amplitude value, and a backoff number N is randomly selected between 1 and the updated CW value to start the backoff.

It can be seen that, by using the technical solution of the embodiment of the present invention, the base station can set a collision avoidance parameter value of the load-based LBT mechanism after the different data types are sent, in the unlicensed frequency band, according to the sent data. The type uses the conflict avoidance parameter to perform conflict resolution; and sends the conflict avoidance parameter to the user equipment UE, so that the UE uses the conflict avoidance parameter to perform conflict resolution according to the sent data type in the unlicensed frequency band. Through the foregoing method, the UE may receive the conflict avoidance parameter value of different data types sent by the base station, and use the corresponding conflict avoidance parameter to perform conflict resolution according to the sent data type in the unlicensed frequency band. The technical solution provided by the embodiment of the present invention can make the data type with higher priority easier to compete for the unlicensed channel. The high priority service in the LTE device is guaranteed to be preferentially served, and the support for different types of data transmission is effectively implemented in the unlicensed frequency band.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

1 is a schematic diagram of a load-based LBT mechanism according to an embodiment of the present invention;

2 is a schematic flowchart of a collision avoidance method for an unlicensed band channel according to Embodiment 1 of the present invention;

3 is a schematic flowchart of a collision avoidance method for an unlicensed band channel according to Embodiment 2 of the present invention;

4 is a schematic flowchart of another method for avoiding collision of an unlicensed band channel according to Embodiment 3 of the present invention;

FIG. 5 is a schematic diagram of a collision avoidance parameter configuration according to Embodiment 3 of the present invention; FIG.

6 is a schematic diagram of a DCI information bit according to Embodiment 3 of the present invention;

FIG. 7 is a schematic flowchart of another method for avoiding collision of an unlicensed band channel according to Embodiment 4 of the present invention; FIG.

FIG. 8 is a schematic flowchart of another method for avoiding collision of an unlicensed band channel according to Embodiment 5 of the present invention; FIG.

FIG. 9 is a schematic flowchart of another method for avoiding collision of an unlicensed band channel according to Embodiment 6 of the present invention; FIG.

10 is a schematic flowchart of still another method for avoiding collision of an unlicensed band channel according to Embodiment 7 of the present invention;

11 is a schematic diagram of a base station device according to Embodiment 8 of the present invention;

FIG. 12 is a schematic diagram of a terminal device according to Embodiment 9 of the present invention; FIG.

FIG. 13 is a schematic diagram of another base station device according to Embodiment 10 of the present invention; FIG.

FIG. 14 is a schematic diagram of another terminal device according to Embodiment 11 of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Each embodiment will be described below separately.

The terms "first", "second", "third" and "fourth" and the like in the specification and claims of the present invention and the above drawings are used to distinguish different objects, and are not intended to describe a specific order. Furthermore, the terms "comprises" and "comprising" and "comprising" are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or alternatively Other steps or units inherent to these processes, methods, products or equipment.

3GPP introduced a Listen Before Talk (LBT) mechanism in the LAA for LTE devices to monitor and detect idle channels on unlicensed bands. The LBT mechanism is mainly divided into a frame structure based LBT mechanism and a load based LBT mechanism.

Principle of Load-Based LBT Mechanism Referring to FIG. 1, in the load-based LBT mechanism, the idle channel detection of the LTE device has no fixed period, and the idle channel detection is performed when there is data transmission. Before transmitting data, the LTE device immediately monitors whether the channel is idle at the next available initial CCA time. If the channel is idle, it transmits data in the subsequent channel occupation time, otherwise it does not transmit data; if the channel is monitored at the initial CCA time If the data is busy or the data has not been sent during the channel occupation time, the CCA time is expanded. A backoff value N is randomly selected from 1 to q, where q is the contention window CW size of the extended CCA time, and CW is greater than or equal to 4 and less than or equal to 32. Detect whether the channel is idle in each extended CCA time. If the channel is detected to be idle, the value of N is decremented by one. Otherwise, the value of N is kept unchanged. When N is reduced to 0, the data of the unlicensed band is used to transmit data, otherwise it is not sent. Data, The channel occupation time of the unlicensed band is (13/32)*q milliseconds.

The embodiment of the invention discloses a collision avoidance method for an unlicensed band channel. The LTE device in the unlicensed band can use different conflict avoidance parameters to avoid conflicts according to the sent data type. And conflict resolution, making the data types with higher priority more likely to compete to the unlicensed channel, thereby ensuring that the high priority service priority in the LTE device is preferentially served, and effectively supporting different types of data transmission in the unlicensed frequency band.

Embodiment 1 of the present invention provides a collision avoidance method for an unlicensed frequency band channel of a base station. Referring to FIG. 2, FIG. 2 is a schematic flowchart of a method for avoiding conflicts in an unlicensed band channel according to Embodiment 1 of the present invention. As shown in FIG. 2, the method may include the following steps:

S101. A load-based conflict avoidance parameter value of the LBT mechanism after the different data types are set.

The base station can set conflict avoidance parameters used in collision avoidance in the unlicensed frequency band according to different types of transmission data. The collision avoidance parameter values include a CW initial value, a CW maximum value, a CW increase amplitude value, a delay time Defer Period, an initial idle channel detection CCA time, and an extended CCA time. The CW increase amplitude value represents the speed at which the CW increases after the channel conflict occurs, and the updated CW multiplies or adds the current CW to the CW increase amplitude value. The smaller the CW initial value, the CW maximum value, the CW increase range, the Defer Period, the initial CCA time, and the extended CCA time, the easier the device occupies the channel of the unlicensed band. For example, the smaller the initial value of the CW and the CW maximum value, the smaller the CW initial value and the CW maximum value are. The conflict of the device avoids the backoff value. The smaller the value, the easier it is to occupy the channel. For example, the smaller the Defer Period time is, the shorter the waiting time after detecting the channel is not idle. For example, the smaller the initial CCA time and the extended CCA time, the idle channel. The smaller the detection time, the easier it is to occupy the channel. For another example, the smaller the CW increase amplitude value, the slower the CW increases when a channel collision occurs, and the easier it is to occupy the channel.

The type of transmission data can be divided into reference signals, control signaling, and service data. The uplink reference signal in the LTE system includes a sounding reference signal (SRS), and the downlink reference signal includes a cell reference signal (CRS, Cell Reference Signal), a discovery reference signal (DRS, Discovery Reference Signal), and the like, and uplink control signaling. Channel Quality Indication (CQI) in a physical uplink control channel (PUCCH) and a Physical Uplink Shared Channel (PUSCH), The HARQ ACK/NACK feedback, the scheduling request (SR, the scheduling request), the uplink RRC message, and the like, and the downlink control signaling includes a Physical Downlink Control Channel (PDCCH) and an Enhanced Physical Downlink Control Channel (EPDCCH, Enhanced Physical Downlink). Control Channel), Physical Hybrid ARQ Indicator Channel (PHICH), and downlink RRC message. Since the transmission delay requirements of the reference signal, the control signaling, and the service data are gradually reduced, and the delay requirement of the occupied channel is gradually reduced, the base station can set the collision avoidance parameter when transmitting the reference signal, the control signaling, and the service data, and then sequentially reduce The conflict avoidance parameter value when the reference signal is sent is less than or equal to the conflict avoidance parameter value when the control signaling is sent; and the conflict avoidance parameter value when the control signaling is sent is less than or equal to the transmit service data. The conflict avoidance parameter value at the time; in addition, since the uplink data is transmitted according to the scheduling of the base station, that is, only the scheduled UE participates in the uplink LBT channel detection to contend for the channel, the conflict of sending the uplink data is set. The value of the conflict avoidance parameter when the parameter value is less than or equal to the downlink service data is avoided.

For service data with different QoS requirements, the base station can also set different collision avoidance parameters. Specifically, because the CW initial value, the CW maximum value, the CW increase range, the Defer Period, the initial CCA time, and the extended CCA time are smaller in the collision avoidance parameter, the device is more likely to occupy the channel of the unlicensed band, and the base station can set In the QoS requirement, the higher the delay requirement is, the smaller the value of the collision avoidance parameter is, that is, the easier it is to occupy the channel.

In some feasible implementation manners, the base station may also set different maximum channel occupation time for different transmission data types, that is, when transmitting reference signals, control signaling, and service data, where different QoS services are sent. Different data channel occupation time can also be set. In the prior art, the maximum channel occupation time is (13/32)*q milliseconds, where q is a CW size, and its value is greater than or equal to 4 and less than or equal to 32. In collision avoidance, the CW size may exceed 32 due to the occurrence of channel conflict, and the manner of increasing the CW value may be a superimposed or multiple increase manner. For example, if the CW value is a multiple, and the CW update amplitude value is 2, the base station increases the initial CW value 4 to 8 after detecting the channel collision, and increases the CW value from 8 to 16 after detecting the channel conflict next time. After the channel collision is detected again, the CW value is increased from 16 to 32, and so on. For example, if the CW value increase mode is a superimposition mode and the CW update amplitude value is 2, the base station detects the channel conflict and then initializes the CW. The value 4 is increased to 6, The CW value is increased from 6 to 8 the next time a channel collision is detected, and so on. If the maximum channel occupancy time increases with the CW, the device will be less likely to occupy the channel in the event of a collision, which will reduce the device data transmission performance. For the above reasons, the base station can set a designated channel occupation time as the maximum channel occupation time. The maximum value, for example, is that the specified channel occupancy time is 13 milliseconds, and the maximum channel occupancy time does not exceed 13 milliseconds as the CW increases.

In some feasible implementation manners, the base station may set a collision avoidance parameter value of the unlicensed frequency band by the number of devices competing for the channel in the unlicensed frequency band, and set the conflict avoidance parameter value when the number of devices competing for the channel is increased in the unlicensed frequency band. The larger, making the device less likely to compete for the channel, the collision avoidance parameter values including CW initial value, CW maximum value, CW increase amplitude, Defer Period, initial idle channel detection CCA time or extended CCA time. For example, the greater the number of devices competing for channels in the unlicensed band, the larger the CW increase amplitude value is, so that the probability of collision when transmitting data between devices can be reduced.

In other feasible implementation manners, the conflict avoidance parameter value is determined by negotiating with a device that contends for an unlicensed band channel, where the negotiated conflict avoidance parameter value includes a CW initial value, a CW maximum value, a CW increase range, and a Defer Period. Initial CCA time and extended CCA time. For example, the base station negotiates with other surrounding base stations that compete for unlicensed frequency bands, or between the base station and the WiFi access point (AP, Access Point) device, if the base station 1 occupies a channel time within a specified time compared to the base station. 2 If the channel time occupied by the base station is large, the collision avoidance parameter of the base station 2 is negotiated to be reduced, or the collision avoidance parameter of the base station 1 is negotiated to be increased, so that the base station 2 is more likely to occupy the channel of the unlicensed band, such as the base station. 2 The initial CCA may be reduced, or the value of the extended CCA may be decreased, or the CW increase amplitude value may be decreased, or the Defer Period may be decreased.

S102. In the unlicensed frequency band, use the conflict avoidance parameter to perform conflict resolution according to a current data type.

After the base station sets the conflict avoidance parameter value of the load-based LBT mechanism when sending different data types, the base station may start to use the conflict avoidance parameter to perform conflict resolution according to the currently sent data type, that is, according to the reference signal to be sent, the control signaling, or For the current QoS service data, select the corresponding conflict avoidance parameter to perform backoff.

Under the load-based LBT mechanism, the LTE device is immediately available in the next available before sending data. Whether the listening channel is idle at the initial CCA time, if the channel is idle, the data is transmitted in the subsequent channel occupation time, otherwise the data is not transmitted; if the listening channel is busy during the initial CCA time or the data is not transmitted within the channel occupation time, Then start to expand the CCA time. A backoff value N is randomly selected from 1 to q, where q is the contention window CW size of the extended CCA time, and CW is greater than or equal to 4 and less than or equal to 32. It is detected whether the channel is idle during each extended CCA time. If the channel is detected to be idle, the value of N is decremented by 1, otherwise the value of N is kept unchanged. In order to share the unlicensed band channel more equitably with the WiFi device, the base station may start the Defer Period when it detects that the channel is not idle, and continue to evacuate when the Defer Period ends. When N is reduced to 0, the unlicensed band channel is used to transmit data. Otherwise, no data is transmitted. The channel occupation time of the unlicensed band is (13/32)*q milliseconds. After the data is transmitted, when the channel conflict is detected, the data transmission is stopped immediately, the base station updates the current CW value according to the CW increase range, and randomly selects a backoff number N between 1 and the updated CW value to start the backoff.

S103. Send the conflict avoidance parameter to the UE, so that the UE uses the conflict avoidance parameter to perform conflict resolution according to the current data type in the unlicensed frequency band.

The base station sets the conflict avoidance parameter used in the collision avoidance in the unlicensed frequency band according to different data types in step S101. The conflict avoidance parameter is divided into an uplink conflict avoidance parameter and a downlink collision avoidance parameter, including a CW initial value, a CW maximum value, a CW increase amplitude value, a delay time Defer Period, an initial idle channel detection CCA time, and an extended CCA time. The downlink conflict avoidance parameter is used for the base station to perform collision resolution in the unlicensed frequency band, and the uplink conflict avoidance parameter is used for the UE to perform conflict resolution in the unlicensed frequency band. After the base station determines the uplink collision avoidance parameter according to different types of the transmission data, the collision avoidance parameter may be sent to the UE, so that the UE uses the conflict avoidance parameter to perform conflict resolution according to the currently sent data type in the unlicensed frequency band. .

In some feasible implementation manners, the base station sends a conflict avoidance parameter of sending different data types to the UE by using an RRC message. The UE may select a suitable collision avoidance parameter to perform conflict resolution according to the data type that needs to be sent. The base station may send a dedicated control information (DCI, Dedicated Control Information) of the PDCCH or the EPDCCH to the UE according to the data type to be sent by the current UE. The DCI is used to indicate that the UE uses the collision avoidance parameter of the current transmit data type, that is, the conflict avoidance parameter when the UE is used to send the reference signal or the control signaling or the current QoS service data. Conflict resolution.

In other possible implementation manners, the base station sends, by using an RRC message, a conflict avoidance parameter corresponding to the data type to be sent by the UE to the UE according to the data type to be sent by the current UE. For example, if the current UE is to send a PUCCH, the base station sends a collision avoidance parameter corresponding to the sending control signaling to the UE by using an RRC message.

It can be seen that, by using the technical solution of the embodiment of the present invention, the base station can set a collision avoidance parameter value of the load-based LBT mechanism after the different data types are sent, in the unlicensed frequency band, according to the sent data. The type uses the conflict avoidance parameter to perform conflict resolution; and sends the conflict avoidance parameter to the user equipment UE, so that the UE uses the conflict avoidance parameter to perform conflict resolution according to the sent data type in the unlicensed frequency band. Through the foregoing method, the UE may receive the conflict avoidance parameter value of different data types sent by the base station, and use the corresponding conflict avoidance parameter to perform conflict resolution according to the sent data type in the unlicensed frequency band. The LTE device in the unlicensed frequency band can use different conflict avoidance parameters to perform conflict avoidance and conflict resolution according to the type of data to be sent, so that the data type with higher priority is more likely to compete for non-authorization. The channel ensures that the high priority service in the LTE device is preferentially served, and effectively supports different types of data transmission in the unlicensed band. In addition, the Defer Period is started when the LTE device detects that the channel is not idle, and the backoff is continued after the Defer Period ends, and the data is immediately stopped when the channel conflict is detected, so that the LTE device and the WiFi device occupy the unlicensed band channel more fairly. .

A second embodiment of the present invention provides a method for conflict avoidance of an unlicensed band channel, which is used by a base station or a UE to perform conflict resolution using a collision avoidance parameter. Referring to FIG. 3, FIG. 3 is a schematic flowchart of Embodiment 2 of the present invention. The method provided in the second embodiment includes the steps of:

S201: When there is data to be transmitted, detecting a channel in an initial CCA time.

When the base station or UE has data transmission, it immediately monitors whether the channel is idle at the next available initial CCA time.

S202. Determine whether the channel is idle during the initial CCA period. If the channel is idle during the initial CCA time, the data is transmitted during the subsequent channel occupation time; if the channel is not idle during the initial CCA time, the CCA time is extended after the subsequent channel occupation time.

According to the existing load-based LBT technology, it is judged whether the channel listening result in the initial CCA time is idle, and if the monitoring result is that the channel is idle, the data is transmitted in the subsequent channel occupation time.

If the monitoring result is that the channel is not idle, according to the existing load-based LBT technology, the CCA time is extended after the channel occupation time after the initial CCA time.

S203. Randomly select a backoff value N from 1 to CW.

After the CCA time is extended, a backoff value N is randomly selected from 1 to the current CW. If no channel conflict is detected, the CW is the initial CW value. If the channel conflict is detected before, the CW is increased by the CW. Extended CW value.

S204: Detect a channel in each extended CCA time, and determine whether the channel is idle during the extended CCA period.

After the backoff value N is obtained, the backoff is started, or the backoff process is continued after the Defer Period ends, that is, the channel in each extended CCA time is monitored to detect whether it is an idle channel.

S205. If the channel is idle during the extended CCA period, the backoff value N is decremented by 1.

When the channel is idle during the detection of the extended CCA time, the backoff value N is decremented by one.

S206. If the channel is not idle during the extended CCA period, start a Defer Period, where the Defer Period length is M extended CCA times.

When the channel is detected to be non-idle during the extended CCA time, the delay processing is started, and the Defer Period is started. Since the collision detection mechanism of the WiFi device also performs backoff when the channel is idle, and the LBT mechanism of the LTE device detects that the channel is idle, the data can be immediately transmitted. Therefore, the LTE device can easily preempt the channel in the unlicensed frequency band. The Defer Period is introduced when the LTE device performs the conflict resolution. When the LTE device detects that the channel is not idle, the Defer Period is started. When the Defer Period is finished, the LTE device and the WiFi device can occupy the unlicensed band channel more fairly.

S207. Detect a channel in a Defer Period.

S208: When the Defer Period ends, determine whether the channel in the Defer Period is idle. If the channel in the Defer Period is idle, the backoff is continued; if the channel is not idle in the Defer Period, the Defer Period is started again.

After the Defer Period is started, the channel is monitored. When the Defer Period ends, it is judged whether the channel is idle during the Defer Period, and if the channel is idle, the backoff is continued. In the specific implementation, you can Depending on the type of data being sent, different processing may be performed. At the end of the Defer Period time, M may be subtracted from N to make N take the value of max[0, (NM)], or the value of N may be maintained at the end of the Defer Period time. change. For example, for delay-sensitive control signaling, N is subtracted from M at the end of the Defer Period time. For data services with lower latency requirements, the value of N is kept unchanged at the end of the Defer Period time. In other specific implementation manners, the base station may set the Defer Period of some transmission data types to 0, so that when the channel is not idle when the extended CCA time is detected, no delay processing is performed, for example, when the base station can send the reference signal. The Defer Period is set to 0, that is, when the base station or the UE detects that the channel is not idle when the reference signal is transmitted, no delay processing is performed.

If the listening channel is not idle during the Defer Period, the delay processing is continued, and the Defer Period is started again, so that the backoff can be continued only when the channel is idle during the Defer Period, and the channel in the next extended CCA time is monitored, otherwise it continues. Delay processing.

S209. Determine whether the backoff value N is reduced to 0. If it is not reduced to 0, the backoff is continued.

When the value of N is decremented by 1, it is judged whether the value of N is reduced to 0. If it is not reduced to 0, the backoff is continued, and the channel in the next extended CCA time is monitored.

S210. If the backoff value N is reduced to 0, the backoff is ended, and data transmission is started.

When the value of N is reduced to 0, the back-off transmission data can be ended.

S211. After transmitting the data, check whether the channel has a conflict.

After transmitting the data, the base station or the UE may continue to detect whether the channel has a collision. If the channel collision is not detected, the collision avoidance may be ended, or the data may continue to be transmitted during the channel occupation time; if the channel collision is detected, the data may be retracted to continue transmitting data. Because the LTE device in the prior art does not support collision detection, collision detection is introduced and the data is stopped and the backoff is started immediately when the collision is detected, so that the LTE device and the WiFi device can occupy the unlicensed band channel more fairly.

S212. If it is detected that the channel conflicts, immediately stop transmitting data; update the current CW according to the CW increase amplitude value, randomly select a backoff number N between 1 and the updated CW, and start backoff.

If the channel is detected to be in conflict after the data is transmitted, the data transmission is stopped immediately, and the base station or the UE has multiple methods for detecting channel collision.

The embodiment of the present invention provides a collision detection method. In the downlink direction, when a base station does not receive a hybrid automatic repeat request (HARQ, Hybrid Automatic Repeat) of a corresponding UE that transmits downlink data. When the number of acknowledgments (ACK, Acknowledgement) exceeds the specified threshold, and the channel occupation time reaches the specified time threshold, it is determined that the current channel conflicts. The number of ACKs that have not received the UE includes the number of negative acknowledgements (NACKs, Negative Acknowledgements) received by the base station, and the number of times that the ACKs are neither received nor received. For example, when the number of ACKs of the corresponding UE that the base station does not receive the downlink data reaches 50%, and the current channel occupation time reaches 60% of the maximum channel occupation time, it is determined that the current downlink channel conflicts. In the uplink direction, when the number of HARQ ACKs of the corresponding base station that does not receive the uplink data is exceeded by the UE, the current channel conflict is determined. The number of ACKs that have not received the base station includes the number of NACKs received by the UE and the number of times that neither the ACK nor the NACK is received. For example, when the number of ACKs of the corresponding base station that the UE does not receive the uplink data reaches 50%, it is determined that the current uplink channel conflicts.

When the unlicensed band is used only for downlink, the base station transmits data in the nth subframe, and the UE can only feed back in the uplink subframe of n+4. The HARQ feedback will bring a large delay, because the base station detects 4ms before. Whether the channel has a conflict. If the channel is detected to be in conflict early, the data can be stopped early to avoid further collisions. Therefore, the embodiment of the present invention provides that the UE can reduce the delay of the HARQ ACK/NACK feedback, for example, reduce the 4 ms to 1 ms, 2 ms, or 3 ms, that is, reduce the data processing delay of the UE, and if the UE can quickly decode the data, it can be effective. Reduce the HARQ feedback delay. Similarly, when the unlicensed band is used in the TDD system, the feedback delay of the uplink and downlink HARQ ACK/NACK needs to be reduced by reducing the data processing delay. In a specific implementation, in order to further reduce the data processing delay, a small pre-processing packet with the same modulation coding mode as the valid data may be sent in front of the valid data for fast pre-determination whether the valid data can be decoded later. Correctly, if the pre-processing packet is decoded correctly, it can be preliminarily judged that the valid data in the following can be correctly decoded.

After detecting the channel conflict, the base station may update the current CW according to the CW increase amplitude value, randomly select a backoff number N between 1 and the updated CW, and restart the backoff. For example, when a channel collision is detected, if the CW increase amplitude value is increased to 2 times the original CW value, the current CW value is expanded to 2 times as the backoff CW value. The method of restarting the backoff is the same as the method of the above-mentioned base station detecting that the channel is not idle.

S213. If the channel has no conflict, determine whether the data is sent.

When the detection result is that there is no conflict on the channel, it is judged whether all the data has been sent, if it has been sent The conflict avoidance process ends when all data is sent, otherwise the data continues to be sent.

S214. If the data is not sent, continue to send data, otherwise the conflict avoidance is ended.

It can be seen that, by using the proposed unlicensed band conflict resolution method in the second embodiment of the present invention, the base station or the UE can detect that the channel is not idle, start the Defer Period, perform delay processing, and if the Defer Period ends, if it is within the Defer Period. If the channel is idle, the value of N can be kept constant or the value of N can be decremented. If the channel is not idle during the Defer Period, the base station or the UE restarts the Defer Period to continue the delay processing. In the technical solution, after the data is sent. The base station or the UE determines whether to send a channel collision through the received feedback of the HARQ, and stops the data transmission immediately if the channel conflict is detected, thereby avoiding further channel conflicts. Compared with the prior art, the conflict solution proposed by the second embodiment of the present invention is compared. The LTE device and the WiFi device can be used to more equally occupy the unlicensed band channel, preventing the channel usage of the WiFi device from being reduced.

Embodiment 3 of the present invention provides another collision avoidance method for an unlicensed frequency band. Referring to FIG. 4, FIG. 4 is a schematic flowchart of a method for avoiding collision of an unlicensed band channel according to Embodiment 3 of the present invention. As shown in FIG. 4, the method may include the following steps:

S301. A load-based conflict avoidance parameter value of the LBT mechanism after the different data types are set.

The base station can set conflict avoidance parameters used in collision avoidance in the unlicensed frequency band according to different types of transmission data. The collision avoidance parameter values include a CW initial value, a CW maximum value, a CW increase amplitude value, a delay time Defer Period, an initial idle channel detection CCA time, and an extended CCA time. The CW increase amplitude value represents the speed at which the CW increases after the channel conflict occurs, and the updated CW multiplies or adds the current CW to the CW increase amplitude value.

Different data types can be divided into reference signals, control signaling, and service data. Since the transmission delay requirements of the reference signal, the control signaling, and the service data are gradually reduced, and the delay requirement of the occupied channel is gradually reduced, the base station can set the collision avoidance parameter when transmitting the reference signal, the control signaling, and the service data, and then sequentially reduce The conflict avoidance parameter value when the reference signal is sent is less than or equal to the conflict avoidance parameter value when the control signaling is sent; and the conflict avoidance parameter value when the control signaling is sent is less than or equal to the transmit service data. The conflict avoidance parameter value at the time. In addition, due to uplink data The transmission is performed according to the scheduling of the base station, that is, only the scheduled UE participates in the uplink LBT channel detection to contend for the channel, so the value of the collision avoidance parameter for setting the uplink data is less than or equal to the collision when the downlink service data is sent. Avoid parameter values.

For service data with different QoS requirements, the base station can also set different collision avoidance parameters. Specifically, the smaller the collision avoidance parameter value is, the easier the device is to occupy the channel of the unlicensed frequency band, and the base station can set the traffic avoidance parameter with the higher delay requirement in the QoS requirement, and the smaller the conflict avoidance parameter value is, The easier it is to occupy the channel.

For example, the base station sets different conflict avoidance parameters for the reference signal, the control signaling, and the service data. As shown in FIG. 5, FIG. 5 is a schematic diagram of conflict avoidance parameter configuration, and the base station performs different QoS services according to the requirement of delay. It is divided into delay-sensitive, delay-moderate, and low-latency sensitive services, and sets three conflict avoidance parameters for service data.

S302. In the unlicensed frequency band, use the conflict avoidance parameter to perform conflict resolution according to a current data type.

The base station selects the conflict avoidance parameter according to the type of the sent data and performs the conflict resolution. For details, refer to the first embodiment or the second embodiment of the present invention, and details are not described herein again.

S303. Send conflict avoidance parameters of different data types to the UE by using an RRC message.

In step S301, the base station sets a collision avoidance parameter used when the collision avoidance is performed in the unlicensed frequency band according to different transmission data types. The set conflict avoidance parameters are divided into an uplink conflict avoidance parameter and a downlink conflict avoidance parameter. The downlink conflict avoidance parameter is used for the base station to perform collision resolution in the unlicensed frequency band, and the uplink conflict avoidance parameter is used for the UE to perform conflict resolution in the unlicensed frequency band. After determining, by the base station, the uplink collision avoidance parameter according to different types of transmission data, the uplink conflict avoidance parameter may be sent to the UE, so that the UE uses the conflict avoidance parameter to perform conflict resolution according to the current data type in the unlicensed frequency band. .

The base station may send all the conflict avoidance parameters when transmitting the reference signal, the control signaling, and the service data to the UE, where the conflict avoidance parameter when transmitting the service data includes different conflict avoidance parameters for sending different QoS requirements. For example, the base station sends all five different collision avoidance parameters shown in Figure 5. Send it to the UE.

S304. Acquire a current sending data type of the UE.

After the conflict avoidance parameter of the different data types is sent to the UE by using the RRC message, the UE may select an appropriate conflict avoidance parameter to perform conflict resolution according to the current data type to be sent; or the base station may use the data to be sent by the current UE. A type, sending a DCI of a PDCCH or an EPDCCH to the UE, the DCI being used to indicate that the UE uses a collision avoidance parameter of a current data type. When the base station is required to indicate to the UE that the collision avoidance parameter of the current data type is used by the DCI, the base station first acquires the current transmission data type of the UE, and the UE may indicate the current data type to be sent to the base station by using uplink signaling.

S305. The DCI of the PDCCH or the EPDCCH is used to indicate that the UE uses the conflict avoidance parameter of the currently sent data type to perform conflict resolution according to the data type to be sent by the current UE.

After the base station determines the current transmission data type of the UE, the DCI of the PDCCH or the EPDCCH indicates that the UE uses the collision avoidance parameter of the current data type to be used for collision resolution. For example, if the base station sets five different collision avoidance parameters as shown in FIG. 5 according to different data types, the 3-bit information may be used in the DCI information to indicate the current transmit data type of the UE, as shown in FIG. If the base station learns that the data type currently to be transmitted by the UE is a reference signal, the 3-bit information in the DCI information is set to "001".

It can be seen that, by using the technical solution of the third embodiment of the present invention, the base station can set the collision avoidance parameter value of the load-based LBT mechanism when the base station sets different data types, and the base station uses the conflict avoidance parameter according to the current data type. Performing conflict resolution; sending the conflict avoidance parameter to the UE, obtaining the current transmit data type of the UE, and indicating to the UE, by using the DCI, a conflict avoidance parameter corresponding to the data type to be sent, so that the UE is based on the unlicensed frequency band. The current data type uses the conflict avoidance parameter for conflict resolution. The LTE device in the unlicensed frequency band can use different conflict avoidance parameters to perform conflict avoidance and conflict resolution according to the type of data to be sent, so that the data type with higher priority is more likely to compete for non-authorization. Channels to ensure that high-priority services in LTE devices are preferentially served, effectively implementing the unlicensed band Support for different types of data transfer. .

Embodiment 4 of the present invention provides another collision avoidance method for an unlicensed frequency band. Referring to FIG. 7, FIG. 7 is a schematic flowchart of a method for avoiding conflicts in an unlicensed band channel according to Embodiment 4 of the present invention. As shown in FIG. 7, the method may include the following steps:

S401. A load-based conflict avoidance parameter value of the LBT mechanism after the different data types are set.

The base station can set conflict avoidance parameters used in collision avoidance in the unlicensed frequency band according to different data types. The collision avoidance parameter values include a CW initial value, a CW maximum value, a CW increase amplitude value, a delay time Defer Period, an initial idle channel detection CCA time, and an extended CCA time. The CW increase amplitude value represents the speed at which the CW increases after the channel conflict occurs, and the updated CW multiplies or adds the current CW to the CW increase amplitude value.

Different data types can be divided into reference signals, control signaling, and service data. Since the transmission delay requirements of the reference signal, the control signaling, and the service data are gradually reduced, and the delay requirement of the occupied channel is gradually reduced, the base station can set the collision avoidance parameter when transmitting the reference signal, the control signaling, and the service data, and then sequentially reduce small. In addition, since the uplink data is sent according to the scheduling of the base station, that is, only the scheduled UE participates in the uplink LBT channel detection to contend for the channel, the value of the conflict avoidance parameter for sending the uplink data is less than or equal to the downlink service data. The conflict avoidance parameter value at the time.

For the service data of different QoS requirements, the base station can also set different conflict avoidance parameters, and set the smaller the collision avoidance parameter value when the service transmission data with higher delay requirement in the QoS requirement is set, so that the service with high delay requirement can be It is easier to occupy the channel.

The base station can set the collision avoidance parameter value of the unlicensed frequency band in the number of devices competing for the channel in the unlicensed frequency band. The more the number of devices contending for the channel in the unlicensed frequency band, the larger the value of the conflict avoidance parameter is set, making the device less easy. Competing to the channel, the collision avoidance parameter values include a CW initial value, a CW maximum value, a CW increase amplitude, a Defer Period, an initial idle channel detection CCA time, or an extended CCA time. For example, the greater the number of devices competing for channels in the unlicensed band, the more the CW is increased. The greater the degree, the less the probability of collisions when sending data between devices.

S402. In the unlicensed frequency band, use the conflict avoidance parameter to perform conflict resolution according to a current data type.

The base station selects the conflict avoidance parameter according to the type of the sent data and performs the conflict resolution. For details, refer to the first embodiment or the second embodiment of the present invention, and details are not described herein again.

S403. Acquire a current sending data type of the UE.

In step S401, the base station sets a collision avoidance parameter used when the collision avoidance is performed in the unlicensed frequency band according to different transmission data types. The set conflict avoidance parameters are divided into an uplink conflict avoidance parameter and a downlink conflict avoidance parameter. The downlink conflict avoidance parameter is used for the base station to perform collision resolution in the unlicensed frequency band, and the uplink conflict avoidance parameter is used for the UE to perform conflict resolution in the unlicensed frequency band. After the base station determines the uplink collision avoidance parameter according to different types of the transmission data, the collision avoidance parameter may be sent to the UE, so that the UE uses the conflict avoidance parameter to perform conflict resolution according to the current data type in the unlicensed frequency band.

After setting the uplink collision avoidance parameter, the base station may send the conflict avoidance parameter of the current data type of the UE to the UE by using an RRC message. Therefore, the base station first needs to obtain the current transmission data type of the UE, and the UE can indicate the current data type to be sent to the base station through the uplink signaling.

S404. Send, by using an RRC message, a collision avoidance parameter of a data type currently sent by the UE to the UE.

After the base station determines the current transmission data type of the UE, the UE sends the conflict avoidance parameter of the data type currently sent by the UE to the UE through the RRC message, so that the UE performs conflict resolution. For example, if the base station sets five different collision avoidance parameters as shown in FIG. 5 according to different types of transmission data, when the base station learns that the current data type to be transmitted by the UE is time-delay-sensitive service data, the base station The conflict avoidance parameter corresponding to the time-sensitive service data is sent to the UE by using the RRC message.

It can be seen that, by using the technical solution of the fourth embodiment of the present invention, the base station can set the collision avoidance parameter value of the load-based LBT mechanism when the base station sets different data types, and the base station uses the conflict avoidance parameter to perform conflict according to the current data type. Solving; acquiring the current data type of the UE, and sending the conflict avoidance parameter corresponding to the current data sent by the UE to the UE by using an RRC message, so that the UE is in the The conflict avoidance parameter of the current data type is used in the unlicensed frequency band for conflict resolution. The LTE device in the unlicensed frequency band can use different conflict avoidance parameters to perform conflict avoidance and conflict resolution according to the type of data to be sent, so that the data type with higher priority is more likely to compete for non-authorization. The channel ensures that the high priority service in the LTE device is preferentially served, and effectively supports different types of data transmission in the unlicensed band.

Embodiment 5 of the present invention provides a collision avoidance method for another unlicensed band channel of a UE. Referring to FIG. 8, FIG. 8 is a schematic flowchart of a method for avoiding conflicts in an unlicensed band channel according to Embodiment 1 of the present invention. As shown in FIG. 8, the method may include the following steps:

S501. Receive a collision avoidance parameter value of the load-based LBT mechanism sent by the base station.

The base station sets conflict avoidance parameters used in collision avoidance in the unlicensed frequency band according to different data types. The collision avoidance parameter values include a CW initial value, a CW maximum value, a CW increase amplitude value, a delay time Defer Period, an initial idle channel detection CCA time, and an extended CCA time. The uplink data type of the UE can be divided into reference signals, control signaling, and service data. Since the transmission delay requirements of the reference signal, the control signaling, and the service data are gradually reduced, and the delay requirement of the occupied channel is gradually reduced, the base station can set the collision avoidance parameter when transmitting the reference signal, the control signaling, and the service data, and then sequentially reduce small.

The set conflict avoidance parameters are divided into an uplink conflict avoidance parameter and a downlink conflict avoidance parameter. The downlink conflict avoidance parameter is used for the base station to perform collision resolution in the unlicensed frequency band, and the uplink conflict avoidance parameter is used for the UE to perform conflict resolution in the unlicensed frequency band. The uplink data is sent according to the scheduling of the base station, that is, only the scheduled UE participates in the uplink LBT channel detection to contend for the channel, so the collision avoidance parameter value of the uplink data set by the base station is less than or equal to the downlink service data. Conflict avoidance parameter value. After the base station determines the uplink collision avoidance parameter according to different types of the transmission data, the collision avoidance parameter may be sent to the UE, so that the UE uses the conflict avoidance parameter to perform conflict resolution according to the sent data type in the unlicensed frequency band.

In some feasible implementation manners, the base station may send all the conflict avoidance parameters of different data types to the UE by using an RRC message, that is, the UE may obtain all data type pairs through the RRC message. The conflict avoidance parameter should be selected by the UE; then, the UE can select the corresponding conflict avoidance parameter from all the conflict avoidance parameters according to the type of the data to be sent, or the UE can receive the PDCCH DCI sent by the base station to learn the conflict avoidance parameter of the currently sent data type, thereby Use this conflict to avoid parameters for conflict resolution.

In another possible implementation manner, after the base station learns the data type to be sent by the UE, the UE may send the conflict avoidance parameter corresponding to the current data type of the UE to the UE by using an RRC message, and the UE receives the current data type to be sent through the RRC message. The conflict avoids parameters and thus resolves the conflict.

S502. In the unlicensed frequency band, use the received conflict avoidance parameter to perform conflict resolution according to a current data type.

Under the load-based LBT mechanism, before transmitting data, the UE immediately monitors whether the channel is idle at the next available initial CCA time, and if the channel is idle, transmits data in the subsequent channel occupation time; otherwise, the data is not sent; if at the initial When the listening channel is busy at the CCA time or the data is not transmitted within the channel occupation time, the CCA time is expanded. A backoff value N is randomly selected from 1 to q, where q is the contention window CW size of the extended CCA time, and CW is greater than or equal to 4 and less than or equal to 32. It is detected whether the channel is idle during each extended CCA time. If the channel is detected to be idle, the value of N is decremented by 1, otherwise the value of N is kept unchanged. In order to share the unlicensed band channel more equitably with the WiFi device, the UE may start the Defer Period when it detects that the channel is not idle, and continue to evacuate when the Defer Period ends. When N is reduced to 0, the unlicensed band channel is used to transmit data. Otherwise, no data is transmitted. The channel occupation time of the unlicensed band is (13/32)*q milliseconds. After the data is transmitted, when the channel conflict is detected, the data is immediately stopped, the UE updates the current CW value according to the CW increase range, and randomly selects a backoff number N between 1 and the updated CW value to start the backoff.

It can be seen that, by using the technical solution provided by the fifth embodiment of the present invention, the UE may use the conflict avoidance parameter value sent by the base station, and use the corresponding conflict avoidance parameter to perform conflict resolution according to the current data type in the unlicensed frequency band. The data type with high priority is more likely to compete to the unlicensed channel, thereby ensuring that the high priority service in the UE is preferentially served, effectively implementing different pairs in the unlicensed band. Type of data transfer support.

The specific method for the UE to use the conflict avoidance parameter to perform the conflict resolution is the same as the method for the base station to perform the conflict resolution according to the embodiment of the present invention. When the UE detects that the channel is not idle, the Defer Period is started, and after the Defer Period ends, the backoff is continued, and the detection is continued. The data transmission is stopped immediately when the channel conflicts, so that the LTE UE and the WiFi device occupy the unlicensed band channel more fairly.

Embodiment 6 of the present invention provides a collision avoidance method for another unlicensed band channel of a UE. Referring to FIG. 9, FIG. 9 is a schematic flowchart of a collision avoidance method for an unlicensed band channel according to Embodiment 1 of the present invention. As shown in FIG. 9, the method may include the following steps:

S601. Receive, by using an RRC message, a collision avoidance parameter of different data types sent by the base station.

The conflict avoidance parameters set by the base station are classified into an uplink conflict avoidance parameter and a downlink conflict avoidance parameter. The downlink conflict avoidance parameter is used for the base station to perform collision resolution in the unlicensed frequency band, and the uplink conflict avoidance parameter is used for the UE to perform conflict resolution in the unlicensed frequency band. The uplink data is sent according to the scheduling of the base station, that is, only the scheduled UE participates in the uplink LBT channel detection to contend for the channel, so the collision avoidance parameter value of the uplink data set by the base station is less than or equal to the downlink service data. Conflict avoidance parameter value. After the base station determines the uplink collision avoidance parameter according to different types of the transmission data, the collision avoidance parameter may be sent to the UE, so that the UE uses the conflict avoidance parameter to perform conflict resolution according to the sent data type in the unlicensed frequency band.

The base station may send all the conflict avoidance parameters when the reference signal, the control signaling, and the service data are sent to the UE by using the RRC message, that is, the UE may obtain the conflict avoidance parameter corresponding to all the data types by using the RRC message. The conflict avoidance parameter when the service data is sent includes different conflict avoidance parameters for sending different QoS requirements. For example, the base station transmits all five different collision avoidance parameters shown in FIG. 5 to the UE.

S602. Indicate to the base station the type of data currently to be sent.

After the UE receives the conflict avoidance parameter of the different data types by using the RRC message, the UE may select the appropriate conflict avoidance parameter to perform conflict resolution according to the current data type to be sent; or the UE may obtain the current transmit data by receiving the DCI sent by the base station. Type conflict avoidance parameters. When the UE learns the collision avoidance parameter of the current transmission data type through the DCI, the base station first acquires the current transmission data type of the UE, and the UE may indicate the current data type to be sent to the base station through the uplink signaling.

S603. Receive a DCI sent by the base station, where the DCI is used to indicate that the conflict avoidance parameter when using the sending reference signal, the control signaling, or the current QoS service data is used for conflict resolution.

After the base station determines the current transmission data type of the UE, the DCI of the PDCCH or the EPDCCH indicates that the UE uses the collision avoidance parameter of the current data type to be used for collision resolution. In this way, the UE can learn the conflict avoidance parameter corresponding to the current sending data type by receiving the DCI. For example, if the base station sets five different collision avoidance parameters as shown in FIG. 5 according to different types of transmission data, the 3-bit information may be used in the DCI information to indicate the current transmission data type of the UE, as shown in FIG. 6. If the base station learns that the data type to be sent by the UE is the reference signal, the 3-bit information in the DCI information is set to “001”, and the UE learns to use the conflict avoidance parameter corresponding to the reference signal to perform conflict resolution by receiving the DCI information.

It can be seen that, by using the technical solution of the fifth embodiment of the present invention, the UE can receive the conflict avoidance parameter of different data types sent by the base station by using the RRC message, and after the UE receives the conflict avoidance parameter of different data types by using the RRC message, the UE indicates to the base station. The type of data to be sent currently receives the DCI sent by the base station, and the DCI is used to indicate that the conflict avoidance parameter that sends the current data type is used for conflict resolution. The technical solution proposed by the fifth embodiment of the present invention enables the UE in the unlicensed frequency band to use different collision avoidance parameters to perform collision avoidance and conflict resolution according to the type of the data to be sent, so that the data type with higher priority is more likely to compete for the unlicensed channel. Therefore, the high priority service in the UE is preferentially served, and the support for different types of data transmission is effectively implemented in the unlicensed frequency band.

Embodiment 7 of the present invention provides a collision avoidance method for another unlicensed band channel of a UE. FIG. 10 is a schematic flowchart of a method for avoiding conflicts in an unlicensed band channel according to Embodiment 1 of the present invention. As shown in FIG. 10, the method may include the following steps:

S701. Indicate to the base station the type of data currently to be sent.

The base station sets the collision avoidance when the unlicensed frequency band is used according to different transmission data types. Conflict avoidance parameters. The set conflict avoidance parameters are divided into an uplink conflict avoidance parameter and a downlink conflict avoidance parameter. The downlink conflict avoidance parameter is used for the base station to perform collision resolution in the unlicensed frequency band, and the uplink conflict avoidance parameter is used for the UE to perform conflict resolution in the unlicensed frequency band. The uplink data is sent according to the scheduling of the base station, that is, only the scheduled UE participates in the uplink LBT channel detection to contend for the channel, so the collision avoidance parameter value of the uplink data set by the base station is less than or equal to the downlink service data. Conflict avoidance parameter value. After the base station determines the uplink collision avoidance parameter according to different types of the transmission data, the collision avoidance parameter may be sent to the UE, so that the UE uses the conflict avoidance parameter to perform conflict resolution according to the sent data type in the unlicensed frequency band.

After setting the uplink collision avoidance parameter, the base station may send the conflict avoidance parameter of the current data type of the UE to the UE according to the data type to be sent by the current UE. Therefore, the base station first needs to obtain the current transmission data type of the UE, and the UE can indicate the current data type to be sent to the base station through the uplink signaling.

S702. Receive, by using an RRC message, a collision avoidance parameter corresponding to a current data type sent by the base station.

After the base station determines the current type of the data to be sent by the UE, the UE uses the RRC message to resolve the collision avoidance parameter of the data type to be sent by the UE, that is, the base station sends the collision avoidance parameter of the data type to be sent by the current UE to the UE, so that the base station sends the collision avoidance parameter of the data type to be sent by the current UE to the UE. The UE can obtain the conflict avoidance parameter corresponding to the current data type. For example, if the base station sets five different collision avoidance parameters as shown in FIG. 5 according to different types of transmission data, when the base station learns that the current data type to be transmitted by the UE is time-delay-sensitive service data, the base station The conflict avoidance parameter corresponding to the time-sensitive service data is sent to the UE by using the RRC message, and the UE receives the conflict avoidance parameter corresponding to the current high-sensitivity service sent by the base station by using the RRC message.

It can be seen that, in the technical solution provided by the seventh embodiment of the present invention, after the base station sets the collision avoidance parameter used in the collision avoidance of the unlicensed frequency band according to different data types, the UE indicates to the base station the current data type to be sent, and the base station Obtaining a current data type of the UE, and sending the conflict avoidance parameter corresponding to the current data to the UE by using an RRC message, so that the UE uses the conflict avoidance parameter to perform conflict resolution according to the current data type in the unlicensed frequency band. Using the invention The technical solution provided by the embodiment can enable the UE in the unlicensed band to use different collision avoidance parameters to perform collision avoidance and conflict resolution according to the type of data to be sent, so that the data type with higher priority is more likely to compete to the unlicensed channel, thereby ensuring The high priority service in the UE is preferentially served, effectively supporting different types of data transmission in the unlicensed frequency band.

Embodiment 8 of the present invention provides a base station device, which is used to implement a collision avoidance method for an unlicensed frequency band according to Embodiments 1 to 4 of the present invention. Referring to FIG. 11, the base station device a00 may include a processing unit a10 and a transmitting unit a20.

The processing unit a10 is configured to set a conflict avoidance parameter value of the load-based LBT mechanism when different data types are set; the conflict avoidance parameter value includes a CW initial value, a CW maximum value, a CW increase amplitude value, a maximum channel occupation time, and a Defer Period. And an initial CCA time and an extended CCA time; the processing unit is further configured to: use the conflict avoidance parameter to perform conflict resolution according to the current data type in the unlicensed frequency band;

The sending unit a20 is configured to send the conflict avoidance parameter to the UE, so that the UE uses the conflict avoidance parameter to perform conflict resolution according to the current data type in the unlicensed frequency band.

Specifically, the processing unit a10 can set the conflict avoidance parameter used when the collision avoidance is performed in the unlicensed frequency band according to different data types. The type of transmission data can be divided into reference signals, control signaling, and service data. The smaller the collision avoidance parameter value, the easier it is for the device to occupy the channel of the unlicensed band.

The processing unit a10 may set the collision avoidance parameter value when the reference signal is transmitted to be less than or equal to the conflict avoidance parameter value when the control signaling is sent, because the transmission delay requirement of the reference signal, the control signaling, and the service data is gradually decreased. Setting the conflict avoidance parameter value when sending the control signaling is less than or equal to the conflict avoidance parameter value when the service data is sent; in addition, since the sending of the uplink data is sent after the base station scheduling, that is, only the scheduling is performed. The UE needs to participate in the uplink LBT channel detection to contend for the channel, so the collision avoidance parameter value of the uplink data transmission is less than or equal to the collision avoidance parameter value when the downlink transmission service data is sent.

For service data with different QoS requirements, the processing unit a10 can also set different conflict avoidance parameters. Specifically, because the collision avoidance parameter value is smaller, the device is more likely to occupy the channel of the unlicensed band, and the conflict avoidance parameter when the service transmission data with higher delay requirement in the QoS requirement can be set. The smaller the value, the easier it is to occupy the channel.

In some feasible implementation manners, the processing unit a10 may set a maximum channel occupation time when transmitting the reference signal, the control signaling, and the service data, where different maximum channel occupations may also be set when transmitting data of different QoS services. time. If the maximum channel occupancy time increases with CW, the device will be less likely to occupy the channel in the event of a collision, which will reduce the device data transmission performance, so the processing unit a10 can set the maximum channel occupancy time, when the maximum channel When the occupation time increases with the increase of CW, the maximum channel occupation time does not exceed the maximum value.

In some feasible implementation manners, the processing unit a10 may set a collision avoidance parameter value of the unlicensed frequency band according to the number of devices competing for the channel in the unlicensed frequency band, and the more the number of devices competing for the channel in the unlicensed frequency band, the conflict is set. Avoiding larger parameters makes the device less likely to compete for the channel. For example, the greater the number of devices competing for channels in the unlicensed band, the larger the CW increase amplitude value is, so that the probability of collision of transmitted data between devices can be reduced.

In other feasible implementation manners, the processing unit a10 determines the conflict avoidance parameter value by negotiating with a device that contends for the unlicensed band channel, wherein the negotiated conflict avoidance parameter value includes a CW initial value, a CW maximum value, and a CW increase range. , Defer Period, initial CCA time, and extended CCA time.

After the conflict avoidance parameter is set, the processing unit a10 uses the conflict avoidance parameter to perform conflict resolution according to the current data type. Specifically, the following conflict resolution method is adopted. Under the load-based LBT mechanism, before transmitting data, the processing unit a10 monitors whether the channel is idle at the next available initial CCA time, and if the channel is idle, transmits data in the subsequent channel occupation time; otherwise, no data is transmitted; When the listening channel is busy at the initial CCA time or the data is not transmitted within the channel occupation time, the CCA time is expanded. The processing unit a10 randomly selects a backoff value N from 1 to q, where q is the contention window CW size of the extended CCA time, CW is greater than or equal to 4 and less than or equal to 32. The processing unit a10 detects whether the channel is idle during each extended CCA time, and if the channel is detected to be idle, the value of N is decremented by 1, otherwise the value of N is kept unchanged. In order to share the unlicensed band channel more equitably with the WiFi device, the Defer Period may be started when it is detected that the channel is not idle, and the backoff is continued when the Defer Period ends. When N is reduced to 0, the unlicensed band channel is used to transmit data, otherwise the number is not sent. according to. After the data is transmitted, when the processing unit a10 detects the channel conflict, the data transmission is stopped immediately, the processing unit a10 updates the current CW value according to the CW increase amplitude, randomly selects a backoff number N between 1 and the updated CW value, and starts. Retreat.

After the processing unit a10 determines the uplink collision avoidance parameter according to different data types, the sending unit a20 sends the conflict avoidance parameter to the UE, so that the UE uses the conflict avoidance parameter according to the current data type in the unlicensed frequency band. Conflict resolution.

In some feasible implementation manners, the sending unit a20 sends a conflict avoidance parameter when transmitting the reference signal, the control signaling, and the service data to the UE by using an RRC message, where the conflict avoidance parameter when sending the service data includes sending different QoS. Different said conflict avoidance parameters are required. The UE may select a suitable collision avoidance parameter to perform conflict resolution according to the data type that needs to be sent, or may send a DCI of the PDCCH or the EPDCCH to the UE according to the data type to be sent by the current UE, where the DCI is used to indicate the UE. The conflict avoidance parameter of the current transmit data type is used, that is, the UE is instructed to use the conflict avoidance parameter when transmitting the reference signal or the control signaling or the current QoS service data to perform conflict resolution.

In other possible implementation manners, according to the data type that the current UE is to send, the sending unit a20 sends the conflict avoidance parameter corresponding to the data type that the UE is currently sending by the RRC message to the UE, that is, the reference signal or the control signaling is sent. The collision avoidance parameter of the current QoS service data of the UE is sent to the UE.

It can be seen that the technical solution of the embodiment of the present invention causes the base station to set a collision avoidance parameter value of the LBT mechanism based on the load when the data type is set, and uses the conflict according to the current data type in the unlicensed frequency band. The parameter avoids the conflict resolution; and sends the conflict avoidance parameter to the user equipment UE, so that the UE uses the conflict avoidance parameter to perform conflict resolution according to the current data type in the unlicensed frequency band. Through the foregoing method, the UE may receive the conflict avoidance parameter value of different data types sent by the base station, and use the corresponding conflict avoidance parameter to perform conflict resolution according to the current data type in the unlicensed frequency band. The technical solution provided by the embodiment of the present invention can enable the base station device in the unlicensed frequency band to adopt different conflict avoidance parameters according to the type of data sent. The number of collision avoidance and conflict resolution makes it easier for high priority data types to compete for unlicensed channels, thereby ensuring that high priority services are preferentially served in LTE devices, effectively implementing different types of data transmission in unlicensed frequency bands. stand by.

The ninth embodiment of the present invention provides a terminal device, which is used to implement a collision avoidance method for an unlicensed frequency band according to Embodiments 5 to 7 of the present invention. Referring to FIG. 12, the terminal device may include a receiving unit b10 and a processing unit b20.

The receiving unit b10 is configured to receive a collision avoidance parameter value of the load-based LBT mechanism sent by the base station;

The processing unit b20 is configured to use the received conflict avoidance parameter to perform conflict resolution according to the current data type in the unlicensed frequency band;

The conflict avoidance parameters set by the base station are classified into an uplink conflict avoidance parameter and a downlink conflict avoidance parameter. The conflict avoidance parameter values include a CW initial value, a CW maximum value, a CW increase amplitude value, a maximum channel occupation time, a delay time Defer Period, an initial CCA time, and an extended CCA time. The downlink collision avoidance parameter is used for the base station to perform collision resolution in the unlicensed frequency band, and the uplink collision avoidance parameter is used for the UE to perform collision resolution in the unlicensed frequency band. After determining, by the base station, the uplink collision avoidance parameter according to different types of transmission data, the UE receives the uplink collision avoidance parameter by using the receiving unit b10, so that the UE uses the conflict avoidance parameter to resolve the conflict according to the current data type in the unlicensed frequency band. .

In some feasible implementation manners, the base station may send all the different data types to the UE through the RRC message, that is, the receiving unit b10 obtains the conflict avoidance parameter corresponding to all the data types through the RRC message; then the processing unit b20 automatically transmits the The data type selects a corresponding collision avoidance parameter from all the collision avoidance parameters, or the receiving unit b10 may receive the PDCCH or the EPDCCH DCI sent by the base station to learn the conflict avoidance parameter of the sent data type, so that the processing unit b20 uses the conflict avoidance parameter. Conflict resolution.

In another possible implementation manner, after the base station learns the data type to be sent by the UE, the UE may send the conflict avoidance parameter corresponding to the current data type of the UE to the UE by using an RRC message, and the receiving unit b10 receives the current data to be sent by using the RRC message. Type conflicting avoidance parameters, thus making The processing unit b20 performs conflict resolution.

After the conflict avoidance parameter is obtained, the processing unit a20 uses the conflict avoidance parameter to perform conflict resolution according to the current data type. Specifically, the following conflict resolution method is adopted. Under the load-based LBT mechanism, the conflict resolution is performed before the data is transmitted, and the processing unit a20 monitors whether the channel is idle at the next available initial CCA time, and if the channel is idle, transmits data in the subsequent channel occupation time, otherwise the data is not sent. If the listening channel is busy during the initial CCA time or the data is not transmitted within the channel occupation time, the CCA time is expanded. The processing unit a20 randomly selects a backoff value N from 1 to q, where q is the contention window CW size of the extended CCA time, CW is greater than or equal to 4 and less than or equal to 32. The processing unit a20 detects whether the channel is idle during each extended CCA time, and if the channel is detected to be idle, the value of N is decremented by 1, otherwise the value of N is kept unchanged. In order to share the unlicensed band channel more equitably with the WiFi device, the Defer Period may be started when it is detected that the channel is not idle, and the backoff is continued when the Defer Period ends. When N is reduced to 0, the unlicensed band channel is used to transmit data, otherwise no data is sent. After the data is transmitted, when the processing unit a20 detects the channel conflict, the data transmission is stopped immediately, the processing unit a20 updates the current CW value according to the CW increase amplitude, randomly selects a backoff number N between 1 and the updated CW value, and starts. Retreat.

It can be seen that the terminal device provided by Embodiment 9 of the present invention can receive the conflict avoidance parameter value of different data types sent by the base station, and use the corresponding conflict avoidance parameter to perform conflict resolution according to the current data type in the unlicensed frequency band. The data type with high priority is more likely to compete to the unlicensed channel, thereby ensuring that the high priority service in the UE is preferentially served, and effectively supports different types of data transmission in the unlicensed frequency band.

The tenth embodiment of the present invention provides another base station device, which is used to implement a collision avoidance method for an unlicensed frequency band according to Embodiments 1 to 4 of the present invention. Referring to FIG. 13, the device c00 may include at least one bus c10, at least one processor c20 connected to the bus c10, and at least one memory c30 and a communication interface c40 connected to the bus c20, wherein the processor c20 is called by the bus c10. The code in memory c30 implements the described technical solution.

The conflict avoidance parameter value of the load-based LBT mechanism when the processor c20 sets different data types; The conflict avoidance parameter value includes a CW initial value, a CW maximum value, a CW increase amplitude value, a Defer Period, an initial CCA time, and an extended CCA time; in the unlicensed frequency band, the conflict avoidance parameter is used according to a current data type. Conflict resolution.

After the processor sets the conflict avoidance parameter, the conflict avoidance parameter is sent to the UE through the communication interface c40, so that the UE uses the conflict avoidance parameter to perform conflict resolution according to the current data type in the unlicensed frequency band.

Specifically, the processor c20 may set a collision avoidance parameter used when the collision avoidance is performed in the unlicensed frequency band according to different transmission data types. The type of transmission data can be divided into reference signals, control signaling, and service data. The smaller the collision avoidance parameter value, the easier it is for the device to occupy the channel of the unlicensed band.

The processor c20 may set the collision avoidance parameter value when the reference signal is sent to be less than or equal to the conflict avoidance parameter value when the control signaling is sent, because the transmission delay requirement of the reference signal, the control signaling, and the service data is gradually decreased. Setting the conflict avoidance parameter value when sending the control signaling is less than or equal to the conflict avoidance parameter value when the service data is sent; in addition, since the sending of the uplink data is sent after the base station scheduling, that is, only the scheduling is performed. The UE needs to participate in the uplink LBT channel detection to contend for the channel, so the collision avoidance parameter value of the uplink data transmission is less than or equal to the collision avoidance parameter value when the downlink transmission service data is sent.

For business data with different QoS requirements, the processor c20 can also set different conflict avoidance parameters. Specifically, the smaller the value of the collision avoidance parameter is, the easier the device is to occupy the channel of the unlicensed band, and the smaller the value of the conflict avoidance parameter when the service is sent with higher delay requirements in the QoS requirement, the smaller the value can be. Easy to occupy the channel.

In some feasible implementation manners, the processor c20 may set a maximum channel occupation time of different data types, wherein different maximum channel occupation times may also be set when transmitting data of different QoS services. If the maximum channel occupancy time increases with CW, the device will be less likely to occupy the channel in the event of a collision, which will reduce the device data transmission performance, so the processor c20 can set the maximum channel occupancy time maximum when the maximum channel When the occupation time increases with the increase of CW, the maximum channel occupation time does not exceed the maximum value.

In some feasible implementation manners, the processor c20 may set a collision avoidance parameter value of the unlicensed band according to the number of devices competing for the channel in the unlicensed band, and compete for the channel in the unlicensed band. The more the number of devices, the larger the conflict avoidance parameter is set, making it less likely that the device will compete for the channel. For example, the greater the number of devices competing for channels in the unlicensed band, the larger the CW increase amplitude value is, so that the probability of collision of transmitted data between devices can be reduced.

In other possible implementations, processor c20 determines the collision avoidance parameter value by negotiating with a device that is contending for an unlicensed band channel.

After the conflict avoidance parameter is set, the processor c20 uses the conflict avoidance parameter to perform conflict resolution according to the current data type. Specifically, the following conflict resolution method is adopted. Under the load-based LBT mechanism, the conflict is resolved before the data is sent, and the channel is monitored for idleness at the next available initial CCA time. If the channel is idle, the data is sent during the subsequent channel occupation time, otherwise the data is not sent; When the listening channel is busy at the initial CCA time or the data is not transmitted within the channel occupation time, the CCA time is expanded. The processing unit a10 randomly selects a backoff value N from 1 to q, where q is the contention window CW size of the extended CCA time, CW is greater than or equal to 4 and less than or equal to 32. It is detected whether the channel is idle during each extended CCA time. If the channel is detected to be idle, the value of N is decremented by 1, otherwise the value of N is kept unchanged. In order to share the unlicensed band channel more equitably with the WiFi device, the Defer Period may be started when it is detected that the channel is not idle, and the backoff is continued when the Defer Period ends. When N is reduced to 0, the unlicensed band channel is used to transmit data, otherwise no data is sent. After the data is transmitted, when the channel conflict is detected, the data is immediately stopped, the current CW value is updated according to the CW increase range, and a backoff number N is randomly selected between 1 and the updated CW value to start the backoff.

After the processor c20 determines the uplink collision avoidance parameter according to different types of transmission data, the collision avoidance parameter is sent to the UE through the communication interface b40, so that the UE uses the conflict avoidance according to the current data type in the unlicensed frequency band. The parameters are resolved by conflict.

In some feasible implementation manners, the processor c20 sends an RRC message to the UE by using the communication interface b40 to send a reference signal, control signaling, and service data, and the conflict avoidance parameter when the service data is sent. It includes different said conflict avoidance parameters for transmitting different QoS requirements. The UE selects an appropriate conflict avoidance parameter to perform conflict resolution according to the data type that needs to be sent currently; or, according to the data type to be sent by the current UE, the processor c20 communicates The interface b40 sends the DCI of the PDCCH or the EPDCCH to the UE, where the DCI is used to indicate that the UE uses the collision avoidance parameter of the currently transmitted data type.

In other possible implementation manners, according to the data type that the current UE is to send, the processor c20 sends an RRC message through the communication interface b40 to send the conflict avoidance parameter corresponding to the data type that the UE is currently sending, to the UE, and the reference signal or the reference signal is sent. The collision avoidance parameter when controlling signaling or current QoS service data of the UE is sent to the UE.

It can be seen that the technical solution of the embodiment of the present invention causes the base station to set a collision avoidance parameter value of the LBT mechanism based on the load when the data type is set, and uses the conflict according to the current data type in the unlicensed frequency band. The parameter avoids the conflict resolution; and sends the conflict avoidance parameter to the user equipment UE, so that the UE uses the conflict avoidance parameter to perform conflict resolution according to the current data type in the unlicensed frequency band. Through the foregoing method, the UE may receive the conflict avoidance parameter value of different data types sent by the base station, and use the corresponding conflict avoidance parameter to perform conflict resolution according to the current data type in the unlicensed frequency band. With the technical solution provided by the embodiment of the present invention, the base station device in the unlicensed frequency band can use different conflict avoidance parameters to perform conflict avoidance and conflict resolution according to the type of data to be sent, so that the data type with higher priority is more likely to compete for unauthorized use. The channel ensures that the high priority service in the LTE device is preferentially served, and effectively supports different types of data transmission in the unlicensed band.

The eleventh embodiment of the present invention provides another terminal device, which is used to implement a collision avoidance method for an unlicensed frequency band according to Embodiments 5-7 of the present invention. Referring to FIG. 14, the device d00 may include at least one bus d10, at least one processor d20 connected to the bus d10, and at least one memory d30 and a communication interface d40 connected to the bus d20, wherein the processor d20 is called through the bus d10. The code in memory d30 implements the described technical solution.

The processor d20 receives the conflict avoidance parameter value of the load-based LBT mechanism sent by the base station through the communication interface d40, and then uses the received conflict avoidance parameter to perform conflict resolution in the unlicensed frequency band.

The conflict avoidance parameters set by the base station are classified into an uplink conflict avoidance parameter and a downlink conflict avoidance parameter. The conflict avoidance parameter values include a CW initial value, a CW maximum value, a CW increase amplitude value, a delay time Defer Period, an initial CCA time, and an extended CCA time. The downlink collision avoidance parameter is used for the base station to perform collision resolution in the unlicensed frequency band, and the uplink collision avoidance parameter is used for the terminal to resolve the conflict in the unlicensed frequency band. After the base station determines the uplink conflict avoidance parameter according to different data types, the terminal receives the uplink conflict avoidance parameter through the communication interface d40, so that the UE uses the conflict avoidance parameter to perform conflict resolution according to the current data type in the unlicensed frequency band.

In some feasible implementation manners, the base station may send all the conflict avoidance parameters of different data types to the UE through the RRC message, that is, the processor d20 may receive the RRC message through the communication interface d40 to obtain the conflict avoidance parameter corresponding to all the data types, where The conflict avoidance parameter when sending the service data includes different conflict avoidance parameters for sending different QoS requirements; then the processor d20 selects the corresponding conflict avoidance parameter from all the conflict avoidance parameters according to the current data type, or the processor d20 may The PDCCH DCI sent by the base station is received through the communication interface d40 to learn the conflict avoidance parameter of the sent data type, so that the conflict avoidance parameter is used for conflict resolution.

In another possible implementation manner, after the base station learns the data type to be sent by the UE, the UE may send the conflict avoidance parameter corresponding to the current data type of the UE to the UE by using an RRC message, that is, the processor d20 receives the current to be sent by using the RRC message. The data type corresponds to the conflict avoidance parameter, thereby solving the conflict.

After the conflict avoidance parameter is obtained, the processor d20 uses the conflict avoidance parameter to perform conflict resolution according to the current data type. Specifically, the following conflict resolution method is adopted. Under the load-based LBT mechanism, the conflict is resolved before the data is sent, and the channel is monitored for idleness at the next available initial CCA time. If the channel is idle, the data is sent during the subsequent channel occupation time, otherwise the data is not sent; When the listening channel is busy at the initial CCA time or the data is not transmitted within the channel occupation time, the CCA time is expanded. A backoff value N is randomly selected from 1 to q, where q is the contention window CW size of the extended CCA time, and CW is greater than or equal to 4 and less than or equal to 32. It is detected whether the channel is idle during each extended CCA time. If the channel is detected to be idle, the value of N is decremented by 1, otherwise the value of N is kept unchanged. In order to enjoy the unlicensed band channel more equitably with the WiFi device, the channel non-detection may be detected. The Defer Period is started when idle, and the backoff is continued when the Defer Period ends. When N is reduced to 0, the unlicensed band channel is used to transmit data, otherwise no data is sent. After the data is transmitted, when the channel conflict is detected, the data is immediately stopped, the current CW value is updated according to the CW increase range, and a backoff number N is randomly selected between 1 and the updated CW value to start the backoff.

It can be seen that the terminal device provided by Embodiment 9 of the present invention can receive the conflict avoidance parameter value of different data types sent by the base station, and use the corresponding conflict avoidance parameter to perform conflict resolution according to the current data type in the unlicensed frequency band. The data type with high priority is more likely to compete for the unlicensed channel, so that the high priority service in the LTE device is preferentially served, and the support for different types of data transmission is effectively implemented in the unlicensed band.

Those of ordinary skill in the art will appreciate that various aspects of the present invention, or possible implementations of various aspects, may be embodied as a system, method, or computer program product. Furthermore, aspects of the invention, or possible implementations of various aspects, may take the form of a computer program product, which is a computer readable program code stored in a computer readable medium.

The computer readable medium can be a computer readable data medium or a computer readable storage medium. The computer readable storage medium includes, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing, such as random access memory (RAM), read only memory (ROM), Erase programmable read-only memory (EPROM or flash memory), optical fiber, portable read-only memory (CD-ROM).

The processor in the computer reads the computer readable program code stored in the computer readable medium such that the processor is capable of performing the various functional steps specified in each step of the flowchart, or a combination of steps; A device that functions as specified in each block, or combination of blocks.

The computer readable program code can execute entirely on the user's computer, partly on the user's computer, as a separate software package, partly on the user's own computer and partly on the remote computer, or entirely on the remote computer or server Execute on. It should also be noted that in some alternative implementations, the functions noted in the various steps in the flowcharts or in the blocks in the block diagrams may not occur in the order noted. For example, depending on the functionality involved, the two steps shown in succession, or two blocks may actually be executed substantially concurrently, or the blocks may sometimes be in the reverse order. carried out.

The method and device for data transmission in an unlicensed frequency band disclosed in the embodiment of the present invention are described in detail. The principles and embodiments of the present invention are described in the following. The description of the foregoing embodiment is only used for To help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in specific embodiments and application scopes. It should not be construed as limiting the invention.

Claims (30)

A method for conflict avoidance in an unlicensed frequency band, comprising: Setting a collision avoidance parameter value of the load-based LBT mechanism of the different data types; the conflict avoidance parameter value includes a contention window CW initial value, a CW maximum value, a CW increase amplitude value, a delay time Defer Period, and an initial idle channel. Detecting a CCA time and an extended CCA time; the different data types, including reference signals, control signaling, and service data, where the service data includes service data of different quality of service QoS requirements; In the unlicensed frequency band, the conflict avoidance parameter is used to perform conflict resolution according to a current data type; Sending the conflict avoidance parameter to the user equipment UE, so that the UE uses the conflict avoidance parameter to perform conflict resolution according to the current data type in the unlicensed frequency band. The method of claim 1 wherein The setting the conflict avoidance parameter of the different data types includes: setting the conflict avoidance parameter value when the reference signal is sent is less than or equal to the conflict avoidance parameter value when sending the control signaling; setting the sending control signaling The conflict avoidance parameter value is less than or equal to the conflict avoidance parameter value when the service data is sent; The collision avoidance parameter value when the service transmission data with higher delay requirement in the QoS requirement is set is smaller. The method according to claim 1, wherein the conflict avoidance parameter is used for conflict resolution according to the type of data sent in the unlicensed frequency band, including: Selecting the conflict avoidance parameter of the current data type to start conflict resolution; When the conflict resolution is performed, when it is detected that the channel is not idle, a backoff value N is randomly selected from 1 to CW to start the backoff; Detecting whether the channel is idle in each extended CCA time, and if the channel is detected to be idle, decrementing the N by one; Defer Period is started if it is detected that the channel is not idle, wherein the Defer Period includes M extended CCA times, and M is greater than or equal to 0; after the Defer Period ends, continue to detect each Extending the CCA time, if the channel is detected to be idle, then decrementing the N by one; When the N is reduced to 0, data transmission on the unlicensed band begins. The method according to claim 3, wherein, after the end of the Defer Period, before the continuing to detect the extended CCA time, the method further comprises: If the channel remains idle during the Defer Period, keep the N unchanged, or reduce the N to max[0, (N-M)]; If the channel does not remain idle during the Defer Period, keep the N unchanged and restart the Defer Period. The method according to claim 3, wherein the using the conflict avoidance parameter for conflict resolution according to the current data type in the unlicensed frequency band further includes: After transmitting data on the unlicensed frequency band, if a channel conflict is detected, the data is immediately stopped; The current CW value is updated according to the CW increase amplitude value, and a backoff number N is randomly selected between 1 and the updated CW value to start the backoff. The method according to claim 5, wherein if the channel conflict is detected, the data transmission is stopped immediately, including: When the number of hybrid automatic repeat request HARQ response ACKs of the UE is not received exceeds a specified threshold, and the channel occupation time reaches the specified time threshold, the data transmission is stopped immediately. The method according to claim 1 or 2, wherein the sending the conflict avoidance parameter to the user equipment UE comprises: Transmitting the conflict avoidance parameter of different data types to the UE by using a radio resource control RRC message; or The conflict avoidance parameter of the current data is sent to the UE by using an RRC message. The method according to claim 7, wherein after the RRC message is used to send the conflict avoidance parameter of a different data type to the UE, the method further includes: The downlink control information DCI through the physical downlink control channel PDCCH or the enhanced physical downlink control channel EPDCCH indicates that the UE performs collision resolution using the collision avoidance parameter of the current data type. The method according to claim 1, wherein the setting of conflict avoidance parameter values of the load-based LBT mechanism of different data types comprises: Setting the maximum channel occupation time of different data types increases as the CW of sending different data types increases; When the maximum channel occupation time exceeds the designated channel occupation time with the increase of the CW, the maximum channel occupation time is set as the designated channel occupation time. A method for conflict avoidance in an unlicensed frequency band, which is used in a terminal device, and includes: Receiving a collision avoidance parameter value of the load-based LBT mechanism sent by the base station; In the unlicensed frequency band, the conflict avoidance parameter is used to perform conflict resolution according to a current data type; The conflict avoidance parameter value includes a CW initial value, a CW maximum value, a CW increase amplitude value, a Defer Period, an initial CCA time, and an extended CCA time; the different data types include reference signals, control signaling, and service data, The service data includes service data of different quality of service QoS requirements. The method according to claim 10, wherein the receiving the collision avoidance parameter value of the load-based LBT mechanism sent by the base station comprises: Receiving, by using an RRC message, the conflict avoidance parameter of different data types sent by the base station; or The conflict avoidance parameter of the current data type sent by the base station is received by the RRC message. The method according to claim 11, wherein after receiving the conflict avoidance parameter of different data types sent by the base station by using an RRC message, before the conflict resolution using the received conflict avoidance parameter is performed, The method also includes: Receiving a DCI of a PDCCH or an EPDCCH sent by the base station, where the DCI is used to indicate that the conflict avoidance parameter of the current data type is used for conflict resolution. The method according to claim 10, wherein the using the conflict avoidance parameter to perform conflict resolution according to a current data type comprises: Selecting the conflict avoidance parameter using the current data type; When the conflict resolution is performed, when it is detected that the channel is not idle, a backoff value N is randomly selected from 1 to CW to start the backoff; Detecting whether the channel is idle in each extended CCA time, and if the channel is detected to be idle, decrementing the N by one; Dee Period is started if it is detected that the channel is not idle, wherein the Defer Period includes M extended CCA times, and M is greater than or equal to 0; after the Defer Period ends, each extended CCA time is continuously detected, and if the channel is detected If it is idle, the N is decremented by 1; When the N is reduced to 0, data transmission on the unlicensed band begins. The method according to claim 13, wherein after the end of the Defer Period, before the continuing to detect the extended CCA time, the method further comprises: If the channel remains idle during the Defer Period, keep the N unchanged, or reduce the N to max[0, (N-M)]; If the channel does not remain idle during the Defer Period, keep the N unchanged and restart the Defer Period. The method according to claim 14, wherein the using the conflict avoidance parameter to perform conflict resolution according to a current data type further includes: After transmitting data on the unlicensed frequency band, if a channel conflict is detected, the data is immediately stopped; The current CW value is updated according to the CW increase amplitude value, and a backoff number N is randomly selected between 1 and the updated CW value to start the backoff. A base station device, comprising: a processing unit, configured to set a collision avoidance parameter value of a load-based LBT mechanism of different data types; the conflict avoidance parameter value includes a CW initial value, a CW maximum value, a CW increase amplitude value, a Defer Period, an initial CCA time, and an extended CCA Time; the different data types, including reference signals, control signaling, and service data, where the service data includes service data of different quality of service QoS requirements; The processing unit is further configured to: use the conflict avoidance parameter to perform conflict resolution according to a current data type in the unlicensed frequency band; And a sending unit, configured to send the conflict avoidance parameter to the UE, so that the UE uses the conflict avoidance parameter to perform conflict resolution according to the sent data type in the unlicensed frequency band. The device according to claim 16, wherein the processing unit is specifically configured to: Setting the conflict avoidance parameter value when the reference signal is sent is less than or equal to the conflict avoidance parameter value when the control signaling is sent; setting the conflict avoidance parameter value when sending the control signaling is less than or equal to when the service data is sent The conflict avoidance parameter value; The collision avoidance parameter value when the service transmission data with higher delay requirement in the QoS requirement is set is smaller. The device according to claim 16, wherein the processing unit is specifically configured to: Selecting the conflict avoidance parameter of the current data type to start conflict resolution; When the conflict resolution is performed, when it is detected that the channel is not idle, a backoff value N is randomly selected from 1 to CW to start the backoff; Detecting whether the channel is idle in each extended CCA time, and if the channel is detected to be idle, decrementing the N by one; Dee Period is started if it is detected that the channel is not idle, wherein the Defer Period includes M extended CCA times, and M is greater than or equal to 0; after the Defer Period ends, each extended CCA time is continuously detected, and if the channel is detected If it is idle, the N is decremented by 1; When the N is reduced to 0, data transmission on the unlicensed band begins. The device according to claim 18, wherein the processing unit is further configured to: If the channel remains idle during the Defer Period, keep the N unchanged, or reduce the N to max[0, (N-M)]; If the channel does not remain idle during the Defer Period, keep the N unchanged and restart the Defer Period. The device according to claim 18, wherein the processing unit is further configured to: After transmitting data on the unlicensed frequency band, if a channel conflict is detected, the number of transmissions is stopped immediately. according to; The current CW value is updated according to the CW increase amplitude value, and a backoff number N is randomly selected between 1 and the updated CW value to start the backoff. The device according to claim 20, wherein the processing unit is specifically configured to: When the number of HARQ ACKs that have not received the UE exceeds a specified threshold, and the channel occupation time reaches the specified time threshold, the data transmission is stopped immediately. The device according to claim 16 or 17, wherein the sending unit is specifically configured to: Sending the conflict avoidance parameter of different data types to the UE by using an RRC message; or The conflict avoidance parameter of the current data type is sent to the UE by using an RRC message. The device according to claim 22, wherein the sending unit is further configured to: The DCI through the PDCCH or the EPDCCH indicates that the UE performs collision resolution using the collision avoidance parameter of the current data type. The device according to claim 16, wherein the processing unit is specifically configured to: Setting the maximum channel occupation time of different data types increases as the CW of different data types increases; When the maximum channel occupation time exceeds the designated channel occupation time with the increase of the CW, the maximum channel occupation time is set as the designated channel occupation time. A terminal device, comprising: a receiving unit, configured to receive a collision avoidance parameter value of the load-based LBT mechanism sent by the base station; a processing unit, configured to use the conflict avoidance parameter received by the receiving unit to perform conflict resolution according to a current data type in the unlicensed frequency band; The conflict avoidance parameter value includes a CW initial value, a CW maximum value, a CW increase amplitude value, a delay time Defer Period, an initial CCA time, and an extended CCA time; the different data types include reference signals, control signaling, and services. Data, the service data including service data of different quality of service QoS requirements. The device according to claim 25, wherein the receiving unit is specifically configured to: Receiving, by using an RRC message, the conflict avoidance parameter of different data types sent by the base station; or The conflict avoidance parameter of the current data type sent by the base station is received by the RRC message. The device according to claim 26, wherein the receiving unit is further configured to: Receiving a DCI of a PDCCH or an EPDCCH sent by the base station, where the DCI is used to indicate that the conflict avoidance parameter of the current data type is used for conflict resolution. The device according to claim 25, wherein the processing unit is specifically configured to: The root selects the conflict avoidance parameter using the current data type; When the conflict resolution is performed, when it is detected that the channel is not idle, a backoff value N is randomly selected from 1 to CW to start the backoff; Detecting whether the channel is idle in each extended CCA time, and if the channel is detected to be idle, decrementing the N by one; Dee Period is started if it is detected that the channel is not idle, wherein the Defer Period includes M extended CCA times, and M is greater than or equal to 0; after the Defer Period ends, each extended CCA time is continuously detected, and if the channel is detected If it is idle, the N is decremented by 1; When the N is reduced to 0, data transmission on the unlicensed band begins. The device according to claim 28, wherein the processing unit is further configured to: If the channel remains idle during the Defer Period, keep the N unchanged, or reduce the N to max[0, (N-M)]; If the channel does not remain idle during the Defer Period, keep the N unchanged and restart the Defer Period. The device according to claim 28, wherein the processing unit is further configured to: After transmitting data on the unlicensed frequency band, if a channel conflict is detected, the data is immediately stopped; The current CW value is updated according to the CW increase amplitude value, and a backoff number N is randomly selected between 1 and the updated CW value to start the backoff.

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