WO2017075774A1

WO2017075774A1 - Clear channel assessment method and network node

Info

Publication number: WO2017075774A1
Application number: PCT/CN2015/093778
Authority: WO
Inventors: 李�远; 李强; 马莎
Original assignee: 华为技术有限公司
Priority date: 2015-11-04
Filing date: 2015-11-04
Publication date: 2017-05-11
Also published as: CN108141881A

Abstract

Disclosed is a clear channel assessment method, capable of increasing the carrier utilization rate. The method of the present invention comprises: performing, from an initial time slot, clear channel assessment on a first set of carriers; when the first set of carriers is idle at a current time slot, using the first set of carriers to transmit information at a next time slot of the current time slot; and when the first set of carriers is busy at the current time slot, continuously performing clear channel assessment on the first set of carriers at a next time slot until the current time slot becomes an end time slot. The present invention also provides a network node that is able to implement the method.

Description

Method for evaluating idle channel and network node

Technical field

The present invention relates to the field of wireless communications, and in particular, to a method and a network node for evaluating an idle channel, and specifically for an idle channel estimation method and a network node based on an unlicensed spectrum.

Background technique

Clear Channel Assessment (CCA) refers to a technique for detecting a communication channel by a wireless communication device. When the communication channel is idle, the wireless communication device can occupy the communication channel to transmit information. When the communication channel is busy, the indication is Other wireless communication devices may occupy the communication channel and may not be occupied. Commonly used idle channel estimation techniques include energy threshold detection method, IEEE characteristic signal detection method, and the like.

In the broadband multi-carrier technology of Licensed-Assisted Access using Long Term Evolution (LAA-LTE), the idle channel estimation method is roughly as follows: for a single carrier, the network node performs extended expansion idle. After the extended clear channel assessment (eCCA), the single-slot CCA is executed. If the carrier status is detected as being idle in the single-slot CCA, the channel is occupied in the next time slot and the information is sent, as shown in FIG. 1; For each carrier, the network node independently performs eCCA for each carrier, and sets the carrier of the eCCA to wait state first, and waits for eCCA to be performed for other carriers. After completing eCCA for all carriers, the single-slot CCA is executed. When all the carrier states are detected as being idle in the time slot CCA, all carrier transmission information is occupied in the next time slot, as shown in FIG. 2 .

The prior art scheme does not make full use of the carrier, thus causing waste of channel resources.

Summary of the invention

It is an object of the present invention to provide an idle channel evaluation method capable of improving carrier utilization.

The first aspect provides a method for evaluating a clear channel, including the following steps: a first network node starts from an initial time slot, performs idle channel estimation on a first carrier set in a current time slot, and is idle when the first carrier set is in a current time slot. And transmitting information according to the first carrier set in the next time slot of the current time slot; when the first time set is busy in the current time slot, performing idle channel estimation on the first carrier set in the next time slot of the current time slot Until the current time slot is the end time slot. The first carrier set includes at least one carrier. The first network node is a communication device that can perform idle channel estimation on the carrier, and may be the following One of them: a base station (BS), a micro base station, a pico base station, a home base station, a remote radio head, or a relay. The first network node may continuously perform idle channel estimation on the first carrier set until the state of the first carrier set is that the channel is idle, and the information is transmitted by using the first carrier set, thereby improving carrier utilization.

According to the first aspect, in the first implementation manner of the idle channel estimation method, when the preset time period in which the first network node performs the idle channel estimation on the first carrier set is the first time to the second time, The initial time of the idle channel evaluation is after the first time, and the end time slot of the idle channel evaluation is before the second time.

According to the first aspect, in a second implementation manner of the idle channel estimation method, the first network node starts from an initial time slot, and determines whether a sum of received energy of each carrier in the first carrier set in the current time slot is smaller than the first The preset energy threshold, if the sum of the received energy of each carrier in the current time slot is less than the first preset energy threshold, the information is sent by using the first carrier set in the next time slot of the current time slot, if the first carrier If the sum of the received energy of each carrier in the current time slot is not less than the first preset energy threshold, the idle channel estimation is performed on the first carrier set in the next time slot of the current time slot until the current time slot is the end time slot. The first carrier set includes multiple carriers.

According to the first aspect, in a third implementation manner of the idle channel estimation method, the first network node starts from an initial time slot, and detects received energy of each carrier in the first carrier set in the current time slot, and receives energy and The second preset energy threshold is compared. If the received energy is all lower than the second preset energy threshold, the information is sent by using the first carrier set in the next time slot of the current time slot. If the received energy is not all lower than the second energy threshold, Then, the first carrier set is subjected to idle channel estimation in the next time slot of the current time slot until the current time slot is the end time slot, wherein the first carrier set includes multiple carriers.

According to the first aspect, or any one of the foregoing implementation manners, in the fourth implementation manner of the idle channel estimation method, the first network node determines the number of target carriers, and determines the first carrier in the current time slot. Whether the number of sets of carriers is not less than the number of target carriers, and if so, transmitting information using the first carrier set in the next time slot of the current time slot, and if not, performing idle channel on the first carrier set in the next time slot of the current time slot Evaluation, wherein the first set of carriers comprises a plurality of carriers. When the service needs to pass a certain number of carriers to ensure transmission efficiency, the first network node can process the service by using the first carrier set exceeding the preset number of carriers, so that the efficiency of the transmitted information can meet the service requirement.

According to a fourth implementation manner of the first aspect, the fifth implementation of the idle channel estimation method In the mode, the first network node determines the target carrier set from the first carrier set, occupies all the carriers in the target carrier set in the next time slot of the current time slot, and sends information, where the number of carriers of the target carrier set is equal to the target carrier number. The first network node can utilize a fixed number of carriers to transmit information to reduce fluctuations in transmit power during transmission of the information.

According to a fifth implementation manner of the first aspect, in a sixth implementation manner of the idle channel estimation method, the method further includes: the first network node sends the target carrier number to the second network node, and receives the second The target channel measurement information sent by the network node selects a modulation and coding strategy according to the target channel measurement information, where the target carrier number is used by the second network node to correct the channel measurement information to obtain the target channel measurement information. The second network node may modify the channel measurement information according to the target carrier number, and the first network node may select a Modulation and Coding Scheme (MCS) according to the modified channel measurement information, thereby improving the accuracy of selecting the MCS.

According to the first aspect, or any one of the foregoing implementation manners, in the seventh implementation manner of the idle channel estimation method, the first network node performs the idle channel assessment on the second carrier set in the current time slot, When the first carrier set is busy in the current time slot and the second carrier set is idle in the current time slot, the first network node transmits information by using the second carrier set in the next time slot of the current time slot, where the second carrier set The at least one carrier is included, and the second carrier set configures a part of carriers in the carrier for the first network node.

According to the seventh implementation manner of the first aspect, in the eighth implementation manner of the idle channel estimation method, the first network node determines the number of target carriers, and determines whether the number of carriers of the second carrier set in the current time slot is not Less than the number of target carriers, if yes, the second carrier set is used to transmit information in the next time slot of the current time slot, and if not, the second channel set is subjected to idle channel estimation in the next time slot of the current time slot, wherein, second The carrier set includes a plurality of carriers.

According to the eighth implementation manner of the first aspect, in a ninth implementation manner of the idle channel estimation method, the first network node determines the target carrier set from the second carrier set, and occupies the target in the next time slot of the current time slot. All carriers in the carrier set and transmit information, wherein the number of carriers of the target carrier set is equal to the number of target carriers.

A second aspect of the present invention provides a method for evaluating an idle channel, comprising the steps of:

The second network node receives the number of target carriers sent by the first network node, and the information sent by the first network node by using the carrier, and measures the carrier to obtain channel measurement information, and the channel is compared according to the number of target carriers. The measurement information is compensated and calculated to obtain target channel measurement information, and the target channel measurement information is sent to the first network node. The second network node is a user equipment such as a mobile phone, a laptop, a tablet, and the like. If the first network node uses different numbers of carriers in the process of transmitting information, the channel measurement result of the second network node to the carrier may change, and the second network node may perform channel measurement results according to the number of carriers used to transmit the information. Corrected. The second network node may modify the channel measurement information according to the target carrier number, and the first network node may select the MCS according to the modified channel measurement information. For example, the second network node determines the compensation power gain according to the target carrier number, according to the channel state information. (Channel State Information, CSI) and compensation power gain calculation to obtain the target CSI.

A third aspect of the invention provides a first network node comprising a receiver, a transmitter, a memory and a processor. The memory is for storing instructions, the processor is for executing instructions, the receiver and the transmitter are controlled by the processor, and when the processor executes the instructions, causing the processor to perform the first aspect of the idle channel evaluation method.

A fourth aspect of the invention provides a second network node comprising a receiver, a transmitter, a memory and a processor. The memory is for storing instructions, the processor is for executing instructions, the receiver and the transmitter are controlled by the processor, and when the processor executes the instructions, causing the processor to perform the second aspect of the idle channel evaluation method.

A fifth aspect of the present invention provides a first network node, comprising means for implementing the idle channel estimation method of the first aspect.

A sixth aspect of the present invention provides a second network node, comprising means for implementing the idle channel estimation method of the second aspect.

As can be seen from the above technical solutions, the present invention has the following advantages:

The first network node performs idle channel estimation on the first carrier set from the initial time slot, the first carrier set includes at least one carrier, and if the first carrier set is idle in the current time slot, the next time slot in the current time slot The information is transmitted by using the first carrier set; if the first carrier set is busy in the current time slot, the idle channel estimation of the first carrier set is continued in the next time slot until the current time slot is the end time slot. The invention can continuously perform idle channel estimation on the carrier, and when the carrier state is idle, the carrier can be immediately used to transmit information, thereby improving the utilization of the carrier.

DRAWINGS

1 is a schematic diagram of a method for evaluating an idle channel in the prior art;

2 is another schematic diagram of a prior art idle channel estimation method;

3 is a schematic diagram of an application scenario in an embodiment of the present invention;

4 is another schematic diagram of an application scenario in an embodiment of the present invention;

FIG. 5 is another schematic diagram of an application scenario according to an embodiment of the present invention;

6 is a schematic diagram of an uplink and downlink transmission format of a data frame according to an embodiment of the present invention;

FIG. 7 is another schematic diagram of an uplink and downlink transmission format of a data frame according to an embodiment of the present invention; FIG.

8 is a schematic diagram of pilot interference in an existing idle channel estimation method;

9 is another schematic diagram of a method for evaluating a clear channel in the prior art;

FIG. 10 is a schematic structural diagram of a first network node according to an embodiment of the present invention;

FIG. 11 is a schematic structural diagram of a second network node according to an embodiment of the present invention;

FIG. 12 is a schematic flowchart of a method for evaluating an idle channel according to an embodiment of the present invention;

[Correct according to Rule 26 09.12.2015]
FIG. 13 is another schematic flowchart of a method for evaluating an idle channel according to an embodiment of the present invention;

FIG. 14 is a schematic diagram of a VCCA according to an embodiment of the present invention; FIG.

15 is another schematic diagram of combining eCCA and VCCA in an embodiment of the present invention;

16 is another schematic diagram of combining eCCA and VCCA in an embodiment of the present invention;

17 is another schematic diagram of combining eCCA and VCCA in an embodiment of the present invention;

FIG. 18 is another schematic diagram of combining eCCA and VCCA in an embodiment of the present invention; FIG.

FIG. 19 is another schematic structural diagram of a first network node according to an embodiment of the present invention;

20 is another schematic structural diagram of a first network node according to an embodiment of the present invention;

FIG. 21 is another schematic structural diagram of a second network node according to an embodiment 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, but not all embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The application scenario of the present invention is described below. The present invention is applicable to an LTE system based on an unlicensed spectrum, that is, a LAA-LTE system. The LAA-LTE system may aggregate multiple carriers (such as an unlicensed carrier and a licensed carrier, an unlicensed carrier and an unlicensed carrier) by using Carrier Aggregation (CA) technology. The carrier allocation scenario includes: 1. Licensed spectrum And the unlicensed spectrum co-site deployment, that is, the licensed spectrum and the unlicensed spectrum are aggregated by the same transmitting node, the node sets the licensed carrier to PCC, and sets the unlicensed carrier to SCC, as shown in Figure 3; 2. License spectrum and Unlicensed spectrum non-co-location deployment, such as licensed spectrum deployment at macro base stations, and unlicensed spectrum deployed at low power nodes, For example, a micro cell, a pico cell, a femto cell, a remote radio head, a relay, etc., between a macro base station and a low power node pass ideal or Non-ideal backhaul link connections, as shown in Figure 4; 3. Unlicensed spectrum is deployed independently on the sending node, ie the base station uses only the unlicensed spectrum, not the licensed spectrum, as shown in Figure 5. The uplink and downlink transmission of the present invention may be in the form of Time Division Duplexing (TDD) on the same carrier, as shown in FIG. 6, or may be completely downlink (Supplyal DownLink, SDL) transmission, as shown in FIG. 7.

The existing channel access mechanism is based on a load-based device (LBE) policy. The LBE policy uses a Listen-Before-Talk (LBT) channel access mechanism. In the case of a channel, a single-slot CCA is first performed on the carrier. If the channel is detected to be idle, data can be transmitted. If the channel is detected to be occupied, an eCCA is entered, and the counter variable N is initialized to a random integer between 1 and q. q is the Contention Window Size (CWS), refer to FIG. 8, where q=16, N=4, the base station performs channel interception on a single carrier in each time slot, and if the channel is detected to be idle, N is decremented by one, and the base station occupies the channel to transmit information until N returns to zero; when the base station ends the current channel occupation but still needs to continue transmitting data, an eCCA is executed for the next data transmission listening channel. In this channel access mode, the base station needs to set a counter for each carrier until the counter is zeroed to occupy the channel. When the channel is idle and the counter is not reset to zero, the base station cannot occupy the channel, so the channel utilization rate is not high.

When the LBE process is performed on multiple carriers according to the LBE channel access mechanism, since the random values of the counters of different carriers are different and the busy state of the channel is different, the time for the terminal to contend for the channel through different carriers is preceded. The base station transmitting data to the terminal that first contends to the channel may generate more serious adjacent channel interference in the adjacent frequency domain carrier, thereby affecting the accuracy of the adjacent carrier sensing channels, that is, the base station is listening on these adjacent carriers. The signal energy mainly comes from the adjacent frequency leakage of the transmitting data carrier instead of the transmission of the surrounding coexistence node, so that the base station cannot use these adjacent carriers to transmit information, which seriously affects the carrier utilization, as shown in FIG.

In addition, in the current 802.11ac broadband multi-carrier channel access mechanism, the plurality of available carriers of the 802.11ac include at least one 20 MHz primary channel (PCH) and a non-primary channel (NCH). Referring to FIG. 9, the base station performs a single-slot listening on the PCH and the NCH. If the single-slot detects that the NCH is idle, the NCH is immediately accessed. Otherwise, Cannot access the NCH. In this method, a PCH needs to be configured, and the base station performs channel listening based on the listening back-off only on the PCH. When the PCH is busy, even if the NCH is all idle, the base station cannot send information through the idle NCH, and the NCH is utilized. The rate is very low. At the same time, the base station performs only one-slot snooping and can only access the NCH that is idle at the same time as the PCH, so the probability of accessing the NCH is small.

When the network node detects that the single carrier or multi-carrier state is busy in the single-slot CCA, even if the state of the single carrier or multi-carrier is idle in the next slot, the network node will compete in the next slot including the above. Backing up within the window length, or waiting for a period of time to execute the next eCCA, thus causing waste of channel resources.

In order to improve the utilization of the carrier, the present invention provides a method for evaluating a clear channel and a network node, and the method and the network node can be used for an idle channel estimation method based on the unlicensed spectrum and a network node. The following describes the network node in the embodiment of the present invention. Referring to FIG. 10, the first network node 1000 includes at least one receiver 1001, at least one transmitter 1002, at least one processor 1003, and at least one memory 1004. The receiver 1001, the transmitter 1002, the processor 1003, and the memory 1004 are connected by a bus. The receiver 1001, the transmitter 1002, the processor 1003, and the memory 1004 in FIG. 10 are exemplified by one;

The receiver 1001 and the transmitter 1002 are configured to receive and transmit data frames, and support communication with transmitters and/or receivers of other network nodes. The receiver and transmitter can be stand-alone devices or can be transceivers with integrated receive and transmit functions.

The processor 1003 is configured to process a data frame or a data packet, and use CCA-Energy Detection (CCA-ED) to determine the state of the carrier, and also to select at least one carrier according to the carrier state, according to the carrier status. Communicate with other network nodes. The processor 1003 may be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.

The memory 1004 stores instructions and programs. In particular, the program can include program code, which can include computer operating instructions. The memory 1004 may include a random access memory (RAM), and may also include a non-volatile memory (Non-Volatile Memory), such as a disk storage, a USB flash disk, and an SD card (Secure Digital Memory). Card) and so on.

Before the first network node 1000 formulates the MCS, it is required to receive channel measurement information of the second network node for the carrier, where the second network node is a user equipment, such as a mobile device, a notebook computer, a tablet computer, or the like. The structure of the second network node 1100 is as shown in FIG.

The second network node 1100 includes at least one receiver 1101, at least one transmitter 1102, at least one processor 1103, and at least one memory 1104. The receiver 1101, the transmitter 1102, the processor 1103, and the memory 1104 are connected by a bus. The receiver 1101, the transmitter 1102, the processor 1103, and the memory 1104 in FIG. 11 take one as an example, and the second network node 1100 can A network node 1000 transmits a carrier for transmitting information, and feeds back the measurement result.

It can be understood that the LAA-LTE system can include a plurality of first network nodes 1000 and a plurality of second network nodes 1100. Each of the first network node and the second network node has an associated antenna or antenna array that can communicate with the wireless communication device in its scope. Typically, the second network node registers with the first network node to receive the service from the communication system. For direct connections (ie, point-to-point communication), the second network node communicates directly via the assigned channel. Any different first network node or second network node may include a processor, a receiver, and a transmitter to support communication with any other network node.

Referring to FIG. 12, the first network node 1000 in the embodiment shown in FIG. 10 introduces the idle channel estimation method in the present invention. One embodiment of the idle channel estimation method in the present invention includes:

S1201: The first network node starts from the initial time slot, and performs idle channel estimation on the first carrier set in the current time slot. When the first carrier set is idle in the current time slot, step S1202 is performed, when the first carrier set is in When the current time slot is busy, step S1203 is performed;

The first carrier set is a part of the carrier of the first network node, and the number of the carriers may be one or more. The channel width of the carrier may be the same or different, which is not limited herein.

Specifically, the first network node may perform idle channel estimation on the first carrier set in the current time slot by using the processor 1003, and the processor 1003 detects that all carriers in the first carrier set are in the current time slot. When idle, the first carrier set is determined to be idle in the current time slot, and step S1202 is performed; when the processor 1003 detects that one or more carriers in the first carrier set are busy in the current time slot, the first carrier set is at the current time. The gap is determined to be busy, and step S1203 is performed.

The first network node performs the idle channel assessment on the first carrier set in the current time slot, and may pass multiple The way to achieve, you can refer to the following implementation:

The first network node determines, from the initial time slot, whether the sum of the received energy of each carrier in the first carrier set in the current time slot is less than a first preset energy threshold, if each carrier in the first carrier set receives energy in the current time slot. And being less than the first preset energy threshold, determining that the first carrier set is idle in the current time slot, and if the sum of the received energy of each carrier in the current time slot in the first carrier set is not less than the first preset energy threshold, determining A carrier set is busy in the current time slot. The first preset energy threshold refers to an idle channel assessment energy threshold corresponding to the first carrier set.

Specifically, the first preset energy threshold may be a sum of corresponding energy thresholds of each carrier in the first carrier set. The energy thresholds of the single carriers may be the same or different, and are not limited herein.

Generally, the idle channel evaluation mode for a single carrier is CCA-Energy Detection (CCA-ED), that is, the first network node detects the received energy in a CCA or eCCA time slot and normalizes it into power. The received power value is compared with a predefined power threshold. If the predefined power threshold is exceeded, it is determined that the channel is occupied, and vice versa. In this embodiment, when the sum of the received energy of each carrier in the current time slot is greater than the first preset energy threshold, it indicates that at least one carrier in the first carrier is busy in the current time slot, then the first carrier The set is determined to be busy in the current time slot, whereas the first set of carriers is determined to be idle in the current time slot.

Or the first network node starts from the initial time slot, detects the received energy of each carrier in the first carrier set in the current time slot, and compares the received energy with the second preset energy threshold, if the received energy is lower than the second preset. The energy threshold determines that the first carrier set is idle in the current time slot. If the received energy is not all lower than the second energy threshold, determining that the first carrier set is busy in the current time slot.

The second energy threshold refers to a CCA-ED threshold corresponding to a single carrier. If the received energy detected by each carrier in the first carrier set is lower than a preset second energy threshold, it indicates that the first carrier is concentrated. Each carrier is idle in the current time slot, and the first carrier set is determined to be in an idle state in the current time slot; if the received energy of any one carrier in the first carrier set is greater than a preset second energy threshold, At least one carrier in a carrier set is busy in the current time slot, and then the first carrier set is determined to be busy in the current time slot. For example, the first carrier set includes the carrier CC1 and the carrier CC2. The first network node may determine the state of the CC1 by using the energy threshold 1 by the processor 1003, and determine the state of the CC2 by using the energy threshold 2. If the CC1 is busy and the CC2 is idle, it indicates The first carrier is busy, and only when both CC1 and CC2 are idle, indicating that the first carrier set is idle.

S1202: When the first carrier set is idle in the current time slot, the information is sent by using the first carrier set in the next time slot of the current time slot;

The transmitter 1002 of the first network node may transmit information by using all or part of carriers in the first carrier set under the control of the processor 1003.

S1203: When the first carrier set is busy in the current time slot, perform idle channel estimation on the first carrier set in the next time slot of the current time slot until the current time slot is an end time slot.

Optionally, in another embodiment of the present invention, when the preset time period in which the first network node performs the idle channel assessment on the first carrier set is the first time to the second time, the initial time is at the first time. Thereafter, the end slot is before the second moment.

For example, the base station may send a Dedicated Reference Signal (DRS) at intervals, and the independent DRS may be sent at any one time in a time period, and is not limited to a fixed time. Assuming that the above time period is [T1, T2], [T3, T4], the idle channel estimation needs to be performed on the carrier before the independent DRS is transmitted, and the independent DRS is not allowed to continue to be transmitted during the time period (T2, T3), so it is idle. The time for channel evaluation is limited to the [T1, T2] and / or [T3, T4] time periods. In practical applications, if the network node uses other carriers to transmit other information and has similar time constraints, the time limit for the network node to perform idle channel estimation on the plurality of carriers is similar.

Optionally, in another embodiment of the present invention, the first network node performs idle channel estimation on the second carrier set in the current time slot; when the first carrier set is busy in the current time slot and the second carrier set is in the current When the time slot is idle, the first network node transmits information using the second carrier set in the next time slot of the current time slot.

The second carrier set includes at least one carrier, and the second carrier set is a partial carrier in the first network node configuration carrier. For example, the carrier configured by the first network node includes CC1, CC2, CC3, and CC4, the first carrier set is {CC1, CC2, CC3}, and the second carrier set is {CC2, CC3, CC4}, in the current time slot. When the carrier CC1 is busy and the carriers CC2, CC3, and CC4 are idle, the first carrier set is busy, the second carrier set is idle, and the first network node can use the second carrier set to send information. It should be noted that the number of carriers in the first carrier set and the second carrier set may be the same or different, and is not limited herein.

Further, the first network node sends information by using the second carrier set in the next time slot of the current time slot. The method includes: determining, by the first network node, the number of target carriers, determining whether the number of carriers of the second carrier set in the current time slot is not less than the number of target carriers, and if so, triggering the first network node to use the next time slot of the current time slot. The step of transmitting information by the second carrier set, if not, performing idle channel estimation on the second carrier set in the next time slot of the current time slot. The second carrier set includes multiple carriers.

Further, the first network node transmitting information by using the second carrier set in the next time slot of the current time slot may be implemented by: determining, by the first network node, the target carrier set from the second carrier set, and the number of carriers of the target carrier set Equal to the number of target carriers, occupying all carriers in the target carrier set and transmitting information in the next slot of the current slot.

Specifically, the specific process of the first network node performing the idle channel estimation on the second carrier set is similar to the process of performing the idle channel estimation on the first carrier set. Referring to the method embodiment shown in FIG. 12, details are not described herein again.

The following describes the method for evaluating the idle channel in the embodiment of the present invention according to the first network node 1000 and the second network node 1100. Referring to FIG. 13, another embodiment of the method for evaluating the idle channel in the embodiment of the present invention includes:

S1301: The first network node starts from the initial time slot, and performs idle channel estimation on the first carrier set in the current time slot. When the first carrier set is idle in the current time slot, step S1302 is performed, when the first carrier set is in When the current time slot is busy, step S1301 is performed;

In this embodiment, when the first carrier set is busy in the current time slot, the first carrier set is subjected to idle channel estimation in the next time slot of the current time slot until the current time slot is the end time slot. Step S1301 is similar to step S1201 in the embodiment shown in FIG. 12, and details are not described herein again.

S1302: When the first carrier set is idle in the current time slot, the first network node determines the target carrier number;

If the processor 1003 detects that the first carrier set is idle in the current time slot, the processor 1003 may determine the target carrier number according to the number of carriers in the first carrier set, and the number of target carriers is not greater than the number of carriers in the first carrier set.

S1303: The first network node determines whether the number of carriers of the first carrier set in the current time slot is not less than the target carrier number, if yes, step S1304 is performed, and if not, executing other processes;

In an actual application, if there is no limitation on the number of carriers in the first carrier set, the embodiment may also directly perform step S1304 without performing step S1303. In practical applications, if the business needs The multiple carriers that are greater than or equal to the number of target carriers ensure the efficiency of information transmission. When the number of carriers in the first carrier set is smaller than the number of target carriers, it indicates that the first carrier set does not satisfy the condition of service processing, and the first network node may be in the next time. The gap continues to perform the idle channel evaluation on the first carrier set, and the idle channel evaluation may also be stopped, and other processes may be performed, which are not limited herein.

S1304. The first network node determines a target carrier set from the first carrier set, and occupies all carriers in the target carrier set in a next time slot of the current time slot and sends information.

Specifically, the first network node may set the target carrier number according to the network load condition, and determine the target carrier set from the first carrier set according to the target carrier number, where the number of carriers of the target carrier set is equal to the target carrier number, and if the network is busy, the first network node The target carrier number can be set to a smaller value, for example, 2 or 3. If the network is idle, the first network node can set the target carrier number to a larger value, for example, 8, 9, or 10, the specific value here. Not limited.

S1305. The first network node sends the target carrier number to the second network node.

Specifically, the target carrier number is used by the second network node to modify the channel measurement information to obtain the target channel measurement information. After the first network node determines the target carrier number by the processor 1003, the target carrier number is sent to the second network node. There is no fixed sequence between step S1305 and step 1303 to step 1304. The specific execution sequence is not limited herein.

It should be noted that when the number of carriers used by the first network node to transmit information changes frequently, the number of target carriers can be carried in a common search space of a physical downlink control channel (PDCCH); the number of carriers used when transmitting information When the semi-static changes, the first network node can carry the number of carriers through RRC signaling.

S1401: The second network node measures the carrier to obtain channel measurement information.

Specifically, after the receiver 1101 of the second network node can receive the information sent by the transmitter 1002 of the first network node, the second network node can measure the carrier carrying the information by using the processor 1203 to obtain channel measurement information. Channel measurement information includes Channel State Information (CSI), Radio Resource Management (RRM), Reference Signal Receive Power (RSRP), and Reference Signal Strength Indicator (RSSI). And so on, it can also be other channel information, which is not limited here.

It should be noted that the process of transmitting information when different numbers of carriers are used by the first network node The transmit power may fluctuate. In the prior art, when the second network node calculates the transmit power by using the method of averaging multiple measurements of the transmit power, the channel measurement information does not meet the actual situation. For example, assume that the number of carriers used by the first network node in the four data transmissions is 1, 2, 3, 4 (power is 1, 1/2, 1/3, 1/4, respectively), and second The CSI obtained by measuring the carrier of the data transmission of the data transmission averages the average CSI, and the CSI value obtained by the UE after averaging the four transmission powers is inaccurate, causing the first network node to feed back according to the second network node. The MCS selected by CSI does not match the actual situation.

S1402: The second network node performs compensation calculation on the channel measurement information according to the target carrier number to obtain target channel measurement information.

The target channel measurement information refers to channel measurement information after the second network node corrects the channel measurement information. After the processor 1103 acquires the channel measurement information, the processor 1103 performs compensation calculation on the channel measurement information according to the number of target carriers received by the receiver 1101 to obtain target channel measurement information. The following channel measurement information takes CSI as an example to describe the calculation process in detail:

Optionally, in some embodiments of the present invention, when the channel measurement information is CSI and the target channel measurement information is the target CSI, the second network node performs compensation calculation on the channel measurement information according to the target carrier number to obtain the target channel measurement information. The method can be implemented as follows: the second network node determines the compensation power gain according to the target carrier number, and calculates the target CSI according to the CSI and the compensation power gain. For example, the processor 1103 increases the CSI of the four data transmissions by 0 dB, 3 dB, 4.8 dB, and 6 dB according to the number of

carriers

1, 2, 3, and 4 used for transmitting the information, and then averages the average value to obtain an average value. The CSI is transmitted by the eNB every time using one carrier. In this embodiment, after the first network node sends the number of carriers to the second network node, the second network node can feed back the accurate channel measurement information according to the number of carriers, which solves the problem that the carrier number is changed due to the use of the carrier information in the prior art. The fluctuation of the transmission power causes the second network node to inaccurate the channel measurement information obtained by the carrier measurement.

In a practical application, the second network node may further receive the transmit power corresponding to the first carrier concentration carrier sent by the first network node, and perform compensation calculation on the channel measurement information according to the target carrier number and the transmit power to obtain the target channel measurement information. Specifically, the second network node may obtain the transmit power in the current data transmission by dividing a fixed transmit power by the target carrier number, and perform compensation calculation on the channel measurement information according to the transmit power.

S1403: The second network node sends the target channel measurement information to the first network node.

S1306. The first network node 1000 receives the target channel measurement information sent by the second network node 1100, and selects a modulation and coding strategy according to the target channel measurement information.

Specifically, after the processor 1103 acquires the target channel measurement information, the transmitter 1102 sends the target channel measurement information, the receiver 1001 can receive the target measurement information, and the processor 1003 can determine the transmit power of the carrier used for transmitting the information according to the target measurement information. , select MCS according to the transmission power. For example, after the second network node feeds back the target CSI to the first network node, when the first network node needs to send information through two carriers, the CSI fed back by the second network node may be reduced by 3 dB to obtain a modified CSI, and then according to the modified CSI. Select MCS.

It should be noted that, in practical applications, the first network node 1000 may first determine the number of target carriers, and then select a carrier set whose number of carriers is not less than the target number of carriers to perform idle channel estimation.

It should be noted that, in the embodiment or the optional embodiment shown in FIG. 12 and FIG. 13 , the first network node may start from the initial time slot, and before the idle channel assessment is performed on the first carrier set, the first network node may The carrier in the first carrier set performs eCCA.

The following describes the process of jointly performing eCCA and VCCA on multiple carriers:

The first step: performing eCCA on each carrier separately;

For a single carrier, a counter is generated, whose initial value is N, the received energy on the carrier is detected in one time slot, and compared with the CCA-ED threshold. If the threshold is lower than the threshold, the channel is determined to be idle, and the counter is decremented by one; Otherwise, the counter is suspended and the carrier is eCCA in the next time slot.

It should be noted that when any carrier completes counting (that is, the counter takes a value of 0), the waiting time is entered, waiting for other carriers to complete counting, and when the carrier entering the waiting time is greater than or equal to the preset number of carriers of the first network node, Perform the second step;

Step 2: Perform VCCA on the carrier set;

Specifically, a virtual clear channel assessment (VCCA) refers to performing idle channel estimation on a carrier set in an evaluation slot. If all carriers in the carrier set are idle, determining that the carrier set is idle, if If one or more carriers are busy in the carrier set, it is determined that the carrier set is busy. For specific implementation, refer to the embodiment shown in FIG. 12 or an alternative embodiment. For example, if a certain subset of the plurality of carriers is determined to be idle in one time slot, and the number of carriers included in the subset of the carriers is greater than the preset number of carriers, the subset of the carriers is occupied for information transmission, otherwise the next The time slot performs VCCA on the plurality of carriers until an idle carrier subset is detected in one slot The number of carriers is greater than or equal to the preset number of carriers.

The preset carrier number is determined before the VCCA is executed, and the first network node may determine the preset carrier number by using multiple methods, as follows:

1. The first network node determines the preset carrier number semi-statically;

The first network node may set the number of the preset carriers to be a fixed value in a period of time, and the duration of the time period may be one day, two days, or one week, which is not limited herein.

2. The first network node determines the preset carrier number according to the eCCA and/or VCCA detection result.

For example, the first network node does not preempt the channel in a period of time, that is, the idle carrier subset that is greater than or equal to the preset number of carriers is not detected in the foregoing time period, and the first network node may lower the number of carriers. Improve channel preemption opportunities. The time period in the method may be 1 minute, 2 minutes or other values, and specific values are not limited herein.

For example, referring to FIG. 15, multiple carriers to be detected by the first network node are {CC1, CC2, CC3, CC4}, the total number of carriers is 4, the number of preset carriers is 3, and the first network node is in the second time. Before sending the information, the initial values of the counters of CC1, CC2, CC3, and CC4 are 4, 3, 2, and 4 respectively. After CC1 and CC2 respectively complete the counting, the waiting time is entered. When the 11th time slot CC3 is completed, CC4 is not completed. Counting, that is, the carrier subset {CC1, CC2, CC3} is idle, and the carrier subset including CC4 is busy; then, the first network node performs VCCA on {CC1, CC2, CC3}, and detects {CC1, CC2, CC3} is busy in the 12th to 14th time slots, idle in the 15th time slot, occupies {CC1, CC2, CC3} to transmit information, and CC4 completes counting in the 13th time slot, which can be from the 14th The first time slot starts to perform VCCA for {CC1, CC2, CC4}, {CC1, CC3, CC4}, {CC2, CC3, CC4}, respectively, since CC4 is busy in the 14th and 15th time slots, the first network node It is not possible to occupy the carrier subset transmission information including CC4.

In addition, in the process of performing VCCA on {CC1, CC2, CC3}, the first network node may perform eCCA on CC4, and if CC4 completes counting, the first network node may perform {CC1, CC2, CC3}, {CC1, CC2. , CC4}, {CC1, CC3, CC4}, {CC2, CC3, CC4} perform VCCA respectively. When it is detected that {CC1, CC2, CC4} is idle in one slot, it can occupy {CC1, CC2, CC4}. Send the message as shown in Figure 16.

In the process of performing VCCA, when the number of carriers included in the subset of carriers detected as idle is faster than the preset number of carriers, refer to FIG. 17, the first network node before the second transmission of information, at the 13th time The slot detects that CC1, CC2, CC3, and CC4 are idle, that is, {CC1, CC2, CC3}, {CC1, CC2, CC4}, {CC1, CC3, CC4}, {CC2, CC3, CC4} four carriers. The sets are all idle, and the first network node can select any one of the subsets of carriers to send information. It should be noted that, in actual applications, when the preset number of carriers is set by the first network node according to the detection result, the first network node may also occupy the information transmitted by {CC1, CC2, CC3, CC4}.

For the sake of understanding, the interaction between modules in the user equipment in the embodiment of the present invention is described in detail in a specific application scenario:

The first network node takes a base station as an example, and the number of available carriers of the base station is four, which are assumed to be CC1, CC2, CC3, and CC4 respectively; the preset number of carriers is three, and the first carrier set is {CC1, CC2, CC3} For example, the base station performs idle channel evaluation on CC1, CC2, and CC3, as follows:

Assume that the received energy detected by CC1, CC2, and CC3 in time slot 1 is -50dBm, -60dBm, -70dBm, and the preset received energy threshold is -60dBm, then it is determined that {CC1, CC2, CC3} is in time slot 1 The channel is busy, and {CC1, CC2, CC3} continues to be detected in time slot 2,

Assuming that the received energy detected by CC1, CC2, and CC3 in slot 2 is -62 dBm, -65 dBm, and -70 dBm, respectively, it is determined that {CC1, CC2, CC3} is the channel idle in slot 2, then the slave time At the beginning of slot 3, the above three carriers using CC1, CC2, and CC3 jointly transmit information.

In addition, the base station can also determine the idle sum of the detected received energy compared to the wideband CCA-ED threshold by setting the wideband CCA-ED threshold of the carrier set, and if it is lower than the wideband CCA-ED threshold, it is determined to be idle. The broadband CCA-ED threshold is determined to be busy. Referring to FIG. 18, the base station performs energy detection on CC1, CC2, CC3, and CC4, and compares the sum of the energy detected by CC1, CC2, and CC3 with the wideband CCA-ED threshold (60 MHz) corresponding to {CC1, CC2, and CC3}. If the sum of the obtained energies is higher than the 60MHz wideband CCA-ED threshold, it is determined that {CC1, CC2, CC3} is busy. {CC1, CC2, CC4}, {CC1, CC3, CC4} are similar to {CC1, CC2, CC3} and are busy.

The base station compares the sum of the energy detected by CC2, CC3, and CC4 with the wideband CCA-ED threshold (60 MHz) corresponding to {CC2, CC3, and CC4}, and the sum of the obtained energy is lower than the 60 MHz wideband CCA-ED threshold, and then the deterministic {CC2, CC3, CC4} is idle.

The second carrier set is exemplified by {CC1, CC2, and CC4}. The base station may also perform idle channel estimation on {CC1, CC2, and CC4} in time slot 1, and the specific process is similar to performing idle channel estimation on the first carrier set. Assume CC1 and CC2 are idle in slot 1 and CC3 is busy in slot 1 and CC4. When slot 1 is channel idle, it indicates that {CC1, CC2, CC3} is busy, {CC1, CC2, CC4} is channel idle, and the base station can start from slot 2, using CC1, CC2, and CC4. Send information jointly. Compared with performing single-slot idle channel estimation in the prior art, the probability of using the carrier to transmit information is improved, and the utilization of channel resources is improved.

When {CC1, CC2, CC3} is idle, the number of target carriers is 3, and the second network node takes mobile phone 1 as an example. The base station sends service information to mobile phone 1 through {CC1, CC2, CC3}, and the number of carriers is 3 Send to mobile phone 1, mobile phone 1 receives information 1, and performs channel measurement on {CC1, CC2, CC3}, taking CSI measurement as an example;

The CSI of the UE measurement {CC1, CC2, CC3} is 2dB, 0dB, 10dB respectively, then the mobile phone 1 determines the compensation gain according to the carrier number 3 to be 4.8dB, and the mobile phone 1 corrects the CSI to obtain 6.8dB, 4.8dB, 14.8dB, respectively. Calculate the CSI corresponding to the sample points in the CSI measurement window for CC1, CC2, and CC3, and then average the current measurement result and the previous result in the measurement window on each carrier, so that each sample point in the measurement window All of them correspond to single-carrier CSI. After receiving the CSI fed back by the UE, if the base station selects two carriers when transmitting the next message, the base station configures the MCS, reduces the CSI by 3dB to obtain the corrected CSI, and then selects the corrected CSI according to the modified CSI. The MCS solves the problem that the fluctuation of the transmission power in the prior art causes the CSI measurement to be inaccurate.

The method for evaluating the idle channel in the embodiment of the present invention is described above from a method perspective. The network node in the embodiment of the present invention is described from the perspective of the device:

Referring to FIG. 19, another embodiment of the first network node 1900 in the embodiment of the present invention includes:

The channel estimation module 1901 is configured to perform idle channel estimation on the first carrier set in the current time slot from an initial time slot, where the first carrier set includes at least one carrier;

When the first carrier set is idle in the current time slot, the sending module 1902 transmits information by using the first carrier set in the next time slot of the current time slot;

The channel evaluation module 1901 is further configured to: when the first carrier set is busy in the current time slot, perform idle channel estimation on the first carrier set in the next time slot of the current time slot until the current time slot is an end time slot.

Optionally, in some embodiments of the present invention, when the preset time period for the channel estimation module 1901 to perform the idle channel estimation on the first carrier set is the first time to the second time, the initial time is after the first time The end time slot is before the second time.

Optionally, in some embodiments of the present invention, the first carrier set includes multiple carriers, and the channel evaluation module 1901 is specifically configured to determine, according to the initial time slot, each carrier in the first carrier set receives energy in the current time slot. And if the sum is less than the first preset energy threshold, if the sum of the received energy of each carrier in the current time slot in the first carrier set is less than the first preset energy threshold, determining that the first carrier set is idle in the current time slot, if the first If the sum of the received energy of each carrier in the current slot is not less than the first preset energy threshold, it is determined that the first carrier set is busy in the current time slot.

Optionally, in some embodiments of the present invention, the first carrier set includes multiple carriers, and the channel evaluation module 1901 detects, according to the initial time slot, the received energy of each carrier in the first carrier set in the current time slot, and receives the received energy. The energy is compared with the second preset energy threshold. If the received energy is all lower than the second preset energy threshold, determining that the first carrier set is idle in the current time slot, and if the received energy is not all lower than the second energy threshold, determining The first carrier set is busy in the current time slot.

Optionally, in some embodiments of the present invention, the first carrier set includes multiple carriers, and the first network node 1900 further includes:

The first determining module 2001 is configured to determine, according to the sending module 1902, the target carrier number before transmitting the information by using the first carrier set in the next time slot of the current time slot;

The first determining module 2002 is configured to determine whether the number of carriers of the first carrier set in the current time slot is not less than the target carrier number, and if yes, the trigger sending module 1902 sends information by using the first carrier set in the next time slot of the current time slot. If not, the trigger channel evaluation module 1901 performs an idle channel assessment on the first carrier set in the next time slot of the current time slot.

Optionally, in some embodiments of the present invention, the first determining module 1903 is further configured to determine, according to the first carrier set, a target carrier set, where the number of carriers of the target carrier set is equal to the target carrier number;

The sending module 1902 is specifically configured to occupy all carriers in the target carrier set and send information in the next time slot of the current time slot.

Optionally, in some embodiments of the invention,

The sending module 1902 is further configured to: after the first determining module 2001 determines the target carrier number, send the target carrier number to the second network node, where the target carrier number is used by the second network node to correct the channel measurement information to obtain the target channel measurement information. ;

The first network node 1900 includes:

The receiving module 2003 is configured to receive target channel measurement information sent by the second network node.

The selection policy module 2004 is further configured to select a modulation and coding strategy according to the target channel measurement information.

Optionally, in some embodiments of the present invention, the method further includes:

The channel evaluation module 1901 is further configured to perform idle channel estimation on the second carrier set in the current time slot, where the second carrier set includes at least one carrier, and the second carrier set configures a part of carriers in the carrier for the first network node;

The sending module 1902 is further configured to: when the first carrier set is busy in the current time slot and the second carrier set is idle in the current time slot, use the second carrier set to send information in the next time slot of the current time slot.

Optionally, in some embodiments of the present invention, the second carrier set includes multiple carriers, and the first network node 1900 further includes:

The second determining module 2005 is configured to determine, by the sending module, the target carrier number before sending the information by using the second carrier set in the next time slot of the current time slot;

The second determining module 2006 is configured to determine whether the number of carriers of the second carrier set in the current time slot is not less than the number of target carriers, and if yes, triggering the sending module to use the second carrier set to send information in the next time slot of the current time slot. Step, if no, the trigger channel evaluation module performs idle channel estimation on the second carrier set in the next time slot of the current time slot.

Optionally, in some embodiments of the present invention, the second determining module 2005 is further configured to determine, according to the first carrier set, a target carrier set, where the number of carriers of the target carrier set is equal to the target carrier number;

In practical applications, the receiving module 2003 and the transmitting module 1902 can be implemented separately by a receiver and a transmitter, or can be implemented by a transceiver that integrates a receiving function and a transmitting function. The channel evaluation module 1901, the first determining module 2001, the first determining module 2002, the selecting policy module 2004, the second determining module 2005, and the second determining module 2006 may be implemented by a processor, between the modules in the first network node. For the interaction, refer to the method embodiment shown in FIG. 12 or FIG. 13 , and details are not described herein again.

The second network node 2100 in the embodiment of the present invention is described below. Another embodiment of the second network node in the embodiment of the present invention includes:

The receiving module 2101 is configured to receive, by the first network node, a number of target carriers, and information that is sent by the first network node by using a carrier;

The processing module 2102 is configured to measure the carrier to obtain channel measurement information.

The processing module 2102 is further configured to perform compensation calculation on the channel measurement information according to the target carrier number to obtain target channel measurement information.

The sending module 2103 is configured to send the target channel measurement information to the first network node.

Optionally, in some embodiments of the present invention, the processing module 2102 is specifically configured to: when the channel measurement information is CSI, and the target channel measurement information is the target CSI, determine the compensation power gain according to the target carrier number, according to the CSI and the compensation power gain. Calculate the target CSI.

In practical applications, the receiving module 2101 and the transmitting module 2103 may be implemented separately by a receiver and a transmitter, or may be implemented by a transceiver that integrates a receiving function and a transmitting function. The processing module 2102 can be implemented by a processor. For the interaction between the modules in the second network node, refer to the method embodiment shown in FIG. 13 , and details are not described herein again.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

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

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit is implemented in the form of a software functional unit and sold as a standalone product Or when used, it can be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the embodiments are modified, or the equivalents of the technical features are replaced by the equivalents of the technical solutions of the embodiments of the present invention.

Claims

A method for evaluating an idle channel, comprising:

The first network node performs an idle channel estimation on the first carrier set in the current time slot from an initial time slot, where the first carrier set includes at least one carrier;

And when the first carrier set is idle in the current time slot, sending information by using the first carrier set in a next time slot of the current time slot;

When the first carrier set is busy in the current time slot, performing idle channel estimation on the first carrier set in a next time slot of the current time slot until the current time slot is an end time slot. until.
The method according to claim 1, wherein when the first network node performs the idle channel estimation on the first carrier set for a preset time period from the first time to the second time, the initial time slot After the first time, the end time slot is before the second time.
The method according to claim 1, wherein the first carrier set comprises a plurality of carriers, and the first network node starts from an initial time slot, and performs idle channel estimation on the first carrier set in the current time slot. :

The first network node determines, from the initial time slot, whether the sum of received energy of the carriers in the first carrier set in the current time slot is less than the first preset energy threshold, if each carrier in the first carrier is concentrated If the sum of the received energy in the current time slot is less than the first preset energy threshold, determining that the first carrier set is idle in the current time slot, if each carrier in the first carrier set receives energy in the current time slot. If the sum is not less than the first preset energy threshold, it is determined that the first carrier set is busy in the current time slot.
The method according to claim 1, wherein the first carrier set comprises a plurality of carriers, and the first network node starts from an initial time slot, and performs idle channel estimation on the first carrier set in the current time slot. :

The first network node starts from an initial time slot, detects received energy of each carrier in the first carrier set in a current time slot, and compares the received energy with a second preset energy threshold, if the received energy is all If the second preset energy threshold is lower, determining that the first carrier set is idle in the current time slot, and if the received energy is not all lower than the second energy threshold, determining that the first carrier set is in the The current time slot is busy.
The method according to any one of claims 1 to 4, wherein the first load The wave set includes a plurality of carriers, and the first network node includes, before using the first carrier set to transmit information in a next time slot of the current time slot:

The first network node determines a target carrier number;

Determining, by the first network node, whether the number of carriers of the first carrier set in the current time slot is not less than the number of target carriers, and if yes, triggering the first time slot of the first network node in the current time slot And the step of transmitting information by using the first carrier set, if not, performing idle channel estimation on the first carrier set in a next time slot of the current time slot.
The method according to claim 5, wherein the transmitting, by the first network node, the information in the first time slot of the current time slot by using the first carrier set comprises:

Determining, by the first network node, a target carrier set from the first carrier set, where a number of carriers of the target carrier set is equal to the target carrier number;

The first network node occupies all carriers in the target carrier set and transmits information in a next time slot of the current time slot.
The method according to claim 6, wherein the determining, by the first network node, the number of target carriers comprises:

Transmitting, by the first network node, the target carrier number to a second network node, where the target carrier number is used by the second network node to correct channel measurement information to obtain target channel measurement information;

The first network node receives target channel measurement information sent by the second network node, and selects a modulation and coding strategy according to the target channel measurement information.
The method according to any one of claims 1 to 4, further comprising:

The first network node performs idle channel estimation on the second carrier set in the current time slot, the second carrier set includes at least one carrier, and the second carrier set is configured in the carrier of the first network node. Partial carrier

When the first carrier set is busy in the current time slot and the second carrier set is idle in the current time slot, the first network node utilizes the next time slot of the current time slot. The second carrier set transmits information.
The method according to claim 8, wherein said second set of carriers comprises a plurality of carriers, said first network node transmitting by said second set of carriers in a next time slot of said current time slot Information includes:

The first network node determines a target carrier number;

Determining, by the first network node, whether the number of carriers of the second carrier set in the current time slot is not less than the number of target carriers, and if yes, triggering the first time slot of the first network node in the current time slot The step of transmitting information by using the second carrier set, if not, performing idle channel estimation on the second carrier set in a next time slot of the current time slot.
The method according to claim 9, wherein the transmitting, by the first network node, the information in the second time slot of the current time slot by using the second carrier set comprises:

Determining, by the first network node, a target carrier set from the second carrier set, where a number of carriers of the target carrier set is equal to the target carrier number;

The first network node occupies all carriers in the target carrier set and transmits information in a next time slot of the current time slot.
A method for evaluating an idle channel, comprising:

Receiving, by the second network node, a number of target carriers sent by the first network node, and information sent by the first network node by using a carrier;

The second network node performs measurement on the carrier to obtain channel measurement information;

The second network node performs compensation calculation on the channel measurement information according to the target carrier number to obtain target channel measurement information;

The second network node sends the target channel measurement information to the first network node.
The method according to claim 11, wherein the channel measurement information is channel state information CSI, and the target channel measurement information is a target CSI;

The second network node performs compensation calculation on the channel measurement information according to the target carrier number to obtain the target channel measurement information, including:

The second network node determines a compensation power gain according to the number of target carriers;

The second network node calculates a target CSI according to the CSI and the compensated power gain.
A network node, wherein the network node is a first network node, and includes:

a channel estimation module, configured to perform idle channel estimation on the first carrier set in the current time slot from an initial time slot, where the first carrier set includes at least one carrier;

a sending module, configured to: when the first carrier set is idle in the current time slot, The next time slot of the pre-slot uses the first carrier set to transmit information;

The channel evaluation module is further configured to: when the first carrier set is busy in the current time slot, perform idle channel estimation on the first carrier set in a next time slot of the current time slot, until The current time slot is an end time slot.
The network node according to claim 13, wherein when the channel evaluation module performs the idle channel estimation on the first carrier set for a preset time period from a first time to a second time, the initial time slot is After the first time, the end time slot is before the second time.
The network node according to claim 13, wherein the first carrier set comprises a plurality of carriers, and the channel evaluation module is specifically configured to determine, according to an initial time slot, each carrier in the first carrier set is currently Whether the sum of the received energy in the time slot is smaller than the first preset energy threshold, and if the sum of the received energy of each carrier in the first time slot in the current time slot is less than the first preset energy threshold, determining the The first carrier set is idle in the current time slot. If the sum of the received energy of the carriers in the current time slot in the first time slot is not less than the first preset energy threshold, determining that the first carrier set is currently The time slot is busy.
The network node according to claim 13, wherein the first carrier set comprises a plurality of carriers, and the channel evaluation module detects, from an initial time slot, each carrier in the first carrier set in a current time slot. Receiving energy, comparing the received energy with a second preset energy threshold, and determining that the first carrier set is idle in the current time slot if the received energy is all lower than a second preset energy threshold. If the received energy is not all lower than the second energy threshold, determining that the first carrier set is busy in the current time slot.
The network node according to any one of claims 13 to 16, wherein the first carrier set comprises a plurality of carriers, and the network node further comprises:

a first determining module, configured to determine a target carrier number before the sending module sends information by using the first carrier set in a next time slot of the current time slot;

a first determining module, configured to determine whether the number of carriers of the first carrier set in the current time slot is not less than the target carrier number, and if yes, triggering, by the sending module, that the next time slot of the current time slot is utilized And the step of transmitting information by the first carrier set, if not, triggering the channel evaluation module to perform idle channel estimation on the first carrier set in a next time slot of the current time slot.
The network node of claim 17 wherein:

The first determining module is further configured to determine, according to the first carrier set, a target carrier set, where the number of carriers of the target carrier set is equal to the target carrier number;

The sending module is specifically configured to occupy all carriers in the target carrier set and send information in a next time slot of the current time slot.
A network node according to claim 18, wherein

The sending module is further configured to: after the first determining module determines the target carrier number, send the target carrier number to the second network node, where the target carrier number is used by the second network node to measure the channel The information is corrected to obtain target channel measurement information;

The network node further includes:

a receiving module, configured to receive target channel measurement information sent by the second network node;

And selecting a policy module, configured to select a modulation and coding strategy according to the target channel measurement information.
The network node according to any one of claims 13 to 16, wherein the channel evaluation module is further configured to perform idle channel estimation on the second carrier set in the current time slot, the second carrier The set includes at least one carrier, and the second carrier set configures a part of carriers in the carrier for the first network node;

The sending module is further configured to: when the first carrier set is busy in the current time slot, and the second carrier set is idle in the current time slot, in a next time slot of the current time slot The information is transmitted using the second set of carriers.
The network node according to claim 20, wherein the second carrier set comprises a plurality of carriers, and the network node further comprises:

a second determining module, configured to determine, by the sending module, the number of target carriers before using the second carrier set to send information in a next time slot of the current time slot;

a second determining module, configured to determine whether the number of carriers of the second carrier set in the current time slot is not less than the target carrier number, and if yes, triggering, by the sending module, to use in a next time slot of the current time slot And the step of transmitting information by the second carrier set, if not, triggering the channel evaluation module to perform idle channel estimation on the second carrier set in a next time slot of the current time slot.
A network node according to claim 21, wherein

The second determining module is further configured to determine, according to the first carrier set, a target carrier set, where the number of carriers of the target carrier set is equal to the target carrier number;

The sending module is specifically configured to occupy all carriers in the target carrier set and send information in a next time slot of the current time slot.
A network node, wherein the network node serves as a second network node, and includes:

a receiving module, configured to receive a number of target carriers sent by the first network node, and information that is sent by the first network node by using a carrier;

a processing module, configured to measure the carrier to obtain channel measurement information;

The processing module is further configured to perform compensation calculation on the channel measurement information according to the target carrier number to obtain target channel measurement information;

And a sending module, configured to send the target channel measurement information to the first network node.
The network node according to claim 23, wherein the processing module is specifically configured to: when the channel measurement information is channel state information CSI, and the target channel measurement information is a target CSI, determine compensation according to a target carrier number The power gain is calculated according to the CSI and the compensated power gain to obtain a target CSI.