WO2017028057A1

WO2017028057A1 - Channel assessment method based on license exempt spectrum and sending node

Info

Publication number: WO2017028057A1
Application number: PCT/CN2015/087094
Authority: WO
Inventors: 李�远; 李强; 马莎
Original assignee: 华为技术有限公司
Priority date: 2015-08-14
Filing date: 2015-08-14
Publication date: 2017-02-23
Also published as: CN107113865A

Abstract

Provided are a channel assessment method based on a license exempt spectrum and a sending node. The method comprises: a sending node making statistics on channel detection results of the sending node within a pre-set time period, determining the length of a contention window according to the channel detection results, and performing at least one clear channel assessment on a license exempt spectrum according to the length of the contention window. In the present invention, the length of a contention window is determined according to channel detection results within a pre-set time period, namely, being determined according to usage conditions of a channel; therefore, the determined length of the contention window can directly reflect a load of a current network, and thus it can be ensured that the determined length of the contention window is optimal, so as to perform clear channel assessment and data sending using the length of the contention window, thereby ensuring the fairness of channel occupancy.

Description

Channel evaluation method based on unlicensed spectrum and transmitting node

Technical field

The present invention relates to wireless communication technologies, and in particular, to a channel evaluation method and a transmitting node based on an unlicensed spectrum.

Background technique

The fourth-generation cellular mobile communication system represented by Long Term Evolution (LTE) and Long Term Evolution-Advanced (LTE-A) has the advantages of high-speed data transmission and seamless coverage. However, as users' demand for wireless data transmission continues to increase, current cellular networks are still facing various problems such as further improving the capacity of wireless cellular networks and the performance of edge users. Expanding bandwidth is the most direct and effective way to improve the capacity of cellular networks, and has become a research hotspot. In the method of extending the bandwidth, the method of data transmission by the unlicensed spectrum is cost-effective and has a large available bandwidth, which has great advantages. However, when using the unlicensed spectrum for data transmission, there may be multiple operators' Evolved NodeBs (eNBs) occupying the same unlicensed band at the same time, or working on the same unlicensed carrier simultaneously with radar and wireless fidelity (Wireless) Fidelity (Wi-Fi for short) is represented by other wireless communication systems such as 802.11. When these conditions occur, there is a problem that the coexistence nodes are seriously interfered with each other on the same unlicensed spectrum.

In order to solve the problem that the coexistence node generates interference on the unlicensed spectrum, the channel detection may be performed on the unlicensed spectrum by using the method of listening back and forth, that is, the Clear Channel Assessment (CCA), after the idle channel is successfully evaluated. Send data. The idle channel is evaluated by using the contention window length as a reference, and a preset random number is generated within a range corresponding to the contention window length. If the number of idle time slots is detected to satisfy the preset random number, the data is sent, otherwise Channel interception continues in the next time slot, thereby achieving fair coexistence between operators and system nodes in the unlicensed spectrum.

In the prior art, the Wi-Fi system adopts a dynamic competition window length adjustment method based on Acknowledge (ACK) feedback. Specifically, the contention window length of the transmitting node is initialized to p (for example, p=15), and the transmitting node Detecting feedback from the receiving node within a time window after each transmission is completed ACK information, if ACK is received, keep p unchanged; if ACK is not received, it is judged that the reception fails, and the sending node doubles the contention window length before the next transmission, that is, it is set to p=2*p+1 (p= 31); if the ACK is not received continuously, continue to double the competition window length until the competition window length reaches the maximum value of 1023, and if the ACK is received, the competition window length is reset to the initial value (p=15).

However, in the method for determining the contention window length in the prior art, the network load is determined according to whether an ACK message is received, but the tolerance of different systems to network interference is different, for example, the LTE system and the Wi-Fi system interfere with the network. Different tolerances, under the same network load, the receiving node of LTE can successfully detect the useful signal and feed back the ACK message, and the Wi-Fi system receiving node cannot successfully detect the useful signal without feeding back the ACK message, thus the LTE system and Wi The -Fi system determines the network load differently. Therefore, the current technology cannot be used to directly reflect the load of the current network, so that the optimal contention window length cannot be determined, and the fairness of channel occupation cannot be guaranteed.

Summary of the invention

The invention provides a channel evaluation method and a transmitting node based on the unlicensed spectrum, which can determine a better competition window length, thereby better ensuring channel occupation fairness.

A first aspect of the embodiments of the present invention provides a channel evaluation method based on an unlicensed spectrum, including:

The sending node counts the channel detection result of the sending node in the preset time period, and determines the contention window length according to the channel detection result;

Performing at least one idle channel evaluation on the unlicensed spectrum according to the contention window length.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the sending node collects a channel detection result of the sending node in a preset time period, and determines a contention window length according to the channel detection result, include:

Before the transmitting node performs the idle channel evaluation on the unlicensed spectrum, the channel detection result of the sending node in the preset time period is counted, and the contention window length is determined according to the channel detection result;

The end time of the preset time period is the start time of the idle channel evaluation.

With reference to the first aspect, in a second possible implementation manner of the first aspect, the sending node is configured to calculate a channel detection result of the sending node in a preset time period, and determine a contention window length according to the channel detection result, include:

The sending node calculates the channel detection node of the sending node in the preset time period according to the preset period. And determining a contention window length according to the channel detection result;

The end time of the preset time period is the end time of the preset period.

With reference to the first aspect, in a third possible implementation manner of the first aspect, the sending, by the sending node, the channel detection result of the sending node in a preset time period, includes:

The sending node counts the channel signal energy detected by the sending node in the preset time period, and determines the channel detecting result according to the channel signal energy;

The preset time period includes at least one unit time.

With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the sending node is configured to calculate a channel signal energy detected by the sending node in a preset time period, according to The channel signal energy determines channel detection results, including:

The sending node collects the channel signal energy detected by the sending node in each unit time for performing channel detection, and uses the unit time of the channel signal energy greater than the preset threshold as the busy unit time, and the channel signal energy is less than or equal to the pre- Set the unit time of the threshold as the idle unit time;

The ratio of the number of the busy unit time to the total number of unit time periods for performing channel detection included in the preset time period is used as the channel detection result.

With reference to the third possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, the sending node is configured to calculate a channel signal energy detected by the sending node in a preset time period, according to The channel signal energy determines channel detection results, including:

The transmitting node collects the channel signal energy detected by the transmitting node in each unit time for performing channel detection, and uses the sum of channel signal energy detected in each unit time for performing channel detection as the channel detection result. .

With reference to any one of the first to fifth possible implementation manners of the first aspect, in the sixth possible implementation manner of the first aspect, the determining, according to the channel detection result, the contention window length includes:

And determining a contention window length according to the mapping relationship between the channel detection result and the contention window length.

With reference to any one of the first to sixth possible implementation manners of the first aspect, in a seventh possible implementation manner of the first aspect, the method further includes: the sending node statistics the preset time The prior channel detection result of the transmitting node in at least one prior preset time period before the segment;

Correspondingly,

Determining the contention window length according to the channel detection result, including:

Determining the contention window length according to the channel detection result corresponding to the preset time period and the previous channel detection result corresponding to the at least one previous preset time period before the preset time period.

With reference to any one of the first to seventh possible implementation manners of the first aspect, in the eighth possible implementation manner of the first aspect, the sending node is configured to count the sending node in a preset time period The channel detection result, before determining the contention window length according to the channel detection result, further includes:

The transmitting node performs channel detection at all times within the preset time period.

With reference to any one of the first to seventh possible implementation manners of the first aspect, in the ninth possible implementation manner of the first aspect, the sending node is configured to count the sending node in a preset time period The channel detection result, before determining the contention window length according to the channel detection result, further includes:

The transmitting node performs channel detection during an idle channel evaluation time within the preset time period.

With reference to any one of the first to seventh possible implementation manners of the first aspect, in the tenth possible implementation manner of the first aspect, the sending node is configured to count the sending node in a preset time period The channel detection result, before determining the contention window length according to the channel detection result, further includes:

The transmitting node performs channel detection in a time period in which the data is not transmitted within the preset time period.

A second aspect of the present invention provides a sending node, including: a determining module, configured to collect a channel detection result of the sending node in a preset time period, and determine a contention window length according to the channel detecting result;

The evaluation module is configured to perform at least one idle channel evaluation on the unlicensed spectrum according to the contention window length.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the determining module is configured to: before each performing the idle channel evaluation on the unlicensed spectrum, calculate the preset time period Determining a channel detection result of the sending node, and determining a contention window length according to the channel detection result;

With reference to the second aspect, in a second possible implementation manner of the second aspect, the determining module is configured to: perform, according to a preset period, a channel detection result of the sending node in a preset time period, according to the The channel detection result determines the contention window length;

The ending time of the preset time period is an ending time of the preset period.

With reference to the second aspect, in a third possible implementation manner of the second aspect, the determining module The channel detection result used by the sending node in the preset time period is specifically: calculating a channel signal energy detected by the sending node in a preset time period, and determining a channel detecting result according to the channel signal energy;

The preset time period includes at least one unit time.

With reference to the third possible implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, the determining module is specifically configured to collect, by using a channel signal that is detected by the sending node in a preset time period. And determining, according to the energy of the channel signal, the channel detection result, specifically: counting the channel signal energy detected by the sending node in each unit time for performing channel detection, and the unit time of the channel signal energy being greater than a preset threshold As a busy unit time, the unit time with the channel signal energy less than or equal to the preset threshold is taken as the idle unit time; the number of the busy unit time and the total channel detection included in the preset time period are The ratio of the number of unit time is taken as the channel detection result.

With reference to the third possible implementation manner of the second aspect, in a fifth possible implementation manner of the second aspect, the determining module is specifically configured to collect, by using a channel signal that is detected by the sending node in a preset time period. And determining, according to the energy of the channel signal, the channel detection result, specifically: counting the channel signal energy detected by the sending node in each unit time for performing channel detection, and performing the channel detection in each unit time The sum of the detected channel signal energies is taken as the channel detection result.

With reference to any one of the first to fifth possible implementation manners of the second aspect, in a sixth possible implementation manner of the second aspect, the determining module is configured to determine a contention window according to the channel detection result The length is specifically determined according to the mapping relationship between the channel detection result and the contention window length, and the contention window length is determined.

With reference to any one of the first to sixth possible implementation manners of the second aspect, in the seventh possible implementation manner of the second aspect, the determining module is further configured to collect the preset time period The prior channel detection result of the transmitting node in at least one previous preset time period;

Correspondingly,

The determining module is configured to determine, according to the channel detection result, a contention window length, where: the channel detection result corresponding to the preset time period, and at least one prior pre-predetermined period The previous channel detection result corresponding to the time period is determined, and the contention window length is determined.

In combination with any one of the first to seventh possible embodiments of the second aspect, in the second aspect In an eighth possible implementation manner, the sending node further includes: a first detecting module;

The first detecting module is configured to perform channel detection at all times within the preset time period.

With reference to any one of the first to seventh possible implementation manners of the second aspect, in the ninth possible implementation manner of the second aspect, the sending node further includes: a second detecting module;

The second detecting module is configured to perform channel detection during an idle channel evaluation time in the preset time period.

With the first to seventh possible implementation manners of the second aspect, in the tenth possible implementation manner of the second aspect, the sending node further includes: a third detecting module;

The third detecting module is configured to perform channel detection during an idle channel evaluation time in the preset time period.

In the channel evaluation method based on the unlicensed spectrum provided by the present invention, the contention window length is determined according to the channel detection result in the preset time period, that is, according to the usage of the channel, and thus the determined competition window length can be intuitively reflected. The current network load can ensure that the determined contention window length is optimal, and then the contention window length is used for idle channel evaluation and data transmission, thereby ensuring the fairness of channel occupation.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

Figure 1 is a schematic diagram of a network architecture for licensed spectrum and unlicensed spectrum co-site deployment;

2 is a schematic flowchart of implementing the channel 1 based on the unlicensed spectrum according to the present invention;

3 is a schematic flowchart of implementing a second channel estimation method based on an unlicensed spectrum according to the present invention;

4 is a schematic structural diagram of Embodiment 1 of a sending node according to the present invention;

FIG. 5 is a schematic structural diagram of Embodiment 2 of a sending node according to the present invention;

FIG. 6 is a schematic structural diagram of Embodiment 3 of a sending node according to the present invention;

FIG. 7 is a schematic structural diagram of Embodiment 4 of a sending node according to the present invention;

FIG. 8 is a schematic structural diagram of Embodiment 5 of a transmitting node according to the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the 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.

The embodiment of the present invention can be applied to an LTE system working on an unlicensed spectrum, that is, a Licensed-Assisted Access using LTE (LAA-LTE) system. For the LAA-LTE system, the deployment scenarios can be classified into the following three types:

1. Licensed spectrum and unlicensed spectrum co-site deployment, ie licensed spectrum and unlicensed spectrum are aggregated by the same sending node. Figure 1 is a schematic diagram of a network architecture for licensed spectrum and unlicensed spectrum co-site deployment. As shown in Figure 1, the licensed spectrum and the unlicensed spectrum are deployed under the same transmitting node, and the transmitting node uses Carrier Aggregation (CA). Two spectrum aggregations.

2. The licensed spectrum and the unlicensed spectrum are deployed in non-co-located stations. For example, the licensed spectrum is deployed in the macro base station, and the license-free spectrum is deployed in low-power nodes such as micro cells and home base stations.

3. The license-free spectrum is deployed independently on the sending node, ie the transmitting node uses only the unlicensed spectrum and does not use the licensed spectrum.

The embodiments of the present invention can be applied to any of the foregoing deployment scenarios, and perform channel evaluation for the unlicensed spectrum.

FIG. 2 is a schematic flowchart of implementing a channel evaluation method based on an unlicensed spectrum according to the present invention. As shown in FIG. 2, the method includes:

S101. The sending node counts a channel detection result of the sending node in a preset time period, and determines a contention window length according to the channel detection result.

S102. Perform at least one idle channel evaluation on the unlicensed spectrum according to the competitive window length.

In this embodiment, the sending node may be a base station or a user equipment, which is not limited herein.

The idle channel evaluation is specifically: before sending the data by using the unlicensed spectrum, the sending node first determines whether the current channel is in an idle state, and if it is in an idle state, directly sends data; otherwise, generates a random integer according to the range corresponding to the contention window length. For example, if the competition window length is q, then A random integer N is generated in the range of 1 to q, and then continuous channel detection is performed with the granularity of the listening time slot. When an idle time slot is detected, N is decremented by 1; otherwise, N remains unchanged when N After subtracting to 0, the data is sent immediately. The idle time slot means that the corresponding channel is in an idle state, and when the energy detected on the channel is lower than a preset threshold, the channel is defined as an idle state. As can be seen from the above, the competition window length determines the average waiting time before data transmission.

In this embodiment, the contention window length is determined by the sending node according to the result of detecting the channel within the preset time period. Specifically, the sending node performs channel detection in a certain period of time in a preset time period, and collects channel detection results of the preset time period at the end time of the preset time period, and determines according to the channel detection result. The contention window is long, so that at least one of the subsequent idle channel evaluations detects the idle channel based on the determined competition window length, and then transmits the data.

Specifically, the preset time period is determined according to the preset end time and the preset time length. For example, the preset end time is the current time, and the preset time length is 5 seconds, and the preset time period is 5 seconds before the current time. The time between the current moments.

In this embodiment, the contention window length is determined according to the channel detection result in the preset time period, that is, according to the usage of the channel, so that the determined contention window length can intuitively reflect the load of the current network, thereby ensuring the determination. The competitive window length is optimal, and the contention window length is used for idle channel evaluation and data transmission, thereby ensuring the fairness of channel occupation.

In another embodiment, the foregoing step S101 specifically includes:

Each time the transmitting node performs the idle channel evaluation on the unlicensed spectrum, the channel detection result in the preset time period is counted, and the contention window length is determined according to the channel detection result.

That is to say, when starting the idle channel evaluation, the transmitting node first counts the channel detection result in the time period with the current time as the ending time, and determines the contention window length based on the result.

In this embodiment, the transmitting node calculates the channel detection result in the preset time period before performing the idle channel evaluation on the unlicensed spectrum, and determines the contention window length according to the channel detection result, so that the determined competition window length can be intuitive. Respond to the current network load, and the transmitting node counts the channel detection result in the latest period of time during the idle channel evaluation. Therefore, the competition window length determined according to the channel detection result is also the most accurate response to the network load. .

In another embodiment, the foregoing step S101 specifically includes:

The sending node calculates the channel detection result in the preset time period according to the preset period, according to the channel check. The test results determine the length of the competition window.

The ending time of the preset time period is the ending time of the preset period.

That is to say, the transmitting node counts the channel detection result according to a certain period, and when it is at the end time of the period, counts the channel detection result in the time period in which the time is the ending time, and determines the contention window length based on the result.

In this embodiment, by setting a reasonable period, the sending node counts the channel detection result according to the period. When the network load is light load, a period with a short duration can be set, and the sending node can be determined according to the latest network load. The most reasonable competition window length; when the network load is heavy, a period with a long duration can be set, which can ensure that the channel usage calculation is no longer performed for a long time, thereby saving system overhead.

In another embodiment, the contention window length determined by the above step S101 is a value range of the contention window length.

Specifically, the sending node counts the channel detection result in the preset time period, and determines the contention window length according to the channel detection result, where the contention window length is a value range, and when the value range is used for the idle channel evaluation, the first use is performed. The minimum value in the value range is used as the contention window length for idle channel evaluation. At the same time, certain rules are set. When the rule is satisfied, the idle channel evaluation is not performed and the data is directly sent. When the rule is not met, the competition within the value range is performed. The window length is doubled until the rules are met. For example, the rule may be: assuming that the current contention window is q, and generating a random number N greater than 1 and less than q, whether N unoccupied time slots are detected in q time slots, but not limited thereto. Set the rules according to the actual situation.

For example, when there are more idle time slots of the channel in the channel detection result in the preset time period, the network load is light load, and the value of the competition window length is determined to be [16,1024]. When using the value range for idle channel evaluation, first use the minimum value 16 as the contention window length for idle channel evaluation. When the preset rule is met, the data is directly sent. Otherwise, 32 is used as the competition window length to continue idle. Channel evaluation begins to send data until the preset rules are met. When the number of idle slots of the channel in the channel detection result in the preset time period calculated by the sending node is moderate, the network load is a moderate load, and the value of the contention window length is determined to be [128, 1024]. When using the value range for idle channel evaluation, first use the minimum value of 128 as the contention window length for idle channel evaluation. When the preset rule is met, the data is directly sent. Otherwise, the idle channel is continued with 256 as the contention window length. Evaluation, until the preset rules are met Send data. When the number of idle time slots of the channel in the channel result in the preset time period calculated by the sending node is small, the network load is overloaded, and the value of the contention window length is determined to be [512, 1024]. When the value range is used for idle channel evaluation, the minimum channel 512 is used as the contention window length for idle channel evaluation. When the preset rule is met, the data is directly sent. Otherwise, the idle channel is evaluated by using 1024 as the contention window length. The data is sent until the preset rules are met. It should be noted that if the current contention window length has reached the maximum value in the value range and the preset rule is not met, the minimum value range is used as the contention window length to continue the idle channel evaluation.

In another embodiment, the contention window length determined by the above step S101 is a value of the contention window length.

For example, when there are more idle time slots of the channel in the channel detection result in the preset time period calculated by the sending node, the network load is lightly loaded, and the value of the competition window length is determined to be 16, when the sending node counts. The number of idle slots of the channel in the channel detection result in the preset time period is moderate, indicating that the network load is a moderate load. At this time, the value of the competition window length is determined to be 128. When the sending node counts the preset time. If there are fewer idle time slots of the channel in the channel detection result in the segment, the network load is overloaded, and the value of the competition window length is determined to be 512.

After the value of the contention window is determined, the idle channel is evaluated and transmitted according to the value. For details, refer to the description of the idle channel evaluation in the first embodiment.

In another embodiment, in the foregoing step S101, the sending node counts the channel detection result of the sending node in the preset time period, which is specifically:

The preset time period includes at least one unit time.

Specifically, the preset time period is composed of at least one unit time, and the sending node determines the channel detection result of the preset time period according to the signal energy per unit time.

3 is a schematic flowchart of Embodiment 2 of a channel evaluation method based on an unlicensed spectrum according to the present invention. As shown in FIG. 3, the foregoing sending node counts channel signal energy detected by a transmitting node in a preset time period, according to channel signal energy. Determining the channel detection result specifically includes:

S201. The sending node collects, according to the channel signal energy detected by the sending node in each unit time for performing channel detection, and uses the unit time that the channel signal energy is greater than a preset threshold as a busy list. For the bit time, the unit time when the channel signal energy is less than or equal to the preset threshold is taken as the idle unit time.

It should be noted that the preset time period is composed of at least one unit time. During the entire preset time period, the channel signal energy detection is not necessarily performed in all unit time. Therefore, the sending node only counts the channel signal. The unit time of energy detection. In these unit time, the unit time in which the channel signal energy is greater than the preset threshold is taken as the busy unit time, and the unit time in which the channel signal energy is less than or equal to the preset threshold is taken as the idle unit time.

S202. Use a ratio of the number of busy unit time to the total number of unit time periods for performing channel detection included in the preset time period as the channel detection result.

It should be noted that the foregoing total unit time refers to all unit time for performing channel detection in a preset time period. When channel detection is performed during the entire preset time period, the total unit time is equal to the preset time period. All unit time. Otherwise, the above total unit time is not equal to all unit time within the preset time period.

In another embodiment, the sending node counts the channel signal energy detected by the sending node in the preset time period, and determines the channel detecting result according to the channel signal energy:

The transmitting node counts the channel signal energy detected by the transmitting node in each unit time for performing channel detection, and uses the sum of the channel signal energy detected in each unit time for performing channel detection as a channel detecting result.

In this embodiment, the sum of the channel signal energy detected in each unit time for channel detection is used as the channel detection result, that is, the value of the channel detection result is the sum of the energy.

In another embodiment, determining the contention window length according to the channel detection result in step S101 is specifically:

The contention window length is determined according to the mapping relationship between the channel detection result and the contention window length.

Specifically, the relationship between the channel detection result and the contention window length has a specific rule. When the number of busy unit time in the channel detection result is small, the network load is lightly loaded, and accordingly, the value of the competition window length is Smaller; when the number of busy unit time in the channel detection result is less than the number of idle unit time, the network load is moderate load, and accordingly, the value of the competition window length is moderate; when the channel detection result is If the number of busy unit time is large, the network load is overloaded, and accordingly, the value of the competition window length is larger.

Preferably, the ratio between the channel detection result and the contention window length can be obtained by simulation or actual measurement. More precise mapping. For example, when the channel detection result is a ratio of the number of busy unit time units to the total number of unit time periods for performing channel detection, the mapping relationship between the channel detection result and the contention window length can be obtained by simulation or actual measurement. Table 1 is a mapping table of channel detection results and contention window lengths based on simulation and actual measurements, as shown in Table 1:

Table 1

For example, if the channel detection result counted by the sending node is 0.4, that is, in the range of [0.3, 0.5], it can be determined that the value of the contention window length is 32.

Optionally, the contention window length determined according to the mapping relationship between the channel detection result and the contention window length may also be the value range of the contention window length. After determining the value range of the contention window length, the foregoing method may be adopted. The subsequent idle channel evaluation is performed using a certain value, which is not described here.

In another embodiment, based on the foregoing Embodiment 1, the channel detection result of the preset time period and the at least one previous preset time before the preset time period may also be used. The previous channel detection result of the segment determines the contention window length.

Specifically, the sending node collects the previous channel detection result of the sending node in the at least one previous preset time period before the preset time period, and the previous channel detection result is recorded by the sending node, and the statistics are After the channel detection result of the preset time period, the sending node detects, according to the channel detection result corresponding to the preset time period, and the previous channel detection corresponding to at least one previous preset time period before the preset time period As a result, the competition window length is determined.

Optionally, the sending node may determine the contention window length according to the channel detection result of the preset time period and the change trend of the previous channel detection result of the at least one previous preset time period. For example, when the channel detection result is a ratio of the number of busy unit time to the total number of unit time periods for performing channel detection, it is assumed that the number of busy unit time detected during the preset time period and the total number of channel detections performed. The ratio of the number of unit time is ρ _n , and the ratio of the number of busy unit time detected in the previous preset time period of the preset time period to the total unit time of channel detection is ρ _n-1 The competition window length may determine the contention window length based on the relative relationship of ρ _n-1 and ρ _n and the current value of the competition window length. For example, when (ρ _n -ρ _n-1 )/ρ _{n is} greater than a predetermined threshold, the current value of the contention window length is doubled as the competition window length when (ρ _n -ρ _n-1 )/ρ _{n is} less than one When the threshold is preset, the current value of the contention window length is halved as the competition window length, otherwise the competition window length is kept unchanged.

In this embodiment, in addition to the channel detection result in the preset preset time period, the content of the competition window is determined according to the channel detection result of the at least one previous preset time period before the preset time period. That is to say, the transmitting node not only considers the current network load, but also considers the historical data of the network load, and based on the current network load and historical data, derives the trend of the network load, thereby determining the contention window according to the change trend. Long, considering the current load of the network and historical data, the determined contention window length can be applied to the current and subsequent idle channel evaluation, thereby ensuring the fairness of channel occupation.

In another embodiment, before the step S101, the sending node performs channel detection at all times within the preset time period.

Specifically, the transmitting node performs channel detection at all times within a preset time period, and the transmitting node performs channel detection regardless of whether the transmitting node transmits data during the time.

Since the detection method performs channel detection throughout the preset time period, the obtained channel detection result is the most accurate, and the reflected network load condition is also the most accurate.

In another embodiment, before the step S101, the sending node performs channel detection in the idle channel evaluation time within the preset time period.

Specifically, the transmitting node does not perform channel detection at all times within a preset time period, but multiplexes the result of the idle channel evaluation, that is, performs channel detection only during idle channel evaluation, and does not perform channel detection for the rest of the time. When the network load is heavy, this detection method can save the system overhead to the greatest extent, so that the network load is no longer increased.

In another embodiment, before the step S101, the sending node performs channel detection in a time period in which the data is not transmitted within the preset time period.

It should be noted that, as long as the transmitting node does not send data for channel detection, the time when the data is not transmitted may include the idle channel evaluation time.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to the program instructions. The foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing method includes the steps of the foregoing method embodiments; and the foregoing storage medium includes: a ROM, a RAM, a magnetic disk, or an optical disk, and the like, which can store various program codes. quality.

FIG. 4 is a schematic structural diagram of Embodiment 1 of a sending node according to the present invention. As shown in FIG. 4, the sending node includes:

The determining module 401 is configured to calculate a channel detection result of the sending node in a preset time period, and determine a contention window length according to the channel detection result.

The evaluation module 402 is configured to perform at least one idle channel evaluation on the unlicensed spectrum according to the contention window length.

The sending node may be a base station or a user equipment, which is not limited herein.

The sending node is used to perform the foregoing method embodiments, and the implementation principle and technical effects are similar, and details are not described herein again.

In another embodiment, the determining module 401 is configured to: before each performing the idle channel evaluation on the unlicensed spectrum, the channel detection result of the sending node in a preset time period, according to the channel detection result. Determine the competition window length.

In another embodiment, the determining module 401 is configured to: according to a preset period, count channel detection results of the sending node in a preset time period, and determine a contention window length according to the channel detection result.

In another embodiment, the determining module 401 is configured to collect the channel detection result of the sending node in the preset time period, specifically: the channel signal energy detected by the sending node in the preset preset time period, according to the The channel signal energy determines the channel detection result.

The preset time period includes at least one unit time.

In another embodiment, the determining module 401 is specifically configured to calculate the channel signal energy detected by the sending node in the preset time period, and determine the channel detecting result according to the channel signal energy, specifically: The channel signal energy detected in each unit time of the channel detection is performed, and the unit time of the channel signal energy greater than the preset threshold is used as the busy unit time, and the unit time with the channel signal energy less than or equal to the preset threshold is regarded as idle. a unit time; a ratio of the number of the busy unit time to the total number of unit time periods for performing channel detection included in the preset time period is used as the channel detection result.

In another embodiment, the determining module 40 is specifically configured to count the sending section in a preset time period. Point-detecting the channel signal energy, and determining the channel detection result according to the channel signal energy, specifically: counting the channel signal energy detected by the sending node in each unit time for performing channel detection, and performing channel detection The sum of the channel signal energies detected in each of the unit time is used as the channel detection result.

In another embodiment, the determining module 401 is configured to determine a contention window length according to the channel detection result, specifically, determining a contention window length according to a mapping relationship between the channel detection result and a contention window length.

In another implementation manner, the determining module 401 is further configured to collect, according to the previous channel detection result of the sending node in the at least one previous preset time period before the preset time period.

Correspondingly, the determining module 401 is configured to determine, according to the channel detection result, a contention window length, specifically: the channel detection result corresponding to the preset time period, and at least one prior to the preset time period. Determining the contention window length according to a previous channel detection result corresponding to the preset time period.

FIG. 5 is a schematic structural diagram of Embodiment 2 of a sending node according to the present invention. As shown in FIG. 5, the sending node further includes a first detecting module 403, configured to perform channel detecting at all times in the preset time period.

FIG. 6 is a schematic structural diagram of a third embodiment of a sending node according to the present invention. As shown in FIG. 6, the sending node further includes a second detecting module 404, configured to perform the idle channel evaluation time in the preset time period. Channel detection.

FIG. 7 is a schematic structural diagram of Embodiment 4 of a sending node according to the present invention. As shown in FIG. 7, the sending node further includes a third detecting module 405, configured to perform time in the preset time period without transmitting data. Channel detection.

FIG. 8 is a schematic structural diagram of Embodiment 5 of a sending node according to the present invention. As shown in FIG. 8, the sending node includes: a memory 501 and a processor 502.

The memory is configured to store program instructions, and the processor is configured to invoke program instructions in the memory to perform the following methods:

And calculating a channel detection result of the sending node in a preset time period, and determining a contention window length according to the channel detection result.

Further, the processor is configured to perform the idle channel evaluation on the unlicensed spectrum each time. Before, the channel detection result of the sending node in the preset time period is counted, and the contention window length is determined according to the channel detection result.

Further, the processor is configured to calculate, according to a preset period, a channel detection result of the sending node in a preset time period, and determine a contention window length according to the channel detection result.

Further, the processor is configured to calculate channel signal energy detected by the sending node in a preset time period, and determine a channel detection result according to the channel signal energy.

The preset time period includes at least one unit time.

Further, the processor is configured to collect channel signal energy detected by the sending node in each unit time for performing channel detection, and use a unit time with a channel signal energy greater than a preset threshold as a busy unit time, and set the channel The unit time when the signal energy is less than or equal to the preset threshold is used as the idle unit time; the ratio of the number of the busy unit time to the total unit time of the channel detection included in the preset time period is taken as The channel detection result.

Further, the processor is configured to collect, according to the channel signal energy detected by each sending unit in the unit time for performing channel detection, and sum the channel signal energy detected in each unit time for performing channel detection. As the channel detection result.

Further, the processor is configured to determine a contention window length according to the mapping relationship between the channel detection result and the contention window length.

Further, the processor is configured to collect, according to the previous channel detection result of the sending node in the at least one previous preset time period before the preset time period.

Correspondingly, the processor is configured to determine, according to the channel detection result corresponding to the preset time period, and the previous channel detection result corresponding to the at least one previous preset time period before the preset time period, The competition window is long.

Further, the processor is configured to perform channel detection at all times within the preset time period.

Further, the processor is configured to perform channel detection during an idle channel evaluation time within the preset time period.

Further, the processor is configured to perform channel detection in a time period in which the data is not transmitted within the preset time period.

Finally, it should be noted that the above embodiments are merely illustrative of 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 foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

A channel evaluation method based on an unlicensed spectrum, characterized in that it comprises:

The sending node counts the channel detection result of the sending node in the preset time period, and determines the contention window length according to the channel detection result;

Performing at least one idle channel evaluation on the unlicensed spectrum according to the contention window length.
The method according to claim 1, wherein the sending node counts a channel detection result of the sending node in a preset time period, and determines a contention window length according to the channel detecting result, including:

Before the transmitting node performs the idle channel evaluation on the unlicensed spectrum, the channel detection result of the sending node in the preset time period is counted, and the contention window length is determined according to the channel detection result;

The end time of the preset time period is the start time of the idle channel evaluation.
The method according to claim 1, wherein the sending node counts a channel detection result of the sending node in a preset time period, and determines a contention window length according to the channel detecting result, including:

The sending node calculates the channel detection result of the sending node in the preset time period according to the preset period, and determines the contention window length according to the channel detection result;

The end time of the preset time period is the end time of the preset period.
The method according to claim 1, wherein the sending node counts channel detection results of the sending node in a preset time period, including:

The sending node counts the channel signal energy detected by the sending node in the preset time period, and determines the channel detecting result according to the channel signal energy;

The preset time period includes at least one unit time.
The method according to claim 4, wherein the sending node counts the channel signal energy detected by the sending node in a preset time period, and determines the channel detecting result according to the channel signal energy, including:

The sending node collects the channel signal energy detected by the sending node in each unit time for performing channel detection, and uses the unit time of the channel signal energy greater than the preset threshold as the busy unit time, and the channel signal energy is less than or equal to the pre- Set the unit time of the threshold as the idle unit time;

The ratio of the number of the busy unit time to the total number of unit time periods for performing channel detection included in the preset time period is used as the channel detection result.
The method according to claim 4, wherein the sending node counts the channel signal energy detected by the sending node in a preset time period, and determines the channel detecting result according to the channel signal energy, including:

The transmitting node collects the channel signal energy detected by the transmitting node in each unit time for performing channel detection, and uses the sum of channel signal energy detected in each unit time for performing channel detection as the channel detection result. .
The method according to any one of claims 1-6, wherein the determining the contention window length according to the channel detection result comprises:

And determining a contention window length according to the mapping relationship between the channel detection result and the contention window length.
The method according to any one of claims 1 to 7, wherein the method further comprises: the sending node counting the sending in the at least one prior preset time period before the preset time period The previous channel detection result of the node;

Correspondingly,

Determining, by the sending node, the contention window length according to the channel detection result, including:

Determining, by the sending node, the contention window length according to the channel detection result corresponding to the preset time period and the previous channel detection result corresponding to at least one previous preset time period before the preset time period .
The method according to any one of claims 1-8, wherein the transmitting node counts a channel detection result of the sending node within a preset time period, and determines a contention window length according to the channel detection result. ,Also includes:

The transmitting node performs channel detection at all times within the preset time period.
The method according to any one of claims 1-8, wherein the transmitting node counts a channel detection result of the sending node within a preset time period, and determines a contention window length according to the channel detection result. ,Also includes:

The transmitting node performs channel detection during an idle channel evaluation time within the preset time period.
The method according to any one of claims 1-8, wherein the transmitting node counts a channel detection result of the sending node within a preset time period, and determines a contention window length according to the channel detection result. ,Also includes:

The sending node performs channel check in a time period in which the data is not sent within the preset time period. Measurement.
A sending node, comprising:

a determining module, configured to collect a channel detection result of the sending node in a preset time period, and determine a contention window length according to the channel detection result;

The evaluation module is configured to perform at least one idle channel evaluation on the unlicensed spectrum according to the contention window length.
The transmitting node according to claim 12, wherein the determining module is configured to: before each performing the idle channel evaluation on the unlicensed spectrum, calculate a channel of the sending node in a preset time period. a detection result, determining a competition window length according to the channel detection result;

The end time of the preset time period is the start time of the idle channel evaluation.
The transmitting node according to claim 12, wherein the determining module is configured to: according to a preset period, count channel detection results of the sending node in a preset time period, and determine according to the channel detection result Competitive window length;

The ending time of the preset time period is an ending time of the preset period.
The transmitting node according to claim 12, wherein the determining module is configured to count channel detection results of the sending node in a preset time period, specifically: the sending node in a statistical preset time period Detecting channel signal energy, determining a channel detection result according to the channel signal energy;

The preset time period includes at least one unit time.
The transmitting node according to claim 15, wherein the determining module is configured to calculate a channel signal energy detected by the sending node in a preset time period, and determine a channel detecting result according to the channel signal energy, Specifically, the channel signal energy detected by the sending node in each unit time for performing channel detection is calculated, and the unit time of the channel signal energy greater than a preset threshold is used as a busy unit time, and the channel signal energy is less than or equal to The unit time of the preset threshold is used as the idle unit time; the ratio of the number of the busy unit time to the total number of unit time channels for channel detection included in the preset time period is used as the channel detection result.
The transmitting node according to claim 15, wherein the determining module is configured to calculate a channel signal energy detected by the sending node in a preset time period, and determine a channel detecting result according to the channel signal energy, Specifically, the channel signal energy detected by the sending node in each unit time for performing channel detection is calculated, and each unit of the channel detection is performed. The sum of the channel signal energies detected in time is taken as the channel detection result.
The transmitting node according to any one of claims 12-17, wherein the determining module is configured to determine a contention window length according to the channel detection result, specifically: according to the channel detection result and a contention window length The mapping relationship determines the length of the competition window.
The sending node according to any one of claims 12 to 18, wherein the determining module is further configured to collect the sending node in the at least one previous preset time period before the preset time period. Prior channel detection result;

Correspondingly,

The determining module is configured to determine, according to the channel detection result, a contention window length, where: the channel detection result corresponding to the preset time period, and at least one prior pre-predetermined period The previous channel detection result corresponding to the time period is determined, and the contention window length is determined.
The transmitting node according to any one of claims 12 to 19, further comprising: a first detecting module;

The first detecting module is configured to perform channel detection at all times within the preset time period.
The transmitting node according to any one of claims 12 to 19, further comprising: a second detecting module;

The second detecting module is configured to perform channel detection during an idle channel evaluation time in the preset time period.
The transmitting node according to any one of claims 12 to 19, further comprising: a third detecting module;

The third detecting module is configured to perform channel detection in a time period in which the data is not sent within the preset time period.