KR20200083116A - Method and apparatus for spatial reuse transmission - Google Patents

Abstract

The present invention relates to a space reuse transmission method and an apparatus thereof. According to the present invention, the space reuse transmission method may comprise the steps of: determining, by a transmitter, frequency efficiency (spatial reuse transmission) and frequency efficiency (non-spatial reuse transmission); and determining, by the transmitter, whether to transmit space reuse based on the frequency efficiency (spatial reuse transmission) and the frequency efficiency (non-spatial reuse transmission). The frequency efficiency (spatial reuse transmission) may be a predicted value for frequency efficiency during spatial reuse transmission, and the frequency efficiency (non-spatial reuse transmission) may be a predicted value for frequency efficiency during non-spatial reuse transmission. According to the present invention, radio resource utilization efficiency can be increased.

Description

Method and apparatus for spatial reuse transmission}

The present invention relates to a space reuse method and apparatus. More specifically, it relates to a method, apparatus and recording medium for performing spatial reuse transmission by predicting performance for reuse of spatial resources.

As the demand for radio resources increases, many telecommunication companies and communication related organizations are trying to find a way to satisfy the demand for radio resources. The international telecommunication union-radio sector (ITU-R) aims at a future mobile radio technology that provides a peak data rate of 20 gb/s (giga bits for second).

Various methods can be used as a method for increasing the peak data rate. For example, a modulation and coding scheme (MCS) having a relatively high number (or index) may be used to increase the peak data rate, a large number of antennas may be used, or a wider frequency domain may be utilized.

To improve a peak data rate in the cellular network in the 3GPP (3 ^rd generation partnership project) it completed the standardization of the channel access technique called LAA (licensed assisted access). LAA is a new technology introduced in long term evolution (LTE) release 13. LAA defines an access method for utilizing an unlicensed band of 5 GHz to support downlink transmission of LTE and LTE-A (advanced) based cellular network systems.

In an existing LTE-based cellular network, the transmitter may select a modulation and coding scheme (MCS) for the next downlink transmission based on channel quality indicator (CQI) index information fed back from the receiver.

However, when the LTE mobile communication system operates in the unlicensed band, there is a risk that the downlink transmission of the transmitter collides with the signal of the unlicensed band LTE base station of an existing Wi-Fi device or another mobile operator. At this time, if the receiver receives a significant intensity interference, the receiver judges that the current channel quality is bad and informs the transmitter of a low CQI compared to when there is no collision, and the transmitter performs a downlink transmission by selecting a low transmission rate based on the received low CQI. do. It is preferable to select a lower transmission rate when a downlink transmission transmitted using a lower transmission rate collides with a simultaneous transmission signal in the future. However, if it does not collide, the yield is lowered due to the decrease in spectral efficiency and unnecessary radio resources are wasted.

In addition, it is advantageous to transmit and receive data if data can be transmitted or received while avoiding interference even if interference exists for efficient use of radio resources. Therefore, for efficient use of radio resources, it is necessary to accurately determine whether spatial resources are reused, and if spatial reuse is possible, research on a method for transmitting data is required.

The present invention aims to solve all the above-mentioned problems.

In addition, the present invention aims to increase the efficiency of radio resource utilization by determining whether to use the space reuse transmission in consideration of the space reuse transmission efficiency based on the channel quality information received from the receiver.

In addition, the present invention aims to improve the reuse rate and yield for spatial resources and lower the network congestion based on the determination as to whether or not to transmit space reuse.

The representative configuration of the present invention for achieving the above object is as follows.

According to an aspect of the present invention, a space reuse transmission method includes a step in which a transmitter determines frequency efficiency (spatial reuse transmission) and frequency efficiency (non-spatial reuse transmission) and the transmitter performs the frequency efficiency (spatial reuse transmission) and the And determining whether spatial reuse is transmitted based on frequency efficiency (non-spatial reuse transmission), wherein the frequency efficiency (spatial reuse transmission) is a predicted value for frequency efficiency in spatial reuse transmission, and the frequency efficiency (non- Spatial reuse transmission) may be a predicted value for frequency efficiency in non-spatial reuse transmission.

Meanwhile, the transmitter may further include transmitting data based on spatial reuse transmission, wherein the spatial reuse transmission may adjust transmission strength according to the external interference in consideration of the strength of external interference.

In addition, the frequency efficiency (spatial reuse transmission) may be determined based on frequency efficiency for each channel state information, data modulation, and probability of successful transmission for each coding.

In addition, the frequency efficiency (non-spatial reuse transmission) may be determined based on frequency efficiency for each channel state information, probability of successful transmission by data modulation and coding, and transmission time efficiency.

According to another aspect of the present invention, a transmitter performing spatial reuse transmission includes a communication unit implemented for data transmission and a processor operatively connected to the communication unit, wherein the processor includes frequency efficiency (spatial reuse transmission) and It may be implemented to determine frequency efficiency (non-spatial reuse transmission), and determine whether space reuse transmission is based on the frequency efficiency (spatial reuse transmission) and the frequency efficiency (non-spatial reuse transmission), the frequency efficiency (Spatial reuse transmission) may be a predicted value for frequency efficiency in space reuse transmission, and the frequency efficiency (non-space reuse transmission) may be a prediction value for frequency efficiency in non-space reuse transmission.

Meanwhile, the processor is implemented to transmit data based on spatial reuse transmission, and the spatial reuse transmission may adjust transmission strength according to the external interference in consideration of the strength of external interference.

Further, the frequency efficiency (spatial reuse transmission) may be determined based on frequency efficiency for each channel state information, data modulation, and probability of successful transmission for each coding.

In addition, the frequency efficiency (non-spatial reuse transmission) may be determined based on frequency efficiency for each channel state information, probability of successful transmission by data modulation and coding, and transmission time efficiency.

According to the present invention, radio resource utilization efficiency can be increased by determining whether to use the space reuse transmission in consideration of the space reuse transmission efficiency based on the channel quality information received from the receiver.

In addition, according to the present invention, since the performance of the space reuse transmission is predicted and the space reuse transmission is determined based on the value, the space reuse transmission is not performed in an environment where the space reuse transmission causes performance degradation. Therefore, the reuse and yield of spatial resources can be improved and network congestion can be lowered.

1 is a conceptual diagram showing a wireless communication system.
2 is a conceptual diagram illustrating a spatial reuse transmission method according to an embodiment of the present invention.
3 is a conceptual diagram illustrating a determination for spatial reuse transmission according to an embodiment of the present invention.
4 is a conceptual diagram illustrating CQI distribution for clustering according to an embodiment of the present invention.
5 is a conceptual diagram illustrating a method for determining transmission time efficiency according to an embodiment of the present invention.
6 is a conceptual diagram showing the performance of a method for determining spatial reuse transmission according to an embodiment of the present invention.
7 is a block diagram illustrating a wireless device according to an embodiment of the present invention.

For a detailed description of the present invention, which will be described later, reference is made to the accompanying drawings that illustrate, by way of example, specific embodiments in which the present invention may be practiced. These embodiments are described in detail enough to enable those skilled in the art to practice the present invention. It should be understood that the various embodiments of the invention are different, but need not be mutually exclusive. For example, specific shapes, structures, and characteristics described in this specification may be implemented by changing from one embodiment to another without departing from the spirit and scope of the present invention. In addition, it should be understood that the position or arrangement of individual components within each embodiment may be changed without departing from the spirit and scope of the present invention. Therefore, the following detailed description is not intended to be done in a limiting sense, and the scope of the present invention should be taken to cover the scope claimed by the claims of the claims and all equivalents thereto. In the drawings, similar reference numerals denote the same or similar components throughout several aspects.

Hereinafter, various preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to enable those skilled in the art to easily implement the present invention.

In the spatial reuse transmission method and apparatus according to an embodiment of the present invention, performance when spatial reuse transmission is predicted by adjusting transmission signal strength and energy detection threshold in an unlicensed band Disclosed is a method for determining whether space reuse is transmitted.

Spatial reuse transmission is a transmission method that reuses spatial resources among radio resources and transmits data when interference and interference are available, and data transmission and reception is possible despite interference.

The performance of spatial reuse transmission can vary greatly depending on the location of the transmitter, receiver, and interferer. When the receiver is close to the interference source, the damage due to the additional interference may be greater than the transmission time gain obtained through spatial reuse transmission. Therefore, there is a need for a method for properly performing spatial reuse transmission after predicting the performance of the spatial reuse transmission.

In the space reuse transmission method according to an embodiment of the present invention, the performance of the space reuse transmission can be predicted using the distribution of channel quality information received from the receiver and the average access latency, and whether space reuse transmission is determined based on the predicted performance. .

1 is a conceptual diagram showing a wireless communication system.

Referring to FIG. 1, the wireless communication system 100 may include at least one transmitter (eg, a base station) 110. The transmitter 110 provides communication services for a specific geographic area (eg, a cell). The cell can be further divided into a number of regions (called sectors). The receiver (eg, the terminal) 120 may be fixed or mobile. Transmitter 10 may generally be a fixed station in communication with receiver 110.

A downlink (DL) may mean communication from a transmitter to a receiver, and an uplink (UL) may mean communication from a receiver to a transmitter.

The purpose of a wireless communication system is to enable multiple users to perform reliable communication regardless of location and mobility. However, a wireless channel is a path loss, noise, fading due to multipath, intersymbol interference (ISI), or Doppler due to mobility of a terminal. It has non-ideal properties such as the Doppler effect. Accordingly, various technologies have been developed to overcome the non-ideal characteristics of the wireless channel and to increase the reliability of wireless communication.

The wireless communication system may use a channel quality indicator (CQI) to increase the reliability of wireless communication. CQI is information about a channel state between a transmitter and a receiver. The transmitter determines the Modulation and Coding Scheme (MCS) used for transmission using the CQI received from the receiver. If it is determined that the channel condition is good using the CQI, the transmitter may increase the modulation order or increase the transmission rate by increasing the coding rate. If it is determined that the channel state is not good using the CQI, the transmitter may lower the transmission rate by lowering the modulation order or lowering the coding rate. When the transmission rate is lowered, the reception error rate can be lowered.

Specifically, in a current LTE (long term evolution) mobile communication system, link adaptation for finding an optimal transmission rate when a transmitter transmits a downlink to a receiver may be performed through the following process.

The transmitter transmits a cell-specific reference signal (CRS) in all resource blocks (RBs) so that the receiver can measure the channel quality. After the receiver measures the channel quality using the CRS sent by the transmitter, it predicts and transmits the success rate when transmitting at the modulation and coding rate corresponding to various channel quality indicator (CQI) indexes. The highest CQI index with a transport block error probability not exceeding 10% can be indicated to the transmitter.

The transmitter may select a modulation and coding scheme (MCS) for the next downlink transmission based on the CQI index information fed back from the receiver.

However, when the LTE mobile communication system operates in the unlicensed band, there is a risk that the downlink transmission of the transmitter collides with the signal of the unlicensed band LTE base station of an existing Wi-Fi device or another mobile operator. At this time, if the receiver receives a significant intensity interference, the receiver judges that the current channel quality is bad and informs the transmitter of a low CQI compared to when there is no collision, and the transmitter performs a downlink transmission by selecting a low transmission rate based on the received low CQI. do.

Hereinafter, for convenience of description, the channel state information is expressed as CQI, and the modulation and/or coding method of data is expressed as MCS, but CQI can be broadly interpreted as channel state information, and MCS modulates and/or data. It can be interpreted as a coding method.

In addition, in the embodiments of the present invention, for convenience of explanation, only the unlicensed band is disclosed, but the collision recognition link adaptation method using unsupervised clustering according to the embodiment of the present invention may be used in the licensed band as well as the unlicensed band.

In addition, in the clustering method, not only unsupervised clustering, but also other clustering methods may be used, and such an embodiment is also included in the scope of the present invention.

2 is a conceptual diagram illustrating a spatial reuse transmission method according to an embodiment of the present invention.

2, a space reuse transmission method according to a transmission power of a transmitter is disclosed.

Referring to FIG. 2, the transmitter may adjust the energy detection threshold 220 according to the transmission power 200 and transmit space reuse according to the adjustment of the energy detection threshold 220 This can be done.

For example, the transmitter may transmit data to the receiver using the transmission power 200. When the transmission power 200 is used, the energy detection threshold 220 may be determined. The transmitter may perform spatial reuse transmission only when the intensity of the interference signal detected by the transmitter is equal to or less than the energy detection threshold value 220.

As the transmission power 200 becomes relatively large, the energy detection threshold becomes relatively small, and the opportunity for spatial reuse transmission may be relatively small. Conversely, as the transmission power 200 is relatively small, the energy detection threshold 220 is relatively large, and the opportunity for spatial reuse transmission is relatively large.

In other words, the transmitter may reduce the transmission power 200 in consideration of the size of the external interference signal in order to use the spatial reuse transmission method. The energy detection threshold 220 becomes relatively large by the reduced transmission power, and the size of the energy level judged to be interference is relatively large, so that the opportunity for spatial reuse transmission can be relatively increased.

However, when spatial reuse transmission is performed using only such a method, it may be difficult to find an optimal transmission power 200 and an energy detection threshold 220 that depend on the environment. If the receiver is close to the interference source, the damage due to the additional interference may be greater than the transmission time gain obtained through spatial reuse transmission.

Accordingly, in the method and apparatus for spatial reuse transmission according to an embodiment of the present invention, performance of spatial reuse transmission can be predicted through distribution of channel quality information and average access latency, and whether space reuse transmission is determined based on the value. Accordingly, in an environment in which space reuse transmission causes performance degradation, space reuse transmission may not be used, thereby improving space reuse rate and yield performance and lowering network congestion.

3 is a conceptual diagram illustrating a determination for spatial reuse transmission according to an embodiment of the present invention.

In FIG. 3, spatial reuse transmission is performed by comparing frequency efficiency (spatial reuse transmission) and frequency efficiency (non-spatial reuse transmission). The method is disclosed.

Referring to FIG. 3, the transmitter may determine frequency efficiency (space reuse transmission) 300 and frequency efficiency (non-space reuse transmission) 320.

The transmitter may determine whether to transmit the spatial reuse based on the comparison of the frequency efficiency (spatial reuse transmission) 300 and the frequency efficiency (non-spatial reuse transmission) 320.

For example, if the frequency efficiency (spatial reuse transmission) 300 is greater than the frequency efficiency (non-spatial reuse transmission) 320 (or greater or equal), the transmitter transmits data to the receiver through the spatial reuse transmission. Can.

Conversely, if the frequency efficiency (space reuse transmission) 300 is less than or equal to (or less than) the frequency efficiency (non-space reuse transmission) 320, the transmitter does not use the space reuse transmission and does not use the space reuse transmission. Data. The non-spatial reuse transmission of the transmitter does not perform transmission by adaptively adjusting the transmission strength to the external interference signal, and transmits based on the energy detection threshold (or specific energy detection threshold) determined based on the maximum transmission power. It may be a transmission method for determining.

The frequency efficiency (spatial reuse transmission) 300 and the frequency efficiency (non-spatial reuse transmission) 320 may be determined by considering CQI-specific frequency efficiency, transmission success probability of a specific MCS, and transmission time efficiency. Frequency efficiency for each CQI is expressed in terms of frequency efficiency for each channel state information, and the probability of successful transmission of the MCS can be expressed in terms of probability of successful transmission for each data modulation and coding.

Equation 1 below is an equation for determining the frequency efficiency (spatial reuse transmission) 300 and the frequency efficiency (non-spatial reuse transmission) 320.

<Equation 1>

Here, SE _nSR may _mean frequency efficiency (non-spatial reuse transmission) 320 and SE _SR may mean frequency efficiency (spatial reuse transmission) 300.

In addition, i is an index number of each CQI, and SE _i may mean frequency efficiency of each CQI. SE _i may be a predetermined value. Specifically, as the CQI has a relatively low value, an MCS having a relatively low efficiency should be used as a poor channel, and the frequency efficiency may also have a relatively low value.

r _air is a transmission time efficiency, and may be a value of efficiency of utilization of time resources in non-spatial reuse transmission. Transmission time efficiency is specifically described in FIG. 5.

p _nSR is the probability of success of the MCS corresponding to a specific CQI in non-spatial reuse transmission, and p _SR is the probability of success of the MCS corresponding to a specific CQI in spatial reuse transmission.

The transmitter may receive channel quality indicator (CQI) feedback from each receiver. In addition, the transmitter can independently collect CQI feedback when transmitting at the maximum transmission power and CQI feedback when performing space reuse transmission by reducing the transmission power.

When transmitting the non-spatial reuse of the transmitter (or transmitting the maximum transmission power), p _nSR is determined based on the CQI feedback, and by reducing the transmission power of the transmitter, the p _SR can be determined based on the CQI feedback when transmitting the spatial reuse.

Specifically, p _nSR may be a success probability value of an MCS corresponding to a specific CQI in a non-spatial reuse transmission of a transmitter, and p _SR may be a success probability value of an MCS corresponding to a specific CQI when using a spatial reuse transmission. p _nSR can be expressed in terms of non-spatial reuse transmission (MCS success probability) and p _SR is spatial reuse transmission (MCS success probability).

Equation 2 below is a formula for determining p _nSR and p _SR .

<Equation 2>

;

;

,

,

In Equation 2, N _i may be the number of CQI feedbacks having an i value in non-spatial reuse transmission, and M _i may be the number of CQI feedbacks having i value in spatial reuse transmission.

If there is no CQI feedback for spatial reuse transmission, p _SR,q may be determined as shown in the following equation instead of the CQI feedback of the collision cluster.

<Equation 3>

In Equation 3, c is the highest CQI value among the CQI feedbacks of the collision cluster.

According to an embodiment of the present invention, a collision cluster and a non-conflict cluster may be classified based on CQI feedback.

The transmitter stores the channel quality indicator (CQI) received from the receiver for a specific period to know the CQI distribution. The receiver may feedback the CQI through the reception of the signal transmitted by the transmitter, and the feedback CQI distribution may be divided into a CQI distribution when there is a collision and a CQI distribution when there is no collision.

4 is a conceptual diagram illustrating CQI distribution for clustering according to an embodiment of the present invention.

In FIG. 4, when a transmitter (for example, a base station) transmits a signal on an unlicensed band to a receiver (for example, a terminal), the transmitter (for example, a base station) specifies a CQI fed back from the receiver (for example, a terminal) for a specific period. Stored for a while to know the CQI distribution.

If there is a possibility (or the possibility of interference) that a signal transmitted by the transmitter may collide with another signal when the receiver receives, the CQI distribution fed back by the receiver has a collision (or interference) with the CQI distribution when there is a collision (or interference). It may appear as a separate CQI distribution. In the present invention, the expression collision is used, but collision can be interpreted as meaning including various interferences to signals.

For example, referring to the graph, when a signal transmitted by a transmitter is transmitted to a receiver without collision, CQI may be a relatively high value (for example, 15), and a signal transmitted by the transmitter may be a receiver after collision When delivered to, CQI may be a relatively low value (eg, 1 to 7).

The transmitter may classify the previously received CQI information. The received CQI information may be clustered using a clustering algorithm such as k-means clustering. The cluster including the highest CQI among the CQIs previously received by the transmitter may be classified as a non-conflicting cluster 420 and the remaining clusters may be classified as a collision cluster 400. The clustered CQI information may be CQI information collected during a set time (or set period) based on a specific time point or may be a specific number of CQI information collected based on a specific time point. Such clustering may be performed in an unsupervised clustering method.

Hereinafter, in an embodiment of the present invention, the CQI included in the non-conflicting cluster 420 is a non-conflicting CQI, and the CQI included in the collision cluster 400 may be expressed as a collision CQI.

In FIG. 4, it is assumed that the collision cluster 400 is one for convenience of description, but the collision cluster 400 may be a plurality. For example, the non-conflicting cluster 420 may be one cluster as the cluster including the highest CQI, and the remaining collision cluster 400 may be the remaining clusters excluding the non-conflicting cluster 420. That is, if the feedback CQI is not the CQI adjacent to the highest CQI based on the highest CQI (for example, 15) from the communication situation between the transmitter and the receiver, it may be determined that a collision occurs.

When the CQI information is newly received from the receiver, the cluster is updated, and whether the new CQI information is included in the collision cluster 400 or the non-conflict cluster 420 may be determined. Alternatively, it may be determined whether new CQI information is included in the collision cluster 400 or a non-conflict cluster without a separate cluster update.

According to an embodiment of the present invention, the number of CQI information included in the collision cluster 400 and the non-conflict cluster 420 and/or whether the recently received CQI is included in the collision cluster 400 or the non-conflict cluster 420 Based on whether or not the transmitter can determine the MCS.

In this way, if the collision cluster and the non-collision cluster are generated, and there is no CQI feedback for the space reuse transmission, p _{SR,q, which} is the space reuse transmission (MCS success probability), may be determined instead of the CQI feedback of the collision cluster.

5 is a conceptual diagram illustrating a method for determining transmission time efficiency according to an embodiment of the present invention.

In FIG. 5, a transmission time in space reuse transmission and a non-space reuse transmission for determining transmission time efficiency is disclosed.

Referring to FIG. 5, the first time resource 510 is a time resource in a non-spatial reuse transmission operation of the transmitter. The second time resource 520 is a time resource in the spatial reuse transmission operation of the transmitter.

The non-spatial reuse transmission operation is a transmission operation of a transmitter that does not operate by reducing transmission power separately for spatial reuse transmission, and the spatial reuse transmission operation is a transmission operation of a transmitter that operates by reducing transmission power separately for spatial reuse transmission.

In the non-spatial reuse transmission operation of the transmitter, the first time resource 510 may include a standby period (t _avgWait ) 530 and a maximum power transmission period 540. The waiting section 530 may be a section in which transmission is not performed due to external interference. The maximum power transmission period 540 may be a period in which the maximum power transmission of the transmitter is performed. When a non-spatial reuse transmission operation is performed, the transmitter may transmit data using the maximum power, and compare the energy detection threshold determined based on the maximum power with external interference to determine whether to transmit. If the external interference is greater than the energy detection threshold, the transmitter may stop transmitting the data, and the transmission stop time of the data may be a waiting time. Thereafter, when the external interference is less than the energy detection threshold, the transmitter may transmit data at the maximum power.

The second time resource 520 may include a space reuse transmission period 550 and a maximum power transmission period 560. The space reuse transmission section 550 may be a section for performing space reuse transmission by adjusting the transmission power of the transmitter in consideration of external interference. The maximum power transmission period 560 may be a period in which the maximum power transmission of the transmitter is performed. When the spatial reuse transmission operation is performed, the transmitter may adjust transmission power in consideration of external interference.

According to an embodiment of the present invention, the transmission time efficiency r _air may be determined based on Equation 4 below.

<Equation 4>

In the above equation, t _COT may be the length of the transmission time of the transmitter and t _avgWait may be the average waiting time. The average waiting time may be a time period during which a non-space reuse transmission operation does not transmit due to external interference.

For example, the average waiting time may be determined based on Equation 5 below.

<Equation 5>

The average waiting time may be determined as a weighted average value of the past average waiting time and the present average waiting time, and the weight a may be adjusted according to the yield.

6 is a conceptual diagram showing the performance of a method for determining spatial reuse transmission according to an embodiment of the present invention.

In FIG. 6, a throughput of a space reuse transmission determination method according to an embodiment of the present invention compared to an existing LTE-LAA (Licensed Assisted Access) transmission method is disclosed.

In the upper part of FIG. 6, a situation in which base station 1 and terminal 1 communicate and base station 2 and terminal 2 communicate is disclosed.

At the bottom of FIG. 6, the throughput measured according to the distance between the base station 1 610 and the terminal 1 615 and the distance between the base station 1 610 and the base station 2 620 in the situation at the top of FIG. 6. Is disclosed.

Specifically, the lower left of FIG. 6 is the yield when using the existing LTE-LAA (Licensed Assisted Access) transmission method, and the lower right of FIG. 6 is the yield when using the spatial reuse transmission determination method.

If the yield of the existing LTE-LAA transmission method is compared with the yield of the space reuse transmission determination method, the distance between the base station 1 610 and the base station 2 620 is a certain distance, and the terminal 2 625 and the base station 2 ( 620) By using the space reuse transmission determination method according to an embodiment of the present invention at a distance between a certain distance, it may have higher transmission efficiency than the existing LTE-LAA transmission.

7 is a block diagram illustrating a wireless device according to an embodiment of the present invention.

Referring to FIG. 7, the wireless device may be a transmitter or a receiver capable of implementing the above-described embodiment.

The transmitter 700 includes a processor 710, a memory 720, and a radio frequency unit (RF) 730.

The RF unit 730 is operatively connected to the processor 710 to transmit/receive radio signals.

The processor 710 may implement functions, processes, and/or methods proposed in the present invention. For example, the processor 710 may perform the operation of the transmitter disclosed in the embodiments of FIGS. 1 to 6.

For example, the processor 710 determines frequency efficiency (spatial reuse transmission) and frequency efficiency (non-spatial reuse transmission), and based on frequency efficiency (spatial reuse transmission) and frequency efficiency (non-spatial reuse transmission). It may be implemented to determine whether to transmit space reuse.

Frequency efficiency (spatial reuse transmission) may be a predicted value for frequency efficiency in spatial reuse transmission, and frequency efficiency (non-spatial reuse transmission) may be a prediction value for frequency efficiency in non-spatial reuse transmission.

The processor 710 may be implemented to transmit data based on the spatial reuse transmission, but the spatial reuse transmission may adjust the transmission strength according to the external interference in consideration of the strength of external interference. Frequency efficiency (spatial reuse transmission) is determined based on frequency efficiency for each channel state information, probability of successful transmission by data modulation and coding, and frequency efficiency (non-spatial reuse transmission) is frequency efficiency for each channel state information, data modulation and coding It can be determined based on the probability of success of each transmission and efficiency of transmission time.

The receiver 750 includes a processor 760, a memory 770, and a radio frequency unit (RF) 780.

The RF unit 780 may transmit/receive a radio signal in connection with the processor 760.

The processor 760 may implement functions, processes, and/or methods proposed in the present invention. For example, the processor 760 may be implemented to perform the operation of the receiver according to the above-described embodiment of the present invention.

The processor 760 may feedback channel status information such as CQI for a signal received from the transmitter to the transmitter.

The processors 710 and 760 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices, and/or converters that convert baseband signals and radio signals to each other. The memories 720 and 770 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and/or other storage devices. The RF units 730 and 780 may include one or more antennas that transmit and/or receive wireless signals.

When the embodiment is implemented in software, the above-described technique may be implemented as a module (process, function, etc.) performing the above-described function. The modules are stored in memory 720, 770 and can be executed by processors 710, 760. The memories 720 and 770 may be inside or outside the processors 710 and 760, and may be connected to the processors 710 and 760 by various well-known means.

Claims (8)

The space reuse transport method,
The transmitter determining frequency efficiency (spatial reuse transmission) and frequency efficiency (non-spatial reuse transmission); And
The transmitter comprises the step of determining whether the space reuse transmission based on the frequency efficiency (space reuse transmission) and the frequency efficiency (non-space reuse transmission),
The frequency efficiency (space reuse transmission) is a predicted value for frequency efficiency in space reuse transmission,
The frequency efficiency (non-space reuse transmission) is a method characterized in that the predicted value for frequency efficiency in non-space reuse transmission. According to claim 1,
The transmitter further comprises transmitting data based on the spatial reuse transmission,
The space reuse transmission is characterized in that the transmission strength is adjusted according to the external interference in consideration of the strength of the external interference. According to claim 2,
The frequency efficiency (space reuse transmission) is determined based on the frequency efficiency for each channel state information, data modulation and the probability of successful transmission for each coding. According to claim 2,
The frequency efficiency (non-spatial reuse transmission) is determined based on the frequency efficiency for each channel state information, probability of successful transmission by data modulation and coding, and transmission time efficiency. Transmitter performing space reuse transmission,
A communication unit implemented for data transmission; And
It includes a processor operatively connected to the communication unit (operatively),
The processor determines frequency efficiency (spatial reuse transmission) and frequency efficiency (non-spatial reuse transmission),
Is implemented to determine whether the space reuse transmission based on the frequency efficiency (space reuse transmission) and the frequency efficiency (non-space reuse transmission),
The frequency efficiency (space reuse transmission) is a predicted value for frequency efficiency in space reuse transmission,
The frequency efficiency (non-space reuse transmission) is a transmitter characterized in that the predicted value for frequency efficiency in non-space reuse transmission. The method of claim 5,
The processor is implemented to transmit data based on the space reuse transmission,
The spatial reuse transmission is a transmitter characterized in that to adjust the transmission strength according to the external interference in consideration of the strength of the external interference. The method of claim 6,
The frequency efficiency (spatial reuse transmission) is a transmitter characterized in that it is determined based on the frequency efficiency for each channel state information, data modulation and probability of successful transmission by coding. The method of claim 6,
The frequency efficiency (non-spatial reuse transmission) is a transmitter characterized in that it is determined based on the frequency efficiency for each channel state information, probability of successful transmission by data modulation and coding, transmission time efficiency.

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