KR101499814B1 - Method and apparatus for allocating radio resource - Google Patents

Abstract

Disclosed is a radio resource allocation method and apparatus for ensuring fair use of radio resources among different systems. A method of allocating radio resources between two or more different systems according to an embodiment of the present invention includes: setting a non-resource utilization ratio using the radio resources among the systems during a reference time; Obtaining a sensing threshold value of each of the systems using the resource utilization ratio; And determining whether the radio resource is being used by the remaining system on the basis of the sensing threshold at each of the systems, wherein comparing the sensing threshold of each of the systems with the energy magnitude of the channel, And determines that the radio resource is used when the energy level is equal to or greater than the sensing threshold value. Once the sensing thresholds for each system have been determined, it is possible to independently ensure channel access fairly without additional processes.

System, radio resource, resource utilization ratio, empty state detection probability, sewing probability, threshold

Description

TECHNICAL FIELD [0001] The present invention relates to a method and an apparatus for allocating radio resources,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to wireless communication, and more particularly, to a method and apparatus for allocating radio resources between different systems.

The use of radio spectrum and the regulation of radio emissions are coordinated by national agencies such as the Radio Bureau of Korea or the Federal Communications Commission (FCC) of the United States. As part of the wireless regulation, an authorization for the use of a particular band of frequencies is provided to the operator and is extended for a period of time. In general, different frequency bands are assigned to different types of wireless services. Exemplary wireless services include, for example, wireless-navigation and wireless location tracking, mobile communication, and TV-broadcasting. An authorized operator typically has the exclusive right to use each radio resource that provides the wireless service, so there is no need to share that radio resource with another operator. Here, the radio resource refers to a frequency channel of a predetermined location and time.

Operators in an authorized frequency band often have a proprietary right to use the radio resources of the assigned band, so these frequency bands can be used inefficiently. However, this is not of interest to the regulatory agency for the use of the radio spectrum. There is a central coordinator between users of the same type of system in the authorized frequency band and such coordinator tries to achieve high efficiency in the use of radio resources. However, in the unlicensed frequency band, there is no central coordinator, and the radio system automatically adjusts the use of radio resources during operation. Unlicensed frequency bands can provide broad wireless services due to public availability, but they can only be used effectively when the use of radio resources is clearly coordinated.

Accordingly, there is a need for a radio resource allocation method that can efficiently share radio resources between different systems in an unlicensed frequency band. WO 2004/112325, proposed by Mangold, presents a model of how radio resources are used in unlicensed frequency bands.

Figure 1 shows a simplified model of radio resource usage in the unlicensed frequency band proposed by Mangold.

Referring to FIG. 1, there is shown three different wireless systems 120A, 120B, and 120C that operate in the unlicensed frequency band 110. FIG. Wireless system 120A operates on three frequency channels (center frequencies f2, f5, f8). Wireless system 120B operates on nine frequency channels (center frequencies f1 through f9) as a narrow band wireless system. The wireless system 20C operates on one frequency channel (center frequency f5) as a wide band wireless system. Here, 'narrow band' and 'broad band' are terms related to the reference bandwidth. The frequency channels of the different systems 120A, 120B, and 120C overlap each other. Thus, there must be a radio resource allocation provision for coordinating the use of radio resources between the radio systems 120A, 120B, and 120C.

When a minimum channel is referred to as a reference channel, the radio system 120A uses three reference channels, and the radio system 120B uses one reference channel as a basic resource unit. The fair use of radio resources can not be coordinated because the basic resource units are different. Thus requiring the wireless system 120B, which is a narrowband system, to scan the full reference channel bandwidth 140 as well as the narrowband frequency channel on which it operates. For example, in order for the wireless system 120B to communicate on the frequency channel f2, it is necessary to scan f1, f2 and f3 beforehand (hereinafter referred to as' Channelized-Listen before talk (C-LBT) And to coordinate the fair use of radio resources in accordance with regulations.

However, even if the above-described method is used, the sensing may not be perfect and a collision may occur between the two systems, and the traffic models of the two systems may adversely affect fairness in other realistic environments. It is difficult to use radio resources fairly perfectly between systems.

SUMMARY OF THE INVENTION The present invention provides a radio resource allocation method and apparatus for ensuring fair use of radio resources among different systems.

According to an aspect of the present invention, there is provided a method for allocating radio resources between two or more different systems, the method comprising the steps of: (a) (B) obtaining a sensing threshold value of each of the systems using the resource utilization ratio; and (c) determining, based on the sensing threshold value in each of the systems, And determining whether the system is being used by the remaining system.

According to an aspect of the embodiment, in the step (b), one or more of the system characteristic information of each of the systems may be used together to obtain the sensing threshold value.

According to another aspect of the present invention, the step (b) includes the steps of: (b1) using one or more of the system characteristic information of each of the systems to determine an empty state detection probability of each of the systems satisfying the resource utilization ratio And (b2) obtaining the sensing threshold value using at least one of the empty state detection probability and the missing probability.

According to still another aspect of the present invention, in the step (c), when the energy level of the channel is equal to or greater than the sensing threshold value, the radio resource is used It can be judged.

A method for allocating radio resources between two or more different systems according to another embodiment of the present invention includes the steps of using a non-resource use ratio using the radio resources among the systems during a reference time in each of the systems, Comparing the energy level of the channel with the sensing threshold of each of the systems obtained by using one or more of a radio resource unit, an arrival rate, a service rate, and a target sensing probability of each of the systems, And determines that the radio resource is used by the remaining system when the radio resource is equal to or greater than the threshold value.

An apparatus for allocating radio resources between two or more different systems according to another embodiment of the present invention includes a resource utilization ratio setting unit for setting a non-resource utilization ratio using the radio resources among the systems during a reference time, Setting unit; A sensing threshold acquiring unit for acquiring a sensing threshold value of each of the systems using one or more of the set resource utilization ratio and a radio resource unit, an arrival rate, a service ratio, and a target sensing probability of each of the systems; And an energy magnitude comparison unit for comparing the energy level of the channel with the sensing threshold value. When the energy level of the channel is greater than or equal to the sensing threshold value, it is determined that the radio resource is used by the remaining system.

 The method and apparatus for allocating radio resources according to the embodiment of the present invention can guarantee the fairness of radio resource use while adjusting the sensing threshold of the system. In addition, if the sensing thresholds of the respective systems are determined, the access to the unlicensed frequency band can be fairly independently ensured without any additional process.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following examples are provided to aid understanding of the present invention and the present invention is not limited to the following examples.

In an embodiment of the present invention, the method of allocating radio resources is defined independently of any particular radio system, and any possible transmission scheme capable of determining whether the channel is empty with energy magnitude sensed in the channel, e.g., Spread spectrum, orthogonal frequency division multiplexing (OFDM), and the like. Also, in the embodiment of the present invention, since a central controller exists in a defined frequency band, regardless of a specific frequency band, radio resources are allocated, and therefore, the unlicensed frequency band is mainly described. Here, radio resources and resources can be used as synonyms.

Systems that intend to use the unlicensed frequency band as a channel perform spectrum sensing before approaching the corresponding frequency band. Each system should use the channel only when the channel is empty after sensing the channel before using the spectrum. The method of allocating radio resources according to an embodiment of the present invention adjusts the sensing threshold used in the spectrum sensing process to adjust the opportunity to access the unlicensed frequency band between each system, .

In the unlicensed frequency band, various systems having different radio resource units and traffic models coexist. In the embodiment of the present invention, two different systems, which are a wide band system (WBS) and a narrow band system (NBS), coexist in an unlicensed frequency band according to a radio resource unit of a frequency band used by the systems I suppose. This can be applied, for example, by coexisting of three or more different systems. When three or more systems coexist, they can be classified into a wide band system (WBS) and a narrow band system (NBS) according to the radio resource units used.

Figure 2 shows a wideband system (WBS) and a narrowband system (NBS) according to an embodiment of the invention.

Referring to FIG. 2, an example in which the wideband system 220 and the narrowband systems 230 and 240 coexist within the unlicensed frequency band 200 is shown. In the case of the narrowband system 230 and 240, W is used as a radio resource unit for one user, and 2 watt per user is used for the broadband system 220 in the case of a narrowband radio resource unit as a reference channel (bandwidth W) It is used as a resource unit. When the entire unlicensed frequency band 200 is divided into reference channels of the bandwidth W, the two systems coexist within the unlicensed frequency band. Here, the number of reference channels in which the wideband system 220 and the narrowband systems 230 and 240 coexist is two, and the statistical characteristics of the two reference channels 2W are equal to the statistical characteristics of the entire bandwidth in the unlicensed frequency band . Therefore, the following description will be applied to two reference channels 2W capable of coexistence of the two systems.

Even if resources are shared in the same time zone, the amount of resources used by each system varies depending on the characteristics of the systems. Assuming that the time when the i- th user of the system ( x ) uses the unlicensed frequency band for a specific time is T _x ( i ), the resource utilization ( U _x ) used by the system ( x )

,

이다.Where T _s is the reference time and φ _x is the ratio of the resources used by one user of the system x among the total bandwidth. Based on the broadband system and the narrowband system according to the embodiment of the present invention,

,

to be.

Broadband systems and narrowband systems use different radio resource units as well as different traffic models. Specifically, the broadband system has the arrival rate ( λ _w ), the narrowband system has the arrival rate ( λ _n ), and these are called the Poisson ( λ _w ) random process and the Poisson ( λ _n ) . , Assumed to these exponential distribution (Exponential distribution) each having a mean time to each of said 1 / _w and μ 1 / μ _n the service time of the wideband system and the narrowband system. Here, μ _w and μ _n , which are reciprocals of the service time, are referred to as service rates. The arrival rate ( λ ) refers to the frequency of occurrence of traffic that the user desires to use the channel, and the service time ( μ ) refers to the time taken from using the channel to terminating use. The arrival rate ( λ ) and the service time ( μ ) are called traffic information.

3 is a flowchart illustrating a radio resource allocation method according to an embodiment of the present invention.

인 순환 대칭 복합 가우시안 (circularly symmetric complex Gaussian: CSCG) 노이즈와 CSCG 신호가 전송된 경우, 목표 감지 확률(P _D ^target )은 다음 수학식 2와 같다.Referring to FIG. 3, information (hereinafter, referred to as 'system characteristic information') necessary for adjusting the sensing threshold value ? Of the systems is collected (S310). Here, the system characteristic information includes a radio resource unit, Traffic information and target detection probability ( P _D ^target ). If the average value is 0 and the variance is

The target detection probability ( P _D ^target ) is expressed by the following equation (2) when the CSCG signal and the circularly symmetric complex Gaussian noise are transmitted.

Here, N denotes the number of used samples and? Denotes a signal to noise ratio (SNR).

For example, the system characteristic information when the broadband system senses a channel includes radio resource units (W), traffic information ( ? _N, 占 _n ) and target detection probability ( P _D ^target ) of the narrowband system. System characteristics information when the narrowband system senses a channel includes radio resource units (2W), traffic information ( ? _W, 占 _w ) and target detection probability ( P _D ^target ) of the broadband system. Here, the target detection probability ( P _D ^target ) of the wideband system and the narrowband system may be the same or different.

Broadband systems and narrowband systems can obtain system characteristic information of different systems through a common control channel that transmits only these system characteristic information. A common control channel capable of efficiently transmitting only specific information between systems can be used. In addition, the step S310 may be omitted if system characteristic information of a different system is already known. For example, unlicensed frequency band of 2.4GHz is used by WLAN and Bluetooth together. Since the radio resource unit and the traffic information of a specific system are unique values, knowing the system used in the unlicensed frequency band, the system characteristic information of a different system is already known. In this case, step S310 may be omitted.

Referring to FIG. 3, a non-human resource use ratio? Using radio resources for a reference time between systems is set (S320)

The resource utilization ratio (α) in the wideband system and the narrowband system is expressed by the following equation (3).

In Equation (3), when? Is 1, the corresponding frequency band is used fairly during the reference time between systems. The resource utilization ratio (?) May vary depending on various factors. For example, on an unauthorized frequency band, it would be fair to allocate more radio resources to systems that are more expensive or more efficient to use, based on the mediator's earnings. The resource utilization ratio? Is expressed by Equation (4) based on the traffic load.

In addition to Equation (4), considering the priorities determined between systems, the resource utilization ratio?

Here, ρ _x represents the priority of the x system.

Referring again to FIG. 3, a probability value satisfying the resource utilization ratio? Is calculated using the system characteristic information (S330). Here, the probability value is calculated as an empty state detection Refers to at least one of a null-detection probability ( P _ND ) and a miss probability ( P _M ), which will be described below.

As described above, the system characteristic information includes radio resource units of different systems, traffic information ([ lambda] _, mu ) And a target detection probability ( P _D ^target ). Here, the traffic information ([ lambda] _{, [} mu] ) can be expressed by the rate of change for each state when modeling the spectral approach process.

Figure 4 shows a Markov chain for modeling a spectral approach process that does not account for inter-system collisions.

Referring to FIG. 4, in a modeling 400 of a spectrum access process that does not consider conflicts for a wideband system and a narrowband system, the state? 420 represents a state in which only one broadband system user is using resources. State 0 (440) indicates a state where all of the reference spectrums 2W are empty. In this case, the system does not exist. State 1 (460) indicates that only one narrowband system user is using resources. State 2 (480) indicates that two narrowband system users are using resources. Here, λ and μ _{j j} denotes the cloth rate (transition rate) cross without considering the collision between the system state.

Each system must first sense the channel before using the frequency band and use it only when the channel is empty. However, due to the limitation of the sensing method, a sensing error may occur. In such a case, a collision occurs between the systems. There is a central controller between users of the same system to avoid this conflict. Collisions may still occur between users of different systems in the unlicensed frequency band.

Figure 5 shows a Markov chain for modeling a spectral approach process according to an embodiment of the present invention. FIG. 5 is a view of the system collision due to a sensing error in FIG. 4.

및

는 시스템들간 충돌 확률까지 고려한 각 상태간 천이율(transition rate)을 나타낸다. 한 시스템의 특정 사용자가 채널에 도착하였을 때, 채널이 비어 있는 상태이고 이를 비어 있는 채널로 제대로 감지해야 채널을 사용할 수 있다. 채널이 사용 중이나 센싱 오류가 발생하여 비어 있는 채널로 감지하게 되면, 시스템들간 충돌이 일어난다. 따라서, 상태 0(540)가 된다.센싱 오류로 인한 시스템간 충돌까지 고려한 상태들간의 천이율들을 결정하기 위해서는 트래픽 정보뿐만 아니라 빈 상태 검출 확률(Null-detection probability, P _ND ) 및 미싱 확률(Missing probability, P _M )이 영향을 미친다. 5, state 520, state 0 (540), state 1 (560), and state 2 (580) in modeling 500 of the spectral approach process correspond to states? 420, State 0 (440), state 1 (460), and state 2 (480). here,

And

Represents the transition rate between each state considering the probability of collision between systems. When a particular user of a system arrives at a channel, the channel is empty and must be properly detected as an empty channel to use the channel. When a channel is in use or sensing error occurs and it is detected as an empty channel, a collision occurs between the systems. Therefore, in order to determine the transition rates between the states considering the inter-system collision due to the sensing error, the Null-detection probability ( P _ND ) and Missing probability (Missing) probability, P _M ).

The empty state detection probability ( P _ND ) is the probability of detecting that the empty channel (H ₀ ) is actually empty, as shown in the following equation (8).

The unsuccess probability P _M is expressed by the following Equation 7 as a probability of detecting an empty channel H ₁ as empty.

인 순환 대칭 복합 가우시안 (circularly symmetric complex Gaussian: CSCG) 노이즈와 CSCG 신호가 전송된 경우 빈 상태 검출 확률 P _ND (ε)과 미싱 확률 P _M (ε)은 다음 수학식 8와 같다.If the average value is 0 and the variance is

The empty state detection probability P _ND (ε) and the missing probability P _M (ε) when the CSCG signal and the circularly symmetric complex Gaussian noise are transmitted are expressed by the following equation (8 ) .

Here, N denotes the number of used samples and? Denotes a signal to noise ratio (SNR). As mentioned above, the missing probability ( P _M ) is P _M (ε) = 1 - P _D (ε) in relation to the ^target detection probability ( P _D ^target ). The empty state detection probability P _ND (ε) and the sewing probability P _M (ε) are summarized based on the sensing threshold value ε in Equation (8).

The sensing thresholds of broadband and narrowband systems are defined as ε _w and ε _n , respectively. The empty state detection probability ( P _ND ) and the sewing probability ( P _M ), respectively, from the standpoint of the system are P _{M , w,} P _{ND , w} P _{M , n} P _{ND , n} . Through these probability values, the state transition rate of FIG. 5 is expressed by the following equation (10).

_{Here, P c, w, P c} , n ' , and P _{c , n} " represents the probability that a collision will occur in state ω, state 1 and state 2, respectively. A collision occurs when a user of a different system arrives before a service in progress on a particular channel arrives and a sensing error is detected and an empty state is detected and the channel is accessed. The probability of occurrence of such a collision ( P _{c , w} , P _{c , n} ', P _{c , n} " ) is defined by the following equation (11).

는 평균 서비스 시간(1/μ')을 가지는 사용자를 서비스하는 시간 동안(

) 채널에 평균 도착율(λ')을 가지고 상이한 시스템의 사용자가 도착할 확률을 나타내고 다음 수학식 12로 정의된다.here,

(1 / mu ' ) < RTI ID = 0.0 >

) Denotes the probability that a user of a different system will arrive with an average arrival rate ([ lambda] ' ) on the channel, and is defined by the following equation (12).

Here, t _{λ '} represents the arrival time interval between systems having an average arrival rate of λ' .

5, the steady state probability of the states 520, 540, 560 and 580 is calculated by the flow conservation law of each state according to the following equations (13) and same.

The stability state probabilities ( P _?, P _{1 ,} P ₂ ) in FIG. 5 are summarized using the resource utilization ratio? In Equation (3).

This can be expressed by Equation (13) below.

This is simplified by using Equations 10 to 11, and is summarized as an empty state detection probability ( P _ND ).

Here, c ₁ , c ₂ , c ₃ and c ₄ are constants as follows.

Simplified empty detection probability (P _ND) is traffic information of the probability _{P ND, w, P ND,} n, P M, n has a (λ, μ) by a constant which is represented by the equation (16) Function. Here, P _M (?) Can be defined as P _ND (?) By Equation (9 ) , so that the simplified empty state detection probability P _ND is a function of the probability values P _{ND , w} , P _{ND , n} .

를 만족시키기 위한 시스템의 센싱 임계값은 일정값(ε ^max ) 이하가 되어야 한다(

). 이러한 시스템의 센싱 임계값 조건을 만족시키는 빈 상태 검출 확 률(P _ND )들의 범위(

)도 수학식 8를 통해 알 수 있다. 자원 이용률 측면에서 목표 감지 확률(P _D ^target )을 보장해 주는 범위 내에서 빈 상태 검출 확률(P _ND )을 최대화하여야 하므로, 자원 이용비(α)를 만족하는 P ^* _{ND ,w} , P ^* _{ND ,n} 는 다음 수학식 17로 정의된다.As described above, the sensing threshold value ? Of the system is generally set to satisfy the ^target sensing probability ( P _D ^target ) required in the system. Accordingly,

Sensing threshold of the system to satisfy is to be not more than a predetermined value (ε ^max) (

). The range of empty state detection probabilities ( P _ND ) satisfying the sensing threshold condition of this system

) Can also be found from the equation (8). Since the empty state detection probability ( P _ND ) must be maximized within a range that guarantees the ^target detection probability ( P _D ^target ) in terms of the resource utilization rate, P ^* _{ND , w} , P ^* _{ND , n} satisfying the resource utilization ratio (?) Is defined by the following equation (17).

3, a sensing threshold value epsilon ^* _s of the system according to the calculated probability value P ^* _{ND, s} is obtained (S340). Using Equation 8 and Equation 17, the sensing threshold value ? ^* _s of the system satisfying the following equation (18) is defined by the following equation (18).

3, the system compares the detected energy of the channel with the sensing threshold epsilon ^* _s of the system by spectral sensing (S350). For example, if the wideband system detects the energy detected in the channel in the broadband system the sensing threshold is a narrow band system channels as compared with the (ε ^* _w) determines whether in use or that the channel is empty.

In an embodiment of the present invention, an energy detector is used as a spectrum sensing technique. However, this is only an example and various other spectrum sensing techniques can be used. The energy detector determines whether the channel is in use (H ₁ ) or not (H ₀ ) if it exceeds the sensing threshold ( ε ^* _s ) of the system based on the energy value detected in the channel. 3, if the detected energy of the channel is smaller than the sensing threshold value ? ^* _S of the system, it is determined to be an idle channel (H ₀ ) and the channel is accessed (S360) If the detected energy of the channel is greater than the sensing threshold ? ^* _S of the system, it is determined to be a busy channel (H ₁ ) and the access of the channel is not allowed (S370). Only when the detected energy is smaller than the sensing threshold ? ^* _S of the system, it is determined that the channel is empty, and the access to the channel is allowed to allocate radio resources.

Next, the experimental example of the present invention and the effect therefrom will be described.

Using 128 samples, the target detection probability ( P _D ^target ) was 0.9 and the signal-to-noise ratio (SNR) was -5 dB. The sensing threshold value [ epsilon] ^* of the adjusted system according to the embodiment of the present invention is shown in Table 1 below. In other cases, the same sensing threshold ( ε _w = ε _n = ε ^max ) is assumed to be used.

6 is a graph showing the resource utilization rate when the same service rate is used between systems. Referring to FIG. 6, when α = 1, no adjustment is made in the case where the service rates between systems are equal ( μ _w = 1, μ _n = 1) (General case) (Proposed STC) and the Mangold's C-LBT scheme (Ux). In a general case, a narrowband system with a small radio resource unit uses more resources than a broadband system with a large radio resource unit. As described above, the Man-Gold C-LBT technique uses a channel only when a narrowband (NB) system senses as much bandwidth as a wideband (WB) system and judges that it is empty for fair use of resources . Using Mangold's C-LBT scheme, the difference in resource utilization between the narrowband system and the broadband system is less than the general case, but the narrowband system still uses a lot of resources. In case of adjusting the sensing threshold value of the system according to the embodiment of the present invention (Proposed STC), the resource utilization ratio between the two systems is maintained to be equal, thus ensuring fair use.

Referring to Table 1, it can be seen that the sensing threshold value ε ^* _n of the narrowband system is set to be smaller than the sensing threshold value ε ^* _w of the wideband system in the same traffic model. When the system's sensing threshold ( epsilon ) is low, the channel is easily detected as busy. This limits the chance of system use by a system user with a lower sensing threshold value ( ε ), and at the same time gives users of different systems an opportunity to use more channels. Thus, fair use between systems can be guaranteed using thresholds set in accordance with embodiments of the present invention.

FIG. 7 is a graph showing resource utilization rates when different service rates are used between systems. Referring to FIG. 7, in a case where α = 1, no adjustment is made in the case where the service rates between systems are different ( μ _w = 0.5, μ _n = 2) (General case) (Ux) when the system's sensing threshold is adjusted (Proposed STC) and when Mangold's C-LBT technique is used. In the general case of FIG. 7, the broadband system uses resources for a longer time because the radio resource unit is large but the service rate ( μ _w ) is low. Thus, a broadband system uses more resources than a narrowband system. Mangold's C-LBT technique does not work well with different service rates. This is because the radio resource unit is small but the narrowband system with high service rate has a much smaller resource use opportunity. According to the embodiment of the present invention, when the sensing threshold of the system is adjusted (Proposed STC), it can be confirmed that the fair use is maintained even if the traffic model is changed.

FIG. 8 is a graph illustrating resource utilization ratio versus resource utilization ratio according to an embodiment of the present invention when different service rates are used between systems. Referring to FIG. 8, there is shown a resource utilization ratio between two systems in which the service threshold is adjusted according to the resource utilization ratio (α) when the service ratio is different between systems ( μ _w = 0.5, μ _n = 2). It can be confirmed that the resource utilization ratio (U _NB / U _WB ) is proportional to the resource utilization ratio (α).

The invention being thus described, it will be obvious that the same way may be varied in many ways. Such modifications are intended to be within the spirit and scope of the invention as defined by the appended claims.

Figure 1 shows a simplified model of radio resource usage in the unlicensed frequency band proposed by Mangold.

Figure 2 shows a wideband system (WBS) and a narrowband system (NBS) according to an embodiment of the invention.

3 is a flowchart illustrating a radio resource allocation method according to an embodiment of the present invention.

Figure 4 shows a Markov chain for modeling a spectral approach process that does not account for inter-system collisions.

Figure 5 shows a Markov chain for modeling a spectral approach process according to an embodiment of the present invention.

 6 is a graph showing the resource utilization rate when the same service rate is used between systems.

FIG. 7 is a graph showing resource utilization rates when different service rates are used between systems.

FIG. 8 is a graph illustrating resource utilization ratio versus resource utilization ratio according to an embodiment of the present invention when different service rates are used between systems.

Claims (8)

1. A method for allocating radio resources between two or more different systems, (a) establishing a non-human resource utilization ratio using the radio resource among the systems during a reference time; (b) obtaining a sensing threshold value of each of the systems using the resource utilization ratio; And (c) determining whether the radio resource is being used by the remaining system based on the sensing threshold in each of the systems.  The method according to claim 1, Wherein the sensing threshold value is obtained by using one or more of the system characteristic information of each of the systems in the step (b).  3. The method of claim 2, The step (b) (b1) using at least one of the system characteristic information of each of the systems to obtain at least one of an empty state detection probability and a sewing probability of each of the systems satisfying the resource utilization ratio; And (b2) obtaining the sensing threshold value using at least one of the empty state detection probability and the missing probability. The method according to claim 1, Wherein the step (c) compares the sensing threshold value of each of the systems with the energy level of the channel, and determines that the radio resource is used when the energy level of the channel is equal to or greater than the sensing threshold value. Assignment method.  5. The method of claim 4,  Wherein the comparison of the sensing threshold of each of the systems with the energy magnitude of the channel is performed using an energy detector.  1. A method for allocating radio resources between two or more different systems, Using one or more of a non-in-resource use ratio using the radio resource between the systems and a radio resource unit, an arrival rate, a service rate and a target detection probability of each of the systems during a reference time in each of the systems And comparing the sensing threshold value of each of the obtained systems with the energy level of the channel to determine that the radio resource is being used by the remaining system when the energy level of the channel is greater than or equal to the sensing threshold value. The method according to claim 6,  Wherein the sensing threshold of each of the systems is determined by detecting an empty state detection of each of the systems obtained using the resource utilization ratio and one or more of a radio resource unit, an arrival rate, a service rate, And estimating a radio resource allocation using at least one of a probability and a missing probability. 1. An apparatus for allocating radio resources between two or more different systems, A resource utilization ratio setting unit that sets a non-resource utilization ratio using the radio resources among the systems during a reference time; A sensing threshold acquiring unit for acquiring a sensing threshold value of each of the systems using one or more of the set resource utilization ratio and a radio resource unit, an arrival rate, a service ratio, and a target sensing probability of each of the systems; And And an energy magnitude comparison unit for comparing the sensing threshold value and the energy magnitude of the channel, wherein when the energy magnitude of the channel is equal to or greater than the sensing threshold value, the wireless resource allocation unit determines that the wireless resource is used by the remaining system Device.

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