KR100588003B1 - Adaptive spectrum allocation method using sharing spectrum between different operators in multi-band mobile communication system - Google Patents

Abstract

 1. TECHNICAL FIELD OF THE INVENTION

 The present invention relates to an adaptive spectrum allocation method using spectrum sharing between heterogeneous operators in a multiband mobile communication system.

 2. The technical problem to be solved by the invention

 The present invention shares frequency bands individually allocated to each operator in a multi-band mobile communication system as one single spectrum, and maximizes frequency utilization efficiency by adaptively allocating users belonging to other operators according to call rejection rate and traffic conditions. The purpose of the present invention is to provide an adaptive spectrum allocation method using spectrum sharing among heterogeneous operators in a multiband mobile communication system.

 3. Summary of Solution to Invention

 The present invention relates to a spectrum allocation method in a multi-band mobile communication system in which frequencies are individually assigned and operated for each service provider. Determining the other station access order according to the call rejection rate; And when the user terminal to which the call was rejected re-requests a call to the base station of the third party vendor, the base station of the third party vendor provides the available frequency to the user terminal according to the priority determined in the step of determining the access point of the other station and the current base station traffic state. Includes an adaptive FA reassignment step to reallocate.

 4. Important uses of the invention

The present invention is used for spectrum allocation in a multiband mobile communication system.

CDMA, multiband mobile communication systems, adaptive spectrum sharing, dynamic spectrum allocation, frequency sharing, spectrum sharing, call rejection rate, FA reallocation

Description

Adaptive Spectrum Allocation Method using sharing spectrum between different operators in multi-band mobile communication system}

1 is a configuration example of a seven-cell (One-Tier Cell) to which the present invention is applied,

2 is a diagram illustrating an embodiment of an adaptive spectrum allocation method using spectrum sharing between heterogeneous operators in a multiband mobile communication system according to the present invention;

3 is a flowchart illustrating a call processing method in a multi-band mobile communication system to which the present invention is applied;

4 is a flowchart illustrating an adaptive spectrum allocation method using spectrum sharing between heterogeneous operators in a multiband mobile communication system according to the present invention;

5 is a flowchart illustrating a method for determining priority of accessing another base station according to the present invention;

6 is an explanatory diagram of a performance comparison between the adaptive spectrum allocation method and the conventional fixed spectrum allocation method according to the present invention.

* Explanation of symbols on the main parts of the drawings

100: cell area 101, 102: base station

103: user terminal

The present invention relates to an adaptive spectrum allocation method using spectrum sharing between heterogeneous operators in a multi-band mobile communication system. More particularly, the present invention relates to a frequency spectrum allocated to each operator in a multi-band mobile communication system as one single spectrum. Adaptive spectrum allocation method using spectrum sharing among heterogeneous operators in multi-band mobile communication system that can maximize frequency utilization efficiency by adaptively allocating to users belonging to other operators according to call rejection rate and traffic condition It is about.

Conventional spectrum allocation is performed by fixed spectrum allocation (FSA), which allocates a carrier frequency having a fixed bandwidth to a service provider in consideration of service environment, quality, and interference effects. Operators use these allocated radio frequency resources to provide users with wireless communication services.

Since the conventional fixed spectrum allocation method has to consider the interference and service environment between adjacent bands, there are limitations in terms of service type and system capacity that can be provided, and especially since the service environment changes rapidly during the movement of the communication system. There was a problem that the capacity must be reduced.

Accordingly, a frequency sharing scheme has been proposed as a method for solving such a problem. As an example, a dynamic spectrum allocation method (DSA) will be briefly described.

The proposed dynamic spectrum allocation method (Communication system and method of sharing a communication resource (EP1 220557A1, 2002.07.03)) proposed by the conventional frequency sharing scheme is based on the environment in which various systems exist within the same service area and users' mobile environment. Consider a portion or all of the fixed allocated spectrum between individual systems as one shared spectrum, and blocks within the shared spectrum (carrier frequencies with fixed frequency bandwidths) dynamically adapt to the demands of call volume changing over time. Is assigned.

The conventional dynamic spectrum allocation method as described above is achieved through 'reciprocal frequency leasing between heterogeneous systems'. In addition, in order to prove the spectrum utilization efficiency of the conventional dynamic allocation method, the dynamic spectrum allocation method is applied in consideration of the environment where the Universal Mobile Telecommunication System (UMTS) and the Digital Video Broadcast Terrestrial (DVB-T) system coexist and fixed spectrum The case of the allocation method was compared and analyzed (Dynamic Spectrum Allocation in multi-radio environment: concept and algorithm) (IST Mobile and Wireless Telecommunication Summit 2001, co-authored with Leaves.P, 6, pp.53-57, 2001.3).

However, the mechanism for dynamic spectrum allocation proposed in the prior art is difficult to apply to all mobile system environments, and the system control is very difficult to satisfy users who require services in real time.

In particular, in a multi-band CDMA system, the maximum number of users that can be accommodated in the spectrum is random due to the user's location, path attenuation, shadowing and fading. The allocation mechanism is difficult to predict the system performance, and there is a problem in that desired spectrum utilization efficiency cannot be obtained when the call volume patterns required by the system have a close correlation with each other.

 The present invention has been proposed to solve the above problems, in the multi-band mobile communication system by sharing the frequency bands individually assigned to each operator as a single spectrum, according to the call rejection rate and traffic conditions to users belonging to other operators The purpose of the present invention is to provide an adaptive spectrum allocation method using spectrum sharing between heterogeneous operators in a multi-band mobile communication system that can maximize frequency utilization efficiency by adaptive allocation.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

 In order to achieve the above object, the present invention provides a spectrum allocation method in a multi-band mobile communication system in which frequencies are individually assigned and operated for each service provider. Determining the access priority of the other base station according to the call rejection rate; And when the user terminal to which the call was rejected re-requests a call to the base station of the third party vendor, the base station of the third party vendor provides the available frequency to the user terminal according to the priority determined in the step of determining the access point of the other station and the current base station traffic state. An adaptive FA reassignment step that reassigns FAs.

The present invention treats frequency bands allocated to heterogeneous operators having the same CDMA mobile communication system as one single spectrum to share frequencies among heterogeneous carriers, so that the frequency is adaptively allocated from the user terminal side and shared from the carrier side. By flexibly allocating the allocated frequencies, the frequency utilization efficiency can be maximized. In addition, in a technical mechanism for flexibly allocating a shared spectrum, one or more base stations between heterogeneous operators may be installed in the same service area, and may be vertically disposed at the same location. In addition, frequency bands, which are conventionally fixed to heterogeneous carriers, may be treated as one single spectrum for flexible spectrum allocation. In this case, call admission control (CAC :) as an optimization technique for efficient use of radio resources in a mobile communication system. Call processing that performs service and system control using Call Admission Control, Handoff (HO) and Power Control (PC), load measurement and prediction, and frequency allocation and adaptation to optimal frequency An adaptive frequency allocation procedure with call admission control and the like are performed.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a configuration of a seven-cell (One-Tier Cell) to which the present invention is applied, wherein a base station operated by heterogeneous operators based on a CDMA mobile communication system is arranged in the same position in a vertical direction. Cell).

In the same service area 100 that the user terminal 103 can be serviced, one or more base stations may be installed between heterogeneous base stations (operator A 101 and operator B 102), and the present invention is applied. In an embodiment, the base stations operated by the respective operators are arranged in the same location.

2 is a diagram illustrating an embodiment of an adaptive spectrum allocation method using spectrum sharing between heterogeneous operators in a multi-band mobile communication system according to the present invention.

One frequency band (Company A frequency band 203, Operator B frequency band 204) individually assigned to a heterogeneous carrier (Company A 201, B 202) having the same CDMA mobile communication system 200 is used. By treating the spectrum as a single spectrum of heterogeneous carriers to share the frequency, the user terminal (terminal A (211), the terminal B (212) is adaptively allocated frequency in terms of the user, by flexibly assigning the frequency shared in the operator side It is an adaptive spectrum allocation method that can maximize frequency utilization efficiency.

In the adaptive spectrum allocation method, [operation-1] is a service request base station of each operator base station (terminal A, terminal A 211, terminal B 212) in order to provide services to users stably. Available in the frequency band (frequency band 203 allocated to operator A) and the frequency band 204 assigned to operator B, fixedly assigned to A 201, service request base station B 202 of terminal B. A fixed assignment (FA) (FA 213 assigned to terminal A and FA 214 assigned to terminal B) is allocated. In this case, a plurality of FAs exist in the frequency band allocated to each service provider so that the service can be supported when the service request of the user reaches a maximum value.

[Operation-2] and [Operation-3] indicate a process of attempting to access another operator's base station when the user's requested service is no longer supported by the FA allocated to each operator's base station. In this case, the user terminal (terminal A, terminal B) is adaptively assigned an FA according to whether the call is accepted through the call admission control (CAC), and the operator base station flexibly allocates the FA to the user terminal.

That is, in [operation-2], the other base station base station B 202 assigns the FA 221 to the terminal A. In [operation-3], the other base station base station A 201 sends the FA 231 to the terminal B. Indicates to assign.

3 is a flowchart illustrating a call processing method in a multi-band mobile communication system to which the present invention is applied.

In the process of call processing in a multi-band CDMA system, the total analysis time for obtaining the performance analysis result as shown in FIG. 5 and the time step for performance measurement ( Δt ) are determined and the call processing is performed. (Run Time Start step) (301).

Next, in the initial value setting step 302, the initial power, the allocated frequency band, the number of FAs, and other parameters (target threshold value, service transmission rate, call arrival rate, carrier frequency, initial vehicle speed and direction) of each operator base station and user terminal. And so on.

The call processing process according to the present invention includes an initial call connection step 303, an initial call admission control step 304, a call acceptance determination step 305, a call processing for an active user (power control (PC), handoff ( HO), etc.) step 307, adaptive shared spectrum allocation step 306 (FIG. 4), initial value updating step 308. Hereinafter, the call processing process will be described in detail.

First, when a user requests a call by accessing a corresponding base station to receive a service (initial call access step) (303), the base station performs call admission control for the user's call (initial call admission control step) ( 304, it is determined whether to accept the requested call (step of determining whether to accept the call) (305).

As a result, if the base station accepts the call, the user who requested the call becomes an active user (a user who can use the service), and in the base station, a power control (PC) for each active user and a hand for the mobile user OFF (HO) or the like (call processing step for the active user) 307.

If it is determined that the base station rejects the call, i.e., the base station does not have enough system capacity to accommodate the user, and the call rejected user requests the call back to the other operator base station, the other operator base station is the user of the heterogeneous operator. An adaptive shared spectrum allocation process for adaptively allocating FA is also performed (adaptive shared spectrum allocation step) (306, see FIG. 4).

Next, for the active user, the base station continuously provides the service until the user no longer requests the service, and among the parameter values set in the initial value setting step 302, the initial power, initial vehicle speed, and direction of the user base station. Are updated (initial value update step) 308.

It is determined whether or not the end of the total analysis time for measuring system performance (Run Time End determination step) (309), if the total analysis time is not finished, using the updated information of the user and the corresponding base station (308) Continue the call processing process. Otherwise, if the allotted analysis time ends, call processing is completed and system performance results are analyzed (see FIG. 5).

FIG. 4 is a flowchart illustrating an adaptive spectrum allocation method using spectrum sharing between heterogeneous operators in a multiband mobile communication system according to the present invention. It shows how to allocate spectrum flexibly to users who request again. 5 is a flowchart illustrating an embodiment of a method for determining priority of accessing another base station according to the present invention. Hereinafter, FIG. 4 and FIG. 5 will be described together.

The adaptive spectrum allocation method using spectrum sharing between heterogeneous operators in a multi-band mobile communication system according to the present invention is divided into two steps as follows.

First, call rejection rate (blocking probability or probability of unsatisfied user (Unsatisfied Probability)) at the current time interval (Current Timestep, t ~ t + Δt ) for each operator base station; By using the measured state information of the call rejection rate, some user terminals of each operator at the current time interval simultaneously re-request a call to another operator base station (other base station) to other base stations for the user terminals. The other station access priority determination step (401) of determining the access priority of the terminal. Here, Blocking Probability represents the number of blocked users against the total number of users who requested a call at the current time interval, and Unsatisfied Probability of the user whose call is not satisfied is the total activated amount due to the instantaneous system capacity exceeded. It indicates the number of unsatisfied users for the total number of users. Hereinafter, 'call rejection' will be used as a concept including a case where a call is blocked and a case where a call is not satisfied.

And, secondly, when the user terminal which has been rejected the call re-requests the call to another base station, the other base station is available (available to be available to the user terminal according to the priority determined in the other station access priority determination step and the current base station traffic conditions). Adaptive FA reassignment steps 402-408 to reallocate (free) frequency FA (determined).

Hereinafter, each step of FIG. 4 will be described in detail.

First, in another base station access priority (Priority or Random) determination step 401, the base station (operator A base station or operator B base station) is the initial call access step 303, the initial call admission control step 304 during the call processing process , And the number of rejected users (UA or UB) out of the total users who requested the call (call requested to operator A base station or call requested to operator B base station) at the same time after performing call determination step 305. As mentioned above, the number of users whose call is blocked or the number of users whose call is not satisfied among the active users who newly requested the call) is measured for each corresponding service provider. Then, using the measurement information, the access priority (Priority or Random) for the call re-request in the case where the user who has been rejected calls the other base station again is determined by the method as shown in FIG. . This is necessary for fairness related to call access to other base stations because call requests by users of corresponding base stations occur at the same time. If a user group of one (business A or business B) is arbitrarily given priority, overall system performance may be degraded.

Hereinafter, a method of determining prioritization of access of another base station according to FIG. 5 will be described in detail.

전체 사용자(사용자B) 수를 의미한다. 만약, 사업자 A의 기지국이 다수개인 경우에는 각 A기지국에서 호가 거절된 사용자 수의 합이 U_A가 되며, 사업자 B의 경우도 같다.First, U _A and U _B are compared (501). Where U _A is the total number of users (user A) rejected by the operator A base station, and U _B is the call rejected by the operator B base station.

It means the total number of users (user B). If there are a large number of base stations of service provider A, the sum of the number of users who are rejected at each base station is U _A , and service provider B is the same.

As a result of the comparison, if U _A > U _B , first, user A attempts to connect to another base station B, and then user A is given priority (priority) so that user B can try to access another base station A ( 502). That is, priority is given to the user belonging to the operator A.

As a result of the comparison, if U _A = U _B , user A or user B can randomly access another base station B or another base station A without priority (Random) (503).

As a result of the comparison, if U _A <U _B , first, user B attempts to connect to another base station A, and then user B is given priority, so that user A can try to access another base station B ( 504).

4, the load measurement and prediction step 402 will now be described. The load measurement and prediction step 402 includes a process of estimating required power for each user and a process of measuring currently allocated power for each base station (or base station ID).

After the other base station access prioritization step 401, the required power for the individual user (User A or User B) attempting to connect to another base station (other base station A or another base station B) Required Power) is estimated. Here, the required power for an individual user is the base station (eg, base station A to which the individual user (eg, user A) belongs to before attempting to connect to another base station (requesting a call to another base station). ) Is defined as the power requested.

In addition, the currently allocated power measurement for each base station (or base station ID) is that each base station (or base station ID: belonging to each operator (operator A or operator B) has a base station in one cell, each base station is unique Defined as the measurement of the currently allocated power).

For reference, the service area described in FIG. 1 includes seven cells for each provider. In addition, the required power for each user estimated in the load measurement and prediction step 402 and the currently allocated power for each base station (or base station ID) are used as information for the final FA allocation 407 in the next step 403.

On the other hand, in the next base station selection and FA availability prediction step 403, the FA availability prediction process is the status of each base station before allocating the FA assigned to the base station of the other operator, the user requesting the call again It is the process of identifying the information (service quality information, etc.) and predicting whether the selected FA will be available in advance.

In addition, the base station selection process is necessary because individual users having mobility can be located anywhere in the cell area and can be provided with a service at any location thereof. Here, another base station capable of reallocating an FA is selected to provide a service to an individual user. That is, another base station having a minimum distance between the user and each other base station (or another base station ID) at the current location of the individual user or the minimum propagation loss between the user and the base station is selected. At this time, the individual user is aware of another selected base station (or base station ID). In the following, other selected and recognized base stations will be referred to as "selected (recognized) base stations".

In addition, in order to assign a FA to a user, another selected (recognized) base station performs a FA availability prediction process for determining whether to select a FA that is expected to be available based on Equation 1 below. . Equation 1 below shows [Mechanism 1-1], [Mechanism 1-2], and [Mechanism 1-3] as a method for predicting FA availability according to the present invention.

i: base station (or base station ID) in the cell region, i = {1,2,3,4,5,6,7, ...}

F: FA assigned to the base station (or base station ID), provided that F = {1,2,3, ...}

Hi: Another base station (base station ID) selected (recognized) for each user among base stations (or base station IDs) i in the cell region, except that Hi = {1 or, 2 or, 3 or, ...}

P _{Hi, F} : Current allocated power amount by FA (F) allocated to selected (recognized) base station (Hi)

F _p : FA determined to be available among F, provided that F _p = {1 or, 2 or, 3 or, ...}

[Mechanism 1-1]

for F

선택된(인지된) 타 기지국(또는 기지국 ID)(Hi) 내에 할당된 FA(F)에서, 최대(Maximum) P_Hi,F 가 되는 FA를 Fp로 결정

From FA (F) assigned within another selected (recognized) base station (or base station ID) _Hi, determine the FA that becomes Maximum P _{Hi, F} as Fp

end

[Mechanism 1-2]

for F

선택된(인지된) 타 기지국(또는 기지국 ID)(Hi) 내에 할당된 FA(F)에서, 최소(Minimum) P_Hi,F 가 되는 FA를 Fp로 결정

In FA (F) assigned in another selected (recognized) base station (or base station ID) _Hi, determine the FA that becomes Minimum P _{Hi, F} as Fp

end

[Mechanism 1-3]

for F

선택된(인지된) 타 기지국(또는 기지국 ID)(Hi) 내에 할당된 FA(F)에서, P_Hi,F 가 소정의 기준값 이상이 되는 FA를 Fp로 결정

In FA (F) assigned in another selected (recognized) base station (or base station ID) _Hi, determine the FA where _{F Hi, F} is equal to or greater than a predetermined reference value

end

In short, as shown in [Equation 1], [Mechanism 1-1] determines the FA that has the maximum allocated power among the FAs allocated to the selected (recognized) base station (or base station ID) as the available FA. [Mechanism 1-2] is a mechanism for determining an FA that has the minimum amount of allocated power among the FAs assigned to the selected (recognized) base station (or base station ID) as an available FA, and [Mechanism 1-3] ] Is a mechanism for determining, as available FAs, FAs whose allocated power amount is greater than or equal to a predetermined power value among FAs assigned to the selected (recognized) base station (or base station ID).

Next, the FA (available FA) that is determined to be available through the FA availability prediction process of "403" is selected in the FA selection step 404 based on Equation 2 below. . In Equation 2 below, [Mechanism 2-1] and [Mechanism 2-2] are represented by the FA selection determination method 404 according to the present invention.

If, in the FA selection step 404, a FA has been selected ('Yes') predicted to be available at &quot; 403 &quot;, then the call re-requested by the individual user is accepted through call admission control 405. . Otherwise, if the predicted FA is not selected, the call re-requested by the individual user blocks (rejects).

i: base station (or base station ID) in the cell region, i = {1,2,3,4,5,6,7, ....}

F: FA assigned to the base station (or base station ID), provided that F = {1,2,3, ...}

Hi: Another base station (base station ID) selected (perceived) for each user among the base station (or base station ID) i in the cell region, except that Hi = {1 or, 2 or, 3 or, ...}

Ai: Adjacent (peripheral) other base stations (or base station IDs) surrounding other base stations (base station IDs) selected (recognized) for each user among base stations (or base station IDs) i in the cell area, for example, Hi = If 1, Ai = {2,3,4,5,6,7, ...}.

Fp: FA determined to be available in F, except Fp = {1 or, 2 or, 3 or, ...}

P _{Hi, FP} : Amount of currently allocated power by FA (Fp) allocated to another selected (recognized) base station (or base station ID) Hi

P _{Ai, FP} : Current amount of power allocated by FA (Fp) allocated to another neighboring base station (or base station ID) Ai

[Mechanism 2-1]

for Ai

일부 또는 모든 인접 타 기지국(또는 기지국 ID)(Ai)내에 Fp별 현재 할당된 전력량(P_Ai,FP)과 선택된(인지된) 타 기지국(또는 기지국 ID)(Hi)에 할당된 FA별(Fp) 현재 할당된 전력량(P_Hi,FP)의 비교

The amount of power currently allocated per Fp in some or all of the neighboring other base stations (or base station IDs) Ai (P _{Ai, FP} ) and for each FA assigned to the selected (recognized) other base station (or base station ID) Hi (Fp). ) Comparison of currently allocated power amount (P _{Hi, FP} )

  [Conditional expression]

If condition 1 (P _{Hi, FP} > P _{Ai, FP} ) is satisfied, select the corresponding Fp (the FA predicted as the available FA in “403” is selected as the reassignment FA),

  If condition 1 is not met, the corresponding Fp is not selected (reject call for request)

end

[Mechanism 2-2]

for Ai

일부 또는 모든 인접 타 기지국(또는 기지국 ID)(Ai)내에 Fp 별 현재 할당된 전력량(P_Ai,FP)과 선택된(인지된) 타 기지국(또는 기지국 ID)(Hi)에 할당된 FA별(Fp) 현재 할당된 전력량( P_Hi,FP)의 비교

The amount of current allocated by Fp in some or all of the other neighboring base stations (or base station IDs) Ai (P _{Ai, FP} ) and by the FAs assigned to other selected (recognized) base stations (or base station IDs) Hi (Fp). ) Comparison of Current Allocated Power (P _{Hi, FP} )

        [Conditional expression]

If condition 2 (P _{Hi, FP} <P _{Ai, FP} ) is satisfied, the corresponding Fp is selected (the FA predicted as an available FA in “403” is selected as the reassignment FA),

         If condition 2 is not met, the corresponding Fp is not selected (reject call for request)

     end

As can be seen from [Equation 2], [Mechanism 2-1] is selected (recognized) the amount of currently allocated power for each FA determined to be available among the FAs assigned to other neighboring base stations (or base station ID) The FA is a mechanism for selecting an FA when the amount of power allocated to the base station (or base station ID) is greater than the currently allocated amount of power, and [Mechanism 2-2] is for each FA allocated to the selected (recognized) base station (or base station ID). If the currently allocated power amount is greater than the currently allocated power amount for each FA determined to be available among the FAs allocated to the neighboring base station (or base station ID), this is a mechanism for selecting the FA.

On the other hand, the call re-requested by the individual user is executed in the call admission control 405, it is determined whether to accept in the call acceptance determination process (406). At this time, the call admission control 405 and the call acceptance determination process 406 are executed in the same manner as the initial call admission control 304 and the call acceptance determination 305 described above in FIG. That is, when a user who has been rejected a call re-requests a call to another base station, whether or not to reassign a free frequency to the user according to the priority determined in the other station access priority determination step 401 and the current other base station traffic conditions Is determined.

If the call re-requested by the individual user is accepted in the call acceptance decision process 406, the FA selected in the base station selection and FA availability prediction step 403 and expected in the FA selection step 404, is selected. Reassign to the user who re-requested the call (407). At this time, the user who has accepted the call becomes the active user and executes the call processing process of FIG. 3 (307), but the user whose call is rejected is blocked (408), thereby completing the adaptive shared spectrum allocation process.

As a result, while performing the above-described process, the base station of each operator can adaptively allocate the FA to the users of different operators in the allocated frequency band.

6 is an explanatory diagram of a performance comparison between the adaptive spectrum allocation method and the conventional fixed spectrum allocation method according to the present invention.

FIG. 6 shows a fixed spectrum allocation (FSA) method and an adaptive spectrum allocation (ASS) method according to the present invention for each operator (operator A, operator B, And blocking probability results with the overall system.

As shown in the figure, as a result, the adaptive spectrum allocation (ASS) method according to the present invention has a better performance than the conventional fixed spectrum allocation (FSA) at 1% blocking probability (0.01 blocking probability).

Performance is a 1% blocking probability for the maximum acceptable number of users (Users / 7BSs) in the entire cell range, where the adaptive spectrum allocation (ASS) method according to the present invention has more users than the conventional fixed spectrum allocation method. Indicates that additional services can be supported for. In other words, the total system capacity is increased.

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

The present invention as described above, in the multi-band mobile communication system to facilitate the service providing according to the real-time user request, and can be directly connected to other systems or operators to receive the service only by the frequency conversion of the user terminal, adaptive spectrum There is an effect of facilitating system control by sharing.

In addition, the present invention has the effect of increasing the spectrum utilization efficiency. That is, the total system user capacity is increased when the adaptive spectrum allocation method is applied by sharing the spectrum according to the present invention rather than the total system user capacity when the fixed spectrum allocation method is applied between integrated operators.

In addition, the present invention can predict the system performance even in an environment having random characteristics according to the user's location, path attenuation, shadowing and fading received by the user. In the case of having a close correlation with each other, there is an effect of increasing spectrum utilization efficiency.

Claims (12)

In the spectrum allocation method in a multi-band mobile communication system in which a frequency is assigned and operated for each communication provider, A second station access priority determining step of measuring a call rejection rate for each operator and determining a priority of access of a user whose call was rejected to a third party base station according to the call rejection rate; And When the user terminal which has been rejected the call re-requests the call to the base station of the third party vendor, the third party vendor base station is available to the user terminal according to the priority determined in the step of determining the access point of the other station and the current base station traffic state. Adaptive FA reassignment step to reallocate Adaptive spectrum allocation method using spectrum sharing between heterogeneous operators in a multi-band mobile communication system comprising a. The method of claim 1, The determining of the other station access order, A comparison step of measuring and comparing the number of users who have been rejected at a predetermined time interval for each operator; A priority assigning step of assigning priorities for accessing to a base station of a third party to a user belonging to a service provider with a large number of users whose calls are rejected as a result of the comparison; And As a result of the comparison in the comparison step, if the number of users rejected is the same among different operators, the random access step does not give priority to random access. Adaptive spectrum allocation method using spectrum sharing between heterogeneous operators in a multi-band mobile communication system comprising a. The method according to claim 1 or 2, The adaptive FA reassignment step, A load measurement / prediction step of estimating a required power for a user terminal requesting a call back to the third-party provider base station and measuring power currently allocated to each operator base station; Select a third party provider base station capable of allocating FA at the current location of the user terminal re-requesting a call, and select a base station predicting an available FA from the FAs allocated to the selected third party provider base station using the current allocated power amount for each FA And FA availability prediction step; A FA selection step of selecting an available FA predicted in the base station selection and FA availability prediction step as a reassigned FA according to a comparison of power with available FAs of other third party vendor base stations adjacent to the selected third party vendor base station; And FA reassignment step of allocating the FA selected in the FA selection step to the user terminal or rejecting the re-requested call according to whether the user terminal grants the request again. Adaptive spectrum allocation method using spectrum sharing between heterogeneous operators in a multi-band mobile communication system comprising a. The method of claim 3, wherein The user terminal power demand prediction process in the load measurement / prediction step, Adaptive spectrum allocation method using spectrum sharing between heterogeneous carriers in the multi-band mobile communication system, characterized in that predicted by the power requested to the base station to which the user terminal belonged before re-requesting the call to the third party provider base station. The method of claim 3, wherein The base station selection process in the base station selection and FA available prediction step, Adaptive spectrum allocation method using spectrum sharing between heterogeneous operators in a multi-band mobile communication system, characterized in that the base station is selected from a third-party provider with a minimum distance to the user terminal. The method of claim 3, wherein The base station selection process in the base station selection and FA available prediction step, Adaptive spectrum allocation method using spectrum sharing between heterogeneous operators in a multi-band mobile communication system, characterized in that the base station having a minimum propagation loss between the user terminal and the base station is selected. The method of claim 3, wherein The FA available prediction process in the base station selection and FA available prediction step, Adaptive spectrum allocation method using spectrum sharing between heterogeneous carriers in a multi-band mobile communication system, characterized in that the FA that the allocated power amount is the maximum among the FAs allocated to the selected third-party provider base station is determined as an available FA . The method of claim 3, wherein The FA available prediction process in the base station selection and FA available prediction step, Adaptive spectrum allocation method using spectrum sharing between heterogeneous carriers in a multi-band mobile communication system, characterized in that the FA that the allocated power amount is the minimum among the FAs assigned to the selected third party's base station is available FA . The method of claim 3, wherein The FA available prediction process in the base station selection and FA available prediction step, Adaptive spectrum allocation using spectrum sharing between heterogeneous carriers in a multi-band mobile communication system, characterized in that the FA that the allocated power amount is greater than a predetermined power value among the FAs allocated to the selected third-party provider base station Way. The method of claim 3, wherein The FA selection step, A power comparison step of comparing the amount of available FAs predicted in the base station selection and FA availability prediction step with the amounts of available FAs of other third party vendor base stations adjacent to the selected third party vendor base station; As a result of the comparison of the power comparison step, if the amount of available FAs predicted in the base station selection and FA availability prediction step is greater than the amount of available FAs of other third party vendor base stations adjacent to the selected third party vendor base station, the base station selection and FA availability prediction A reassignment FA step of selecting an available FA predicted in the step as a reassignment FA; And As a result of the comparison of the power comparison step, if the amount of available FAs predicted in the base station selection and FA availability prediction step is less than or equal to the power amounts of available FAs of other third party vendor base stations adjacent to the selected third party vendor base station, the request for rejection is rejected. Call rejection step Adaptive spectrum allocation method using spectrum sharing between heterogeneous operators in a multi-band mobile communication system comprising a. The method of claim 3, wherein The FA selection step, A power comparison step of comparing the amount of available FAs predicted in the base station selection and FA availability prediction step with the amounts of available FAs of other third party vendor base stations adjacent to the selected third party vendor base station; As a result of the comparison of the power comparison step, if the amount of available FAs predicted in the base station selection and FA availability prediction step is smaller than the amount of available FAs of other third party vendor base stations adjacent to the selected third party vendor base station, the base station selection and FA availability A reassignment FA step of selecting an available FA predicted in the prediction step as a reassignment FA; And As a result of the comparison of the power comparison step, if the amount of available FAs predicted in the BS selection and FA availability prediction step is equal to or greater than the available FAs of other third party vendor base stations adjacent to the selected third party vendor base station, the request for rejection is rejected. Call rejection step Adaptive spectrum allocation method using spectrum sharing between heterogeneous operators in a multi-band mobile communication system comprising a. The method of claim 3, wherein Whether the call is allowed in the FA reassignment step, A multi-band mobile communication system for determining whether to allow a call re-requested by the user terminal by using the traffic state of the base station for the FA selected in the FA selection step and the priority determined in the determination of the access point of the other station; Adaptive Spectrum Allocation Method Using Spectrum Sharing Among Heterogeneous Operators in.

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