KR20090052751A - Method for allocation wireless resources for cellular systems using wire relay stations - Google Patents

Abstract

The present invention relates to a radio resource management method in a cellular system using a relay station (RS), wherein a mobile terminal is provided through each relay station (RS) in a corresponding cell around a base station (BS). Receiving channel state information (CSI) of the mobile station (MS); and selecting at least one or more subchannels having excellent channel gains through the received CSI, and corresponding to each of the selected subchannels. Determining an RS as a service area for each channel, receiving a service request through the service area, and assigning a priority based on information stored in a user queue when the service request is made, the user queue is the CSI. Accessing the corresponding scheduler for each subchannel having excellent channel gain, and after the access, forms a user group for each same channel, Applying the power control algorithm preset on the includes the step of performing a joint power control.

RS, scheduling, subchannel

Description

Radio resource allocation method in cellular system using wired relay station {METHOD FOR ALLOCATION WIRELESS RESOURCES FOR CELLULAR SYSTEMS USING WIRE RELAY STATIONS}

The present invention relates to the radio resource allocation of a cellular communication system including a relay station (RS) using a dedicated line and a band, that is, a cellular communication system using a radio over fiber (RoF). The present invention relates to a radio resource allocation method in a cellular system using a wired relay station that performs packet scheduling and independent parallel radio resource allocation for each channel by determining different service areas for each channel to increase throughput.

One of the key technology for the continuous development of wireless communication systems is the efficient operation and distribution of frequency resources, and for this purpose, a single hop that allows only direct transmission from one base station (BS) per cell to the MS is established. The research on the extended multi-hop transmission method from the single-hop method is actively in progress. In the system supporting the multi-hop transmission, a signal is transmitted from the BS to the MS via RS, and direct transmission from the BS to the MS is also possible.

Examples of cellular systems currently implemented or implemented include single hop systems, single hop systems supporting repeaters, and wireless multi-hop systems. The single hop system has one BS per cell without a repeater and the terminal or MS is directly connected to the BS without a separate relay. In order to improve the reception signal performance of the MS in the cell boundary or shadow area by installing a repeater in the middle of the repeater system. At this time, one cell is composed of one BS and several repeaters, and the MS simultaneously transmits and receives signals from the BS and the repeater. At this time, it may be divided into a wired-optical repeater or a wireless-RF repeater structure according to the link between the BS and the repeater.

In addition, the wireless RS multi-hop system can be regarded as a multi-channel distributed antenna system that manages one cell together with the BS and RS, the multi-channel distributed antenna system is a BS and RS of the cellular system to transmit a signal It plays the role of antennas.

In the cellular communication system, throughput and quality of service (QoS) for each user are major indicators for determining transmission efficiency. Power control serves to improve these performance indicators. In particular, the user's received power is equalized to maintain an index indicating signal quality, that is, a signal to interference and noise ratio (SINR) at a constant value. Many types of power control algorithms focus on power control of respective terminals within a cell, and thus independent power control is performed for each base station.

As shown in FIG. 1, a RoF system may be viewed as a cellular system in which a cell is divided into small cells by dividing a service area for each BS / RS. Many existing power control algorithms are applied independently in each service area. When the frequency reuse coefficient inside the cell is 1, that is, when the same frequency is used for each service area, terminals located at a coverage boundary such as MS A suffer severe interference due to interference signals of other service areas. When power control is performed independently from the BS, the maximum power is allocated to MS A to increase the SINR value. However, the increase in the power of the MS A in the BS increases the amount of interference received by terminals in the service area of other RSs. In particular, terminals at the boundary of another service area, for example, a terminal such as MS B in FIG. 1, increase in the magnitude of the interference signal and cause a decrease in SINR value. Therefore, there is a limit in improving the SINR value of terminals located at the boundary in the divided cell if information is not exchanged between the allocated power in the service area of the BS and the RS and independent power control is performed.

In a conventional multichannel distributed antenna system, communication service areas between BSs or RSs are clearly distinguished. The communication service area is determined by the average state of channels at the current location of any MS, and the communication service is performed between MSs included in the service area of the BS or RS about one BS or RS. .

When the service area is determined, the MS requests a service only to the BS or RS of the corresponding area, and the scheduler of the BS or RS receives the subchannel of each MS according to the subchannel gain or other scheduling indicator of the MS requesting the service. It is decided whether to provide a service. In this case, after the scheduler performs a matching operation between the subchannels and the MS, power control is performed on the MS using the same subchannel in the corresponding cell, and channel allocation is performed based on the result of the scheduling and the power control.

In this way, since the service area of the multi-channel distributed antenna system is clearly divided into BS or RS units, the MS can request a service through one RS, so that the MS can receive the service only through the corresponding subchannel of the RS designated to receive the service. Can be.

However, the MS has different channel gains for each subchannel due to frequency selectivity due to different influences of frequencies, and in some cases, a particular subchannel has a higher channel gain to an adjacent RS than a channel gain to an RS designated to be serviced. In particular, it occurs frequently in MSs located at boundary areas between service areas of several RSs.

Therefore, since the MS located in the boundary region does not use a better channel, not only the transmission efficiency of the entire system is reduced, but there is a problem that transmission is not possible even though data transmission is possible according to a subchannel.

An object of the present invention relates to a radio resource allocation of a cellular communication system including a relay station (RS) using a leased line and a band, that is, a cellular communication system using a radio over fiber (RoF). The present invention relates to a radio resource allocation method in a cellular system using a wired relay station that performs packet scheduling and independent parallel radio resource allocation for each channel by determining different service areas for each channel in order to increase throughput.

According to an aspect of the present invention to achieve the above object, in a radio resource management method in a cellular system using a wired relay station (RS), in the cell centered around the base station (BS) Receiving channel state information (CSI) of a mobile station (MS) through each RS (Remote Station: RS), and at least one subchannel having excellent channel gain through the received CSI. Selecting a, determining a corresponding RS for each of the selected subchannels as a service area for each channel, and receiving a service request through the service area;

Priority is given based on information stored in a user queue when the service request is requested, and the user queue accesses a corresponding scheduler for each subchannel having excellent channel gain based on the CSI, and the access. And forming a user group for each channel, and performing a common power control by applying a preset power control algorithm to the formed group.

As described above, in the cellular system using wired RS, the service area can be provided to the MS from the excellent antenna for each subchannel by dividing the service area differently for each channel, thereby increasing the throughput of the entire system. In addition to this, it is possible to increase the transmission efficiency of the MS and reduce the probability of transmission failure by independently operating a separate system for each channel.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, specific details such as specific components are shown, which are provided to help a more general understanding of the present invention, and it is understood that these specific details may be changed or changed within the scope of the present invention. It is self-evident to those of ordinary knowledge in Esau.

First, in the present invention, all algorithms for communication between the BS / RS and the MS in the RoF system are performed in the BS and only the transmission is performed in the RS. Therefore, control information for all signals is collected to the BS. The BS allocates radio resources to each MS based on this.

In addition, in an embodiment of the present invention to be described later, a channel having an excellent channel state is allocated among a plurality of channels available for each of a plurality of MSs, wherein the allocated channel changes the channel state with time, and thus the allocated channel. Allocate a channel to the MSs when the state is good. In addition, according to the embodiment of the present invention, since a plurality of MSs can use a channel having excellent channel state, the channel having the excellent channel state is allocated to the MS having the highest priority. In other words, in an embodiment of the present invention to be described later, scheduling is performed by determining a channel and an MS having a maximum priority in consideration of channel states of respective channels and respective MSs. In addition, in the embodiments of the present invention to be described below, a cellular communication system is described as an example for convenience of description, but the scheduling method and apparatus proposed by the present invention can be applied to other communication communication systems as well as the cellular communication system. Of course.

FIG. 2 is a block diagram schematically illustrating a cooperative transmission scheme in which an MS provides different service areas for each channel in a cellular system using a wired relay station according to an embodiment of the present invention. Referring to FIG. Communication with the MS 200 is performed through several RSs (1, 2, 3) around one BS (not shown).

Since the MS 200 is provided with services from different RSs (1, 2, 3) for each sub-channel (A, B, C), RS (1, 2, 3) provides different service areas according to channels. Have

The service area is determined by an average state of channels at a location of an MS, and more particularly, communicates channel state information (CSI) of a plurality of MSs located in a corresponding cell of a BS with the MS. Receive via as many RSs as possible. In this case, since the subchannels have different channel gains to each RS due to frequency selectivity, and interference amounts vary depending on whether adjacent RSs use the same channel, the BS uses at least one of the best channel gains using the received CSI. The above subchannels are selected, and corresponding RSs of the selected subchannels are determined as service areas of the MS.

Here, the following assumptions are made for the application of the scheme according to the invention to the system of FIG.

BSs and RSs have different service areas per channel. That is, BSs or RSs transmit data to an MS having excellent channel gain for each channel.

The transmission frames of BS and RS are each composed of N subchannels, and the transmission frames composed of N subchannel groups are synchronized with each other in frequency / time.

Interference at the MS occurs only for the same channel.

Each scheduler of BSs and RSs simultaneously allocates the same subchannel to the MS as shown in FIG.

-MS can receive data from different RS for each subchannel.

As such, the structure of the case of transmitting a packet for information transmission in the system of the present invention having a different service area for each channel is schematically illustrated in FIG. 3.

내 전송되어야 하는 패킷들을 긴급 패킷 그룹으로 생성하여 스케줄링 시 우선적으로 서비스 요청 기회를 부여한다. 이때, 상기 생성된 긴급 패킷 그룹이 포함된 사용자 큐(0, 1,...K)는 상기 MS로부터 수신된 CSI를 기반으로 도 4a와 같이 채널 이득이 우수한 순서로 적어도 하나 이상의 부채널을 선별하고, 상기 선별된 부채널의 해당 스케줄러에 서비스를 요청한다. 이때, 서비스를 요청받은 부채널의 스케줄러를 선택하는 것은 채널 이득이 우수한 순서로 일정 수의 부채널의 스케줄러에 서비스를 요청(request)한다. Referring to FIG. 3, first, packets stored in user queues 0, 1, ... K in the buffer 310 of the BS are classified according to urgency. The packet classification is a scheduling period preset to satisfy a QoS condition.

By generating packets to be sent in an urgent packet group, priority is given to service request in scheduling. In this case, the user queues (0, 1, ... K) including the generated emergency packet group select at least one or more subchannels in the order of superior channel gain as shown in FIG. 4A based on the CSI received from the MS. The service is requested to the scheduler of the selected subchannel. At this time, selecting the scheduler of the sub-channel requesting the service requests the service to the scheduler of the predetermined number of sub-channels in the order in which the channel gain is excellent.

The scheduler for each subchannel of the corresponding RS (0, 1, ..M) receiving the service request from the user queue (0, 1, ... K) is a user queue (0) requesting the service as shown in FIG. , 1,... K) is selected according to a predetermined scheduling algorithm to grant a service request as shown in FIG. 4B.

The user queues (0, 1, ... K) that have received the service request accept the approval of the scheduler as shown in FIG. 4C and mount the packet on the subchannel of the RS.

As described above, the user queue, the RS, and the subchannels are matched with each other through service request, acceptance, and approval operations between the user queue, the RS, and the scheduler of the subchannels.

A user group for each channel is formed from the matching result, common power control is performed by applying a preset power control algorithm to the formed group, and a channel is allocated.

2, 3, and 5, the operation of the radio resource management in the cellular system using the wired relay station according to the preferred embodiment of the present invention will be described with reference to FIG. A radio resource management method according to an example will be described.

5 is a flowchart illustrating overall radio resource management in a cellular system using a wired relay station according to an embodiment of the present invention. Referring to FIG. 5, first, a BS obtains channel state information (CSI) of a plurality of MSs located in a corresponding cell through a plurality of RSs that can communicate with the MS (step 510).

The BS selects at least one or more subchannels having the best channel gain using the obtained CSI, and determines a corresponding RS of the selected subchannels as a service area of the MS (step 512).

내 전송되어야 하는 패킷들을 긴급 패킷 그룹으로 생성하여 상기 긴급 패킷을 포함하는 사용자 큐에 대하여 스케줄링 시 우선적으로 서비스 요청 기회를 부여하고(516 과정), 상기 과정을 통해 상기 사용자 큐, RS 및 부채널이 서로 매칭된다(518 과정).After receiving the service request from the MS through the determined service area (step 514), a scheduling period preset to satisfy the QoS condition

By generating packets to be transmitted in an emergency packet group to give priority to the service request when scheduling for the user queue including the emergency packet (step 516), through the process the user queue, RS and sub-channel Matches with each other (step 518).

A user group for each channel is formed from the matching result, and a common power control is performed by applying a preset power control algorithm to the formed group (step 520), the channel is allocated (step 522), and the allocated channel is determined. In step 524, the packet is transmitted.

On the other hand, the above-described system of the present invention can be represented by a mathematical model for this purpose defines the parameters shown in Table 1.

parameter Explanation k (k = 1, ... K) User index m (m = 1, ... M) Repeater index

Repeater

And users

Between

Th channel

Repeater

Channel

About

Power allocated to

Repeater

From

By channel

Power Received Through

user

Channel

Noise power for

user

Channel

Repeaters (antennas) serviced through

user

Minimum and maximum values of power allocated to

, 송신 신호 행렬

, 잡음

는 하기의 수학식 1과 같이 정의된다.Channel matrix from this

Transmission signal matrix

, Noise

Is defined as in Equation 1 below.

는 하기의 수학식 2와 같이 표현된다.Received signal matrix for the subchannel n

Is expressed by Equation 2 below.

의 (j,i)성분은 사용자

에게 채널 n을 통해 전송되어야 하는 신호의 송신전력이 사용자

에게 수신된 전력을 나타내며 하기의 수학식 3으로 정의 된다.Where matrix

The (j, i) component of is the user

Transmit power of signal to be transmitted through channel n

It represents the power received by and is defined by Equation 3 below.

Diagonal elements of the received signal matrix Y represent the transmit power of the signal to be transmitted, and non-diagonal components represent the interference power. The diagonal element represents a desired signal and the non-diagonal element represents an interference signal. When the BS or RS has a specific service area, all of the components representing the transmission signal that do not belong to the coverage area of the individual MS among the matrix X components are all zeros. This may be expressed as in Equation 4 below.

The information on the service area of the MS at each location is expressed by Equation 5 below.

성분

는 사용자 k가 채널

을 통해 서비스를 받 는 RS를 의미한다.Where matrix A

ingredient

The user k channel

RS that receives service through.

내에 전송되어야 할 긴급 패킷을 갖는 사용자 큐의 사용자들의 부채널 n에 대한 채널 행렬을

라 정의한다. 상기

은 행렬

에서 스케줄링의 대상이 되는 MS들의 채널 행렬이다. And, if the packet is transmitted from the BS to the MS, a preset scheduling period

The channel matrix for subchannel n of users of the user queue with urgent packets to be transmitted in

It is defined as remind

Silver matrix

Is a channel matrix of MSs to be scheduled in.

로 정의된다. 이때, 상기

는 M * M 정방 행렬이다. The user queue, RS and subchannels are matched with each other through service request, acceptance, and acknowledgment operations between the user queue, RS, and subchannel scheduler, and through this, the channel matrix of subchannel n of the selected user queues is

Is defined as At this time, the

Is the M * M square matrix.

은 모두 N개 존재한다. 상기

행렬의 (j,i)성분은 하기의 수학식 6과 같이 표현된다.For example, if the system consists of N subchannels, the matrix

Are all N. remind

The (j, i) component of the matrix is expressed by Equation 6 below.

At this time, the received power transmitted through the channel n from the user k is expressed as in Equation 7 below.

In addition, the interference power received through the channel n in the user k is expressed by Equation 8 below.

In addition, the signal to interference and noise ratio (SINR) of the channel n in the user k is expressed by Equation 9 below.

As described above, the method for determining a different service area for each channel according to the present invention applicable to a wired cellular system requires information on a subchannel of a corresponding RS used by the user queue in the scheduling process of the user queue. Since the service area for each channel needs to be determined, the service area for each subchannel is determined by applying Equation 10 below.

Here, it means that the user k is to receive the service from the corresponding RS having the best channel gain in the channel n.

가 생성된다. Next, considering the QoS, the selected user queue, that is, MSs,

Is generated.

를 근거로 BS의 스케줄러는 상기한 도 3에서와 같이 사용자 큐 즉, MS, RS 및 부채널을 서로 매칭하고, 억세스를 시도하는 새로운 MS에 대한 채널 행렬

을 생성한다. The service area information matrix A and the channel matrix

Based on this, the scheduler of the BS matches a user queue, i.e., MS, RS, and subchannels with each other, as shown in FIG.

Create

An index indicating a channel state in the matching process is expressed by Equation 11 below.

값을 갖고, 매칭 과정은 도 4 a, b 및 c에 나타낸 바와 같이 부채널별로 독립적으로 수행된다.Equation 11 represents the value of CSI in subchannel n of MS k. If the value of the CSI is large, it can be seen that the channel state of the subchannel n of the MS is good. In the MS, for all subchannels

With a value, the matching process is independently performed for each subchannel as shown in Figs. 4A, 4B and 4C.

값이 우선하는 순으로

개 까지 서비스 요청을 수행한다.4a shows a process of requesting a service to a corresponding scheduler of a subchannel by a user queue in the system of the present invention. In order to limit the number of service requests for each user, the process is not performed independently. Perform batch operation on the channel. In this case, the user queue is the same for all the given subchannels.

In order of value

Up to service requests.

값을 갖는 사용자 큐에 상기 서비스 요청에 대한 허가(grant)한다. FIG. 4B shows that a user queue requesting a service in the system of the present invention selects a predetermined user queue according to a predetermined scheduling algorithm and grants the service request independently. Each subchannel scheduler is the first priority among user queues requesting service.

Grant the service request to a user queue with a value.

이 가장 우선하는 부채널의 서비스 요청 허가를 수락(accept)한다. FIG. 4C illustrates a process in which a user queue granted a service request in the system of the present invention accepts an approval of a corresponding scheduler, and is independently performed for each subchannel. The user queue is one of the subchannels that transmit the grant message.

Accept the service request permission of this most preferred subchannel.

As described above, in the system of the present invention having a different service area for each channel, a user queue requests a service to a corresponding scheduler of a subchannel, approves it, and transmits a packet through a process of accepting the scheduler's approval. The common power control is performed by a power control algorithm preset for each subchannel.

In addition, the system of the present invention proposes a combined power control scheme using the following linear programming (LP).

Objective function

값을 최대화 하는 함수를 목적함수로 정한다. Variable in Equation 12

The function that maximizes the value is defined as the objective function.

Constraints ( constraints )

1. Minimum SINR value to be guaranteed

Equation 13 denotes a targert SINR value of the MS targeted by power control.

2. SINR  Difference

3. Power range

Equation 15 shows the minimum and maximum values of the transmission power, and the power control is performed in parallel for each subchannel. The common power control scheme of such a flow will be described in detail later with reference to FIG. 6.

Hereinafter, a method of managing radio resources in a cellular system using a wired relay station according to a preferred embodiment of the present invention will be described with reference to the quantified detailed operation of the present invention and FIG. 6.

Referring to FIG. 6, in operation 610, an SINR value of an MS targeted by power control is initialized, and a service area information matrix A for each channel of a user is determined (operation 612).

내에 전송되어야 할 긴급 패킷을 갖는 사용자 큐의 사용자들의 부채널 n에 대한 채널 행렬을

라 정의한다. 상기

은 행렬

에서 스케줄링의 대상이 되는 MS들의 채널 행렬이다. In operation 614, a user queue including an emergency packet group to be transmitted within a predetermined period considering QoS is selected. Here, the preset scheduling period

The channel matrix for subchannel n of users of the user queue with urgent packets to be transmitted in

It is defined as remind

Silver matrix

Is a channel matrix of MSs to be scheduled in.

로 정의된다. 예를 들어, N개의 부채널로 구성된 시스템이라면 상기 행렬

은 모두 N개 존재한다. The selected user queue selects at least one or more subchannels in the order of the best channel gains based on the CSI received from the MS, and accesses a request, approves, and accepts a service of the scheduler of the selected subchannel. The user queue, RS, and subchannel are matched to form a link to the corresponding MS, and a group of MSs using the same channel is formed to select the formed link group (step 616). The channel matrix for subchannel n of the selected user queues is

Is defined as For example, if the system consists of N subchannels, the matrix

Are all N.

로 정의된다. 예를 들어, N개의 부채널로 구성된 시스템이라면 상기 행렬

은 모두 N개 존재한다. 상기

행렬의

성분은 하기의 수학식 6과 같이 표현된다.In operation 618, the common power control is performed by applying the preset power control algorithm to the link group selected in operation 618. In this case, the common power control is performed in parallel / independently for each subchannel, and optimizes the common power control in the subchannel n. In step 620, it is determined whether an optimal solution exists for each subchannel.

Is defined as For example, if the system consists of N subchannels, the matrix

Are all N. remind

Matrix

The component is represented by Equation 6 below.

를 갱신하는 반복횟수가 증가하게 되고, 이로 인해 전체 시스템에서의 연산 복잡도가 증가하여 운용상에 문제가 발생하므로, 전력의 제한된 전력이나 연산량을 고려하여 상기

를 갱신하는 반복 횟수를 제한할 필요가 있다. 상기 반복 횟수를 줄이기 위해 목표 SINR의 값을 감소시켜서 전력제어를 수행한다. 즉, 상기 수학식 13의 구속조건을 완화시키면 최적해가 존재할 확률이 높아지므로, 상기 목표 SINR값을 일정 값 이하로 낮추는 것이다. In step 630, if there is an optimal solution for each subchannel, the channel assignment user queue state is updated. If there is no optimal solution, the process proceeds to step 622. FIG. In this case, if the optimal solution does not exist, the above process may be performed by removing and adding a link.

Since the number of repetitions of updating is increased, and this leads to an increase in computational complexity in the entire system, causing problems in operation,

We need to limit the number of iterations to update. In order to reduce the number of repetitions, power control is performed by decreasing the value of the target SINR. In other words, if the constraint of Equation 13 is relaxed, the probability of the optimal solution is increased, so that the target SINR value is lowered to a predetermined value or less.

)에 1을 추가하여, 링크의 제 거 및 추가 과정의 반복 횟수를 체크하고(624과정), 이를 통해 최대 반복 횟수(

)를 초과하면, 상기 목표 SINR값을 낮추고(626과정), 상기 618과정으로 진행하여 최적해가 존재하는 지의 여부를 다시 확인한다. Therefore, the number of repetitions in step 622 (

) By adding 1 to check the number of repetitions of the link removal and addition process (step 624).

), The target SINR value is lowered (step 626), and the process proceeds to step 618 to check again whether or not an optimal solution exists.

In step 624, the number of repetitions of the process of removing and adding links is checked. If the maximum number of repetitions is not exceeded, the MS is removed and selected (step 628), and the process is returned to step 616 again. do.

The rule for removing the MS of a specific link in step 628 is selected by Equation 16 below.

로의 링크를 제거하고, 제거된 링크를 대신하여 채널 n에 대하여 MS

와 같은 서비스 영역을 선택하는 MS 중 전력제어 대상이 아닌 특정 MS

로의 링크를 선택하는데, 그 규칙은 하기의 수학식 17과 같이 표현된다. If there is no solution of power control optimization in subchannel n, the MS selected by Equation 16

MS on channel n on behalf of the removed link

MS that selects service area such as

To select the link to the rule, which is expressed as in Equation 17 below.

는 부채널 n에서 전력 제어 대상이 아닌 MS 중 가장 우선하는 채널 이득을 가지는 MS를 의미한다. Where

Denotes an MS having a channel gain of the highest priority among the MSs not the power control target in the subchannel n.

Thereafter, in step 632, if the allocated subchannel and the packet to be transmitted exist, the process proceeds to step 614 and repeats the above process. If not, the scheduling is terminated by ending the power control operation. do.

As described above, an operation related to a radio resource allocation method in a cellular system using a wired relay station according to an embodiment of the present invention can be performed. Meanwhile, the above-described description of the present invention has been described with reference to specific embodiments. This may be practiced without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but by the claims and equivalents of the claims.

1 is a schematic block diagram of a cellular system using a wired relay station to which the present invention is applied.

2 is a block diagram schematically illustrating a cooperative transmission scheme in which an MS provides a different service area for each channel in a cellular system using a wired relay station according to an embodiment of the present invention.

3 is a conceptual configuration diagram of radio resource allocation in a cellular system using a wired relay station according to an embodiment of the present invention;

Figure 4a, b, c is an exemplary view showing three processes of the user queue in the system of the present invention requesting, accepting and accepting a service to the corresponding scheduler of the sub-channel

5 is a flowchart illustrating overall radio resource allocation in a cellular system using a wired relay station according to an embodiment of the present invention.

6 is a detailed flowchart illustrating overall radio resource allocation in a cellular system using a wired relay station according to an embodiment of the present invention.

Claims (14)

In the radio resource allocation method in a cellular system using a wired relay station (RS), Receiving channel state information (CSI) of a mobile station (MS) through each relay station (Remote Station: RS) in a corresponding cell based on a base station (BS: Base Station); Selecting at least one or more subchannels having excellent channel gains through the received CSI, determining a corresponding RS for each selected subchannel as a service area for each channel, and receiving a service request through the service area; Assigning a priority based on information stored in a user queue when the service is requested, and accessing the corresponding user queue to a corresponding scheduler for each subchannel having excellent channel gain based on the CSI; And after the access, forming a user group for each channel and performing common power control by applying a preset power control algorithm to the formed group. Assignment method. 2. The method of claim 1, wherein if the minimum SINR is not satisfied as a result of performing the power control, the scheduler removes a specific packet in the user queue and allocates a channel allocated to the removed packet to another packet. A method of allocating a radio resource in a cellular system using a wired relay station, the method further comprising the step of performing power control again. The method of claim 1, wherein the assigning of the priorities comprises: Grouping packets to be transmitted within a predetermined scheduling period into an emergency packet group; The user queue including the grouped emergency packet group may include requesting a service to a corresponding scheduler of the selected subchannel by selecting at least one or more subchannels in order of excellent channel gain based on the CSI. A radio resource allocation method in a cellular system using a wired relay station. The method of claim 1, wherein the subchannels have different channel gains for each RS due to frequency selectivity. The method of claim 1, wherein the user queue, A method for allocating radio resources in a cellular system using a wired relay station, characterized in that sessions are stored according to user-specific QoS. The method of claim 1, wherein the accessing process comprises: The user queue requesting a service from a corresponding scheduler of each subchannel; Granting a service request by selecting one user queue from among the user queues according to a preset scheduling algorithm; The approved user queue is a radio resource allocation method in a cellular system using a wired relay station, characterized in that it includes a process of accepting the approval of the scheduler. The method of claim 1, wherein a user queue, an RS, and a subchannel match each other through the access process. The channel matrix of claim 1, wherein the cellular system using the wired relay station is defined as in Table 2 below.

Transmission signal matrix

, Noise

Is defined by Equation 18, and the subchannel

Received signal matrix for

Is defined by Equation 19, and the information on the service area of the MS is defined as in Equation 20 below. parameter Explanation k (k = 1, ... K) User index m (m = 1, ... M) Repeater index

Repeater

And users

Between

Th channel

Repeater

Channel

About

Power allocated to

Repeater

From

By channel

Power Received Through

user

Channel

Noise power for

user

Channel

Repeaters (antennas) serviced through

user

Minimum and maximum values of power allocated to

Where matrix

of

ingredient

Is a user

Channel

RS serviced via 8. The method of claim 7, wherein the matrix

of

Ingredient is MS

A channel

The transmit power of the signal to be transmitted through the MS

The radio resource allocation method in a cellular system using a wired relay station, characterized in that the power received by the, and is defined as in Equation 21 below.

The method of claim 8, wherein

Matrix

The component is defined as shown in Equation 22, and the received power transmitted through channel n in MS k is defined as shown in Equation 23, and the interference power received through channel n in MS k as shown in Equation 24. The SINR of the channel n in the MS k is calculated by using Equation 25 below.

The method according to claim 1 or 7, And an index indicating a channel state of the MS in subchannel n during the access process is defined as in Equation 26 below.

The method of claim 1, wherein the preset power control algorithm, The equalization of the SINR value of the MS is performed according to Equation 27, and the guarantee of the minimum amount of data received is to guarantee the minimum SINR value according to Equation 28, and the power allocated in advance in the BS / RS is preset. The method of allocating a radio resource in a cellular system using a wired relay station according to Eq.

The radio resource allocation method in a cellular system using a wired relay station according to claim 2, wherein the following equation (30) is applied to remove the specific packet.

The wired relay station as claimed in claim 2, wherein in assigning a channel allocated to the removed packet to another packet, when a specific link is selected from the service area of the channel, Equation 30 below is applied. Radio resource allocation method in one cellular system.

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