KR101535373B1 - Radio resource allocation method and the apparatus - Google Patents

Abstract

A radio resource allocation method and apparatus therefor are disclosed. The radio resource allocation method includes the steps of (a) calculating a bit expectation value using a bit error rate (BER) of each layer block for each user group, each layer including a scalable video (SVC) coding; And (b) allocating radio resources in order from a base layer to a higher enhancement layer for each user group. In a layer exceeding a maximum resource number of the radio resources, And allocating resources.

Description

[0001] The present invention relates to a radio resource allocation method and apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio resource allocation method and apparatus for allocating radio resources by reflecting image characteristics and user characteristics of a user group.

Wireless communication systems generally allocate radio resources with a focus on optimization of radio resources. The conventional radio resource allocation method can optimize the communication performance. However, by allocating the radio resources without considering the device characteristics or the image characteristics possessed by the user, it is possible to allocate a lot of radio resources to users who do not need a high resolution image The wireless resources are wasted meaninglessly.

For example, a smartphone with a relatively small display size compared to a personal computer or a tablet PC does not need much allocation of wireless resources compared to a wireless personal computer or a tablet PC. However, There is a problem in that radio resources are allocated in the same manner as the radio resources.

Particularly, in the case of targeting a plurality of user groups such as broadcasting, the degree of unevenness of the display size may be larger, and the wireless resources are wasted as much as the communication frequency to be used is large.

The present invention provides a radio resource allocation method and apparatus capable of allocating radio resources in accordance with characteristics of an image and device characteristics of a user group.

According to an aspect of the present invention, there is provided a radio resource allocation method capable of allocating a radio resource by reflecting characteristics of an image and characteristics of a user group.

According to an embodiment of the present invention, there is provided a method of calculating a bit expectation value using (a) a bit error rate (BER) of each layer block for each user group, SVC: Scalable video coding); And (b) allocating radio resources in order from a base layer to a higher enhancement layer for each user group. In a layer exceeding a maximum resource number of the radio resources, A radio resource allocation method including allocating resources may be provided.

The radio resource is at least one of a sub-carrier and a modulation order, and the maximum number of resources is a maximum number of sub-carriers of the radio resource.

Wherein the step (b) comprises: calculating a value of an objective function by changing at least one of the number of subcarriers allocated to the bit expectation value and the modulation order, ; And reallocating the radio resource by changing at least one of the number of subcarriers and the modulation order allocated for the excess layer of the user group whose value of the calculated objective function is reduced most.

The value of the objective function is derived using the following equation,

는 할당받은 서브 캐리어의 수를 나타내고,

는 결정된 모듈레이션 값을 나타내며,

는 사용자 그룹의 총수를 나타내고,

는 사용자의 총 수를 나타내며,

는 계층(layer)의 총 수를 나타내고,

는 비트 기대값을 나타내고,

는 각 사용자 그룹의 인덱스를 나타내고,

는 각 사용자의 인덱스를 나타내며,

은 각 계층의 인덱스를 나타낸다.here,

Denotes the number of allocated subcarriers,

Represents the determined modulation value,

Represents the total number of user groups,

Represents the total number of users,

Represents the total number of layers,

Lt; / RTI > represents the expected bit value,

Represents the index of each user group,

Represents the index of each user,

Represents the index of each layer.

)로 나눈 것 이상의 주파수 사용의 효용성을 만족하도록 상기 목적함수의 값을 도출할 수 있다.Wherein the number of allocated subcarriers does not exceed the maximum number of resources of the radio resource, the modulation value of each layer of the user group is determined by a predetermined modulation combination,

), The value of the objective function can be derived so as to satisfy the utility of the frequency use.

In step (b), a radio resource may be allocated to maintain a predetermined target bit error rate (BER) of each layer for each user group before the maximum number of resources of the radio resources is exceeded.

The bit expectation value may be calculated using a result obtained by multiplying a bit number of a block by a probability of occurrence of a bit error in a slice of each layer and a probability of not generating a bit error in consideration of the importance of each layer and a user group .

The bit expected value is calculated using the following equation,

는 각 사용자 그룹의 인덱스를 나타내고,

은 각 계층(layer)의 인덱스를 나타내며,

은 각 계층별 슬라이스의 개수를 나타내고,

은 각 레이어별 블록의 개수를 나타낸다. 또한,

은 각 사용자 그룹에 대한 각 계층별 블록에 포함되는 비트수를 나타내고, m은 매크로블록 인덱스를 나타내며,

이고,

이며

이고,

는 g사용자 그룹의 k번째 사용자의

계층에 대한 비트 에러 확률을 나타내고, k는 사용자 인덱스를 나타내고, x(k)는 사용자(k)의 송신기로부터의 거리를 나타내며, i는 매크로 블록내의 비트 인덱스를 나타낸다.
here,

Represents the index of each user group,

Represents the index of each layer,

Represents the number of slices for each layer,

Represents the number of blocks for each layer. Also,

Represents the number of bits included in each layer block for each user group, m represents a macroblock index,

ego,

And

ego,

G is the number of the kth user in the g user group

K denotes a user index, x (k) denotes a distance from the transmitter of the user (k), and i denotes a bit index in a macroblock.

According to another aspect of the present invention, there is provided a radio resource allocation apparatus capable of allocating radio resources in accordance with characteristics of an image and equipment characteristics of a user group.

According to an embodiment of the present invention, there is provided a radio resource allocation apparatus comprising: a calculation unit calculating a bit expectation value using a bit error rate (BER) of each layer block for each user group; Represents each layer of scalable video coding (SVC); And allocating radio resources differentially from the base layer to the higher enhancement layer for each user group in a layer exceeding the maximum resource number of the radio resources using the bit expectation value And a radio resource allocating unit for allocating a radio resource to the radio resource allocating unit.

Wherein the radio resource assignment unit calculates the value of the objective function by changing at least one of the number of subcarriers allocated to the bit expectation value and the modulation order while reducing the excess layers of each user group one by one, The radio resource can be reallocated by reducing at least one of the number of subcarriers and the modulation order allocated for the excess layer of the user group whose value of the calculated objective function is reduced most.

The calculating unit may calculate the bit expectation value by using a result obtained by multiplying a bit number of a block by a probability that a bit error occurs in a slice of each layer and a probability that a bit error does not occur in consideration of importance, And may be differentially set for each layer and the user group.

The method and apparatus for allocating radio resources according to an embodiment of the present invention can allocate radio resources by reflecting characteristics of a video and equipment characteristics of a user group.

As described above, the present invention has an advantage of minimizing unnecessarily wasted radio resources by allocating radio resources in consideration of device characteristics and image characteristics of user groups.

1 is a flowchart illustrating a method of allocating radio resources in consideration of device characteristics and image characteristics of a user group according to an exemplary embodiment of the present invention;
2 illustrates a group of users for allocating radio resources according to an embodiment of the present invention;
FIG. 3 is a diagram for explaining radio resource allocation by user group in FIG. 2; FIG.
FIG. 4 illustrates a wireless resource allocation in consideration of device characteristics and image characteristics of a user group according to an embodiment of the present invention; FIG.
FIG. 5 is a block diagram schematically illustrating an internal configuration of a radio resource allocation apparatus according to an embodiment of the present invention; FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

The present invention can allocate radio resources to each user group in consideration of device characteristics and image characteristics (satisfaction) of a user group. According to an embodiment of the present invention, the radio resource allocation can allocate radio resources in consideration of scalable video coding (SVC) for each user group. SVC divides a video frame into several resolutions and encodes it. It consists of a base layer and a plurality of enhancement layers. The base layer contains low resolution pixel information for the video frame and requires additional information (i.e., enhancement layer) to reconstruct the video frame at higher resolution. The enhancement layer includes signals that can not be restored to the base layer, and the lower enhancement layer has a characteristic that it is the basis of the enhancement layer. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a flowchart illustrating a method of allocating radio resources in consideration of device characteristics and image characteristics of a user group according to an embodiment of the present invention. FIG. 2 is a flowchart illustrating a method of allocating a radio resource according to an embodiment of the present invention. FIG. 3 is a view for explaining a radio resource allocation according to a user group in FIG. 2, FIG. 4 is a diagram illustrating a device group characteristic and an image characteristic of a user group according to an exemplary embodiment of the present invention. In order to explain the radio resource allocation.

In step 110, the radio resource allocation apparatus 100 calculates a bit expectation value considering device characteristics and image characteristics for each user group.

In order to facilitate understanding and explanation, it is assumed that the wireless resource allocation apparatus 100 acquires display resolution information for each device included in each user group in advance and knows it. In addition, the device characteristic may represent display resolution information, and the image characteristic may represent each layer in multi-layer coding.

For example, the radio resource allocation apparatus 100 can calculate a bit expectation value considering device characteristics and image characteristics for each user group using the following equation (1).

는 각 사용자 그룹의 인덱스를 나타내고,

은 각 계층(layer)의 인덱스를 나타내며,

은 각 계층별 슬라이스의 개수를 나타내고,

은 각 레이어별 블록의 개수를 나타내고,

는 계층별-사용자 그룹별 중요도를 나타낸다. . 또한,

은 각 사용자 그룹에 대한 각 계층별 블록에 포함되는 비트수를 나타내고, m은 매크로 블록(macro-block) 인덱스를 나타내고, S는 슬라이스를 나타낸다.here,

Represents the index of each user group,

Represents the index of each layer,

Represents the number of slices for each layer,

Represents the number of blocks for each layer,

Represents the importance of each layer-user group. . Also,

Represents the number of bits included in each layer block for each user group, m represents a macro-block index, and S represents a slice.

은 e번째 슬라이스에서 비트 에러가 발생할 확률로, Also,

Is the probability that a bit error occurs in the e < th > slice,

이고,

은 슬라이스에서 비트 에러가 없을 확률로

과 같다.

ego,

Lt; RTI ID = 0.0 > bit error < / RTI >

Respectively.

은 블록의 비트에러율(BER: bit error rate)을 나타내며, 다음과 같다.

Represents the bit error rate (BER) of the block, as follows.

는 g사용자 그룹의 k번째 사용자의

계층에 대한 비트 에러 확률을 나타내고, k는 사용자 인덱스를 나타내며, x(k)는 사용자(k)의 송신기로부터의 거리를 나타내고, i는 매크로블록내의 비트 인덱스를 나타낸다. 또한,

는 e번째 슬라이스의 비트에러율을 나타내며, 다음과 같다.

here,

G is the number of the kth user in the g user group

K denotes a user index, x (k) denotes a distance from the transmitter of the user (k), and i denotes a bit index in a macroblock. Also,

Represents the bit error rate of the e < th > slice, as follows.

That is, the radio resource allocation apparatus 100 multiplies the number of bits included in each layer block for each user group with the probability of occurrence of an error and the probability that an error will not occur, and then calculates the importance (i.e., ) Can be finally multiplied to calculate the bit expected value.

For each layer-user group, the importance of the lower layer can be set to the maximum, and the importance can be set to different layers of the upper layer differentially. That is, the importance of the base layer can be set to the highest. In addition, the base layer in one embodiment of the present invention may be a bottom layer, the top layer " refers to the l order enhancement layer.

In addition, the importance of each layer-user group can be set differently for each user group. For example, since the display sizes of devices owned by the user are different for each user group, the importance levels can be set differently.

For example, if the number of users having a large display size of a device held by a user of a user group is high, the importance of the resource allocation is set high and if the number of users having a relatively small display size is relatively large, have.

In step 115, the radio resource allocation apparatus 100 allocates radio resources to each layer sequentially for each user group. Here, the radio resource may include at least one of, for example, the number of subcarriers to be allocated (bandwidth) and the modulation order.

For example, the radio resource allocation apparatus 100 allocates radio resources in order from the base layer to the higher enhancement layer including the most important information for each user group.

For example, assume that there are three user groups, as shown in FIG. The user of the first user group is in possession of a combination of the notebook, the tablet PC and the mobile communication terminal, the user of the second user group is in possession of the tablet PC and the mobile communication terminal in combination, It is assumed that only the communication terminal is possessed.

The resolution of an image that can be intuitively reproduced differs depending on the display size of the device held by the user. For example, referring to FIG. 3, it is assumed that a device possessed by a user is a mobile communication terminal. In the case of a mobile communication terminal, a resolution sufficient for reproducing an image is secured with only a base layer and a first enhancement layer, , It can be seen that there is no inconvenience in reproducing an image until the resolution up to the third enhancement layer is required. That is, in the case of a device having a large display size, it is necessary to minimize the visual inconvenience of a user and to relatively enhance the hierarchy to reproduce an image. On the other hand, in a device having a small display size, The image can be reproduced without visual inconvenience even with the enhancement layer alone.

Accordingly, when the radio resource allocation is not insufficient, the radio resource allocation apparatus 100 can allocate radio resources to each layer sequentially from the base layer to the higher enhancement layer for each user group.

In step 120, the radio resource allocation apparatus 100 determines whether the maximum number of resources of the radio resource is exceeded. Here, the maximum number of resources of the radio resources may be the maximum number of subcarriers of the radio resources (the maximum bandwidth of the radio resources).

If the maximum number of resources of the radio resource (for example, the maximum number of subcarriers (maximum bandwidth)) is not exceeded, the bandwidth of the radio resource is not insufficient, The radio resources are allocated in order from the base layer to the higher enhancement layer to allocate the radio resources to guarantee the normal image quality.

However, if the maximum number of radio resources is exceeded, the radio resource allocation apparatus 100 allocates radio resources differentially using the bit expectation value calculated in the layer exceeding the maximum number of radio resources .

More specifically, the radio resource allocation apparatus 100 decreases the bit expectation value by decreasing radio resources (for example, the number of allocated subcarriers and the number of modulation orders) for each user group one by one in the layer exceeding the maximum number of resources of the radio resources And the values of the objective function used can be respectively calculated.

Then, the radio resource allocation apparatus 100 can reduce the radio resources of the user group in which the value of the objective function is decreased most.

The radio resource allocation apparatus 100 can calculate the value of the objective function using the following equation (2).

At this time, the objective function must satisfy the following condition.

는 할당받는 서브 캐리어의 수를 나타내고,

는 결정된 모듈레이션 값을 나타내며,

는 사용자 그룹의 총수를 나타내고,

는 사용자의 총 수를 나타내며,

는 계층(layer)의 총 수를 나타내고,

는 비트 기대값을 나타내고,

는 각 사용자 그룹의 인덱스를 나타내고,

는 각 사용자의 인덱스를 나타내며,

은 각 계층의 인덱스를 나타낸다. 또한,

는 무선 자원의 최대값을 나타내고,

은 모듈레이션 차수를 나타내며,

은 계층을 실제로 받는 사용자 그룹을 나타내고,

는 심볼에 걸리는 비트의 수를 나타내며,

는 하나의 서브 캐리어(sub-carrier)의 대역폭을 나타내고,

은 서브 캐리어 하나에 보내야 하는 비트수를 나타낸다.Here,

Denotes the number of subcarriers to be allocated,

Represents the determined modulation value,

Represents the total number of user groups,

Represents the total number of users,

Represents the total number of layers,

Lt; / RTI > represents the expected bit value,

Represents the index of each user group,

Represents the index of each user,

Represents the index of each layer. Also,

Represents the maximum value of the radio resource,

Represents the modulation order,

Represents the user group actually receiving the layer,

Represents the number of bits that are placed on the symbol,

Represents the bandwidth of one sub-carrier,

Represents the number of bits to be sent to one subcarrier.

)를 초과하지 않아야 하며, 각 사용자 그룹의 각 계층에 대한 모듈레이션 차수(

)는 정해진 모듈레이션 조합(M)에서 결정되어야 한다. 또한, 목적함수의 주파수 사용에 대한 효율성은 서브 캐리어의 대역폭(

)으로 전송율(

)을 나눈 것 이상이 되어야 한다.That is, the objective function of the number 2 is the maximum number of bandwidths of the given radio resource (

), And the modulation order for each layer of each user group (

) Must be determined at a given modulation combination (M). In addition, the efficiency of the use of the frequency of the objective function depends on the bandwidth of the subcarrier (

) To the transmission rate

) Should be more than divided.

The radio resource is sequentially reduced for each user group in the layer exceeding the maximum number of radio resources so that the objective function for the bit expected value satisfying the above condition is maximized (i.e., the number of allocated subcarriers and the modulation order It is possible to reduce the radio resources of the user group in which the value of the objective function is decreased the most after the value of the objective function is calculated.

For example, it will be described in more detail with reference to FIG.

First, in the first radio resource allocation, the radio resource allocation apparatus 100 sequentially allocates radio resources for the base layer of each user group so as to be maintained at a predetermined level of a bit error rate (BER) or less.

As shown in 410 of FIG. 4, even if a base layer is assigned to each user group (i.e., a first user group, a second user group, and a third user group), the bandwidth of the radio resource is not exceeded, The allocating apparatus 100 sequentially allocates the radio resources of the base layer to each user group in order to ensure a normal image quality.

Next, the as shown in 420 of Figure 4, in turn, allocated the radio resources of the first enhancement layer (1 ^st enhancement layer) for each user group.

Since the bandwidth of the radio resource is not exceeded even after the first enhancement layer is allocated, the radio resource allocation apparatus 100 sequentially allocates the radio resources of the first enhancement layer to each user group Respectively.

Next, the radio resource assignment unit 100 assigns, as shown in 430 of Figure 4. For each user group, the radio resources of the second enhancement layer (enhancement layer 2 ^nd), respectively.

However, as shown in 430 of FIG. 4, when allocating radio resources for the second enhancement layer, it is assumed that a given bandwidth is exceeded.

In this case, the radio resource allocation apparatus 100 reduces the radio resources for each user group by sequentially reducing the radio resources of each user group in the second enhancement layer, which exceeds the maximum number of radio resources. To this end, the radio resource allocation apparatus 100 reduces the radio resources (i.e., at least one of the number of subcarriers to be allocated and the modulation order) of each user group in the second enhancement layer that exceeds the maximum number of radio resources And calculates the value of the objective function, respectively. At this time, the radio resource allocation apparatus 100 can reallocate radio resources while reducing the radio resources of the user group that reduces the value of the objective function to the greatest.

5 is a block diagram schematically illustrating an internal configuration of a radio resource allocation apparatus according to an embodiment of the present invention.

5, a radio resource allocation apparatus 100 according to an exemplary embodiment of the present invention includes a communication unit 510, a calculation unit 515, a radio resource allocation unit 520, a memory 525, and a control unit 530, .

The communication unit 510 is a means for transmitting and receiving data to and from other devices (for example, devices owned by users of each user group) via a wire / wireless communication network.

The calculation unit 515 is means for calculating the bit expectation value using the block bit error rate of each layer for each user group. Here, each layer represents each layer of the Multilayer Coding (SVC) as described above, and includes one base layer and a plurality of enhancement layers.

For example, the calculation unit 515 multiplies the number of bits included in each layer block for each user group with the probability that an error will occur and the probability that an error will not occur, and then calculates the importance (i.e., ) Can be finally multiplied to calculate each bit expected value. In addition, the importance of each layer-user group can be set to the maximum importance of the lower layer and the importance can be set to different layers of the different layers. That is, the importance of the base layer can be set to the highest.

Since the method of calculating the expected bit value itself is the same as that described above, duplicate description will be omitted.

The radio resource assignment unit 520 is a means for assigning radio resources in order from a base layer to an enhancement layer for each user group.

At this time, if there is not enough radio resources, the radio resource allocation unit 520 may allocate radio resources to each layer so as to guarantee a normal level of picture quality for each user group. However, if the number of radio resources is greater than the maximum number of resources of the radio resources during the allocation of radio resources from the base layer to the higher layer for each user group, the radio resource allocator 520 allocates the maximum number of radio resources It is possible to allocate the radio resources differentially using the bit expectation value in the exceeding layer.

In more detail, the radio resource allocator 520 may allocate radio resources for each layer of each user group so as to maintain a target bit error rate of each layer for each user group.

However, if the maximum number of resources of the radio resource is exceeded, the radio resource allocator 520 decreases the value of the objective function by one, decreasing the radio resource of each layer of each user group by one Thereby reducing the radio resources of the group.

That is, the radio resource assignment unit 520 calculates the value of the objective function by changing at least one of the number of subcarriers to be allocated to the bit expectation value and the modulation order, while sequentially reducing the excess layers of each user group . Then, the radio resource assignment unit 520 reduces radio resources using at least one of the number of subcarriers and the modulation order, which are changed in accordance with the excess layer of the user group whose value of the objective function is the largest, To allocate radio resources.

The memory 525 is a means for storing various information, algorithms and the like necessary for operating the radio resource allocation apparatus 100 according to an embodiment of the present invention.

The control unit 530 may be configured to control the internal components (for example, the communication unit 510, the calculation unit 515, the radio resource allocation unit 520, (525), etc.).

Meanwhile, a method of allocating radio resources using video or user group device information according to an embodiment of the present invention may be implemented in a form of a program command that can be performed through a variety of electronic information processing means, Lt; / RTI > The storage medium may include program instructions, data files, data structures, and the like, alone or in combination.

Program instructions to be recorded on the storage medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of software. Examples of storage media include magnetic media such as hard disks, floppy disks and magnetic tape, optical media such as CD-ROMs and DVDs, magneto-optical media such as floptical disks, magneto-optical media and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as devices for processing information electronically using an interpreter or the like, for example, a high-level language code that can be executed by a computer.

The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

100: radio resource allocation device
510:
515:
520: radio resource allocation unit
525: Memory
530:

Claims (12)

(a) calculating a bit expectation value using a bit error rate (BER) of a block of each layer for each user group, each of the layers comprising a plurality of layers of scalable video coding (SVC) Lt; / RTI > And
(b) allocating radio resources in order from a base layer to an upper enhancement layer for each user group, the layer exceeding the maximum resource number of the radio resources, The method comprising:
The bit expectation value is calculated by using the result of multiplying the bit number of the block by the probability that the bit error occurs in the slice of each layer and the probability that the bit error will not occur in consideration of the importance of each layer and the user group Assignment method. The method according to claim 1,
Wherein the radio resource is at least one of a sub-carrier and a modulation order,
Wherein the maximum number of resources is a maximum number of subcarriers of the radio resource. The method according to claim 1,
The step (b)
Calculating a value of an objective function by changing at least one of the number of subcarriers allocated to the bit expected value and the modulation order while decreasing the excess hierarchy of each user group one by one; And
And reallocating the radio resource by changing at least one of a number of subcarriers allocated to the excess layer of the user group and a modulation order of the user group whose value of the calculated objective function is decreased most, . The method of claim 3,
Wherein the value of the objective function is derived using the following equation.

here,

Denotes the number of allocated subcarriers,

Represents the determined modulation value,

Represents the total number of user groups,

Represents the total number of users,

Represents the total number of layers,

Lt; / RTI > represents the expected bit value,

Represents the index of each user group,

Represents the index of each user,

Represents the index of each layer. 5. The method of claim 4,
Wherein the number of allocated subcarriers does not exceed the maximum number of resources of the radio resource, the modulation value of each layer of the user group is determined by a predetermined modulation combination,

Wherein the value of the objective function is derived so as to satisfy the utility of frequency use more than the division of the objective function. The method according to claim 1,
And allocating a radio resource to maintain a bit error rate (BER) of less than a predetermined bit error rate for each user group before the maximum resource number of the radio resources is exceeded in the step (b) Radio resource allocation method.
delete The method according to claim 1,
Wherein the bit expected value is calculated using the following equation.

here,

Represents the index of each user group,

Represents the index of each layer,

Represents the number of slices for each layer,

Represents the number of blocks for each layer. Also,

Represents the number of bits included in each layer block for each user group, m represents a macroblock index,

ego,

And

ego,

G is the number of the kth user in the g user group

K denotes a user index, x (k) denotes a distance from a transmitter of a user (k), i denotes a bit index in a macroblock, S denotes a slice,

being. A recording medium product on which program codes for carrying out the method according to any one of claims 1 to 6 and 8 are recorded. A radio resource allocation apparatus comprising:
A calculation unit calculating a bit expected value using a bit error rate (BER) of a block of each layer for each user group, each of the layers including a layer for each layer of scalable video coding (SVC) Indicates; And
And allocating radio resources differentially in the layer exceeding the maximum number of resources of the radio resource during the allocation of radio resources from the base layer to the upper layer for each user group And a radio resource allocation unit for allocating radio resource allocation
The bit expectation value is calculated by using the result of multiplying the bit number of the block by the probability that the bit error occurs in the slice of each layer and the probability that the bit error will not occur in consideration of the importance of each layer and the user group Allocation device. 11. The method of claim 10,
Wherein the radio resource allocation unit comprises:
Calculating a value of an objective function by changing at least one of the number of subcarriers allocated to the bit expectation value and the modulation order while decreasing the excess hierarchy of each user group one by one,
And reallocates the radio resource by reducing at least one of a number of subcarriers allocated to the excess layer of the user group and a modulation order of the user group whose value of the calculated objective function is reduced most. . 11. The method of claim 10,
Wherein the priority is differentially set for each layer and the user group.

Images