KR101505680B1 - Method of transmitting data and allocating radio resource - Google Patents

Abstract

According to an embodiment of the present invention, there is provided a data transmission method including: receiving information on an allocated area on an uplink frame; and transmitting, in accordance with a hopping pattern within at least one of the plurality of inner blocks, And transmitting the uplink data through the inner block. It is possible to allocate radio resources in an area advantageous to the UE.

Wireless communication, multiple access.

Description

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

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to wireless communication, and more particularly, to a wireless resource allocation method according to a multiple access scheme in a wireless communication system.

Wireless communication systems are widely used to provide various types of communication. For example, voice and / or data is being provided by a wireless communication system. A typical wireless communication system provides one or more shared resources to multiple users. For example, a wireless communication system may use various multiple access schemes such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), and Frequency Division Multiple Access (FDMA).

Orthogonal Frequency Division Multiplexing (OFDM) uses a plurality of orthogonal subcarriers. OFDM uses the orthogonal property between IFFT (inverse fast Fourier transform) and FFT (fast Fourier transform). In the transmitter, data is transmitted by performing IFFT. The receiver performs an FFT on the received signal to recover the original data. The transmitter uses an IFFT to combine multiple subcarriers, and the receiver uses a corresponding FFT to separate multiple subcarriers.

OFDM can reduce the complexity of a receiver in a frequency selective fading environment of a wideband channel and improve the spectral efficiency through selective scheduling in the frequency domain by utilizing different channel characteristics between subcarriers . Orthogonal Frequency Division Multiple Access (OFDMA) is a multiple access method based on OFDM. According to OFDMA, the efficiency of radio resources can be improved by allocating different subcarriers to multiple users.

A wireless communication system employs one or more base stations that provide coverage areas. A typical base station may transmit multiple data streams for broadcast, multicast and / or unicast services. A data stream is a stream of data that the terminal can independently receive. Also, the terminal may transmit a data stream to the base station or another terminal.

Hereinafter, downlink refers to communication from a base station to a terminal, and uplink refers to communication from a terminal to a base station.

In general, a base station schedules radio resources. The radio resource becomes an uplink resource in the uplink and a downlink resource in the downlink. In the downlink, the base station informs the downlink resource allocated to the data stream, and the terminal receives the data stream through the downlink resource. In the uplink, the BS informs the MS of the allocated uplink resource, and the MS transmits the data stream through the uplink resource.

The amount of the data stream to be transmitted, and the size of the radio resource allocated according to the channel state or Quality of Service (Qos) may vary. If the amount of data stream is large, many radio resources should be allocated. However, since the size of radio resources is finite, radio resources should be efficiently allocated.

In the case of allocating resources according to the scheduling-based scheme, since there is no interference between each user, the number of users that can be accommodated is limited, and there is a problem in that it is not suitable for a service that requires low-speed data transmission in real time. Therefore, the present invention proposes a frequency hopping radio resource allocation method according to the multiple access scheme.

However, when resources are allocated according to the random frequency hopping scheme, high spectral efficiency can not be obtained because channel conditions are not taken into consideration. Accordingly, the present invention provides a radio resource allocation method capable of providing a higher spectrum efficiency to a larger number of users.

According to an aspect of the present invention, there is provided a method of transmitting data in a wireless communication system, the method comprising: receiving information on an allocated area on an uplink frame; And transmitting the uplink data through at least one inner block among the plurality of inner blocks.

According to another aspect of the present invention, there is provided a method of allocating radio resources in a wireless communication system, the method comprising: receiving a channel state from terminals in a cell; and allocating an allocation region for data transmission on a frame in consideration of the channel state , The allocation area is divided into a plurality of inner blocks, and data is transmitted or received through at least one inner block of the plurality of inner blocks according to a hopping pattern in the allocation area.

According to the radio resource allocation scheme and the data transmission scheme according to the present invention, the state of the UE and the channel can be considered as compared with the conventional random frequency hopping scheme, so that the channel gain can be obtained. It also shows a performance improvement effect in the frame error rate (FER) and the like. On the other hand, since the collision probability is not increased as compared with the existing radio resource allocation method or the data transmission method, the performance degradation due to the increase in collision probability is not caused.

1 is a block diagram illustrating a wireless communication system. Wireless communication systems are widely deployed to provide various communication services such as voice, packet data, and the like.

Referring to FIG. 1, a wireless communication system includes a user equipment (UE) 10 and a base station (BS) 20. The terminal 10 may be fixed or mobile and may be referred to by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device, The base station 20 generally refers to a fixed station that communicates with the terminal 10 and may be referred to in other terms such as a Node-B, a Base Transceiver System (BTS), an Access Point Can be called. One base station 20 may have more than one cell.

There are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), and Orthogonal Frequency Division Multiple Access (OFDMA). For clarity, an OFDMA based wireless communication system will be described below.

The present invention can be applied to uplink transmission or downlink transmission. Hereinafter, a frame is an uplink frame in the uplink transmission and a downlink frame in the downlink transmission. The frame may include an uplink frame and a downlink frame. A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

Fig. 2 shows an example of a frame.

Referring to FIG. 2, one frame of the frame represents an OFDMA symbol index in the time domain, and the other axis represents a subchannel index in the frequency domain. A subchannel includes a plurality of subcarriers. A frame includes a plurality of OFDMA symbols in the time domain and a plurality of subchannels in the frequency domain. Transmission Time Interval (TTI) is the time required to transmit one frame.

One frame includes N + 1 OFDMA symbols and K + 1 subchannels (N and K are arbitrary natural numbers), but there is no limitation on the number of OFDMA symbols and the number of subchannels. The OFDMA index and subchannel index can also be varied in various ways.

That is, when a radio resource is allocated on the frame shown in FIG. 2, the radio resource allocation information includes the number and offset of the unit radio resources constituting the frame, and the terminal allocates radio resources allocated to the terminal through the radio resource allocation information Able to know. The offset is a value indicating the location of the radio resource allocated to the UE.

 Examples of radio resource allocation information for allocating radio resources to the UE are shown in Table 1 below.

Name Number of bits Description OFDMA symbol offset 8 Offset from start symbol of frame Subchannel offset 7 Offser from start subchannel of frame Number of OFDMA symbols 7 - Number of subchannels 7 - Reserved 3 -

The OFDMA symbol offset represents an OFDMA symbol index at which allocation starts, a subchannel offset represents a subchannel index at which allocation starts, the number of OFDMA symbols represents the number of assigned OFDMA symbols, Indicates the number of channels. The names and bit numbers shown in Table 1 are merely examples, and are not intended to limit the scope of the present invention. The name and the number of bits may be varied according to the system.

A unit radio resource having a predetermined size is defined in advance and the number and offset of the unit radio resources are generated as radio resource allocation information and transmitted to the mobile station. The radio resource can be allocated to the mobile station in an arbitrary position and an arbitrary size within one frame through the number and offset of the unit radio resources. It can be said that the degree of freedom of radio resource allocation is high. It is possible to flexibly allocate radio resources according to the size of radio resources required for the terminal. However, according to this method, the size of the radio resource allocation information increases. In the example of Table 1, at least 32 bits of radio resource allocation information are needed to indicate one assigned radio resource.

Hereinafter, a region in which a radio resource is allocated to a terminal in a frame is referred to as an allocation region A1. The size or position of the allocation area A1 is only an example. The allocation area A1 may be represented by the number and offset of resource elements as a set of resource elements including at least one resource element. The allocation area A1 according to an example includes 24 resource elements and the use of the expression in Table 1 results in "OFDMA symbol offset = 2, Subchannel offset = 3, Number of OFDMA symbols = 4, Number of subchannels = 6" .

3 is a flowchart illustrating a radio resource allocation method using a scheduling method.

Referring to FIG. 3, in order to allocate a radio resource to a terminal, the base station receives a resource allocation request from the terminal (S310). And also receives information on resources and channel status of terminals. The base station schedules and allocates radio resources to the mobile station in response to the request of the mobile station in step S320. That is, the base station allocates radio resources to the mobile stations by a scheduling method.

In this way, the scheduling-based radio resource allocation method is basically a method in which a mobile station transmits a radio resource allocation request to a base station and a base station allocates radio resources to the mobile station according to the scheduling of the base station. For example, according to the scheduling-based scheme, a base station allocates radio resources advantageous to each user terminal at the time of transmission of each frame.

4 to 6 are diagrams illustrating a radio resource allocation method in a hopping-based scheme.

FIG. 4 shows a hopping-based radio resource allocation scheme.

The base station allows multiple connections from terminals 401, 402, 403, ..., 406 to provide wireless communication services to a plurality of terminals 401, 402, 403, ..., 406. The plurality of terminals 401, 402, 403, ..., and 406 are each configured to hop between a plurality of orthogonal wireless communication resources (hereinafter referred to as 'orthogonal resources') arranged in a predetermined pattern with time hopping. Here, the terminals 401, 402, 403, ..., and 406 are referred to as a first terminal 401, a second terminal 402, a third terminal 403, and the like. FIG. 4 illustrates a hopping pattern using an orthogonal code, which is an example of orthogonal resources.

Different hopping patterns 411 to 416 are assigned to the terminals 410 to 406, respectively. Each of the hopping patterns 411 to 416 includes a plurality of orthogonal codes allocated in units of time slots of length Ts. For example, in the (n + 2) th time slot 421 of the first terminal 401, the seventh orthogonal code "OC # 7" Quot; OC # 11 ", which is an 11th orthogonal code, Each of the terminals 401 to 406 jumps between a plurality of orthogonal codes arranged in units of time slots and transmits data symbols to the terminal using the orthogonal code assigned to each time slot.

The " hopping " between orthogonal codes means that instead of transmitting a plurality of data symbols continuously using one fixed orthogonal code, the orthogonal code used for transmitting the data symbols may be orthogonalized by using different orthogonal codes included in the hopping pattern And each time slot is converted into a code. The meaning of this 'leap' also applies to the jump between various types of orthogonal resources such as orthogonal frequency resources and orthogonal time resources described below.

Since the orthogonality between different orthogonal codes is ensured, the base station can detect data symbols simultaneously transmitted from different terminals 401 to 406 using different orthogonal codes. However, for example, the 11th orthogonal code "OC # 11" is commonly assigned to the (n + 2) th time slot 421 included in the hopping pattern between the third terminal 403 and the fifth terminal 405, It is assumed that the seventh orthogonal code "OC # 7" is assigned to the (n + 4) th time slot 422 of the hopping pattern of the fifth terminal 405 and the sixth terminal 406, respectively. When two different terminals (the third terminal 403 and the fifth terminal 405) transmit data symbols using the same orthogonal code in the same time slot, the data symbols received by the base station can not be detected .

Such a situation is called a hopping pattern collision. The third terminal 403 and the fifth terminal 405 in the (n + 2) th time slot 421 and the fifth terminal 405 in the (n + 4) The first terminal 405 and the sixth terminal 406 are referred to as 'collided stations'.

The hopping pattern collision occurs between the terminals 401, 403, 405, and 406 that are actually transmitting data, that is, the terminals 401, 403, 405, and 406 in an active state, and are not active for data transmission 402, 404) are indicated by dotted lines.

For example, in the (n + 3) -th time slot, a 12th orthogonal code "OC # 12" is commonly assigned to the hopping patterns of the fourth terminal 404 and the fifth terminal 405, The base station can detect the data symbol transmitted from the fifth terminal 405 without collision because the base station 404 is not activated for data transmission, that is, in the inactive state. The same is true for the first terminal 401 and the second terminal 402 using the 14th orthogonal code "OC # 14" in the (n + 6) th time slot in common.

The orthogonal code is a code sequence having orthogonality generally used in a spread spectrum system, and typical examples thereof include a Walsh code and a PN code (pseudo-noise code). In FIG. 4, an orthogonal code is used as an example of the orthogonal resource. However, the hopping pattern of the present invention can be configured by arranging orthogonal frequency resources or orthogonal time resources in addition to orthogonal code resources.

The orthogonal frequency resource means a subcarrier set of the same kind as that applied to an orthogonal frequency division multiple access (OFDMA) system and guaranteed mutually orthogonal. In addition, the orthogonal time resource may include a bitmap indicating whether or not to use a plurality of sub time slots further subdivided into time slots. (+1, +1, +1, +1), (+1, +1, -1, -1), (+1, -1, -1, 1), (+1, -1, +1, -1).

5 is a flowchart illustrating a radio resource allocation and a data transmission method according to a hopping-based scheme.

According to FIG. 5, the terminal generates an orthogonal resource hopping pattern (S510). A hopping pattern is generated by arranging a plurality of orthogonal resources such as orthogonal frequency resources, orthogonal code resources, or orthogonal time resources according to time. Alternatively, a hopping pattern may be generated by combining two or more types of orthogonal resources.

A transmission signal is generated by mapping data symbols to orthogonal resources allocated to specific time slots of the hopping pattern (S520). If the orthogonal resource used is an orthogonal frequency resource, the symbol mapping process may include mapping a modulation sequence of the data symbol to a subcarrier set. If the orthogonal resource is an orthogonal code resource, the symbol mapping process may include spreading a data symbol using an orthogonal code.

And transmits the transmission signal to the base station through the uplink channel (S530). Only a terminal activated for data transmission, that is, a terminal whose corresponding radio channel is in an active state, transmits a transmission signal to the base station.

6 illustrates a configuration of an orthogonal resource block according to a hopping-based radio resource allocation.

6, the orthogonal resource block, which is a basic unit of hopping, is composed of 12 contiguous subcarriers along the frequency axis and 5 orthogonal frequency division multiplexing (OFDM) symbols adjacent to each other along the time axis. Four consecutive subcarriers are assigned to pilot symbols at four corners of the orthogonal resource block.

Up to four UEs can be allocated to one orthogonal resource block. That is, if there are four terminals a, b, c, and d, the terminal a maps the pilot symbol to the leftmost resource 601 of the orthogonal resource block. In the same manner, the remaining three terminals b, c, and d respectively map the pilot symbols to the resources 602, 603, and 604 of the orthogonal resource block. Thus, the orthogonal resource block can accommodate pilot symbols for up to four UEs without interference.

The pilot symbol is used for channel estimation in the base station. When a neighboring orthogonal resource is grouped to form a hopping pattern for each orthogonal resource block and only a part of orthogonal resources included in the orthogonal resource block is allocated to a pilot symbol, a considerable amount of The signaling can be removed to reduce the pilot overhead and simplify the data transmission process.

Since the orthogonal resource hopping pattern generation method of the orthogonal resource block unit is similar in channel characteristics between adjacent orthogonal resources, even if a pilot symbol is mapped to only a part of orthogonal resources included in the orthogonal resource block, The estimation performance of the first embodiment is not significantly deteriorated.

7 to 9 are diagrams illustrating a radio resource allocation and a data transmission method according to an embodiment of the present invention.

The present invention relates to a method of allocating radio resources in a hybrid multiple access, wherein a hybrid multiple access scheme is a resource allocation scheme utilizing an OFDMA system to be used in a next generation mobile communication. The multiple access scheme means a rule for cooperative use of a given band by a plurality of users. The entire communication channel can be divided into subchannels, which are assigned to the terminals of the respective users. Usually the number of users is greater than the number of allowed subchannels, and only a few of the users have data to transmit in a certain time period. Therefore, users with data to be transmitted should be able to utilize radio resources efficiently.

However, in order for a terminal of a user to succeed in transmitting data or signals according to the characteristics of wireless communication, it is necessary to consider data transmission of another user terminal. In other words, data transmission can be successful if interference with another user's terminal can be controlled or avoided. Multiple simultaneous wireless transmissions can cause collisions or distort the signal. Therefore, an efficient resource allocation scheme is required for a multiple access protocol.

The resource allocation schemes that can be used in the hybrid multiple access scheme include the scheduling based scheme described with reference to FIG. 3, the hopping based scheme described with reference to FIGS. 4 to 6, and the collision based scheme. In the present invention, the hybrid radio resource allocation method is a combination of a scheduling-based radio resource allocation scheme and a hop-based radio resource allocation scheme.

The scheduling based scheme allocates a frequency resource advantageous to each user terminal at each transmission of a frame, whereas the hopping based scheme uses a hopping pattern known in advance between data transmission and reception prior to data transmission, and overhead. In addition, the scheduling-based scheme does not cause interference by separating resources among other users, but using a statistical characteristic that the user does not always use resources, The user can be accommodated. The leap-based approach can accommodate more users, while conflicts arise because the exclusive use of resources is not guaranteed.

In addition, the scheduling-based scheme is complicated because the resource advantageous to each user must be efficiently allocated without interfering with each other. On the other hand, the hopping based scheme allocates resources irrespective of the channel information, so that high spectral efficiency can not be obtained in a frequency selective fading environment.

Embodiments of the present invention will be described below with reference to a method in which a base station allocates radio resources to a mobile station by collecting the advantages of the scheduling-based scheme and the hopping-based scheme described above, and a method in which a mobile station transmits data using radio resources allocated in this manner do.

7 is a flowchart illustrating a method of allocating radio resources according to an embodiment of the present invention.

The base station receives information on the channel status from the terminals in the cell (S710). Information about the channel state is required for the base station to allocate a region of radio resources advantageous to the terminal to the terminal as an allocation region.

The base station allocates an allocation region, which is a partial region, to the terminal in the frame (S720). Here, a scheduling-based radio resource allocation scheme is used to allocate an allocation region to a UE.

That is, the base station can use the channel information to allocate the allocated area. The channel information is received from the terminal. In this case, the base station selects and allocates a radio resource having a frequency or a time advantageous to the UE according to the state of the UE and the channel, as an allocation region.

That is, the allocation region is selected as an area advantageous to the user terminal according to the scheduling-based radio resource allocation scheme. The advantageous area for the user is determined in consideration of the channel state, the channel gain, and the amount of traffic between the user and the base station. Channel information such as a channel quality indicator (CQI) transmitted from a terminal may be used for the base station to determine the allocated area. For example, the base station can determine which region is advantageous to the user terminal by using channel gain information for each frequency of each user.

In an embodiment of the present invention, a BS specifies an allocation region corresponding to a channel state for each UE and allocates the allocation region to each UE. Then, the UE transmits data to or receives data from the BS through one or more inner blocks in the allocated region . The BS allocates an allocation region suitable for each MS, and the MS uses only the radio resources in the allocated region in data transmission, thereby improving the problem caused by the random hopping scheme.

According to the existing random-leap-based scheme, the UE has a low channel gain or a radio resource of a disadvantageous area to the UE. However, according to the embodiment of the present invention, There is no such concern because the inner block is used only in the allocation region which is a radio resource region advantageous for transmission.

Radio resources orthogonal to each other are allocated to the respective internal blocks. Accordingly, even if the UEs transmit data at the same time, they use radio resources that are orthogonal to each other, so that the transmitted data is prevented from being deformed or lost due to data transmission of other UEs.

In addition, if data is transmitted using the inner blocks in turn, the terminals will utilize wireless resources of different areas in a leaps and bounds. Here, the jump of the radio resource depends on the hopping pattern. The jump pattern can be variously modified. According to an example, considering the channel gains of the respective inner blocks, the inner blocks can be leased according to the order favorable to the terminal. According to another embodiment, the hopping pattern may be a plurality of inner blocks arranged according to a TTI (Transmission Time Interval).

The information on the channel state transmitted to the base station by the terminal is also used for determining the allocation region of each terminal, but can also be used for determining the hopping pattern of the inner block. The terminal transmits uplink data through each inner block according to a hopping pattern in an allocation region suitable for the channel state (S730).

FIG. 8 is a flowchart illustrating a method for transmitting uplink data by a terminal using radio resources allocated from a base station by the method of FIG. 7. Referring to FIG.

First, the terminal receives information on the allocated area from the base station (S810). That is, when the terminal receives the information on the allocation area, the terminal transmits the data through the radio resource in the allocation area. The allocation area is composed of a plurality of inner blocks as described above. When the terminal uses the radio resources in the allocation area, it means that uplink data is transmitted through some or all of the inner blocks constituting the allocation area allocated by the terminal.

The UE can transmit information on the channel state to be allocated a favorable allocation area. The BS may receive channel state information of the UEs, but a dedicated receiver for receiving channel state information may be provided, and the UE may receive channel state information for each UE and output the received channel state information to the BS.

The terminal transmits the uplink data through the inner block in the allocation area (S820). When a terminal transmits data through one or more inner blocks, the wireless resource leaps to the time axis or the frequency axis.

The terminal transmits data through a plurality of inner blocks according to the hopping pattern, and the hopping pattern and the determination method thereof are described with reference to FIG. 7, and a description thereof will be omitted.

9 is a diagram illustrating a hopping pattern of radio resources according to an embodiment of the present invention.

The allocation area 900 includes a plurality of inner blocks 901, 902, 903, 904, 905, and 906. The terminal alternately jumps to each of the inner blocks so that the inner blocks 901, 902, 903, 904, 905, and 906, respectively. Therefore, according to the embodiment of the present invention, when the UE transmits data through the inner blocks 901, 902, 903, 904, 905, and 906, the data to be transmitted is transmitted through the uplink data.

Referring to FIG. 9, the UE transmits data through internal blocks 901, 902, 903, 904, 905, and 906 having different frequency and time domains. In the embodiment shown in FIG. 9, the order of internal blocks used for data transmission is' 901? 902? 903? 904? 905? 906 '. In this case, data is transmitted using radio resources according to a frequency hopping allocation scheme.

However, the order of the inner blocks 901, 902, 903, 904, 905, and 906, that is, the hopping pattern is not necessarily determined by the frequency hopping method, and the hopping pattern can be determined in various ways. The hopping pattern may be determined in real time considering the channel state or the channel gain, or there may be a hopping pattern predetermined between the terminal and the base station. FIG. 8 is merely an example for explaining that a terminal transmits data while jumping radio resources using internal blocks on a frame according to an embodiment of the present invention.

10 is a graph showing radio resources allocated according to a conventional random hopping scheme. 11 is a graph illustrating a comparison between the radio resources allocated by the allocation scheme according to the embodiment of the present invention and the case of the conventional random frequency hopping scheme. Hereinafter, a radio resource allocation scheme according to an embodiment of the present invention is referred to as an adaptive hopping scheme.

In order to improve system performance, it is desirable that radio resources are allocated in a region where signal power is high. Referring to FIG. 10, when a radio resource is allocated according to a random frequency hopping scheme, a radio resource is allocated irrespective of a state of a UE or a channel, so that a radio resource is allocated in an interval in which signal strength is poor.

On the other hand, referring to FIG. 11, radio resources are allocated according to the adaptive frequency hopping scheme. Compared with the random frequency hopping scheme, the allocated radio resources are located at a point where signal strength is high. Even if the frequency hopping scheme is used, the radio resources are allocated in consideration of the state of the UE or the channel, so that the radio resources are allocated in a higher signal intensity interval.

12 and 13 are graphs comparing performance of a random frequency hopping scheme and an adaptive frequency hopping scheme. And performance when data and the like are transmitted through various channels having different collision rates (CRs). FIG. 12 illustrates a case where a single receiving antenna is used in a single-input and a single-output (SISO) system in each user terminal, and FIG. Is a graph showing a frame error rate according to a bit energy vs. noise power ratio. The graph x axis is the bit energy to noise power ratio (Eb / N0) and the y axis is the frame error rate (FER). The unit of bit energy to noise power ratio is decibel (dB).

Referring to FIG. 12, when the collision probability is 0.1, if the random frequency hopping scheme is used to have the same frame error rate, the bit energy to noise power ratio should be increased by about 4 to 5 dB as compared with the case of using the adaptive frequency hopping scheme . That is, when the collision probability is 0.1, there is a power difference of about 5 dB between the random frequency hopping scheme and the adaptive frequency hopping scheme.

 Also, if the collision probability is 0.3, in order to have the same frame error rate, the random frequency hopping scheme should increase the noise power ratio to bit energy by about 5 ~ 6dB compared with the adaptive frequency hopping scheme. If the collision probability is 0.5, if the frequency hopping scheme is used to have the same frame error rate, the bit energy to noise power ratio should be increased by about 6 dB or more as compared with the adaptive frequency hopping scheme.

 Referring to FIG. 13, when the collision probability is 0.1, when the random frequency hopping scheme is used to have the same frame error rate, the bit energy to noise power ratio should be increased by about 4 dB as compared with the adaptive frequency hopping scheme. That is, when the collision probability is 0.1, there is a power difference of about 4 dB between the random frequency hopping scheme and the adaptive frequency hopping scheme.

 Also, when the probability of collision is 0.3, when the random frequency hopping scheme is used in order to have the same frame error rate, the bit energy to noise power ratio should be increased by about 4 dB as compared with the adaptive frequency hopping scheme. When the collision probability is 0.5, if the frequency hopping scheme is used to have the same frame error rate, the ratio of bit energy to noise power should be increased by about 5 dB compared with the adaptive frequency hopping scheme.

The present invention may be implemented in hardware, software, or a combination thereof. (DSP), a programmable logic device (PLD), a field programmable gate array (FPGA), a processor, a controller, a microprocessor, and the like, which are designed to perform the above- , Other electronic units, or a combination thereof. In software implementation, it may be implemented as a module that performs the above-described functions. The software may be stored in a memory unit and executed by a processor. The memory unit or processor may employ various means well known to those skilled in the art.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention. You will understand. Therefore, it is intended that the present invention covers all embodiments falling within the scope of the following claims, rather than being limited to the above-described embodiments.

1 is a block diagram illustrating a wireless communication system;

2 is a diagram showing an example of a frame;

3 is a flowchart illustrating a radio resource allocation method using a scheduling method.

4 is a diagram illustrating a hopping-based radio resource allocation scheme;

5 is a flowchart illustrating a radio resource allocation and a data transmission method according to a hopping-based scheme;

6 is a diagram illustrating a configuration of an orthogonal resource block according to a jump-based radio resource allocation;

7 is a flow diagram illustrating a method for allocating radio resources according to an embodiment of the present invention.

FIG. 8 is a flowchart illustrating a method for transmitting uplink data by a UE using a radio resource allocated from a Node B by the method of FIG. 7. FIG.

9 is a diagram illustrating a hopping pattern of radio resources according to an embodiment of the present invention.

10 is a graphical representation of radio resources allocated according to a conventional random hopping scheme;

FIG. 11 is a graph showing radio resources allocated according to an adaptive hopping scheme, which is a scheme according to an embodiment of the present invention, in contrast to a case of a conventional random frequency hopping scheme.

12 and 13 are graphs comparing the performance of a random frequency hopping scheme and an adaptive frequency hopping scheme.

Claims (9)

A method for transmitting data in a wireless communication system, Comprising: receiving information on a first allocation area located on a UL frame; And Transmitting uplink data through at least one inner block within the first allocation area according to a hopping pattern in the allocation area including a plurality of inner blocks, Wherein the first allocation region is not overlapped with a second allocation region allocated exclusively to the terminal and allocated to another terminal, and the information on the first allocation region is based on a state of a radio resource. The method according to claim 1, Wherein the base station allocates the first allocation area in consideration of a channel state between the base station and the terminal. 3. The method of claim 2, And transmitting information about the channel status. The method according to claim 1, Wherein the hopping pattern includes the plurality of inner blocks arranged according to a transmission time interval (TTI). The method according to claim 1, Wherein orthogonal resources orthogonal to each terminal are allocated to the plurality of internal blocks. A method for allocating radio resources in a wireless communication system, Receiving a channel state from terminals in a cell; And Allocating a first allocation region for data transmission on a frame in consideration of the channel state, Data is transmitted or received through at least one inner block within the first allocation area according to a hopping pattern in the first allocation area including a plurality of inner blocks, Wherein the first allocation region is not overlapped with a second allocation region allocated exclusively to the UE and allocated to another UE. The method according to claim 6, And transmitting information about the first allocation region. The method according to claim 6, Wherein the hopping pattern includes the plurality of inner blocks arranged according to a TTI. The method according to claim 6, Wherein orthogonal resources orthogonal to each terminal are allocated to the plurality of inner blocks.

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