KR101208539B1 - Method For Multiplexing Frequency Hopping User Signal And Scheduled User Signal, And Method For Transmitting Signal With The Same - Google Patents

Abstract

The present invention relates to a multiplexing method of a frequency hopping user signal and a scheduling user signal and a signal transmission method using the same. According to the present invention, it is possible to reduce the probability of collision between each other by distinguishing frequency bands used by UEs using frequency hopping and UEs using scheduling, and sharing resources among users using frequency hopping more efficiently. Can be used as

Frequency hopping, scheduling

Description

Method for Multiplexing Frequency Hopping User Signal And Scheduled User Signal, And Method For Transmitting Signal With The Same}

1 is a diagram illustrating a structure of a transmitting end of a DFT-S-OFDM scheme.

2 conceptually illustrates an example of applying HARQ.

3 is a diagram illustrating an example of a data transmission band change pattern according to a frequency hopping scheme.

4 is a diagram for explaining an example in which frequency hopping and frequency scheduling are simultaneously performed according to one embodiment of the present invention;

5A illustrates an example of determining a hopping pattern such that a frequency hopping region is shared by a plurality of users when frequency hopping and frequency scheduling are simultaneously performed according to an embodiment of the present invention.

FIG. 5B illustrates an example in which a data transmission frequency band of each user is changed upon retransmission in a frequency hopping region when frequency hopping and frequency scheduling are simultaneously performed according to an embodiment of the present invention. FIG.

FIG. 6A illustrates an example in which pilots of a user using frequency hopping are distributed and transmitted over the entire frequency band to which each user applies frequency hopping in accordance with an embodiment of the present invention. FIG.

FIG. 6B illustrates an example of transmitting pilots of a user using frequency hopping distributed throughout the frequency domain for users using frequency hopping in accordance with one embodiment of the present invention. FIG.

7 is a flowchart illustrating a method of dividing and multiplexing a frequency domain according to an embodiment of the present invention.

8 is a flowchart illustrating a signal transmission method of a user equipment for transmitting data through scheduling according to an embodiment of the present invention;

9 is a flowchart illustrating a signal transmission method of a user equipment for transmitting data through frequency hopping according to an embodiment of the present invention.

The present invention relates to a wireless communication technology, and more particularly, to a multiplexing method of a frequency hopping user signal and a scheduling user signal and a signal transmission method using the same.

First, orthogonal frequency division multiplexing (OFDM) according to the prior art will be described. The basic principle of OFDM is to divide a high-rate data stream into a large number of low-rate data streams and transmit them simultaneously using multiple carriers. Each of the plurality of carriers is called a subcarrier. Since orthogonality exists between the multiple carriers of the OFDM, the frequency components of the carriers can be detected at the receiving end even if they overlap each other. The high data rate data stream is converted into a plurality of low data rate data streams through a serial to parallel converter, and each subcarrier is included in the parallel data streams. After multiplying, the respective data strings are summed and sent to the receiving end.

A plurality of parallel data streams generated by the serial / parallel transform unit may be transmitted to a plurality of subcarriers by an inverse discrete fourier transform (IDFT), and the IDFT is an inverse fast fourier transform (IFFT). Can be implemented efficiently.

Since the symbol duration of the low carrier subcarrier is increased, relative signal dispersion in time caused by multipath delay spread is reduced. Inter-symbol interference can be reduced by inserting a guard interval longer than the delay spread of the channel between OFDM symbols. If a part of the OFDM signal is copied and arranged in such a guard period, the OFDM symbol may be cyclically extended to protect the symbol.

Hereinafter, orthogonal frequency division multiple access (OFDMA) according to the prior art will be described. OFDMA refers to a multiple access method for realizing multiple access by providing each user with a part of subcarriers available in a system using OFDM as a modulation method. OFDMA provides frequency resources called subcarriers to each user, and each frequency resource is provided to a plurality of users independently of each other so that they do not overlap each other. After all, frequency resources are allocated mutually exclusive.

Hereinafter, the conventional DFT-S-OFDM scheme will be described. The DFT-S-OFDM scheme is also called Single Carrier-FDMA (SC-FDMA). Conventional SC-FDMA technique is a technique that is mainly applied to uplink. Before generating an OFDM signal, spreading is first applied to a DFT matrix in a frequency domain, and then the result is modulated by a conventional OFDM scheme and transmitted. .

1 is a diagram illustrating a structure of a transmitting end of a DFT-S-OFDM scheme.

Several variables are defined to describe the operation of the conventional device. N denotes the number of subcarriers transmitting the OFDM signal, Nb denotes the number of subcarriers for any user, F denotes a discrete Fourier transform matrix, or DFT matrix, s denotes a data symbol vector, x Denotes a vector in which data is distributed in the frequency domain, and y denotes an OFDM symbol vector transmitted in the time domain.

In SC-FDMA, the data symbol s is converted into a parallel signal by the serial / parallel conversion unit 110 and distributed using a DFT matrix before the data symbol s is transmitted by the DFT spreading module 120. . This is expressed by the following formula.

는, 데이터 심볼(s)을 분산시키기 위해서 사용된 Nb 크기의 DFT 행렬이다. 이렇게 분산된 벡터(x)에 대하여 부반송파 매핑부(130)에서 일정한 부 반송파 할당 기법에 의해 부 반송파 매핑(subcarrier mapping)이 수행되고, IDFT 모듈(140)에 의해 시간영역으로 변환되어 병/직렬 변환부(150)를 거쳐 수신 측으로 전송하고자 하는 신호가 얻어진다. 상기 수신 측으로 전송되는 전송신호는 아래 식과 같다. In Equation (1)

Is an Nb-sized DFT matrix used to disperse the data symbols s. Subcarrier mapping is performed in the subcarrier mapping unit 130 using a predetermined subcarrier allocation scheme for the distributed vector x, and the IDFT module 140 converts the subcarrier into a time domain to perform parallel / serial conversion. The signal to be transmitted to the receiving side is obtained through the unit 150. The transmission signal transmitted to the receiving side is as follows.

는 주파수 영역의 신호를 시간 영역의 신호로 변환하기 위해 사용되는 크기 N의 IDFT 행렬이다. 상술한 방법에 의해 생성된 신호 y는, 순환 전치 삽입부(160)에 의해 순환 전치(cyclic prefix)가 삽입되어 전송된다. 상술한 방법에 의해 전송 신호를 생성하여 수신 측으로 전송하는 방법을 SC-FDMA 방법이라 한다. DFT 행렬의 크기는 특정한 목적을 위해 다양하게 제어될 수 있다.In Equation (2)

Is an IDFT matrix of size N that is used to convert a signal in the frequency domain to a signal in the time domain. The signal y generated by the above-described method is transmitted by inserting a cyclic prefix by the cyclic prefix inserting unit 160. The method of generating a transmission signal and transmitting it to the receiving side by the above-described method is called an SC-FDMA method. The size of the DFT matrix can be variously controlled for a specific purpose.

Meanwhile, a description will be given of the hybrid ARQ scheme according to the prior art.

2 is a diagram conceptually illustrating an example of applying HARQ.

A detailed implementation method of HARQ applied to a downlink physical layer of a wireless packet communication system may be expressed as shown in FIG. 2. In the example of FIG. 2, the base station determines the terminal to receive the packet and the format of the packet to be transmitted to the terminal (coding rate, modulation scheme, data amount, etc.) and transmits this information first through downlink control channel (HS-SCCH) transmission. Notifies the terminal and transmits the corresponding data packet (HS-DSCH) at the time associated with it. The terminal receives the downlink control channel to know the type and transmission time of the packet to be transmitted to the terminal, and may receive the packet. After the packet is received, after decoding the packet data, if the decoding is successful, the terminal transmits an ACK signal to the base station, and the base station receiving the ACK signal detects that the packet transmission to the terminal is successful and performs the next packet transmission operation. can do. If the terminal fails to decode the packet, the terminal transmits a NACK signal to the base station, and the base station receiving the NACK signal detects that the packet transmission to the terminal has failed, and transmits the same data in the same packet format or a new packet at an appropriate time. Can be retransmitted. At this time, the terminal attempts to decode again by combining the retransmitted packet with a packet that has previously failed to be decrypted.

In addition, the frequency hopping method according to the prior art will be described.

Frequency hopping is used to obtain frequency diversity gain in a general multi-carrier communication system. Frequency hopping refers to a method of obtaining diversity gain on a frequency axis by changing a frequency band to which data is to be transmitted in a multicarrier system according to an arbitrary period. In the multi-carrier communication system, when a user receives a certain band and transmits data when transmitting data, scheduling is performed by appropriately assigning the best band to each user by receiving channel information on the time-frequency axis. A multi-user diversity gain can be obtained through a scheduling method. However, when using a method of allocating and transmitting a predetermined band as described above, if the user's moving speed is fast, since the channel change of the user is fast, the channel has already changed while transmitting the channel information for scheduling and reflecting it in the scheduling. This makes it difficult to reflect accurate information. Therefore, it is difficult to obtain the gain by frequency axis scheduling. In addition, if the amount of data to be transmitted by the user, such as VoIP, is small, the overhead such as channel information and control information required for time-frequency scheduling is larger than the amount of data to be transmitted. Can be difficult to use

3 is a diagram illustrating an example of a data transmission band change pattern according to a frequency hopping scheme.

Specifically, FIG. 3 is a diagram illustrating an example of frequency hopping for obtaining frequency diversity by changing a frequency band used for data transmission of a user in OFDM symbol units. FIG. 3 shows an example of frequency hopping in which a frequency domain for data transmission is changed every OFDM symbol unit, wherein a resource of a frequency axis may be one subcarrier unit of an OFDM symbol and several subcarriers It can be a set. When the frequency hopping, the change of the frequency band may follow a predetermined pattern, and may be arbitrarily selected according to the situation at each transmission time. In a communication system of a multi-cell environment, such a frequency hopping pattern may be differently applied to each neighboring cell to reduce the influence of the interference signal through randomization of the interference signal between neighboring cells. In addition, the period of changing the frequency hopping pattern may be a transmission frame unit in addition to the symbol unit. In the case of a communication system employing HARQ (Hybrid ARQ), the frequency hopping pattern may be changed when a retransmission is required by receiving a NACK signal. It is also possible to change the frequency hopping pattern while retransmitting. This is an example of frequency hopping, and in addition, various methods may be applied according to various hopping patterns and hopping periods. Appropriate jump patterns and jump intervals can be determined according to the characteristics and requirements of each system.

As described above, the frequency hopping scheme for acquiring frequency diversity and the scheduling for multi-user diversity may be selected in consideration of mobility of each user, and thus, a signal of a user using frequency hopping through the same uplink channel may be selected. The user's signals using scheduling may be present at the same time. However, when both the case of using a predetermined band for data transmission in the conventional communication system and obtaining the multi-user diversity gain through frequency axis scheduling and the frequency diversity gain through the frequency hopping scheme, The same problem may occur.

That is, there may be a collision between data of a user using scheduling and data of a user using frequency hopping. In addition, a large amount of control information is required to control both the frequency band allocated to the user who uses the scheduling and the frequency band change pattern of the user who uses the frequency hopping to prevent such an impulse, which may cause excessive overhead. Can be.

In addition, in the uplink of a communication system using the HARQ scheme, synchronous and non-adaptive HARQ is generally used in consideration of overhead and complexity of a control channel. In the transmission system using the synchronous non-adaptive HARQ, even when the frequency hopping is used only during retransmission without using the frequency hopping within the transmission frame as shown in FIG. 3, the user who uses the frequency hopping and the user who uses the scheduling If they exist at the same time, the collision problem of the frequency band used is the same.

Therefore, it is appropriate to consider the allocation of frequency bands for data transmission and / or retransmission according to HARQ, pilot symbol allocation, and signaling heads for data transmission between a user using frequency axis scheduling and a user using frequency hopping. There is a need for a multiplexing scheme.

An object of the present invention for solving the above problems is a multiplexing method for simply allocating a frequency band for data transmission and signal transmission using the same without a collision between a user using frequency axis scheduling and a user using frequency hopping. To provide a way.

In addition, the present invention provides a method of transmitting a pilot symbol so that degradation does not occur in channel estimation despite using frequency hopping in which a data transmission band is changed in a frame.

A multiplexing method according to an embodiment of the present invention for achieving the above object comprises the steps of: dividing the entire frequency band into a first frequency domain and a second frequency domain; And multiplexing, in the first frequency domain, user equipments that determine a data transmission frequency band through frequency hopping in the second frequency domain, respectively.

In this case, the first frequency region may be shared by a plurality of user devices that determine a data transmission frequency band through the frequency hopping, and the user devices that determine a data transmission frequency band through the frequency hopping The method may further include allocating pilots to be distributed and transmitted in the entire frequency band to which the frequency hopping is applied.

In addition, the distribution of the pilot may be performed by any one of frequency division multiplexing (FDM) and code division multiplexing (CDM), and the ratio of the first frequency domain and the second frequency domain may be divided by the frequency hopping. Considering the frequency diversity gain obtained by the user equipments determining the transmission frequency band and the multi-user diversity gain obtained by the user equipment allocated the frequency band through the scheduling You can decide.

On the other hand, the signal transmission method according to another embodiment of the present invention comprises the steps of: requesting the scheduling to the base station; Receiving scheduling information according to the request from the base station; And transmitting data through an allocated frequency band according to the scheduling information, wherein the allocated frequency band is allocated for user equipment that determines a data transmission frequency band through frequency hopping. The first frequency domain is included in the second frequency domain among the second frequency domain allocated for the user equipment to which the frequency band is allocated through the scheduling.

In addition, the signal transmission method according to another embodiment of the present invention includes the steps of determining a data transmission frequency band pattern changed according to the frequency hopping scheme; And transmitting data through each frequency band according to the determined pattern, wherein the entire frequency band according to the determined pattern is a user who determines a data transmission frequency band through frequency hopping. And a first frequency domain allocated for the devices and a second frequency domain allocated for the user equipments allocated the frequency band through the scheduling.

In this case, in the pattern determination step, the frequency band according to the determined pattern is determined to have a pattern changed within one frame, or the frequency band according to the determined pattern is determined to have a pattern changed upon retransmission according to HARQ. The first frequency region may be shared by a plurality of user equipments that determine a data transmission frequency band through frequency hopping.

The method may further include distributing and transmitting pilots in all frequency bands according to the determined pattern, or further distributing and transmitting pilots in the entire first frequency region.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. For example, in the following description, "terminal" as a subject for transmitting an uplink signal will be described mainly as a "base station" as a receiving subject, but need not be limited to these terms. UE) "," Node B "as the receiving entity, etc., also refer to the same meaning.

The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details. In some instances, well-known structures and devices are omitted or shown in block diagram form around the core functions of each structure and device in order to avoid obscuring the concepts of the present invention. In addition, the same components will be described with the same reference numerals throughout the present specification.

4 is a diagram illustrating an example in which frequency hopping and frequency scheduling are simultaneously performed according to an embodiment of the present invention.

Specifically, FIG. 4 illustrates an example of a case where a user using frequency scheduling and a user using frequency hopping are simultaneously transmitted through the same frame.

The region of the frequency axis shown in FIG. 4 may be one subcarrier unit of an OFDM symbol or a set of several subcarriers as described above. When the frequency hopping of the UE using the frequency hopping, the change of the frequency band may likewise follow a predetermined pattern, and may be arbitrarily selected according to the situation at each transmission time.

As shown, scheduling is used when a certain user is using a specific band for scheduling data transmission, and at the same time, a hopping UE using frequency hopping is present in one transmission frame. The user is preferably not using the frequency band used by the user using the frequency hopping. It is also desirable that the user using frequency hopping also does not jump to the frequency band used by the user using scheduling. This is because when the use bands overlap each other, performance deterioration largely occurs due to interference between signals.

Accordingly, one embodiment of the present invention proposes to separate the entire frequency band of the multi-carrier system into a frequency domain for frequency axis scheduling and a frequency domain for frequency hopping. The user can perform frequency axis scheduling and frequency hopping only within each corresponding frequency domain. In this way, if the entire frequency band is divided into an area for frequency scheduling and an area for frequency hopping, each user can perform frequency scheduling and frequency hopping only in that area, thereby avoiding time-frequency resource collision due to the two methods. Since each technique is applied only in a corresponding frequency domain, control information for controlling users of each technique can be further reduced.

However, as shown in FIG. 4, if a frequency hopping region (A region of FIG. 4) is used by a single user and is not shared with other users, the UE using the frequency hopping in every OFDM symbol may perform frequency hopping. The remaining bands are left empty except for the used bands. If the remaining band is not used by other users, the waste of frequency resources is severe and should be used by other users. However, if the UE using scheduling is used, a problem arises due to the collision of frequency resources. If there are more users who use frequency hopping in the case of the example of FIG. 4, and there is no frequency sharing among users who use frequency hopping, and thus the band of the frequency used is much wider, the generated frequency resources Waste will increase further. Therefore, there is a need for an appropriate multiplexing technique to efficiently use the remaining frequency bands left by the use of frequency hopping, and to efficiently transmit within the same frame with a user who uses scheduling.

5A illustrates an example of determining a hopping pattern such that a frequency hopping region is shared by a plurality of users when frequency hopping and frequency scheduling are simultaneously performed according to an embodiment of the present invention.

FIG. 5A illustrates a frequency domain and frequency hopping for a user who uses frequency scheduling in case of applying both frequency axis scheduling and frequency hopping when a user is allocated a predetermined band and transmits data in a multi-carrier system like FIG. 4. A frequency domain for a user to be used is divided and a signal of a UE using both methods is multiplexed in each region. That is, as shown, users who use frequency scheduling and users who use frequency hopping apply frequency scheduling and frequency hopping only within the corresponding regions of each scheme. In addition, in FIG. 5A, one frequency hopping pattern is used in a transmission frame for frequency hopping. In this example, only one frequency hopping is used in a transmission frame. However, frequency hopping can be applied in every OFDM or SC-FDMA symbol unit, and frequency hopping patterns can be applied to various methods.

However, in the case of FIG. 5A, unlike the case of FIG. 4, a frequency hopping region for UEs using frequency hopping is allocated to be shared by a plurality of UE signals. As a method of sharing an area for frequency hopping, a change pattern may be set in advance so as to change a transmission frequency band without collision between a plurality of UEs, or may be determined in real time through frequency hopping pattern information of each UE. It can be in any way to share the region without collision. Such sharing of the frequency hopping region can prevent resource waste as shown in FIG. 4.

Meanwhile, FIG. 5B is a diagram illustrating an example in which a data transmission frequency band of each user is changed upon retransmission in a frequency hopping region when frequency hopping and frequency scheduling are simultaneously performed according to an embodiment of the present invention.

Specifically, FIG. 5B illustrates an example of applying a multiplexing scheme according to an embodiment of the present invention when using a frequency hopping during retransmission in a communication system using the HARQ technique. Similarly, in the above example, the band for frequency hopping and the band for frequency scheduling are distinguished, so that the problem of collision between the frequency domain of the frequency scheduling user and the frequency domain of the user using the frequency hopping during retransmission when synchronous non-adaptive HARQ is used. Can be solved. In addition, FIG. 5B shows an embodiment of the present invention. In addition, when the hop is performed in the frame as shown in FIG. 5A and the re-transmission is used at the same time, it is also applicable to various frequency hopping patterns. It will be apparent to those skilled in the art through the above description.

On the other hand, in the above-described embodiments of the present invention, when the area for frequency hopping and the area for frequency scheduling are divided, the ratio occupied by each of the bands of the entire system is determined according to the characteristics of each system. It is desirable to properly determine the gain and the multi-user diversity gain so that it can be sufficiently obtained. The ratio may be set and fixed in advance, or may be changed at specific times to reflect the traffic situation of the system or the characteristics of the user.

Meanwhile, each user transmits a channel estimation pilot signal (DM pilot signal) for effective data demodulation of respective transmission data. When frequency hopping occurs within a transmission frame as shown in FIG. The pilot signal for the band must be sent. Specifically, in the uplink communication system, since each user transmits a pilot signal for demodulating his or her own data, as shown in FIG. 5A, when a frequency hopping occurs in a transmission frame, the entire band using the frequency hopping. As in the example shown to send a pilot signal for, the frequency band before the hop is made (front part of one frame in FIG. 5A) and the frequency band after the hop is made (after part of one frame in FIG. 5A). The pilot signal must be properly distributed and transmitted.

However, in general, channel estimation using such pilot symbols estimates the rest of the frequency band through interpolation using a straight line or a multi-dimensional curve through a pilot in the same frequency band, and then estimates a channel in the same time domain. This is done in the reverse order, as shown in FIG. 5A. The frequency used for the entire leap through pilots located in different frequency bands, such as the pilot located at the front of the transmission frame and the pilot located at the back, as shown in FIG. If the band is estimated, degradation of channel estimation performance can occur.

Therefore, in case of a user moving at a high speed, interpolation is not possible between two pilot symbols before and after frequency hopping, and thus, degradation of channel estimation performance may occur as described above. If this happens, it is difficult to distribute the appropriate pilot symbols. On the other hand, if only one pilot OFDM symbol is set in the frame, frequency hopping in the frame cannot be applied.

Accordingly, one embodiment of the present invention proposes a method for properly spreading and assigning pilot symbols within a frequency band to which frequency hopping is applied. FIG.

FIG. 6A is a diagram illustrating an example in which pilots of a user using frequency hopping are distributed and transmitted over the entire frequency band to which each user applies frequency hopping according to an embodiment of the present invention, and FIG. 6B is a diagram illustrating one embodiment of the present invention. According to an embodiment, a diagram illustrating an example of transmitting a pilot of a user who uses frequency hopping in a frequency domain for users who use frequency hopping is transmitted.

Specifically, when the hopping pattern as shown in FIG. 6A is used, the frequency domain used for the frequency hopping (for example, the region consisting of the first and third frequency bands used by UE1 using the frequency hopping in FIG. 6A) is the frequency hopping. As part of the frequency domain (“Frequency hopping region” of FIG. 6A) for the entire user, FIG. 6A illustrates a method of variably assigning pilot symbols only to the entire band corresponding to the frequency domain to which each UE applies frequency hopping. One example. By distributing and transmitting the pilot symbols in this manner, it is possible to prevent degradation of channel estimation performance caused by positioning the pilots in different frequency bands as described above.

In addition, in FIG. 6B, the pilot symbols of each user are distributed and allocated to the frequency domain (“Frequency hopping region” of FIG. 6B) for all UEs using frequency hopping, thereby preventing degradation of channel estimation performance as described above. In addition, a user using all frequency hopping may transmit channel information for all bands using frequency hopping so that the frequency hopping pattern may be freely applied within a frequency band using frequency hopping. In the case of FIG. 6B, frequency hopping in units of OFDM or SC-FDMA symbols can be performed, and the frequency hopping pattern can be freely changed in addition to the predetermined pattern.

6A and 6B are embodiments of the present invention to which the distributed allocation of pilot symbols for frequency hopping is applied. In addition, the present invention can be applied to a communication system using frequency hopping only in a specific band. In addition, in addition to the frequency division multiplexing (FDM) scheme shown in FIGS. 6A and 6B in the pilot symbol allocation between users, a code division multiplexing (CDM) scheme within a band for a predetermined frequency hopping. Pilot symbol allocation through multiplexing is also possible.

The multiplexing method of the frequency hopping user signal and the scheduling user signal and the signal transmission method using the same according to an embodiment of the present invention will be described below with reference to each step.

7 is a flowchart illustrating a method of dividing and multiplexing a frequency domain according to an embodiment of the present invention.

As shown in FIG. 7, the multiplexing method according to an embodiment of the present invention first divides the entire frequency band into a frequency domain for UEs using frequency hopping and a frequency domain for UEs using scheduling in step S701. The ratio of each divided area is a multi-user diver obtained by user equipments allocated frequency bands through frequency diversity gain and scheduling obtained by user equipments that determine data transmission frequency bands through frequency hopping. Multi-User Diversity gain can be determined appropriately.

After dividing the frequency domain in this way, in case of UEs using frequency hopping, the transmission data are multiplexed in the frequency domain allocated for frequency hopping among the frequency domains divided in step S702, and the pilot is frequency hopping as necessary. It may be distributed over the entire frequency domain or all the frequency domains allocated for the UE using frequency hopping. In this case, the frequency hopping frequency region is preferably shared by a plurality of user equipments that determine the data transmission frequency band through frequency hopping in order to prevent waste of resources.

Meanwhile, in the case of UEs using scheduling, data is transmitted through the allocated frequency band according to the scheduling information received from the base station in step S703, and the scheduling UE is performed in step S701 of the divided frequency bands as well as the allocated frequency band. It must be located within the area for

8 is a flowchart illustrating a signal transmission method of a user equipment for transmitting data through scheduling according to an embodiment of the present invention.

The UE, which transmits data through scheduling, first requests scheduling from the base station in step S801 and, in response, receives scheduling information from step S802 from the base station. The scheduling information received as described above includes information on a frequency band allocated for uplink data transmission of a corresponding UE, which frequency band is allocated for user equipments that determine a data transmission frequency band through frequency hopping. And may be allocated only within the latter one of the frequency domains allocated for the user equipments to which frequency bands are allocated through scheduling.

The UE may transmit data through the allocated frequency band according to the received scheduling information.

9 is a flowchart illustrating a signal transmission method of a user equipment for transmitting data through frequency hopping according to an embodiment of the present invention.

As shown in FIG. 9, the UE using the frequency hopping determines the data transmission frequency band pattern changed according to the predetermined frequency hopping in step S901. Such a pattern may be a pattern that is changed only once in one frame as shown in FIG. 6A, or may be a pattern that is changed a plurality of times (specifically in every symbol unit) in one frame as shown in FIG. 6B, and FIG. 5B As shown in FIG. 2, the frequency band may be changed when retransmission is performed in a system to which HARQ is applied. Of course, the entire frequency band according to the pattern thus determined is allocated for the user equipments assigned the frequency band through scheduling and the frequency domain allocated for the user equipments for determining the data transmission frequency band through the frequency hopping among the entire frequency bands. Of course, it should be included in the former domain of the frequency domain.

In addition, if necessary, in step S902, pilot symbols for data demodulation may be distributed and transmitted, and this distribution may be distributed over the entire frequency band to which frequency hopping is applied, or the entire frequency range allocated for UEs using frequency hopping. It may be distributed. Then, in step S903, the UE transmits data through the frequency band according to the determined pattern.

The detailed description of the preferred embodiments of the invention disclosed as described above is provided to enable any person skilled in the art to make and practice the invention. Although the above has been described with reference to the preferred embodiments of the present invention, those skilled in the art will variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. I can understand that you can. Accordingly, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

According to one embodiment of the present invention as described above, when both frequency axis scheduling and frequency hopping are applied when data is transmitted using only the zone allocation scheme in a multicarrier system, a band for frequency axis scheduling and a band for frequency hopping are used. By using them separately, multiplexing is possible between users who use each method more efficiently.

In addition, a user using frequency hopping increases the degree of freedom in applying frequency hopping by allocating pilot symbols to all bands for frequency hopping or all bands for frequency hopping.

As described above, the multiplexing method and the signal transmission method using the same according to an embodiment of the present invention are applied to the case where both frequency axis scheduling and frequency hopping are applied when a certain band is used for data transmission in a multi-carrier system. Can be performed.

Claims (12)

Dividing the entire frequency band into a first frequency domain and a second frequency domain; And Multiplexing first user equipments in the first frequency domain that determine a data transmission frequency band through frequency hopping in the second frequency domain, respectively, in the second frequency domain; And a pilot for data demodulation of the first user equipments is multiplexed and transmitted in a frequency division multiplexing scheme in the entire frequency band to which the frequency hopping is applied every transmission period of the pilot. The method of claim 1, And wherein the first frequency region is shared by a plurality of user equipments that determine a data transmission frequency band via the frequency hopping. delete delete 3. The method according to claim 1 or 2, The ratio of the first frequency domain and the second frequency domain is allocated with a frequency diversity gain obtained by the user equipment that determines the data transmission frequency band through the frequency hopping and the frequency band through the scheduling. And determining in consideration of a multi-user diversity gain obtained by the user devices. delete Determining a data transmission frequency band pattern changed according to the frequency hopping scheme; And In the signal transmission method of the user equipment comprising the step of transmitting data through each frequency band according to the determined pattern, The entire frequency band according to the determined pattern is allocated for the first frequency domain allocated for the first user equipments for determining the data transmission frequency band through frequency hopping and for the second user equipments for which the frequency band is allocated through the scheduling. Is included in the first frequency domain of the second frequency domain, The pilot for data demodulation of the first user equipments is transmitted by multiplexing in a frequency division multiplexing scheme in the entire frequency band to which the frequency hopping is applied every transmission period of the pilot. Transmission method. The method of claim 7, wherein In the pattern determination step, And a frequency band according to the determined pattern is determined to have a pattern that changes within one frame. 9. The method according to claim 7 or 8, In the pattern determination step, The frequency band according to the determined pattern is determined to have a pattern that is changed when retransmission according to HARQ, the signal transmission method. The method of claim 7, wherein And wherein the first frequency region is shared by a plurality of user equipments that determine a data transmission frequency band via frequency hopping. delete delete

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