KR20080056616A - Method and apparatus for resource assignment using variable size of resource unit in mobile communication system - Google Patents

Abstract

A method and an apparatus for allocating resources through variable-size resource units in a mobile communication system are provided to maximize frequency selection scheduling gain while minimizing signaling overheads in allocating resources in an OFDMA(Orthogonal Frequency Division Multiple Access) system. A terminal comprises a receiving part(701) and a resource acquisition part(704). The receiving part comprises an information receiving part and a data receiving part. The information receiving part receives resource unit information which denotes a resource unit allocated to the terminal. The resource acquisition part acquires the whole resources, allocated to the terminal, from the received resource unit information. The data receiving part receives data through the acquired whole resources.

Description

Method and apparatus for resource assignment using variable size of resource unit in mobile communication system}

1 is a diagram illustrating a transmitter structure of a general OFDM system.

2 conceptually illustrates resources of a typical OFDM system.

FIG. 3 is a diagram illustrating a frequency band structure when various resource units are taken according to Embodiment 1 of the present invention. FIG.

4 is a diagram illustrating a base station operation according to Embodiment 1 of the present invention;

5 is a diagram illustrating a terminal operation according to Embodiment 1 of the present invention;

6 is a block diagram showing a base station transmitting apparatus according to Embodiment 1 of the present invention;

7 is a block diagram showing a terminal device according to Embodiment 1 of the present invention;

8 is a diagram illustrating a frequency band structure having resource units of irregular size according to Embodiment 2 of the present invention.

FIG. 9 is a diagram showing an example of a resource map having resource units of irregular size according to Embodiment 2 of the present invention; FIG.

10 is a diagram showing the operation of a base station according to Embodiment 3 of the present invention;

11 is a diagram illustrating a terminal operation according to Embodiment 3 of the present invention;

12 is a block diagram showing the structure of a base station apparatus according to Embodiment 3 of the present invention;

13 is a block diagram showing the structure of a terminal apparatus according to Embodiment 3 of the present invention;

14 is a diagram illustrating a method for signaling a resource unit using an indicator according to Embodiment 4 of the present invention.

15 is a diagram illustrating a signaling method of a base station according to Embodiment 5 of the present invention;

The present invention relates to an Orthogonal Frequency Division Multiple Access wireless communication system, and more particularly, to a resource allocation method and apparatus therefor.

Recently, orthogonal frequency division multiple access (OFDM) schemes have been actively studied as a method useful for high-speed data transmission in a wireless channel.

The OFDM method is a method of transmitting data using a multi-carrier, in which a plurality of sub-carriers having parallel orthogonal conversion of symbol strings input in series and mutually orthogonality to each other are used. In other words, it is a type of multi-carrier modulation that modulates and transmits a plurality of sub-carrier channels.

1 is a diagram illustrating a transmitter structure of a general OFDM system.

Referring to FIG. 1, an OFDM transmitter includes an encoder 101, a modulator 102, a serial / parallel converter 103, an IFFT 104 block, a parallel / serial converter 105, and a CP inserter 106. It is composed.

The encoder 101 is called a channel encoding block, and receives a predetermined information bit string as input and performs channel encoding. In general, a convolutional encoder, a turbo encoder, or a low density parity check (LDPC) encoder is used as the encoder 101.

The modulator 102 performs modulation such as quadrature phase shift keying (QPSK), 8PSK, 16QAM, 64 QAM, 256QAM, and the like.

Meanwhile, although omitted in FIG. 1, a rate matching block for performing repetition and puncturing may be additionally included between the encoder 101 and the modulator 102.

The serial / parallel converter 103 receives the output of the modulator 102 and makes a signal in parallel.

An Inverse Fast Fourier Transform (IFFT) block 104 receives an output of the serial / parallel converter 103 as an input and performs an IFFT operation. The output of the IFFT block 104 is transformed into a parallel / serial converter 105. The CP inserter 106 inserts a cyclic prefix (hereinafter referred to as CP) to the output signal of the bottle / serial converter 105.

When the OFDM scheme is used, radio resources can be represented in a two-dimensional array of a time axis and a frequency axis. For example, in the case of a long term evolution (LTE) system, which is an OFDM scheme, a resource representation as shown in FIG.

2 is a diagram conceptually illustrating resources of a general OFDM system.

2, the horizontal axis points to the time axis 201 and the vertical axis points to the frequency axis 202. Seven OFDM symbols are referred to as one slot 204 on the time axis, and two slots are combined to form a subframe 205. In general, the one subframe 205 has the same length as the TTI, which is a basic transmission unit.

Twelve subcarriers for the entire frequency band (Bandwidth, 203) are grouped, and a resource corresponding to one TTI interval is represented by one physical resource block (hereinafter referred to as 'PRB', 206). Will be used.

The PRB refers to a minimum resource unit that can be allocated in data transmission, and the base station allocates one or more PRBs to the terminal through scheduling to enable data transmission.

The method of allocating resources by using the PRB may include a localized transmission method and a distributed transmission method.

In the local transmission scheme, a terminal having one or more PRBs is assigned to receive data from all of the allocated PRBs. The local transmission scheme is used by a low speed terminal to increase frequency selective scheduling gain.

On the other hand, in the distributed transmission scheme, the terminal is used to maximize the frequency diversity gain, and several terminals divide one PRB. That is, a plurality of terminals are bundled and a plurality of terminals are mixed with the PRBs and used together to obtain a frequency diversity gain.

For example, the three PRBs as far as possible from the frequency side are allocated to three terminals, and the three terminals share the three PRBs and use them so that one terminal has the same amount of resources as one PRB. The frequency diversity effect can be obtained while is assigned.

For the local transmission method, the base station should allocate the required number of PRBs to each terminal. In consideration of the state of the terminal and the state of the base station, the number of PRBs allocated to one terminal may be one or more. If a plurality of PRBs are allocated to one UE, the frequency selection scheduling gain can be maximized when the positions of the allocated PRBs can be arbitrarily set.

However, in order to arbitrarily set a location of a PRB in one terminal as described above, signaling such as a bitmap (BITMAP) method is required, and the bitmap method provides one terminal with the number of bits corresponding to the total number of PRBs. Since signaling needs to be transmitted, the signaling overhead increases.

For example, in the LTE system having a 10 MHz system band, since there are 50 PRBs, when a bitmap method is used for one PRB unit, 50 bits of information should be used for resource allocation to one UE.

This can be said that in a wireless communication system using a limited resource, the signaling overhead according to the transmission of the control signal, that is, the allocated resource information is very large.

Accordingly, there is a need in the wireless communication system for a method for reducing signaling overhead for resource allocation while maintaining maximum frequency selection scheduling gain.

The present invention proposed to solve the problems of the prior art as described above, to provide a method and apparatus for transmitting resource allocation information in a wireless communication system.

Another object of the present invention is to provide a method and apparatus for allocating resources through resource units of variable size in a wireless communication system.

Another object of the present invention is to provide a method and apparatus for allocating at least one resource block on a resource basis in consideration of a channel condition of a terminal in a wireless communication system.

Another object of the present invention is to provide a method and apparatus for allocating at least one resource block on a resource basis in consideration of a buffer state of a terminal in a wireless communication system.

The present invention provides a method for allocating resources to a terminal by a base station, the method comprising: setting at least one resource unit having at least one or more resource blocks, allocating the at least one resource unit to at least one terminal, and And transmitting the information about the allocated resource unit to the plurality of terminals.

In the present invention, a method in which a terminal is allocated a resource from a base station, receiving the information on the resource unit from the base station, obtaining a total resource allocated to itself from the resource unit information, and the obtained whole And receiving data through a resource.

In the present invention, a base station apparatus, the control unit for setting at least one or more resource units having at least one or more resource blocks, and allocates the at least one or more resource units to at least one or more terminals, and is allocated to the at least one or more terminals And an information generator for generating information about a resource unit.

The present invention provides a terminal device, comprising: an information receiving unit for receiving resource unit information allocated to the terminal, a resource obtaining unit for obtaining an entire resource allocated to the terminal from the received resource unit information, and the obtained total resources It characterized in that it comprises a data receiving unit for receiving data through.

The present invention is characterized in that the base station is further characterized in that the resource unit is reset every predetermined time interval.

The present invention is characterized in that the base station is further characterized in that the resource unit is set in a predetermined resource map.

The present invention is characterized in that the base station further comprises a resource unit is set by the indicator indicating the resource unit.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators.

Therefore, the definition should be made based on the contents throughout the specification. Meanwhile, the present invention has been described using an LTE system as an example. However, the present invention can be applied to a wireless communication system to which base station scheduling is applied.

The present invention proposes a method for reducing signaling overhead for resource allocation in a wireless communication system. In the wireless communication system, a method for managing forward resources according to multiplexing of forward control information and data is proposed.

The present invention first proposes a method of optimizing signaling overhead by changing a resource allocation setting in consideration of a channel condition or a buffer state of terminals belonging to an arbitrary cell and using a resource allocation method suitable for the situation.

In addition, in the present invention, the information on the resource allocation setting may be transmitted to all terminals by the base station using broadcast information, or may be notified to each terminal through higher signaling. Even when transmitted through the broadcast information, when transmitting using broadcast information having an arbitrary period, a method in which a resource allocation method previously determined is continuously used may be used between the periods, or every TTI In order to change the resource allocation method every time, information transmitted to every TTI may be transmitted to all terminals.

<Example 1>

Embodiment 1 of the present invention proposes a method of allocating a plurality of PRBs as one resource allocation unit as necessary. That is, any base station (or cell) determines a PRB number unit effective for resource allocation in consideration of a situation and informs all the terminals of the base station currently included in the base station. In performing resource allocation to the terminal, the base station uses an allocation unit of a set PRB size.

3 is a diagram illustrating a frequency band structure when various resource units are taken according to Embodiment 1 of the present invention. Referring to FIG. 3, an example of a system having 25 PRBs is shown as 301.

3 shows a state in which a resource allocation unit represents one PRB. That is, the configuration of the 302 is the most flexible in resource allocation, and the frequency selection scheduling gain is the largest scheme, while the signaling overhead is the largest. That is, the number of signaling bits required for resource allocation using a bitmap (BITMAP) scheme to one terminal becomes 25 bits.

On the other hand, 303 of FIG. 3 shows a resource allocation unit set to two PRBs. Since the total number of PRBs is 25, two PRBs are bundled to form 12 groups, and the last group is set as one. That is, when the base station sets the resource allocation unit to two PRBs, the base station performs resource allocation using 13 allocation units as shown in 303, and thus 13 bits of signaling are required for each terminal.

This can reduce the 12-bit signaling compared to allocating resources in one PRB unit of 302, while on the other hand, a terminal that does not need two PRBs, or two that want to be allocated, is performed by performing scheduling in two PRB units. It may be accompanied by a decrease in the scheduling performance in the terminal and the like PR stations apart from each other.

Meanwhile, 304 in FIG. 3 shows a resource allocation unit set to three PRBs. Since the total number of PRBs is 25, 8 PRBs are grouped by 3 PRBs and the last group is set as one. That is, when the base station sets the resource allocation unit to three PRBs, the base station performs resource allocation using nine allocation units as shown in 304, and thus 9 bits of signaling are required for each terminal.

Compared to performing resource allocation using one PRB such as 302 or two PRB units such as 303, the resource allocation of 304 can reduce signaling overhead, but of course can be accompanied by a decrease in scheduling performance. have.

Accordingly, the present invention proposes that the base station sets the resource allocation unit in consideration of the amount of data desired by the terminals or the channel condition of the terminals.

4 shows a process of setting a resource allocation unit of a base station according to Embodiment 1 of the present invention and a resource allocation process according thereto.

Referring to FIG. 4, when the transmission process 401 starts, the base station determines a channel state or a buffer state of each of the terminals belonging to the base station in step 402.

In step 403, the base station sets a resource allocation unit suitable for the situation of each terminal, and transmits the resource allocation unit information set above to the terminals belonging to the base station in step 404.

Here, if the channel condition of the terminal is good and there are enough resources for signaling, the resource allocation unit may have a small unit such as one PRB. In other words, the most flexible method for resource allocation and the largest frequency selection scheduling gain are applied. On the other hand, if the channel condition of the terminal is good, but there are not enough resources for signaling, having at least one PRB, by setting a resource allocation unit to signal. This can be flexibly allocated in consideration of the channel state and the buffer state of the terminal as shown in FIG.

Transmission of the configured resource allocation unit information may be transmitted to all terminals at once by a broadcast method, or may be notified to each terminal through higher signaling.

In step 405, the base station performs scheduling in consideration of the set resource allocation unit. In step 406, the resource allocation determined through the scheduling is transmitted to the terminal to be allocated using signaling for the set resource allocation unit, and the process ends in step 407.

5 is a diagram illustrating the operation of the terminal according to the first embodiment of the present invention, and shows a process of receiving the resource allocation information by the terminal as the base station changes the resource allocation setting.

Referring to FIG. 5, when the terminal operation is started 501, the terminal receives resource allocation unit information transmitted from the base station in step 502.

In step 503, resource allocation information is received through a signaling format suitable for the configured resource allocation unit. The resource allocation unit information is transmitted in a broadcast manner or received through the higher signaling.

For example, all terminals receive the same information through a broadcast channel called cat 0. Cat 0 denotes a structure of a signaling channel and is a term used to collectively broadcast information.

In addition, higher signaling is a method for signaling to a terminal by including control information using a data channel for each terminal. For example, the RRC information transmission may be referred to as higher signaling. The reason for including higher signaling in the present invention is to include a situation in which a terminal receiving data transmission, that is, an active state terminal does not receive broadcast information.

In step 504, the allocated resource is determined using the received resource allocation information. After the data is transmitted and received using the allocated resource, the operation ends in step 505.

6 is a block diagram showing an apparatus for transmitting a base station according to Embodiment 1 of the present invention.

Referring to FIG. 6, the scheduler 602 sets resource allocation unit information by determining a channel state or a buffer state of a terminal, and uses the resource allocation unit information 601 for each terminal under its control. Perform resource allocation scheduling. The set resource allocation unit information is stored in the memory unit 601.

The resource allocation information generation unit 603 generates resource allocation information for the terminal determined through the scheduling. In addition, the resource allocation information generation unit 603 also generates information of an appropriate transmission format according to the set resource allocation unit information 601.

The transmitter 604 transmits the generated resource allocation information to the terminal. In addition, the generated transmission format information may also be transmitted.

7 is a block diagram showing a terminal device according to Embodiment 1 of the present invention.

Referring to FIG. 7, the terminal receives a signal transmitted by the base station from the receiving unit 701. The memory 702 stores resource allocation unit information among the received signals.

The resource allocation information decoder 703 decodes the signal received through the receiver 701 according to a set decoding scheme. That is, the resource allocation information is decoded in the received signal.

The obtaining unit 704 checks whether the terminal allocates resources through the decoding process. That is, when a resource is allocated to the terminal, the entire resource allocated to the terminal is obtained using the decoded resource allocation information and the resource allocation unit information stored in the memory 702.

Thereafter, the receiving unit 701 receives data transmitted through the obtained total resource.

As described above, in the first embodiment, the base station sets a resource allocation unit to one PRB, two PRBs, or a plurality of PRBs larger than the channel state and the buffer state of the terminal. Explain how you can do it.

In Embodiment 1 of the present invention, setting of other integer multiple PRBs has not been described. However, in the present invention, the base station sets another constant PRB in one resource allocation unit in consideration of the channel state and the buffer state of the terminal. It is possible. Accordingly, according to the present invention, the number of bits of the BITMAP representing one resource allocation unit is set variably, thus minimizing signaling overhead.

Hereinafter, a resource allocation method using an irregularly sized resource unit according to the present invention will be described.

In general, some terminals that are scheduled at the same time may be a terminal requiring a small amount of data, and at the same time, there may be a terminal that requires a large amount of data. Therefore, a terminal to which only one PRB is to be scheduled and a terminal to which two or more PRBs are to be scheduled may exist at the same time.

In addition, assuming that the PRB size is not very large, there is no difference in channel response in units of PRBs depending on the channel state of the UE, so that a terminal having a similar channel response of an adjacent PRB exists.

Accordingly, in consideration of the situation of the terminal, as shown in FIG. 8, a resource map having a resource unit having an irregular size is constructed. In this case, a method of allocating a resource to a terminal using a bitmap-like scheme in the map is provided.

FIG. 8 is a diagram illustrating a frequency band structure having a resource unit of irregular size according to Embodiment 2 of the present invention. FIG. 8 shows an example of a resource map. It can be seen that the resource unit is not fixed to one size constantly, but may have various sizes.

Referring to FIG. 8, as shown at 801, the entire band 5MH has 25 PRBs.

At 802, 805, 808, 811, and 814, resource allocation units are the same with one PRB size.

On the other hand, at 803, 806, 809, and 812, the resource allocation unit is the same with two PRB sizes.

Meanwhile, at 804, 807, 810, and 813, the resource allocation unit is the same with three PRB sizes.

That is, according to the second embodiment, the entire frequency band is divided using resource units having three different sizes to allocate the irregular size resource to the terminal.

The benefit of the present invention is that the terminal scheduled at the same time may require a different size of the PRB, a terminal that is allocated resources in the smallest unit (for example, the same unit as the size of one PRB in Figure 8) In addition, scheduling for such a terminal is possible. In addition, assuming that all terminals do not need the small unit (for example, one resource allocation unit) and that channel responses between adjacent PRBs are similar, it is possible to have a resource unit having a size of several PRBs together. It is possible.

Accordingly, when scheduling is performed as in Embodiment 2, signaling overhead is reduced, and the channel response may have an effect of adaptively scheduling the same PRBs corresponding to similar terminals.

In addition, according to the embodiment, the resource map having a resource unit of irregular size may exist in various ways depending on the size of the resource unit and the positions occupied by the resources of each size on the frequency. At this time, the resources of the same size is spread over the entire band as possible can increase the scheduling gain.

That is, a terminal that desires a resource of one PRB size may select one of resources of 802, 805, 808, 811, and 814 as shown in FIG. 8 for scheduling. Since the resources are spread over the entire band apart from each other as a whole, the difference in the channel response between each resource can be increased, thereby increasing the frequency selection scheduling gain.

9 is a diagram illustrating another example of a resource map having a resource unit of irregular size according to Embodiment 2 of the present invention.

Referring to FIG. 9, all four resource maps are configured to represent bitmaps using only 13 bits by using a frequency band having 25 PRBs.

In FIG. 9, for example, resources of the same size are not gathered in frequency, but can be seen spread over the entire band. In addition, the resource map may vary in size of the resource unit used and the number of resources of each size. Thus, there is a gain in frequency selection scheduling.

9, 901 shows four PRB one size unit (0, 4, 8, 12), six PRB two size unit (1, 3, 5, 7, 9, 11), three PRB three size unit It consists of (2, 6, 10).

902 and 903 are identical in terms of 5 PRB 1 size unit, 4 PRB 2 size units, and 4 PRB 3 size units, but are divided according to the location of each size resource.

Here, 902 is a resource allocation unit, 0, 3, 6, 9, 12 are set to one PRB, 1, 4, 7, 10 are set to two PRBs, and 2, 5, 8, 11 These three PRBs are set. On the other hand, 903 is a resource allocation unit, 1, 4, 7, 11, 12 are set to one PRB, 2, 5, 8, 10 are set to two PRBs, and 0, 3, 6, 9 are It is set to three PRBs.

On the other hand, the 904 is composed of nine PRB one size unit and four PRB four size unit, unlike the previous 901, 902, 903, one PRB size (0, 2, 3, 5, 6, 8, 9) , 11, and 12) and a resource map using only resource allocation units of four PRB sizes (1, 4, 7, and 10). In the above description, the resource allocation unit may have a size other than 1, 2, 3, or 4.

10 to 13, a process of performing resource allocation using a resource map having resource units of irregular sizes in FIGS. 8 and 9 will be described.

<Example 2>

Embodiment 2 of the present invention provides a method of directly setting a resource map to a terminal by a base station. In Embodiment 2 of the present invention, the base station determines a resource map to be set for a certain period and informs all the terminals to which resources are allocated from the base station. The base station provides the broadcast information in a manner of informing the terminal of the resource map information. There may be a method of transmitting to all terminals by using and a method of notifying each terminal through higher signaling.

Even when transmitted through the broadcast information, when transmitting using broadcast information having an arbitrary period, the resource map set immediately before the period continues to be used between the periods.

Alternatively, the resource map information may be transmitted to all terminals using information broadcasted every TTI (Cat 0 information used in LTE) so that the resource map may be changed every TTI.

The base station sets a resource map suitable for the situation by using the resource size information required by the terminal to which the resource is allocated and the channel state information (CQI) that the terminal informs the base station. do.

In addition, the method of expressing the resource map itself may be used as a method of expressing the resource map in the process of delivering the resource map to the terminal, or predetermined number of resource maps may be predetermined, A method of setting a resource map may be used by transmitting an indicator indicating a.

When a plurality of resource maps are pre-determined, a method for reducing signaling overhead by setting an allowable resource map itself among the presumable resource maps to reduce the number of allowable resource maps and instructing one resource map therein Can also be used.

The base station, the terminal operation and the base station, the device diagram for the second embodiment of the present invention can be used the same as the base station, the terminal operation and the base station, the device diagram for the first embodiment, instead of the base station is set in the first embodiment and the terminal Compared to the size of the resource unit to be interpreted, in the second embodiment of the present invention, the part set by the base station and interpreted by the terminal is changed to a resource map to operate.

Example 3

In the third embodiment of the present invention, the base station does not set the resource map every time, and a predetermined plurality of predetermined resource maps are determined in advance, and a different resource map is used according to time.

The base station and the terminal store a plurality of predetermined resource maps in a memory, and the base station and the terminal share information on which resource map is used in any time interval according to the time information.

As an example, assuming that the resource map uses the four types of FIG. 9, the base station and the terminal may sequentially use the resource map of 901 of FIG. 9 and the resource maps of 902, 903, and 904 according to the TTI.

In addition, when using different resource maps according to time, the base station and the terminal may store a predetermined resource map for possible resource maps, or the plurality of resource maps available through higher signaling or broadcast information. You can also use the method to tell each configuration.

When using various kinds of resource maps, the following method can be used as a reference for setting the resource maps. That is, a resource unit of the same size is set to be located at a different position as much as possible with respect to another resource map, so that the resource unit of any size is located over the entire band as time passes.

If a resource map in which a resource unit having a different size is located at a frequency position most preferred by the terminal that is to be allocated the resource of the size is used, wait for time and then locate a resource map of a desired size resource unit at the location. The method of allocating the resource to the terminal at this set time is enabled. If the above resource map is used, there is a benefit in improving system performance over transmission delay.

FIG. 10 is a diagram illustrating an operation of a base station according to Embodiment 3 of the present invention, and shows a process of allocating resources to terminals by a base station according to the resource allocation method as shown in FIGS. 8 and 9.

Referring to FIG. 10, when the transmission process starts in step 1001, the base station determines current time information in step 1002. As the current time information, a TTI or a system frame number may be used.

In step 1003, the base station sets a resource map determined according to the time information and performs scheduling for a plurality of terminals using the set resource map in step 1004. As an example, assuming that the resource map uses the four types of FIG. 9, the base station and the terminal may sequentially use the resource map of 901 and the resource maps of 902, 903, and 904 according to the TTI. In this case, the used resource map may be transmitted through an indicator.

The resource allocation determined through the scheduling in step 1005 is transmitted to the terminal allocated using the signaling, and the process ends in step 1006.

11 is a diagram illustrating a terminal operation according to Embodiment 3 of the present invention, in which the terminal receives resource allocation information and finds an allocated resource according to the resource allocation method as shown in FIGS. 8 and 9. Show the process.

Referring to FIG. 11, when the terminal operation starts in step 1101, the terminal first determines current time information in step 1102. Here, the current time information may use a TTI or a system frame number.

In step 1103, the terminal establishes a resource map corresponding to the current time information. In step 1104, the resource allocation signaling transmitted from the base station is received and decoded to receive resource allocation information.

In step 1105, the terminal checks the received resource allocation information according to the set resource map to determine the resources actually assigned to it.

After transmitting and receiving data using the allocated resource in step 1106, the operation ends in step 1107.

12 is a block diagram illustrating a structure of a base station apparatus according to Embodiment 3 of the present invention, and shows a transmitting apparatus of a base station according to the resource allocation method as shown in FIGS. 8 and 9.

Referring to FIG. 12, the base station transmitter stores all possible resource maps in the memory 1201. The resource maps may store a predetermined resource map or a resource map determined according to a configuration of a base station.

The scheduler 1203 determines a resource map at a current time point using a plurality of resource maps included in the memory 1201 and time information 1202 corresponding to a TTI or system frame number, and uses the resource map. Scheduling is done so that

The resource allocation information generation unit 1204 generates resource allocation information to terminals to which resources are allocated according to the scheduler 1203.

The transmitter 1205 transmits the generated resource allocation information to the corresponding terminal.

FIG. 13 is a block diagram illustrating a structure of a terminal device according to Embodiment 3 of the present invention, and illustrates a terminal device according to the resource allocation method as shown in FIGS. 8 and 9.

Referring to FIG. 13, the receiver 1301 of a terminal receives a signal transmitted by a base station.

The resource allocation information decoder 1304 decodes the received resource allocation information and transmits the received resource allocation information to the allocation resource determination unit 1304.

The allocation resource determiner 1304 determines the allocated resource. In this case, the allocation resource determiner 1304 determines a resource map at the current time point using a plurality of resource maps stored in the memory 1302 and time information 1303 corresponding to a TTI or a system frame number. . That is, the resource map of the current time point is determined by using the received resource allocation information using time information corresponding to a current TTI or a system frame number, and the allocation resource of the current time point is determined accordingly.

Example 4

Embodiment 4 of the present invention provides a method of changing a size of a resource allocated according to an indicator by including an indicator in resource allocation signaling so that a predetermined resource allocation size or a resource map is not required.

14 is a diagram illustrating a method for signaling a resource unit using an indicator according to a fourth embodiment of the present invention. First, assuming two kinds of resource sizes that can be allocated, basic signaling is configured by using a bitmap method based on a large resource size.

Referring to FIG. 14, 1401 shows that two PRBs are used as resource allocation units in a system having 50 PRBs.

If the base station sets the indicator included in the signaling to type 1, it allocates resources in units of two PRBs using 25 bits.

On the other hand, if the indicator included in the signaling is set to type 2, such as 1402, resources are allocated in one PRB unit. In the case of Type 2, since the total number of resources that can be allocated is 50, only half of the resources that can be informed using 25 bits are available. Therefore, in case of type 2, only resources located at odd positions are allocated in units of two PRBs such as 1404 and 1405.

Therefore, resources located at even positions in two PRB units, such as 1406, are allocated using two types of PRB units.

As illustrated in FIG. 14, the fourth embodiment determines a signaling method for a plurality of PRBs in one resource unit, and may allocate resources in units smaller than the resource allocation unit at an arbitrary location including an indicator.

Example 5

Embodiment 5 of the present invention provides a method of allocating resources using a unit in which a CQI is transmitted in setting a resource map. That is, the basic unit of the resource map is a transmission unit of the CQI, and provides room for using a small resource by separating resources within the one CQI transmission unit. Hereinafter, Example 5 of the present invention will be described in detail with reference to FIG. 15.

15 is a diagram illustrating a signaling method of a base station according to Embodiment 5 of the present invention.

Referring to FIG. 15, in a signaling method of a base station, first, a plurality of resource blocks RB1 to RB24 are bundled into subbands (subbands, 1501 to 1608), and terminals are referenced based on the respective subbands 1501 to 1508. Sends a CQI. Various methods may be used for CQI transmission, and the minimum unit is the subbands 1501 to 1508. The base station scheduler allocates resources 1511 to 1534 to the UEs after performing scheduling based on the CQI. Since the CQI was transmitted based on the subbands 1501 to 1508, the scheduler also includes the resources 1511 to. 1534 is allocated to the subband units 1501 to 1508. In this case, when the resources 1511 to 1534 are allocated based only on the subbands 1501 to 1608, resource efficiency is reduced in transmitting small data.

Accordingly, even-numbered subbands 1502, 1504, 1506, and 1508 in FIG. 15 are allocated using the sizes of the subbands 1502, 1504, 1506, and 1508 as they are, and odd-numbered subbands, 1501 and 1503. 1505 and 1507 divide data into resource block units included therein to allocate data. That is, since the subband 1501 has three resource blocks RB1, RB2, and RB3, it is divided into one resource block (RB1 = R ₁ , 1511) and two resource blocks (RB2 + RB3 = R ₂ , 1521). Give each possibility to allocate data. Similarly, subband 1503 is one resource block (RB7 = R ₄ , 1512) and two resource blocks (RB8 + RB9 = R ₅ , 1522), and subband 1505 is one resource block (RB13 = R). ₇ , 1513) and two resource blocks (RB14 + RB15 = R ₈ , 1523), subband 1507 has one resource block (RB19 = R ₁₀ , 1514) and two resource blocks (RB20 + RB21 = R). ₁₁ , 1524). Therefore, the set of resources that can be allocated by the base station, that is, the resource map is the same size as the resource (1511 to 1514) having one resource block size and the resource (1521 to 1524) having two resource block sizes, and the subband size Resources 1153-1534.

Depending on the size of the subband, the size of resources divided in one subband may vary. The subdivision of the subbands may be applied over time or according to the setting of the base station. The subbands may be selected and divided. It may vary. As the resource map is set based on the CQI transmission unit, a terminal transmitting a large size of data is found and allocated to one or a plurality of subbands having the best channel response to the CQI of the terminal. The terminal transmitting data finds one or more subbands having the best channel response according to the CQI of the terminal among the divided subbands, and divides resources (one or more) contained in the found subbands. ) Can be allocated a resource of a suitable size of a good band.

In addition, in the fifth embodiment of the present invention, the base station also provides a method of transmitting signaling to the terminal based on the resource map. Using the resource map, the base station can inform the terminal of allocated resources in various ways. Hereinafter, two methods will be described.

The first signaling method informs the resource map using the bitmap method. This method can maximize scheduling flexibility, and can allocate resources of appropriate size desired by the terminal to a good bandwidth of the terminal for any terminal. That is, as shown in 1541 of FIG. 15, all possible resources are allocated using the bitmap.

In the second signaling method, resources are allocated to terminals transmitting small data using only the divided small resources (for example, one resource block), and resources are allocated to other terminals using resources of a size other than the small resources. Is the way to assign. That is, as shown in 1542 of FIG. 15, the size of the resource to be allocated by the base station is selected using an indicator of one bit or a plurality of bits, and the resources of the selected size are allocated using the bitmap 1543. In FIG. 15, a resource of one resource block size is divided into a resource of a different size, and according to the indicator 1542, the resources 1511 to 1514 composed of one resource block are informed to the bitmap 1544, and the remaining resources 1521. 1534 to 1534, a different indicator is used to inform using the bitmap 1543. Different sizes of the bitmap 1543 and the bitmap 1544 may be compensated for through padding.

While the second signaling method limits scheduling flexibility to some extent, compared to the first method, the signaling overhead can be reduced. [0039] While the detailed description of the present invention has been described with reference to specific embodiments, it is within the scope of the present invention. Of course, many variations are possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

The present invention can increase the frequency selection scheduling gain while minimizing the signaling overhead in resource allocation in an orthogonal frequency division multiple access communication system.

In addition, the present invention provides an advantage of maximizing reception performance by variably setting resource allocation according to resource allocation in consideration of channel conditions and buffer conditions of terminals.

In addition, the present invention provides an advantage of increasing the resource efficiency of the terminal by receiving resources in different resource allocation units for each time information.

In addition, the present invention provides an advantage that the terminal receives an indicator indicating a different resource allocation unit, by identifying the allocated resource through the defined resource allocation unit information corresponding to the indicator, significantly reducing the signaling overhead between base stations do.

Claims (7)

In the method for allocating resources to the terminal by the base station, Setting at least one resource unit having at least one resource block; Allocating the at least one resource unit to at least one terminal; And transmitting the information on the allocated resource unit to the at least one terminal. In the method that the terminal is allocated resources from the base station, Receiving information about a resource unit from a base station; Obtaining an entire resource allocated to the user from the resource unit information; And receiving data through the obtained total resources. In the base station apparatus, A controller for setting at least one or more resource units having at least one or more resource blocks and allocating the at least one or more resource units to at least one or more terminals; And an information generator for generating information about the at least one resource unit allocated to the at least one terminal. In the terminal device, An information receiver configured to receive resource unit information indicating a resource unit allocated to the terminal; A resource obtaining unit which obtains an entire resource allocated to itself from the received resource unit information; Terminal device including a data receiving unit for receiving data through the obtained total resource. The method of claim 4, wherein The resource unit is Terminal device, characterized in that reset for every predetermined time interval. The method of claim 5, The resource unit, Terminal device, characterized in that set in the predetermined resource map. The method of claim 5, The resource unit, And an indicator indicating the resource unit.

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