KR20140001461A - Method and apparatus for transmitting a uplink in inter-cell carrier aggregation system - Google Patents

Abstract

The present invention relates to a device and method for transferring uplink signals without inter-modulation which includes feedbacks necessary for scheduling of each base station having different terminals if cooperation among the base stations of a frequency integrated system. According to the invention, the method for transmitting an uplink channel from the terminal to the base station comprises a step of receiving a first downlink channel from a first base station and receiving a second downlink channel from a second base station, and a step of transferring the uplink channel of the first downlink channel through a first resource to the first base station and transferring the uplink channel of the second downlink channel through a second resource to the second base station. The sub-frame of the first resource and the sub-frame of the second resource do not exist in the same time axis as a characteristic to the present invention. According to the invention, it may prevent the occurrence of intermodulation among the different frequency bands, and the downlink and uplink can both transmit and receive the different bands from different base stations at the same time. Therefore, the transmission rate of the terminal can be increased to its maximum.

Description

Method and apparatus for transmitting uplink signal in inter-station frequency integrated system {METHOD AND APPARATUS FOR TRANSMITTING A UPLINK IN INTER-CELL CARRIER AGGREGATION SYSTEM}

The present invention relates to an uplink transmission method and apparatus in an inter-base station frequency integration system. More specifically, the present invention provides a method and apparatus for transmitting a uplink signal including feedback necessary for scheduling of each base station to a different base station without channel intermodulation when coordination is slow between base stations in an inter-base station frequency integration system. It is about.

In general, mobile communication systems have been developed to provide voice services while guaranteeing user activity. However, the mobile communication system is gradually expanding not only to voice but also to data service, and now it has developed to the extent of providing high-speed data service. However, in a mobile communication system in which services are currently being provided, there is a demand for a more advanced mobile communication system due to a shortage of resources and a high-speed service demand of users.

In response to these demands, a specification for Long Term Evolution-LTE (LTE-A) is underway in the 3rd Generation Partnership Project (3GPP) as one system being developed as a next generation mobile communication system. LTE-A is a technology for implementing high-speed packet-based communication having a transmission rate of up to about 1 Gbps. Various methods are discussed for this purpose, for example, a method of extending the number of base stations to which a terminal is connected, a method of using a plurality of frequency bands, and the like.

When the number of base stations to which the terminal is connected is one or more, if cooperation between base stations is slow, the terminal needs to transmit feedback necessary for scheduling of each base station to different base stations. Particularly, when two base stations to which a terminal is connected use different frequency bands and the terminal uses these different frequency bands, the terminal transmits uplink transmissions to different base stations. may cause problems.

Therefore, a technique for transmitting an uplink signal to a base station using different frequency bands without channel intermodulation is required.

The present invention is to solve the above problems. In particular, in the present invention, when coordination is slow between base stations in an inter-base station frequency aggregation system, an MS may transmit an uplink signal including feedback necessary for scheduling of each base station to different base stations without channel intermodulation.

In order to solve the above problems, according to the present invention, a method for transmitting an uplink channel to a base station by a terminal receives a first downlink channel from a first base station and receives a second downlink channel from the second base station. step; And transmitting an uplink channel for the first downlink channel to the first base station through a first resource, and transmitting an uplink channel for the second downlink channel to the second base station through a second resource. And the subframe of the first resource and the subframe of the second resource are not present on the same time axis.

In addition, according to the present invention, a terminal for transmitting an uplink channel to a base station, the transceiver for transmitting and receiving a signal with a first base station or a second base station; And receiving a first downlink channel from the first base station, receiving a second downlink channel from the second base station, and assigning an uplink channel for the first downlink channel through a first resource to the first base station. And a control unit for controlling to transmit an uplink channel for the second downlink channel to the second base station through a second resource, the subframe of the first resource and the subframe of the second resource. Is not present on the same time axis.

The present invention proposes an uplink signal transmission method and an apparatus therefor in an inter-base station frequency integration system, through which a terminal is pre-allocated a control channel transmission time point transmitted to different base stations and based on the downlink of a plurality of subframes. A response channel and a control channel for data channel transmission may be aggregated and transmitted in each frequency band used by each base station.

Through this, the UE can prevent the generation of intermodulation between different frequency bands, and also transmits a control channel required for a base station having a very slow communication speed between base stations so that the UE can transmit different bands in downlink and uplink to different base stations. Simultaneous transmission and reception is possible from the terminal to increase the maximum transmission rate of the terminal.

1 is a diagram illustrating a set of frequencies between base stations in a communication system;
2 is a diagram illustrating a frequency band to which a terminal is connected;
3 is a diagram illustrating an uplink transmission method in a frequency set communication system;
4 illustrates uplink transmission according to the first embodiment of the present invention;
5 shows uplink transmission according to a second embodiment of the present invention;
6 shows uplink transmission according to a third embodiment of the present invention;
7 illustrates uplink transmission according to a fourth embodiment of the present invention;
8 illustrates a control channel transmission method according to an embodiment of the present invention;
9 is a flowchart illustrating the operation of a base station according to an embodiment of the present invention;
10 is a flowchart illustrating the operation of a terminal according to an embodiment of the present invention;
11 illustrates a base station apparatus for transmitting an uplink signal according to an embodiment of the present invention;
12 illustrates a terminal device for receiving an uplink channel signal in an OFDM communication system according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

In the following description, although the LTE (Long Term Evolution) system and LTE-A (LTE-Advanced) system has been described as an example, the present invention can be applied to other communication systems to which base station scheduling is applied.

The OFDM transmission method is a method of transmitting data using a multi-carrier, which parallelizes a series of serially inputted symbol strings and has a mutual orthogonal relationship with each other, thereby providing a plurality of multi-carriers, that is, a plurality of multi-carriers. It is a kind of multi-carrier modulation that modulates and transmits sub-carrier channels.

In the OFDM scheme, a modulated signal is located in a two-dimensional resource composed of time and frequency. The resources on the time axis are distinguished by different OFDM symbols and they are orthogonal to each other. The resources on the frequency axis are distinguished by different subcarriers and they are also orthogonal to each other. That is, in the OFDM scheme, if a specific OFDM symbol is designated on the time axis and a specific subcarrier is designated on the frequency axis, one minimum unit resource may be indicated, which is called a resource element (RE). Since different REs have orthogonality to each other even though they pass through a frequency selective channel, signals transmitted to different REs may be received at a receiving side without causing mutual interference.

A physical channel is a channel of a physical layer for transmitting a modulation symbol modulating one or more encoded bit streams. In Orthogonal Frequency Division Multiple Access (OFDMA) systems, a plurality of physical channels are configured and transmitted according to the purpose of the information string to be transmitted or the receiver. The transmitter and the receiver must promise in advance which RE to arrange and transmit one physical channel. The rule is called mapping.

In an OFDM communication system, a downlink bandwidth is composed of a plurality of resource blocks (RBs), and each physical resource block (PRB) is arranged along a frequency axis. Subcarriers and 14 or 12 OFDM symbols arranged along the time axis. Here, the PRB is a basic unit of resource allocation.

A reference signal (RS) is a signal received from a base station to allow a terminal to estimate a channel. In an LTE communication system, a common reference signal (CRS) and a dedicated reference signal are used. One of them includes a demodulation reference signal (DMRS).

The CRS is a reference signal transmitted over the entire downlink band and can be received by all terminals. The CRS is used for channel estimation, configuration of feedback information of the terminal, or demodulation of control channels and data channels. DMRS is also a reference signal transmitted over the entire downlink band and is used for data channel demodulation and channel estimation of a specific terminal. Unlike CRS, it is not used for feedback information configuration. Therefore, the DMRS is transmitted through the PRB resource to be scheduled by the UE.

A subframe on the time axis consists of two slots of 0.5 msec length, namely a first slot and a second slot. A physical dedicated control channel (PDCCH) region, which is a control channel region, and an enhanced PDCCH (ePDCCH) region, which is a data channel region, are divided and transmitted on a time axis. This is for quickly receiving and demodulating control channel signals. In addition, the PDCCH region is located over the entire downlink band, and one control channel is divided into a small number of control channels and distributed in the entire downlink band.

The uplink is divided into a control channel (PUCCH) and a data channel (PUSCH), and the response channel and other feedback information for the downlink data channel are transmitted through the control channel when there is no data channel, and when there is a data channel. Is sent.

1 illustrates an inter-base station frequency aggregation structure applied in the present invention.

Referring to FIG. 1, when the macro base station 101 is installed in a network, a cell region is installed at a large high frequency power for wide coverage, and when additional bandwidth is possible, a low power pico as shown in FIG. 103. In this case, a base station may be installed. In this case, a frequency band different from that used by the macro base station 101 may be used for a low cell area.

In this case, the terminal 107 may use all different frequency bands. However, when the terminal 107 uses all the different frequency bands, different cells use the respective frequency bands. In a conventional system, a system design capable of fast inter-base station X2 communication 105 between a picocell of FIG. 103 and a base station of a macro cell of FIG. 101 is possible. However, when a large number of picocells occur, such communication may be impossible or very slow. In this case, the network can transmit and receive different base stations using different frequency bands to improve the performance of one terminal, but it is impossible for one base station to schedule frequency bands used by other base stations.

If there is no fast enough inter-base station communication 105, each base station should perform separate scheduling for each frequency band used by the terminal, and also in the case of the existing system that also transmits feedback to only one base station. Of the base station 101 should transmit the control channel information fed back to the other base station 103 to the X2 communication 105, which is impossible by the slow X2 communication 105, so that the terminal 107 is connected to each base station 103. , Separate uplink channels (109, 111) to be transmitted to 109.

2 illustrates a frequency band connected to a terminal.

Referring to FIG. 2, when a terminal accesses two base stations and when each base station uses a different frequency band, a frequency band may be configured as shown in FIG. 2. When the macro base station 101 uses the frequency band A of 201, the downlink of the macro base station 101 uses a band of 205 and the uplink of the macro base station uses a band of 207. On the other hand, the pico base station 103 may use a frequency band B of 203, where downlink may use 209 bands and uplink 211 bands.

At this time, the UE receives the downlink control channel and the data channel in 205 and 209 and transmits the uplink channel in FIGS. 207 and 211. When it is separated to the time side as shown in FIG.

FIG. 3 illustrates a transmission method on a time axis between downlink transmission and uplink transmission when a terminal using a frequency set uses different bandwidths from different cells.

Referring to FIG. 3, FIG. 3 shows that the downlink band of the first cell 101 is 301 and the uplink band is 305, and the downlink band of the second cell 103 is 303 and the uplink band is 307. Illustrate the case. In this case, the UE may receive a control channel for transmitting a downlink channel and an uplink data channel at 301 and 303. The UE can transmit the uplink data channel in 305 and 307 according to the scheduling, and the uplink response channel for the downlink data channel can be transmitted only in a predetermined band in FIGS. 305 and 307.

The predetermined cell is generally determined by the method of Pcell (Primary cell) and Scell (Secondary cell). When a base station accesses two or more cells, the network designates one of each cell as a Pcell and the other as an Scell. The control channel of the link is transmitted only to the Pcell.

For example, when the base station transmits a control channel for the downlink data channel and a control channel for the uplink data channel through the downlink subframe of block 309 of FIG. 3, the terminal transmits the downlink data channel to the same subframe. In block 309.

The UE transmits the uplink data channel after four subframes 313 in the subframe 309 that receives the control channel. The reason why the transmission time is required in the uplink is determined in consideration of the control channel demodulation and the data channel generation time. The downlink response channel for the uplink data channel transmitted in block 313 is transmitted in a fourth subframe 319 after the subframe 313 in which the uplink data channel is transmitted, which is also a demodulation time for the uplink data channel. Considered. In this case, if a control channel for a downlink data channel is transmitted in another downlink bandwidth 303, the terminal may transmit an uplink data channel in another uplink band as shown in block 315.

That is, in the case of an uplink response channel for the downlink data channel, a control channel for the downlink data channel may occur in at least one of the downlink band of the block 301 and the downlink band of the block 303. Regardless of the occurrence of the data channel, the response channel transmitted on the uplink is transmitted through one uplink band (PCell) as shown in block 317. This is to reduce power consumption of the terminal and to increase the interference between cells.

Existing system is designed to transmit the uplink control channel to the Pcell or one base station because the base station receiving 305 and 307 is one base station and one base station is configured to configure each cell in each bandwidth. Used the method.

However, in the system of FIG. 1 applied to the present invention, base stations receiving 305 and 307 are physically separated from each other, and two base stations are connected from one base station to another at a very fast time in real time using a slow communication network. Assume that it is very difficult to convey control channel information. In this case, if all of the transmission channels have very small transmission bandwidths and high-power transmission control channels, the control channels transmitted at each bandwidth cause intermodulation to each other, which is very large in a frequency band not used by the actual system. Problems arise that cause interference and interfere with the operation of other systems.

In order to solve this problem, the present invention proposes a transmission method that prevents simultaneous transmission during uplink transmission to a terminal to prevent interference due to intermodulation and at the same time obtains a maximum transmission rate in downlink.

In the proposed invention, the first base station has a first downlink band and a first uplink band, and the second base station has a second downlink band and a second uplink band, and the terminal has a first downlink band. This is a case where the downlink is received in the second downlink band and the first uplink band and the second uplink band can be transmitted.

The first base station instructs the terminal in the first resource and the second base station instructs the terminal in the second resource. The first resource is a set of subframes of the first uplink band that the terminal can use to transmit to the first base station. The second resource is a set of subframes of the second uplink band that the terminal can use to transmit to the second base station. In particular, according to the present invention, the first resource and the second resource are characterized in that they do not overlap with each other in time.

When the first base station and the second base station transmit a response channel for scheduling the downlink data channel, the terminal transmits a response channel for the downlink data channel received at the first base station to the second base station in the first resource. The response channel for the received downlink data channel is transmitted to the second resource.

In addition, the first resource and the second resource refers to a subframe index, and uplink subframes belonging to each resource collect and transmit response channels for data channels transmitted in a plurality of downlink subframes. In addition, the first resource and the second resource may be arranged in consideration of the synchronous transmission of the uplink data channel. Although the first resource and the second resource generally do not overlap in time, they may overlap depending on the location or distance of the first and second base stations.

The terminal may receive the first resource and the second resource through the following two methods. The first method is to receive both the first resource and the second resource through higher signaling or system information of the first base station when the terminal is connected to the first base station. Another method is for the terminal to receive the first resource through higher signaling or system information from the first base station and to receive the second resource from the second base station. That is, the terminal may receive all the signaling from one base station or from each base station according to whether each base station can transmit higher signaling to the terminal.

When the terminal receives the first resource and the second resource from the base station, the terminal is used to transmit a control channel (PUCCH) to transmit the first resource and the second resource to each base station. The response information for the data channel received in the first downlink band to be transmitted to the first base station or the information to be transmitted through the control channel is transmitted to the first resource. On the other hand, the response information for the data channel received in the second downlink band to be transmitted to the second base station or information to be transmitted through the control channel is transmitted to the second resource.

PUCCH formats 1 / 1a / 1b, 2 / 2a / 2b, and 3 may be used in the format of the control channel transmittable to the first resource and the second resource according to the type of information to be transmitted and the amount of information. In addition, regardless of the type and amount of information, one or a part of PUCCH formats 1 / 1a / 1b, 2 / 2a / 2b, and 3 may be designated and transmitted.

The first resource and the second resource may indicate non-contiguous subframes. In this case, the resource transmits response channels for a plurality of downlink data channels. In general, when any two adjacent subframes indicated by the first resource or the second resource are i and j and i is a subframe that precedes j, according to the present invention, the response channel to be transmitted to the subframe j is The number of downlink subframes to be included is k (ji = k), and the subframe index may be j-4-k + 1 in j-4.

For example, when the uplink subframe indexes indicated by the first resource are 2 and 5, i becomes 2, and j becomes 5, k becomes 3. In this case, according to the present invention, the response channel resource for the PUCCH transmitted in the j subframe is from downlink subframe 5-4 = 1 to 5-4-3 + 1 = -1, and the terminal 1, 0, The response channel for the three first subframes is transmitted.

A method of indicating the first resource and the second resource may use a bitmap method and may indicate an uplink HARQ process number in consideration of retransmission of an uplink data channel. The size of the bitmap can be 10bit or 80bit indicating 10msec and 80msec, and 8bit when indicating the HARQ process number.

In case of indicating 10 msec, the first resource and the second resource are repeated at a predetermined subframe position by indicating the first resource and the second resource in units of radio frames, while the disadvantage of not considering uplink data retransmission. have. In case of indicating 80msec, it can be indicated by considering uplink data retransmission transmitted at 8msec interval, but there is a big disadvantage.In case of indicating HARQ process number in 8bit, uplink data retransmission can be considered with less resources. There is an advantage.

The first resource and the second resource indicated by the first base station and the second base station may be set according to a resource division rule predetermined by the operator, but may be determined in advance through communication between the base stations of the first base station and the second base station. . In this case, the first base station and the second base station may transmit their preferred first resource and second resource and determine the first resource and the second resource through the response. Information exchanged by the base station exchanges the same information or corresponding information as the above-described higher signaling method. The following examples illustrate the method proposed by the invention in detail.

Figure 4 shows a first embodiment proposed in the present invention. The proposed first embodiment shows an example in which 8msec synchronous transmission of an uplink data channel and use of uplink resources of a first base station and a second base station are equally used.

4 shows that a first downlink band 401 and a first uplink band 405 are used by a first base station, and a second downlink band 403 and a second uplink band 407 are used by a second base station. This is the case. The terminal also transmits a control channel to the first resource 411 used for the first base station and the second resource 417 used for the second base station.

 In the first embodiment, the amount of data or resource to be transmitted to the first base station and the second base station is configured to be 1: 1, and the synchronous transmission method of the uplink data channel is considered. In case of considering synchronous transmission as 8msec, this means that one uplink data channel and retransmission for this data channel are performed at 8msec intervals.A control channel or a response channel with scheduling information for the data channel is transmitted at 4msec before and after the data channel. This is the case. In this case, if scheduling information for the uplink data channel is transmitted in the downlink data channel of FIG. 409, the data channel is generated in the subframe of FIG. 411 and the response channel is generated in the subframe of FIG. 421.

At this time, the control channel transmitted to the first resource is composed of two subframe intervals as shown in FIG. 411, which equally transmits response channels for a plurality of downlink data channels to the first resource. To distribute to In addition, when retransmission of the 8msec uplink data channel is considered, the allocation in a multiple of 2 is because the retransmission time point and the first resource can be set to overlap.

The number of downlink subframes included in the control channel transmitted to the first resource or the second resource is both two. For example, in case of the first resource of FIG. 412, the response channels for the two downlinks of FIGS. 414 and 415 are described. Will be sent.

5 shows a second embodiment proposed by the present invention. The proposed second embodiment shows an example of using 8msec synchronous transmission of an uplink data channel and using uplink resources of a first base station and a second base station in a 1: 3 manner.

5 shows that the first downlink band 501 and the first uplink band 505 are used by the first base station, and the second downlink band 503 and the second uplink band 507 are represented by the second base station. This is the case. The terminal also transmits a control channel to the first resource 517 used for the first base station and the second resource 515 used for the second base station.

In the second embodiment, the amount of data or resource to be transmitted to the first base station and the second base station is configured to be 1: 3, and the synchronous transmission method of the uplink data channel is considered. In case of considering synchronous transmission as 8msec, this means that one uplink data channel and retransmission for this data channel are performed at 8msec intervals.A control channel or a response channel with scheduling information for the data channel is transmitted at 4msec before and after the data channel. This is the case.

In this case, if scheduling information for the uplink data channel is transmitted in the downlink data channel of FIG. 509, the data channel is generated in the subframe of FIG. 517 and the response channel is generated in the subframe of FIG. 519.

At this time, the control channel transmitted to the first resource is composed of four subframe intervals as shown in FIG. 517. In consideration of retransmission of the 8msec uplink data channel, the control channel is allocated in multiples of two. Because it can. In case of the second resource, three consecutive subframe resources are repeated. In this case, the subframe transmitting the response channel for the plurality of downlink subframes is only a subframe having a distance from other second resources as shown in FIG. Yes. Accordingly, FIG. 515 may transmit response channels for a total of two downlink subframes.

On the other hand, when there is no gap with the previous subframe in the subframe indicated by the second resource, a response channel for one downlink subframe is transmitted. 5 is an example of allocation in the case where a higher transmission rate can be guaranteed to the second base station. If the terminal is close to the second base station and can transmit at a lower transmission power, the terminal should ensure that the resources of the second base station are used to ensure a higher transmission rate, and in this case, the first base station may release less resources. Instruct resources 1 and the base station 2 instructs resources more.

Figure 6 shows a third embodiment proposed in the present invention. The proposed third embodiment shows an example in which 10msec synchronous transmission of an uplink data channel and uplink resources of a first base station and a second base station are used 1: 4.

6 shows that the first downlink band 601 and the first uplink band 611 are used by the first base station, and the second downlink band 603 and the second uplink band 613 are the second base station. This is the case. The terminal also transmits a control channel to the first resource 615 used for the first base station and the second resource 617 used for the second base station. In the third embodiment, the amount of data or resource to be transmitted to the first base station and the second base station is configured to be 1: 4, and the 10msec synchronous transmission method of the uplink data channel is considered.

In case of considering synchronous transmission as 10msec, it means that one uplink data channel and retransmission for this data channel are performed at 10msec intervals.A control channel or a response channel with scheduling information for the data channel is transmitted at 5msec before and after the data channel. This is the case. In this case, if scheduling information for the uplink data channel is transmitted in the downlink data channel of FIG. 605, the data channel is generated in the subframe of FIG. 615 and the response channel is generated in the subframe of FIG. 619.

At this time, the control channel transmitted to the first resource is composed of five subframe intervals as shown in FIG. 615. In consideration of retransmission of the 10msec uplink data channel, the control channel is allocated to a multiple of 5. Because it can. In case of the second resource, four consecutive subframe resources are repeated. In this case, the subframe transmitting the response channel for the plurality of downlink subframes is only a subframe having a distance from other second resources as shown in FIG. 617. Yes.

Accordingly, FIG. 617 may transmit response channels for a total of two downlink subframes. On the other hand, when there is no gap with the previous subframe in the subframe indicated by the second resource, a response channel for one downlink subframe is transmitted. 6 is an example of allocation in the case where a higher transmission rate can be guaranteed to the second base station.

If the terminal is close to the second base station and can transmit at a lower transmission power, the terminal should ensure that the resources of the second base station are used to ensure a higher transmission rate, and in this case, the first base station may release less resources. Instruct resources 1 and the base station 2 instructs resources more. In addition, the first resource may be configured based on 10msec retransmission and may maintain subframes of the first resource and the second resource at the same location in units of radio frames.

7 shows a fourth embodiment proposed by the present invention. The proposed fourth embodiment is a case where the first uplink used by the first base station and the second uplink used by the second base station use the same band, and the 8msec synchronous transmission of the uplink data channel and the first base station An example of using the uplink resource of the second base station in 1: 3 is shown.

7 shows that the first downlink band 701 and the first uplink band 709 are used by the first base station, and the second downlink band 702 and the first uplink band 709 are the second base station. This is the case. In addition, the terminal transmits a control channel to the first resource 711 used for the first base station and the second resource 713 used for the second base station. In the fourth embodiment, the first resource and the second resource are resources that do not overlap each other, but use the same uplink band 709.

In the fourth embodiment, the amount of data or resources transmitted to the first base station and the second base station is configured to be 1: 3, and the synchronous transmission method of the uplink data channel is considered. In case of considering synchronous transmission as 8msec, this means that one uplink data channel and retransmission for this data channel are performed at 8msec intervals.A control channel or a response channel with scheduling information for the data channel is transmitted at 4msec before and after the data channel. This is the case.

In this case, if scheduling information for the uplink data channel is transmitted in the downlink data channel of FIG. 703, the data channel is generated in the subframe of FIG. 711 and the response channel is generated in the subframe of FIG. 715. At this time, the control channel transmitted to the first resource is composed of four subframe intervals as shown in FIG. 711. In consideration of retransmission of the 8msec uplink data channel, the control channel is allocated in multiples of two. Because it can.

In case of the second resource, three consecutive subframe resources are repeated. In this case, a subframe transmitting a response channel for a plurality of downlink subframes is only a subframe having a distance from another second resource as shown in FIG. Yes. Accordingly, FIG. 713 may transmit response channels for a total of two downlink subframes. On the other hand, when there is no gap with the previous subframe in the subframe indicated by the second resource, a response channel for one downlink subframe is transmitted.

The fourth embodiment is a technology in which two base stations at different locations use one uplink band separated from each other on a time axis, and is configured through coordination between base stations in advance, and the terminal is assigned to each base station based on the first resource and the second resource. The power of the transmitted signal and the control channel information are separated and transmitted to each base station. In this case, the UE can secure the maximum transmission rate while scheduling the first downlink band and the second downlink band through each base station, and can also maintain the maximum transmission rate.

8 illustrates a method for determining the amount of information of a control channel resource proposed by the present invention.

Referring to FIG. 8, the terminal acquires information of the first resource 813 and the second resource 815, and the first terminal in the downlink band 809 of one of the first downlink band and the second downlink band. In case of receiving the scheduling of the resource 813 and the scheduling of the second resource 815 in another downlink band, as shown in FIG. 817, transmission of a plurality of downlink subframes is required at one control channel transmission time.

However, even when the base station transmits downlink scheduling information in FIGS. 801, 803, 805, and 807, if the terminal fails to demodulate the control channel, it is not known whether the transmission is actually performed, and thus, the resource of the control channel transmitted through the terminal in FIG. The amount of information may also be different from the amount assumed by the terminal and transmitted by the base station.

Accordingly, the base station may indicate a number of control channels transmitted now by adding a downlink allocation indicator (DAI) to the control channel. If the first control channel is transmitted in FIG. 801 and not in FIG. 803, the base station instructs the terminal to the control channel of FIG. 801 as DAI = 1 and in FIG. 803, the base station determines DAI = 1.

If addition to FIGS. 805 and 807 occurs in the control channel, DAI = 2 in FIG. 805 and DAI = 3 in FIG. 807 according to the number thereof. The indication of the DAI may be expressed by the number of control channels actually transmitted, and may also be indicated by a representative value corresponding thereto. For example, if one control channel is generated, DAI = 0, two are generated, DAI = 1, three are generated, DAI = 2, and four are generated, DAI = 3. In addition, if there are even control channels, DAI = 0, and if odd control, DAI = 1, it is possible to indicate about 2bit.

9 is a flowchart illustrating the operation of a base station according to an embodiment of the present invention.

Referring to FIG. 12, in step 901, a base station transmits information on a first resource and a second resource, which are transmission information on a first uplink band and a second uplink, to a terminal. The first base station and the second base station transmit the scheduling information for the first downlink and the second downlink, respectively, to each downlink. Thereafter, in step 905, the first base station receives an uplink control channel from the first resource and the second base station receives an uplink control channel from the second resource. The received control channel includes uplink response information for a plurality of predefined downlink data transmissions.

10 is a flowchart illustrating an operation of a terminal according to an embodiment of the present invention.

Referring to FIG. 10, in step 1001, a terminal receives a first resource for a first uplink band from a first base station and a second resource for a second uplink band from a second base station.

In step 1003, the control channel and the data channel are received in the first downlink and the second downlink transmitted from each base station, and the data channel is transmitted in the first uplink and the second uplink band based on the received control channel.

In step 1005, the terminal transmits an uplink control channel from the first resource to the first base station and transmits an uplink control from the second resource to the control channel in the first uplink band and the second uplink band. By transmitting the channel, each control channel is transmitted including a response channel for the data channel transmitted in the plurality of downlink subframes.

11 is a diagram illustrating a base station apparatus according to an embodiment of the present invention.

Referring to FIG. 11, the base station controller 1103 transmits a control channel and a data channel to the terminal using the transmitter of the device 1107 using the modulator 1101, and the base station controller 1103 transmits the control channel to the terminal in uplink. A resource region that can be received is configured and transmitted to the terminal through the modulator 1101 to the transmitter 1107. Accordingly, the base station activates the reception device 1113 at the point of time instructing the terminal, demodulates the signal of the terminal using the demodulator of the device 1111, and detects the control channel information transmitted by the terminal through the control channel receiver of FIG. 1105. Use to figure out. The detector determines the information based on the resource information and the resource amount of the control channel included in the control channel based on the information of the controller of FIG. 1103.

12 is a diagram illustrating a terminal device according to an embodiment of the present invention.

Referring to FIG. 12, the controller 1203 of the terminal demodulates a signal received using the terminal receiver 1213 through a demodulator 1211 and determines scheduling information through the control channel receiver of FIG. 1205. Thereafter, the DL data channel is received through FIG. 1209. In addition, the base station receives resource information to be transmitted uplink through the receiver of FIG. 1213 through the receiver of FIG. 1213 and receives it through the data channel of FIG. 1209 based on the control channel receiver of FIG. 1205. Based on this, the controller of FIG. 1203 determines the transmission time of the uplink response channel and determines the resource amount of the response channel based on the received control channel information of FIG. 1205. A control channel is configured through the control channel generator of FIG. 1201 and transmitted to the base station through the transmitter of FIG. 1207.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

101: macro base station
103: pico base station
107: terminal
1101: modulator of base station
1103: control unit of the base station
1105: control channel receiver of base station
1107: transmitting unit of the base station
1109: the decanter part of the base station
1111: demodulator of the base station
1113: receiving unit of the base station
1201: terminal
1203: control unit of the terminal
1205: control channel receiver of the terminal
1207: transmitting unit of the terminal
1209: data channel receiver of terminal
1211: demodulation unit of the terminal
1213: receiving unit of the terminal

Claims (18)

In a wireless communication system that supports frequency combining for at least one or more base stations, the terminal transmits an uplink channel to the base station,
Receiving a first downlink channel from a first base station, and receiving a second downlink channel from a second base station; And
Transmitting an uplink channel for the first downlink channel to the first base station through a first resource, and transmitting an uplink channel for the second downlink channel to the second base station through a second resource. Including;
And the subframe of the first resource and the subframe of the second resource do not exist on the same time axis. The method of claim 1,
The subframe of the first resource and the second resource includes a response to at least one downlink subframe. The method of claim 2, wherein before receiving the downlink channel,
And receiving the first resource allocation information from the first base station, and receiving the second resource allocation information from the second base station. The method of claim 3, wherein
When the first resource and the second resource are configured according to an 8mesec synchronous transmission scheme, and the amount of the first resource and the second resource is 1: 3, the first resource is divided into one subframe at 4msec intervals. And the second resource includes three subframes at 4msec intervals. The method of claim 3, wherein
When the first resource and the second resource are configured according to an 8mesec synchronous transmission scheme, and the amount of the first resource and the second resource is 1: 1, the first resource is divided into one subframe at 2msec intervals. And the second resource includes one subframe at 2 msec intervals. The method of claim 3, wherein
When the first resource and the second resource are configured according to a 10mesec synchronous transmission scheme, and the amount of the first resource and the second resource is 1: 4, the first resource is divided into one subframe at 5msec intervals. And the second resource includes four subframes at 5msec intervals. 5. The method of claim 4,
The subframe of the first resource includes a response to four subframes transmitting the first downlink channel, and the subframe of the second resource is assigned to two subframes transmitting the second downlink channel. The transmission method, characterized in that it can include a maximum response. 6. The method of claim 5,
The subframe of the first resource includes a response to two subframes transmitting the first downlink channel, and the subframe of the second resource is assigned to two subframes transmitting the second downlink channel. And a response to the transmission. The method according to claim 6,
The subframe of the first resource includes a response to five subframes transmitting the first downlink channel, and the subframe of the second resource is assigned to two subframes transmitting the second downlink channel. The transmission method, characterized in that it can include a maximum response. In a wireless communication system supporting frequency combining for at least one base station, the terminal for transmitting an uplink channel to the base station,
A transceiver for transmitting and receiving a signal with a first base station or a second base station; And
Receives a first downlink channel from the first base station, receives a second downlink channel from the second base station, and transmits an uplink channel for the first downlink channel to the first base station through a first resource. And a control unit for controlling to transmit an uplink channel for the second downlink channel to the second base station through a second resource.
The subframe of the first resource and the subframe of the second resource is characterized in that the terminal does not exist on the same time axis The method of claim 10,
The subframe of the first resource and the second resource comprises a response to at least one downlink subframe. 12. The apparatus according to claim 11,
And receiving the first resource allocation information from the first base station and receiving the second resource allocation information from the second base station. 13. The method of claim 12,
When the first resource and the second resource are configured according to an 8mesec synchronous transmission scheme, and the amount of the first resource and the second resource is 1: 3, the first resource is divided into one subframe at 4msec intervals. And the second resource includes three subframes at 4msec intervals. 13. The method of claim 12,
When the first resource and the second resource are configured according to an 8mesec synchronous transmission scheme, and the amount of the first resource and the second resource is 1: 1, the first resource is divided into one subframe at 2msec intervals. And the second resource includes one subframe at 2 msec intervals. 13. The method of claim 12,
When the first resource and the second resource are configured according to a 10mesec synchronous transmission scheme, and the amount of the first resource and the second resource is 1: 4, the first resource is divided into one subframe at 5msec intervals. And the second resource includes four subframes at 5msec intervals. 14. The method of claim 13,
The subframe of the first resource includes a response to four subframes transmitting the first downlink channel, and the subframe of the second resource is assigned to two subframes transmitting the second downlink channel. Terminals, characterized in that it can include a maximum response. The method of claim 14,
The subframe of the first resource includes a response to two subframes transmitting the first downlink channel, and the subframe of the second resource is assigned to two subframes transmitting the second downlink channel. And a response to the terminal. 16. The method of claim 15,
The subframe of the first resource includes a response to five subframes transmitting the first downlink channel, and the subframe of the second resource is assigned to two subframes transmitting the second downlink channel. Terminal which can include a response to the maximum

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