WO2014003385A1

WO2014003385A1 - Method and apparatus for transmitting/receiving uplink signal in inter-base station frequency integration system

Info

Publication number: WO2014003385A1
Application number: PCT/KR2013/005541
Authority: WO
Inventors: 지형주; 노상민; 조준영; 김영범; 최승훈
Original assignee: 삼성전자 주식회사
Priority date: 2012-06-27
Filing date: 2013-06-24
Publication date: 2014-01-03
Also published as: KR20140001461A

Abstract

The present invention relates to a method and apparatus for transmitting from a terminal, without channel cross modulation, an uplink signal including feedback required for the scheduling of each base station to different base stations, when cooperation between base stations is slow in an inter-base station frequency integration system. According to the present invention, the method for transmitting an uplink channel from a terminal to a base station comprises the steps of: a first base station or a second base station receiving first resource allocation information and second resource allocation information; receiving a first downlink channel from the first base station and receiving a second downlink channel from the second base station; and transmitting an uplink channel for the first downlink channel to the first base station through a first resource according to the first resource allocation information, and transmitting an uplink channel on the second downlink channel to the second base station through a second resource according to the second resource allocation information, wherein the subframe of the first resource and the subframe of the second resource do not lie on the same time axis. Also, the method according to the present invention by which a base station receives an uplink channel from a terminal comprises the steps of: transmitting resource allocation information including at least one of first resource allocation information on an uplink channel transmitted to a first base station or second resource allocation information on an uplink channel transmitted to a second base station; transmitting a first downlink channel; and receiving an uplink channel on the first downlink channel through a first resource according to the first resource allocation information, wherein the subframe of the first resource and the subframe of a second resource in accordance with the second resource allocation information do not lie on the same time axis. According to the present invention, the occurrence of cross modulation between mutually different frequency bandwidths can be prevented, and a terminal can simultaneously transmit and receive different bandwidths to and from different base stations in a downlink and an uplink, so as to increase the maximum transmission rate of the terminal.

Description

Uplink signal transmission / reception method and apparatus in base station frequency integration 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, mobile communication systems are gradually expanding not only voice but also data services, and now they have developed to the extent that they can provide high-speed data services. However, in the mobile communication system where a service is currently provided, a more advanced mobile communication system is required due to a shortage of resources and high speed service demands 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, the method for transmitting an uplink channel to the base station by the terminal according to the present invention comprises the steps of receiving the first resource allocation information and the second resource allocation information from the first base station or the second base station, Receiving a first downlink channel from a first base station, receiving a second downlink channel from the second base station, and uplink to the first downlink channel through a first resource according to the first resource allocation information. Transmitting a channel to the first base station, and transmitting an uplink channel for the second downlink channel to the second base station through a second resource according to the second resource allocation information. The subframe of the 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 transmitting an uplink channel to a base station includes a transceiver for transmitting and receiving a signal with a first base station or a second base station, and first resource allocation information and a second resource from the first base station or the second base station. Receiving resource allocation information, receiving a first downlink channel from the first base station, receiving a second downlink channel from the second base station, and receiving the first resource through the first resource according to the first resource allocation information. 1 transmits an uplink channel for a downlink channel to the first base station, and transmits an uplink channel for the second downlink channel to the second base station through a second resource according to the second resource allocation information. And a control unit for controlling, wherein the subframe of the first resource and the subframe of the second resource do not exist on the same time axis. The.

According to the present invention, a method for receiving an uplink channel from a terminal by a base station includes: first resource allocation information for an uplink channel to be transmitted to a first base station or second resource allocation information for an uplink channel to be transmitted to a second base station; Transmitting resource allocation information including at least one of the following, transmitting a first downlink channel, and receiving an uplink channel for the first downlink channel through a first resource according to the first resource allocation information And a subframe of the first resource and a subframe of the second resource according to the second resource allocation information do not exist on the same time axis.

And, according to the present invention, the base station receiving the uplink channel from the terminal, the first resource allocation information or the second base station for the transmission and reception unit for transmitting and receiving signals with the terminal or the second base station and the uplink channel to be transmitted to the first base station Transmitting resource allocation information including at least one of second resource allocation information for an uplink channel to be transmitted, transmitting a first downlink channel, and transmitting the first downlink through a first resource according to the first resource allocation information And a control unit controlling to receive an uplink channel for the link channel, wherein the subframe of the first resource and the subframe of the second resource according to the second resource allocation information do not exist 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 connected to a terminal.

3 is a diagram illustrating an uplink transmission method in a frequency aggregation communication system.

4 is a diagram illustrating uplink transmission according to the first embodiment of the present invention.

5 is a diagram illustrating uplink transmission according to the second embodiment of the present invention.

6 is a diagram illustrating uplink transmission according to the third embodiment of the present invention.

7 is a diagram illustrating uplink transmission according to the fourth embodiment of the present invention.

8 is a diagram illustrating 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 an operation of a terminal according to an embodiment of the present invention.

11 is a diagram illustrating 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.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed descriptions of related 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.

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. Resources on the time axis are divided into different OFDM symbols and they are orthogonal to each other. Resources on the frequency axis are divided into 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 that transmits modulation symbols that modulate 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 becomes 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, and is used for channel estimation, feedback information configuration of the terminal, or demodulation of the control channel and data channel. DMRS is also used for data channel demodulation and channel estimation of a specific terminal as a reference signal transmitted over the entire downlink band, and unlike CRS, it is not used for configuring feedback information. Accordingly, the DMRS is transmitted through a PRB resource to be scheduled by the terminal.

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 to quickly receive and demodulate the control channel signal. In addition, the PDCCH region is located over the entire downlink band, in which one control channel is divided into control channels of a small unit 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 with high frequency power for wide coverage, and when additional bandwidth is available, a low power pico base station such as 103 is provided. Will be installed. In this case, a frequency band different from that used by the macro base station 101 may be used for the 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 the existing system, a system design capable of fast inter-base station X2 communication 105 between a base station of 103 picocells and a macro cell of 101 is possible. However, when a large number of picocells occur, such communication may be impossible or very slow. In this case, the network allows transmission and reception of different base stations using different frequency bands in order to improve performance of one terminal, but it is impossible for one base station to schedule a frequency band used by another base station.

If there is no fast enough inter-base station communication 105, each base station should perform a separate scheduling for each frequency band used by the terminal. 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 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 the

bands

205 and 209 and transmits the uplink channel in the

bands

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 an uplink data channel in 305 and 307 according to scheduling, and an uplink response channel for the downlink data channel can be transmitted only in a predetermined band among 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. At this time, if the control channel for the downlink data channel is also transmitted in the other downlink bandwidth 303, the terminal may transmit the 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.

In the existing system, since the base station receiving 305 and 307 is one base station and one base station configures each cell in each bandwidth, a method of always transmitting an uplink control channel to a Pcell or one base station is required. Used.

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 control a channel from one base station to another base station at a very fast time in real time using a slow communication network. Assume that it is very difficult to convey 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 downlink is received in the second downlink band and the uplink may be transmitted in the first uplink band and the second uplink band.

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 subframe set of the first uplink band that the terminal can use for transmitting uplink to the first base station. The second resource is a subframe set of the second uplink band that the terminal can use to transmit an uplink 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 409, the data channel is generated in a subframe of 411, and the response channel is generated in the subframe of 421.

At this time, the control channel transmitted to the first resource is composed of two subframe intervals as shown in 411, which equally applies to each control channel in transmitting response channels for a plurality of downlink data channels to the first resource. This is for distribution. In consideration of retransmission of the 8msec uplink data channel, allocating a control channel transmitted to the first resource in multiples of 2 may set the retransmission time point and the first resource to overlap each other.

The number of downlink subframes included in the control channel transmitted to the first resource or the second resource is both two. For example, when 412 is the first resource, the response channels for two

downlinks

414 and 415 are transmitted. do.

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 base station uses the first downlink band 501 and the first uplink band 505, and the second base station uses the second downlink band 503 and the second uplink band 507. 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 509, the data channel occurs in subframe of 517 and the response channel occurs in subframe of 519.

At this time, the control channel transmitted to the first resource is composed of four subframe intervals as shown in 517. Considering retransmission of the 8msec uplink data channel, it is retransmitted to allocate the control channel transmitted to the first resource in multiples of two. This is because the viewpoint and the first resource can be set to overlap. In the 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 another second resource, such as 515. do. Accordingly, 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 higher transmission rates. In this case, the first base station directs less resources to the first resource and the second base station directs more resources to the second resource.

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 base station uses the first downlink band 601 and the first uplink band 611, and the second base station uses the second downlink band 603 and the second uplink band 613. 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 605, the data channel is generated in subframe 615 and the response channel is generated in the subframe of 619.

At this time, the control channel transmitted to the first resource is composed of five subframe intervals as shown in 615. Considering retransmission of the 10msec uplink data channel, assigning a control channel transmitted to the first resource in multiples of 5 is retransmitted. This is because the viewpoint and the first resource can be set to overlap. 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 another second resource such as 617. do.

Accordingly, the 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 higher transmission rates. In this case, the first base station directs less resources to the first resource and the second base station directs more resources to the second resource. 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 base station uses the first downlink band 701 and the first uplink band 709, and the second base station uses the second downlink band 702 and the first uplink band 709. 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 703, the data channel is generated in a subframe of 711 and the response channel is generated in a subframe of 715. At this time, the control channel transmitted to the first resource is composed of four subframe intervals as shown in 711. Considering retransmission of the 8msec uplink data channel, assigning the control channel transmitted to the first resource in multiples of 2 is the point of retransmission. This is because the first resource can be set to overlap each other.

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 another second resource, such as 713. do. Accordingly, 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 technique in which two base stations at different locations use one uplink band separately from each other on a time axis, and is configured through cooperation between base stations in advance. The terminal separates the power of the signal transmitted to each base station and the control channel information based on the first resource and the second resource and transmits the information to each base station. In this case, the terminal can secure the maximum transmission rate by scheduling the first downlink band and the second downlink band through each base station, and can maintain the maximum transmission rate.

The first resource and the second resource proposed by the present invention are configured using HARQ timing of an uplink data channel. However, the indication of the base station may include transmitting to the terminal on a bitmap basis. For example, in the case of indicating a bitmap of 40 bits in total, a preferred transmission method according to the present invention considers 8msec retransmission, and 40bits of bits indicating a corresponding resource for 40 contiguous subframes of the corresponding subframe. It can be configured to indicate to the terminal. In addition, the uplink subframes indicated by the first resource and the second resource need not include all of the continuous time that the UE uses for transmission of the uplink subframe.

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. When receiving the scheduling of the resource 813 and the scheduling of the second resource 815 in another downlink band, transmission of a plurality of downlink subframes is required at one control channel transmission time, as shown in 817.

However, even if the base station transmits downlink scheduling information at 801, 803, 805, and 807, if the terminal fails to demodulate the control channel, it is not known whether the transmission is actually performed. Accordingly, the amount of resource information of the control channel transmitted through the 817 is The amount assumed and transmitted by the terminal may be different from the amount assumed and received 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 at 801 and not at 803, the base station instructs the terminal to the control channel of 801 as DAI = 1 and at 803 the base station determines DAI = 1.

If control channels occur at 805 and 807, addition of DAI indicates DAI = 2 at 805 and DAI = 3 at 807 according to the number of control channels. 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.

Referring to FIG. 9, in step 901, a first base station and a second base station transmit 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.

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 by 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 a control channel in a first uplink band and a second uplink band, and transmits an uplink control channel from a first resource to a first base station and an uplink from a second resource to a second base station. The link control channel is transmitted to transmit each control channel including a response channel for data channels transmitted in a 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 modulates the control channel and the data channel using the modulator 1101 and transmits the control channel and the data channel to the terminal using the transmitter 1107. The base station controller 1103 configures a resource region that can be received from the terminal in uplink and transmits the resource region to the transmitter 1107 through the modulator 1101. Accordingly, the base station activates the receiver 1113 at the point of time instructing the terminal, demodulates the signal of the terminal using the demodulator 1111, and detects the control channel 1109 transmitted by the terminal through the control channel receiver 1105. Use it to figure out. The detector 1109 determines 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 1103.

Meanwhile, in the above description, the base station is composed of a plurality of blocks, and each block performs a different function. However, this is only an example and is not necessarily limited thereto.

More specifically, a transceiver including a transmitter 1107 and a receiver 1113 may transmit and receive a signal with a terminal or another base station.

In addition, the control unit including the base station controller 1103 transmits resource allocation information including at least one of the first resource allocation information or the second resource allocation information, transmits the first downlink channel, and through the first resource It may be controlled to receive an uplink channel for the first downlink channel.

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 receiver 1213 through a demodulator 1211 and determines scheduling information through a downlink control channel receiver 1205. . The downlink data channel receiver 1209 receives the downlink data channel. In addition, the base station receives resource information to be transmitted uplink through the receiver 1213 from the base station and receives the data channel through the downlink data channel receiver 1209 based on the downlink control channel receiver 1205. Based on this, the controller 1203 determines a transmission time of the uplink response channel, and determines a resource amount of the response channel based on the control channel information received by the downlink control channel receiver 1205. The control channel is configured through the control channel generator 1201 and transmitted to the base station through the transmitter 1207.

Meanwhile, in the above description, the terminal is composed of a plurality of blocks and each block performs a different function. However, this is only an example and is not necessarily limited thereto.

More specifically, the transceiver including the transmitter 1207 and the receiver 1213 may transmit and receive signals with the base station.

The controller including the controller 1203 may control to receive the first resource allocation information from the first base station and to receive the second resource allocation information from the second base station. The controller may control to receive the first downlink channel from the first base station and to receive the second downlink channel from the second base station. The control unit may control to transmit the uplink channel for the first downlink channel to the first base station through the first resource and to transmit the uplink channel for the second downlink channel to the second base station through the second resource. have.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

Claims

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 first resource allocation information and second resource allocation information from the first base station or the second base station;

Receiving a first downlink channel from the first base station and receiving a second downlink channel from the second base station; And

The uplink channel for the first downlink channel is transmitted to the first base station through the first resource according to the first resource allocation information, and the second downlink is transmitted through the second resource according to the second resource allocation information. Transmitting an uplink channel for a link channel to the second base station,

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,

And the subframes of the first resource and the second resource include responses to at least one downlink subframe.
The method of claim 1,

When the first resource and the second resource are configured according to an 8msec 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 1,

When the first resource and the second resource are configured according to an 8msec 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 intervals of 2 msec.
The method of claim 1,

When the first resource and the second resource are configured according to a 10msec 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.
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,

Transmitting and receiving unit for transmitting and receiving a signal with a first base station or a second base station; And

Receiving first resource allocation information and second resource allocation information from the first base station or the second base station, receiving a first downlink channel from the first base station, and receiving a second downlink channel from the second base station. Receiving, transmitting an uplink channel for the first downlink channel to the first base station through a first resource according to the first resource allocation information, and transmitting the second uplink channel through the second resource according to the second resource allocation information. It includes a control unit for controlling to transmit the uplink channel for the second downlink channel to the second base station,

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 6,

The subframe of the first resource and the second resource comprises a response to at least one downlink subframe.
The method of claim 6,

When the first resource and the second resource are configured according to an 8msec 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 6,

When the first resource and the second resource are configured according to an 8msec 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 6,

When the first resource and the second resource are configured according to a 10msec 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.
In a wireless communication system that supports frequency combining for at least one or more base stations, in a method in which a first base station receives an uplink channel from a terminal,

Transmitting resource allocation information including at least one of first resource allocation information for an uplink channel to be transmitted to a first base station or second resource allocation information for an uplink channel to be transmitted to a second base station;

Transmitting a first downlink channel; And

Receiving an uplink channel for the first downlink channel through a first resource according to the first resource allocation information,

The subframe of the first resource and the subframe of the second resource according to the second resource allocation information do not exist on the same time axis.
The method of claim 11,

The subframe of the first resource and the second resource includes a response to at least one downlink subframe.
The method of claim 11,

When the first resource and the second resource are configured according to an 8msec 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 11,

When the first resource and the second resource are configured according to an 8msec 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 11,

When the first resource and the second resource are configured according to a 10msec 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.
A wireless communication system supporting frequency combining for at least one or more base stations, the first base station receiving an uplink channel from a terminal,

Transmitting and receiving unit for transmitting and receiving a signal with a terminal or a second base station; And

Transmitting resource allocation information including at least one of first resource allocation information for the uplink channel to be transmitted to the first base station or second resource allocation information for the uplink channel to be transmitted to the second base station; A control unit for transmitting and controlling an uplink channel for the first downlink channel through a first resource according to the first resource allocation information;

And the subframe of the first resource and the subframe of the second resource according to the second resource allocation information do not exist on the same time axis.
The method of claim 16,

And a subframe of the first resource and the second resource includes a response to at least one downlink subframe.
The method of claim 16,

When the first resource and the second resource are configured according to an 8msec 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 comprises three subframes at 4 msec intervals.
The method of claim 16,

When the first resource and the second resource are configured according to an 8msec 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 16,

When the first resource and the second resource are configured according to a 10msec 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.