KR20150128389A - Method for carrier aggregation in wireless communication system - Google Patents

Abstract

The present invention relates to a method for aggregating a paired component carrier and an unpaired component carrier. The cross carrier aggregation method according to an embodiment of the present invention enables a first device to transmit control information, for indicating a link resource to be assigned in a sub-frame of the unpaired component carrier, to a second device via a physical downlink control channel (PDCCH) included in a sub-frame of a downlink component carrier among the paired component carrier, and enables the first device or the second device to transmit data using the sub-frame in which the link resource is indicated to be assigned by the control information to each other.

Description

≪ Desc / Clms Page number 1 > METHOD FOR CARRIER AGGREGATION IN WIRELESS COMMUNICATION SYSTEM In a wireless communication system,

The present invention relates to a carrier aggregation method in a wireless communication system, and more particularly to a method of aggregating a paired component carrier and an unpaired component carrier.

Background of the Invention As wireless communication technology advances, there is an increasing need to use a wider bandwidth in a wireless communication system in order to increase the data transmission rate. Accordingly, the 3rd Generation Project Partnership (LTE-A) (Long Term Evolution Advanced) Release 10 introduces a carrier aggregation method using a plurality of element carriers. Carrier aggregation in 3GPP LTE Release 10 means that a terminal transmits and receives data to a plurality of element carriers.

Currently, in 3GPP LTE, carrier aggregation between element carriers for FDD (Frequency Division Duplexing) and carrier aggregation between element carriers for TDD (Time Division Duplexing) are supported. However, carrier aggregation between FDD element carriers and TDD element carriers, Carrier aggregation between element carriers and unlicensed spectrum is not supported.

On the other hand, currently commercialized mobile communication systems are mostly operated as FDD, and a wireless operator operates a system using a duplex element carrier divided into downlink and uplink frequencies. However, in order to further increase the system capacity, it is necessary to assemble more element carriers, and currently, a double-side spectrum for carrier aggregation between double-sided element carriers is limited. Therefore, there is a need to utilize a TDD cross-sectional element carrier or an exemption band frequency.

Various embodiments of the present invention provide a carrier aggregation method for aggregating a single-sided element carrier in a double-sided element carrier using only a transceiver for an FDD in a terminal or a base station in a system using a double-sided element carrier.

The cross-carrier aggregation method according to an embodiment of the present invention is characterized in that the first device is connected to a sub-frame of a one-sided element carrier via a physical downlink control channel (PDCCH) included in a sub- The first device or the second device can transmit data by using the subframe in which the link resource allocation is instructed by the control information to the first device or the second device, have.

In the cross-carrier aggregation method according to another embodiment of the present invention, the cross-sectional element carrier may use the license-exempt frequency band.

Also, in the cross carrier aggregation method according to another embodiment of the present invention, the control information may indicate downlink resource allocation (DL-Grant) or uplink resource allocation (UL-Grant).

In addition, in the cross carrier aggregation method according to another embodiment of the present invention, when the control information indicates the downlink resource allocation, the data is included in the subframe in which the downlink resource allocation is indicated, And the subframe in which the downlink resource allocation is instructed may be a subframe transmitted at the same time as the subframe including the control information.

Also, in the cross carrier aggregation method according to another embodiment of the present invention, the subframe in which the downlink resource allocation is instructed includes a Physical Downlink Shared Channel (PDSCH), and the data includes the physical downlink shared channel Lt; / RTI >

Also, in the cross carrier aggregation method according to another embodiment of the present invention, when the control information indicates the uplink resource allocation, the data is included in the subframe in which the uplink resource allocation is instructed, And the subframe in which the uplink resource allocation is instructed may be transmitted after a predetermined subframe after the subframe including the control information. In addition, the predetermined subframe may be four subframes.

In the cross-carrier aggregation method according to another embodiment of the present invention, the subframe in which the uplink resource allocation is instructed includes a Physical Uplink Shared Channel (PUSCH), and the data includes the physical uplink shared channel Lt; / RTI >

In the cross-carrier aggregation method according to another embodiment of the present invention, the control information includes first control information and second control information, and the first control information includes a first sub- Wherein the second control information indicates an uplink resource allocation to a second subframe of the one-sided elementary carrier, and when the first subframe and the second subframe are adjacent to each other, The first sub-frame may include a guard interval.

In the cross-carrier aggregation method according to another embodiment of the present invention, the control information includes first control information and second control information, and the first control information includes a first sub- Wherein the second control information indicates an uplink resource allocation to a second subframe of the one-sided elementary carrier, and when the first subframe and the second subframe are adjacent to each other, The second sub-frame may include a guard interval.

According to the cross carrier aggregation method according to various embodiments of the present invention, since the control information is transmitted through the double-sided element carrier for the FDD and the data is transmitted through the double-sided element carrier for the FDD and the single-sided element carrier for the TDD, The transmission rate can be increased. Also, since the control information uses only DCI format (Downlink Control Information format) for FDD, the BS and the UE can perform cross carrier aggregation using an FDD transceiver that is provided without having a dual mode transceiver.

Fig. 1 shows a conceptually illustrated double-sided element carrier for FDD and a single-sided element carrier for TDD.
Fig. 2 shows a frame structure of a double-sided element carrier for FDD and a single-sided element carrier for TDD in a conceptually illustrated wireless communication system.
3A and 3B show an environment in which a cross carrier aggregation method according to an embodiment of the present invention is performed.
Figure 4 shows a frame of an element carrier on which cross carrier aggregation is performed in accordance with an embodiment of the present invention.
5A and 5B illustrate a guard interval included in a subframe of a TDD sectional-shaped element carrier according to an embodiment of the present invention.
6A to 6D show an example of a frame structure of a cross sectional element carrier for TDD according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments. For reference, the same numbers in this description refer to substantially the same elements and can be described with reference to the contents of other drawings under these rules. The present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Also, each step of the inter-object communication method described below will be described with serial numbers, but the present invention is not limited to the sequence of serial numbers.

Fig. 1 shows a conceptually illustrated double-sided element carrier for FDD and a single-sided element carrier for TDD.

1, an FDD duplex carrier 100 in which a downlink 101 and an uplink 102 are divided in frequency for FDD (Frequency Division Duplexing) operation, and a TDD (Time Division Duplexing) There is shown a TDD cross sectional element carrier 200 in which the downlink and the uplink are temporally divided. Control information or data may be transmitted using the downlink 101 of the double-sided element carrier 100 for FDD, the uplink 102 and the single-sided element carrier 200 for TDD.

Fig. 2 shows a frame structure of a double-sided element carrier for FDD and a single-sided element carrier for TDD in a conceptually illustrated wireless communication system.

The (wireless) frame structure of an elementary carrier for data transmission in a 3GPP LTE system may include a frame 2100 and a sub-frame 2200 that constitutes a frame. Control information and data may be included in the frame 2100 and the subframe 2200 through the frequency spectrum assigned to the element carrier and transmitted over time. One frame may have a period of 10 milliseconds (ms), and one frame 2100 may include 10 subframes 2200 having a period of 1 ms.

Referring to FIG. 2, the double-sided element carrier for FDD 2300 may include a downlink two-sided element carrier 2310 for FDD and an uplink double-sided element carrier 2320 for FDD, which are divided in frequency.

The downlink frame of the FDD downlink two-sided element carrier 2310 may be composed of a downlink subframe (for example, a downlink subframe 2311) The link frame may be composed of an uplink subframe (e.g., uplink subframe 2321). Meanwhile, the downlink two-sided element carrier for FDD 2310 and the uplink two-sided element carrier for FDD 2320 are divided into frequencies, and the downlink / uplink subframe for the same time, for example, the downlink subframe 2311, And the uplink sub-frame 2321 can be simultaneously transmitted.

The downlink subframe and the uplink subframe of the TDD section element carrier 2400 may be temporally divided and transmitted at different times. For example, the downlink subframe 2401 and the uplink subframe 2402 may be transmitted at different times. A subframe of the cross sectional element carrier 2400 for TDD may include special subframes 2403 and 2404 together with downlink / uplink subframes 2401 and 2402. The special subframes 2403 and 2404 may include a guard time or a guard period between the DL subframe and the UL subframe. In addition, the number of downlink subframes, the number of uplink subframes, and the number of special subframes may be different from each other in one frame of the TDD section element carrier 2400 according to traffic characteristics.

3A and 3B show an environment in which a cross carrier aggregation method according to an embodiment of the present invention is performed.

Cross-carrier aggregation means that, when a terminal transmits and receives control information or data through a plurality of elementary carriers, the control information of one elementary carrier includes scheduling (e.g., link resource allocation) information for channels of different elementary carriers It can mean. At this time, the UE (or the base station) performs the scheduling for the channel of the other elementary carrier using the control information of the one elementary carrier, which is hereinafter referred to as cross carrier scheduling.

Referring to FIG. 3A, in a macro cell covered by a macro cell base station 330, the first terminal 310 and the second terminal 320 can communicate with the macro cell base station 330 using an element carrier. Although the first terminal 310 is communicating with the macro cell base station 330 using the double side element carrier for FDD, the second terminal 320 may communicate with the macro cell base station 330 using the FDD double side element carrier and the TDD single side element carrier. Lt; / RTI > Cross-carrier aggregation according to an embodiment of the present invention may be performed in an element carrier between the second terminal 320 and the macro-cell base station 330. [

Referring to FIG. 3B, the small cell covered by the small cell base station 340 may overlap with the macro cell. 3A, the second terminal 320 may communicate with the macro cell base station 330 using the FDD double-sided element carrier. In the second terminal 320, And can communicate with the small cell base station 340 using a TDD cross sectional element carrier. The cross carrier aggregation according to an embodiment of the present invention is performed by using the FDD double-sided element carrier between the second terminal 320 and the macro cell base station 330 and the FDD double element carrier between the second terminal 320 and the small cell base station 340, Sectional element carrier.

Prior to describing the cross carrier aggregation method according to an embodiment of the present invention, the carrier-by-carrier scheduling scheme and the cross-carrier scheduling scheme for cross carrier aggregation according to an embodiment of the present invention will be described.

A subframe of one elementary carrier includes a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), and a physical uplink shared channel (PDSCH). (Hereinafter referred to as " PUSCH "). At this time, in the carrier-specific scheduling scheme, control information including uplink / downlink resource allocation (UL-Grant / DL-Grant) information as a scheduling result is transmitted through the PDCCH, and the control information includes a PUSCH (UL- Grant) or PDSCH (in case of DL-Grant).

Meanwhile, the PDCCH may be included in a subframe of an elementary carrier different from the PDSCH or the PUSCH. In the cross-carrier scheduling scheme, control information including uplink / downlink resource allocation (UL-Grant / DL- , And the control information indicates a PDSCH (in case of UL-Grant) or a PDSCH (in case of DL-Grant) of different element carriers. In performing the cross carrier aggregation method according to the present invention, this cross carrier scheduling scheme is performed.

Meanwhile, in the cross-carrier scheduling scheme, the control information may be downlink control information (DCI), and the DCI may include a carrier indicator for specifying an elementary carrier containing the PDSCH to be indicated .

Figure 4 shows a frame of an element carrier on which cross carrier aggregation is performed in accordance with an embodiment of the present invention.

Referring to FIG. 4, as an element carrier on which cross carrier aggregation is performed according to an embodiment of the present invention, a downlink double side element carrier for FDD 4100, an uplink double side element carrier for FDD 4200, Carrier 4300 is an example.

The downlink subframe of the downlink duplex element carrier for FDD 4100 may include PDCCHs 4111, 4112, 4113 and 4114, which are channels through which control information is transmitted. Also, the PDCCH may include at least one piece of control information (e.g., a rectangular point in Fig. 4) such as PDCCHs 4111, 4113, and 4114, for example.

Meanwhile, although not shown, the downlink subframe of the FDD downlink duplex element carrier 4100 may include a PBCH (Physical Broadcast Channel) capable of transmitting master system information, for example, in addition to a PDCCH, A Physical Control Format Indicator Channel (PCFICH) for indicating the number of Orthogonal Frequency-Division Multiplexing (OFDM) symbols of a PDCCH for transmitting control information, a PDSCH A physical hybrid ARQ indicator channel (PHICH) capable of transmitting an ACK / NACK response for link data reception, a PMCH (Physical Multicast Channel) capable of transmitting multicast data, a primary synchronization (PSS) signal), an SSS (secondary synchronization signal), a CRS (Cell-speci fic reference signal.

The uplink subframe of the uplink two-sided element carrier for FDD 4200 may include control information or a channel through which data can be transmitted. For example, the uplink subframe of the FDD uplink two-sided element carrier 4200 includes a Physical Random Access Channel (PRACH) for uplink signal timing estimation and scheduling request, a Physical Random Access Channel (PRACH) for a downlink data block received via the PDSCH A Physical Uplink Control Channel (PUCCH) capable of transmitting an ACK / NACK response, a Scheduling Request (SR) or channel quality information, and an uplink data block or a Demodulation Reference Signal PUSCH and so on.

In the subframe of the TDD section element carrier 4300, the downlink subframe and the uplink subframe are temporally divided. 4, the downlink subframes 4311 to 4314 and 4315 and the uplink subframes 4321 and 4322 are exemplified. The downlink / uplink subframe of the TDD sectional element carrier 4300 may include each channel that may be included in the downlink / uplink subframe of the downlink / uplink duplex element carriers 4100 and 4200 for the FDDs listed above . However, the PSS and the SSS may be transmitted through a downlink sub-frame in a special sub-frame (e.g., special sub-frames 2403 and 2404 of FIG. 2).

The cross carrier aggregation method according to an embodiment of the present invention uses the above-described element carriers 4100 to 4300 and the above-described cross-scheduling, in which the first device is included in a subframe of the downlink element carrier The first device or the second device transmits, via the PDCCH, control information indicating a link resource allocation to a subframe of the one-dimensional element carrier to the second device, And then transmitting the data using the subframe.

Hereinafter, the first device will be referred to as a macro-cell base station 330 in FIG. 3A, the second device will be referred to as a second terminal 320, the double-sided element carrier will be a double-sided element carrier for FDD, The cross-carrier aggregation method according to an embodiment of the present invention described above with reference to FIG. 4 will be described.

First, the macro cell base station 330 allocates a link resource to a subframe of a TDD cross-sectional element carrier 4300 through a control channel (PDCCH) of a downlink subframe included in the FDD downlink two-sided element carrier 4100 The second terminal 320 may transmit control information indicating the first to fourth terminals 4121 to 4124.

For example, PDCCHs 4111 to 4114 are included as control channels in the downlink subframe of the downlink duplex element carrier 4100 for FDD. The control information is included in the PDCCHs 4111, 4113 and 4114, and in particular, the PDCCH 4111 includes two pieces of control information, which are transmitted from the macrocell base station 330 to the second terminal 320, Lt; / RTI >

One of the two pieces of control information transmitted via the PDCCH 4111 indicates uplink resource allocation (UL-Grant 4122) to the subframe 4321 of the TDD section element carrier 4300, and the other one (DL-Grant 4121) to the sub-frame 4311 of the TDD sectional-surface element carrier 4300. The control information transmitted via the PDCCH 4113 indicates uplink resource allocation (UL-Grant 4124) to the subframe 4322 of the TDD cross section element carrier 4300 and is transmitted via the PDCCH 4114 The transmitted control information indicates downlink resource allocation (DL-Grant 4123) to the sub-frame 4314 of the TDD sectional-component carrier 4300.

The macro cell base station 330 or the second terminal 320 can transmit data using subframes of the TDD section element carrier 4300 to which link resource allocation is directed by the control information.

At this time, the subframe of the TDD cross-sectional element carrier 4300 in which the control information indicates downlink resource allocation (DL-Grant) may include at least the PDSCH, and the data may be transmitted from the macro cell base station 330 through the PDSCH And may be transmitted to the second terminal 320.

In transmitting the data from the macro cell base station 330 to the second MS 320 as described above, the subframe of the TDD section element carrier 4300 including the PDSCH for transmitting the data transmits the control information And may be a subframe transmitted at the same time as the subframe of the downlink two-sided element carrier for FDD including the FDD. In the subframe of the TDD cross-sectional element carrier transmitted at the same time, only the first one OFDM symbol is allocated for the control information, but the control information is not actually transmitted to the OFDM symbol, and the PDSCH To transmit data.

For example, another control information (lower square point of the PDCCH 4111) transmitted through the PDCCH 4111 is allocated to DL resource allocation DL DL to the subframe 4311 of the TDD single-sided element carrier 4300 The data is transmitted from the macro cell base station 330 to the second MS 320 through the PDSCH of the downlink subframe 4311. [ Meanwhile, the subframe including the PDSCH to which the data is transmitted and the PDCCH 4111 to which the control information is transmitted has the same temporal timing. Although not shown, the PDSCH in which the data is transmitted, And may be allocated from the second OFDM symbol of the downlink subframe 4311.

Meanwhile, the subframe of the TDD cross-sectional element carrier 4300 in which the control information indicates uplink resource allocation (UL-Grant) may include at least a PUSCH, and the data may be transmitted to the second terminal 320 through the PUSCH, To the macro-cell base station 330.

In transmitting the data from the second MS 320 to the macro cell base station 330 as described above, the subframe of the TDD section element carrier 4300 including the PUSCH for transmitting the data transmits the control information (For example, four subframes) than the subframe of the downlink two-sided element carrier for FDD including the FDD.

4, the control information transmitted through the PDCCH 4113 includes uplink resource allocation (UL-Grant 4124) to the subframe 4322 of the TDD cross-sectional element carrier 4300, The data is transmitted from the second terminal 320 to the macro cell base station 330 through the PUSCH of the uplink subframe 4322. [ Meanwhile, the uplink subframe 4322 including the PUSCH to which data is transmitted is transmitted after four subframes after the subframe including the PDCCH 4113 to which the control information is transmitted.

According to the embodiment, the TDD sectional element carrier 4300 basically receives a downlink resource allocation (DL-Grant), and the control information of the FDD downlink two-dimensional element auxiliary carrier 4100 is allocated to an uplink resource allocation (UL-Grant). In this case, when control information is received, the uplink subframe including the PUSCH to which data is transmitted is automatically transmitted after four subframes after the subframe including the PDCCH to which the control information is transmitted.

Also, according to the embodiment, the timing of the PDSCH and the HARQ (Hybrid Automatic Repeat reQuest) included in the DL subframe of the TDD section element carrier 4300 can follow the HARQ timing of the FDD double-sided element carrier have. That is, the PDCCH for allocating link resource to the subframe of the TDD cross-sectional element carrier and the ACK / NACK transmission (the PUCCH in the downlink and the PHICH in the uplink) are transmitted through the duplex element carrier for FDD . The same HARQ timing as that of the duplex element carrier for the FDD can be provided and up to 8 HARQ processes can be supported.

Also, according to the embodiment, the TDD cross section element carrier 4300 can use a license frequency band which can be used exclusively through a predetermined procedure such as a frequency auction, but any communication carrier can not use exclusive license It may also be implemented using an unlicensed spectrum.

5A and 5B illustrate a guard interval included in a subframe of a TDD sectional-shaped element carrier according to an embodiment of the present invention.

For example, in FIG. 4, when switching from the downlink subframe 4314 to the uplink subframe 4321 of the TDD sectional-shaped element carrier according to time, signal propagation is performed according to the place where the second terminal 320 is located Since the delays are different, the uplink sub-frame 4321 must be transmitted in advance for synchronization between the terminals. At this time, if there is no guard interval between the DL subframe 4314 and the UL subframe 4321, interference may occur between the DL subframe 4314 and the UL subframe 4321.

Generally, in a LTE system, one subframe may include 14 OFDM symbols. Referring to FIG. 5A, for example, the link sub-frames 5110, 5120, 5210 and 5220 of the section element carrier 5000 for TDD include 14 OFDM symbols.

Referring to FIGS. 5A and 5B, the downlink subframe 5110 and the uplink subframe 5120 of the TDD section element carrier 5000 are adjacent to each other, and in the downlink subframe 5110, And can be switched to the uplink sub-frame 5120. Similarly, the downlink subframe 5210 and the uplink subframe 5220 are adjacent to each other and can be switched from the downlink subframe 5210 to the uplink subframe 5220 according to time.

The method for preventing inter-frame interference in a cross carrier aggregation method according to an embodiment of the present invention is a method for preventing inter-subframe interference in a cross carrier aggregation method according to an embodiment of the present invention, When the uplink subframes of the TDD cross-sectional element carriers indicated by the uplink resource allocation are adjacent by the second control information in the subframe and the FDD double-side element carriers are adjacent to the protection subframe in the downlink subframe or the uplink subframe, .

That is, as in the case of FIG. 5A, the first two OFDM symbols in the uplink sub-frame 5120 (two from the left) can be set as the guard interval 5130. Thus, interference can be avoided by not transmitting data or the like to the guard interval 5130, i.e., the two OFDM symbols.

The guard interval 5230 is not necessarily provided in the uplink subframe 5220 as shown in FIG. 5B but may be provided in the last two OFDM symbols of the downlink subframe 5210 . In addition, the number of OFDM symbols as the guard interval may not necessarily be two.

For example, in the TDD cross-sectional element carrier between the macro-cell base station 330 and the second terminal 320 of FIG. 3A, when the second terminal 320 is spatially close to the macro-cell base station 330, The number of OFDM symbols as a guard interval required for switching between the subframe and the uplink subframe may be smaller than two. This is because if the macrocell base station 330 and the second terminal 320 are close to each other, the propagation delay of the data signal is reduced. In the case of FIG. 3B, if the small cell base station 340 and the second terminal 320, which transmit data through the TDD cross-sectional element carrier, are close to each other, the number of OFDM symbols required for the guard interval may be smaller than two.

6A to 6D show an example of a frame structure of a cross sectional element carrier for TDD according to an embodiment of the present invention.

In the example of FIG. 4, the DL subframe and the UL subframe can be selectively included in the frame of the TDD sectional element carrier by the PDCCH. However, in the cross carrier aggregation method according to an embodiment of the present invention, the subframe of the TDD section element carrier may be composed only of the DL subframe in a cell environment having a large amount of downlink traffic. 6A to 6D show examples of the structure of the downlink subframe of the TDD sectional-surface element carrier.

The downlink subframe of the TDD single-sided element carrier according to FIG. 6A includes PSS and SSS for synchronization of terminals, CRS for channel estimation, PBCH capable of transmitting single-sided element carrier master system information for TDD, and double- And PDSCH in which link resource allocation is performed by control information. The downlink subframe of the TDD single-sided element carrier according to FIG. 6B may include PSS, SSS, CRS, PDSCH, and the downlink subframe of the TDD single-element carrier according to FIG. 6C includes PSS, SSS, PDSCH And the DL subframe of the cross-sectional element carrier for TDD according to FIG. 6D may include a PDSCH.

As described above, the physical channel included in the DL subframe of the TDD section element carrier may be a subset of the physical channels that can be included in the subframe of the FDD downlink duplex element carrier. In the downlink subframe included in the TDD cross-sectional element carrier, the number of OFDM symbols in the control channel region for PDCCH transmission is allocated to only one, and control information is transmitted through the PDCCH, control channels such as PHICH and PCFICH .

On the other hand, a subframe of the TDD elementary carrier includes a minimum physical channel (or a system parameter) in order to reduce the overhead due to the control channel, and transmits only the data and the minimum signal for data demodulation through the PDSCH (For example, in the case of FIG. 6D).

In the cross carrier aggregation method according to another embodiment of the present invention, the subframe of the TDD section element carrier may be composed of only uplink subframes in a cell environment having a large amount of uplink traffic. In this case also, the uplink subframe of the TDD section element carrier includes a PUSCH for data transmission without including a PUCCH, or a PUSCH and a PRACH without including a PUCCH in order to reduce an overhead due to a control channel. can do.

According to the cross carrier aggregation method according to various embodiments of the present invention, since the control information is transmitted through the double-sided element carrier for FDD and the data is transmitted through the double-sided element carrier for FDD and the single-sided element carrier for TDD, So that it is possible to increase the traffic transmission rate or the data transmission rate. In addition, the cross sectional element carrier for TDD may use the license-exempt band frequency, so that a cross carrier aggregation method according to various embodiments of the present invention may be implemented even when it is difficult to use the license band frequency.

Also, the control information for the cross-scheduling is transmitted through the duplex element carrier for FDD. In other words, since the control information for allocating the link resource of the TDD cross-sectional element carrier uses only the FDD DCI format, the base station and the terminal need not have a dual mode transceiver having both the FDD transmission / reception function and the TDD transmission / reception function. Thus, cross-carrier aggregation can be realized by utilizing the FDD transceiver already provided in the base station and the terminal.

In addition, if the downlink subframe and the uplink subframe of the TDD cross-sectional element carrier allocated with a link resource are adjacent to each other, the DL subframe or the UL subframe may include a guard interval, Frame and the uplink sub-frame can be prevented.

In addition, the subframe of the TDD cross-sectional element carrier may be constituted by downlink / uplink subframes only in a cell environment having a large amount of downlink / uplink traffic. At this time, since the physical channels other than the PDSCH / PUSCH can be transmitted to the downlink / uplink subframes at a minimum, the overhead due to the control channel can be reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be understood that various modifications and changes may be made in the present invention. Accordingly, it is to be understood that the scope of the present invention is defined by the claims appended hereto, and all of its equivalents or equivalents are included in the scope of the present invention.

100: Double-sided element carrier for FDD
200: Cross sectional element carrier for TDD
2100: Frame
2200: subframe
2310, 4100: Downlink two-sided element carrier for FDD
2320, 4200: Downlink two-sided element carrier for FDD
2400, 4300, 5000: Cross sectional element carrier for TDD
2311, 2401, 4311 to 4315, 5110, 5210:
2321, 2402, 4321, 4322, 5120, 5220:
2403, 2404: Special subframe
310:
320:
330: macro cell base station
340: Small cell base station
4111 to 4114: PDCCH
4121, 4123: allocation of downlink resources
4122, 4124: Uplink resource allocation
5010: OFDM symbol
5130, 5230: Protection zone

Claims (1)

A first device is connected to an unpaired component carrier via a Physical Downlink Control Channel (PDCCH) included in a subframe of a downlink elementary carrier of a paired component carrier. To the second device, control information for instructing allocation of a link resource to a subframe of the subframe,
Wherein the first apparatus or the second apparatus transmits data by using the sub-frame in which the link resource allocation is instructed by the control information.

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