WO2015053590A1

WO2015053590A1 - Method and apparatus for transmitting srs in celluar mobile communication system

Info

Publication number: WO2015053590A1
Application number: PCT/KR2014/009539
Authority: WO
Inventors: 김영범; 조준영; 지형주; 최승훈
Original assignee: 삼성전자 주식회사
Priority date: 2013-10-11
Filing date: 2014-10-10
Publication date: 2015-04-16

Abstract

The present invention relates to a method for transmitting, by a terminal, a sounding reference signal (SRS) or a physical uplink shared channel (PUSCH) in a mobile communication system. A communication method for a terminal in a communication system which supports the combination of configuration carrier using FDD scheme and configuration carrier using TDD scheme, in accordance with an embodiment of the present invention, comprises the steps of: receiving SRS transmission setting information from a base station; receiving uplink data scheduling information from the base station; determining whether or not the simultaneous transmission of the SRS transmission and the uplink data occurs; and setting the transmission of the uplink data or the SRS so that when the simultaneous transmission of the SRS transmission and the uplink data occurs, the sum of the respective transmission powers of the first and second symbols in an FDD cell and the first and second symbols of a TDD cell is not greater than the maximum transmission power of the terminal, wherein the timing of the first symbol in the FDD cell corresponds to the timing of the first symbol in the TDD cell, and the timing of the second symbol in the FDD cell corresponds to the timing of the second symbol in the TDD cell. In accordance with an embodiment of the present invention, defining the SRS transmission method of the terminal in a wireless communication system causes the terminal to effectively transmit the uplink data.

Description

Method and apparatus for SRS transmission in cellular mobile communication system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cellular wireless communication system. In particular, a carrier combination of a component carrier employing a frequency division duplex (FDD) scheme and a component carrier employing a time division duplex (TDD) scheme The present invention relates to a method for a terminal to transmit a sounding reference signal (SRS) to a base station in a communication system supporting the.

The wireless communications system away from who provide services in the early voice-oriented, for ^{example, 3GPP (3 rd Generation Partnership Project} ) in HSPA (High Speed Packet Access), LTE (Long Term Evolution), 3GPP2 (3 rd Generation Partnership Project 2) It is evolving into a broadband wireless communication system that provides high-speed, high-quality packet data services, such as communication standards such as High Rate Packet Data (HRPD), Ultra Mobile Broadband (UMB), and IEEE 802.16e.

In the LTE system, which is a representative example of a broadband wireless communication system, downlink adopts orthogonal frequency division multiplexing (OFDM), and uplink uses single carrier frequency division multiple access (SC-FDMA). It adopts Single Carrier Frequency Division Multiple Access. In the multiple access scheme as described above, data or control information for each user is divided by assigning and operating such that time-frequency resources for carrying data or control information for each user do not overlap each other, that is, orthogonality is established. do.

1 is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource region in which data or control information is transmitted in an uplink of an LTE system.

In the LTE system, uplink (UL) refers to a radio link through which a terminal transmits data or a control signal to a base station, and downlink (DL) refers to a radio link through which a base station transmits data or a control signal to a terminal. It means.

In FIG. 1, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. The minimum transmission unit in the time domain is an SC-FDMA symbol, and N _symb (102) SC-FDMA symbols are combined to form one slot 106. Then, two slots 106 are gathered to form one subframe 105, and ten subframes 105 are gathered to form one radio frame 107. The length of the slot is 0.5ms, the length of the subframe is 1.0ms and the length of the radio frame is 10ms. The minimum transmission unit in the frequency domain is a subcarrier.

The basic unit of resource in the time-frequency domain may be represented by an SC-FDMA symbol index and a subcarrier index as a resource element 112 (RE). Resource block 108 (or RB (Physical Resource Block)) includes N _symb (102) contiguous SC-FDMA symbols in the time domain and N ^RB _SC 110 contiguous subs in the frequency domain. Defined as carriers. Thus, one RB 108 is composed of N _symb x N ^RB _SC REs 112. In general, the minimum transmission unit of data is the RB 108, and the system transmission band is composed of a total of N _RB 108 RB (108). The total system transmission band consists of a total of N _RB x N ^RB _SC 104 subcarriers. In the LTE system, the N _symb = 7, N ^RB _SC = 12.

On the other hand, the LTE system employs a hybrid automatic repeat reQuest (HARQ) scheme in which the data is retransmitted in the physical layer when a decoding failure occurs in the initial transmission. In the HARQ scheme, when the receiver does not correctly decode the data, the receiver transmits information (NACK) indicating the decoding failure to the transmitter, thereby enabling the transmitter to retransmit the corresponding data in the physical layer. The receiver combines the data retransmitted by the transmitter with the data that has previously failed to be decoded to increase data reception performance. In addition, when the receiver correctly decodes the data, the transmitter may transmit information (ACK) indicating the successful decoding so that the transmitter may transmit new data.

One of the important things for providing high speed wireless data service in broadband wireless communication system is support of scalable bandwidth. For example, the system transmission band of the LTE system may have various bandwidths such as 20/15/10/5/3 / 1.4 MHz. Accordingly, service providers can select a specific bandwidth from various bandwidths and provide a service. In addition, there may be various types of terminals, such as those capable of supporting a maximum bandwidth of 20 MHz to only a minimum of 1.4 MHz bandwidth.

2 is a diagram illustrating an example of a system configuration of an LTE-A system supporting carrier combining.

2 shows an example in which the base station 202 supports a combination of two component carriers CC # 1 and CC # 2, CC # 1 is configured with a frequency f1, and CC # 2 is configured with a frequency f2 different from f1. Indicates. CC # 1 and CC # 2 are provided in the same base station 202. The base station 202 then provides

coverages

204 and 206 corresponding to each component carrier. In the LTE-A system supporting carrier combining, basically, data transmission and control information transmission for supporting data transmission are performed for each component carrier. The configuration of FIG. 2 is equally applicable to uplink carrier coupling as well as downlink carrier coupling.

In the carrier combining system, each component carrier is classified into a Pcell or an Scell. Pcell (Primary Cell) (or first cell) refers to a cell that provides a basic radio resource to the terminal, the base station is a reference for the terminal performs operations such as initial access and handover. Pcell consists of a downlink primary frequency (or primary component carrier (PCC)) and an uplink primary frequency. The Scell (Secondary Cell) (or second cell) is a cell that provides additional radio resources to the UE together with the Pcell, and is configured with a downlink secondary frequency (or SCC: Secondary Component Carrier) and an uplink secondary frequency. In the present invention, unless stated otherwise, a cell and a component carrier are used interchangeably.

Frequency division duplex (FDD) uses separate frequencies for downlink and uplink. On the other hand, TDD (Time Division Duplex) uses a common frequency for downlink and uplink, and operates the transmission and reception of the uplink signal and the downlink signal in the time domain. In LTE TDD, uplink or downlink signals are classified and transmitted according to subframes. Therefore, according to the traffic load of uplink and downlink, the uplink / downlink subframes are divided evenly in the time domain, or more subframes are allocated to the downlink or uplink More subframes can be allocated and operated.

Table 1

Uplink-downlink configuration	Subframe number
Uplink-downlink configuration	0	One	2	3	4	5	6	7	8	9
0	D	S	U	U	U	D	S	U	U	U
One	D	S	U	U	D	D	S	U	U	D
2	D	S	U	D	D	D	S	U	D	D
3	D	S	U	U	U	D	D	D	D	D
4	D	S	U	U	D	D	D	D	D	D
5	D	S	U	D	D	D	D	D	D	D
6	D	S	U	U	U	D	S	U	U	D

[Table 1] shows a TDD uplink-downlink configuration defined in LTE. In Table 1, 'D' represents a subframe configured for downlink transmission, and 'U' represents a subframe configured for uplink transmission. 'S' represents a special subframe including Dwonlink Pilot Time Slot (DwPTS), Guard Period (GP), and Uplink Pilot Time Slot (UpPTS).

3 is a diagram illustrating a structure of a special subframe of an LTE TDD system.

Referring to FIG. 3, the DwPTS 301 may transmit control information in downlink like a general subframe, and may also transmit downlink data if the length of the DwPTS 301 is sufficiently long according to the setting state of the special subframe. Do. GP 302 is a period for accepting the transition of the transmission signal from the downlink to the uplink is determined in accordance with the network configuration. The UpPTS 303 is composed of one or two SC-FDMA symbols, which are used for transmitting a SRS (Sounding Reference Signal) of a terminal for estimating an uplink channel state or a random access preamble transmission of a terminal for random access. .

The length of the special subframe is 1ms like the normal subframe. The DwPTS 301 is configured with 3 to 12 OFDM symbols, and the UpPTS 303 is configured with 1 to 2 SC-FDMA symbols according to the base station configuration. The GP 302 corresponds to the remaining time length after subtracting the lengths of the DwPTS 301 and the UpPTS 303 from the total length of 1 ms of the special subframe.

As shown in [Table 1], the special subframe may be set in the position of subframe # 1 or subframe # 6 according to TDD uplink-downlink configuration.

For example, in case of TDD uplink-downlink configuration # 6, downlink data and control information can be transmitted in subframes # 0, # 5, and # 9, and subframes # 2, # 3, # 4, and # 7. In uplink # 8, uplink data and control information can be transmitted. In subframes # 1 and # 6 corresponding to the special subframe, downlink control information and downlink data may be transmitted in some cases, and a SRS (Sounding Reference Signal) or RACH may be transmitted in the uplink.

The base station estimates an uplink channel state from the SRS transmitted by the UE. In general, the SRS may be transmitted to the last SC-FDMA symbol position in a subframe. In the LTE system to which the TDD scheme is applied, SRS transmission is possible over up to two SC-FDMA symbols in the UpPTS section of the special subframe. In which subframe, SRS can be transmitted and which SC-FDMA symbol can be transmitted in an UpPTS period, the base station configures and informs the user equipment through signaling.

The existing LTE-A system supporting carrier combining has a constraint that the same duplex scheme should be applied to each component carrier. That is, the component carriers applying the FDD scheme perform carrier combining or the component carriers applying the TDD scheme perform carrier combining.

The present invention proposes a method for transmitting an SRS by a UE in a special subframe when performing carrier combining by applying different duplex schemes for each component carrier.

The present invention provides a method for a terminal to transmit a Sounding Reference Signal (SRS) to a base station in a communication system supporting carrier combining of a component carrier using the FDD scheme and a component carrier using the TDD scheme.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

A communication method of a terminal in a communication system supporting a combination of a component carrier applying an FDD scheme and a component carrier applying a TDD scheme according to an embodiment of the present invention for achieving the above object includes: Receiving; Receiving uplink data scheduling information from the base station; Determining whether simultaneous transmission of the SRS and the uplink data occurs; And when simultaneous transmission of the SRS transmission and the uplink data occurs, the sum of the transmission powers of the first symbol, the second symbol of the FDD cell, and the first symbol and the second symbol of the TDD cell is the maximum transmission of the terminal. Setting up transmission of the uplink data or the SRS such that the power is not exceeded. In this case, the timing of the first symbol of the FDD cell corresponds to the timing of the first symbol of the TDD cell, and the timing of the second symbol of the FDD cell corresponds to the timing of the second symbol of the TDD cell.

In addition, a communication method of a base station in a communication system supporting a combination of a component carrier applying the FDD scheme and a component carrier applying the TDD scheme according to an embodiment of the present invention, SRS transmission setting to the terminal Transmitting information; Transmitting uplink data scheduling information to the terminal; It may include. In this case, the SRS transmission configuration information and the uplink data scheduling information may include the first symbol, the second symbol, and the first symbol of the FDD cell, and the first symbol, when the simultaneous transmission of the SRS transmission and the uplink data occurs. And setting information for setting transmission of the uplink data or the SRS such that the sum of the transmission powers for each of the two symbols does not exceed the maximum transmission power of the terminal, wherein the timing of the first symbol of the FDD cell is the TDD. And the timing of the second symbol of the FDD cell corresponds to the timing of the second symbol of the TDD cell.

In addition, a terminal of a communication system supporting a combination of a component carrier applying the FDD scheme and a component carrier applying the TDD scheme according to an embodiment of the present invention for achieving the above object includes a communication unit for communicating with a base station; And receiving SRS transmission configuration information from the base station, receiving uplink data scheduling information from the base station, determining whether simultaneous transmission of the SRS transmission and the uplink data occurs, and determining the SRS transmission and the uplink. When simultaneous transmission of data occurs, the uplink of the first symbol, the second symbol of the FDD cell and the first symbol of the TDD cell, and the second symbol of the second symbol do not exceed the maximum transmission power of the terminal. And a control unit configured to control transmission of the link data or the SRS. In this case, the timing of the first symbol of the FDD cell corresponds to the timing of the first symbol of the TDD cell, and the timing of the second symbol of the FDD cell corresponds to the timing of the second symbol of the TDD cell.

In addition, a base station of a communication system supporting a combination of a component carrier applying the FDD scheme and a component carrier applying the TDD scheme according to an embodiment of the present invention for achieving the above object, the communication unit for communicating with the terminal; And a control unit which transmits SRS transmission configuration information to the terminal and controls to transmit uplink data scheduling information to the terminal. In this case, the SRS transmission configuration information and the uplink data scheduling information may include the first symbol, the second symbol, and the first symbol of the FDD cell, and the first symbol, when the simultaneous transmission of the SRS transmission and the uplink data occurs. And setting information for setting transmission of the uplink data or the SRS such that the sum of the transmission powers for each of the two symbols does not exceed the maximum transmission power of the terminal, wherein the timing of the first symbol of the FDD cell is the TDD. And the timing of the second symbol of the FDD cell corresponds to the timing of the second symbol of the TDD cell.

The present invention defines the SRS transmission method of the terminal in the wireless communication system, the terminal can efficiently transmit the uplink data.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

1 is a diagram illustrating a basic structure of an uplink time-frequency domain of an LTE system.

4 is a diagram illustrating an example in which a special subframe of a TDD cell and a subframe of an FDD cell overlap each other in time.

5 is a diagram showing Method 1 according to a first embodiment of the present invention.

6 is a diagram showing Method 2 according to a first embodiment of the present invention.

7 is a diagram showing Method 3 according to a first embodiment of the present invention.

8 is a diagram showing Method 4 according to a first embodiment of the present invention.

9 is a diagram showing Method 1 according to a second embodiment of the present invention.

10 is a diagram showing Method 2 according to a second embodiment of the present invention.

11 is a diagram showing Method 3 according to a second embodiment of the present invention.

12 is a diagram showing Method 1 according to a third embodiment of the present invention.

13 is a diagram showing Method 2 according to a third embodiment of the present invention.

14 is a diagram showing Method 3 according to a third embodiment of the present invention.

15 is a diagram showing Method 4 according to a third embodiment of the present invention.

16 is a diagram showing Method 1 according to a fourth embodiment of the present invention.

17 is a diagram showing Method 2 according to a fourth embodiment of the present invention.

18 is a diagram showing Method 3 according to a fourth embodiment of the present invention.

19 is a diagram showing the method of the fifth embodiment of the present invention.

20 is a diagram illustrating a procedure of a base station according to one embodiment of the present invention.

21 is a diagram illustrating a procedure of a terminal according to one embodiment of the present invention.

22 is a diagram illustrating an apparatus for transmitting a terminal according to an embodiment of the present invention.

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

24 is a view showing a method of the sixth embodiment of the present invention.

25 is a diagram illustrating a procedure of a base station according to the sixth embodiment of the present invention.

26 is a diagram illustrating a procedure of a terminal according to a sixth embodiment of the present invention.

27 is a diagram illustrating an apparatus for transmitting a terminal according to another embodiment of the present invention.

28 is a diagram illustrating a receiving apparatus of a base station according to another embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, embodiments of the present invention will be described in detail with the accompanying drawings. In addition, in describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. 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.

Hereinafter, the base station is a subject performing resource allocation of the terminal, and may be at least one of an eNode B, an eNB, a Node B, a base station (BS), a radio access unit, a base station controller, or a node on a network.

The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function.

In addition, the present invention describes a specific embodiment using an E-UTRA (or LTE) or Advanced E-UTRA (or LTE-A) system as an example, but other communications having a similar technical background and / or channel form. Embodiments of the invention may also be applied to a system.

In addition, the embodiment of the present invention may be applied to other communication systems through some modifications within the scope of the present invention without departing from the scope of the present invention by the judgment of those skilled in the art.

The present invention defines a method of transmitting a sounding reference signal (SRS) by the UE in a special subframe when performing carrier combining by applying different duplex schemes for each component carrier.

Hereinafter, with reference to the drawings will be described in detail the problem to be solved by the present invention.

4 illustrates an example in which a special subframe of a TDD cell and a subframe of an FDD cell overlap each other in time.

Referring to FIG. 4, in a carrier combining system operating by combining a cell (or component carrier) applying the FDD scheme and a cell (or component carrier) applying the TDD scheme, a special subframe of the TDD cell 402 A case in which 408 and the subframes 403 of the FDD cell 401 overlap with each other in time is illustrated. In the case of the TDD cell 402, the UpPTS 407 of the special subframe 408 is set by two SC-FDMA symbol lengths. During the subframe 403 of the FDD cell 401, the UE is scheduled to transmit uplink data from the base station and transmits a PUSCH (Physical Uplink Shared Channel), and the special subframe 408 of the TDD cell 402. Assume a case in which an SRS is transmitted during an UpPTS 407 period.

The PUSCH is a physical channel that carries uplink data transmitted from the terminal to the base station. Reference signals (RSs) 409 and 410 are transmitted for channel estimation purposes for the PUSCH. Accordingly, the PUSCH is mapped to the remaining

sections

411, 412, and 413 except for the symbol where the

RSs

409 and 410 are located in a subframe, and transmitted to the base station.

The base station determines whether to transmit one or two SRS symbols during the UpPTS 407 period, and which symbol position of the UpPTS 407 is to be transmitted when one SRS is transmitted. Inform the user through higher layer signaling.

In this case, since the UE should transmit the PUSCH to the FDD cell 401 and simultaneously transmit the SRS to the TDD cell 402 during the period corresponding to the UpPTS 407, the sum of the PUSCH transmission power and the SRS transmission power is equal to that of the UE. Problems that exceed the maximum allowable transmit power may occur. Therefore, it is necessary to define a specific transmission method of the PUSCH and SRS.

In the first embodiment, under the conditions as shown in FIG. 4, the UE defines a specific operation for a case in which the UE intends to transmit the SRS to the TDD cell while simultaneously transmitting the PUSCH to the FDD cell. A first embodiment describes a method for a case where a UE wants to transmit 2 symbols of an SRS during an UpPTS period to a TDD cell.

1) Method 1

Method 1 transmits only the second SRS symbol without transmitting the first SRS symbol among two SRS symbols that the UE intends to transmit to the TDD cell 502, and the PUSCH to be transmitted to the FDD cell 501 is the last in the subframe. Rate matching is performed on the symbol interval to transmit the PUSCH. In general, channel coding is performed to add an error correction capability to data to be transmitted by the terminal. The actual terminal adjusts the size of the channel-coded output bit string according to the amount of resources scheduled from the base station to map the time-frequency resource. The operation is called rate matching.

Referring to Fig. 5, Method 1 is described below. The UE does not transmit the first SRS symbol 508 in the UpPTS period 507 corresponding to two SC-FDMA symbol time lengths in the special subframe 504 of the TDD cell 502, and the second SRS symbol ( 509). In the case of the FDD cell 501, the PUSCH is not transmitted in the last SC-FDMA symbol period 510 when the transmission time point overlaps with the second SRS symbol 509 of the UpPTS period 507. Then, rate matching the channel coded uplink data for the remaining time interval except for the last SC-FDMA symbol position 510 and the RS symbol positions 512 and 513 in the corresponding subframe 503 of the FDD cell 501. The PUSCH may be configured and transmitted (511). Therefore, in view of uplink signal transmission of the UE, the FDD cell 501 and the TDD cell at any time during the subframe 503 of the FDD cell 501 or the special subframe 504 of the TDD cell 502. By avoiding the occurrence of uplink signal transmission at the same time to 502, it is possible to solve the problem that the sum of the PUSCH transmission power and the SRS transmission power exceeds the maximum allowable transmission power of the terminal. In case of Method 1, the PUSCH and the SRS are not transmitted one symbol for each PUSCH and the SRS, so that both the PUSCH and the SRS do not cause excessive transmission loss.

2) method 2

Referring to Fig. 6, Method 2 is described below. Method 2 uses a first SRS symbol 608 and a second SRS symbol 609 during an UpPTS period 607 corresponding to two SC-FDMA symbol time lengths in a special subframe 604 of the TDD cell 602. Send everything. In the case of the FDD cell 601, the last two SC-

FDMA symbol intervals

610 and 611 overlapping the transmission time and the transmission time of the first SRS symbol 608 and the second SRS symbol 609 of the UpPTS interval 607. ) Does not transmit the PUSCH. In the corresponding subframe 603 of the FDD cell 601, the channel-coded uplink for the remaining time interval except for the last two SC-

FDMA symbol intervals

610 and 611 and the RS symbol positions 613 and 614. In operation 612, the PUSCH may be configured by rate matching the data. In the case of PUSCH, unlike SRS, if an error occurs in a PUSCH transmitted in a current subframe, there is a possibility that the error can be recovered by retransmission through HARQ. Using this feature, Method 2 has a feature that prioritizes SRS transmission if possible.

3) Method 3

Referring to Fig. 7, Method 3 is described below. Method 3 uses a first SRS symbol 708 and a second SRS symbol 709 during an UpPTS period 707 corresponding to two SC-FDMA symbol time lengths in a special subframe 704 of the TDD cell 702. Do not send all. In the case of the FDD cell 701, the PUSCH is configured and transmitted by rate-matching channel-coded uplink data over the SC-FDMA symbol except for the RS symbol positions 711 and 712 in the subframe 703 (710). Method 3 is characterized by giving priority to PUSCH transmission over SRS transmission.

4) Method 4

Referring to Fig. 8, Method 4 is as follows. Method 4 uses a first SRS symbol 808 and a second SRS symbol 809 during an UpPTS period 807 corresponding to two SC-FDMA symbol time lengths in a special subframe 804 of the TDD cell 802. Send everything. In case of the FDD cell 801, the PUSCH is configured and transmitted by rate matching uplink channel-coded uplink data over the SC-FDMA symbol except for the RS symbol positions 811 and 812 in the subframe 803 (810). .

However, during the UpPTS period 807 where uplink signal transmission to the FDD cell 801 and the TDD cell 802 occurs simultaneously, the total of the PUSCH transmission power and the SRS transmission power is maintained within the maximum allowable transmission power of the UE. Adjust the transmit power or SRS transmit power. For example, if the priority is given to PUSCH transmission, the SRS transmission power is adjusted to a value lower than the required transmission power, so that the sum of the PUSCH transmission power and the SRS transmission power during the UpPTS period 807 is the maximum allowable transmission of the UE. Keep it within power. Alternatively, if priority is given to SRS transmission, the PUSCH transmission power is adjusted to a value lower than the required transmission power so that the sum of the PUSCH transmission power and the SRS transmission power is maintained within the maximum allowable transmission power of the UE during the UpPTS period 807. Do it. Alternatively, the SRS transmission power and the PUSCH transmission power may be adjusted to lower values than necessary transmission power, respectively, so that the sum of the PUSCH transmission power and the SRS transmission power during the UpPTS period 807 may be maintained within the maximum allowable transmission power of the terminal.

In general, the PUSCH transmission power is kept constant within a subframe as long as the PUSCH is transmitted to facilitate receiver operation. Therefore, when the PUSCH transmission power is adjusted and transmitted during the SC-FDMA symbol period overlapping with the UpPTS period 807 according to an embodiment, the adjusted PUSCH transmission power value is the SC-FDMA overlapping with the UpPTS period 807. The same may be applied to the symbol interval as well as the remaining symbol intervals in which the PUSCH is transmitted in the subframe.

Whether to give priority to SRS signal transmission or priority to PUSCH signal transmission or equalize SRS signal transmission and PUSCH signal transmission without priority when adjusting transmission power of the UE through higher layer signaling. The terminal may be notified by notification.

The method 1 to method 4 may be defined in advance, or the base station may notify the terminal by notifying the user equipment through higher layer signaling. Alternatively, depending on whether the PUSCH is initial transmission or retransmission, one of the methods 1 to 4 may be defined. For example, if the PUSCH is the initial transmission, the method 3 of prioritizing the PUSCH transmission may be applied. If the PUSCH is the retransmission, the method 2 of the priority of the SRS transmission may be applied. If the PUSCH is retransmission, since the probability of success of decoding the PUSCH can be increased through HARQ processing in which the base station receiver combines the initial transmission PUSCH and the retransmission PUSCH, the SRS transmission can be given priority in the retransmission of the PUSCH. .

Second Embodiment

A second embodiment defines a specific operation for a case where a UE intends to transmit a SRS to a TDD cell while simultaneously transmitting a PUSCH to an FDD cell under the conditions as shown in FIG. 4. The second embodiment describes a method for a case where a UE wants to transmit two symbols of an SRS to an TDD cell during an UpPTS period and to transmit a PUSCH and an SRS to an FDD cell.

1) Method 1

Referring to Fig. 9, Method 1 is described below. Method 1 transmits only the second SRS symbol 909 without transmitting the first SRS symbol 908 out of two SRS symbols that the UE intends to transmit to the TDD cell 902. In operation 910, the SRS to be transmitted to the FDD cell 901 is mapped to the last symbol in the subframe 903. In addition, the data to be transmitted to the FDD cell 901 is PUSCH by rate matching for the remaining intervals except for the last symbol position 910 and the RS symbol positions 912 and 913 where the SRS is transmitted in the subframe 903. Configure and transmit (911).

In this case, the terminal is such that the sum of the transmission power of the SRS 910 transmitted to the FDD cell 901 and the transmission power of the SRS 909 transmitted to the TDD cell 902 does not exceed the maximum allowable transmission power of the terminal, respectively. The size of the SRS transmit power can be adjusted. The size of the adjusted SRS transmission power may be determined according to priority. For example, when the

SRSs

910 and 909 transmitted to the FDD cell 901 and the TDD cell 902 are equally important, the transmission power of the SRS 910 transmitted to the FDD cell 901 and the TDD cell ( The transmission power of the SRS 909 transmitted to 902 may be reduced at an equal rate so that the sum of the power controlled SRS transmission powers does not exceed the maximum allowable transmission power of the terminal. If the priority is given to the SRS 910 transmitted to the FDD cell 901, the transmission power of the SRS 909 transmitted to the TDD cell 902 is relatively reduced and transmitted to the FDD cell 901. By reducing or not reducing the transmission power of the SRS 910 relatively little, the sum of the power controlled SRS transmission power may not exceed the maximum allowable transmission power of the terminal. According to an embodiment, the priority may be set by the base station and inform the terminal through higher layer signaling.

2) Method 2

Referring to Fig. 10, Method 2 is described below. Method 2 performs a first SRS symbol 1008 and a second SRS symbol 1009 during an UpPTS period 1007 corresponding to two SC-FDMA symbol time lengths in a special subframe 1004 of the TDD cell 1002. Send everything.

The SRS to be transmitted to the FDD cell 1001 is mapped to the last symbol 1010 in the subframe 1003 and transmitted. As in the method 1, the terminal may transmit the sum of the transmission power of the SRS 1010 transmitted to the FDD cell 1001 and the transmission power of the SRS 1009 transmitted to the TDD cell so as not to exceed the maximum allowable transmission power of the terminal. The size of the SRS transmit power may be adjusted according to priority.

In this case, the uplink data to be transmitted to the FDD cell 1001 is channel-coded uplink in the subframe 1003 over the interval overlapping the UpPTS interval 1007 and the interval except for the

RS symbol positions

1013 and 1014. The PUSCH is configured by rate matching the link data (1012). Accordingly, uplink signaling is not performed on the last second symbol 1011 of the subframe 1003.

Method 2 is a TDD cell 1002 by allowing a two-symbol SRS transmission if possible in the TDD cell 1002 while taking the PUSCH transmission loss that may occur by reducing the number of symbols constituting the PUSCH transmitted in the FDD cell 1001 ), The base station relatively accurately measures the channel condition.

3) Method 3

Referring to Fig. 11, Method 3 is described below. Method 3 uses a first SRS symbol 1108 and a second SRS symbol 1109 during an UpPTS period 1107 corresponding to two SC-FDMA symbol time lengths in a special subframe 1104 of the TDD cell 1102. Send everything. In the case of the FDD cell 1101, the SRS is mapped and transmitted to the last symbol 1110 in the subframe 1103. The subframe 1103 configures and transmits a PUSCH by rate matching channel coded uplink data for the remaining periods except for the symbol 1110 to which the SRS is mapped and the RS symbol positions 1112 and 1113 (1111). ).

However, during the UpPTS period 1107 in which uplink signal transmission to the FDD cell 1101 and the TDD cell 1102 occurs simultaneously, the transmission power of the uplink signal transmitted to the FDD cell 1101 and the TDD cell 1102 are transmitted. The transmission power of each uplink signal is adjusted to maintain the sum of the transmission powers of the uplink signals transmitted to the mobile station within the maximum allowable transmission power of the terminal. In this case, as in Method 1, the transmission power may be adjusted by defining priorities for each cell or for each signal type transmitted through uplink.

In general, the PUSCH transmission power is kept constant within a subframe as long as the PUSCH is transmitted to facilitate receiver operation. Accordingly, when the PUSCH transmission power is adjusted and transmitted during the SC-FDMA symbol period overlapping the UpPTS period 1107, the adjusted PUSCH transmission power value is SC-FDMA overlapping the UpPTS period 1107. The same may be applied to the symbol interval as well as the remaining symbol intervals in which the PUSCH is transmitted in the subframe.

Similar to the first embodiment, which method of the method 1 to method 3 of the second embodiment is to be defined in advance or the base station may notify the terminal by notifying the terminal through higher layer signaling. Alternatively, depending on whether the PUSCH is initial transmission or retransmission, one of the methods 1 to 3 may be defined. For example, if the PUSCH is the initial transmission, the method 1 that prioritizes the PUSCH transmission may be applied. If the PUSCH is the retransmission, the method 2 that prioritizes the SRS transmission may be applied. If the PUSCH is retransmission, the probability of success of decoding of the PUSCH can be increased through HARQ processing in which the base station receiver combines the initial transmission PUSCH and the retransmission PUSCH, so that the SRS transmission can be prioritized when the PUSCH is retransmitted. .

According to an embodiment, the modified embodiment of the first to second embodiments may define an operation when the UE transmits a PUSCH to the FDD cell and transmits a random access preamble during the UpPTS 2 symbol period to the TDD cell. . In general, since the PUSCH can additionally correct errors by applying the HARQ operation, when the PUSCH and the random access preamble transmission time overlap as described above, priority may be given to the random access preamble transmission. In addition, since the length of the random access preamble in the UpPTS interval is fixed to 2 symbol intervals, Method 2 and Method 2 according to the first to second embodiments are methods for transmitting two-symbol uplink signals in UpPTS. 4 and Method 2 and Method 3 of the second embodiment can be applied. In this case, however, the SRS is replaced with a random access preamble in the method descriptions of the first to second embodiments. In order to prevent degradation of reception performance of the random access preamble, the transmission power of the random access preamble may be maintained at a constant value during the UpPTS period.

Third Embodiment

The third embodiment defines a specific operation for a case where the UE intends to transmit the SRS to the TDD cell while simultaneously transmitting the PUSCH to the FDD cell under the conditions as shown in FIG. 4. The third embodiment describes a method for a case where a UE wants to transmit an SRS at a first symbol position during an UpPTS period to a TDD cell.

1) Method 1

In Method 1, the UE does not transmit the SRS symbol to be transmitted to the TDD cell 1202 and the PUSCH to be transmitted to the FDD cell 1201 is transmitted using all symbols in the subframe. Referring to Fig. 12, Method 1 is described below. The UE does not transmit the SRS symbol 1208 to be transmitted in the special subframe 1204 of the TDD cell 1202. In the case of the FDD cell 1201, the channel-coded uplink data is rated over the remaining symbol intervals except the

RS symbol positions

1210 and 1211 among the entire symbols in the subframe 1203 including the interval overlapping the UpPTS interval 1207. The PUSCH is configured to be matched and transmitted (1209). Therefore, in view of uplink signal transmission of the UE, uplink signal transmission occurs simultaneously to the FDD cell 1201 and the TDD cell 1202 at any time during the subframe 1203 or the special subframe 1204. By avoiding the case, the problem that the sum of the PUSCH transmission power and the SRS transmission power exceeds the maximum allowable transmission power of the terminal. In case of Method 1, priority is given to PUSCH transmission by not performing SRS transmission of TDD cell 1202.

2) Method 2

Referring to Fig. 13, Method 2 is described below. Method 2 transmits the SRS symbol 1308 at the first symbol position of the UpPTS interval 1307 corresponding to two SC-FDMA symbol time lengths in the special subframe 1304 of the TDD cell 1302. In the FDD cell 1301, the PUSCH is not transmitted in the SC-FDMA symbol interval 1310 where the transmission time point overlaps with the SRS symbol 1308 of the UpPTS period 1307. In addition, in the corresponding subframe 1303 of the FDD cell 1301, the remaining time interval except for the SC-FDMA symbol interval 1310 and the

RS symbol positions

1312 and 1313 overlapping the transmission time point with the SRS symbol 1308 ( The PUSCH is configured by using rate-matching channel coded uplink data during 1309 and 1311 and transmitted.

3) Method 3

Referring to Fig. 14, Method 3 is described below. Method 3 transmits an SRS symbol 1408 at the first symbol position of UpPTS 1407 corresponding to two SC-FDMA symbol time lengths in special subframe 1404 of TDD cell 1402. For the FDD cell 1401, the rest of the interval except for the last two SC-

FDMA symbols

1410 and 1411 and the

RS symbol positions

1412 and 1413 in the subframe 1403 overlapping the transmission time point with the UpPTS 1407 are included. The channel-coded uplink data is rate matched to configure and transmit a PUSCH (1409). Method 3 is characterized by giving priority to SRS transmission over PUSCH transmission.

4) Method 4

Referring to Fig. 15, Method 4 is as follows. Method 4 transmits an SRS symbol 1508 at the first symbol position of UpPTS 1507 corresponding to two SC-FDMA symbol time lengths in special subframe 1504 of TDD cell 1502. The FDD cell 1501 configures and transmits a PUSCH by rate matching channel coded uplink data over the remaining symbols except for the

RS symbol positions

1511 and 1512 in the subframe 1503 (1510).

However, the maximum allowance of the PUSCH transmission power and the SRS transmission power at the position of the SRS symbol 1508 of the UpPTS interval 1507 where uplink signal transmission to the FDD cell 1501 and the TDD cell 1502 occurs simultaneously is allowed. Adjust the PUSCH transmit power or SRS transmit power to stay within the transmit power. For example, if the priority is given to PUSCH transmission, the SRS transmission power is adjusted to a value lower than the required transmission power so that the sum of the PUSCH transmission power and the SRS transmission power at the position of the SRS symbol 1508 allows the terminal to allow maximum. Keep within transmit power. Alternatively, if priority is given to SRS transmission, the PUSCH transmission power is adjusted to a value lower than the required transmission power so that the sum of the PUSCH transmission power and the SRS transmission power at the position of the SRS symbol 1508 is within the maximum allowable transmission power of the UE. Keep it. Alternatively, the SRS transmission power and the PUSCH transmission power may be adjusted to lower values than the necessary transmission power, respectively, so that the sum of the PUSCH transmission power and the SRS transmission power at the position of the SRS symbol 1508 may be maintained within the maximum allowable transmission power of the UE. .

In general, the PUSCH transmission power is kept constant within a subframe as long as the PUSCH is transmitted to facilitate receiver operation. Therefore, when the PUSCH transmission power is adjusted and transmitted at the position of the SRS symbol 1508 according to an embodiment, the adjusted PUSCH transmission power value is determined by the position at which the SRS symbol 1508 is transmitted in the UpPTS period 1507. The same applies to not only the overlapping SC-FDMA symbol period but also the remaining symbol period in which the PUSCH is transmitted in the subframe.

The method 1 to method 4 may be defined in advance, or the base station may notify the terminal by notifying the user equipment through higher layer signaling. Alternatively, depending on whether the PUSCH is initial transmission or retransmission, one of the methods 1 to 4 may be defined. For example, if the PUSCH is the initial transmission, the method 1 that prioritizes the PUSCH transmission may be applied. If the PUSCH is the retransmission, the method 2 or method 3 may be applied. If the PUSCH is retransmission, the probability of success of decoding the PUSCH can be increased through HARQ processing in which the base station receiver combines the initial transmission PUSCH and the retransmission PUSCH, so that the SRS transmission can be prioritized when the PUSCH is retransmitted. .

Fourth Embodiment

The fourth embodiment defines a specific operation for the case where the UE intends to transmit the SRS to the TDD cell while simultaneously transmitting the PUSCH to the FDD cell under the conditions as shown in FIG. 4. A fourth embodiment describes a method for a case where a UE wants to transmit an SRS at a first symbol position during an UpPTS period to a TDD cell and to transmit a PUSCH and an SRS to an FDD cell.

1) Method 1

Referring to Fig. 16, Method 1 is described below. In Method 1, the UE does not transmit the SRS symbol to be transmitted to the TDD cell 1602, and the SRS to be transmitted to the FDD cell 1601 is mapped to the last symbol in the subframe 1603 and transmitted (1610). The data to be transmitted to the FDD cell 1601 is rate-matched with respect to the remaining interval except for the last symbol interval 1610 and the

RS symbol positions

1612 and 1613 in which the SRS is transmitted in the subframe 1603 to configure the PUSCH. And transmit (1611). Therefore, the method 1 is characterized by giving priority to uplink signal transmission to the FDD cell 1601, that is, PUSCH and SRS transmission.

2) Method 2

Referring to FIG. 17, Method 2 is described below. Method 2 transmits an SRS symbol 1708 at a first symbol position of an UpPTS interval 1707 corresponding to two SC-FDMA symbol time lengths in a special subframe 1704 of the TDD cell 1702.

The SRS to be transmitted to the FDD cell 1701 is mapped to the last symbol in the subframe 1703 and transmitted (1710). For uplink data to be transmitted to the FDD cell 1701, uplink data channel-coded over a period except for the UpPTS section 1707 and the

RS symbol positions

1712 and 1713 in the subframe 1703 are included. The PUSCH is configured by rate matching and transmitted (1711). Accordingly, uplink signaling is not performed on the second symbol 1709 at the end of the subframe 1703.

Method 2 allows the SDD transmission to be performed in the TDD cell 1702, if possible, while reducing the PUSCH transmission loss that may occur due to the decrease in the number of symbols constituting the PUSCH transmitted in the FDD cell 1701. There is a feature that allows the base station to measure the channel condition.

3) Method 3

Referring to Fig. 18, Method 3 is described below. Method 3 transmits an SRS symbol 1808 at the first symbol position of the UpPTS interval 1807 corresponding to two SC-FDMA symbol time lengths in the special subframe 1804 of the TDD cell 1802. In the case of the FDD cell 1801, the SRS is mapped to the last symbol 1810 in the subframe 1803 and transmitted. In the subframe 1803 of the FDD cell 1801, a PUSCH is formed by rate matching channel-coded uplink data for the remaining intervals except for the symbol 1810 to which the SRS is mapped and the

RS symbol positions

1811 and 1812. And transmit (1809).

However, at the SRS symbol position 1808 of the TDD cell 1802, which simultaneously transmits an uplink signal to the FDD cell 1801 and the TDD cell 1802, transmission of an uplink signal transmitted to the FDD cell 1801 is performed. The transmit power of each uplink signal may be adjusted so that the sum of the power and the transmit power of the uplink signal transmitted to the TDD cell 1802 remains within the maximum allowable transmit power of the terminal. In this case, as in the fourth method of the third embodiment, the transmission power may be adjusted by defining priorities for each cell or for each signal type transmitted in the uplink.

In general, the PUSCH transmission power is kept constant within a subframe as long as the PUSCH is transmitted to facilitate receiver operation. Accordingly, when the PUSCH transmit power is adjusted and transmitted at a position corresponding to the SRS symbol position 1808 in the FDD cell 1801, the adjusted PUSCH transmit power value is determined in the UpPTS period 1807. The same can be applied to the SC-FDMA symbol period overlapping the position where the SRS symbol 1808 is transmitted, as well as the remaining symbol intervals in which the PUSCH is transmitted in the subframe.

Similarly to the first embodiment, which of the methods 1 to 3 may be defined in advance, or the base station may notify the terminal by notifying the terminal through higher layer signaling. Alternatively, depending on whether the PUSCH is initial transmission or retransmission, one of the methods 1 to 3 may be defined. For example, if the PUSCH is the initial transmission, the method 1 of prioritizing the PUSCH transmission may be applied. If the PUSCH is the retransmission, the method 2 of the priority of the SRS transmission may be applied. If the PUSCH is retransmission, since the probability of success of decoding the PUSCH can be increased through HARQ processing in which the base station receiver combines the initial transmission PUSCH and the retransmission PUSCH, a priority can be given to SRS transmission during the retransmission of the PUSCH. .

A fifth embodiment defines a specific operation for a case where a UE intends to transmit an SRS to a TDD cell while simultaneously transmitting a PUSCH including uplink control information (UCI) to an FDD cell under the conditions as shown in FIG. 4. do.

UCI is uplink control information transmitted by a user equipment to a base station. The channel quality indicator (CQI) indicates ACK / NACK indicating downlink data transmitted by the base station to the user equipment and indicates downlink channel state information. A rank indicator (RI) indicating the rank information of the downlink channel, a pre-coding matrix indicator (PMI) indicating the precoding information, and the like. In this case, ACK / NACK and RI among the UCI require a relatively higher reception performance than other UCI. Therefore, when ACK / NACK and RI are multiplexed with uplink data in the PUSCH, the mapping position in the time domain is fixed to be arranged around the RS, thereby obtaining a relatively high channel estimation gain and, as a result, a relatively high reception performance. You can do that.

Referring to FIG. 19, ACK / NACK may be multiplexed with uplink data at symbol positions 1915, 1916, 1919, and 1920 directly adjacent to

RSs

1909 and 1910 in a subframe. The RI may be multiplexed with uplink data at symbol positions 1914, 1917, 1918, and 1921 adjacent to the mapping positions of the ACK / NACK.

If the SRS is transmitted in the UpPTS section 1907 of the TDD cell 1902, uplink signaling is performed at a symbol 1921 to which the RI can be mapped, according to the first to fourth embodiments. There is an impossible way. Therefore, when the RI is multiplexed with the uplink data and transmitted, a method of guaranteeing transmission of the symbol 1921 may be applied. That is, in the case of the first embodiment, the method 1, the method 3, the method 4, and the second embodiment, the method 1, the method 3, and the third embodiment, the method 1, the method 4, the fourth embodiment, the method 1, Method 3 can be applied.

Referring to FIG. 20, in step 2001, the base station may set a transmission period, an SRS transmission resource, and the like as control information on SRS transmission of the terminal and notify the terminal. The control information may be configured by higher layer signaling.

Then, in step 2002, the base station schedules to transmit the PUSCH in the n-th subframe to the terminal. In step 2003, the base station determines whether the transmission time points of the PUSCH and the SRS of the UE overlap in the nth subframe.

If the transmission time points of the PUSCH and the SRS of the UE do not overlap, the process proceeds to step 2005 to receive the PUSCH transmitted by the UE in the nth subframe.

However, if the transmission time points of the PUSCH and the SRS of the UE overlap in the nth subframe, the process proceeds to step 2004 to receive the PUSCH and the SRS from the UE by applying the method described in detail in the first to fifth embodiments. can do. Detailed description thereof will be omitted. Specifically, which method is to be applied in advance between the terminal and the base station, or the base station may inform the terminal through higher layer signaling. The higher layer signaling may be performed before step 2002 in which the base station schedules the PUSCH to the UE.

Referring to FIG. 21, in step 2101, the UE may acquire a transmission period, resources for SRS transmission, and the like, as control information for SRS transmission from the base station. The control information may be configured by higher layer signaling.

Then, in step 2102, the UE is scheduled to transmit the PUSCH in the n-th subframe from the base station. In step 2103, the UE determines whether the transmission time points of the PUSCH and the SRS overlap in the nth subframe.

If the transmission time points of the PUSCH and the SRS of the UE do not overlap, the UE proceeds to step 2105 and the UE can transmit the PUSCH in the nth subframe.

However, if the transmission time points of the PUSCH and the SRS of the UE overlap in the nth subframe, the UE proceeds to step 2104 to transmit the PUSCH and the SRS by applying the method described in detail in the first to fifth embodiments. . Detailed description thereof will be omitted.

For convenience of description, devices not directly related to the present invention will be omitted. Referring to FIG. 22, the UE includes an FDD cell transmitter 2230 including a PUSCH block 2231, a multiplexer 2233, and a transmission RF block 2235, an SRS block 2251, a multiplexer 2253, and a transmission. A TDD cell transmitter 2250 including an RF block 2255 and a controller 2210 may be included. The controller 2210 configures each of the FDD cell transmitter 2230 and the TDD cell transmitter 2250 according to the detailed method of the above-described embodiments for the PUSCH transmission and the SRS transmission operation of the terminal with reference to the control information received from the base station. You can control the blocks.

In the FDD cell transmitter 2230, the PUSCH block 2231 generates a PUSCH by performing a process such as channel coding and modulation on uplink data. If there is another uplink transmission signal transmitted to the FDD cell, the UE multiplexes the generated PUSCH with another uplink transmission signal transmitted from the multiplexer 2233 to the FDD cell and then processes the signal in the transmission RF block 2235. After that, transmit to the base station.

In the TDD cell transmitter 2250, the SRS block 2251 generates an SRS signal according to a base station configuration. If there is another uplink transmission signal transmitted to the TDD cell, the UE multiplexes the generated SRS with the other uplink transmission signal transmitted from the multiplexer 2253 to the TDD cell and then processes the signal in the transmit RF block 2255. After that, transmit to the base station.

Referring to FIG. 23, a base station includes an FDD cell receiver 2330 including a PUSCH block 2331, a demultiplexer 2333, and a reception RF block 2335, an SRS block 2351, a demultiplexer 2353, and a reception unit. A TDD cell receiver 2350 including an RF block 2355 and a controller 2310 may be included. The controller 2310 controls each operation block of the FDD cell receiver 2330 and the TDD cell receiver 2350 according to the specific method of the above-described embodiments in order to control the reception operation of the base station for the PUSCH and the SRS transmitted by the terminal. Can control them.

The FDD cell receiver 2330 processes the signal received from the UE in the received RF block 2335, separates the PUSCH signal through the demultiplexer 2333, and then demodulates, decodes the channel, etc. in the PUSCH block 2331. The uplink data is obtained by performing the process of.

The TDD cell receiver 2350 processes the signal received from the terminal in the received RF block 2355, separates the SRS signal through the demultiplexer 2353, and then uplink channel state information in the SRS block 2351. Acquire.

Sixth Embodiment

24 is a view showing a method of the sixth embodiment of the present invention.

In the sixth embodiment, the UE simultaneously transmits uplink control information (UCI) through a physical uplink control channel (PUCCH) 2411, which is a physical channel for transmitting control information to the FDD cell 2401, and simultaneously a TDD cell 2402. ) Defines a specific operation for the case where the SRS is to be transmitted. Since the detailed description of the UCI has been described in the part related to the fifth embodiment, a description thereof will be omitted.

1) Method 1

Method 1 is a case where the transmission interval of the SRS is the last one symbol in a subframe.

Referring to FIG. 24, when the transmission time points of the PUCCH and the SRS 2409 overlap in the same subframe, a short PUCCH format that does not transmit the last one symbol period 2410 in the subframe of the PUCCH 2411 is performed. Apply. Accordingly, the UE may transmit the UCI through the shortened PUCCH format for the remaining time interval except for the last symbol period 2410. The terminal transmits an SRS 2409 in the last symbol period of the subframe. Through this operation, the PUCCH 2411 and the SRS 2409 can be prevented from occurring at the same time, so that the sum of the instantaneous transmission powers of the UEs can be maintained within the maximum allowable transmission powers of the UEs.

In this case, whether the terminal uses the shortened PUCCH format may be notified in advance by signaling from the base station. According to an embodiment, if the UE is notified from the base station not to use the shortened PUCCH format, the UE transmits the PUCCH for the entire time interval of the subframe if the transmission time of the PUCCH and SRS overlaps the same subframe, and the SRS May not transmit.

2) Method 2

Method 2 is a case where the transmission interval of the SRS is the last two symbols or the last two symbols in the subframe.

In this case, as in the case of FIG. 4, the UpPTS 407 of the special subframe of the TDD cell 402 is set by two SC-FDMA symbol lengths, and the TDD cell 402 is spread over two symbols of the UpPTS 407. When the SRS transmission is performed or when the SRS transmission of the TDD cell 402 is performed in the first symbol interval of the UpPTS 407, it is necessary to define an operation different from the method 1.

That is, when the UE is notified from the base station to use the shortened PUCCH format, the UE, if the transmission time of the PUCCH 2411 and the SRS overlap in the same subframe, remaining time except for the last one symbol interval 2410 of the subframe UCI can be transmitted through the shortened PUCCH format during the interval. The terminal transmits the SRS 2409 of the TDD cell 2402 in the last symbol period of the subframe. The SRS of the TDD cell 2402, which is scheduled to be transmitted from the end of the subframe to the second symbol period 2408, is not transmitted.

On the other hand, if the UE is notified by the base station not to use the shortened PUCCH format, the UE transmits the PUCCH 2411 for the entire time period of the subframe, if the PUCCH and SRS transmission time overlaps the same subframe, SRS is transmitted I never do that.

The method 2 when the use of the shortened PUCCH format is set in the terminal will be described in detail with reference to FIG. 24.

When the UE is configured to use the shortened PUCCH format, the UE may perform a first SRS symbol 2408 among UpPTS intervals 2407 corresponding to two SC-FDMA symbol time lengths in a special subframe 2404 of the TDD cell 2402. ) May transmit the second SRS symbol 2409. In this case, the FDD cell 2401 does not transmit the PUCCH in the last SC-FDMA symbol period 2410 where the transmission time point overlaps with the second SRS symbol 2409 of the UpPTS period 2407. In the corresponding subframe 2403 of the FDD cell 2401, a shortened PUCCH format of the channel coded UCI is performed for the remaining time interval except for the last SC-FDMA symbol position 2410 and the

RS symbol positions

2412 and 2413. The applied PUCCH 2411 may be configured and transmitted. In this case, the

RS symbol positions

2412 and 2413 during PUCCH transmission may be different from the RS symbol positions during PUSCH transmission (for example, 512 and 513 in the example illustrated in FIG. 5).

Referring to FIG. 25, in step 2501, the base station sets PUCCH transmission control information of the terminal and notifies the terminal. The control information may include control information such as whether the terminal uses the shortened PUCCH format. According to an embodiment, the control information may be configured by higher layer signaling.

In step 2502, the base station may set a transmission period, an SRS transmission resource, and the like as control information on SRS transmission of the terminal and notify the terminal. According to an embodiment, the control information may be configured by higher layer signaling.

In some embodiments, the order of

steps

2501 and 2502 may be reversed, or may be simultaneously performed.

Then, in step 2503, the base station determines whether the transmission time of the PUCCH and SRS for the UCI transmission of the terminal overlaps in the n-th subframe (subframe #n) to receive the uplink signal from the terminal. At this time, the base station may determine the SRS transmission time of the terminal according to the information set in step 2502. According to an embodiment, when the base station transmits downlink data to the terminal at the time of subframe # n-4 corresponding to the subframe #n, the base station performs HARQ-ACK / PU / CH / PUCCH on the subframe #n. It can be seen that the transmission including the NACK.

If the transmission time points of the PUCCH and the SRS of the UE do not overlap, the process proceeds to step 2506 to receive the PUCCH transmitted by the UE in the subframe #n. In this case, the PUCCH is a general PUCCH rather than a shortened PUCCH format.

However, if the transmission time point of the PUCCH and the SRS of the UE overlaps in the subframe #n, the base station can determine whether to use the shortened PUCCH format in step 2504.

If the terminal uses the shortened PUCCH format, the base station may receive the PUCCH and SRS to which the shortened PUCCH format is applied according to the method 1 or the method 6 of the sixth embodiment from the terminal in step 2505. That is, when the transmission period of the SRS is the last one symbol in the subframe, the method 1 of the sixth embodiment is followed, and when the transmission period of the SRS is the last two symbols or the last to second symbol in the special subframe, the sixth embodiment According to the example 2, the PUCCH and the SRS may be received. Detailed description thereof will be omitted.

However, if it is determined in step 2504 that the terminal does not use the shortened PUCCH format, the base station proceeds to step 2506 and can receive the PUCCH transmitted by the terminal. In this case, the PUCCH is a general PUCCH rather than a shortened PUCCH format.

Referring to FIG. 26, in step 2601, the UE acquires PUCCH transmission related configuration information from the base station. The configuration information may include control information such as whether the terminal uses the shortened PUCCH format.

In operation 2602, the UE may acquire a transmission period, resources for SRS transmission, and the like, as control information for SRS transmission from the base station. According to an embodiment, the control information may be configured by higher layer signaling.

According to an embodiment, the order of

steps

2601 and 2602 may be reversed or may be simultaneously performed.

Thereafter, in step 2603, the UE determines whether transmission time points of the PUCCH and the SRS overlap in the nth subframe (subframe #n). In this case, the terminal may determine the SRS transmission time according to the SRS configuration information obtained in step 2602. According to an embodiment, when the base station transmits downlink data to the UE at subframe # n-4 corresponding to the subframe #n, the UE performs HARQ-ACK / NACK on the subframe #n through PUCCH. Can be transmitted.

If the transmission time point of the PUCCH and the SRS of the UE do not overlap, the UE proceeds to step 2606 and the UE can transmit the PUCCH in subframe #n. In this case, the PUCCH is a general PUCCH rather than a shortened PUCCH format.

However, if the transmission time point of the PUCCH and the SRS of the UE overlaps in the subframe #n, the UE may proceed to step 2604 to determine whether to use the shortened PUCCH format according to the configuration information of the base station.

If the UE is configured to use the shortened PUCCH format from the base station, the UE may transmit the PUCCH and SRS to which the shortened PUCCH format is applied according to Method 1 or Method 2 of the sixth embodiment in step 2605. That is, when the transmission period of the SRS is the last one symbol in the subframe, the method 1 of the sixth embodiment is followed. When the transmission period of the SRS is the last two symbols or the last to second symbol in the special subframe, the sixth According to the method 2 of the embodiment, the PUCCH and the SRS may be received. Detailed description thereof will be omitted.

However, when it is determined in step 2604 that the BS does not use the shortened PUCCH format, the UE may proceed to step 2606 to transmit the PUCCH. In this case, PUCCH is a general PUCCH rather than a shortened PUCCH format.

For convenience of description, devices not directly related to the present invention will be omitted. Referring to FIG. 27, the UE includes an FDD cell transmitter 2730 including a PUCCH block 2731, a multiplexer 2735, and a transmit RF block 2735, an SRS block 2723, a multiplexer 2735, and a transmitter. A TDD cell transmitter 2750 including an RF block 2755 and a controller 2710 may be included. The controller 2710 according to the detailed method of the sixth embodiment of the PUCCH transmission and the SRS transmission operation of the terminal with reference to the control information received from the base station, each of the FDD cell transmitter 2730 and the TDD cell transmitter 2750 You can control the building blocks.

In the FDD cell transmitter 2730, the PUCCH block 2731 generates a PUCCH by performing a process such as channel coding and modulation on the UCI. If there is another uplink transmission signal transmitted to the FDD cell, the UE multiplexes the generated PUCCH with another uplink transmission signal transmitted from the multiplexer 2333 to the FDD cell, and then processes the signal in the transmission RF block 2735. After that, transmit to the base station.

In the TDD cell transmitter 2750, the SRS block 2751 generates an SRS signal according to a base station configuration. If there is another uplink transmission signal transmitted to the TDD cell, the UE multiplexes the generated SRS with the other uplink transmission signal transmitted from the multiplexer 2753 to the TDD cell and then processes the signal in the transmission RF block 2755. After that, transmit to the base station.

Although not shown, the FDD cell transmitter 2730 of the UE may further include a PUSCH block. In this case, the controller 2710 refers to the control information received from the base station and the FDD cell transmitter 2730 and the TDD according to the specific methods of the first to fifth embodiments described above with respect to the PUSCH transmission and the SRS transmission operation of the terminal. Each component block of the cell transmitter 2750 may be controlled.

28 is a diagram illustrating a reception device of a base station according to another embodiment of the present invention.

Referring to FIG. 28, the base station includes an FDD cell receiver 2830 including a PUCCH block 2831, a demultiplexer 2833, and a receive RF block 2835, an SRS block 2851, a demultiplexer 2853, and a reception unit. A TDD cell receiver 2850 including an RF block 2855 and a controller 2810 may be included. The controller 2810 controls each receiving block of the FDD cell receiver 2830 and the TDD cell receiver 2850 according to the specific method of the sixth embodiment in order to control the reception operation of the base station for the PUCCH and the SRS transmitted by the terminal. Can control them.

The FDD cell receiver 2830 performs signal processing on the received RF block 2835 in the received RF block 2835, separates the PUCCH signal through the demultiplexer 2833, and then demodulates, decodes the channel, etc. in the PUCCH block 2831. Acquire UCI by following the process of.

The TDD cell receiver 2850 processes the signal received from the UE in the received RF block 2855, separates the SRS signal through the demultiplexer 2853, and then uplink channel state information in the SRS block 2851. Acquire.

Although not shown, the FDD cell receiver 2830 of the base station may further include a PUSCH block. At this time, the controller 2810 controls the reception operation of the base station for the PUSCH and SRS transmitted by the terminal, according to the specific method of the first to fifth embodiments described above, the FDD cell receiver 2830 and the TDD cell Each component block of the receiver 2850 may be controlled.

On the other hand, the embodiments of the present invention disclosed in the specification and drawings are merely presented specific examples to easily explain the technical contents of the present invention and help the understanding of the present invention, and are not intended to limit the scope of the present invention. That is, it will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be implemented.

Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

Claims

In a communication method of a terminal in a communication system supporting a combination of a component carrier applying the FDD scheme and a component carrier applying the TDD scheme,

Receiving SRS transmission configuration information from a base station;

Receiving uplink data scheduling information from the base station;

Determining whether simultaneous transmission of the SRS and the uplink data occurs; And

In case of simultaneous transmission of the SRS transmission and the uplink data, the sum of the transmission powers of the first symbol, the second symbol of the FDD cell, and the first symbol and the second symbol of the TDD cell is used to determine the maximum transmission power of the UE. Setting up transmission of the uplink data or the SRS so as not to exceed;

Including,

The timing of the first symbol of the FDD cell corresponds to the timing of the first symbol of the TDD cell, and the timing of the second symbol of the FDD cell corresponds to the timing of the second symbol of the TDD cell Communication method.
The method of claim 1, wherein the setting comprises:

Set not to transmit data in the second symbol of the FDD cell and the first symbol of the TDD cell, and set to transmit the uplink data or SRS in the first symbol of the FDD cell and the second symbol of the TDD cell A communication method of a terminal, characterized in that.
The method of claim 1, wherein the setting comprises:

And not transmitting data in the first and second symbols of the FDD cell, and transmitting the SRS in at least one of the first and second symbols of the TDD cell. .
The method of claim 1, wherein the setting comprises:

And transmitting the uplink data in the first symbol and the second symbol of the FDD cell and not transmitting the SRS in the first and second symbols of the TDD cell. .
The method of claim 1, wherein the setting comprises:

Setting to transmit the uplink data in a first symbol and a second symbol of the FDD cell, and setting to transmit the SRS in at least one of the first and second symbols of the TDD cell;

Determining whether the sum of transmit powers for each of the first and second symbols of the FDD cell and the first and second symbols of the TDD cell exceeds a maximum transmit power of the terminal; And

Transmitting power of at least one of a first symbol and a second symbol of the FDD cell and a first symbol and a second symbol of the TDD cell, the first symbol, the second symbol, and the first symbol of the TDD cell; Adjusting a sum of transmit powers for each second symbol not to exceed a maximum transmit power of the terminal;

Communication method of a terminal comprising a.
The method of claim 1, wherein the setting comprises:

Set to transmit the uplink data in the first symbol of the FDD cell and SRS in the second symbol of the FDD cell, and the second symbol of the TDD cell without transmitting the SRS in the first symbol of the TDD cell Set to transmit SRS, and adjust so that the sum of the transmission powers of the second symbol of the FDD cell and the second symbol of the TDD cell does not exceed the maximum transmission power of the terminal.
The method of claim 1, wherein the setting comprises:

Set to transmit the SRS in the second symbol of the FDD cell without transmitting the uplink data in the first symbol of the FDD cell, set to transmit the SRS in the first and second symbols of the TDD cell, And controlling the sum of the transmission powers of the second symbol of the FDD cell and the second symbol of the TDD cell not to exceed the maximum transmission power of the terminal.
The method of claim 1, wherein the setting comprises:

Set to transmit the uplink data in the first symbol of the FDD cell and transmit the SRS in the second symbol of the FDD cell, set to transmit the SRS in the first and second symbols of the TDD cell, and Transmit power of at least one of a first symbol and a second symbol of an FDD cell, and a first symbol and a second symbol of the TDD cell, and a first symbol, a second symbol, and a first symbol of the TDD cell, and And adjusting the sum of transmission powers for each of two symbols so as not to exceed the maximum transmission power of the terminal.
A communication method of a base station in a communication system supporting a combination of a component carrier applying the FDD scheme and a component carrier applying the TDD scheme,

Transmitting SRS transmission setting information to a terminal;

Transmitting uplink data scheduling information to the terminal;

Including,

The SRS transmission configuration information and the uplink data scheduling information may include a first symbol, a second symbol, and a first symbol and a second symbol of an FDD cell when simultaneous transmission of the SRS and the uplink data occurs. Includes configuration information for setting the transmission of the uplink data or the SRS so that the sum of the transmission power for each does not exceed the maximum transmission power of the terminal,

The timing of the first symbol of the FDD cell corresponds to the timing of the first symbol of the TDD cell, the timing of the second symbol of the FDD cell corresponds to the timing of the second symbol of the TDD cell Communication method.
The method of claim 9, wherein the setting information,

Set not to transmit data in the second symbol of the FDD cell and the first symbol of the TDD cell, and set to transmit the uplink data or SRS in the first symbol of the FDD cell and the second symbol of the TDD cell Communication method of a base station, characterized in that the information.
The method of claim 9, wherein the setting information,

Communication information of a base station configured to not transmit data in a first symbol and a second symbol of the FDD cell and to transmit the SRS in at least one of the first and second symbols of the TDD cell. Way.
The method of claim 9, wherein the setting information,

Communication information of a base station configured to transmit the uplink data in the first and second symbols of the FDD cell and not to transmit the SRS in the first and second symbols of the TDD cell. Way.
The method of claim 9, wherein the setting information,

Set to transmit the uplink data in the first and second symbols of the FDD cell, and set to transmit the SRS in at least one of the first and second symbols of the TDD cell, and Transmit power of at least one of a first symbol and a second symbol, and a first symbol and a second symbol of the TDD cell to a first symbol, a second symbol, and a first symbol, a second symbol of the TDD cell, respectively. Communication information of a base station configured to adjust the sum of the transmission powers of the terminals so as not to exceed the maximum transmission power of the terminal.
The method of claim 9, wherein the setting information,

Set to transmit the uplink data in the first symbol of the FDD cell and SRS in the second symbol of the FDD cell, and the second symbol of the TDD cell without transmitting the SRS in the first symbol of the TDD cell Is configured to transmit the SRS, and is configured to adjust the sum of the transmission powers of the second symbol of the FDD cell and the second symbol of the TDD cell so as not to exceed the maximum transmission power of the terminal. Communication method.
The method of claim 9, wherein the setting information,

Set to transmit the SRS in the second symbol of the FDD cell without transmitting the uplink data in the first symbol of the FDD cell, set to transmit the SRS in the first and second symbols of the TDD cell, And the sum of the transmission powers of the second symbol of the FDD cell and the second symbol of the TDD cell is information set to be adjusted so as not to exceed the maximum transmission power of the terminal.
The method of claim 9, wherein the setting information,

Set to transmit the uplink data in the first symbol of the FDD cell and transmit the SRS in the second symbol of the FDD cell, set to transmit the SRS in the first and second symbols of the TDD cell, and Transmit power of at least one of a first symbol and a second symbol of an FDD cell, and a first symbol and a second symbol of the TDD cell, and a first symbol, a second symbol, and a first symbol of the TDD cell, and And the sum of the transmission powers for each of the two symbols is information set so as not to exceed the maximum transmission power of the terminal.
In a terminal of a communication system supporting a combination of a component carrier applying the FDD scheme and a component carrier applying the TDD scheme,

Communication unit for communicating with the base station; And

Receive SRS transmission configuration information from the base station, receive uplink data scheduling information from the base station, determine whether the simultaneous transmission of the SRS transmission and the uplink data occurs, the SRS transmission and the uplink data In case of simultaneous transmission of the uplink, the uplink of the first symbol, the second symbol of the FDD cell and the first symbol of the TDD cell, and the second symbol of the second symbol do not exceed the maximum transmission power of the terminal. A control unit controlling to set transmission of data or the SRS;

Including,

The timing of the first symbol of the FDD cell corresponds to the timing of the first symbol of the TDD cell, and the timing of the second symbol of the FDD cell corresponds to the timing of the second symbol of the TDD cell .
The method of claim 17, wherein the control unit,

Set not to transmit data in the second symbol of the FDD cell and the first symbol of the TDD cell, and set to transmit the uplink data or SRS in the first symbol of the FDD cell and the second symbol of the TDD cell Terminal for controlling to.
The method of claim 17, wherein the control unit,

And not to transmit data in the first and second symbols of the FDD cell, and controlling to transmit the SRS in at least one of the first and second symbols of the TDD cell.
The method of claim 17, wherein the control unit,

And configured to transmit the uplink data in the first symbol and the second symbol of the FDD cell and to not transmit the SRS in the first and second symbols of the TDD cell.
The method of claim 17, wherein the control unit,

Set to transmit the uplink data in the first and second symbols of the FDD cell, and set to transmit the SRS in at least one of the first and second symbols of the TDD cell, and It is determined whether the sum of the transmission powers for the first symbol and the second symbol and the first symbol and the second symbol of the TDD cell exceeds the maximum transmission power of the terminal, and the first symbol and the second symbol of the FDD cell. And a transmission power of at least one of the first symbol and the second symbol of the TDD cell is equal to the sum of the transmission powers of the first symbol, the second symbol, and the first symbol, the second symbol of the TDD cell. And controlling the terminal so as not to exceed the maximum transmit power of the terminal.
The method of claim 17, wherein the control unit,

Set to transmit the uplink data in the first symbol of the FDD cell and SRS in the second symbol of the FDD cell, and the second symbol of the TDD cell without transmitting the SRS in the first symbol of the TDD cell Set to transmit the SRS, and controls to adjust so that the sum of the transmission powers of the second symbol of the FDD cell and the second symbol of the TDD cell does not exceed the maximum transmission power of the terminal.
The method of claim 17, wherein the control unit,

Set to transmit the SRS in the second symbol of the FDD cell without transmitting the uplink data in the first symbol of the FDD cell, set to transmit the SRS in the first and second symbols of the TDD cell, And controlling the sum of the transmission powers of the second symbol of the FDD cell and the second symbol of the TDD cell not to exceed the maximum transmission power of the terminal.
The method of claim 17, wherein the control unit,

Set to transmit the uplink data in the first symbol of the FDD cell and transmit the SRS in the second symbol of the FDD cell, set to transmit the SRS in the first and second symbols of the TDD cell, and Transmit power of at least one of a first symbol and a second symbol of an FDD cell, and a first symbol and a second symbol of the TDD cell, and a first symbol, a second symbol, and a first symbol of the TDD cell, and And controlling the sum of the transmission powers for each of the two symbols not to exceed the maximum transmission power of the terminal.
A base station of a communication system supporting a combination of a component carrier using an FDD scheme and a component carrier using a TDD scheme,

Communication unit for communicating with the terminal; And

A control unit which transmits SRS transmission configuration information to the terminal and controls to transmit uplink data scheduling information to the terminal;

Including,

The SRS transmission configuration information and the uplink data scheduling information may include a first symbol, a second symbol, and a first symbol and a second symbol of an FDD cell when simultaneous transmission of the SRS and the uplink data occurs. Includes configuration information for setting the transmission of the uplink data or the SRS so that the sum of the transmission power for each does not exceed the maximum transmission power of the terminal,

The timing of the first symbol of the FDD cell corresponds to the timing of the first symbol of the TDD cell, the timing of the second symbol of the FDD cell corresponds to the timing of the second symbol of the TDD cell .
The method of claim 25, wherein the setting information,

Set not to transmit data in the second symbol of the FDD cell and the first symbol of the TDD cell, and set to transmit the uplink data or SRS in the first symbol of the FDD cell and the second symbol of the TDD cell Base station, characterized in that the information.
The method of claim 25, wherein the setting information,

And base station configured to not transmit data in the first and second symbols of the FDD cell and to transmit the SRS in at least one of the first and second symbols of the TDD cell.
The method of claim 25, wherein the setting information,

And a base station configured to transmit the uplink data in the first and second symbols of the FDD cell and not to transmit the SRS in the first and second symbols of the TDD cell.
The method of claim 25, wherein the setting information,

Set to transmit the uplink data in the first and second symbols of the FDD cell, and set to transmit the SRS in at least one of the first and second symbols of the TDD cell, and Transmit power of at least one of a first symbol and a second symbol, and a first symbol and a second symbol of the TDD cell to a first symbol, a second symbol, and a first symbol, a second symbol of the TDD cell, respectively. The base station, characterized in that the information is set to adjust so that the sum of the transmission power for the maximum transmission power of the terminal does not exceed.
The method of claim 25, wherein the setting information,

Set to transmit the uplink data in the first symbol of the FDD cell and SRS in the second symbol of the FDD cell, and the second symbol of the TDD cell without transmitting the SRS in the first symbol of the TDD cell The base station, characterized in that configured to transmit the SRS, and adjusted so that the sum of the transmission power of the second symbol of the FDD cell and the second symbol of the TDD cell does not exceed the maximum transmission power of the terminal.
The method of claim 25, wherein the setting information,

Set to transmit the SRS in the second symbol of the FDD cell without transmitting the uplink data in the first symbol of the FDD cell, set to transmit the SRS in the first and second symbols of the TDD cell, And a base station configured to adjust a sum of transmission powers of a second symbol of the FDD cell and a second symbol of the TDD cell so as not to exceed a maximum transmission power of the terminal.
The method of claim 25, wherein the setting information,

Set to transmit the uplink data in the first symbol of the FDD cell and transmit the SRS in the second symbol of the FDD cell, set to transmit the SRS in the first and second symbols of the TDD cell, and Transmit power of at least one of a first symbol and a second symbol of an FDD cell, and a first symbol and a second symbol of the TDD cell, and a first symbol, a second symbol, and a first symbol of the TDD cell, and And a base station configured to adjust a sum of transmission powers for each of two symbols so as not to exceed a maximum transmission power of the terminal.