KR101413800B1 - Method and apparatus for transmission and reception of control information in mobile telecommunication system - Google Patents

Abstract

The present invention proposes a method and apparatus for transmitting and receiving control information in a mobile communication system. The present invention defines a transmission structure for improving channel estimation performance with respect to control information to be transmitted, thereby increasing the reliability of reception of the control information.

LTE, CQI, ACK / NACK, channel estimation, frequency hopping

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method and apparatus for transmitting and receiving control information in a mobile communication system,

The present invention relates to a mobile communication system, and more particularly, to a method and apparatus for transmitting / receiving control information between a base station and a mobile station in a mobile communication system.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a mobile communication system, and more particularly, to a method and apparatus for transmitting high- Carrier-Frequency Division Multiple Access (SC-FDMA) scheme has been actively researched. Currently, 3GPP (3 ^rd Generation Partnership Project), an asynchronous cellular mobile communication standard group, is studying LTE (Long Term Evolution) or E-UTRA (Evolved Universal Terrestrial Radio Access) systems based on the above multiple access scheme.

In the above multiple access scheme, data or control information of each user is distinguished by assigning and operating so that time-frequency resources for transmitting data or control information for each user do not overlap each other, that is, orthogonality is established . In the case of a control channel, code resources can be further allocated to distinguish control information of each user.

In the LTE system, uplink control information includes ACK (acknowledgment) / NACK (negative acknowledgment) feedback information, which is a signal for responding to the successful reception of downlink data transmission, CQI (Channel Quality Feedback information necessary for operation of a multiple input / multiple output (MIMO) antenna, or a combination of the ACK / NACK, CQI, and MIMO feedback information. The ACK / NACK information is generally composed of 1-bit, and is repeatedly transmitted (repetition) in order to improve reception performance and expand cell coverage. In a system to which MIMO is applied, ACK / NACK information is transmitted for each codeword of MIMO. Generally, the CQI information is composed of a plurality of bits to represent a channel state. The CQI information includes a wide band CQI representing a channel state for the entire system transmission band and a subband CQI representing a channel state for a subband obtained by dividing a system transmission band by a predetermined small unit . Generally, since the subband CQI includes an indicator indicating which subband is referred to and a channel state value for the corresponding subband, more bits are required to represent the subband CQI than the wideband CQI. The CQI information is channel-coded and transmitted in order to improve reception performance and cell coverage, and a block coding or a convolutional coding scheme is applied.

In the LTE system, the transmission format of uplink control information is classified according to the presence or absence of data transmission. When data and control information are simultaneously transmitted in the uplink, the data and control information are time-division multiplexed (TDM) and are mapped to a time-frequency resource allocated for data transmission and transmitted. On the other hand, when only control information is transmitted without data transmission, the allocated specific frequency band is used for control information transmission. The physical channel for transmitting only the control information has been defined as a Physical Uplink Control Channel (PUCCH) as discussed in the standard conference to date. The PUCCH is mapped to the allocated specific frequency band. Hereinafter, a concrete transmission structure of the PUCCH will be described with reference to FIG.

1 is a diagram illustrating a transmission structure of a PUCCH, which is a physical channel for transmitting control information in an uplink in a 3GPP LTE system. In FIG. 1, the horizontal axis represents a time domain and the vertical axis represents a frequency domain. The range of the time domain is one subframe 102, and the range of the frequency domain is the system transmission bandwidth 110. [

Referring to FIG. 1, a subframe 102, which is a basic transmission unit of an uplink, has a length of 1 ms and one subframe is composed of two slots 104 and 106 each having a length of 0.5 ms. Each of the slots 104 and 106 is composed of a plurality of SC-FDMA symbols 111 to 124 and 131 to 144. In FIG. 1, one slot is composed of 7 SC-FDMA symbols.

The smallest unit in the frequency domain is a subcarrier, and the basic units of resource allocation are resource blocks (RBs) 108 and 109. The RBs 108 and 109 are composed of a plurality of sub-carriers and a plurality of SC-FDMA symbols. Here, an example is shown in which 12 subcarriers and 7 SC-FDMA symbols constituting one slot constitute one RB. Referring to FIG. 1, a frequency band to which the PUCCH is mapped corresponds to RBs 108 and 109 located at both ends of the system transmission band 110.

In general, the PUCCH is mapped to two consecutive RBs in a time domain, and frequency hopping is applied on a slot basis to increase frequency diversity for one subframe. 1, control information # 1 is transmitted through a pre-allocated frequency band 108 in the first slot 104, and frequency hopping is applied as indicated by an arrow in the second slot 106, Band 109. < / RTI > The control information # 2 is transmitted through the pre-allocated frequency band 109 in the first slot 104 and the frequency hopping is applied as shown by the arrow in the second slot 106, Lt; / RTI > 1 shows an example in which frequency bands 108 and 109 corresponding to one RB located at both ends of a system transmission band are allocated for PUCCH transmission. However, in order to support a plurality of terminals, A frequency band corresponding to a plurality of RBs may be allocated for PUCCH transmission from the end.

1, SC-FDMA symbols 111, 113, 114, 115, 117, 138, 140, 141, 142 and 144, or SC-FDMA symbols 131, 133, 134, 135, The SC-FDMA symbols 112, 116, 139, and 143 or the SC-FDMA symbols 132, 136, 119, and 123 are transmitted with the control information included in the pilot symbols 137, 118, 120, 121, 122, (Also referred to as a reference signal (RS)) is transmitted. The pilot signal is composed of a predetermined sequence and is used for channel estimation for coherent demodulation at a receiving end. The number of SC-FDMA symbols for transmission of the control information, the number of SC-FDMA symbols for RS transmission, and corresponding positions in the subframe are examples, and may be changed according to the type of control information to be transmitted or the system operation .

Code division multiplexing (CDM) using a Zadoff-Chu (ZC) sequence in order to multiplex control information transmitted via the PUCCH among different users in the same RB. The Zadoff-Chu sequence has the characteristic that the circular autocorrelation for the non-zero shift is zero. Accordingly, a UE (User Equipment) (hereinafter, referred to as UE) that transmits control information using the same Zadoff-Chu sequence can distinguish cyclic shift values of the Zadoff-Chu sequences from each other.

In the case of transmitting the control information through the PUCCH, when the amount of the control information to be transmitted is small, since the control information is transmitted during one subframe, a sufficient error correction capability can be ensured, Reliability can be satisfied. However, when the amount of control information to be transmitted is large, it is necessary to transmit control information during a plurality of subframes in order to satisfy a predetermined required reception reliability due to restriction of the amount of information that can be transmitted during one subframe.

FIG. 2 shows an example in which frequency hopping is applied in slot units as in the case of FIG. 1 when the PUCCH is transmitted during a plurality of subframes. In FIG. 2, a frequency band corresponding to one RB located at both ends of a system transmission band is used for PUCCH transmission, and a PUCCH is transmitted over two subframes. That is, the UEs allocated with the PUCCH resources i (201, 204, 205, 208) transmit control information through the PUCCH resources i (201, 204, 205, 208) The UEs allocated with the PUCCH resources 202, 203, 206, and 207 transmit control information through the PUCCH resources j 202, 203, 206, and 207 while frequency hopping every slot. The resource i or resource j indicates which slot in which PUCCH is mapped to which RB. Through the frequency hopping in the slot unit as described above, the control information undergoes the channel response for the entire frequency band occupied by the PUCCH, so that the frequency diversity gain can be maximized on the receiver side. However, from the viewpoint of the channel estimation of the receiver, there is a disadvantage that it is impossible to improve the channel estimation performance due to the limitation that the channel estimation is also applied in the slot unit in order to maintain the accuracy of the channel estimation. In particular, when the mobile station moves at a low speed, the channel change is insignificant in time, so that the channel estimation performance can be improved through a pilot signal received from several slots in the time domain. However, the PUCCH transmission scheme shown in FIG. The pilot signal of the adjacent slot can not be used for channel estimation because the channel change is large in the frequency domain due to the jump.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a control information transmitting / receiving method for improving reliability of receiving control information through channel estimation enhancement.

According to an embodiment of the present invention, there is provided a method for transmitting control information in a mobile communication system, the method comprising the steps of: determining a transmission format for transmission of the control information, And transmitting the control information to the base station using a transmission resource matched with the obtained transmission resource information so that frequency hopping is performed in one of a slot period and a subframe period according to the transmission format, .

According to an embodiment of the present invention, there is provided a method for transmitting control information in a mobile communication system, the method comprising: determining a transmission format for transmission of the control information determined in consideration of the amount of the control information and the rate of change of the channel state, Acquiring the resource information; and controlling the transmission of the control information using the transmission resource matched with the acquired transmission resource information, so as to hop at a frequency of a slot cycle starting from a frequency position according to a preset offset value, To the base station.

According to an embodiment of the present invention, there is provided a method for receiving control information in a mobile communication system, the method comprising: selecting a transmission format and a transmission resource for transmission of the control information according to the amount of the control information and the rate of change of the channel state; Receiving a signal transmitted in a slot cycle or a subframe period so as to hop at a frequency according to a transmission format notified to the terminal; and acquiring the control information from the received signal .

According to an embodiment of the present invention, there is provided a method for receiving control information in a mobile communication system, the method comprising: selecting a transmission format and a transmission resource for transmission of the control information according to the amount of the control information and the rate of change of the channel state; Receiving a signal transmitted in a slot cycle starting from a frequency position according to a preset offset value according to a transmission format notified to the terminal; And acquiring the information.

According to another aspect of the present invention, there is provided a terminal apparatus for transmitting control information in a mobile communication system, the apparatus comprising: a controller for obtaining a predetermined transmission format and transmission resource information for transmitting the control information from a base station; A control information generator for generating control information to be transmitted to the base station according to the transmission format determined in consideration of the amount of the control information and the rate of change of the channel state, And a channel mapping device for mapping the generated control information to transmission resources corresponding to the obtained transmission resource information, and transmitting the mapping.

According to another aspect of the present invention, there is provided a terminal apparatus for transmitting control information in a mobile communication system, the apparatus comprising: a controller for obtaining a predetermined transmission format and transmission resource information for transmitting the control information from a base station; A control information generator for generating control information to be transmitted to the base station according to the transmission format determined in consideration of the amount of the control information and the rate of change of the channel state, And mapping the generated control information to transmission resources matched with the obtained transmission resource information, and transmitting the mapping information.

According to an embodiment of the present invention, in a base station apparatus for receiving control information in a mobile communication system, a transmission format and a transmission resource for transmitting the control information are selected according to the amount of the control information and the rate of change of the channel state A channel demapper for receiving a signal transmitted through the selected transmission resource to hop in a frequency of one of a slot period and a subframe period according to the transmission format received from the controller; And a decoder for obtaining the control information.

According to an embodiment of the present invention, in a base station apparatus for receiving control information in a mobile communication system, a transmission format and a transmission resource for transmitting the control information are selected according to the amount of the control information and the rate of change of the channel state A channel demapper for receiving a signal transmitted through the selected transmission resource, the signal transmitted from the controller in a slot cycle starting from a frequency position according to a predetermined offset value according to the transmission format received from the controller; And a decoder for decoding the decoded signal to obtain the control information.

Effects obtained by representative ones of the inventions disclosed below will be briefly described as follows.

The present invention provides a control information transmission structure for improving channel estimation performance of control information to be transmitted, thereby reducing a bit error rate or a block error rate for control information and improving reliability.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an operation principle of an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

Although the present invention will be described with reference to an operation of transmitting control information in uplink in a cellular communication system based on the LTE system, the operation principle of the present invention is not limited to the transmission direction of a specific transmission system or control information Downlink).

The present invention proposes a method for improving reception reliability by improving channel estimation performance of control information to be transmitted. As described above, when a UE transmits a physical uplink control channel (PUCCH), which is a physical channel for transmitting control information, over a plurality of subframes, channel hopping performance can be improved by performing frequency hopping on a slot- There is no disadvantage. Therefore, the present invention proposes a method for improving reliability in transmitting control information during a plurality of subframes when the UE transmits control information via the PUCCH.

Hereinafter, the principle of operation of the present invention will be described with reference to FIG.

3 illustrates a case where a frequency band corresponding to one RB located at each end of a system transmission band is used for PUCCH transmission and a PUCCH is transmitted over two subframes. The main feature of the present invention shown in FIG. 3 is that the PUCCH for control information transmission performs a frequency hopping in units of subframes. That is, the UE having allocated the PUCCH resource i (301, 303, 306, 308) transmits control information through the PUCCH resource i (301, 303, 306, 308) the UEs allocated with the PUCCH resources j (302, 304, 305, and 307) transmit control information through the PUCCH resources j (302, 304, 305, and 307) while performing frequency hopping every subframe. In the slot-based frequency hopping scheme of FIG. 2 and the subframe-based frequency hopping scheme of FIG. 3, control information transmitted during the same two subframe time periods undergoes channel response for the entire frequency band occupied by the PUCCH, An equivalent effect can be obtained in terms of diversity gain. In addition, from the channel estimation viewpoint of the receiver, the scheme of FIG. 3 can improve channel estimation performance by utilizing all the pilot signals of adjacent slots in the subframe. This can be particularly useful when the UE moves at a low speed and the channel change is insignificant during one subframe period. That is, channel changes experienced by the PUCCH during one subframe in the time domain are insignificant and channel characteristics are similar because the PUCCH occupies the same frequency band during one subframe in the frequency domain, so that all the pilot signals within one subframe can be utilized Thereby improving the channel estimation performance. The receiver obtains the control information by estimating the channel state of the radio transmission path through which the control information is transmitted from the pilot signal constituted by a predetermined sequence between the transceivers and compensating the received signal. Therefore, the higher the accuracy of the channel estimation, the higher the reliability of reception of the control information.

1, when a limited amount of radio resources is shared between the pilot signal and the control information, the receiver estimates a channel value for a time interval during which the pilot signal is not mapped, from a channel estimation Method. In general, interpolation is performed on available pilot signals to perform channel estimation on symbols for which control information is mapped.

FIG. 4 illustrates a procedure in which a terminal transmits control information according to the present invention.

First, in step 402, the UE acquires the transmission format of the PUCCH for control information transmission. The PUCCH transmission format is divided into 'PUCCH transmission format A' in which frequency hopping is performed on a slot basis and 'PUCCH transmission format B' in which frequency hopping is performed on a subframe basis. The PUCCH transmission format may be set from a predetermined periodic value or the BS may inform the MS through signaling. In addition, the terminal prepares a PUCCH transmission procedure by receiving the PUCCH transmission resource (e.g., RB for transmission of a PUCCH), a cyclic shift value for user multiplexing, etc. from the base station. The signaling may be explicitly signaled from the base station or may be implicitly signaled by a mapping relationship with other control channels from the base station.

In step 404, the UE determines whether the acquired PUCCH transmission format is 'PUCCH transmission format A' or 'PUCCH transmission format B'. If it is 'PUCCH transmission format A', it branches to step 406. If the PUCCH transmission format is B Step 410 is performed.

In case of 'PUCCH transmission format A', in step 406, the terminal generates control information to be transmitted, performs channel coding, and performs a modulation operation. In step 408, the UE maps the modulated signal to the acquired PUCCH resource so as to hop in a frequency band in units of slots according to the 'PUCCH transmission format A'.

In the case of 'PUCCH transmission format B', in step 410, the terminal generates control information to be transmitted, performs channel coding on the control information, and performs a modulation operation. In step 412, the UE maps the modulated signal to the acquired PUCCH resource by frequency hopping in units of subframes according to 'PUCCH transmission format B', and transmits the mapped PUCCH resource.

5 shows a control information reception operation of the base station corresponding to FIG.

In step 502, the BS notifies the UE of a PUCCH transmission format and a PUCCH transmission resource. The PUCCH transmission format is determined in consideration of the amount of control information that the base station desires to receive from the mobile station and the degree of time variation of the channel.

That is, when the amount of control information to be received from the UE is small and the UE transmits the PUCCH for one subframe or the amount of control information to be received from the UE is large, the PUCCH is transmitted during a plurality of subframes At the same time, when it is determined that the channel change is rapid in time, the base station determines the transmission format to be 'PUCCH transmission format A' and informs the terminal.

In addition, when it is determined that the PUCCH is transmitted during a plurality of subframes due to a large amount of control information to be received from the terminal and at the same time it is determined that the channel change is insignificant temporally, the base station determines the transmission format to be 'PUCCH transmission format B' Let me know. At this time, if the rate of change of the channel state is less than a predetermined threshold value, it can be determined that the channel change is insignificant.

Generally, since the transmission time is determined in a predetermined predetermined periodic manner, the CQI information or the MIMO-related feedback information can predict the amount of control information that the base station receives at an arbitrary point in time. Also, the time when the base station receives the ACK / NACK information of the UE indicating whether the data packet transmitted by the base station is erroneous is a time when the base station transmits / receives the transmission / reception processing between the ACK / NACK and the data packet Can be predicted by reflecting. Therefore, the base station can know in advance how much the control information or the combination of the control information is received at a certain point in time. Then, the BS determines whether the temporal change of the channel experienced by the PUCCH is abrupt or not from the data or control channel received from the UE, by referring to the SRS (Sounding Reference Signal) for estimating the uplink channel state, , And is notified from the terminal through separate signaling.

In addition, the base station signals the PUCCH transmission resource (RB for PUCCH transmission), the cyclic shift value for user multiplexing to the UE. The signaling may be explicitly signaled from the base station or may be implicitly signaled by a mapping relationship with other control channels from the base station. In the case of explicit signaling, the RB for PUCCH transmission represents an RB for PUCCH transmission during the first slot period in which the control information is transmitted to reduce the signaling overhead, and information on the RB for PUCCH transmission during the remaining slot period is separately The UE can determine according to the notified PUCCH transmission format, that is, the frequency hopping method.

In step 504, the BS determines whether the transmission format of the control information to be currently received is 'PUCCH transmission format A' or 'PUCCH transmission format B' according to the previously determined PUCCH transmission format. If the transmission format is 'PUCCH transmission format A' And if it is 'PUCCH transmission format B', it branches to step 510 and performs the related procedure below.

In case of 'PUCCH transmission format A', the base station extracts control information to be received based on 'PUCCH transmission format A' in step 506. In step 508, the base station demodulates and decodes the extracted signal, and finally obtains control information.

In case of 'PUCCH transmission format B', the base station extracts control information to be received based on 'PUCCH transmission format B' in step 510. In step 512, the base station demodulates and decodes the extracted signal, and finally obtains control information.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

≪ Embodiment 1 >

In the first embodiment of the present invention, a method for transmitting and receiving control information between a terminal and a base station is proposed in the case where the slot hopping scheme and the subframe hopping scheme are mixed and used for the PUCCH.

The control information includes ACK / NACK feedback information for responding to the successful reception of downlink data transmission, CQI information for feedback of the downlink channel state, feedback information required for MIMO antenna operation, or ACK / NACK, CQI, and combinations of MIMO feedback information. The ACK / NACK information is generally composed of 1-bit data. The ACK / NACK information is repetitively transmitted several times in order to improve reception performance and expand cell coverage. In a system to which MIMO is applied, ACK / NACK information is transmitted for each codeword of MIMO. Generally, the CQI information is composed of a plurality of bits to represent a channel state.

The CQI information includes a wide band CQI representing a channel state for the entire system transmission band and a subband CQI representing a channel state for a subband obtained by dividing a system transmission band by a predetermined small unit . Generally, since the subband CQI includes an indicator indicating which subband is referred to and a channel state value for the corresponding subband, more bits are required to represent the subband CQI than the wideband CQI. The CQI information is channel-coded and transmitted in order to improve reception performance and cell coverage, and a block coding or a convolutional coding scheme is applied.

Generally, a time interval in which the control information is transmitted through the PUCCH is composed of one subframe when the amount of control information to be transmitted is small, and a plurality of subframes when a large amount of control information is transmitted.

6 is a diagram illustrating a control information transmitting apparatus according to the first embodiment of the present invention.

Referring to FIG. 6, the control information generating apparatus 602 receives information on the type and amount of control information from the controller 610 and generates corresponding control information according to a predetermined format for the control information to be transmitted . The channel encoder 604 receives the type and amount of control information to be encoded from the controller 610 and applies a predetermined channel coding method to the signal input from the control information generating apparatus. The channel-encoded signal is generated as a modulation symbol in a modulator 606. The physical channel mapping device 608 maps the generated modulation symbols to the PUCCH, which is a physical channel for transmitting control information, under the control of the controller 610. [ The PUCCH is transmitted using a PUCCH transmission resource allocated from a base station.

Specifically, according to the PUCCH transmission format, the mapping operation is mapped to perform frequency hopping in a slot unit when the PUCCH transmission format is A, and is mapped to perform frequency hopping in a subframe unit when the PUCCH transmission format is B .

The controller 610 controls the mapping operation of the physical channel mapping apparatus 608 by providing the physical channel mapping apparatus 608 with information on 'PUCCH transmission format A' or 'PUCCH transmission format B'. The controller 610 receives information such as the PUCCH transmission resource information, the PUCCH transmission format, and the like, which control information is transmitted from the base station to the control point information generating apparatus 602, the channel encoder 604, and a physical channel mapping device 608, respectively.

7 is a diagram illustrating a control information receiving apparatus according to the first embodiment of the present invention.

Referring to FIG. 7, a receiver extracts a signal mapped to the PUCCH from a received signal in a physical channel demapper 700. The controller 708 applies the PUCCH transmission format information and PUCCH transmission resource information to the physical channel demapper 700 to extract a signal from the PUCCH transmission resource in a slot-based frequency hopping scheme (PUCCH transmission format A) (PUCCH transmission format B) based on a subframe-by-subframe basis and controls the operation of the physical channel demapper 700 to extract a signal.

The channel estimator and compensator 701 performs channel estimation from the pilot symbols of the extracted PUCCH signal and performs channel compensation on the extracted PUCCH signal. The channel estimation and compensation unit 701 receives information on the PUCCH transmission format from the controller 708 and performs channel estimation on a slot basis from the pilot symbols of the extracted PUCCH signal if the PUCCH transmission format is A ' If the transmission format is B ', channel estimation is performed on a sub-frame basis from the pilot symbols of the extracted PUCCH signal, and channel compensation is performed on the extracted PUCCH signal. The channel compensated signal is demodulated by a demodulator 704 and then decoded by a decoder 706 to a channel encoder of a transmitter. The decoder 706 receives decoding related information of a signal to be decoded from the controller 708, such as a decoding method and a coding rate. The receiver obtains control information transmitted from the transmitter from the decoded result.

≪ Embodiment 2 >

The second embodiment of the present invention proposes a method in which a terminal and a base station transmit / receive control information when a frequency hopping method in a slot unit and a frequency hopping method in a slot unit applied with an offset value are mixed and used for the PUCCH .

Hereinafter, the principle of operation according to the second embodiment of the present invention will be described with reference to FIG.

8 illustrates an example of using a frequency band corresponding to one RB at each end of a system transmission band for PUCCH transmission and transmitting a PUCCH over two subframes according to a second embodiment of the present invention . In particular, FIG. 8 shows the operation principle of the frequency hopping scheme in which the offset value is applied in the frequency domain when the control information to be transmitted is transmitted over a plurality of subframes through the PUCCH.

The frequency hopping scheme of the slot unit to which the offset value is applied is characterized in that the position of the frequency domain of the first slot of each subframe is changed by applying a predetermined offset value while maintaining the frequency hopping scheme of the slot unit. Once the position of the frequency domain of the first slot in the subframe is designated by the offset value, the frequency domain position of the second slot in the subframe is shifted from the position of the frequency domain of the first slot to the frequency hopped position Respectively. The offset value is applied only to the odd-numbered subframe among the plurality of subframes in which the control information is transmitted, or only to the even-numbered subframes. The offset value allows a terminal and a base station to commonly recognize the preset value.

That is, in the example of FIG. 8, the UE having allocated the resource i hopes for a frequency hopping in the first subframe and transmits the PUCCH by mapping the reference number 801 and the reference number 804, and transmits the PUCCH in the second subframe, The mapping relationship of the frequency domain is reversed and the PUCCH is mapped to reference numeral 806 and reference numeral 807 and transmitted.

Similarly, the UE having allocated resource j performs frequency hopping on a slot basis in the first subframe and maps PUCCH to reference numeral 802 and reference numeral 803. The offset value is applied in the second subframe, The mapping relationship of the frequency domain is reversed and the PUCCH is mapped to the reference numeral 805 and the reference numeral 808 and transmitted. Through the above operation, the second slot 804 of the first subframe and the first slot 806 of the second subframe that have been allocated resource i occupy the same frequency band, and similarly, The second slot 803 of the second subframe and the first slot 805 of the second subframe occupy the same frequency band. Therefore, when the channel change is insignificant in time, all the pilot symbols from the two slots located in the boundary region of the subframe can be used for channel estimation, and two slots 803 and 805 , 804 and 806) can be improved.

The transmission / reception procedure of the second embodiment is according to the description of FIGS. 4 and 5 of the first embodiment, respectively, and the transmission / reception apparatus of the second embodiment follows the description of FIGS. 6 and 7 of the first embodiment. However, in the second embodiment of the present invention, an operation related to 'PUCCH transmission format B' is replaced with a slot-based frequency hopping operation to which the offset value is applied.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

1 is a diagram showing a transmission structure of a PUCCH in an LTE system;

2 is a diagram illustrating an operation principle of slot-based frequency hopping of a PUCCH according to the prior art;

3 is a diagram illustrating an operation principle of a frequency hopping in subframe units of a PUCCH according to the first embodiment of the present invention;

4 is a diagram illustrating a control information transmission procedure according to the first embodiment of the present invention;

5 is a diagram illustrating a control information reception procedure according to the first embodiment of the present invention;

6 is a diagram showing a transmitting apparatus according to the first embodiment of the present invention

7 is a diagram illustrating a receiving apparatus according to the first embodiment of the present invention;

8 is a diagram illustrating an operation principle of slot-based frequency hopping to which an offset of a PUCCH according to the second embodiment of the present invention is applied

Claims (24)

A method for transmitting control information in a mobile communication system, Obtaining transmission format and transmission resource information for transmission of the control information determined in consideration of the amount of the control information and the rate of change of the channel state from the base station; And transmitting the control information to the base station using a transmission resource matched with the acquired transmission resource information so that frequency hopping is performed in one of a slot period and a subframe period according to the transmission format. 2. The method of claim 1, wherein if the amount of the control information is less than or equal to a first threshold value, or if the amount of the control information is equal to or greater than the first threshold value and the rate of change of the channel state exceeds a second threshold value, Wherein the transmission format is determined so that the frequency hopping is performed. The control method according to claim 1, wherein the transmission format is determined so that frequency hopping is performed in units of subframes when the amount of the control information exceeds a first threshold value and the rate of change of the channel state is equal to or less than a second threshold value Information transmission method. A method for transmitting control information in a mobile communication system, Obtaining transmission format and transmission resource information for transmission of the control information determined in consideration of the amount of the control information and the rate of change of the channel state from the base station; And transmitting the control information to the base station using a transmission resource corresponding to the acquired transmission resource information so that the frequency hopping starts from a frequency position corresponding to a preset offset value to a slot period according to the transmission format Control information transmission method. 5. The method of claim 4, Wherein the offset value is applied only to odd-numbered or even-numbered subframes of a plurality of subframes to which the control information is transmitted. The method according to claim 1 or 4, Wherein the transmission format is set from a predetermined periodic value or a value received through signaling from the base station. A method for receiving control information in a mobile communication system, Selecting a transmission format and a transmission resource for transmission of the control information according to the amount of the control information and the rate of change of the channel state, The method comprising the steps of: receiving a signal transmitted in a slot cycle or a subframe period in a frequency hopping manner according to a transmission format notified to the terminal; And obtaining the control information from the received signal. The method of claim 7, wherein when the amount of the control information is less than or equal to a first threshold value, or when the amount of the control information is equal to or greater than the first threshold value and the rate of change of the channel state exceeds a second threshold value, And the transmission format is selected so that the frequency hopping is performed. 8. The method of claim 7, wherein the transmission format is selected so that the frequency hopping is performed in units of subframes when the amount of the control information exceeds a first threshold value and the rate of change of the channel state is equal to or less than a second threshold value A method for receiving control information. A method for receiving control information in a mobile communication system, Selecting a transmission format and a transmission resource for transmission of the control information according to the amount of the control information and the rate of change of the channel state, Receiving a signal transmitted in a slot cycle starting from a frequency position according to a preset offset value according to a transmission format notified to the terminal; And obtaining the control information from the received signal. 11. The method of claim 10, Wherein the offset value is applied only to odd-numbered or even-numbered subframes of a plurality of subframes to which the control information is transmitted. 11. The method according to claim 7 or 10, Wherein the transmission format is set from a predetermined periodic value or is a value transmitted through signaling to the terminal. A terminal apparatus for transmitting control information in a mobile communication system, A controller for obtaining a predetermined transmission format and transmission resource information for transmission of the control information from the base station; A control information generator for generating control information to be transmitted to the base station under the control of the controller; The generated control information is matched with the acquired transmission resource information so that the control information is frequency hopped in one of a slot period and a sub frame period according to the transmission format determined in consideration of the amount of the control information and the rate of change of the channel state. And a channel mapping device for mapping the resource to a transmission resource. 14. The method of claim 13, wherein if the amount of the control information is less than or equal to a first threshold value, or if the amount of the control information is equal to or greater than the first threshold value and the rate of change of the channel state exceeds a second threshold value, And the transmission format is determined so that the frequency hopping is performed. 14. The method of claim 13, wherein if the amount of the control information exceeds a first threshold value and the rate of change of the channel state is equal to or less than a second threshold value, Device. A terminal apparatus for transmitting control information in a mobile communication system, A controller for obtaining a predetermined transmission format and transmission resource information for transmission of the control information from the base station; A control information generator for generating control information to be transmitted to the base station under the control of the controller; The generated control information is added to the acquired transmission resource information so that frequency hopping starts from a frequency position corresponding to a preset offset value and is a slot period according to the transmission format determined in consideration of the amount of the control information and the rate of change of the channel state And a channel mapping device for mapping the transmitted resource to a corresponding transmission resource. 17. The method of claim 16, Wherein the offset value is applied only to odd-numbered or even-numbered subframes of a plurality of subframes to which the control information is transmitted. 17. The method according to claim 13 or 16, Wherein the transmission format is set from a predetermined periodic value or a value received from the base station through signaling. A base station apparatus for receiving control information in a mobile communication system, A controller for selecting a transmission format and a transmission resource for transmission of the control information according to the amount of the control information and the rate of change of the channel state; A channel demapper for receiving, through the selected transmission resource, a signal transmitted to hop in a frequency of one of a slot period and a subframe period according to the transmission format received from the controller; And a decoder for decoding the transmitted signal to obtain the control information. 20. The apparatus of claim 19, wherein the controller is configured to determine whether the amount of the control information is less than or equal to a first threshold value, or if the amount of the control information is equal to or greater than the first threshold value and the rate of change of the channel state exceeds a second threshold value And selects the transmission format to hop in frequency by the slot. 20. The apparatus of claim 19, wherein the controller selects the transmission format so that the frequency hopping is performed in units of subframes when the amount of the control information exceeds the first threshold value and the rate of change of the channel state is equal to or less than the second threshold value The base station apparatus comprising: A base station apparatus for receiving control information in a mobile communication system, A controller for selecting a transmission format and a transmission resource for transmission of the control information according to the amount of the control information and the rate of change of the channel state; A channel demapper for receiving a signal transmitted through the selected transmission resource from a frequency position according to a preset offset value and shifted in frequency in a slot period according to the transmission format received from the controller, And a decoder for decoding the transmitted signal to obtain the control information. 23. The method of claim 22, Wherein the offset value is applied only to odd-numbered or even-numbered subframes of the plurality of subframes to which the control information is transmitted. The method according to claim 19 or 22, Wherein the transmission format is set from a predetermined periodic value or is a value transmitted through signaling to the terminal.

Images