KR20060080980A - Processing method for reverse packet data control channel - Google Patents

Abstract

The present invention relates to a processing method of a reverse packet data control channel (R-PDCCH), in particular, received in a base station in a mobile communication system.

According to the present invention, one correlation value is selected by using a threshold for each subpacket identifier (SPID) region among correlation values for a reverse packet data control channel (R-PDCCH) frame. By determining the R-PDCCH index by further considering the subpacket identifier information of the frame, it is possible to improve the detection probability of the R-PDCCH according to the retransmission of the R-PDCCH frame from the terminal, thereby improving the reception performance of the R-PDCH frame. It can increase the reverse throughput.

R-PDCH, R-PDCCH, SPID

Description

Processing method for reverse packet data control channel

1 is a block diagram illustrating a reverse packet control channel processing apparatus in a base station according to an exemplary embodiment of the present invention.

2 is a flowchart illustrating a reverse packet control channel processing method in a base station according to an exemplary embodiment of the present invention.

3 is a flowchart illustrating an R-PDCCH index processing method using correlation values for subpacket identifier regions in reverse packet control channel processing according to FIG. 2;

4 is a table showing a mapping table for the R-PDCCH index and information in the 1x EVDV system.

The present invention relates to a processing method of a reverse packet data control channel (R-PDCCH), in particular, received in a base station in a mobile communication system.                         

A typical mobile communication system, for example, a code division multiple access (CDMA) mobile communication system such as IS-2000, only supports voice and low speed circuit and packet data services. As communication technology develops along with user demands, mobile communication systems are developing in the form of supporting high-speed packet data services.

In particular, mobile communication systems such as the International Standard (IS) -2000 1x-EVDV (Evolution in Data and Voice) have received much attention in recent years as supporting high-speed packet data services as well as voice.

At the same time, the development of a mobile communication system capable of supporting both voice service and high speed packet data service in both the forward and reverse directions is being progressed.

Among them, 1x-EVDV REV. In a system such as the D system, in order to improve packet data transmission efficiency, various information about a packet data channel (PDCH) is transmitted through a packet data control channel (PDCCH) in the same time interval. do.

The information of the packet data control channel is essential for demodulating the paired packet data control channel (PDCH), and since an error of the packet data control channel becomes an error of the packet data channel, a method of accurately demodulating the packet data control channel is necessary. Was done.

Here, the control information transmitted on the forward packet data control channel includes a reception address, a transmission rate, a modulation scheme, and the like of the transmission data, which are used for reception of the forward packet data channel.

The control information transmitted on the reverse packet data control channel (R-PDCCH) includes EP size (Encoder Packet Size), SPID (SubPacket ID), Boost Indication, Mobile Status Indicator Bit (MSIB), and the like. This is used to receive the reverse packet data channel (R-PDCH).

Here, the UE can know whether the reverse packet data channel (R-PDCH) frame transmitted to the base station through the forward acknowledgment channel (F-ACKCH) has been successfully received. That is, when a negative acknowledgment (NAK) is received through the F-ACKCH, the R-PDCH is retransmitted and a new packet is transmitted when the ACK (ACKnowledgement) is received.

In this case, when retransmitting, the reverse packet data control channel (R-PDCCH) information has the same encoder packet size (EP_SIZE) and boost indication, and the subpacket identifier (SPID) may be repeatedly transmitted a predetermined number of times according to the transmission order. have.

When the control information of the R-PDCCH is transmitted to the base station in this manner, the base station obtains only the maximum value of the correlation values obtained every frame from the result of the Hardmard transform, and when the detected maximum correlation value exceeds the threshold. The R-PDCCH index is determined directly from the index. The threshold can be obtained by, for example, false alarm possiblity and missing rate.

However, when the base station tries to obtain control information of the R-PDCCH, the following problem occurs when considering only the maximum correlation value of the Hadamard transform result.

If the UE receives an ACK after transmitting twice for a certain R-PDCCH packet and next sends a new R-PDCH packet, the base station should determine SPID 0 for the R-PDCCH of the current frame.

In this case, the terminal sends SPID 0 in the f-8th frame, 1 in the f-4th frame, and transmits SPID 0 in the fth frame. At this time, since the SPID of the f-th R-PDCCH frame is 0, the maximum index idxmax should have one of the index areas where the SPID is 0, i.e., i = 0-30 and i = 33-41.

However, since the base station combines the f th R-PDCCH frame with the f-4 th frame and the f-8 th frame, the index i having the maximum value is the region of the index where SPID is 2, i. Or i = 51 to 59.

When the combined correlation value of the region having SPID 0 is larger than the combined correlation value of the region having SPID 2, an error occurs in the R-PDCCH frame. This phenomenon may occur frequently when the R-PDCCH packet is successfully received only two times, and may increase the R-PDCCH error probability.

A first object of the present invention is to obtain a maximum correlation value for each subpacket identifier region of a reverse packet data control channel after buffering a frame of a reverse packet data control channel, and to calculate one correlation value among the correlation values of a threshold value or more. After the selection, the R-PDCCH index having the correlation value can be determined.

The second object of the present invention is to determine one correlation value after checking whether a previous packet data channel frame has failed or subpacket identifier information of the previous frame when selecting one correlation value from a correlation value greater than or equal to a threshold.

Reverse packet data control channel processing method according to an embodiment of the present invention for achieving the above object,

In the reverse fast packet data (R-PDCH) receiving system,

Extracting a maximum correlation value for each subpacket identifier region of the reverse packet data control channel frame;

Comparing the maximum correlation values with a threshold to detect a correlation value that is greater than or equal to a threshold;

Selecting one of the correlation values above the threshold and determining an index having the selected correlation value as the R-PDCCH index.

In detail, as a result of the comparison, when two or more correlation values are greater than or equal to the threshold value, the index having the largest correlation value among the two correlation values is an R-PDCCH index, unless the correlation value is a correlation value for SPID O and SPID 2. It is characterized by determining.                     

Specifically, if two correlation values equal to or greater than the threshold value are correlation values for SPID 0 and SPID 2, one correlation value is determined after checking whether a previous packet data channel frame has failed and sub packet identifier information of the previous frame. The R-PDCCH index having a correlation value is determined.

Specifically, the previous frame is characterized in that the f-4 th frame when the current frame is f.

Specifically, if two correlation values equal to or greater than the threshold are correlation values for SPID 0 and SPID 2, after checking whether the f-4th packet data channel frame has failed and the SPID value of the previous f-4th frame, the result of the confirmation According to the present invention, the index of SPID 0 or the index of the correlation value of SPID 2 may be determined.

Specifically, if the correlation value for SPID 0 is smaller than the correlation value for SPID 2 and the condition that the previous f-4 th packet data channel frame fails and the previous f-4 th SPID is 1 is satisfied, SPID 2 An index having a correlation value is determined as an R-PDCCH index, and if the condition is not satisfied, an index having a correlation value of SPID 0 is determined as an R-PDCCH index.

Specifically, when the correlation value for the subpacket identifier region exceeds three or more thresholds, the maximum correlation value is obtained from each correlation value, and an index having the maximum correlation value is determined as an R-PDCCH index. do.

Referring to the accompanying drawings, a method for processing a reverse packet data control channel in a base station according to an embodiment of the present invention configured as described above is as follows.

First, a schematic operation for transmitting a reverse packet data control channel (R-PDCCH) from a terminal to a base station is as follows. In the standard (e.g., 1x EVDV REV D system), it is mapped to a 6-bit binary value according to the encoder packet size (EP_SIZE), subpacket identifier (SPID), boost indication (BOOST_INDICATION), and then (6,64) After orthogonal modulation, it is covered with sequence repetition and Walsh code, followed by PN (pseudo noise) and complex multipleplication as quadrature-phase data.

In contrast, the R-PDCCH receiver of the base station is configured as shown in FIG. This corresponds to the reverse process when the R-PDCCH is transmitted. In the receiving process, the frame received in the reverse process is despreaded by the PN (10), decovered with a Walsh code (20), and only quadrature data is selected (30). Since the quadrature phase selector 30 transmits the R-PDCCH data as the data on the quadrature, the receiver discards the in-phase data component and selects only the quadrature data.

Then, perform Sequence De-Repetition (40), perform a Hadamard Transform (50) to find a 6-bit binary value from the obtained 64 symbols, and perform the result frame by frame. Combine 60.

In the 1X EVDV REV.D system, the R-PDCCH includes an encoder packet size (EP_SIZE), a subpacket identifier (SPID), a boost indication (BOOST_INDICATION), and a mobile status indicator bit (MSIB). In order to decode, the encoder packet size and subpacket identifier for the PDCH must be obtained from the R-PDCCH. Here, the MSIB includes information on the power state and data amount of the terminal, and usually has a value of 0 or 1.

In addition, the UE can know whether the R-PDCH frame transmitted through the F-ACKCH was successfully received at the base station. If the base station is not successfully received, the terminal receives the NAK through the F-ACKCH, and successfully transmitted. If so, it will receive an ACK. At this time, the terminal retransmits the R-PDCH when receiving the NAK.

When the R-PDCH is retransmitted, the R-PDCCH information has the same EP_SIZE and BOOST_INDICATION, has a value of 0, 1, 2 according to the SPID order, and can be transmitted up to three times.

That is, one physical encoder packet may be transmitted up to three times. In this case, the encoder packet size and the boost indication of the R-PDCCH are maintained at the same value, and the sub packet identifier is different each time it is retransmitted. Value, with a maximum value of 2. If the SPID is transmitted first by a new packet, SPID 0 is transmitted. In the second transmission, SPID 1 is transmitted after 4 frames. In the third transmission, the SPID is sent again to SPID 2 after 4 frames.

Of these R-PDCCH information, EP_SIZE, SPID, and boost indications are represented by six bits in combination, and these six bits have an index of 0 to 59 and are orthogonally modulated with a Walsh code having a length of 64. The MSIB is then subjected to biorthogonal modulation.

The mapping table for the R-PDCCH index and the information is as shown in FIG. 3.                     

Referring to FIG. 4, the R-PDCCH index is 0 to 59. If the index is 0 to 10, the SPID 0 and the EP_SIZE are 0 to 10. If the index is 11 to 21, the SPID 1 and the EP_SIZE are 0 to 10 and the index 22 32 means SPID 2 and EP_SIZE 0-10. Again, SPID 0 and EP_SIZE are 0 to 8 for indexes 33 to 41, SPID 1 and EP_SIZE for 0 to 8 for indexes 42 to 50, and SPID 2 and EP_SIZE 0 to 8 for indexes 51 to 59. The boost indication has a false value (FALSE = 0) for indexes 0-32 and a true value (TRUE = 1) for indexes 32-59.

For example, when a new R-PDCH packet is sent, the SPID of the R-PDCCH is 0, and if the boost indication is 0, the R-PDCCH index is 0-10, and if the boost indication is 1, the PDCCH index is 33-41. That is, when one correlation value is selected among the correlation values for the SPID of the R-PDCCH, the index having the correlation value is determined as the R-PDCCH index. Thus, EP_SIZE and boost indie mapped to the R-PDCCH index as shown in Table 4 below. You can see the application. Here, the R-PDCCH index is a value used by mapping a 6-bit symbol containing R-PDCCH information (EP_SIZE, SPID, BOOST_INDICATION) into a decimal number for convenience.

The information of the R-PDCCH, the Walsh code mapped when the information is orthogonally modulated, and the TPR (Traffic Pilot Ratio) at that time are shown in Table 1 below.

Index SPID TPR (dB) 0,1 0 -5 2 ~ 4 0 -4 5 ~ 10,33 ~ 34 0 -3 35-37 0 -2 38-41 0 -One 11,12 One -5 13-15 One -4 16-21,42-43 One -3 44-46 One -2 47-50 One -One 22,23 2 -5 24 ~ 26 2 -4 27-32,51,52 2 -3 53-55 2 -2 56-59 2 -One

Such R-PDCCH control information is obtained from a PDCCH index obtained by combining certain R-PDCCH frames.

For such R-PDCCH combine, as a result of the Hadamard transformation, 60 correlation values C _f (i) are taken for the previous 8 frames and buffered. Accordingly, an R-PDCCH index is obtained by combining the R-PDCCH frames, and a threshold (T: Threshold) for detecting the R-PDCCH index is set differently for each TPR and SPID.

That is, the frames that can be combined in any f-th frame are the f-4th frame and the f-8th frame.

The process of combining the above R-PDCCH for each frame is as follows.

을 버퍼링하게 된다. If the 60 correlation values obtained after the Hadamard transform for the f th frame are C _f (i), the previous 4 th and 8 th frames (f-4, f-8) for combining of the R-PDCCH frames Always absolute value of for

Will be buffered.

To obtain the R-PDCCH index for the f-th frame, the combined correlation value C _{c, f} (i) is obtained by applying the following combine algorithm.

For the indexes i = 0 to 10 and i = 33 to 41 having SPID 0, a combine formula such as Equation 1 is applied.

Here, Equation 1 obtains the combined correlation values by taking the absolute values of the correlation values for the SPID 0 region for the current frame f, respectively.

For index i = 11 ~ 21 having SPID 1, a combine formula such as Equation 2 is applied.

For i = 42 ~ 50 of the SPID 1 indexes, a combine formula such as Equation 3 is applied.

Equations (2) and (3) indicate a correlation value [C _f (i)] for the SPID 1 region and a correlation value [C] for the SPID 0 region for the previous f-4 frame to obtain a correlation value for the current frame f. _f-4 (i-9), C _f-4 (i-11)], divided by 1/2, and then summed to obtain the combined correlation values for SPID 0,1.

For i = 22 ~ 32 among the SPID 2 indexes, a combine formula such as Equation 4 is applied.

For i = 51 ~ 59 among the SPID 2 indices, a combine formula such as Equation 5 is applied.

Equations 4 and 5 denote correlation values [C _f (i)] for the SPID 2 region and correlation values for the SPID 1 region for the previous f-4 frame in order to obtain a correlation value for the current frame f. _f-4 (i-9), C _f-4 (i-11)], and the correlation values for the SPID 2 region for the previous f-8 frame [C _f-4 (i-22), C _f-4 (i-18)], each divided by 1/3, and then the combined correlation values for SPID 0, 1, 2 are obtained.

The maximum correlation value and the index corresponding to each subpacket identifier region (SPID 0, SPID 1, SPID 2) are obtained from the correlation values C _{c, f} (i) for the indexes i = 0 to 59 thus obtained.

The maximum value [C _{co, f} ] of the index of the region with subpacket identifier 0 (SPID = 0), that is, the correlation value [C _{c, f} (i)] for i = 0-10 and i = _33-41 The index idx0 _f corresponding to the index i value at the time is obtained by applying Equation 6 from the correlation value C _{c, f} (i).

The maximum value [C _{c1, f} ] of the index of the region where the subpacket identifier is 1 (SPID = 1), that is, the correlation value [C _{c, f} (i)] for i = 11 ~ 21 and i = 42 ~ 50. The index idx1 _f corresponding to the index i value at that time is obtained by applying Equation 7 from the correlation value C _{c, f} (i).

The index of the region where the subpacket identifier is 2, that is, the maximum value [C _{c2, f} ] and the index of the correlation values [C _{c, f} (i)] for i = 22 to 32 and i = 51 to 59 ( i) The index idx2 _f corresponding to the value is obtained by applying Equation 8 from the correlation value C _{c, f} (i).

Here, idx0 _f , idx1 _f , and idx2 _f mean indexes having the largest combined correlation values C _{co, f} , C _{c1, f} , and C _{c2, f} for index regions having SPIDs 0,1,2, respectively.

As such, when the maximum correlation value for each SPID region is determined, if only two specific SPIDs 0 and SPID 2 are detected among the number of correlation values exceeding the threshold among the determined maximum correlation values, the magnitude of the correlation value for the two SPIDs and SPID 0 or SPID 2 are selected depending on whether the previous f-4th frame fails or whether SPID = 1 of the previous f-8th frame. In other cases, if only one correlation value exists, the correlation value should be selected. If two or three correlation values exist, the combined maximum correlation value is selected, and the index having the correlation value is R-. This can be determined by the PDCCH index. This solves an error that occurs when determining a subpacket identifier when receiving a response from the base station after transmitting the second retransmission packet and transmitting a new packet.

In this case, when the R-PDCCH is determined, the MSIB becomes O if the sign of the correlation value [C _f (idxMax)] having the maximum value, which is the result of the Hadamard transformation, is positive, and 1 if it is negative.

Here, if the determined maximum correlation value for each SPID region is less than or equal to the threshold of the index, the R-PDCCH index is not obtained for the f-th frame, which is the current frame, and thus is treated as an R-PDCCH frame error (Error, missing). -Can not decode PDCH frame.

On the other hand, the threshold [T (index)] applied above is a threshold that is applied differently for each index (i), it is applied as a threshold (spid, tpr) differently according to the SPID and TPR (Traffic Pilot Rlgain). The threshold for each index is shown in Table 2 below. This applies the thresholds for 60 indexes to a threshold grouped into 15, combining 3 SPIDs and 5 TPRs.                     

Index T (spid, tpr) 0,1 T (0, -5) 2 ~ 4 T (0, -4) 5 ~ 10,33 ~ 34 T (0, -3) 35-37 T (0, -2) 38-41 T (0, -1) 11,12 T (1, -5) 13-15 T (1, -4) 16-21,42-43 T (1, -3) 44-46 T (1, -2) 47-50 T (1, -1) 22,23 T (2, -5) 24 ~ 26 T (2, -4) 27-32,51,52 T (2, -3) 53-55 T (2, -2) 56-59 T (2, -1)

Specifically, it will be described with reference to FIG. 2 is a flowchart illustrating a reverse packet data control channel processing method according to an embodiment of the present invention.

When the frame is received from the terminal (S21), the correlated absolute value of the received frame is buffered (S22). Here, the buffered correlation value is buffered up to eight frames. That is, to correlate the absolute absolute values of previous frames to accommodate both the maximum number of transmissions (eg 3 times) and the transmission period (eg 4 frames).

At this time, f-8, f-4, f frames are combined to obtain an index of the currently received f th frame (S23). Here, the correlation value of the f-th frame combined with the f-4th frame and the f-8th frame is obtained as Equation 1 to 5 for SPIDs 0, 1, and 2.

A maximum correlation value and an index corresponding to each subpacket identifier are obtained (S24).                     

The number of correlation values exceeding a threshold among the combined correlation values is checked (S25), and the decoding result of the previous frame, for example, the f-4th R-PDCCH frame and f-4 according to the number exceeding the threshold, are determined. One correlation value is determined in consideration of all the SPID (SPID _f-4 ) information for the first R-PDCCH frame, and an R-PDCCH index having the correlation value is determined (S26).

A method of determining the R-PDCCH index will now be described with reference to FIG. 4.

Referring to FIG. 3, the number n of correlation values exceeding a threshold value in the current R-PDCCH frame f is checked (S31). Three correlation values C _{co, f} , C _{c1, f} , If none of the C _{c2, f} exceeds the threshold (n = 0), it is assumed that the PDCCH frame has not been transmitted and no information about the R-PDCCH is determined (S32).

If only one of the three (n = 1) correlation values (C _{ci, f} = C _{c, f} ) exceeds the threshold, then the corresponding index (index = idxi _f ) is the current frame, that is, the f th It becomes the index of the R-PDCCH frame (S33).

If two or more of the three correlation values exceed the threshold (n = 2), the correlation values [C _{co, f} , C _{c2, f} ] for SPDI 0 and SPID 2 are two specific values. It is checked whether the threshold value T has been exceeded (S34).

In this case, when both specific correlation values exceed the threshold, the two correlation values are compared with each other to determine whether the correlation value (C _{c2, f} ) of SPID 2 is greater than the correlation value (C _{co, f} ) of SPID 0. It is made (S35). As a result of checking in S35, when the correlation value for SPID 2 is large, the f-th R-PDCCH frame is considered in consideration of the decoding result of the previous frame, that is, the f-4th R-PDCH frame and the SPID information of the f-4th R-PDCCH. This will determine the index of.

That is, since the correlation values C _{c2 and f} for SPID 2 are large, it is checked whether the f-4th frame is a failure (CRC error or the like) and the SPID is 1 (S36). If the f-4th frame fails and the SPID is 1, the current frame has a high probability that the SPID is 2. Therefore, the maximum correlation value of SPID 2 is selected and the index having the same is selected as the R-PDCCH index (idx2 _f ). (S37).

However, if the correlation value for SPID 0 is greater than the correlation value for SPID 2 or if the f-4th frame is successfully received and the SPID is not 1, then the index with the correlation value for SPID 0 is replaced with the R-PDCCH index ( idx0 _f ) is determined (S38).

On the other hand, if both the correlation value for SPID 0 and the correlation value for SPID 2 does not satisfy the condition larger than the threshold in step S34, the correlation value is determined as the larger value among the correlation values for any two SPIDs (S39). ), The index having the correlation value is determined as the R-PDCCH index. Alternatively, a correlation value for the SPID having the maximum value may be selected from the two (S40).

If three or more (n = 3) SPIDs are larger than a threshold value, a correlation value having a maximum value among three SPIDs is selected (S40), and an index having the maximum value is determined as an R-PDCCH index (S40). S41).                     

In other words, when there are two or more correlation values that are larger than the threshold value, the maximum value is obtained by comparing with other correlation values except when the correlation values for one specific condition, for example, SPID 0 and SPID 2 are both greater than the threshold value. A correlation value having a value is selected, and an index having the correlation value is determined as an R-PDCCH index.

Then, when one correlation value is selected from one or more correlation values and the index of the R-PDCCH frame having the correlation value is determined, the encoder packet size (EP_SIZE) and the boost indicator are determined through the R-PDCCH index mapping table as shown in FIG. 4. (BOOST INDICATION) can be determined, and since the MSIB is determined according to the sign of the finally selected correlation value, the R-PDCH can be decoded using this.

So far, the present invention has been described with reference to the preferred embodiments, and those skilled in the art to which the present invention pertains to the detailed description of the present invention and other forms of embodiments within the essential technical scope of the present invention. Could be implemented. Here, the essential technical scope of the present invention is shown in the claims, and all differences within the equivalent range will be construed as being included in the present invention.

As described above, according to the reverse packet data control channel processing method in the base station according to the present invention, by improving the detection probability of the R-PDCCH, the reception performance of the R-PDCH frame can be improved, and the reverse throughput is increased. It is effective to increase.                     

In addition, the present invention reduces the false alarm or error rate for the received frame, thereby preventing the unnecessary allocation of resources of the modem required for R-PDCH decoding, thereby increasing the efficiency of modem resource utilization.

In addition, the present invention considers the decoding result of the past (previous) PDCH frame and the SPID of the frame of the past PDCCH when determining the SPID of the R-PDCCH, thereby reducing the error about the SPID of the R-PDCCH and reducing the error for the R-PDCCH frame. By reducing, it is possible to increase the probability of success of the R-PDCH frame and to increase the reverse throughput.

Claims (11)

In the reverse fast packet data (R-PDCH) receiving system, Extracting a maximum correlation value for each subpacket identifier region of the reverse packet data control channel frame; Comparing the maximum correlation values with a threshold to detect a correlation value that is greater than or equal to a threshold; Selecting one of the correlation values above the threshold and determining an index having the selected correlation value as an R-PDCCH index. The method of claim 1, As a result of the comparison, when there are two or more correlation values above the threshold, if the correlation value is not a correlation value for SPID O and SPID 2, the index having the largest correlation value among the two correlation values is determined as the R-PDCCH index. Reverse packet data control channel processing method. The method of claim 2, If two correlation values equal to or greater than the threshold value are correlation values for SPID 0 and SPID 2, one correlation value is determined after checking whether the previous packet data channel frame has failed or the sub packet identifier information of the previous frame and determining the correlation value. The method of claim 1, further comprising determining an R-PDCCH index. The method of claim 3, wherein And the previous frame is a f-4th frame when the current frame is f. The method of claim 4, wherein If two correlation values equal to or greater than the threshold value are correlation values for SPID 0 and SPID 2, after checking whether the previous f-4th packet data channel frame failed and the SPID value of the previous f-4th frame, And determining the index of SPID 0 or the index of correlation value of SPID 2.  The method of claim 5, If the correlation value for SPID 0 is smaller than the correlation value for SPID 2 and the condition that the previous f-4 th packet data channel frame fails and the previous f-4 th SPID is 1 is satisfied, the correlation value SPID 2 is obtained. And determining an index having an R-PDCCH index and determining an index having a correlation value of SPID 0 as an R-PDCCH index if the condition is not satisfied. The method of claim 1, If the correlation value for the subpacket identifier region exceeds three or more thresholds, a maximum correlation value is obtained from each correlation value, and an uplink packet characterized by determining an index having the maximum correlation value as an R-PDCCH index. Data control channel processing method. Hadamard codes corresponding to index (i) representing the frame transmission information of the PDCCH channel for the current frame and at least one previously received frame of the packet data control channel (PDCCH) received from the terminal. Obtaining correlations for each frame using the frames; Performing predetermined combining of the correlation values for each frame for each range of the index (i) classified according to a value of a subpacket identifier of the frame transmission information; The index (i) of the current frame of the PDCCH is determined according to a result of comparing the maximum combining values among the combining values of the frame-specific correlation values corresponding to the index (i) for each index (i) range with a predetermined reference value. The reverse packet data control channel processing method comprising the steps of. The method of claim 8, The determining of the index may include determining the index by using the index (i) corresponding to the maximum combining value when the number of the maximum combining values equal to or greater than the reference value is one. Channel processing method. The method of claim 8, The determining of the index may include determining a decoding result of a current previous frame of a packet data channel (PDCH) and a determined subpacket identifier value of a previous frame of the PDCCH when the comparison result has two maximum combining values greater than or equal to the reference value. And determining by using a reverse packet data control channel processing method. In the process of determining the sub packet identifier corresponding to the index (i) representing the information to be transmitted to the current frame by using the correlation values obtained from the received packet data control channel current frame, Hadamard transform, In a specific condition, the subpacket identifier uses the subpacket identifier value of the previous PDCCH frame and the decoding result of the packet data channel (PDCH) frame transmitted in the previous frame to determine the subpacket identifier. Data control channel processing method.

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