KR100421166B1 - Apparatus and method for multiplexing for outer loop power control in w-cdma communication system - Google Patents

Abstract

According to the present invention, if there is no data to be transmitted through a dedicated physical data channel in a code division multiple access mobile communication system and there is no data to be transmitted, a dedicated physical signal is not present if the data to be transmitted does not exist to properly maintain a target signal-to-interference ratio value. When a dedicated physical data channel signal is transmitted through a data channel, a dummy bit generation request signal is generated when there is no data to be transmitted, a dummy bit string is generated by receiving the dummy bit generation request signal, and the dummy bit is generated. The dedicated physical data channel signal having the CRC bit string added to the column is transmitted.

Description

Dedicated physical channel multiplexing device and method for external cyclic power control in asynchronous code division multiple access communication system {APPARATUS AND METHOD FOR MULTIPLEXING FOR OUTER LOOP POWER CONTROL IN W-CDMA COMMUNICATION SYSTEM}

The present invention relates to a code division multiple access mobile communication system, and more particularly, to a dedicated physical channel multiplexing apparatus and method for controlling external cyclic power by appropriately maintaining a target signal-to-interference ratio value.

In general, the channel structure of UMTS (Universal Mobile Terrestrial Syatem), which is a code division multiple access mobile communication system, is largely divided into a physical channel, a transport channel, and a logical channel. The physical channel has a structure of a downlink physical channel and an uplink physical channel according to a data transmission direction. In addition, the forward physical channel is divided into a forward physical common channel (PDSCH) and a forward dedicated physical channel (DPCH), which will be described with reference to FIG. 1.

1 is a diagram illustrating a structure of a forward dedicated physical channel of a mobile communication system.

Referring to FIG. 1, each frame of the forward dedicated physical channel includes 15 slots slots # 0 to slot # 14. Each slot includes a dedicated physical data channel (DPDCH) for transmitting data of a higher layer transmitted from a base station Node B to a user equipment (UE), and a physical layer control signal. It consists of a Dedicated Physical Control Channel (DPCCH) that transmits. The dedicated physical control channel (DPCCH) includes a transport power control (TPC) symbol, a transport format combination indicator (TFCI) symbol, and a pilot for controlling the transmission output of the terminal. It consists of symbols. As shown in FIG. 1, each slot of one frame of the forward dedicated physical channel is composed of 2560 chips. In FIG. 1, the Data 1 symbol and the Data 2 symbol represent data of an upper layer transmitted from a base station to a terminal through a dedicated physical data channel (DPDCH), and a transmission power control symbol is represented by the base station. Represents information for controlling the transmit power of the terminal to the terminal. On the other hand, the transport format combination indication indicates what type of transport format combination (TFC) the forward channel transmitted during one frame (10ms) is currently transmitted. Finally, the pilot symbol is for indicating a criterion for the terminal to control the transmit power of the dedicated physical channel. In this case, the information included in the transport format combination display may be classified into a dynamic part and a semi-static part. The dynamic part includes transport block size (TBS) and transport block set size (TBSS) information. The semi-static part includes a transmission time interval (TTI), a channel coding scheme, a coding rate, and a stay. Information such as static rate matching and cyclic redundancy check (CRC) size may be provided. Accordingly, the transport format combination indication gives a number to the number of transport blocks (TBs) of a channel transmitted during one frame and the transport format combinations that can be used in the respective transport blocks. With reference to the reverse dedicated physical channel structure will be described.

2 is a diagram illustrating a reverse dedicated physical channel structure of a mobile communication system.

Referring to FIG. 2, the reverse dedicated physical channel is composed of 15 slots (slot # 0 to slot # 14) as in the forward dedicated physical channel. The reverse dedicated physical channel includes a reverse dedicated physical data channel (DPDCH) and a reverse dedicated physical control channel (DPCCH). Higher layer data transmitted from the terminal to the base station are transmitted through respective slots constituting one frame of the reverse dedicated physical data channel (DPDCH).

On the other hand, each of the slots constituting a frame of the reverse dedicated physical control channel is a pilot symbol used as a channel estimation signal when the terminal demodulates the data transmitted to the base station, and the transmission of the channels transmitted during the frame currently being transmitted. Transmission format combination symbol indicating whether data is transmitted using a shape combination, a FBI (FeedBack Information) symbol that transmits feedback information when using Tx Diversity, and transmission of a forward channel It consists of a transmit power control symbol for controlling power.

The transmission power of the forward / reverse dedicated physical channel configured as described with reference to FIGS. 1 and 2 may be controlled by a fast power control method such as closed loop power control or outer loop power control. The control of the external circulation power will be described here.

The external cyclic power control method uses a target signal-to-interference ratio (SIR) referred to in the fast power control method for both the forward channel and the reverse channel on a real channel. Compared to the SIR, the threshold of power control is reset based on the comparison result between the target SIR and the actual SIR to perform the closed-circuit power control. In general, in the power control method, a bit error rate (BER) or a block error rate (BLER) is referred to as a "BLER" in order to satisfy the performance required in communication. It is important to keep the BER or BLER in accordance with the required performance by continuously resetting the threshold which causes the external circulation power control method to keep the BER or BLER constant. Role. In addition, the measurement of the BER or the BLER in the terminal or the base station may be measured by detecting an error of the CRC by checking a cyclic redundancy check (CRC) bit included in the received dedicated physical data channel. The forward physical common channel structure will be described.

5 is a diagram illustrating the structure of a forward physical common channel of a mobile communication system. Referring to FIG. 5, one frame of the forward physical common channel includes 15 slots (slot # 0 to slot # 14) with a frame length of 10ms. At this time, since the chip rate of UMTS is 3.84 Mcps, each of the 15 slots becomes 2560 chips.

The forward physical common channel transmits higher layer data from the base station to the terminal in association with the dedicated physical channel for power control and transmission format combination designation. The forward physical common channel is commonly used in time division from a plurality of terminals to efficiently transmit a large amount of packet data to each terminal. In this case, in order for the terminal to use the forward physical common channel, a dedicated dedicated physical channel (DPCH) between the terminal and the base station, that is, a forward dedicated physical channel interworking with the forward physical common channel and a reverse dedicated physical channel Must be maintained. Therefore, in order for a specific terminal to use the forward physical common channel, the forward and reverse dedicated physical channels must be separately configured. For example, if N terminals are using the forward physical common channel, one terminal for each terminal, that is, N forward and reverse dedicated physical channels are set so that each N terminals share the forward physical common channel in time division. will be. On the other hand, the forward physical common channel is a channel that is physically configured to transmit a large amount of packet data, the dedicated physical channel is a degree of transmitting a small amount of control data and retransmission-related data in comparison with the forward physical common channel The physical setting of is made, which will be described in more detail as follows.

The transport format combination indication bit (TFCI _DPCH ) transmitted on the forward dedicated physical channel is information capable of knowing the transport format of the forward physical common channel. Accordingly, the forward transmission format combination indication indicates to which terminal the packet data transmitted through the forward physical common channel is transmitted after a predetermined time at any point in time, and the terminal continuously receives and analyzes the forward dedicated physical channel. As a result, it is possible to know whether there is forward physical common channel data to be received by the terminal itself. Therefore, when the indication of the transmission format combination received by the terminal indicates that data to be received is present on the forward physical common channel of the next frame, the terminal demodulates and receives a signal received through the forward physical common channel in the frame. Decode and receive data transmitted by the base station. As described above, the transmission power is adjusted using external cyclic power control for data transmission on the dedicated physical channel, which will be described by dividing it into normal transmission and gating.

First, in the case of normal transmission, that is, when there is no transmission channel data in the reverse or forward channel during normal data transmission, the CRC bit is transmitted through a dedicated physical channel for external cyclic power control. However, if only the CRC is transmitted when the transmission channel data does not exist, or the external circuit power control is performed by repetition transmission of the CRC, the receiver generates a gain due to combining to generate a target SIR. The value becomes smaller. Therefore, when the transmission channel data is generated again, when the transmission channel data does not exist, only the CRC is transmitted and the target SIR value is already small. Therefore, a problem occurs that the BLER value becomes large until the target SIR value is restored. .

In addition, even when gating is applied in the external cyclic power control, that is, gating of a dedicated physical control channel is used in data communication in which a dedicated channel (DCH) is linked to a downlink shared channel (DSCH). In order to perform external cyclic power control in the meantime, it is necessary to measure BER or BLER through CRC error detection, which will be described in more detail as follows.

First, when the state in which the forward common channel and the dedicated channel are set is referred to as a "DSCH / DCH state", the terminal performing data communication in the DSCH / DCH state maintains an appropriate channel state through power control during the standby time. In order to transmit / receive a forward dedicated channel signal and a reverse dedicated channel signal interworking with the forward common channel. This continuous transmission of the forward and reverse dedicated channel signals to maintain the channel not only causes battery drain of the terminal but also increases the interference of the forward and reverse links, thereby limiting the number of terminals that can use the forward common channel. It becomes the cause.

In order to solve this problem, the UMTS channel structure has a dedicated physical control channel (DPCCH) in the absence of information data (including CRC and tail bits) through a dedicated physical data channel (DPDCH). By selectively reducing the number of slot signals (15 slots / frames) transmitted during every frame (10 ms) through a control channel, dedicated physical control channel gating (DPCCH Gating) is performed to perform efficient wireless channel management. That is, when the dedicated physical control channel is gated, there is no user data transmitted through the dedicated physical data channel, and thus the length of the user data is zero. The start and end of the dedicated physical control channel gating operation may be performed through a control message of a higher layer, that is, a third layer (layer 3), and may also use a transport format combination indication. As described above, according to the gating operation of the dedicated physical control channel, the amount of radio channel resources required to maintain the dedicated physical channel during the period in which user data is not transmitted through the physical channel is reduced, thereby increasing the utilization of radio resources. Reduce battery consumption

Gating of the dedicated physical control channel does not require transmission of data through the dedicated physical data channel without user data (including CRC and tail bits), thereby eliminating the multiplexing process of the forward or reverse dedicated physical data channel. However, in order to perform external cyclic power control even during gating of a dedicated physical control channel, measurement of BER or BLER is required through CRC error detection. Therefore, when gating the dedicated physical control channel, even if there is no user data to be transmitted, the dedicated physical data channel including the CRC should be transmitted.

As described above, when the gating is performed, only the CRC is repeatedly transmitted through the dedicated physical data channel, so that combining occurs at the receiver, thereby lowering the target SIR value. As a result, when the transmission channel data is transmitted after the dedicated physical control channel gating, the target SIR value is reduced due to the dedicated physical control channel gating, and thus the BLER value is increased until the target SIR value is recovered. A problem arises in that cyclic power control cannot be reliably performed.

Specifically, rate matching in a dedicated physical channel multiplexing method, as shown in 3GPP TS (3GPP TS 25.212 V3.4.0: Multiplexing and Channel Coding), is to match the ratio using the following equation (1) .

for all i = 1, ..., I

for all i = 1, ..., I

In Equation 1, N _{i, j} is the number of bits included in one radio frame in the i th transport channel of the transport format combination j before the rate matching method in the reverse direction, and the rate in the forward direction. Intermediate variable used in the matching process, a multiple of 1/8.

N _{data, j} is the total number of bits included in the CCTrCH included in one radio frame of the transport format combination j.

RM _i is the rate matching constant of the i th transport channel.

Z _{i, j} is a rate matching intermediate variable.

Also, In case of reverse direction, it is said as the final target value in rate matching. A positive value indicates the number of bits repeated in one radio frame of the i-th transport channel of the transport format combination j, and a negative value indicates the number of bits punctured. On the other hand, in the forward direction, ΔN _{i, j} is used as an intermediate variable, the value of which is a multiple of 1/8.

I is the number of transport channels included in the CCTrCH.

In the reverse channel, since transmission data is segmented in units of radio frames and then rate matching is performed, it is repeated for each radio frame by Equation 1 using N _{i, j} and N _{data, j} . The rate matching is done by calculating the number of bits ΔN _{i, j} to be punctured and described in 3GPP TS25.212.

On the other hand, in the forward channel, since rate matching is performed before transmission data is segmented into radio frames, that is, in TTI units, rate matching is performed based on N _{i, l} ^TTI _, unlike the reverse channel, and the method is 3GPP. Described in TS25.212. The N _{i, l} ^TTI is a variable used only in the forward direction and is the number of bits included in one TTI when the transmission format l is transmitted in the transport channel i before rate matching. In the case of the forward channel, the positions of the transmission channels in the radio frame may be fixed regardless of the transmission format combination or may vary according to the transmission format combination. In some cases, the intermediate variables N _{i, j} and ΔN used in Equation 1 above may be used. The calculation method of _{i, j} is different, and the rate matching process is also defined differently. For the forward channel, because the N _{data,, j} is not different depending on j, the N _{data,, j} instead of the N _data, from the equation _(1), is marked with a _*.

If the transport channels in the forward channel have a fixed position, N _{i, j} does not depend on j. Therefore, there is as represented by N _{i, *,} N _i, for the _* after calculation as shown in Equation 2, N _{i, *} and N _{data,, *} according to the equation (1) using the ΔN _i, a _* Calculate From the calculated ΔN _{i, *,} a target value of ΔN _{i, l} ^TTI _{, which} is a target value of rate matching _, is obtained in each TTI unit of the transmission channel i of the transmission format l by the process defined in 3GPP TS25.212. The ΔN _{i, l} ^TTI indicates the number of bits to be repeated in each TTI of the transport channel i of the transmission format l when the value is positive, and the number of bits to be punctured when the value is negative.

In Equation 2, F _i is the number of radio frames included in one TTI of transport channel i, and TFS (i) is a set of transport format indexes l for transport channel i.

If the transmission channel on the forward channels having a variable position depending on the transport format combination, N _i, for the _j then calculated as shown in Equation 3, N _{i, j,} and N _{data,, *} the equation (1) using Calculate ΔN _{i, j} accordingly. The calculated ΔN _{i, j} and 3GPP TS25.212 calculate the target value of ΔN _{i, l} ^TTI for each TTI of the transport channel i, which is the transmission format l.

In Equation 3, TF _i (j) is a transport format of transport channel i with respect to transport format combination j.

Accordingly, when channel coding is performed by transmitting only the CRC and / or tail bits necessary for the measurement of the BER or BLER in order to control the external circulation power in the absence of user data, Equations 1, 2, 3, and 3GPP As the rate matching is performed according to the process defined in TS 25.212, the number of bits repeated in the rate matching after channel coding is greater than in the case of transmitting the transmission channel data and the CRC together. Thus, the dedicated physical control channel gating is terminated. When the user data is normally transmitted through the dedicated physical data channel, the target SIR value is set relatively low due to the external cyclic power control performed by transmitting only the CRC, so that the high speed power control does not operate effectively at the initial power control. There is a problem that the situation occurs. This problem occurs in common when external power control is performed by transmitting only a CRC regardless of whether gating is applied.

Accordingly, an object of the present invention is to provide an apparatus and method for multiplexing a dedicated physical channel for performing reliable external cyclic power control in a code division multiple access communication system.

Another object of the present invention is to transmit a dedicated physical data channel according to the gating rate (gating rate) during the gating transmission of the dedicated physical control channel in a code division multiple access communication system to perform a dedicated external channel power control A device and method for multiplexing are provided.

Another object of the present invention is a dedicated physical that can perform outer loop power control (OLPC) according to accurate estimation of signal-to-interference ratio when gating is applied in a code division multiple access communication system. An apparatus and method are provided for channel multiplexing.

Another object of the present invention is to provide a dedicated physical channel multiplexing apparatus and method for performing external cyclic power control by transmitting a dummy bit with a CRC in a code division multiple access communication system.

It is still another object of the present invention to provide a dedicated physical channel multiplexing apparatus and method for performing external cyclic power control by transmitting an appropriate number of dummy bits along with a CRC according to a gating rate in a code division multiple access communication system. Is in.

The apparatus of the present invention for achieving the above objects; In the code division multiple access mobile communication system, if there is no data to be transmitted through a dedicated physical data channel, the dedicated physical data channel is not used if the data to be transmitted does not exist to properly maintain a target signal-to-interference ratio value. An apparatus for transmitting a dedicated physical data channel signal through a controller, comprising: a controller for generating a dummy bit generation request signal when there is no data to be transmitted, and a dummy bit generator for generating a dummy bit sequence when receiving the dummy bit generation request signal And a CRC inserter for adding a corresponding CRC bit string to the dummy bit string, and a channel multiplexer for mapping the first bit string having the CRC bit string added to the dummy bit string to the dedicated physical data channel.

The method of the present invention for achieving the above objects; In the code division multiple access mobile communication system, if there is no data to be transmitted through a dedicated physical data channel, the dedicated physical data channel is not used if the data to be transmitted does not exist to properly maintain a target signal-to-interference ratio value. A method of transmitting a dedicated physical data channel signal through the method comprising: generating a dummy bit generation request signal when the data to be transmitted does not exist, generating a dummy bit string by receiving the dummy bit generation request signal, and And transmitting the dedicated physical data channel signal having the CRC bit string added to the dummy bit string.

1 is a diagram illustrating a structure of a forward dedicated physical channel in a general asynchronous code division multiple access communication system.

2 is a diagram illustrating a structure of a reverse dedicated physical channel in a general asynchronous code division multiple access communication system.

3 is a diagram illustrating a reverse dedicated physical channel multiplexing method for external cyclic power control in an asynchronous code division multiple access communication system to which the present invention is applied.

4 is a diagram illustrating a multiplexing method of a forward dedicated physical channel for external cyclic power control in an asynchronous code division multiple access communication system to which the present invention is applied.

5 is a diagram showing the structure of a forward physical common channel to which the present invention is applied;

6 is a diagram illustrating a multiplexing process in a backward reference channel having a performance of 12.2 kbps.

7 is a diagram illustrating a multiplexing process in an asynchronous code division multiple access communication system according to a first embodiment of the present invention with reference to FIG.

8 is a diagram illustrating a multiplexing process in an asynchronous code division multiple access communication system according to a second embodiment of the present invention with reference to FIG. 6.

9 illustrates a multiplexing procedure in a forward reference channel having a performance of 12.2 kbps.

10 is a diagram illustrating a multiplexing process in an asynchronous code division multiple access communication system according to a first embodiment of the present invention with reference to FIG.

FIG. 11 is a diagram illustrating a multiplexing process in an asynchronous code division multiple access communication system according to a second embodiment of the present invention with reference to FIG.

12 illustrates a dedicated physical channel multiplexing process according to an embodiment of the present invention.

13 illustrates a dedicated physical channel multiplexing device according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

3 is a diagram illustrating a reverse transmission channel multiplexing structure in a code division multiple access communication system. Referring to FIG. 3, a block denoted by reference numeral 301 denotes a structure of generating one reverse transport channel. For convenience of description, the reverse transport channel generation structure 301 is referred to as a "reverse transport channel chain." (chain) ". The block denoted by reference numeral 302 also represents another reverse transport channel generation structure. First, when data to be transmitted is input to the reverse transport channel chain 301, the input data is input to a CRC attachment 303. The CRC inserting unit 303 adds a CRC bit for BLER confirmation to the transmission data and outputs it to the code block concatenation and segmentation unit (TrBk concatenation / Code block segmentation) 304. The code block concatenation and segmentation unit 304 receives the transmission data to which the CRC bit is added, and concatenates or segments the bits in an appropriate code block size to output the channel data to the channel coding unit 305. The channel coding unit 305 inputs a signal output from the code block connection and segmentation unit 304 to channel-code the channel block to have a robust property against channel error, and then, to the radio frame equalization unit 306 in a bit string. Output The radio frame equalizer 306 outputs a bit stream output from the channel coding unit 305 to a first interleaving 307 in units of radio frames (10 ms). The first interleaver 307 inputs the signal output from the radio frame equalizer 306, interleaves the interleaved method in a predetermined interleaving manner, and outputs the interleaved signal to the radio frame segmentation unit 308. Here, the unit of interleaving may be 10ms, 20ms, 40ms, 80ms, and the unit of interleaving may be a transmission time interval (hereinafter, referred to as a "TTI"). When the TTI has a value other than 10 ms, the output of the first interleaver 307 is segmented to 10 ms by the radio frame segmentation unit 308 and then output to the rate matching unit 309. The rate matching unit 309 generates a bit string corresponding to the size of one radio frame by puncturing or repeating the signal output from the radio frame segmentation unit 308, and outputs the same by one transmission channel (TrCH: Transport). CHannel) is created. Accordingly, two reverse transport channels are generated at the outputs of the rate matching units 309 and 310, and more transport channels may be generated when a plurality of reverse transport channel chains are generated. The plurality of TrCHs generated above are input to a TrCH multiplexing 311. The multiplexer 311 multiplexes the plurality of input transport channels to generate one coded composite transport channel (hereinafter, referred to as "CCTrCH") to the physical channel segmentation unit 312. Output The physical channel segmentation unit 312 segments the CCTrCH output from the multiplexer 311 into a size of 10 ms so as to map the CCTrCH to a physical channel, and outputs the segment to a second interleaver 313. . The second interleaver 313 interleaves the signal output from the physical channel segmentation unit 312 with a predetermined interleaving and then outputs the signal to a physical channel mapping unit 314. Here, the unit of the second interleaving is 10ms equal to one radio frame size. That is, the data segmented and interleaved by the physical channel segmentation unit 312 and the second interleaver 313 may ultimately be physical channels (PhCH # 1) 316 and (PhCH # 2) by the physical channel mapping unit 314. 317 is mapped to the output.

Next, a forward transport channel multiplexing structure will be described with reference to FIG. 4. 4 is a diagram illustrating a forward transmission channel multiplexing in a code division multiple access communication system. The forward channel multiplexing process is almost similar to the reverse channel multiplexing process, but as shown in FIG. 4, the rate matching unit 406 is positioned next to the channel coding unit 405. In addition, a first discontinuous transmission indicator insertion unit 407 and / or a second discontinuous transmission indicator insertion unit 412 are added. The block denoted by reference numeral 401 indicates a structure of generating one forward transport channel, and for convenience of description, this block is referred to as a forward transport channel chain, and a block denoted by reference numeral 402 denotes another forward transport channel chain. It will be described, which will be described in detail as follows.

First, when data to be transmitted in the forward direction is input to the forward transmission channel chain 401, the data is output to the CRC inserter 403. The CRC inserter 403 adds the CRC bit for BLER confirmation to the data and outputs it to the code block connection and segmentation unit 404. The code block concatenation and segmentation unit 404 concatenates or segments the signal output from the CRC inserter 403 in a code block size suitable for channel coding and outputs the bit to the channel coding unit 405. The channel coding unit 405 performs channel coding on the signal output from the code block connection and segmentation unit 404 to have a robust property against channel error, and then outputs the signal to the rate matching unit 406. The rate matching unit 406 rate-matches the signal output from the channel coding unit 405 and outputs the first discontinuous indicator insertion unit 407. The first discontinuous transmission indicator inserting unit 407 inputs a signal output from the rate matching unit 406 to insert a DTX indicator indicating which part is not to be transmitted, and then the first interleaver 408. Will output The first interleaver 408 interleaves the signal output from the first discontinuous transmission indicator inserting unit 407 in a predetermined interleaving manner and then outputs the signal to the radio frame segmentation unit 409. Here, the units of the interleaving may be 10ms, 20ms, 40ms, 80ms, and the interleaving unit is a TTI. When the TTI has a value other than 10 ms, the output of the first interleaver 408 is again segmented to fit 10 ms by the radio frame segmentation unit 409. One transport channel is finally generated as the output of the radio frame segmentation unit 409. Similarly, another transport channel is created in the forward transport channel chain 402, and of course, more transport channels can be created if more forward transport channel chains are provided. The generated plurality of transmission channels are input to the multiplexer 411, and the multiplexer 411 outputs the plurality of forward transmission channels to the second discontinuous transmission indicator inserter 412 multiplexed. The second discontinuous transmission indicator inserting unit 412 inserts a second DTX indicator into the signal output from the multiplexer 411 and outputs the second DTX indicator to the physical channel segmentation unit 413. Here, when the second discontinuous transmission indicator is inserted, one CCTrCH is generated as shown in FIG. 4. When one CCTrCH is formed as described above, the CCTrCH is segmented to be mapped to a plurality of 10ms physical channels by the physical channel segmentation unit 413 and input to the second interleaver 414. The second interleaver 414 interleaves the signal output from the physical channel segmentation unit 413 using a predetermined interleaving method and then outputs the signal to the physical channel mapping unit 415. Here, the unit of the second interleaving is 10ms equal to one radio frame size. The data segmented and interleaved by the physical channel segmentation unit 413 and the second interleaver 414 ultimately result in physical channels (PhCH # 1) 416 and (PhCH # 2) ( The mapping to 417 is performed, thereby ending the forward transport channel multiplexing process.

3 and 4 are performed in a transmitter that performs transmission channel multiplexing in the reverse and forward directions, and the description thereof will be omitted since the reverse and forward receivers have a symmetrical configuration of the transmitter. For example, each receiver may use channel decoding instead of channel coding of the transmitter, de-interleaving instead of interleaver, de-multiplexing instead of multiplexer, and discontinuity instead of discontinuous transmission indicator inserter. The transmission indicator extraction unit (removal of DTX indication) is configured to perform a symmetrical operation.

According to the present invention, when only a CRC bit or a tail bit is repeatedly transmitted during a dedicated physical control channel (DPCCH) gating in external cyclic power control, a target signal to interference ratio (SIR) is increased. In order to solve the problem of being set lower than that of normal data transmission, Equation 1 described above is defined in the backward multiplexer 311 so that it can be used for gating of a dedicated physical control channel.

(calendar)

That is, in order to efficiently perform external cyclic power control by keeping the target SIR value constant regardless of the operation of gating, Equation 4 must be satisfied.

In order to satisfy the above Equation 4 and to provide an effective rate matching method for gating, a variable such as N _{i, j} , N _{data, j} shown in Equation 1 described above is newly defined in reverse dedicated physical control channel gating. The usable rate matching equation is expressed by the following equation.

for all i = 1, ..., I

for all i = 1, ..., I

In Equation 5, N _{i, j} ^gating is the number of bits included in one radio frame in the i th transport channel of a transport format combination j before gating at a ^gating rate. Is set to maintain the transmission power of each symbol or bit transmitted before gating is operated and the transmission power of the CRC bit or other bits transmitted for external cyclic power control at the same time or at a similar value. It can be interpreted as the number of bits included in one radio frame. The reason why the transmission power of the symbol or bits before the gating and the transmission power of the CRC bit or the extra bits to be transmitted for the external cyclic power control during the gating are identical or similar is set to the CRC bit or the extra that is transmitted during the gating. Bits This is because the transmission may be repeated excessively in the actual transmission if the transmission is performed without setting. Since the excessive repetitive transmission has a combining effect at the receiver side, resulting in a decrease in the target SIR value in the actual transmission during gating, the data is transmitted through the normal dedicated physical control channel again after the gating is terminated. In external cyclic power control, a power control error may occur due to a decrease in a target SIR value. Also, the In the method of setting the gating rate is 1 / n or It can also be obtained as described above Of course, it can be set in other ways that satisfy the meaning of. remind The second of the two formulas that determine the value of, i.e. The advantage is that the value of the CRC bit or the extra bit set before the channel coding method can always be an integer. Thus, transfer to define a new N _{i, j} ^gating value as the data, but is generated for a dedicated physical data channel, using the dummy (dummy) bit that can be tailored to N _{i, j} ^gating in data length.

In addition, the N _{data, j} ^gating is the total number of bits included in the CCTrCH included in one radio frame of the transport format combination j during ^gating . When the gating rate is 1 / n, it can be obtained as N _{data, j} ^gating = N _{data, j} / n.

RM _i is the rate matching constant of the i th transport channel.

Z _{i, j} ^gating is the rate matching intermediate variable.

In the rate matching used in this gating, the final target value indicates that the positive number indicates the number of bits repeated in one radio frame of the i-th transport channel of the transport format combination j. It indicates the number of bits punched.

I is the number of transport channels included in the CCTrCH.

Meanwhile, in Equation 5, values of two variables N _{i, j} ^gating and N _{data, j} ^gating are divided by the gating rate in the conventional method. That is, when the gating rate is 1 / n Becomes and thus This holds true and as Becomes Therefore, using the results of the above-described equations (1) and (5) This satisfies the condition of Equation 4 above. That is, the change in the target SIR value can be almost ignored regardless of whether gating is used in the dedicated physical control channel.

Next, in the first to fourth embodiments of the present invention, as described above, when the gating of the dedicated physical control channel is performed, the N _{i, j} ^gating value is newly defined so that there is no data to be transmitted but the N _{i, j} ^gating length. Dedicated Physical Data Channels (DPDCHs) are created by using the dummy bits that can be set as data. Therefore, even when performing a gating of the dedicated physical control channel, by transmitting the dummy bit as data, the dedicated physical data channel to which the CRC bit is added is transmitted without excessive CRC repetition, so that an appropriate target SIR value can be maintained, thus effectively controlling external circulation power. Will be possible.

First, a transmission channel multiplexing method used in reverse dedicated physical control channel gating according to the first and second embodiments of the present invention will be described with reference to FIGS. In particular, the first embodiment of the present invention will be described on the assumption that the gating ratio of the dedicated control channel is 1/3.

FIG. 6 illustrates channel coding of a reverse channel having a performance of 12.2 kbps used in a wideband code division multiple access communication system, and FIG. 7 illustrates a modified reverse channel of FIG. 6 according to 1/3 gating of a dedicated physical control channel. 8 shows the reverse channel of FIG. 6 modified according to 1/5 gating of a dedicated physical control channel.

First, channel coding of a dedicated traffic channel (DTCH) (hereinafter, referred to as "DTCH") of the reverse channels, that is, two logical channels, will be described with reference to FIG. 6. In FIG. 6, for convenience of description, the steps in which the DTCH is channel coded will be described in a block form, and the numbers indicated in the blocks are bits processed at the block end. Indicates the number of these. First, when 244 bits of information data are input in block 601, a 16-bit CRC is added in block 603, and an 8-bit tail bit is added in block 605. The CRC and tail bits are added to the information data. In 607 blocks, 1/3 coding (coding rate = 1/3) is performed, resulting in 804 bits. Here, the coding scheme is assumed to be a convolutional coding scheme as an example. The convolutional coded bits are interleaved in block 609 and then segmented into two radio frames having N _{i, j} = 402 in blocks 611 and 613. Each of the two radio frames is rate matched at blocks 615 and 617 to generate 490 bits suitable for the actual physical channel.

On the other hand, when gating is performed, a dummy bit is input to the input information data by determining an appropriate size of the dummy bit string according to the performance based on the radio frame of the 402 bits stored in a predetermined buffer immediately before performing the gating. Therefore, 711 and 713 of FIG. 7 selectively use the above-described equations of the present invention. through Has a value of, through Will have the value of. In this case, since N _{i, j} ^gating is a multiple of 3, which is an inverse of the coding rate, N _{i, j} ^gating has a value of 132 as it is. In addition, N _{data, j} ^gating uses a value of ^600/3 = 200. The channel structure of the case where the third gating used as described above, that is, multiplex structure is as shown in Fig. 7, N _{i, j} multiplied to give as many radio frame TTI as per station from the ^gating, to impart the inverse of the channel encoding rate By subtracting the tail bit and the CRC bit, the length of the actually transmitted information data bit can be obtained. That is, since the TTI is 20ms from N _{i, j} ^gating , which is 132 bits, multiply by 2, and the channel coding ratio is 1/3, so the 8-bit tail bit is divided by 3, which is the inverse of the channel coding ratio 1/3. Subtracting the 16-bit CRC bit makes it 64-bit. The calculation of the length of the data bits is inversely calculated by a controller (not shown), and the information data of the calculated data bit length is formed in 301 and 4 of FIG. 3 to form a transport channel in the forward and reverse directions. Enter 401 to perform a series of actions. Here, since there is no user data actually transmitted during the gating, the 64-bit data of the 701 block uses dummy bits that have no meaning.

Next, when looking at a dedicated control channel (DCCH: hereinafter referred to as "DCCH"), since TTI is 40 ms, N _{i, j} has a value of 90 in block 641 of FIG. Therefore, in operation 741 of FIG. 7, the equations of the present invention described above are used. Will have the value of. In this case, the data bits should be 20 bits long and dummy bits are used as data bits in consideration of a gating situation in which there is no data to be transmitted.

Next, the second embodiment of the present invention will be described on the assumption that the gating ratio of the dedicated physical control channel is 1/5. First, when DTCH is described among two logical channels, when 244 bits of information data (Inforamtion Data) are input in block 601 of FIG. 6, a 16-bit CRC is added in block 603, and a tail bit of 8 bits in block 605. Is added. The block 607 blocks the output to 804 bits. The output value 804 bits are interleaved in block 609 and then divided into two radio frames having size N _{i, j} = 402 in block 611. It can be seen that in block 615 and 617, rate matching is performed on the 402 bit radio frame.

On the other hand, when gating is used, an appropriate dummy bit string size is determined based on the 402 value stored in a predetermined buffer immediately before the gating starts, and the dummy bit is inserted into the input information. Therefore, in blocks 811 and 813 of FIG. 8, the equation of the present invention is used. through Since the number 80 of the bits is not a multiple of the inverse of the coding rate, it has a value of 78, which is a multiple of 3, which is the inverse of the coding rate, and a downward integer value. Another equation of the present invention Using Will have the value of. In this case, since the N _{i, j} ^{gating according} to the second equation of the present invention is a multiple of 3, which is an inverse of the coding rate, the N _{i, j} ^gating has a value of 78 as it is. In addition, N _{data, j} ^gating has a value of ^600/5 = 120. The channel multiplexing structure in the case where 1/5 gating is used as shown in FIG. 8 is obtained by multiplying the number of radio frames per TTI inversely from N _{i, j} ^gating , dividing by the inverse of the channel coding rate, and the tail bit. By subtracting the and CRC bits, the length of data bits to be transmitted can be obtained. In the current method _{, the} ^NTI _{, j} ^gating _, which is 78 bits, inversely multiplies by 2 because the TTI is 20ms, divides by 3 because the channel coding rate is 1/3, and subtracts 8 bits of tail bits and 16 bits of CRC bits, which gives 28 bits. do. The calculation of the length of the data bits is inversely calculated by a controller (not shown) and the information data of the calculated data bit length is input to 301 of FIG. 3 which forms a transport channel in the forward and reverse directions and the serial Perform the specified operation. At this time, since there is no user data transmitted during gating, the 28-bit data uses dummy bits that have no meaning.

Next, when DCCH is described, N _{i, j} has a value of 90 in the block 641 because the TTI is 40 ms. Therefore, in block 841 of FIG. 8, the equation of the present invention is used. Has the value of. In this case, the data bit should be 4 bits long and the dummy bit is used as the data bit in consideration of a gating situation in which there is no data to be transmitted.

The third and fourth embodiments of the present invention will be described with reference to Figs. 9 through 11 for the multiplexing method used in the gating of the forward dedicated physical control channel provided by the present invention.

In the case of the forward channel, as mentioned in the description of the prior art, rate matching is performed based on N _{i, l} ^TTI according to 3GPP TS 25.212, since rate matching is performed in units of TTIs. Therefore, even in the reverse channel, as suggested by the present invention, N _{i, l} ^{TTI, gating} in the forward channel is defined and used for rate matching instead of N _{i, l} ^TTI . The N _{i, l} ^{TTI, gating} is the size of the transmit power of each symbol or bit transmitted before ^gating is performed on the forward channel and the transmit power of the CRC bit or other bits transmitted for external cyclic power control during gating. It can be interpreted as the number of bits included in one TTI of a transport channel i whose transport format is set to maintain the same or similar value. The reason why the transmission power of the symbol or bits before the gating and the transmission power of the CRC bit or the extra bits transmitted for the external cyclic power control during the gating are the same or similar is that the CRC bits or the extra bits transmitted during the gating This is because if it is transmitted without setting N _{i, l} ^{TTI, gating} , it may be excessively repeated in actual transmission. The excessive repetitive transmission reduces the target SIR value in the actual transmission during gating, and reducing the target SIR value can cause an error in external cyclic power control after gating. In the method for setting the N _{i, l} ^{TTI, gating} , the gating rate is 1 / n and the channel coding rate is R or It may be obtained by the above method, and may be set by any other method that satisfies the meaning of N _{i, l} ^{TTI and gating} described above. A second formula, i.e., two formulas for determining the value of N _{i, l} ^{TTI, gating} The advantage is that the value of the CRC bit or the extra bit set before the channel coding method can always be an integer. As above, there is no user data to be transmitted when gating by newly defining N _{i, l} ^{TTI, gating} value, but using dummy bit that can adjust N _{i, l} ^{TTI, gating} length as data without repeating CRC. You will create a physical data channel.

The N _{i, l} ^TTI, using N _{i, l} ^TTI instead of Equation 2 or Equation 3 ^gating if a fixed position of the transport channel, regardless of transport format combination, by the equation (2) N _{i , * Is} calculated, and when the position of the transport channel is variable, N _{i, j} is calculated by Equation 3 above. Forward rate matching is performed by using the method defined in Equation 5 and 3GPP TS 25.212 using N _{i, *} or N _{i, j} . However, when N _{i, *} is used in the rate matching process, N _{i, *} is substituted for N _{i, j} in Equation 5 above. In the process of performing the forward rate matching as described above, since the total number of bits of the CCTrCH per radio frame is irrelevant to the transmission format combination j, N _{data, *} ^gating is used instead of N _{data, j} ^gating of Equation 5. N _{data, *} ^gating is the total number of bits of the CCTrCH that fit into one radio frame at the time of gating. N _{data, *} ^gating is when gating rate is 1 / n You can get it by Where P is the number of transport channels in one radio frame.

As described above _, when gating a dedicated physical control channel is performed, a data bit is defined by newly defining N _{i, l} ^{TTI, gating} value, but a dummy bit for ^{adjusting the} length of N _{i, l} ^{TTI, gating} is provided. It is used as data to create a dedicated physical data channel. Through this operation, the dedicated physical data channel with the CRC added is transmitted without excessive duplication even when performing the gating of the dedicated physical control channel, thereby finding a reliable target SIR value, thereby enabling effective external circulation power control. will be.

9 is a structure of a forward reference channel having a performance of 12.2 kbps used in a WCDMA system, and FIG. 10 shows how the reference channel of FIG. 9 is changed when 1/3 gating is used for the dedicated physical control channel. It is a structural diagram. First, when a dedicated traffic channel (“DTCH”) of the two logical channels is viewed, when 244 bits of information data (Inforamtion Data) are input in step 901 in FIG. 9, a CRC of 16 bits is added in step 903. In step 905, an 8 bit tail bit is added. In operation 907, the N _{i, l} ^TTI has a value of 804 and the N _{data, *} has a size of 420 by the channel encoding unit.

Therefore, in block 1007 of FIG. If you use the formula Can be obtained as N _{data, *} ^gating = 420/3 = 140, so the output of the rate matching section 1009 becomes 228 bits. As described above, in the case where 1/3 gating is used, the forward channel multiplexing structure is as shown in FIG. 10, and therefore, the length of the data bits should be 65 bits. Calculation of the length of the data bit is inversely calculated by a controller (not shown), and inputs information data of the calculated data bit length to 301 of FIG. 3 and 401 of FIG. 4 to perform an operation. Since there is no data to be transmitted during gating, the 65-bit data uses dummy bits that are meaningless. An example of the available dummy bits may use '0' or DTX bits.

Next, referring to the Dedicated Control Channel (“DCCH”), N _{i, l} ^TTI has a value of 360 at the output of the block 937 of FIG. 9. Therefore, the number of output bits of the 1037 block of FIG. Will have the value of. In this case, the data bit should be 20 bits long and the dummy bit is used as the data bit in consideration of a gating situation in which there is no data to be transmitted. In step 1039, the output of the rate matcher becomes 104 bits. Accordingly, the channel multiplexing structure when gating is used as described above is as shown in FIG. The length of the data bit is calculated inversely by a controller (not shown), and the information data of the calculated data bit length is input to 301 of FIG. 3 and 401 of FIG. 4 to perform an operation.

In the fourth embodiment of the present invention, the gating of the dedicated physical control channel will be described with the case that the gating ratio is 1/5. FIG. 11 is a structural diagram showing how the reference channel of FIG. 9 is changed when gating of a dedicated physical control channel is used when a structure of a forward reference channel having a performance of 12.2 kbps is used. Traffic CHannel (hereinafter referred to as "DTCH"), when 244-bit information data (Inforamtion Data) is input in block 901 of FIG. 9, a 16-bit CRC is added in step 903, and 8-bit tail bits are added in block 905. . In block 907 _, N _{i, l} ^TTI has a value of 804 and N _{data, *} has a size of 420 _, by the channel encoding unit.

Therefore, the number of output bits of the block 1107 of FIG. Calculated using the formula, And N _{data, *} = 420/5 = 84. Accordingly, 136 bits are output from the rate matcher in block 1109. The channel multiplexing structure in the case where gating is used as described above is as shown in FIG. 11, and therefore, the length of the data bit should be 29 bits. The calculation of the length of the data bit is calculated inversely by a controller (not shown), and the information data of the calculated data bit length is input to 301 of FIG. 3 and 401 of FIG. 4 to perform an operation. At this time, since there is no data to be transmitted during gating, the 29-bit data uses dummy bits that have no meaning. As an example of the available dummy bits, '0' or DTX bits may be used.

Next, in the DCCH, N _{i, l} ^TTI has a value of 360 in the 1037 block of FIG. Therefore, in block 1137 of FIG. Using the equation, the number of output bits in the 1137 block has a value of 72. In this case, the data bit should be 4 bits long and the dummy bit is used as the data bit in consideration of a gating situation in which there is no data to be transmitted. Therefore, 64 bits are output from the rate matcher of 1139 blocks. The channel multiplexing structure in the case of using gating as described above is as shown in Fig. 11, and the calculation of the length of the data bits is calculated inversely by a controller (not shown), and the information data of the calculated data bit length The operation is performed by inputting 301 of FIG. 3 and 401 of FIG. 4.

Meanwhile, the fifth embodiment of the present invention provides an apparatus and method for transmitting data through a dedicated physical data channel when there is no transmission channel data to be actually transmitted in a reverse channel or a forward channel, but a dedicated physical channel must be transmitted for external circulation power control. Explain. In the fifth embodiment of the present invention, CRC bits and dummy bits are transmitted through the dedicated physical data channel to control the target SIR value for the external cyclic power control properly. This will be described with reference to 13.

12 illustrates a dedicated physical channel multiplexing process according to an embodiment of the present invention. Referring to FIG. 12, when it is determined that there is no transmission channel data anymore while transmitting transmission channel data and CRC bits through a dedicated physical data channel (step 1201) (step 1203), appropriate external cyclic power control is performed. Since there is no transport channel data to be transmitted for the transmission, the dummy bit and the CRC bit are transmitted together instead of the transport channel data (step 1205). If there is no transmission channel data to be transmitted through the dedicated physical data channel, and the transmission channel data to be transmitted is generated (step 1207), the base station again generates the transmission channel data and the CRC bit and then creates the dedicated physical data channel. In step 1201. The dummy bit value may have a value of '1' or '0'.

Meanwhile, the amount of dummy bits transmitted when there is no transmission channel data may vary depending on how to maintain a target SIR value of the external cyclic power control when there is no transmission channel data. For example, the transmission channel data is finally transmitted. If the same target SIR value is to be maintained, the same amount of dummy bits as the last transmitted channel data should be transmitted. By transmitting the same amount of dummy bits as the last transmitted channel data, it is possible to maintain the same target SIR value as when there is no transport channel data transmitted through the actual dedicated physical data channel but the transport channel data exists. .

As an example, as shown in FIG. 6, if 244 bits of transmission channel data are transmitted every 20ms TTI through DTCH and 100 bits of transmission channel data are transmitted every 40ms TTI through DCCH, the actual transmission is performed. The number of dummy bits transmitted when there is no channel data is required to transmit 244 bits every 20ms TTI with DTCH and 100 bits every 40ms TTI with DCCH, so that the same external cyclic power control as in the case of actual transmission channel data exists. On the contrary, although there is no transmission channel data to be actually transmitted, the number of dummy bits to be transmitted together with the CRC bit may be preset to a predetermined value when the CRC bit is transmitted for external circulation power control. In this case, if gating is performed, the number of dummy bits should be set in consideration of the gating ratio.

12 illustrates a process of generating a CRC bit and a dummy bit for external cyclic power control when a dedicated physical channel is maintained for external cyclic power control although no actual transmission channel data exists. A CRC bit and a dummy bit generation device for cyclic power control will be described.

FIG. 13 illustrates a dedicated physical channel multiplexing apparatus according to an embodiment of the present invention. When transmission channel data does not exist, FIG. 13 illustrates a dummy bit and a CRC bit for external cyclic power control as described with reference to FIG. A diagram illustrating an apparatus for transmitting.

First, the controller 1307 determines whether there is transport channel data to be transmitted any more while the transport channel data and the CRC bit are being transmitted. Here, whether the transport channel data exists is whether the controller 1307 determines whether there is information data bits 1305 flowing into the controller 1307 itself, and as a result of the determination, the controller If it is determined that there is an information data bit 1305 input thereto, the input information data bit 1305 is output to a CRC attachment 1311 as in a general dedicated physical channel multiplexing process. Then, the CRC inserter 1311 inserts the corresponding CRC bit into the information data bit 1305 output from the controller 1307, and then the channel multiplexer chains the information data bit 1305 and the inserted CRC bit. (1313). Then, the channel multiplexer 1313 inputs the signal output from the CRC inserter 1311 to perform a series of other channel multiplexing processes, that is, a series of channel multiplexing processes such as channel coding, interleaving, radio frame division, rate matching, and the like. Perform these steps to generate and output the transport channel data.

On the other hand, if the controller 1307 determines that there is no more information data bit 1305 to be transmitted, the transmission channel data to be transmitted does not exist but the information is maintained in order to maintain a dedicated physical channel for external cyclic power control. Dummy bits are generated to replace the data bits 1305. In other words, when the controller 1307 determines that there is no information data bit 1305 to be transmitted, the controller 1307 uses a dummy bit generator 1301 to generate a dummy bit request signal 1309. ). The dummy bit generator 1301 generates a dummy bit to replace the information data bit 1305 as the dummy bit generation request signal 1309 is received from the controller 1307. Here, the dummy bit has a value of '0' or '1', and the number of dummy bits generated by the dummy bit generator 1301 is controlled by the controller 1307. That is, the controller 1307 determines the pattern and the length of the dummy bit string 1303 generated by the dummy bit generator 1301. 12, the length of the dummy bit string 1303 is generated as the number of bits of the transport channel data last transmitted before the dummy bit is transmitted or the length preset in the system. In this case, the number of data bits of a transport channel that is transmitted before the dummy bits is transmitted refers to the number of data bits of a transport channel transmitted when there is transport channel data in general dedicated physical channel transmission. In the case where transport channel data continuously exists and there is no transport channel data to be transmitted, a dummy bit string is generated using the number of transport channel data bits previously transmitted.

The dummy bit generator 1301 outputs the generated dummy bit string 1303 to the CRC inserter 1311, and the CRC inserter 1311 outputs the dummy bit string 1301 from the dummy bit generator 1301. After inserting the corresponding CRC bit in 1303, the dummy bit string 1303 and the inserted CRC bit are output to the channel multiplexer 1313. Then, the channel multiplexer 1313 inputs the signal output from the CRC inserter 1311 to perform a series of other channel multiplexing processes, that is, a series of channel multiplexing processes such as channel coding, interleaving, radio frame division, rate matching, and the like. It generates and outputs the transmission channel data through them.

As described with reference to FIGS. 12 and 13, when the dedicated physical channel for external cyclic power control is maintained while the actual transport channel data does not exist, the same bit string as when the actual transport channel data is transmitted using the CRC and dummy bits. By controlling the transmission to eliminate the case that the target SIR value is lowered during the external cyclic power control, it is possible to maintain a constant external cyclic power control gain.

On the other hand, another device provided by the present invention is a second interleaver. The second interleaver is located immediately in front of the physical channel mapping as shown in the reverse channel multiplexing structure of FIG. 3, and similarly in the forward channel multiplexing structure of FIG. 4. The general second interleaver has the performance of a block interleaver and operates as follows.

Input bits of the second interleaver It is defined as. Where p is the number of physical channels and U is the length of all bits contained in one physical channel. The second interleaver has a fixed column length C2 (set to 30) and defines a matrix having a row length R2 that is variable according to the data. Where R2 is It must be the minimum integer that satisfies the equation. The input bit Is input along a row as an R2 × C2 matrix to generate a matrix as shown in Equation 6 below.

In the matrix shown in Equation 6, y _{p, k} = u _{p, k} to be. If U <R2 x C2, a dummy bit is added to satisfy R2 x C2 = U. The matrix shown in Equation 6 is subjected to hot substitution using Table 1 below.

Number of columns (C2) Hot substitution type <P2 (0), P2 (1), ..., P2 (C2-1)> 30 <0,20,10,5,15,25,3,13,23,8,18,28,1,11,21,6,16,26,4,14,24,9,19,29,12 , 2,7,22,27,17>

In other words, the columns of the matrix are rearranged as in the column substitution form of Table 1, and the 0th column is arranged in the 0th column, the 20th column in the 1st column, the 10th column in the 2nd column, and so on. A matrix such as the following Equation 7 is created.

The output of the second interleaver, that is, the block interleaver Output bits along the line as The output bit corresponding to the dummy bit added in the second interleaver is deleted. As a result, the operation of the second interleaver is terminated, and the output of the second interleaver is input to the physical channel mapping unit 314 described with reference to FIG. 3 or the physical channel mapping unit 415 described with reference to FIG. .

On the other hand, when gating of the dedicated physical control channel is used, the operation of the second interleaver is changed. That is, the input of the second interleaver is smaller by a gating rate than when gating is not used, and the output of the second interleaver is also gated and transmitted only to the selected slot. The present invention provides a modified second interleaver that can be applied when using gating of a dedicated physical control channel, the interleaving method of which is described below.

Gating rate Slots for backward dedicated physical control channels Pilot, TFCI, FBI, TPC One All slots (0,1, ..., 14) 1/3 1/5

Table 2 shows slots through which forward dedicated physical control channels are transmitted according to gating rates, and Table 3 shows slots through which reverse dedicated physical control channels are transmitted according to gating rates. In Table 2, DRX Cycle means an interval for receiving the entire reverse dedicated physical control channel signal without performing gating while gating the reverse dedicated physical control channel according to the gating rate.

In Equation 8, N is the inverse of the gating rate and is defined as S = 15 / N, A _j is defined as shown in Equation 9, i is the number of CFN, C _i is i + 256 * i Has the value of.

When gating of a dedicated physical control channel is used, the shape of a slot transmitted in one radio frame having a length of 10 ms is determined using Equation 8 and Tables 2 and 3 above. That is, in Equation 8, the transmission slots of the pilot, TPC, and TFCI bits in the forward direction can be found using Table 2 according to the value of s (i, j), and the transmission of all bits in the reverse direction using Table 3 Find the slot. Dedicated physical data channels for external cyclic power control are transmitted in slots such as TPC in the forward direction and slots such as Pilot, TPC, FBI, and TFCI in the reverse direction.

Therefore, the operation of the second interleaver should be performed differently from the conventional case, that is, when the gating of the dedicated physical control channel is not used to fit the transmission slot type described above. The operation of the second interleaver that can be used when using the gating of the dedicated physical control channel according to the sixth and seventh embodiments of the present invention will be described.

First, the sixth embodiment of the present invention describes an operation in which data to be transmitted by the second interleaver is mapped to only a few slots selected according to a gating rate among 15 slots in one radio frame in a system in which gating is used. do.

When gating is used, the input of the second interleaver is reduced by a gating ratio as compared to the case where gating is not used. Therefore, in order to maintain the size of the matrix shown in Equation 6, addition of dummy bits is necessary. In the addition of the dummy bits, in order to map the physical channel using the matrix of the second interleaver applied when the gating is not used as it is, the slot type of gating defined in Table 2, Table 3 and Equation 8 above is used. The input of the second interleaver should be adjusted so that the interleaved signal is mapped accordingly. That is, when the slot number currently being gated and transmitted is determined, columns corresponding to the slot transmitted in Equation 7 are determined accordingly, and again, meaningful meanings to be transmitted in data before performing hot substitution in Equation 6 are given. The heat is determined. In the second interleaving, the meaning of reverse interleaving is used. In this case, the input of the second interleaver is input to only the column having the meaning of Equation 6, and the dummy bit is input to the remaining meaningless column. Therefore, when the output after the second interleaving is mapped to the physical channel in the same manner as the conventional method, meaningful data is mapped only to the slot transmitted through the gating.

For example, assuming a situation in which gating with a gating rate of 1/3 is used and a current CFN = 0, S = 5 and N = 3. Therefore, according to Equation 6, since s (0, j) becomes {1,1,0,2,2}, slots transmitted on the forward channel are slot numbers 1, 4, 6, and 11 as shown in Table 2 as a result. TPC, TFCI, and dedicated physical data channels are transmitted to the slot with 14, and the pilot is transmitted to the slot with slot numbers 0, 3, 5, 10, and 13. In order for the dedicated physical data channel to be transmitted to the 1, 4, 6, 11, and 14 slots, the output of the second interleaver is the 2nd, 3rd, 8th, 9th, 12th, 13th columns, Meaningful data, that is, bits inputted to the second interleaver, must exist only in the 22nd, 23rd, and 28th, 29th columns, and thus, 1, 5, 8, There should only be meaningful data in columns 9, 10, 11, 17, 23, 27, and 29.

In addition, although the input of the second interleaver shown in 414 of FIG. 4 is input along a row to the matrix of Equation 6, the above-mentioned 1, 5, 8, 9, 10, 11, 17, 23, 27, Data is contained only in column 29, and dummy bits are added to the remaining positions. When input to the second interleaver through the above operation, the second interleaver makes a matrix shown in Equation 7 through the inter-substitution of Table 1, and has a total of 15 slots in two slots along the columns of the matrix. Will be mapped. Meaningful data are eventually mapped to slots having slot numbers 1, 4, 6, 11 and 14 so that transmission in a gating situation is performed properly.

Embodiment 7 describes another example of a second interleaver that operates so that data to be transmitted in a system in which gating is used is mapped to only a few slots selected according to a gating rate among 15 slots in one radio frame. When gating is used, the input of the second interleaver is reduced by the gating rate as compared to the case where gating is not used. Therefore, if the matrix shown in Equation 6 is set to the same number of columns as before, the number of columns is also reduced according to the gating rate. That is, after inputting the input bits along the rows using the existing method as it is, and inserting the dummy bits for filling the last row after the input, the output matrix shown in Equation 7 is performed immediately after performing the column substitution of Table 1. You can make Again, the number of rows decreases with the gating rate compared to the output matrix without traditional gating. If the element values of this matrix are read along the row and mapped only to slots transmitted by gating, mapping of all bits input to the second interleaver into slots transmitted through gating is performed without input of other dummy bits. Thus, effective interleaving is performed.

For example, assuming that a gating rate of 1/3 gating rate is used and a current CFN = 0, S = 5 and N = 3. According to Equation 6, s (0, j) becomes {1,1,0,2,2}. Therefore, slots transmitted on the forward channel have slot numbers 1, 4, 6, 11, and 14 as shown in Table 2. The TPC, TFCI, and dedicated physical data channels are transmitted to the slot having the slot, and the pilot is transmitted to the slot having slot numbers 0, 3, 5, 10, and 13. If gating is not used, the matrix of Equation 6 above in the second interleaving is C2 = 30. If it is a 60 * 30 matrix having a value of R2 = 60, and the addition of dummy bits is not necessary, the output matrix of Equation 7 also has a size of 60 * 30 and maps two columns to one slot along the column. do. That is, the size of one slot is 120 bits. In this case, if 1/3 gating is used, the matrix of Equation 6 becomes a matrix having a size of 20 * 30. In other words, the size of the row is reduced by 1/3, the gating rate. The matrix of Equation 7 obtained through the thermal substitution of Table 1 also has a size of 20 * 30. In this case, if you map to five slots out of a total of 15 slots along a column, you will have six columns mapped to one slot. That is, 120 bits of 20 * 6 are mapped to one slot so that the same gating is used when the gating is not used.

Example 8 provides new interleaving when gating is used. In conventional interleaving, the C2 values of Equations 4 and 5 are divided by the gating rate. That is, for 1/3 gating, the C2 value is 10, and for 1/5 gating, the C2 value is 6. In the case of the above embodiment, the matrixes of Equations 6 and 7 are reduced only in rows, and columns are the same as those without using gating. However, the hot substitution type shown in Table 1 must be newly specified. For hot substitution, one-tenth gating mixes ten rows and one-fifth gating mixes six rows. As one example, a method such as Tables 4 and 5 may be used.

Number of columns (C2) Hot substitution type <P2 (0), P2 (1), ..., P2 (C2-1)> 10 <0,5,3,8,1,6,4,9,2,7>

Number of columns (C2) Hot substitution type <P2 (0), P2 (1), ..., P2 (C2-1)> 6 <0,5,3,1,4,2>

As a result, in the matrix of Equation 7, which is the output of interleaving, the second interleaving is effectively performed by mapping data in two columns into one slot according to the columns regardless of the gating rate.

As described above, when there is no transmission channel data in the reverse or forward channel in a code division multiple access mobile communication system, when the CRC bit is transmitted for external cyclic power control, the dummy bit and the CRC bit are combined to maintain the target SIR value appropriately. By transmitting, there is an advantage that reliable external circulation power control can be performed.

In addition, the present invention continuously transmit channel data even in the normal transmission of the dedicated physical channel when there is no temporary, that is, if the actual transmission channel data does not exist but maintain a dedicated physical channel for external cyclic power control By transmitting the dummy bit string equal to the number of transmission channel data just before the transmission channel data does not exist, or by transmitting a dummy bit string preset in the system, a target SIR decrease is prevented during the external cyclic power control. Has an advantage. Thus, the external cyclic power control gain is properly maintained, and thus the external cyclic power control can be continuously maintained even when the transmission channel data is generated again.

In addition, since the transmitting side transmits the dedicated physical control channel according to the gating rate when transmitting the dedicated physical control channel according to the gating rate, the receiving side can receive the dedicated physical data channel even during the gating transmission, thereby enabling accurate external circulation power control. There is an advantage to that.

Claims (23)

delete delete In the code division multiple access mobile communication system, if there is no data to be transmitted through a dedicated physical data channel, the dedicated physical data channel is not used if the data to be transmitted does not exist to properly maintain a target signal-to-interference ratio value. An apparatus for transmitting a dedicated physical data channel signal through A controller for generating a dummy bit generation request signal when there is no data to transmit; A dummy bit generator configured to generate a dummy bit string upon receiving the dummy bit generation request signal; A CRC inserter for adding a corresponding CRC bit string to the dummy bit string; And a channel multiplexer for mapping the first bit string having the CRC bit string added to the dummy bit string to the dedicated physical data channel. delete delete delete In the code division multiple access mobile communication system, if there is no data to be transmitted through a dedicated physical data channel, the dedicated physical data channel is not used if the data to be transmitted does not exist to properly maintain a target signal-to-interference ratio value. In the method for transmitting a dedicated physical data channel signal through, Generating a dummy bit generation request signal when there is no data to transmit; And transmitting the dedicated physical data channel signal in which a dummy bit string is generated by receiving the dummy bit generation request signal and a CRC bit string is added to the dummy bit string. The method of claim 7, wherein The dummy bit string has a number of bits having the same size as the number of data bits transmitted through the dedicated physical data channel when the data to be transmitted exist. The method of claim 7, wherein The dummy bit string is generated to have a predetermined number of bits. In the code division multiple access mobile communication system, if there is no data to be transmitted through a dedicated physical data channel, the dedicated physical data channel is not used if the data to be transmitted does not exist to properly maintain a target signal-to-interference ratio value. In the method for transmitting a dedicated physical data channel signal through, Generating a dummy bit generation request signal when there is no data to transmit; The first bit string is generated by receiving the dummy bit generation request signal and adds a CRC bit string to the dummy bit string, and at least one dedicated physical data channel different from the dedicated physical data channel. Generating a matrix by sequentially inputting dedicated physical data channel signals to be transmitted in a row form; And performing interleaving on the matrix to interleave the bits corresponding to the dummy bit stream to interleave the signals, and mapping and transmitting them to a dedicated physical channel signal. The method of claim 10, The dummy bit string has a number of bits having a size equal to the number of data bits transmitted through the dedicated physical data channel when the data to be transmitted exist. The method of claim 10, The dummy bit string is generated to have a predetermined number of bits. delete delete delete In the code division multiple access mobile communication system, if there is no data to be transmitted through a dedicated physical data channel, the dedicated physical data channel is not used if the data to be transmitted does not exist to properly maintain a target signal-to-interference ratio value. An apparatus for transmitting a dedicated physical data channel signal through A controller for generating a dummy bit generation request signal when there is no data to transmit; A dummy bit generator configured to generate a dummy bit string upon receiving the dummy bit generation request signal; A CRC inserter for adding a corresponding CRC bit string to the dummy bit string; The first bit string having the CRC bit string added to the dummy bit string is sequentially input to another dedicated physical data channel signal in a row form to generate a matrix, and column substitution is performed on the matrix to correspond to the dummy bit string. And a channel multiplexer for outputting the bits to be deleted and mapping them to a dedicated channel. The method of claim 16, And the dummy bit generator generates a dummy bit string to have the same number of bits as the number of data bits transmitted through the dedicated physical data channel when the data to be transmitted exists. The method of claim 16, And the dummy bit generator generates the dummy bit string to have a predetermined number of bits. delete delete delete The method of claim 3, And the dummy bit generator generates a dummy bit string to have the same number of bits as the number of data bits transmitted through the dedicated physical data channel when the data to be transmitted exists. The method of claim 3, And the dummy bit generator generates the dummy bit string to have a predetermined number of bits.