KR100929072B1 - Apparatus and method for transmitting and receiving channel quality identification information in code division multiple access communication system applying high speed forward packet access method - Google Patents

Abstract

The present invention provides a CQI (Channel Quality Indicator) transmitted by a terminal through an HS-DPCCH channel, which is an uplink channel for packet data communication in a code division multiple access communication system using a high speed downlink packet access method. A method and apparatus for strengthening the reliability of information. To this end, the code rate of the CQI information is changed depending on whether a fast forward packet access service is provided.

HSDPA, HS-DPCCH, Channel quality indicator, HS-pilot, coding

Description

Apparatus and method for transmitting / receiving channel quality identification information in a code division multiple access communication system applying a high speed forward packet access method

1 is a view showing an outline structure of an asynchronous communication system

2 is a diagram illustrating an example of an OVSF code used for HSDPA in a tree structure of an OVSF code.

3 is a diagram illustrating a time relationship between channels operated for HSDPA.

4 is a diagram illustrating a structure of an HS-SCCH channel for transmitting control information for an HS-PDSCH channel.

5 is a diagram illustrating a method of adding terminal identification information to an HS-SCCH channel for transmitting control information for an HS-PDSCH channel.

FIG. 6 illustrates an HS-DPCCH channel structure when no pilot is inserted into the HS-DPCCH, which is an uplink control channel for HSDPA.

FIG. 7 illustrates an HS-DPCCH channel structure when a pilot is inserted into the HS-DPCCH which is an uplink control channel for HSDPA.

8 is a diagram illustrating a structure of a transmission device of a terminal according to an embodiment of the present invention.

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

10 is a diagram illustrating a control flow for transmitting, by a terminal, channel quality identification information bits according to an embodiment of the present invention.

11 is a diagram illustrating a control flow in which a base station receives channel quality identification information bits according to an embodiment of the present invention.

12 is a diagram illustrating a structure of a transmission device of a terminal according to another embodiment of the present invention.

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

14 is a diagram illustrating a control flow for transmitting, by a terminal, channel quality identification information bits according to another embodiment of the present invention.

15 is a diagram illustrating a control flow in which a base station receives channel quality identification information bits according to another embodiment of the present invention.

The present invention relates to a mobile communication system supporting a fast forward packet access scheme, and more particularly, to an apparatus and a method for obtaining a channel quality indicator (CQI).

Today's mobile communication systems have evolved from providing initial voice-oriented services to high-speed, high-quality wireless data packet communication systems for providing data and multimedia services. In addition, the third generation mobile communication system which is currently divided into asynchronous (3GPP) and synchronous (3GPP2) has been standardized for high-speed, high-quality wireless data packet services. For example, in 3GPP, a standardization operation for a high speed downlink packet access (HSDPA) method is in progress, and in 3GPP2, a standardization operation for 1xEV-DV is in progress. This standardization work is a representative proof of the effort to find a solution for the high speed, high quality wireless data packet transmission service of 2Mbps or higher in the third generation mobile communication system, and the fourth generation mobile communication system is the higher speed, high quality multimedia. It is based on service provision.

On the other hand, the HSDPA scheme is a high speed downlink shared channel (HS-DSCH) for supporting forward high speed packet transmission in a code division multiple access communication system, control channels related thereto, apparatuses and methods therefor As well as the system generically.

FIG. 1 is a diagram illustrating a general structure of an asynchronous mobile communication system supporting the HSDPA method.

Referring to FIG. 1, the asynchronous mobile communication system includes a core network (hereinafter referred to as "CN") 100 and a plurality of radio network subsystems (hereinafter referred to as "RNS"). 110 and 120 and a mobile terminal (hereinafter referred to as UE) 130.

The RNS 110 is composed of a Radio Network Controller (hereinafter referred to as "RNC") 111 and a plurality of base stations 115 and 113. The RNS 120 also includes an RNC 112 and a plurality of base stations 114 and 116. On the other hand, it should be noted that the term "base station" is used interchangeably with the term "Node B" or "cell" for convenience of description below.

The RNCs 111 and 112 are classified into Serving RNCs (hereinafter referred to as "SRNC"), Drift RNCs (hereinafter referred to as "DRNC"), and Controlling RNCs (hereinafter referred to as "CRNC") according to their roles. The SRNC and the DRNC are classified according to supporting roles for respective UEs. That is, an RNC managing information of each UE and in charge of data transmission with the core network 100 is called an SRNC of the corresponding UE, and data from each UE is transmitted / received to the SRNC via an RNC other than the SRNC. When received, the RNC through which the data passes is referred to as DRNC of the corresponding UE. The CRNC refers to the RNC that controls each Node B as the CRNC of the Node B. For example, when the RNC 111 manages information of the UE 130, the RNC 111 becomes the SRNC of the UE 130. However, when the UE 130 moves and data is transmitted / received through the RNC 112, the RNC 112 becomes a DRNC of the UE 130. The RNC 111 controlling the base station 113 becomes a CRNC for the base station 113.

On the other hand, as described above, the HSDPA scheme is a standardization operation in 3GPP as a set of techniques for high-speed forward data transmission in an asynchronous mobile communication system. However, much of the discussion is still underway. Therefore, the following description will be described for the HSDPA method based on the results of the discussion so far for the matters that have not yet been determined.

In the asynchronous mobile communication system, high-speed forward data transmission is specifically implemented using a plurality of OVSF codes, adaptive channel coding, and a hybrid automatic re-transmission request (HARQ). The HARQ may be implemented in a fast retransmission and soft combining scheme. At this time, the maximum number of OVSF codes that can be applied to one UE in the HSDPA scheme is 15, and the modulation scheme is adaptively selected by QPSK, 16QAM, and 64QAM according to channel conditions. In addition, retransmission is performed between the UE and the Node B with respect to the errored data, and soft combining is performed on the retransmitted data to improve overall communication efficiency. The retransmission schemes are collectively referred to as n-channel SAW HARQ (Stop And Wait Hybrid Automatic Re-transmission Request) schemes.

In addition, a plurality of OVSF codes used to support the HSDPA scheme may be simultaneously used by a plurality of UEs at the same time. That is, OVSF code multiplexing is possible between multiple UEs at the same time. This will be described with reference to FIG. 2.

FIG. 2 illustrates an example of allocating an OVSF code in a mobile communication system supporting a conventional HSDPA scheme. In FIG. 2, the case where the diffusion coefficient is 16 (SF = 16) will be described as an example.

Referring to FIG. 2, each OVSF codes are shown as C (i, j) according to the location of the code tree. In C (i, j), the variable i represents a spreading coefficient value, and the variable j represents an order from the leftmost in the OVSF code tree. For example, C (16,0) refers to an OVSF code existing at the first position from the left in a row having the diffusion coefficient of 16 and the diffusion coefficient of 16. FIG. 2 illustrates that when the spreading factor is 16, 15 OVSF codes from 1st to 15th, that is, C (16,0) to C (16,14) in the OVSF code tree are transmitted to a communication system supporting the HSDPA scheme. The case of allocation is shown. The 15 OVSF codes can be multiplexed to a plurality of UEs. Table 1 shows an example in which OVSF codes are multiplexed.

UE #A UE #B UE #C t0 C (16,0) to C (16,5) C (16,6) to C (16,10) C (16,11) to C (16,14) t1 C (16,0) to C (16,3) C (16,4) to C (16,14) - t2 C (16,0) to C (16,3) C (16,4) to C (16,5) C (16,6) to C (16,14)

In Table 1, UEs #A, #B, and #C represent arbitrary UEs using a mobile communication system supporting the HSDPA scheme. As shown in Table 1, at any time point t0, t1, t2, the UE #A, B, C is code multiplexed using the assigned OVSF codes. The Node B determines the number of OVSF codes to allocate to each UE and the location on the OVSF code tree. This is determined in consideration of the amount of user data of each of the UEs stored in the Node B, the channel conditions set in each of the Node B and the UEs, and the like.

Accordingly, as control information exchanged between the UE and the Node B, the code information specifying the number of OVSF codes to be used by any UE and the location on the code tree, and the channel quality information necessary for adaptively determining the modulation scheme according to the channel situation And modulation scheme information, channel number information and ACK / NACK information necessary to support n-channel SAW HARQ.

Hereinafter, channels used for transmitting the control information and user data will be described.

In general, the types of channels used in the mobile communication system are classified into forward and reverse directions to support the HSDPA method as follows. First, the forward high speed common control channel (HS-SCCH), the associated dedicated dedicated physical channel (hereinafter referred to as "Associated DPCH"), and the high speed forward common physical channel. (High Speed-Physical Downlink Shared Channel, hereinafter referred to as "HS-PDSCH"). The reverse channel includes a reverse dedicated subphysical channel (hereinafter referred to as "HS-DPCCH").

The time relationship of each channel is as shown in FIG. First, the UE measures a channel quality between itself and a Node B using a first common pilot channel (PCPICH). The measurement result is notified to Node B using a channel quality indicator (CQI). The CQI is transmitted on the HS-DPCCH. Node B performs scheduling using the CQI. The scheduling determines, among a plurality of UEs receiving HSDPA service in the same cell, a UE to receive actual data at a next transmission time interval (hereinafter referred to as “TTI”). In addition, this refers to an operation of determining a modulation scheme to be used for the corresponding data transmission and the number of codes to be allocated. If data transmission for any UE is determined, the Node B transmits control information necessary for receiving the corresponding data through the HS-SCCH. At this time, the UE may identify the HS-SCCH to be received using the UE ID. In addition, the UE needs to receive only up to four HS-SCCHs in consideration of complexity. On the other hand, the cell may operate four or more HS-SCCHs to facilitate scheduling of packet data. The set of HS-SCCHs assigned to any one UE is called a "serving HS-SCCH set". The serving HS-SCCH set may be designated for each UE. Other details will be described later.

On the other hand, the control information included in the HS-SCCH is 7 bits of information (hereinafter referred to as "code information") for the OVSF codes to be used for the HS-PDSCH, 1 bit of the modulation scheme to be applied to the HS-PDSCH, through the HS-PDSCH There are 6 bits of data size and HARQ related information. The types of HARQ related information are as follows. A new data indicator indicating whether data to be transmitted through the HS-PDSCH is new data is 1 bit, and a redundancy version (hereinafter, referred to as "RV") of data to be transmitted through the HS-PDSCH. 3 bits, the channel number on the n-channel SAW HARQ of the data to be transmitted through the HS-PDSCH is 3 bits, and constitutes a total of 7 bits of HARQ information.

4 is a diagram showing a conventional structure of the above-described HS-SCCH. As shown in FIG. 4, the HS-SCCH is transmitted using an OVSF code having a spreading factor of 128, and is divided into three parts, Part-1, Part-2, and CRC. The 8-bit Part-1 information is transmitted through a first slot having 40 bits among the slots constituting the HS-SCCH frame, and the 13-bit Part-2 information and the 16-bit CRC constitute the HS-SCCH frame. Is transmitted through the second and third slots having 80 bits among the slots. In this way, by channel coding the Part-1 information and the Part-2 information separately, the terminal receives only the first slot for transmitting the Part-1 information, and any HS-SCCH among the four HS-SCCHs is the HS-PDSCH. It is possible to identify whether to transmit control information for reception.

Part-1 includes code information and a modulation scheme indicating a location on the code tree and the number of codes of an OVSF code to be used by a corresponding UE.

FIG. 5 illustrates a scrambling apparatus based on a UE ID for channel encoding of Part-1 information and UE identification after receiving Part-1 information.

Referring to FIG. 5, the Part-1 information is encoded by a convolutional code having a code rate of 1/2, and then rate matching is performed using 40 bits corresponding to one slot. On the other hand, the 10-bit UE ID is encoded into 32 bits by the (32,10) block code used for TFCI encoding in the Rel'99 standard, and then expanded to 40 bits by repetition, thereby performing an exclusive OR operation with 40 bits of the first slot. By taking (XOR) scrambling is done according to the UE ID.

Part-2 includes information on a transport block size, which means the size of data transmitted through HS-PDSCH, a channel number of n-channel SAW HARQ, and whether the data is new data. A new data indicator indicating whether the data is retransmitted and a redundancy version indicating the version of the data on the IR.

Finally, the CRC includes the Part-1 information and the CRC operation result for the UE identifier. The UE identifier is expected to use 10 bits. That is, although not actually transmitted, it is used for calculating the UE identifier in calculating the CRC at the transmitting side and also calculating the UE identifier in calculating the CRC at the receiving side. By doing so, the UE can determine whether the information contained in any HS-SCCH is its information. For example, when transmitting control information to any UE a using the HS-SCCH, the Node B calculates a CRC by using Part-1, Part-2, and the identifier of the UE a. The UE a determines that the HS-SCCH transmits control information about itself when no error occurs for the CRC when the UE a is calculated using its UE identifier together with Part-1 and Part-2.

UE operation for receiving the HS-SCCH is as follows. The UE generates a scrambling sequence using the stored UE ID to descramble the first slot of the four HS-SCCHs, and then performs Viterbi decoding on the convolutional code while assigning the HS- SCCH is identified to receive control information necessary for HS-PDSCH reception. After receiving the control information of the HS-SCCH, the UE determines whether an error occurs by calculating a CRC using Part-1 and Part-2 information and its UE ID. If an error does not occur, it is determined that control information for itself is received without error, and the decoding of the HS-PDSCH information is continued. However, if an error occurs in the CRC, decoding of the HS-PDSCH information is stopped.

The UE receives data transmitted through the HS-PDSCH based on the information received through the HS-SCCH and takes necessary measures such as demodulation. At this time, through the code information, it is determined through which OVSF code the HS-PDSCH transmitted, and how to demodulate through the modulation information. After the process is completed, it is determined whether an error occurs in the corresponding data through a CRC operation, and then ACK / NACK information is transmitted. That is, if an error does not occur, an ACK is transmitted. If an error occurs, NACK is transmitted.

The UE transmits ACK / NACK information on the packet data and CQI information on the downlink channel state through the HS-DPCCH. The structure of the HS-DPCCH is shown in FIG. As shown in FIG. 6, the diffusion rate of the HS-DPCCH is SF = 256, and the HS-DPCCH subframe includes 3 slots. ACK / NACK information is transmitted in the first slot of the HS-DPCCH subframe, and CQI information is transmitted in the second and third slots. At this time, if the 1-bit ACK / NACK information is repeated 10 times and transmitted in 10 bits, the 5-bit CQI information is (20, 5) channel coded and transmitted in 20 bits.

As described above, the UE supporting the conventional HSDPA scheme uses an uplink power control method for determining whether to transmit HS-pilot according to the presence or absence of HS-PDSCH packet data when positioned in the soft handover region. That is, when the UE supporting the conventional HSDPA scheme is in the soft handover region, neighboring Node Bs transmit the HS-PDSCH to the UE in downlink. Meanwhile, in order to enable Node B receiving the HS-DPCCH from the UE to efficiently perform channel compensation and power control for the HS-DPCCH, a pilot (HS-pilot) is applied to the HS-DPCCH as shown in FIG. 7. Can be inserted. Accordingly, the Node B may perform channel estimation, channel compensation, and power control on the HS-DPCCH independently of the existing uplink DPCCH using the HS-pilot.

However, the channel compensation and power control method using the HS-pilot always transmits the HS-Pilot even when there is no packet data transmitted through the HS-PDSCH when the UE is located in the soft handover region. There is a problem that uplink interference for a cell occurs continuously.

In order to solve this problem, the HS-Pilot may be transmitted only in a section from the UE detecting the HS-SCCH until the UE transmits the corresponding ACK / NACK information, and power control for the HS-DPCCH may be performed using the HS-Pilot. In this way, the amount of interference due to the transmission of the HS-Pilot can be reduced, but the CQI coding method should be changed to (20,5) and (15,5) depending on whether the HS-Pilot is transmitted.

As described above, the method of changing the code rate of the CQI information should be made according to HS-SCCH detection at the UE. That is, when the UE detects the HS-SCCH transmitted from the Node B, the CQI information is encoded and transmitted at a code rate of (15,5). If the UE does not detect the HS-SCCH, the CQI information is transmitted to (20,5). Encode and transmit at a code rate of.

However, transmission and reception errors of the HS-SCCH may occur between the base station and the terminal. In this case, the UE fails to detect the HS-SCCH and encodes and transmits CQI information at a code rate of (20, 5). Correspondingly, since Node B has already transmitted HS-PDSCH packet data to the UE, the Node B predicts that CQI information of HS-DPCCH is encoded by (15, 5). Therefore, the code rate of encoding and decoding of CQI information between the UE and the Node B is shifted, which may cause a problem that the Node B cannot obtain accurate CQI information. That is, when the HS-SCCH is not normally transmitted from the Node B to the UE, the CQI information from the UE to the Node B may not be correctly transmitted.

Accordingly, an object of the present invention to solve the above-described problem is to provide an apparatus and method for strengthening the reliability of channel quality identifier information transmission even when an HS-SCCH detection error occurs in a mobile terminal.

Another object of the present invention is to provide an apparatus and method for ensuring high reliability when acquiring a channel quality identifier in a mobile communication system supporting a forward fast packet access method.

Another object of the present invention is to determine whether to transmit the HS-Pilot according to whether the mobile station is located in the soft handover area and detect the HS-SCCH in support of the forward fast packet access scheme, and accordingly channel coding of the CQI information. In the case of changing the method, the present invention provides an apparatus and method for increasing the reliability of obtaining CQI information of a base station when an HS-SCCH detection error occurs in a mobile terminal.

In a first aspect for achieving the above object, the present invention provides channel quality identification information bits for informing a base station of the quality of a forward channel in a mobile terminal located in a soft handover region of a code division multiple access communication system. A method of transmitting a channel quality identifier information bit when a channel quality identifier information bit constituting a subframe of a reverse dedicated subphysical channel does not support high speed forward packet service, the code having a length of 20 Encoding is performed by the same code as the length 15 code used to support the fast forward packet service among the 20 bits of the code bits constituting the codeword. 15 bits of encoded bits are located in the channel quality identifier region. Array and rearranges the remaining coded bits to be placed on the high speed pilot zone is characterized in that it comprises the process.

In a second aspect for achieving the above object, the present invention provides channel quality identification information bits for informing a base station of the quality of a forward channel in a mobile terminal located in a soft handover region of a code division multiple access communication system. In a device for transmitting a channel quality identifier region and a high-speed pilot region constituting a sub-frame of a reverse dedicated secondary physical channel, a code having a length of 20 used to use the channel quality identification information bits when the high speed forward packet service is not supported. Encoding is performed by a coder that encodes a codeword having a length of 20 and outputs a codeword having a length of 20, and a code equal to a code of length 15 used when supporting the fast forward packet service among the 20-bit coded bits constituting the codeword. 15 bits of encoded bits are located in the channel quality identifier region. And a rearranger for rearranging the remaining coded bits to be located in the fast pilot region.

In the third aspect for achieving the above object, the present invention is rearranged by the channel quality identification information bits for informing the quality of the forward channel from the mobile terminal located in the soft handover area of the reverse dedicated secondary physical channel. A method for receiving the channel quality identifier information bits at a base station of a code division multiple access communication system when transmitted through a channel quality identifier region and a fast pilot region constituting a subframe, the channel quality identifier region and the fast pilot region Rearranging the channel quality identifier information bits transmitted through the reverse order of the rearrangement performed by the mobile terminal and outputting a codeword having a length of 20; and providing the fast forward packet service to the mobile terminal. 20 bits of encoded bits constituting a word Decoding the code, and if the high speed forward packet service is not provided to the mobile terminal, decoding the 20 bits of the codeword constituting the codeword as a code having a length of 15 and outputting the channel quality identification information bits. It is characterized by including.

In a fourth aspect for achieving the above object, the present invention provides a channel quality identification information bits for informing the quality of a forward channel from a mobile terminal located in a soft handover region, thereby reconstructing a reverse dedicated subphysical channel. An apparatus for receiving the channel quality identifier information bits at a base station of a code division multiple access communication system when transmitted through a channel quality identifier region and a fast pilot region constituting a subframe, the channel quality identifier region and the fast pilot region A rearranger for rearranging the channel quality identifier information bits transmitted through the reverse order of the rearrangement performed by the mobile terminal to output a codeword having a length of 20, and providing a fast forward packet service to the mobile terminal. 20 bits of encoded bits constituting the codeword are length 2 If the code is decoded as 0, and if the fast forward packet service is not provided to the mobile terminal, 20 bits of code bits constituting the codeword are decoded as a 15 length code to output the channel quality identification information bits. And a decoder.

In a fifth aspect for achieving the above object, the present invention provides a method for backward transmission of channel quality identification information bits for informing a base station of the quality of a forward channel in a mobile terminal located in a soft handover region of a code division multiple access communication system. In a method of transmitting a subframe of a dedicated subphysical channel, the sixteenth and seventeenth basevectors of the sixteenth and seventeenth basevectors are used in a basevector column of length 20 used when a high speed forward packet service is not supported. Outputting a codeword having a length of 20 by encoding the channel quality identification information bits by a base vector column formed by shifting to the positions of the base vectors and shifting the base vectors of the first to fifteenth positions; Images of the 20-bit coded bits constituting the sub-frame And sequentially placing the channel quality identifier region and the fast pilot region.

In a sixth aspect for achieving the above object, the present invention provides a method for backward transmission of channel quality identification information bits for informing a base station of the quality of a forward channel in a mobile terminal located in a soft handover region of a code division multiple access communication system. A device for transmitting data through a channel quality identifier region and a fast pilot region that constitute a subframe of a dedicated secondary physical channel, wherein the sixteenth and seventeenth in a base vector column of length 20 used when a high speed forward packet service is not supported. The channel quality identification information bits are encoded by a base vector column created by shifting respective first base vectors to the positions of the first and second base vectors of the base vector column, and shifting the first to fifth base vectors. An encoder for outputting 20 codewords, and said high speed forward direction A third to seventeenth encoding bits constituting the codeword when a controller for outputting a selection signal according to whether a packet service is provided and a selection signal indicating that the fast forward packet service is not provided from the controller are input; A codeword output unit for outputting only bits and outputting all 20 bits of coded bits constituting the codeword when a selection signal indicating that the fast forward packet service is not provided from the controller is output; Outputs high-speed pilot bits in the high-speed pilot region when a selection signal for providing a forward packet service is input, and outputs the high-speed pilot bits when a selection signal for indicating that the high-speed forward packet service is not provided from the controller. Switch does not output Characterized in that it comprises a multiplexer for multiplexing the high-speed pilot bits from the switch and the coded bits from the codeword output unit.

According to a seventh aspect for achieving the above object, the present invention provides a method for substituting a reverse dedicated secondary physical channel by rearranging channel quality identification information bits for informing a quality of a forward channel from a mobile terminal located in a soft handover region. A method for receiving the channel quality identifier information bits at a base station of a code division multiple access communication system when transmitted through a channel quality identifier region and a fast pilot region constituting a frame, the channel quality identifier region and the high speed of the subframe. The sixteenth and seventeenth base vectors of the base vector column of length 20 used for extracting the coded bits from the pilot region and when not supporting the fast forward packet service are first and second of the base vector columns. Move it to the position of the basis vectors, And decoding the extracted encoded bits by the basis vector sequence generated by shifting the basis vectors, and outputting the channel quality identification information bits.

In the eighth aspect for achieving the above object, the present invention provides a channel quality identification information bits for informing the quality of the forward channel from the mobile terminal located in the soft handover region, so that the subchannels of the reverse dedicated secondary physical channel are rearranged. An apparatus for receiving the channel quality identifier information bits at a base station of a code division multiple access communication system when transmitted through a channel quality identifier region and a fast pilot region constituting a frame, the channel quality identifier region and the high speed of the subframe. A demultiplexer that extracts coded bits from the pilot region, and the first and second basis vectors of the sixteenth and seventeenth basevector columns in a base vector column of length 20 used when no fast forward packet service is supported. Move to position, first to fifteenth basis vectors And a decoder for outputting the channel quality identification information bits by decoding the extracted coded bits by a basis vector sequence generated by shifting the.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

In the embodiment of the present invention to be described later, when the UE is located in the soft handover area and transmits the HS-Pilot according to whether to detect the HS-SCCH, and accordingly the channel encoding method of the CQI information is changed, the conventional HS- In order to overcome the problems caused by the SCCH detection error, a technique for transmitting CQI information is implemented.

1. First embodiment

In an embodiment of the present invention to be described below, the HS-pilot is not inserted into the subframe of the HS-DPCCH as shown in FIG. 6 and the HS-pilot 5 bits (for example, as shown in FIG. 7). For example, a method of improving the reliability of CQI information transmission is proposed for each of two-bit HS-pilot and three-bit HS-pilot).

First, referring to FIG. 6, the case in which the HS-pilot is not inserted is described. The UE encodes 5-bit CQI information into 20 bits to transmit the HS-DPCCH. Orthogonal codes of length 20 are required to encode the 5-bit CQI information into 20 bits. In Table 2, linear combinations of five basis vectors of length (i) 20 corresponding to the orthogonal code of length 20 (M _{i, 0} , M _{i, 1} , M _{i, 2} , M _{i, 3} , _{Mi, 4} ) is shown. That is, Table 2 below shows an example of a basis vector for CQI encoding when a pilot is not inserted into the HS-DPCCH, which is an uplink control channel for supporting the HSDPA service.

i M _{i, 0} M _i.1 M _{i, 2} M _{i, 3} M _{i, 4} 0 One 0 0 0 One One 0 One 0 0 One 2 One One 0 0 One 3 0 0 One 0 One 4 One 0 One 0 One 5 0 One One 0 One 6 One One One 0 One 7 0 0 0 One One 8 One 0 0 One One 9 0 One 0 One One 10 One One 0 One One 11 0 0 One One One 12 One 0 One One One 13 0 One One One One 14 One One One One One 15 0 0 0 0 One 16 0 0 0 0 One 17 0 0 0 0 One 18 0 0 0 0 One 19 0 0 0 0 One

On the other hand, the linear combination of five basis vectors of length 20 illustrated in Table 2 enables the optimal (20,5) channel coding to be applied as shown in Equation 1 below.

, i = 0, 1, …, 19

, i = 0, 1,... , 19

Here, a _n is a CQI information bit, and b _i is an output bit in which channel encoding is performed on the CQI information bit. i is a parameter for specifying any bit position among bits of the orthogonal code, and M _{i, n} is a code of length 20.

For example, the CQI channel encoding having the code rate of (20, 5) will be described below.

When the arbitrary 5 bits of CQI information is a = [0 1 1 0 0], the first bit b ₀ of the 20 bits of the encoded output bits is represented by Equation 1 and Table 2. When calculated by applying, it is as shown in Equation 2 below.

In this manner, the remaining 19 bits b ₁ to b ₁₉ of the CQI codeword encoded at the code rates 20 and 5 may also be calculated.

Next, a case of inserting an HS-pilot with reference to FIG. 7 will be described. The UE encodes 5 bits of CQI information into 15 bits to transmit the HS-DPCCH. Orthogonal codes of length 15 are required to encode the 5-bit CQI information into 15 bits. In Table 3, linear combinations of five basis vectors of length (i) 15 corresponding to the orthogonal code of length 15 (M _{i, 0} , M _{i, 1} , M _{i, 2} , M _{i, 3} , _{Mi, 4} ) is shown. That is, Table 3 shows an example of a basis vector for CQI encoding when a pilot is inserted into the HS-DPCCH, which is an uplink control channel for supporting HSDPA.

i M _{i, 0} M _{i, 1} M _{i, 2} M _{i, 3} M _{i, 4} 0 One 0 0 0 One One 0 One 0 0 One 2 One One 0 0 One 3 0 0 One 0 One 4 One 0 One 0 One 5 0 One One 0 One 6 One One One 0 One 7 0 0 0 One One 8 One 0 0 One One 9 0 One 0 One One 10 One One 0 One One 11 0 0 One One One 12 One 0 One One One 13 0 One One One One 14 One One One One One

On the other hand, by the linear combinations of the five basis vectors of length 15 illustrated in Table 3, the optimal (15,5) channel coding can be applied as shown in Equation 3 below.

, i = 0, 1, …, 14

, i = 0, 1,... , 14

Here, a _n is a CQI information bit, b _i is an output bit in which channel encoding is performed on the CQI information bit, and M _{i, n} is a code having a length of 15. The CQI channel coding having a code rate of (15,5) has a difference in the basis vector used in the calculation when compared with the CQI channel coding having a code rate of (20,5).

When the UE transmits 5 bits of CQI information bits on the HS-DPCCH, it is determined whether to transmit the HS-pilot on the HS-DPCCH according to whether the HS-SCCH is detected. Accordingly, when the HS-pilot is not transmitted, the CQI information bits are encoded using (20,5) coding using a basis vector having a length of 20 shown in Table 2 above. However, when the HS-pilot is transmitted, (15,5) coding is applied using a basis vector having a length of 15 shown in Table 3. Comparing the basis vector shown in <Table 2> and the basis vector shown in <Table 3>, the basis vector of <Table 3> is 5 of the back of 20 bits of the basis vector of <Table 2>. It can be seen that the remaining 15 bits except the bit. That is, b ₀ , b ₁ ,... Of the output bits. , b ₁₄ are output bits that are commonly output regardless of which code (20,5) or code (15,5) is applied. Thus, b ₀ , b ₁ ,... If b ₁₄ is transmitted at the same location regardless of whether a (20,5) code or a (15,5) code is used, the Node B may transmit the CQI information transmitted from the UE even if the UE has not detected the HS-SCCH. Can be decoded. That is, the UE does not detect the HS-SCCH and encodes and transmits the CQI information bits as the (20,5) code, and the Node B wants the CQI information even if the decoding bits from the UE are decoded by the (15,5) code. The bits can be received.

In order to apply the technique of the present invention proposed above, a permutation block is added to a configuration for encoding CQI information bits using a (20,5) code to convert a bit array of codewords output by the encoding. Let's do it. For example, the portion in which the CQI is transmitted in the sub-frame of the HS-DPCCH shown in FIG. 7 with the encoding bits b ₀ , b ₁ ,..., B ₁₄ encoded using the basis vector of Table 2. Arrange correspondingly. Then, the encoded bits b ₁₅ , b ₁₆ ,..., B ₁₉ with the remaining encoding are arranged in correspondence with the portion where the 5-bit HS-Pilot is transmitted in the sub-frame of the HS-DPCCH shown in FIG. 7. . For example, b ₁₅ , b ₁₆ are arranged at the HS-Pilot position of the second slot, and b ₁₇ , b ₁₈ , b ₁₉ are arranged at the HS-Pilot position of the third slot. Thus, even if Node B performs decoding on the (15,5) CQI codeword according to the HS-DPCCH subframe structure of FIG. 7, CQI information can be obtained. B ₁₅ , b ₁₆ ,. It is apparent that the arrangement of b ₁₉ may be properly distributed by the form in which the HS-pilot is transmitted.

8 is a diagram illustrating a structure of a transmission device of a UE according to an embodiment of the present invention. In FIG. 8, only the configuration of the HS-DPCCH which is directly related to the embodiment of the present invention among the channels such as DPCCH, DPDCH, and HS-DPCCH transmitted by the UE in the uplink is illustrated. The HS-DPCCH may be transmitted on an I channel or a Q channel.

Hereinafter, referring to FIG. 8, 5-bit CQI information is input to the (20, 5) CQI channel encoder 804. The (20,5) CQI channel encoder 804 encodes the CQI information using the basis vector illustrated in Table 2. Therefore, the CQI channel encoder 804 outputs a codeword composed of 20 bits of encoded bits through the encoding. The codeword consisting of the 20-bit coded bits is transferred to a remuter 807. As described above, the rearrangement unit 807 rearranges the bit order of the coded bits so that the receiver can decode the CQI information regardless of the presence or absence of the HS-pilot region in the sub-frame of the HS-DPCCH. For example, b ₀ , b ₁ ,... , b ₁₄ is rearranged to be located in the CQI region constituting the sub-frame of the HS-DPCCH. Then, b ₁₅ and b ₁₆ of the encoded bits are rearranged to be located in the HS-Pilot area of the second slot, and b ₁₇ , b ₁₈ and b ₁₉ are rearranged to be located in the HS-Pilot area of the third slot. In summary, the order of the output bits of the CQI codeword is b ₀ , b ₁ , ..., b ₁₉ to b ₁₅ , b ₁₆ , b ₀ , b ₁ , ..., b ₁₃ , b ₁₄ , b ₁₇ , b ₁₈ , b ₁₉ . The output of the rearranger 807 with the order of the bits rearranged is passed to a CQI codeword output 803.

The HS-SCCH detector 801 detects the presence of the HS-SCCH from Node B, and transmits whether the HS-SCCH is detected to the CQI channel coding controller 802 and the HS-pilot controller 800. The CQI channel encoding controller 802 controls the CQI codeword output unit 803 by determining an output bit of the CQI codeword based on whether the HS-SCCH is detected. The HS-pilot controller 800 determines whether to insert the HS-pilot by detecting the HS-SCCH. That is, when the HS-SCCH is detected by the HS-SCCH detector 801, the output bit of the CQI codeword information is controlled to 15 bits, thereby inserting 5 bits of the HS-pilot. In this case, therefore, encoded bits encoded by the code rates (15, 5) are output. However, if the HS-SCCH is not detected by the HS-SCCH detector 801, all 20 bits of the CQI codeword are output and the HS-pilot is not inserted. Therefore, in this case, coded bits encoded by the code rates 20 and 5 are output.

At the instruction of the HS-pilot controller 800, the switch 806 transfers the HS-pilot to the multiplexer 808 or not. The 1-bit ACK / NACK information is repeated 10 times by the repeater 805, and 10 bits of the repetition are transmitted to the multiplexer 808. The multiplexer 808 multiplexes ACK / NACK information, CQI codewords, and HS-pilot to output the HS-DPCCH subframe of the structure shown in FIG. 6 or 7. The subframe is multiplied by the channel gain by the first multiplier 810 and spread by the OVSF code in the second multiplier 812. The spread signal is scrambled by the third multiplier 814 and then modulated into a bandpass signal by the modulator 816, and the modulated signal is transmitted through the antenna 820 via the RF unit 818. do.

FIG. 9 is a diagram illustrating a structure of a receiver of a base station corresponding to the transmitter of the UE shown in FIG. 8.

Referring to FIG. 9, the signal received from the antenna 920 passes through the RF unit 918, the demodulator 916, the descrambler 914, and the despread 912 in the reverse order of the transmitter, and then the channel compensator. Channel distortion is compensated for at 910. The channel estimate for the channel compensation may be obtained by using pilot bits of the existing uplink DPCCH or using HS-pilot when the HS-pilot is transmitted. Since the operation of the channel compensator 910 and the demultiplexer 908 depends on the existence of the HS-pilot, the operation of the channel compensator 910 and the demultiplexer 908 is controlled by the HS-pilot controller 900. The HS-pilot controller 900 is controlled by the base station scheduler 901. The scheduler 901 determines the presence or absence of the HS-SCCH previously transmitted to the UE, and transmits the CQI codeword and HS-pilot information on the received signal to the CQI channel decoding controller 902 and the HS-pilot controller 900. To each. That is, if there is an HS-SCCH previously transmitted to the UE, it is assumed that the received signal is composed of 15 bits of CQI codeword and 5 bits of HS-pilot. Otherwise, it is assumed that only the CQI codeword 20 bits are included. The output of the channel compensator 910 is separated into ACK / NACK and CQI codewords by the demultiplexer 908, and then decoded by the ACK / NACK decoder 906 and the CQI channel decoder 904, respectively. Bit ACK / NACK information and 5-bit CQI information are output. In this case, since the CQI codewords output from the demultiplexer 908 are rearranged in the terminal transmitter, the rearrangement operation should be performed by an inverse permuter 907. The CQI channel decoder 904 is controlled by the CQI channel decoding controller 902. When the HS-pilot is not transmitted, the CQI channel decoder 904 performs decoding on the (20, 5) code, and the HS-pilot is transmitted. In this case, decoding of the (15,5) code is performed.

10 is a diagram illustrating a control flow for transmitting CQI information bits in a UE according to an embodiment of the present invention.

Referring to FIG. 10, in step 1000, the UE performs CQI encoding using codes having a code rate of 20 and 5 for 5 bits of CQI information bits regardless of whether HS-SCCH is detected. Outputs a CQI codeword made up of bits. In step 1001, the UE performs bit rearrangement on the CQI codeword having the length of 20 bits. For example, b ₀ , b ₁ ,... , b ₁₄ is rearranged so as to be located in the CQI region constituting the sub-frame of the HS-DPCCH when using the (15, 5) code. Then, b ₁₅ and b ₁₆ of the encoded bits are rearranged to be located in the HS-Pilot area of the second slot, and b ₁₇ , b ₁₈ and b ₁₉ are rearranged to be located in the HS-Pilot area of the third slot. As an example of the relocation, the 20-bit codeword is output in the order of b ₁₅ , b ₁₆ , b ₀ , b ₁ , ... b ₁₃ , b ₁₄ , b ₁₇ , b ₁₈ , and b ₁₉ .

In step 1002, the UE determines whether to detect the HS-SCCH transmitted from the Node B to itself. If the HS-SCCH is not detected, the process proceeds to step 1004. If the HS-SCCH is detected, the process proceeds to step 1006. In step 1004, the UE transmits the rearranged 20-bit coded bits. In step 1008, the UE multiplexes the encoded 10-bit ACK / NACK information and the 20-bit encoded bits in which the rearrangement is performed.

However, if the UE proceeds to step 1006, the UE has 15 bits corresponding to the output of the (15,5) CQI code among the rearranged 20-bit encoded bits, that is, b ₀ , b ₁ ,... , b ₁₄ only. In the above example, the rearranged b ₁₅ , b ₁₆ , b ₀ , b ₁ ,. the first 2 bits (coded bits encoded as b ₁₅ , b ₁₆ ) from b ₁₃ , b ₁₄ , b ₁₇ , b ₁₈ and b ₁₉ , and the last 3 bits encoded as b ₁₇ , b ₁₈ , b ₁₉ Bits remaining). In step 1010, the UE multiplexes and transmits the encoded 10-bit ACK / NACK information, 2 bits of HS-pilot, 15 bits of encoded bits, and 3 bits of HS-pilot.

11 is a diagram illustrating a control flow of receiving CQI information in a Node B according to an embodiment of the present invention.

Referring to FIG. 11, in step 1100, the Node B rearranges the remaining output signals except for the encoded ACK / NACK information among the signals output through the demultiplexer. At this time, the rearrangement is performed by the reverse order of the rearrangement performed by the UE to transmit the CQI information. Through the rearrangement of the terminal transmission unit and the reverse rearrangement of the base station receiver proposed in the present invention, it is possible to prevent CQI information acquisition failure that may occur in the Node B due to the HS-SCCH detection error of the UE. That is, if the Node B transmits the HS-SCCH in downlink, the Node B expects to receive the CQI codeword encoded by (15, 5) from the UE. However, if the UE transmits the CQI codeword encoded by (20,5) due to an HS-SCCH detection error, the code rate of the CQI codeword does not match between Node B and the UE, so that Node B acquires CQI information. You will not be able to. However, as shown in <Table 2> and <Table 3>, CQI codes of two types (20, 5) and (15, 5) can utilize the feature that the basis vector is the same up to the first 15 bits. That is, if the CQI codeword arrangement of 20 bits transmitted from the UE is made equal to the value encoded by (15,5) up to the first 15 bits from the Node B receiver, the Node B decodes the CQI codeword into (15,5). Even if the CQI information can be obtained without error.

In step 1101 of FIG. 11, the NodeB determines whether the HS-SCCH has been transmitted to the UE by the scheduler. If the HS-SCCH has not been transmitted, the 20-bit rearranged CQI codeword output is extracted in step 1102. In step 1104, the Node B decodes the (20,5) CQI code from the output value in step 1102. However, if it is determined in step 1101 that the HS-SCCH is transmitted, the Node B outputs 15 bits of the coded bits constituting the rearranged CQI codeword in step 1106. In operation 1108, the Node B performs decoding using the (15,5) CQI code on the output 15-bit encoded bits. Through the above procedure, the present invention can prevent failure of acquiring CQI information in Node B due to HS-SCCH detection error of the UE.

2. Second embodiment

A second embodiment for converting a bit array of CQI codewords, which is limited by the present invention, can be considered. The same effect as in the first embodiment using the exchange block can be obtained by changing the basis vector used for CQI encoding without using the permutation block added in the above-described first embodiment. That is, as shown in Table 4 below, by constructing a basis vector for (20,5) CQI encoding, CQI codewords having rearranged bit arrays can be generated as in the first embodiment.

i M _{i, 0} M _i.1 M _{i, 2} M _{i, 3} M _{i, 4} 0 0 0 0 0 One One 0 0 0 0 One 2 One 0 0 0 One 3 0 One 0 0 One 4 One One 0 0 One 5 0 0 One 0 One 6 One 0 One 0 One 7 0 One One 0 One 8 One One One 0 One 9 0 0 0 One One 10 One 0 0 One One 11 0 One 0 One One 12 One One 0 One One 13 0 0 One One One 14 One 0 One One One 15 0 One One One One 16 One One One One One 17 0 0 0 0 One 18 0 0 0 0 One 19 0 0 0 0 One

The basis vector of Table 4 is a reconstruction of the basis vector of Table 2. That is, each of the basis vectors corresponding to i = 15,16 in Table 2 is reconstructed into basis vectors corresponding to i = 0,1 in Table 4, and i = in Table 2 Each of the basis vectors corresponding to 0, ..., 14 was reconstructed into basis vectors corresponding to i = 2, ... 16 in Table 4 above. Then, each of the basis vectors corresponding to i = 17, 18, and 19 in Table 2 was reconstructed to the same position in Table 4.

12 is a diagram illustrating a structure of a transmission apparatus of a UE according to the second embodiment of the present invention. In FIG. 12, only the configuration of the HS-DPCCH which is directly related to the embodiment of the present invention among the channels of the DPCCH, DPDCH, HS-DPCCH, etc. transmitted by the UE is shown. The HS-DPCCH may be transmitted on an I channel or a Q channel.

Hereinafter, referring to FIG. 12, 5-bit CQI information is input to the (20, 5) CQI channel encoder 1204. The (20,5) CQI channel encoder 1204 encodes the CQI information by using the basis vector illustrated in Table 4. Therefore, the CQI channel encoder 1204 outputs a codeword consisting of 20 bits of encoded bits through the encoding. As described above, the codewords are separately rearranged as a result of rearranging the bit order of the codewords so that the CQI information can be decoded at the receiver regardless of the presence or absence of the HS-pilot region in the subframe of the HS-DPCCH. Will not need it. When the CQI information is encoded using the <Table 4>, the order of the output bits of the CQI codeword is b ₀ , b ₁ , ..., b ₁₉ to b ₁₅ , b ₁₆ , b ₀ , b ₁ ,. .., has the effect of changing to b ₁₃ , b ₁₄ , b ₁₇ , b ₁₈ , b ₁₉ . The output of the CQI channel encoder 1204 is transferred to the CQI codeword output unit 1203.

The HS-SCCH detector 1201 detects whether the HS-SCCH from Node B is present, and transmits whether the HS-SCCH is detected to the CQI channel coding controller 1202 and the HS-pilot controller 1200. The CQI channel coding controller 1202 controls the CQI codeword output unit 1203 by determining an output bit of the CQI codeword based on whether the HS-SCCH is detected. The HS-pilot controller 1200 determines whether to insert the HS-pilot by detecting the HS-SCCH. That is, when the HS-SCCH is detected by the HS-SCCH detector 1201, the output bit of the CQI codeword information is controlled to 15 bits, thereby inserting 5 bits of the HS-pilot. In this case, therefore, encoded bits encoded by the code rates (15, 5) are output. However, if the HS-SCCH is not detected by the HS-SCCH detector 1201, all 20 bits of the CQI codeword are output and the HS-pilot is not inserted. Therefore, in this case, coded bits encoded by the code rates 20 and 5 are output.

By the instruction of the HS-pilot controller 1200, the switch 1206 transfers the HS-pilot to the multiplexer 1208 or not. The 1-bit ACK / NACK information is repeated 10 times by the repeater 1205, and 10 bits of the repetition are transmitted to the multiplexer 1208. The multiplexer 1208 multiplexes ACK / NACK information, CQI codewords, and HS-pilot to output the HS-DPCCH subframe of the structure shown in FIG. 6 or 7. The subframe is multiplied by the channel gain by the first multiplier 1210 and spread by the OVSF code in the second multiplier 1212. The spread signal is scrambled by the third multiplier 1214 and then modulated into a bandpass signal by the modulator 1216, and the modulated signal is transmitted through the antenna 1220 through the RF unit 1218. do.

FIG. 13 is a diagram illustrating a structure of a receiver of a base station corresponding to the transmitter of the UE shown in FIG. 12.

Referring to FIG. 13, the signal received from the antenna 1320 passes through the RF unit 1318, the demodulator 1316, the descrambler 1314, and the despread 1312 in the reverse order of the transmitter. Channel distortion is compensated for at 1310. The channel estimate for the channel compensation may be obtained by using pilot bits of the existing uplink DPCCH or using HS-pilot when the HS-pilot is transmitted. Since the operation of the channel compensator 1310 and the demultiplexer 1308 depends on the existence of the HS-pilot, the operation of the channel compensator 1310 and the demultiplexer 1308 is controlled by the HS-pilot controller 1300. Meanwhile, the HS-pilot controller 1300 is controlled by the base station scheduler 1301. The scheduler 1301 determines whether the HS-SCCH has been previously transmitted to the UE, and provides the determination result to the CQI channel decoding controller 1302 and the HS-pilot controller 1300, respectively. In other words, if there is an HS-SCCH previously transmitted to the UE, it is assumed that the received signal is composed of 15 bits of CQI codeword and 5 bits of HS-pilot. Otherwise, it is assumed that only 20 bits of the CQI codeword are included. The output of the channel compensator 1310 is separated into an ACK / NACK and a CQI codeword by the demultiplexer 1308, and then decoded by the ACK / NACK decoder 1306 and the CQI channel decoder 1304, respectively, to obtain a final 1 Bit ACK / NACK information and 5-bit CQI information are output. The CQI channel decoder 1304 is controlled by the CQI channel decoding controller 1302. When the HS-pilot is not transmitted, the CQI channel decoder 1304 performs decoding on the (20, 5) code, and the HS-pilot transmits the code. In this case, decoding of the (15,5) code is performed. In this case, the basis vector of Table 4 is used when decoding the (20,5) code. Therefore, no separate inverse rearranger is used.

14 is a diagram illustrating a control flow for transmitting CQI information bits in a UE according to a second embodiment of the present invention.

Referring to FIG. 14, in step 1400, the UE performs CQI encoding using codes having a code rate of 20 and 5 for 5-bit CQI information bits regardless of whether HS-SCCH is detected and encodes 20 bits. Outputs a CQI codeword made up of bits. At this time, the rearranged CQI codewords are output by using the basis vector shown in Table 4. For example, b ₀ , b ₁ ,... , b ₁₄ is rearranged to be located in the CQI region constituting the sub-frame of the HS-DPCCH. Then, b ₁₅ and b ₁₆ of the encoded bits are rearranged to be located in the HS-Pilot area of the second slot, and b ₁₇ , b ₁₈ and b ₁₉ are rearranged to be located in the HS-Pilot area of the third slot.

In step 1402, the UE determines whether the HS-SCCH transmitted from the Node B to itself is detected. If the HS-SCCH is not detected, the process proceeds to step 1404. If the HS-SCCH is detected, the process proceeds to step 1406. In step 1404, the UE outputs the 20 bits of encoded bits. In the above example, a 20-bit codeword is assigned to b ₁₅ , b ₁₆ , b ₀ , b ₁ ,. , b ₁₃ , b ₁₄ , b ₁₇ , b ₁₈ , b ₁₉ . The UE multiplexes and transmits the 10-bit ACK / NACK information encoded in step 1408 and the 20-bit encoded bits.

However, if the UE proceeds to step 1406, the UE has 15 bits corresponding to the output of the (15,5) CQI code among the rearranged CQI codewords, that is, b ₀ , b ₁ ,... , b ₁₄ In the above example, the rearranged 20-bit CQI codewords b ₁₅ , b ₁₆ , b ₀ , b ₁ ,. This corresponds to the remainder of removing the first two bits (b ₁₅ , b ₁₆ ) and the last three bits (b ₁₇ , b ₁₈ , b ₁₉ ) of, b ₁₃ , b ₁₄ , b ₁₇ , b ₁₈ , and b ₁₉ . In step 1410, the UE multiplexes and transmits the encoded 10-bit ACK / NACK information, 2 bits of HS-pilot, 15 bits of CQI codeword, and 3 bits of HS-pilot.

FIG. 15 is a diagram illustrating a control flow of receiving CQI information in a Node B according to a second embodiment of the present invention.

Referring to FIG. 15, in step 1500, it is determined whether the HS-SCCH is transmitted to the UE by the Node B scheduler. If the HS-SCCH has not been transmitted, a 20-bit rearranged CQI codeword output is extracted in step 1502. In step 1504, the Node B decodes the (20,5) CQI code from the output value in step 1502. At this time, CQI information is obtained by decoding using the basis vector of Table 4. However, if it is determined in step 1501 that the HS-SCCH is transmitted, the Node B extracts 15 bits corresponding to the (15,5) CQI codeword among the coded bits constituting the CQI codeword in step 1506. For example, referring to FIG. 7, 15 bits are extracted at a position corresponding to the CQI of the HS-DPCCH subframe. In operation 1508, the Node B performs decoding using the (15,5) CQI code on the output 15-bit encoded bits. Through the above procedure, the present invention can prevent failure of acquiring CQI information in Node B due to HS-SCCH detection error of the UE.

As described above, the present invention has the effect of improving the reliability of the CQI information by transmitting the CQI information bits so that the mobile station can receive the CQI information bits at the base station regardless of whether the HS-SCCH is obtained.

Claims (15)

In the mobile terminal located in the soft handover area of the code division multiple access communication system, channel quality identifier information bits for informing the base station of the quality of the forward channel to the base station are composed of a channel quality identifier region and a high-speed pilot that constitute a subframe of a reverse dedicated subphysical channel. In a method of transmitting through an area, Outputting a codeword of length 20 by encoding the channel quality identification information bits as a length 20 code used when a high speed forward packet service is not supported; The 15-bit coded bits of the 20-bit coded bits constituting the codeword, which are encoded by the same code as the length 15 code used to support the fast forward packet service, are located in the channel quality identifier region. Reordering and rearranging the remaining coded bits in the fast pilot region. 2. The method of claim 1, wherein when providing the fast forward packet service, fast pilot bits are placed in place of the remaining coded bits rearranged in the fast pilot region. In the mobile terminal located in the soft handover area of the code division multiple access communication system, channel quality identifier information bits for informing the base station of the quality of the forward channel to the base station are composed of a channel quality identifier region and a high-speed pilot that constitute a subframe of a reverse dedicated subphysical channel. An apparatus for transmitting through an area, An encoder for encoding the channel quality identification information bits as a code having a length of 20 used when a high speed forward packet service is not supported and outputting a codeword having a length of 20; The 15-bit coded bits of the 20-bit coded bits constituting the codeword, which are encoded by the same code as the length 15 code used to support the fast forward packet service, are located in the channel quality identifier region. And a rearranger for rearranging and rearranging the remaining coded bits in the fast pilot region. The method of claim 3, A controller for outputting a selection signal according to whether the high speed forward packet service is provided; Outputting only the 15-bit encoded bits rearranged to be located in the channel quality identifier region among the rearranged 20-bit encoded bits when the selection signal indicating the provision of the fast forward packet service is input from the controller; A codeword output unit for outputting all of the rearranged 20-bit coded bits when a selection signal indicating that the fast forward packet service is not provided from the controller is input; When a selection signal indicating the provision of the fast forward packet service is input from the controller, when the selection signal indicating that the fast forward packet service is not provided is output, the high speed pilot bits are output in the fast pilot region. A switch that does not output the fast pilot bits; And a multiplexer for multiplexing the encoded bits from the codeword output and the fast pilot bits from the switch. The channel quality identification information bits for informing the quality of the forward channel from the mobile terminal located in the soft handover region are rearranged and transmitted through the channel quality identifier region and the fast pilot region that constitute a subframe of the reverse dedicated subphysical channel. A method for receiving the channel quality identification information bits at a base station of a split multiple access communication system, Rearranging the channel quality identifier information bits transmitted through the channel quality identifier region and the fast pilot region in a reverse order of rearrangement performed by the mobile terminal, and outputting a codeword having a length of 20; If a high speed forward packet service is provided to the mobile terminal, the 20-bit coded bits constituting the codeword are decoded as a code having a length of 20. If the high speed forward packet service is not provided to the mobile terminal, the code is decoded. And decoding the encoded bits of the 20 bits constituting the word as codes having a length of 15 to output the channel quality identification information bits. The channel quality identification information bits for informing the quality of the forward channel from the mobile terminal located in the soft handover region are rearranged and transmitted through the channel quality identifier region and the fast pilot region that constitute a subframe of the reverse dedicated subphysical channel. An apparatus for receiving the channel quality identification information bits at a base station of a split multiple access communication system, A rearranger for rearranging the channel quality identifier information bits transmitted through the channel quality identifier region and the fast pilot region in a reverse order of rearrangement made by the mobile terminal and outputting a codeword having a length of 20; If a high speed forward packet service is provided to the mobile terminal, the 20-bit coded bits constituting the codeword are decoded as a code having a length of 20. If the high speed forward packet service is not provided to the mobile terminal, the code is decoded. And a decoder which decodes 20 bits of encoded bits constituting a word as a code having a length of 15 and outputs the channel quality identification information bits. A method for transmitting channel quality identification information bits for informing a base station of a quality of a forward channel to a base station in a soft handover region of a code division multiple access communication system through a subframe of a reverse dedicated subphysical channel, Move the sixteenth and seventeenth basevectors to the positions of the first and second basis vectors in a base vector column of length 20 used when no high-speed forward packet service is supported. Outputting a codeword having a length of 20 by encoding the channel quality identification information bits by a basis vector sequence generated by shifting basis vectors; And sequentially placing the 20-bit coded bits constituting the codeword into a channel quality identifier region and a fast pilot region constituting the subframe. In the mobile terminal located in the soft handover area of the code division multiple access communication system, channel quality identifier information bits for informing the base station of the quality of the forward channel to the base station are composed of a channel quality identifier region and a high-speed pilot that constitute a subframe of a reverse dedicated subphysical channel. A device for transmitting over an area, Move the sixteenth and seventeenth base vectors from the base vector column of length 20 used when the high speed forward packet service is not supported, to the positions of the first and second base vectors of the base vector column. An encoder for outputting a codeword having a length of 20 by encoding the channel quality identification information bits by a basis vector sequence formed by shifting fifth basis vectors; A controller for outputting a selection signal according to whether the high speed forward packet service is provided; When the selection signal indicating the provision of the fast forward packet service is input from the controller, only the third to seventeenth coded bits constituting the codeword are output, and the fast forward packet service is not provided from the controller. A codeword output unit for outputting all of the 20-bit coded bits constituting the codeword when a selection signal for inputting a signal is input; When a selection signal indicating the provision of the high speed forward packet service is input from the controller, when the selection signal indicating that the high speed forward packet service is not provided is output, the high speed pilot bits are output in the high speed pilot area. A switch that does not output the fast pilot bits; And a multiplexer for multiplexing the encoded bits from the codeword output and the fast pilot bits from the switch. The channel quality identification information bits for informing the quality of the forward channel from the mobile terminal located in the soft handover region are rearranged and transmitted through the channel quality identifier region and the fast pilot region that constitute a subframe of the reverse dedicated subphysical channel. A method for receiving the channel quality identification information bits at a base station of a split multiple access communication system, Extracting coded bits from the channel quality identifier region and the fast pilot region of the subframe; Move the sixteenth and seventeenth base vectors from the base vector column of length 20 used when the high speed forward packet service is not supported to the positions of the first and second base vectors of the base vector column. And decoding the extracted encoded bits by a basis vector sequence generated by shifting fifteenth basis vectors to output the channel quality identification information bits. The channel quality identification information bits for informing the quality of the forward channel from the mobile terminal located in the soft handover region are rearranged and transmitted through the channel quality identifier region and the fast pilot region that constitute a subframe of the reverse dedicated subphysical channel. An apparatus for receiving the channel quality identification information bits at a base station of a split multiple access communication system, A demultiplexer for extracting coded bits from the channel quality identifier region and the fast pilot region of the subframe; Move the sixteenth and seventeenth base vectors from the base vector column of length 20 used when the high speed forward packet service is not supported to the positions of the first and second base vectors of the base vector column. And a decoder for decoding the extracted coded bits by the basis vector sequence generated by shifting the fifteenth basis vectors, and outputting the channel quality identification information bits. The transmission method of claim 1, wherein the codeword b _i having a length of 20 is output by the following Equation 4.

, i = 0, 1,... , 19 Here, a _n is a CQI information bit, i is a parameter for designating an arbitrary bit position among bits of an orthogonal code, and M _{i, n} is a code having a length of 20. The transmission method as claimed in claim 11, wherein the 15-bit encoded bits correspond to an output b _i by Equation 5 below.

, i = 0, 1,... , 14 Where a _n is a CQI information bit and M _{i, n} is a length 15 code. The transmitter of claim 3, wherein the codeword b _i having a length of 20 is output by the following Equation 6.

, i = 0, 1,... , 19 Here, a _n is a CQI information bit, i is a parameter for designating an arbitrary bit position among bits of an orthogonal code, and M _{i, n} is a code having a length of 20. The transmitting apparatus of claim 13, wherein the 15-bit encoded bits correspond to an output b _i by Equation 7 below.

, i = 0, 1,... , 14 Where a _n is a CQI information bit and M _{i, n} is a length 15 code. 8. The method of claim 7, wherein when the fast forward packet service is provided, fast pilot bits are placed in place of coded bits disposed in the fast pilot region.

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