KR100429526B1 - Data rate information transmitting/receiving method and device in a mobile communication system - Google Patents

Abstract

Disclosed are a method and apparatus for transmitting and receiving information indicating a data rate of data transmitted from a terminal to a base station in a mobile communication system supporting a multimedia service including voice and data services. According to the present invention, the terminal first receives the maximum data rate information to be used from the base station. The terminal then determines from the received maximum data rate information the number of data rate indication bits determined by the number of transmittable data rates less than or equal to the maximum data rate. The terminal then transmits information indicating the data rate of the terminal having the determined number of data rate indication bits.

Description

Method and device for transmitting and receiving data rate indication information of mobile communication system {DATA RATE INFORMATION TRANSMITTING / RECEIVING METHOD AND DEVICE IN A MOBILE COMMUNICATION SYSTEM}

The present invention relates to a mobile communication system supporting a multimedia service including voice and data services, and more particularly, to a method and apparatus for transmitting and receiving information indicating a transmission rate of data transmitted from a terminal to a base station.

A typical mobile communication system, for example, a code division multiple access (CDMA) mobile communication system such as IS-2000, only supports voice service. However, as communication technology has developed along with user demands, mobile communication systems have also been developed to support data services. For example, HDR (High Data Rate) is a mobile communication system proposed to support only high speed data services.

Existing mobile communication systems are considered to support only voice services or only data services. That is, although the mobile communication system needs to simultaneously service a voice service and a data service, the existing mobile communication system supports each service separately. Therefore, there is a demand for the implementation of a mobile communication system capable of supporting a voice service and at the same time a data service. Recently, a so-called " 1xEV-DV (Evolution Data and Voice) "

The mobile communication system such as 1xEV-DV not only transmits data from the base station to the terminal but also enables data transmission from the terminal to the base station. The so-called "SCH (Additional Channel)" is used for data transmission from the terminal of the mobile communication system to the base station, and the terminal transmits information indicating the transmission rate of the data transmitted to the base station.

1 is a view showing the configuration of a data rate indication information transmission apparatus according to the prior art. For example, FIG. 1 illustrates a structure of a reverse rate indicator channel (R-RICH) for transmitting data rate indication information from a terminal of a 1xEV-DV mobile communication system to a base station.

Referring to FIG. 1, a total of four or seven bits are allocated to an R-RICH sequence, which is data rate indication information, to indicate a data rate of data transmitted through a reverse SCH. The number of SCHs used in the corresponding terminal and the data rate for each SCH are input to the controller 101. The controller 101 receives the number of SCHs and determines a mapping relationship between an R-RICH sequence and a reverse SCH data rate. When the mapping relationship between the R-RICH sequence and the reverse SCH data rate is determined by the controller 101, a 4-bit or 7-bit R-RICH sequence is output according to the data rate input to the controller 101. When using one SCH, the terminal transmits a 4-bit R-RICH sequence, and when using two SCHs, the terminal transmits a 7-bit R-RICH sequence. The coding rate applied by the encoder 102 changes according to the number of bits allocated to the R-RICH sequence. When the 4-bit R-RICH sequence is transmitted, the code rate is R = 4/24. When the 7-bit R-RICH sequence is transmitted, the code rate is R = 7/24. The number of encoded symbols output from the encoder 102 is 24 in total regardless of the number of bits of the R-RICH sequence. The 24 encoded symbols output from the encoder 102 are repeated 16 times in the sequence repeater 103. The 384 (24 × 16) symbols output from the sequence repeater 103 are converted from binary form to “+1” or “-1” in the signal pointer mapper 104. The 384 symbols output from the signal converter 104 are spread to a particular Walsh code of length 64 assigned to the R-RICH in the Walsh spreader 105. The signal spread by the Walsh spreader 105 is transmitted to the base station in a reverse frame of 20 ms.

Table 1 below shows a mapping relationship between a reverse rate indicator channel (R-RICH) sequence and a reverse SCH data rate when one SCH is used for data transmission. In Table 1 below, each reverse data rate is listed in ascending order of size, and shows an example in which a 4-bit R-RICH sequence is allocated in order from "0000" to "1000".

Data Rate (kbps) R-RICH Sequence 0 0000 9.6 0001 19.2 0010 38.4 0011 76.8 0100 153.6 0101 307.2 0110 614.4 0111 1024 1000

2 is a diagram illustrating a processing flow of a call setup operation between a general base station and a terminal.

Referring to FIG. 2, call setup begins with the terminal powering on in step 201. In step 202, the powered-on terminal announces its existence to the wireless network by transmitting a mobile station registration and transmits various signaling related information related to the terminal to the base station. The information transmitted by the terminal is received by the base station, and the base station performs call setup for the terminal in step 203. In step 203, various control information (call setup parameters) necessary for the terminal to operate in the wireless network are determined. The control information determined at this time includes the number of SCHs to be used by the terminal and the maximum data rate for each SCH. The number of SCHs determined in step 203, the maximum data rate for each SCH, etc. are determined by comprehensively considering the type and characteristics of the corresponding terminal, the type of service to be used, and various wireless network related situations. The control information determined in step 203 is transmitted to the terminal in step 204, and the transmitted control information is received by the terminal in step 205. After receiving the control information in step 205, the terminal uses the same to start transmission of traffic data in step 206.

As described above, during call setup, the terminal receives various control information from the base station. At this time, the received control information includes the number of SCHs and the maximum transmission rate for each SCH. The terminal for R-RICH transmission according to the prior art illustrated in FIG. 1 may map the number of bits of an R-RICH sequence to be transmitted and a data rate (or a combination of data rates) in consideration of only the number of SCHs in the control information. Determine the relationship. That is, the maximum data rate for each SCH is not considered at all in determining the data rate, the number of R-RICH bits to be transmitted, and the mapping relationship. For example, when one SCH is used for data transmission, any one of the data rates shown in Table 1 and the corresponding R-RICH bit regardless of the maximum data rate of the SCH is corresponding. The mapping relationship between numbers is applied. As shown in FIG. 2, the maximum data rate for each SCH can be notified to the terminal using a signaling message when setting up a call, and can be reset using the signaling message even after the call starts.

The problem with the R-RICH bit determination scheme applied in FIG. 1 is that a certain number of bits is allocated to the R-RICH sequence even when the number of data rates of the SCH that can be transmitted is limited by the maximum rate of the SCH. For example, if only one SCH is used and the maximum data rate is set to 38.4 kbps in Table 1, the terminal transmits data only at a data rate equal to or lower than 38.4 kbps. Accordingly, when the conventional technique is applied, the sequence of the R-RICH is determined and transmitted as one of "0000", "0001", "0010", and "0011". That is, when one SCH is used for data transmission and the maximum data rate is 38.4 kbps, four data rates can be transmitted and the number of bits of the R-RICH sequence is four. In fact, the four data rates can be represented by two bits, but two bits carry more four bits. Even though it is possible to transmit only two bits of information in this manner, transmitting four bits of information is applied to 4/24 even though the encoder 102 can apply a coding rate of 2/24. In general, if the code rate is lowered by reducing the number of bits of the R-RICH sequence while maintaining the same number of codeword symbols, the transmission power required for obtaining constant performance is reduced by increasing the minimum distance of the block code. . However, since the prior art as described above transmits 4 bits when only 2 bits can be transmitted, unnecessary information is transmitted, thereby causing performance degradation or unnecessary transmission power.

Accordingly, an object of the present invention is to provide a method and apparatus for transmitting and receiving information indicating a transmission rate of data transmitted from a terminal to a base station in a mobile communication system for voice and packet data services.

Another object of the present invention is to provide a method and apparatus for minimizing the number of bits of information indicating a reverse data rate according to the amount of transmission information in a mobile communication system for voice and packet data services.

Another object of the present invention is to provide a method and apparatus for improving performance by enabling a code rate to be lowered according to the amount of transmission information when encoding information indicating a reverse data rate in a mobile communication system for voice and packet data services. have.

The present invention for achieving these objects is to generate information indicating the data rate of the data transmitted from the terminal of the mobile communication system to the base station, the terminal first receives the maximum data rate information required to use from the base station . The terminal then determines from the received maximum data rate information the number of data rate indication bits determined by the number of transmittable data rates less than or equal to the maximum data rate. The terminal then transmits information indicating the data rate of the terminal having the determined number of data rate indication bits.

1 is a diagram showing the configuration of a data rate indication information transmitting apparatus according to the prior art;

2 is a diagram illustrating a processing flow of a call setup operation between a general base station and a terminal.

3 is a diagram showing the configuration of a data rate indication information transmitting apparatus according to an embodiment of the present invention.

4 is a flowchart illustrating a process for receiving data rate indication information at a base station according to an embodiment of the present invention.

5 is a diagram illustrating a processing flow of data rate indication information generation and transmission operation in a terminal according to an embodiment of the present invention.

6 is a diagram illustrating a configuration of an apparatus for receiving data rate indication information according to an embodiment of the present invention.

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings. It should be noted that reference numerals and like elements among the drawings are denoted by the same reference numerals and symbols as much as possible even though they are shown in different drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

3 is a diagram illustrating a configuration of an apparatus for transmitting data rate indication information according to an embodiment of the present invention. This embodiment shows a transmission channel structure of a reverse rate indicator channel (R-RICH) according to an embodiment of the present invention for indicating a transmission rate of this transmission data when transmitting data from a terminal of a 1xEV-DV system to a base station.

The reverse rate indicator channel (R-RICH), which is addressed in the present invention, is a channel transmitted in the reverse direction and performs a function of transmitting a data rate of a supplemental channel (SCH) transmitted from a terminal to a base station. The base station restores the R-RICH of each terminal received in the reverse direction, and infers the information on the presence or absence of data transmitted from the corresponding terminal to the supplemental channel (SCH), data amount, modulation scheme, channel coding scheme, and the like. Restore it. The R-RICH transmission / reception method proposed by the present invention can be applied to other systems in addition to the 1xEV-DV system. Referring to FIG. 3, according to an embodiment of the present invention. The apparatus for transmitting data rate indication information transmits maximum data rate information to be used by a terminal from a base station to the terminal, and receives information indicating the data rate of the terminal in a mobile communication system that receives the maximum data rate information at the terminal. It is for transmitting to the base station. The controller 301 selects the number of transmittable data rates less than or equal to the maximum data rate from the received maximum data rate information from a memory (table 306 or 307) storing a series of data rates. The controller 301 then determines the number of data rate indication bits determined by the number of selected data rates. The number of data rate indication bits is represented by a minimum integer determined by the number of selected data rates. In addition, the controller 301 performs an operation of mapping information indicating a data rate having the data rate indication bit number to each of the transmittable data rates. That is, the controller 301 determines the number of data rate indication bits determined by the number of transmittable data rates less than or equal to the received maximum data rate. In this case, the relationship between the number of selected data rates and the number of data rate indication bits is determined as in Equation 1 below. A transmitter including an encoder 302, a sequence repeater 303, a signal converter 304, and a spreader 305 transmits information indicating the data rate of the terminal having the determined number of data rate indication bits. In this case, the encoder 302 encodes information indicating a data rate corresponding to a code rate determined by the determined number of data rate indication bits and outputs the information for transmission. The information indicating the data rate is transmitted every time data is transmitted from the terminal to the base station. Although not shown in the drawing, in addition to the components shown in FIG. 3, the terminal apparatus according to the embodiment of the present invention is configured to receive a maximum data rate of each SCH and the number of SCHs notified after being determined by the base station. Note that it further includes.

In FIG. 3, a total k-bit R-RICH sequence is used to indicate the data rate of the reverse SCH. The number of SCHs used in the corresponding terminal and the maximum data rate for each SCH are input to the controller 301. The controller 301 receives a number of SCHs and a maximum data rate for each SCH to determine a mapping relationship between an R-RICH sequence to be used and a reverse SCH data rate. Tables 306 and 307 each store a series of data rate and data rate combinations applied to one and two SCHs. The number of bits of the R-RICH sequence to be transmitted is determined by the number of SCHs and the maximum data rate for each SCH. As an example, if one SCH is used and the maximum data rate is determined to be 38.4 kbps in Table 1, since there are four types of data rates that can be transmitted, the number of bits of the R-RICH to be transmitted is determined to be two. If the number of bits transmitted to the R-RICH is k and the data rate of the SCH that can be transmitted is m, there is a relation between k and m as shown in Equation 1 below.

In Equation 1, m is the number of transmittable data rates less than or equal to the maximum data rate among a series of data rates, k is the number of data rate indication bits, Is the minimum integer greater than or equal to a.

Equation 1 may be commonly applied to one SCH and two SCHs. In the case of one SCH, m is the number of data rates that can be transmitted to one SCH. In the case of two SCHs, in Equation 1, m is the number of combinations of data rates available in two SCHs. For example, if there are two SCHs and the maximum data rate of the first SCH is 9.6 kbps and the maximum data rate of the second SCH is 38.4 kbps in Table 1, the number of possible combinations is 8 (the number of indexes for the first SCH is 2 × 2 SCH). Since the number of branches is 4), m = 8 and k = 3 in Equation 1 above.

In FIG. 3, adjusting the number of bits of the R-RICH sequence according to Equation 1 reduces performance by reducing the code rate of the R-RICH by minimizing the number of bits of the R-RICH sequence according to the amount of information to be transmitted. To improve. The bits of the R-RICH sequence output from the controller 301 applied in FIG. 3 are encoded and transmitted at a code rate R = k / n (eg n = 24) by the encoder 302. The difference from FIG. 1 is that since the number of R-RICH bits is determined by the maximum data rate and the number of SCHs, the value of k is possible from 1 to 7. The encoder 302 operates at a code rate of k / n (eg n = 24) to encode the number of corresponding R-RICH bits. The 24 encoded symbols output from the encoder 302 are repeated a predetermined number of times (eg, 16 times) by the sequence repeater 303. The 384 symbols output from the sequence repeater 303 are converted from binary form to "+1" or "-1" in the signal converter 304. The 384 symbols output from the signal converter 304 are spread by a Walsh spreader 305 into a particular Walsh code of a particular length (eg, 64) assigned to the R-RICH. The signal spread by the Walsh spreader 305 is carried in a reverse frame of 20 ms. An orthogonal spreader for orthogonally spreading a symbol output from the signal converter 304 using an orthogonal code in place of the Walsh spreader 305 may be used.

The difference between the embodiment of the present invention illustrated in FIG. 3 and the prior art illustrated in FIG. 1 is largely classified into two types. First, the number of bits of the R-RICH sequence is determined by the number of R-SCHs in the case of FIG. 1, whereas in the case of FIG. 3, the number of data rates that can be transmitted in one R-SCH or two R-SCHs. It is determined by the number of data rate combinations that can be transmitted. Second, in the case of FIG. 1, a mapping relationship between an R-RICH sequence and a specific data rate or data rate combination is always fixed, and when the number of R-SCHs is determined, a corresponding mapping relationship is a data rate or a transmittable data rate. It is independent of the number of possible data rate combinations. On the other hand, in the case of FIG. 3, the mapping relationship between a specific data rate or a combination of data rates is changed accordingly when the number of transmittable data rates or a combination of transmittable data rates changes. That is, in an embodiment of the present invention, the mapping relationship between the number of bits of the R-RICH sequence, the combination of the R-RICH sequence and the transmittable data rate or transmittable data rate is variable.

6 is a diagram illustrating a configuration of an apparatus for receiving data rate indication information according to an embodiment of the present invention. This embodiment shows a structure of a channel receiver of a reverse rate indicator channel (R-RICH). Referring to FIG. 6, the received signal is input to the Walsh despreader 601 after PN despreading. The Walsh despread signal adds the repeated sequence by a preset number (eg, 16 times) by the sequence compensator 603 after channel compensation in the channel compensator 602. The signal output from the sequence summer 603 is input to the decoder 604. The code rate in the decoder 604 is R = k / n (eg n = 24), where the value of k is determined by the controller 605. The controller 605 receives the number of SCHs used in the corresponding terminal and the maximum data rate for each SCH to determine the number of bits k of the R-RICH sequence. The controller 605 receives the number of SCHs and the maximum data rate for each SCH to determine a mapping relationship between the R-RICH sequence and the reverse SCH data rate to be used. Tables 606 and 607 are storage media that store a series of data rate and data rate combinations applied to one and two SCHs, respectively. 3 and 6, the terminal and the base station may make the mapping of the R-RICH sequence and the combination of the data rate and the data rate identical by applying the same scheme. The base station apparatus shown in FIG. A mobile communication system including a terminal for transmitting data to a base station, for receiving information indicating a transmission rate of data transmitted from the terminal to the base station. The controller 605 selects a number of data rates less than or equal to the maximum data rate to be used by the terminal from a memory (table 606 or 607) storing a series of data rates, and is determined by the number of selected data rates. The number of data rate indication bits is determined. The number of selected data rates is m, and the number of data rate indication bits k is determined as in Equation 1 mentioned above. That is, the controller 605 determines the number of data rate indication bits determined by the number of data rates less than or equal to the maximum data rate to be used by the terminal. In addition, the controller 605 maps information indicating a data rate having the data rate indication bit number to each of the data rates. A receiver including a despreader 601, a channel compensator 602, a sequence adder 603, and a decoder 604 is configured to determine the received information by the determined number of data rate indication bits when information indicating the data rate is received from the terminal. Although not shown in the drawings, the base station apparatus according to an embodiment of the present invention includes a receiver configuration for receiving a registration message from a terminal, the number of SCHs, and each of the SCHs. It should be noted that the transmitter further includes a transmitter configuration for determining a maximum data rate of the SCH and notifying the terminal of the SCH.

Table 2 below shows the mapping of the data rate and the R-RICH sequence when the present invention is applied when one SCH is used for data transmission.

SCH data rate Whether data rate is used R-RICH sequence (conventional method) R-RICH Sequence (Suggested Method) 0 kbps use 000 00 Data rate A use 001 01 Data rate B use 010 10 Data rate C use 011 11 Data rate D Do not use 100 - Data rate E Do not use 101 - Data rate F Do not use 110 - Data rate G Do not use 111 -

The first column of Table 2 above lists all possible data rates of the SCH. That is, in Table 2, it is assumed for a total of eight data rates up to the data rate G, including the case where the data rate of the R-SCH is 0 kbps. In addition, the maximum data rate of the SCH is assumed to be the data rate C. Any method of enumerating the data rate may be applied, but it must satisfy the condition that both the base station and the terminal should be applied equally. In Table 1, it is assumed that they are listed in ascending order. The second column shows whether each data rate is used. The third column is the result of mapping the R-RICH sequence to the SCH data rate when using the conventional scheme. In the conventional method, since the maximum data rate is the data rate C, four data rates are possible, but three bits are used for the R-RICH sequence. In contrast, the method proposed in the present invention first calculates the number of data rates that can be transmitted. In Table 2, the number of data rates that can be transmitted is four. When the above Equation 1 is applied, the number of bits of the R-RICH sequence is calculated to be two. The fourth column of Table 2 maps the R-RICH sequence and the transmittable data rate. The mapping relationship between the data rate and the R-RICH sequence may be applied to any method, but the base station and the terminal must satisfy the same condition. In Table 2, the R-RICH sequences are listed in order of the data rates that can be transmitted.

In Table 2, the determination of the R-RICH sequence and the mapping setting with the transmittable data rate are variably applied according to the maximum data rate. When the maximum data rate is set to data rate C, a 2-bit R-RICH sequence is mapped to each transmittable data rate. In the actual wireless communication system, the maximum data rate may be determined during call setup or may be changed after call initiation. When applying the method proposed in the present invention, the number of bits of each R-RICH sequence and each R-RICH sequence according to the maximum data rate And a mapping between the transmittable data rates is determined.

Table 3 below shows the mapping of the data rate and the R-RICH sequence when the present invention is applied when two SCHs are used for data transmission.

SCH 1 data rate SCH 2 data rate Whether data rate is used R-RICH sequence (conventional method) R-RICH Sequence (Suggested Method) 0 kbps 0 kbps use 0000 000 0 kbps Data rate A use 0001 001 0 kbps Data rate B Do not use 0010 - 0 kbps Data rate C Do not use 0011 - Data rate A 0 kbps use 0100 010 Data rate A Data rate A use 0101 011 Data rate A Data rate B Do not use 0110 - Data rate A Data rate C Do not use 0111 - Data rate B 0 kbps use 1000 100 Data rate B Data rate A use 1001 101 Data rate B Data rate B Do not use 1010 - Data rate B Data rate C Do not use 1011 - Data rate C 0 kbps use 1100 110 Data rate C Data rate A use 1101 111 Data rate C Data rate B Do not use 1110 - Data rate C Data rate C Do not use 1111 -

The first and second columns of Table 3 list all transmittable data rates of SCH1 and SCH2. In determining all data rates that can be transmitted in an actual 1xEV-DV system, the Walsh code and modulation scheme used in each SCH must also be considered. If orthogonality cannot be maintained due to the Walsh codes and modulation schemes used in SCH1 and SCH2, the corresponding rate combination is impossible to transmit and should be excluded from Table 3.

In Table 3, four data rates are assumed for SCH1 and SCH2, including the case where the transmission rate is 0 kbps. In addition, the maximum data rate of SCH1 is assumed to be the data rate C, and the maximum data rate of SCH2 is assumed to be the data rate A. Any method of enumerating the data rate may be applied, but it must satisfy the condition that both the base station and the terminal should be applied equally. The third column shows the use of each data rate combination. The fourth column is the result of mapping the R-RICH sequence to the SCH data rate in the conventional method. In the conventional method, four data rates are available for SCH1 and two data rates are available for SCH2, so a total of eight data rates can be combined. Since the number of data rates is assumed to be four, the number of data rate combinations of SCH1 and SCH2 is 16. Therefore, a total of four R-RICH sequences are used for transmission. In contrast, the method proposed in the present invention first calculates the number of data rates that can be transmitted. In Table 3, the number of data rates that can be transmitted is eight. When the above Equation 1 is applied, the number of bits of the R-RICH sequence is calculated to be three. The fourth column of Table 3 maps the R-RICH sequence and the transmittable data rate combination. The mapping relationship between the data rate combination and the R-RICH sequence may be any method, but the base station and the terminal must satisfy the same condition. In Table 3, the R-RICH sequences are listed in order of transmission rate combination.

In Table 3, the determination of the R-RICH sequence and the mapping setting to the transmittable data rate are variably applied according to the maximum data rate. In the actual wireless communication system, the maximum data rate may be determined during call setup or may be changed after call initiation.In the case of applying the method proposed in the present invention, the number of bits of each R-RICH sequence and each R-RICH sequence according to the maximum data rate And a mapping between the transmittable data rates is determined.

Tables 306 and 307 of FIG. 3 store the first column of <Table 2> and the first and second columns of <Table 3>, respectively. The controller 301 calculates the number of bits of the R-RICH sequence after calculating the number of data rates or a combination of data rates in consideration of the number of SCHs and data rates for each SCH. The controller 301 assigns an R-RICH sequence to a series of data rates or data rate combinations stored in storage 306 or storage 307. The number of bits of the allocated R-RICH sequence is determined by the controller 301.

4 is a flowchart illustrating a process for receiving data rate indication information at a base station according to an embodiment of the present invention. This figure is a flowchart illustrating a method of determining the number of bits of an R-RICH sequence and mapping a data rate of an R-RICH sequence and an SCH in a base station according to an embodiment of the present invention. This flow is performed by the apparatus shown in FIG. 6, in particular the controller 605.

Referring to FIG. 4, in step 401, the base station receives a mobile registration message from the terminal. The terminal registration message includes various terminal related information such as the type of terminal required for the terminal to be serviced in the wireless network and the type of request service. In step 402, the base station determines control information such as the number of SCHs to be used by the terminal, data rate of each SCH, and the like using various information received from the terminal and other information held by the base station. The determined control information is transmitted to the terminal in step 403 using the SCH assignment message.

If the number of SCHs is one, the transmittable data rate of the corresponding terminal is determined in step 405 through step 404. The transmittable data rate of the corresponding terminal is determined by applying a restriction that, when one SCH is transmitted, all transmittable data rates must be equal to or smaller than the maximum data rate. For example, in Table 2, data rates that can be transmitted in one SCH are 0 kbps and 8 data rates A to G. When the maximum data rate C is applied to the data rates that can be transmitted in one SCH, the data rates that can be transmitted by the terminal are 0 kbps and four data rates A to C. The minimum number of bits (data rate indication bits) of the R-RICH sequence required in step 406 is calculated using the number of data rates that can be transmitted in the SCH of the terminal determined in step 405. The number of data rate indication bits of the required R-RICH sequence is determined by Equation 1 above. In the case of Table 2, the number of data rate indication bits of the required R-RICH sequence is two. In step 407, the R-RICH sequence having the number of bits calculated in step 406 is mapped to data rates that can be transmitted in the SCH of the corresponding terminal.

In the case of Table 2, there are four data rates that can be transmitted from the corresponding terminal, and a total of 2 bits of R-RICH sequences are required to represent each. R-RICH sequences 00, 01, 10, and 11 are mapped to 0 kbps, data rate A, data rate B, and data rate C, which are data rates that the terminal can transmit. In Table 2, the data rates are listed in ascending order, and the R-RICH sequence is applied in the order of 00 to 11, but any method may be applied as long as it is a preset method between the base station and the terminal.

If the number of SCHs is two, a combination of transmittable data rates of the corresponding terminal is determined in step 408 through step 404. The transmittable data rate combination of the corresponding terminal is determined by applying a restriction that, when two SCHs are transmitted, all transmittable data rate combinations must be equal to or smaller than the maximum data rate. For example, in Table 3, 16 data rates can be transmitted in two SCHs. When the maximum data rate in each SCH is called data rate C and data rate A, there are eight combinations of data rates that can be transmitted by the corresponding terminal. The number of data rate indication bits of the R-RICH sequence required in step 409 is calculated using the number of data rate combinations that can be transmitted in SCH1 and SCH2 of the corresponding UE in step 408. The number of data rate indication bits of the required R-RICH sequence is determined by Equation 1 above. In the case of Table 3, the number of data rate indication bits of the required R-RICH sequence is three. In step 410, the R-RICH sequence having the number of bits calculated in step 409 is mapped to the data rate combinations that can be transmitted in the SCH of the terminal.

In the case of Table 3, there are 8 data rates that can be transmitted from the corresponding terminal, and a total of 3 bits of R-RICH sequences are required to represent each. The data rate that can be transmitted by the terminal is a combination of data rates indicated in the third column of Table 3. Each data rate combination mapped an R-RICH sequence from 000 to 111. The mapping scheme of the data rate combination and the R-RICH sequence may be any scheme as long as it is a preset scheme between the base station and the terminal.

After the R-RICH mapping in the process 407 or 410 is completed, in step 411, a code rate to be used in the encoder 302 of the terminal shown in FIG. 3 is determined. The code rate is determined by the number of bits of the R-RICH sequence calculated in step 406 or 409. The code rate determined in step 411 is used in the decoding operation in the decoder 604 of the base station shown in FIG. That is, the decoder 604 uses the determined code rate R = k / n when receiving and decoding R-RICH in the reverse direction.

5 is a diagram illustrating a processing flow of data rate indication information generation and transmission operation in a terminal according to an embodiment of the present invention. This figure is a flowchart illustrating a method of determining the number of R-RICH bits and mapping the data rates of R-RICH bits and SCHs in a terminal according to an embodiment of the present invention. This flow is performed by the apparatus shown in FIG. 3, in particular the controller 301.

Referring to FIG. 5, in step 501, a terminal receives an SCH assignment message from a base station. The SCH assignment message includes control information such as the number of SCHs to be used by the corresponding terminal and the data rate of each SCH.

If the number of SCHs is one, the data transmission rate of the corresponding terminal is determined in step 503 through step 502. The transmittable data rate of the corresponding terminal is determined by applying a restriction that, when one SCH is transmitted, all transmittable data rates must be equal to or smaller than the maximum data rate. The minimum number of bits (data rate indication bits) of the R-RICH sequence required in step 504 is calculated using the number of data rates that can be transmitted in the SCH of the corresponding terminal determined in step 503. The minimum number of bits of the required R-RICH sequence is determined by Equation 1 above. In step 505, the R-RICH sequence having the number of bits calculated in step 504 is mapped to data rates that can be transmitted in the SCH of the corresponding terminal.

If the number of SCHs is two, a combination of transmittable data rates of the corresponding terminal is determined in step 506 in step 502. The transmittable data rate combination of the corresponding terminal is determined by applying a restriction that, when two SCHs are transmitted, all transmittable data rate combinations must be equal to or smaller than the maximum data rate. The minimum number of bits of the R-RICH sequence required in step 507 is calculated using the number of data rate combinations that can be transmitted in SCH1 and SCH2 of the corresponding terminal determined in step 506. The minimum number of bits of the required R-RICH sequence is determined by Equation 1 above. In step 508, the R-RICH sequence having the number of bits calculated in step 507 is mapped to data rate combinations that can be transmitted in the SCH of the terminal.

After the R-RICH mapping in step 505 or step 508 is completed, step 509 determines the code rate to be used in the encoder 302 of the terminal shown in FIG. The code rate is determined by the number of bits of the R-RICH sequence calculated in step 504 or step 507. After the code rate is determined in step 509, the terminal encodes and transmits the corresponding R-RICH sequence at the determined code rate whenever the SCH is transmitted in the reverse direction.

The method of mapping the combination of the SCH data rate or the SCH data rate and the R-RICH sequence described with reference to FIGS. 4 and 5 may be applied in addition to the methods used in Tables 2 and 3. Conditions that must satisfy the method of mapping the SCH data rate or the combination of the SCH data rate and the R-RICH sequence are obtained by the base station and the terminal in common according to the given number of SCHs and the maximum data rate for each SCH to obtain the same mapping relationship. There is something that should be possible.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. For example, the flowcharts of FIG. 4 and FIG. 5 correspond to the case where the number of SCHs is one or two, but the same may be applied to the case where the number of SCHs is three or more. Even when the number of SCHs is three or more, a data rate that can be transmitted is obtained, and the maximum data rate for each SCH is applied to obtain the number of data rate combinations of the corresponding terminals. Next, the number of bits of the required R-RICH is obtained, and the data rate combination and the R-RICH sequence are mapped. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention proposes a new channel structure for transmitting data rate indication information for a data rate or a combination of data rates transmitted from a terminal of a mobile communication system to a base station. The present invention improves the disadvantage of unnecessarily allocating a large number of bits to the data rate indication information and transmitting it in a situation in which a conventional data rate is limited to the number of data rates that can be transmitted by the maximum data rate. By allocating and transmitting the rate indication information, there is an advantage that the code rate can be lowered as a result. By lowering the code rate in this way, there is an advantage that the performance can be improved in the transmission of the data rate indication information.

Claims (21)

In the mobile communication system for receiving by the terminal the maximum data rate information to be used by the terminal from the base station, the method for generating information indicating the data rate of the terminal in the terminal, Selecting the number of transmittable data rates less than or equal to the maximum data rate from the received maximum data rate information; Determining a number of data rate indication bits determined by the number of selected data rates; And generating data rate indication information that is one-to-one mapped with the data rate of the terminal with the determined number of data rate indication bits. The method of claim 1, wherein the determining of the number of data rate indication bits comprises: Selecting a number of transmittable data rates from a series of data rates that is less than or equal to the maximum data rate; Determining the minimum number of bits determined by the number of selected data rates, When the number of selected data rates is m, the data rate indication bit number k is Said method being determined by a minimum integer greater than or equal to. In the mobile communication system comprising a base station and a terminal for transmitting data to the base station, the method for receiving information indicating the transmission rate of the data transmitted from the terminal to the base station in the base station, Determining the number of data rates less than or equal to the maximum data rate from the maximum data rate information to be used by the terminal; Determining a number of data rate indication bits determined by the number of selected data rates; And generating information indicating a data rate mapped one-to-one with the data rate of the terminal with the determined number of data rate indication bits. 4. The method of claim 3, further comprising decoding the received information at a code rate determined by the determined minimum number of bits when information indicating a data rate is received from the terminal. The method of claim 4, wherein the determining of the number of data rate indication bits comprises: Selecting a number of data rates from a series of data rates that is less than or equal to a maximum data rate to be used by the terminal; Determining the minimum number of bits determined by the number of selected data rates, When the number of selected data rates is m, the data rate indication bit number k is Said method being determined by a minimum integer greater than or equal to. Repeating the encoded rate indication information a predetermined number of times; And performing orthogonal spreading on the repeated rate indication information. The method of claim 5, Generating information indicating a data rate mapped one-to-one with the data rate with the number of data rate indication bits at each of the data rates; And when the information indicating the data rate is received from the terminal, decoding the received information at a code rate determined by the number of data rate indication bits corresponding to the mapped data rate information. Way. In the mobile communication system for receiving by the terminal the maximum data rate information to be used by the terminal from the base station, the terminal device for generating information indicating the data rate of the terminal, A memory storing transmittable data rates less than or equal to the maximum data rate from the received maximum data rate information; And a controller for determining a data rate indication bit number determined by the number of transmittable data rates and for mapping the information indicating the data rate of the terminal with the determined number of data rate bits. 8. The data rate indication bit number k according to claim 7, wherein when the number of transmittable data rates is m, Said device as determined by a minimum integer greater than or equal to. The number of channels and the maximum data rate are determined at call setup. The apparatus of claim 7, further comprising a transmitter for transmitting information indicating a data rate of the terminal. In the mobile communication system comprising a base station and a terminal for transmitting data to the base station, the base station apparatus for receiving information indicating a transmission rate of data transmitted from the terminal to the base station, A controller for determining the number of data rate indication bits determined by the number of data rates less than or equal to the maximum data rate to be used by the terminal; And a decoder for decoding the received information at a code rate determined by the determined number of data rate indication bits when information indicating a data rate is received from the terminal. 11. The apparatus of claim 10, wherein the controller selects the number of data rates less than or equal to the maximum data rate among a series of data rates, and selects the number of data rate indication bits determined by the number of selected data rates. Determining the device. 12. The data rate indication bit number k according to claim 11, wherein when the number of selected data rates is m, Said device as determined by a minimum integer greater than or equal to. 12. The apparatus of claim 11, further comprising a memory for storing the series of data rates. 12. The apparatus of claim 11, wherein the controller is further configured to map information indicating a data rate having the data rate indication bit number to each of the data rates. A mobile communication system comprising a base station and a terminal for transmitting data to the base station, the method for transmitting and receiving information indicating a transmission rate of data transmitted from the terminal to the base station, Transmitting, by the base station, maximum data rate information to be used by the terminal to the terminal; Determining, at the terminal, a first data rate indication bit number determined by the number of transmittable data rates less than or equal to the received maximum data rate; Transmitting, by the terminal, information indicating a data rate of the terminal having the determined number of first data rate indication bits to the base station; Determining, at the base station, a second data rate indication bit number determined by the number of data rates less than or equal to the maximum data rate; And when the base station receives information indicating a data rate from the terminal, decoding the received information at a code rate determined by the determined number of second data rate indication bits. The method of claim 15, wherein the determining of the number of first data rate indication bits comprises: Selecting a number of transmittable data rates from a series of data rates that is less than or equal to the maximum data rate; Determining the number of first data rate indication bits determined by the number of selected data rates, When the number of selected data rates is m, the first data rate indication bit number k is Said method being determined by a minimum integer greater than or equal to. The method of claim 16, further comprising: generating information indicating a data rate mapped one-to-one with the data rate of the terminal with the first data rate indication bit number in each of the transmittable data rates; Selecting one of the data rates mapped to the data rate indication bits; And encoding information indicating the selected data rate at a code rate determined by the number of data rate indication bits and outputting the same for transmission. The method of claim 17, wherein the determining of the number of second data rate indication bits comprises: Selecting a number of data rates from the series of data rates that is less than or equal to the maximum data rate; Determining the number of second data rate indication bits determined by the number of selected data rates, When the number of selected data rates is m, the second data rate indication bit number k is Said method being determined by a minimum integer greater than or equal to. 19. The method of claim 18, further comprising generating information indicating a data rate mapped one-to-one with the data rate of the terminal with the number of second data rate indication bits in each of the data rates. Way. The method of claim 2, Generating information indicating a data rate mapped one-to-one with the data rate of the terminal with the number of data rate indication bits in each of the transmittable data rates; Selecting one of data rates mapped to the data rate indication bits; And encoding information indicating the selected data rate at a code rate determined by the number of data rate indication bits and outputting the same for transmission. 10. The apparatus of claim 9, wherein the transmitter comprises an encoder that encodes information indicating a data rate of the terminal and outputs the data for transmission by using a code rate determined by the determined number of data rate indication bits. Device.