KR20050055166A - Apparatus and method for controlling data rate in a mobile communication system - Google Patents

Abstract

The present invention relates to an apparatus and method for providing a reverse data rate in a mobile communication system providing two different services.

The method according to the present invention is a method for determining the rate of reverse traffic using the pilot power rate value received in the forward direction in a mobile communication system capable of transmitting two different data in the reverse direction. When receiving a rate value, selecting a table to which the received pilot power ratio value is applied from the size of the encoded packet according to the pilot power ratio and the transmission rate table having different values received in advance and the rate table; Transmitting an encoded packet by setting one entry among values smaller than the allowed traffic-to-pilot power rate value in a table, and when the entry of the transmitted encoded packet is smaller than the allowed-to-traffic pilot power rate value, Pilot to traffic of the transmitted entry And updating the allowed value with the power factor value.

Description

Apparatus and method for controlling data rate in mobile communication system {APPARATUS AND METHOD FOR CONTROLLING DATA RATE IN A MOBILE COMMUNICATION SYSTEM}

The present invention relates to an apparatus and method for controlling a data rate in a mobile communication system, and more particularly, to an apparatus and method for controlling a reverse data rate from a mobile station to a base station.

In general, a mobile communication system providing a data service includes a packet data channel for transmitting packet data. When transmitting data in such a packet data channel, the data rate is determined by various factors such as the channel condition between the mobile station and the base station, the total system capacity, the amount of peripheral interference, the distance between the mobile station and the base station, and the amount of data to be transmitted. In addition, data transmission is generally classified into forward data transmission from the base station to the mobile station and reverse transmission from the mobile station to the base station. Therefore, the forward data rate refers to the transmission rate of the packet data channel transmitted from the base station to the mobile station, and the reverse data rate refers to the transmission rate of the packet data channel transmitted from the mobile station to the base station.

Now, a method of controlling the reverse data rate in the current synchronous code division multiple access (CDMA) mobile communication system will be described. When transmitting packet data in the reverse direction in the CDMA mobile communication system to date, the transmitted data is transmitted in units of physical layer packets (PLPs). The data rate of each physical layer packet is variable every packet, and in general, the determination of the data rate is performed by the base station. That is, the base station controls the transmission rate of the various mobile stations communicating with the base station. As such, the process of determining and controlling the data rate of the mobile station by the base station is called scheduling. The scheduling is performed by receiving information on the power of the mobile station, the amount of data transmitted by the mobile station, etc. from the corresponding mobile station and performing scheduling based on the information. Such scheduling is an operation performed by a scheduler of a base station. The scheduler of a base station is called 'Rise of Thermal (Rise of Thermal)' or 'Receive Signal-to-Noise Ratio' of a mobile station belonging to the current base station (Base Transceiver station: "BTS"). Scheduling is performed taking into consideration the load obtained from the system.

The base station controls the reverse data rate of the mobile station in accordance with the transmission method of the base station control information Dedicated Rate Control (hereinafter referred to as "DRC") and Common Rate Control (hereinafter referred to as "CRC") It can be divided into). The base station operating in DRC transmits different rate control information for each terminal belonging to the base station. On the other hand, the base station operating in CRC delivers common rate control information for all terminals in the base station. That is, since the base station operating in the DRC transmits control information to all terminals in the cell, the base station has a merit in that the transmission rate can be controlled more precisely than the CRC, and more control information needs to be transmitted.

Next, the case of operating as a CRC and a case of operating as a DRC will be described. First, the case of operating in the CRC mode will be described. The base station operating in the CRC mode transmits control information indicating that the uplink transmission state is 'Busy' for all terminals in the cell when the RoT value measured by the base station exceeds a predetermined limit value. On the other hand, if the RoT value measured by the base station does not reach the limit value, the base station transmits control information indicating that the uplink transmission state is 'Not Busy' for all terminals in the cell. Then, the terminal receiving the control information indicating the 'busy' state can lower the RoT level in the cell by lowering its data rate or the TPR described below, and the terminal receiving the control information indicating the 'Not Busy' state You can increase your data rate or TPR. Such 'Busy' and 'Not Busy' information can be transmitted through one bit of Rate Control Bit (RCB).

Next, the case of operating in the DRC mode will be described. The base station operating in the DRC mode controls the reverse data rate of the mobile station based on the full rate transition and the limited rate transition method depending on the degree of transition of the reverse data rate of the mobile station. It can be divided into

The full rate transition method is a method in which the base station does not limit the transition of the data rate in controlling the reverse data rate of the mobile station. The limited rate transition method is a method in which the base station limits the transition of the data rate in one step in controlling the reverse data rate of the mobile station.

For example, a possible set of data rates include 9.6 kbps, 19.2 kbps, 38.4 kbps, 76.8 kbps, 153.6 kbps, 307.2 kbps and the like. Assume kpbs. Here, the number and specific values of data rates included in the data rate set may vary from system to system. In this case, in the full rate variation scheme, the base station can make all data rates in determining the data rate of the next packet for the mobile station. That is, the system allows the transmission rate of the terminal, which has been transmitted at 9.6 kbps, to be changed at 307.2 kbps at one time. The reverse rate of the terminal that the base station can tolerate is not limited by the previous transmission rate of the terminal. On the other hand, in the rate variation method, the base station limits the range of one step up or down from the previous packet rate in determining the data rate of the next packet of the terminal. For example, the rate control of the next packet of the base station for the terminal transmitting at 76.8 kbps is limited to one of 38.4 kbps, 76.8 kbps, 153.6 kbps. In other words, one step up, one step down, or sustain at the current rate of 76.8kbps is a way to limit the change in the data rate of the mobile station. The one step up, one step down, or maintenance command may be transmitted in the form of 'UP', 'DOWN', 'HOLD', respectively, and signals of '+1', '-1', and '0', respectively. Mapping can be done.

The overall rate variation method and the limit rate variation method have advantages and disadvantages, respectively. The full rate variation method has the advantage that there is no limit in determining the data rate of the mobile station, while the disadvantage is that many bits are required to transmit the scheduling result to the mobile station. For example, if there are six data rates as described above, three bits are required to express all data rates, and thus, a large amount of information must be transmitted because information such as an identifier of each terminal needs to be transmitted. will be. In addition, a drawback of the overall rate scheme is that a significant change in the amount of interference affecting another cell is caused by a significant change in the data rate of a specific terminal. As a result, due to such an interference, the channel change of terminals belonging to other cells is severe, which may adversely affect the system.

On the other hand, the limiting rate variation method has a disadvantage in that the base station is limited to one step change in determining the data rate of the mobile station. However, the rate variation method has an advantage of being able to transmit one bit in transmitting the scheduling result. In other words, the overhead is small. In addition, the limiting rate variation method has an advantage that the change in the amount of interference to other cells is relatively small by limiting the data rate change of the mobile station in one step.

On the other hand, in some systems, as described above, instead of the base station controlling the data rate of the terminal, there is also a system in which the base station controls the traffic to pilot power ratio (TPR) of the terminal. In a typical mobile communication system, the reverse transmission of the terminal is power controlled by the base station. In the power control process, the terminal receives a power control command from the base station to directly control the power of the pilot channel of the terminal, and controls a channel other than the pilot channel with a fixed value of TPR. For example, assuming that the TPR is 3dB, this means that the power ratio of the traffic channel and the pilot channel transmitted by the terminal is 2: 1, so that when the terminal determines the power gain of the traffic channel, the pilot Adjust to double the power of the channel. In the same principle as for the other types of channels, the gain of the corresponding channel relative to the gain of the pilot channel is controlled with a fixed value.

The system for controlling the TPR instead of the base station to control the transmission rate of the terminal, in the control of each of the scheduling of the reverse transmission of the various terminals of the base station, instead of controlling the way to inform the data rate of the scheduled results directly to each terminal This is a way of telling the allowed TPR. As the data rate increases, the TPR increases. For example, doubling the data rate means that the power allocated to the traffic channel by the terminal is about twice as large, which means that the TPR is doubled. In a typical mobile communication system, since the terminal and the base station have previously known the relationship between the data rate of the reverse traffic channel and the TPR through the table, the term "substantially controlling the data rate of the terminal" and "controlling the terminal's TPR" are the same. It can be interpreted as meaning. In the following description, for the sake of brevity, only the manner in which the base station controls the data rate of the terminal will be described.

Next, the transmission rate control method according to different services using TPR will be described.

Typically, the base station and the mobile station promise and store the TPR value for each data rate in advance as shown in Table 1 below.

Data Rate of R-PDCH [kbps] TPR of R-PDCH [dB] 19.2 1.00 38.4 3.75 76.8 6.50 153.6 8.00 307.2 9.00 460.8 10.00 614.4 10.00 921.6 10.00 1228.8 10.00

The TPR is a value representing the ratio of the power of the traffic channel to the power of the pilot channel of the mobile station. The method of use thereof is as follows. If the base station grants a specific TPR to the mobile station, it means that the terminal is allowed to transmit packet data at a data rate corresponding to the authorized TPR. For example, assuming that both the base station and the terminal have a TPR table as shown in Table 1, when the base station grants 8.0 dB of TPR to a specific mobile station, the mobile station is assigned to the TPR of 8.0 dB in FIG. This means that data can be transmitted at a data rate of 153.6 kbps. If a mobile station transmits data at 153.6 kbps at a specific time point and the base station of DRC mode receiving the data has received an uplink rate (RC UP command), the mobile station transmits data to the next transmission interval based on the <Table 1>. It means that 9dB of TPR is allowed, so it can transmit 307.2 kbps of traffic.

However, in a specific mobile communication system, for example, a CDMA 1x EV-DV system, one terminal may transmit data of two or more services requiring different QoS. In this case, the transmission power or TPR allocated to each is controlled to have different values even for the same data rate. This is because services requiring different QoS have different requirements regarding QoS such as delay time and frame error rate (FER). Therefore, to satisfy this, it must have a different TPR table from Table 1 above. Table 2 shows an example of a TPR table for providing data rates for two different services.

Data Rate of R-PDCH [kbps] TPR of Service 1 [dB] TPR of Service 2 [dB] 19.2 1.00 2.76 38.4 3.85 5.61 76.8 6.70 8.46 153.6 9.40 11.16 307.2 12.00 13.76 460.8 13.60 15.36 614.4 14.40 16.16 921.6 16.10 17.86 1228.8 17.40 19.16

As can be seen from Table 2, the TPR values for each service have different values. Then, let's take a look at how to use <Table 2>. For example, if the specific mobile station in the table 2 is granted a TPR of 15dB, if the mobile station wants to transmit a packet for the service 1, the packet for the service 1 in the range of 15dB to 614.4 kbps Can transmit If the mobile station wants to transmit a packet for service 2, it can transmit a packet for service 2 at 307.2 kbps within a range of 15 dB.

Next, a method of controlling a transmission rate when using a multi-TPR table will be described. In the reverse direction of the currently defined 1x EVDV system, the UE transmits data using up to two TPR tables (Normal TPR Table / Boost TPR Table). The Normal TPR Table is a table that serves as a TPR reference when transmitting general data, and the Boost TPR Table is a TPR reference table used when transmitting data requiring less packet delay. Table 3 below is an exemplary embodiment of the Normal TPR Table and the Boost TPR Table.

EP size Normal TPR Table Boost TPR Table 174 0.75 2.5 386 3.75 5.5 770 6.75 8.5 1538 9.625 11.375 3074 14.5 16.25 4610 16.25 18 6146 17.5 19.25 9218 19.25 21 12290 20.625 22.375 15362 21.75 23.5

In the case of using the table as shown in Table 3, the UE needs to inform the base station which table is used to transmit data. Accordingly, the terminal transmitting the data informs the base station of the size of the packet currently being transmitted and whether the Boost TPR table is used. After the transmission of the current packet, the base station and the terminal must reset the allowed rate or TPR using the uplink rate or downlink rate information for the next transmission. In this case, the normal TPR table is used as the reference TPR table.

Next, a case in which the terminal determines the next transmission rate after transmitting data at a lower transmission rate than the allowed TPR value will be described with reference to Table 3. In the example of Table 3, when the UE is allowed to receive a TPR of 14.5 dB for the second service, a packet of any size smaller than that may be transmitted. Therefore, in this case, it is possible to boost and transmit 770 bits at 8.5 dB lower than the allowed TPR value for the second service. In this case, at the end of the transmission, the base station and the terminal must update the TPR allowed for the next transmission. The reference point at this time is determined from the Normal TPR Table. Therefore, when determining the TPR for the second service, the smallest TPR value among the TPR values larger than 8.5 dB in the normal TPR table becomes a reference value. Then, in Table 3, it becomes 9.625 dB corresponding to 1538 bits. At this time, if the transmission to the maximum possible EP is not reset.

In other words, the rate control information that arrives after transmitting 770 at 8.5dB after being allocated 14.5dB is applied to 9.625dB. When receiving a command to increase the rate, the next allowed TPR is 14.5dB. In case of command, it is judged as 6.75dB. This TPR resetting operation determines that there is not enough data to use all of the initially set TPR in the case of a terminal transmitting a TPR or EP lower than its assigned TPR, and the TPR resetting is performed based on the immediately transmitted TPR.

In the case of a UE operating in the common rate control mode, the currently allocated TPR value does not match each TPR entry in the Normal TPR Table. That is, if all UEs increase or decrease the transmission rate through common control information, RoT variation of the entire cell becomes too large, and in order to prevent this, the currently allocated TPR is previously determined in order to prevent this. To increase or decrease by only a certain amount. In this case, the value of the currently allocated TPR may be equal to 10 dB.

The UE operating in the common rate control mode finds an entry in the Normal TPR Table corresponding to its TPR before determining boosting. For 10dB, an entry of 1538 bits is selected and behaves as if the currently assigned TPR is 9.652dB, which is 1538.

In the common rate control mode, the UE operation finds a normal TPR table entry corresponding to an assigned TPR (TPR) and performs an operation based on the TPR value specified in the entry. That is, as shown in the example of Table 3, even if the currently allocated TPR is 10 dB, the largest entry of 9.652 dB or less of 10 dB or less is selected first, and then the transmission rate is determined for an entry of 9.652 dB or less. In this case, the loss is 0.348dB. In some cases, the entry value of the Boost TPR Table that can be selected changes. For example, if the currently allocated TPR is 11.375dB, the terminal selects an entry based on 9.652dB, so that the terminal can transmit from 770 bits of EP of the Boost TPR Table, but if 11.375dB is used, it can transmit from 1538 bits of EP.

Accordingly, an object of the present invention is to provide an apparatus and method for setting a rate in a mobile communication system capable of transmitting two or more different data in reverse directions.

Another object of the present invention is to provide an apparatus and method for transmitting data without loss of TPR in a common power control mode in a mobile communication system capable of transmitting two or more different data in reverse directions.

Another object of the present invention is to provide an apparatus and method for efficient TPR transmission in a common power control mode in a mobile communication system capable of transmitting two or more different data in reverse directions.

The method of the present invention for achieving the above objects is a method for determining the rate of reverse traffic using the pilot power rate value received in the forward direction in the mobile communication system capable of transmitting two different data in the reverse direction, and allowed in the forward direction When receiving a pilot power ratio compared to the received traffic, selecting a table to apply the received pilot power ratio relative to the traffic from the size of the packet and the rate table according to the pilot power ratio compared to the traffic having different values received in advance And setting an entry of one of values smaller than the allowed traffic-to-pilot power-rate value in the selected table, and transmitting an encoded packet, and an entry of the transmitted encoded packet to pilot-to-pilot power rate. Yen sent if less than value Lee comprises the step of updating the value issued by the traffic compared to pilot power ratio value.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

The method according to the invention is a method of efficiently controlling the TPR. The contents of the present invention will then be outlined first. In the present invention, as a new TPR control method of a terminal and a base station operating in a common rate control mode, unlike a conventional TPR control method, instead of using a single reference table, the TPR table is defined differently for each service. We present a method of controlling TPR. That is, in the present invention, it has two TPR tables, one table is a Normal TPR Table, and the other table is a Boost TPR Table. In the present invention, when the normal TPR table is used to determine the TPR of the packet data currently transmitted in the CDMA2000 system having these two tables, the TPR value is adjusted after the transmission based on the Normal TPR Table. And when the Boost TPR Table is used to determine the TPR of the currently transmitted packet data will be described as an embodiment of a method for adjusting the value of the TPR after transmission based on the Boost TPR Table.

The terminal and the base station deliver the TPR table to be used in advance in the call setup process or the service setup process when the call setup process or a new service arrives. The terminal receiving this can determine the transmission rate for the service compared to the currently allocated reverse TPR based on the table. Only one such TPR table may exist for several services, and each service may have a different TPR table. In systems such as CDMA2000 1x, the standard suggests that up to two TPR tables can be defined. The terminal transmitting data in the reverse direction should inform the base station about which table the data rate is determined based on. The base station receiving the EP size and the TPR table information transmitted in the reverse direction should determine the next transmission rate of the terminal. The base station, which has determined the next rate in consideration of the situation in the cell or the transmission status of each user, increases or maintains a rate control bit (hereinafter referred to as "RCB"), which indicates a rate up, a sustain rate, or a rate down rate. Determine by sending (HOLD) or decrease (DOWN) and then inform the UE of the data rate. In determining the next transmission rate, the standard of applying the RCB is a reference value of one TPR table in the conventional method. However, in the present invention, the RCB is applied based on the TPR table used for transmission to minimize the waste of the allowed TPR. can do.

The terminal may determine the TPR table T _i to be used for transmission according to the type of data generated. The UE may obtain the maximum index number (max_index) of the entry having the largest TPR while being smaller than the TPR (authorized_TPR) and the value of the currently allocated TPR in T _i . The terminal may select an EP of index number k suitable for transmitting data generated when the index number is equal to or smaller than max_index. The terminal receiving RCB r after transmitting data should reset the value of authorized_TPR before applying RCB r. If the value of k is equal to max_index, the terminal applies RCB r without changing the value of authorized_TPR. On the other hand, if the value of k is smaller than max_index, the terminal sets the value of authorized_TPR to a TPR value corresponding to T _i [k] and then applies RCB r. When the RCB r is 'UP', the UE determines the next data rate by adding the TPR value corresponding to the delta_up function to the current authorized_TPR value. In contrast, when RCB r is 'DOWN', the next data rate is determined by subtracting the TPR value corresponding to the delta_down function from the authorized_TPR value. And if RCB r is 'HOLD', authorized_TPR value is not changed. These delta functions are functions that the base station gives to the terminal during call setup or service setup. It calculates the variation of the TPR to be applied for each RCB 'UP', 'HOLD', or 'DOWN' command for the current TPR. Function.

Next, a transmission rate determination and update method of the terminal will be described with reference to FIG. 1. 1 is a control flowchart of determining and updating a transmission rate of a terminal according to an exemplary embodiment of the present invention. When the data to be transmitted, the terminal determines the TPR table Ti to be used for the transmission of the data in step 101. That is, it is determined whether to use a normal TPR table or a boost TPR table as the TPR table. After determining the table to be used for data transmission as described above, the terminal proceeds to step 102 and calculates max_index that can be transmitted by the assigned authorized_TPR. This will be described with reference to the service-specific TPR table according to the present invention of Table 4 below.

Entry EP size Normal TPR Table Boost TPR Table One 174 0.75 2.5 2 386 3.75 5.5 3 770 6.75 8.5 4 1538 9.625 11.375 5 3074 14.5 16.25 6 4610 16.25 18 7 6146 17.5 19.25 8 9218 19.25 21 9 12290 20.625 22.375 10 15362 21.75 23.5

Table 4 shows, as an example, different TPR tables when controlling backward in the CDMA2000 system as the TPR table according to the present invention. In the CDMA2000 system, two tables, a normal TPR table for backward control and a Boost TPR table for reducing transmission delay, are used.

Consider a case in which the value of authorized_TPR allocated by the current UE in the common power control mode is 12dB and the transmission TPR is selected using the Boost TPR table. In this case, the value of max_index is 4. The process of performing such a determination becomes step 102 of FIG. 2. After determining the data rate as described above, the terminal proceeds to step 103. In step 103, the terminal determines the size of the EP to be used for actual transmission, and proceeds to 104 to transmit the determined encoded packet. In the above example, the entry that can be set in step 103 may transmit data by configuring an EP with one of 174, 386, 770, and 1538 bits corresponding to 1, 2, 3, and 4.

After completing the data transmission in step 104, the terminal should update its authorized_TPR. Therefore, the terminal proceeds to step 105. The terminal proceeds to 105 to check whether the value of the entry is smaller than the largest value of the settable EP size. That is, with reference to the above example will be described. First, the terminal may transmit data by configuring an EP with one of 174, 386, 770, and 1538 bits corresponding to 1, 2, 3, and 4. However, the data to be actually transmitted may be smaller than the maximum of the above sizes. So in this case we will select the number of the smaller entry. However, if there is more data than the maximum transmission bit size, the data will be transmitted in the EP of the maximum size. Therefore, the terminal checks whether the entry number of the EP transmitted in step 104 is smaller than the max_index value in step 105. If it is not small, then data is transmitted with the maximum EP size. However, if the entry number is small, the transmission is performed with a smaller data size. Therefore, in this case, the TPR must be reset.

For example, when the size of the EP transmitted in step 104 is 770 bits, the UE resets the value of authorized_TPR to 8.5 dB corresponding to entry 3 and then receives RCBs' UP ',' DOWN ',' HOLD 'command is applied based on 8.5dB. In other words, in step 106, the reset is performed according to the size of the PE to which the authorized_TPR value is transmitted, and then data transmission is completed.

Then, the present invention as described above will be briefly described in comparison with the prior art. In the prior art, since the TPR is always set based on the Normal TPR Table, when the authorized_TPR value is 12 dB, the largest EP that can be transmitted below 12 dB is first found in the Normal TPR Table. Referring to this in Table 4, the entry value is 4 and the size of the EP is 1538 bits. The EP to be used for the actual transmission is obtained by using 9.625 dB, which is a TPR value corresponding to the selected entry. In this case, when the Boost TPR Table is used, the size of the EP that can be actually transmitted becomes EP of 174, 386, and 770 bits having a lower transmission TPR than 9.625dB, so there is a waste of TPR compared to the technique proposed by the present invention. That is, in the case of selecting the EP in this way, even when the UE can transmit 1538 bits of data, the UE has no choice but to select an EP of 770 bits having the largest EP size that can be selected when selecting the Boost table. However, since the value of authorized_TPR received from the base station is 12dB, although the actually selectable value is 1538 bits, the small value must be selected as a result, resulting in a loss of transmission rate.

2 is a control flowchart when receiving a RCB in a terminal according to a preferred embodiment of the present invention. Hereinafter, referring to FIG. 2, the control process when the RCB is received by the UE will be described in detail.

The terminal receives the RCB value from the base station after transmitting the data through the process as shown in FIG. When the RCB value is received as described above, the terminal proceeds to step 201 and checks whether the received RCB value indicates 'UP'. If the RCB value received as a result of the check in step 201 indicates 'UP', the terminal proceeds to step 202 and adds the authorized_TPR by adding the value of the delta_up function to the authorized_TPR previously received, that is, used during data transmission of FIG. 1. Update On the other hand, if the RCB value received as a result of the check of step 201 does not indicate 'UP', step 203 is performed. In step 203, the terminal checks whether the received RCB value indicates 'DOWN'. If the RCB value received as a result of the check in step 203 indicates 'Down', the terminal proceeds to step 204. When proceeding to step 204, the terminal updates the value of authorized_TPR by subtracting the value of the delta_down function from the authorized_TPR received when determining the data rate of FIG. 1 described above. However, unless the RCB value received as a result of the check in step 203 indicates 'DOWN', the authorized_TPR value is maintained.

3 is a block diagram of a terminal for processing TPR determination and RCB reception according to a preferred embodiment of the present invention. Hereinafter, a configuration and operation for processing TPR determination and RCB reception according to the present invention will be described in detail with reference to FIG. 3.

The receiver 310 converts information of a predetermined control channel received from the base station into a form of a signal that can be processed by the controller 311 and outputs the converted signal. In the present invention, an apparatus for receiving and processing TPR table information, Authorized_TPR value, RCB value, etc. according to different services initially received from a base station is provided. The receiver 310 receives the TPR table as shown in Table 4 and transmits the same to the controller 311 at the initial operation. Then, the controller 311 stores the data of the received TPR table in the TPR memory 312. The receiver 310 also outputs the Authorized_TPR value and the RCB value to the controller 311. The Authorized_TPR value and the RCB value may then be stored in the decision factor memory 313. The control unit 311 is a device for processing the above-described control process of Figures 1 and 2 will be described in more detail later.

The transmission memory 314 is a memory capable of storing two or more different service data. The transmission memory 314 outputs the type of data currently stored in the memory and the amount of information stored in the memory according to each type to the controller 311. The control unit 311 outputs to the transmitter 315 the amount of data constituting the encoded packet according to the control information of the encoded packet output from the controller 311. The transmitter 315 encodes the data received from the transmission memory 314 based on the control signal received from the controller 311 and determines the size according to the control signal among the encoded data. The determined data transmits the data to the base station through the reverse packet data channel at the transmission rate and the transmission power determined by the control unit 311.

The operation performed by the controller 311 will be described in more detail. When the controller 311 receives the initial Authorized_TPR value, the controller 311 stores the received Authorized_TPR value in the decision factor memory 313. Then, the TPR table to be used is determined according to whether current data to be transmitted is first service data or second service data. In the determined TPR table, the maximum index value is determined as described with reference to FIG. 1. After determining the index value, the size of the EP to be transmitted is determined from the type and amount of data stored in the transmission buffer received from the transmission memory 314. When the EP is determined to be transmitted, the controller controls the transmitter 315 to output a corresponding amount of data from the transmitter memory 314 to the transmitter 315, encodes it, and then controls the transmitter 315 to transmit the corresponding power and data rate. . Thereafter, the control unit 311 checks whether the transmission rate of the data transmitted from the transmission memory 314 is the maximum value that can be set from the Authorized_TPR value. If the check result is not the maximum value, the Authorized_TPR value is newly updated and stored in the decision factor memory 313.

Then, when RCB information is received from the receiver 310 through the control channel, the controller 311 checks whether the state indicated by the received RCB indicates whether the data rate is increased, decreased or maintained. Accordingly, when an increase or decrease is indicated, the update function stored in the determinant memory 313 is read in advance to determine delta_up or delta_down. Then, by adding or subtracting the Authorized_TPR value previously stored using the determined value, the Authorized_TPR value to be transmitted next is updated and stored. This updates the Authorized_TPR value. The function for updating the data rate is a value previously received at the time of initial call setup, and the controller 311 may store it in a predetermined area of the decision factor memory 313 in advance.

As described above, when the mobile terminal provides two or more different services in the reverse direction, the transmission rate can be more efficiently determined, thereby increasing the throughput of the system.

1 is a control flowchart of determining and updating a transmission rate of a terminal according to an embodiment of the present invention;

2 is a control flowchart when receiving a RCB at a terminal according to a preferred embodiment of the present invention;

3 is a block diagram of a terminal for processing TPR determination and RCB reception according to a preferred embodiment of the present invention.

Claims (1)

In the mobile communication system capable of transmitting two different data in the reverse direction, a method for determining the rate of reverse traffic using the pilot power rate value compared to the traffic received in the forward direction, When receiving a pilot power ratio compared to the traffic allowed forward, a table to apply the pilot power ratio to the received traffic from the size of the coded packet according to the pilot power ratio and the transmission rate table having different values received in advance The process of choosing Transmitting an encoded packet by setting one entry among values smaller than the allowed traffic-to-pilot power rate value in the selected table; And if the entry of the transmitted encoded packet is smaller than the allowed traffic to pilot power rate value, updating the allowed value to the traffic to pilot power rate value of the transmitted entry.