RU2233547C2 - Device and method for gating transmission of data transfer speed control-channel signal in mobile communication system distinguished by high data transfer speed - Google Patents

Abstract

FIELD: transmitting signal of data transfer speed control channel in mobile system including signal gating and retransmission.

SUBSTANCE: access terminal of mobile communication system transfers information about data transfer speed control signal pointing to one of chosen direct data transfer speed requested by access terminal to access network. The latter assigns length of information about data transfer speed control signal "data speed control signal length" pointing to number of time intervals during which this information is repeated and transfers assigned length of information to access terminal. The latter gates transfer of information about data transfer speed control signal to access network within one time interval for each length of information received from access network.

EFFECT: enhanced noise immunity.

41 cl, 29 dwg

Description

The present invention relates, in General, to a device and method for transmitting a signal of a data rate control channel (DRC) in a mobile communication system using a high data rate (IR) method, and, in particular, to a device and method for gating or repeating transmission signal channel RDM (signal RDM).

In the IS-2000 communication system, when the channel is in good condition, the base station and the mobile station perform power control in order to communicate with a prescribed data rate. On the other hand, in the IRR mobile communication system, access terminals (corresponding to mobile stations in the IS-2000 system) transmit DRC signals to the access network (corresponding to the base station in IS-2000) at intervals of a predetermined number of time intervals, and the access network then analyzes the DRC received from the access terminals, and selectively transmits data only to the access terminals when the channel is in good condition after the data transmission control. The VSD system has a direct communication line with significantly increased throughput so that it transmits a large amount of data per unit of time with good channel condition, and transmits a small amount of data per unit of time with poor channel condition by changing the packet length using one common data channel within the limits of the maximum capacity of the access network. That is, the VVD system transmits data only to one of the access terminals within the considered access network at a certain time through a common data channel. The VDS mobile communication system transmits channel status information and data rate control (RDM) information using the RDM signal. Regarding the DRC signal, the access terminal measures the ratio of the carrier frequency to interference (LF / P) of the pilot signal transmitted on the forward link, generates the DRC signal based on the measured LF / P, and then reports the created DRC signal to the access network via the DRC signal.

The pilot signal is used to obtain initial synchronization of data transmitted from the access terminal to the access network, to restore the signal, and to indicate reverse link power control information. Meanwhile, the reverse data rate indicator (RCD) used in the IRR system is a signal for indicating the data rate of the reverse link and synchronization (time alignment) of frames, each of which contains 16 time intervals. The DRC signal and the pilot signal are transmitted based on time division multiplexing (RTM). In addition, the USOD signal provides an index inserted in the punctured portion of the encoded pilot packet to help the access network determine the data rate. Table 1 below shows the indices of the transmission rate of the reverse data in accordance with the speeds of the reverse link.

In Table 1, when data is transmitted on the reverse link with a data rate of 153.6 Kbps, the 3-bit symbol is transmitted to the access network via the data rate index channel by repeating the Walsh symbol using an orthogonal code of length 4. Table. 2 below shows a coding table of a signal of the RDM channel.

The access terminal measures the LF / P signal transmitted from the access network, converts the measured LF / P into a code word related to the data rate required by the access network, in accordance with Table 1, and then reports the results to the access network. As shown in table 2, the signal RDM contains a symbol of 4 bits. A 4-bit character is converted to an 8-bit codeword using block coding. Code words are converted at the required bit rate direct channel data rates.

Figure 1 illustrates the structure of a reverse link transmitter in a conventional IRR mobile communication system. Referring to figure 1, the multiplier 102 extends the channel of the pilot signal 101 by multiplying it by the orthogonal function W $\genfrac{}{}{0ex}{}{\text{4}}{\text{0}}$ length 4 at each time interval and outputs an unmodulated signal 1024 chips having a value of '0'. USOD 103 is fed into an octal orthogonal modulator. The octal orthogonal modulator 105 performs octal orthogonal modulation with respect to the applied RCD and outputs the Walsh symbol. The Walsh symbol repeater 107 repeats the Walsh symbol derived from the octal orthogonal modulator and feeds its output signal to the multiplier 109. The multiplier 109 multiplies the Walsh symbol derived from the Walsh symbol repeater 107 by the orthogonal function W $\genfrac{}{}{0ex}{}{\text{4}}{\text{0}}$ length 4 in each time interval and outputs 64 chips in a time interval. Block encoder 118 (8, 4, 4) block encodes the input DRC 115. The codeword repeater 119 repeats the block encoded DRC a predetermined number of times. Multiplier 121 expands the symbols derived from the codeword repeater 119 by multiplying them by the orthogonal function W $\genfrac{}{}{0ex}{}{\text{2}}{\text{0}}$ length 2. The Walsh coverage generator 113 outputs an orthogonal function of length 8 corresponding to the Walsh coverage index 111 of the input DRC. A multiplier 123 multiplies the output of the multiplier 121 by the output of the Walsh coverage generator 113. Multiplier 125 multiplies the data output from multiplier 123 by the orthogonal function W $\genfrac{}{}{0ex}{}{\text{4}}{\text{0}}$ length 4. The time division multiplexer 127 (MRI) multiplexes in time the pilot channel signal, the USOD channel signal and the USD channel signal output from the multipliers 102, 109, and 125, respectively, and supplies its output signal to the complex expander 141 as an in-phase component. Encoder 131 encodes the traffic channel input 129. Modulator 133 performs DPSK (binary phase shift keying) modulation with respect to the encoded traffic data. An interleaver 135 interleaves the data modulated by the DPSK. The data signal amplification controller 137 controls the amplification of the output signal of the interleaver 135. The multiplier 139 expands the channel signal output from the data signal amplification controller 137 by multiplying it by the orthogonal function W $\genfrac{}{}{0ex}{}{\text{4}}{\text{2}}$ length 4, and delivers its output signal to the complex expander 141 as a quadrature phase component. Integrated expander 141 comprehensively expands the common-mode component signal and the quadrature-phase component signal. The baseband filter 143 filters the complexed signal from the complex expander 141 over the baseband.

As described above, the pilot channel signal, the DRC channel signal and the DRC channel signal are transmitted to the access network after time multiplexing.

FIG. 2 illustrates a method for transmitting a DRC channel signal in a conventional IRR system. As illustrated, each frame consists of 16 time intervals, each having a length of 2048 chips (= 1.66 ms). In each time interval, the pilot channel signal and the DRC channel signal are multiplexed in time in a block of 46 chips before transmission. Each user (regardless of which group it belongs to) continuously transmits a time-multiplexed pilot channel signal and a channel signal of the DRC. In this case, interference occurs between users.

That is, as stated above, the IRR system continuously transmits the pilot signal and the DRC channel signal to the access network while the data service is connected. Meanwhile, for high-speed data transmission, information regarding the LF / R and the signal of the RDM channel transmitted through the reverse link should be correct. However, as shown in FIG. 2, since each user continuously transmits a time-multiplexed pilot channel signal and a DRC signal to the access network, interference occurs between the pilot signals. If the access network cannot correctly detect the DRC signal, the access network cannot correctly plan the data rate and the sector required by the access terminal, so that it is impossible to serve additional new users. That is, in a conventional VVD system, when the number of users increases, it is difficult for the access network to detect the VDM signal correctly, making it impossible to serve new users.

Although FIG. 2 depicts a case where the pilot channel signal and the DRC channel signal are multiplexed in time, the same problem may occur even in the case where the pilot channel signal and the DRC channel signal are code division multiplexed.

Thus, it is an object of the present invention to provide an apparatus and method for gating the transmission of a signal of a DRC channel in order to prevent interference between the signals of the DRC channels in the IRR mobile communication system.

Another objective of the present invention is to provide a device and method for transmitting a DRC channel signal with a transmit power less than the pilot transmit power by repeating the DRC channel signal in order to prevent interference between the DRC channel signals in the IRR mobile communication system.

Another objective of the present invention is to provide a device and method for determining the quantization speed with which the access terminal gates the transmission of the DRC channel signal by inverting the duration of the DRC information in a mobile communication system in which the access network transmits the duration of the DRC information indicating the frequency of the DRC information at multiple time intervals, to the access terminal during call setup.

In order to solve the above and other problems, a communication method is proposed in a mobile communication system in which the access terminal transmits a signal ("DRC information") to the access network indicating the selected one speed from the data rates requested by the access terminal. The access network determines the duration of the DRC information (signal) (“DRC duration”) indicating the number of time intervals where the DRC information is repeated, and transmits a specific duration of the DRC information to the access terminal. The access terminal gates the transmission of the DRC information to the access terminal with one time interval in each duration of the DRC information received from the access network.

The above and other objectives, features and advantages of the present invention will become more clear from the following detailed description, accompanied by drawings, in which:

figure 1 is a diagram illustrating the structure of the reverse link in a conventional mobile communication system IRR;

figure 2 is a diagram illustrating a method of transmitting a channel signal RDM in a conventional mobile communication system IRR;

FIG. 3 is a diagram illustrating how an access network applies the data rate required by an access terminal to transmit data based on a DRC channel signal received from an access terminal in a conventional VVD mobile communication system;

4 is a diagram illustrating a structure of a reverse link transmitter for transmitting a DRC channel signal in an IRR mobile communication system in accordance with an embodiment of the present invention;

5 is a diagram illustrating the operation of strobing the transmission of a signal of a DRC channel to an access network and applying bias to user pilot signals before transmission in the IRR mobile communication system in accordance with an embodiment of the present invention;

6 is a diagram illustrating the operation of strobing the transmission of the signal of the DRC channel to the access network and not applying bias to the pilot signals before transmission in the IRR mobile communication system in accordance with an embodiment of the present invention;

Fig. 7 is a diagram illustrating a method for transmitting signals of DRC channels divided into 4 user groups and pilot signals having a shift in the IRR mobile communication system in accordance with an embodiment of the present invention;

Fig. 8 is a diagram illustrating a method for transmitting signals of DRC channels divided into 4 groups of users and pilot signals without a shift in the IRR mobile communication system in accordance with an embodiment of the present invention;

9 is a diagram illustrating an embodiment of an access network receiver in an IRR mobile communication system in accordance with an embodiment of the present invention;

10 is a diagram illustrating another embodiment of an access network receiver in an IRR mobile communication system in accordance with an embodiment of the present invention;

11 is a flowchart illustrating a method of gating the transmission of a signal of a DRC channel based on the received value

in the IRR mobile communication system in accordance with an embodiment of the present invention;

12 is a flowchart illustrating a method of switching from a gated transmission mode of a reverse link DRC channel to a continuous transmission mode in an access terminal in an IRR mobile communication system in accordance with an embodiment of the present invention;

13 is a diagram illustrating a boundary value between a measured value

and size

for determining the error rate of the signal symbol of the channel RDM and the transmission mode in the access network in the mobile communication system IRR in accordance with the implementation of the present invention;

Fig. 14 is a flowchart illustrating a method for gating a signal transmission of a reverse link DRC channel in an access terminal in an IRR mobile communication system in accordance with an embodiment of the present invention;

15 is a diagram illustrating a method for transmitting the same DRC channel signal information over 4 consecutive time intervals with 25% of the pilot transmit power in the IRR mobile communication system in accordance with an embodiment of the present invention;

16 is a diagram illustrating a case where one method of transmitting the same DRC information after 4 consecutive time intervals with a transmit power less than the transmit power of the pilot signal, and another method of gating transmit data of the DRC are simultaneously applied in the IRR mobile communication system in accordance with the implementation of the present invention;

17 is a diagram illustrating a structure of a reverse link transmitter for transmitting a DRC channel signal in an IRR mobile communication system in accordance with an embodiment of the present invention;

FIG. 18 is a flowchart illustrating a method of switching from an existing continuous DRC transmission mode to a transmission mode for transmitting the same DRC channel signal information through at least 2 consecutive time intervals at a transmission power level lower than the power transmitting a pilot signal when the value calculated by the access network by measuring the signal transmitted from each user exceeds the bandwidth of the reverse link;

FIG. 19 is a flowchart illustrating a procedure for transmitting a signaling message including quantization rate information in accordance with an embodiment of the present invention; FIG.

20 is a flowchart illustrating a procedure for determining an initial time interval for transmitting DRC information by receiving a signaling message including quantization rate information in an access terminal in accordance with an embodiment of the present invention;

21 is a diagram illustrating the starting point of application of the DRC information in a transmission method in which a quantization rate = 1/4 of a quantized transmission mode is applied in a case where the same DRC information is repeated 4 times (“DRC duration” = 4), in accordance with the implementation of the present invention;

22 is a diagram illustrating a point of application of the DRC information in a transmission method in which a quantization rate = 1/2 of the quantized transmission mode is applied in a case where the same DRC information is repeated 2 times (“DRC duration” = 2), in accordance with the implementation of the present invention;

23 is a diagram illustrating the initial point of application of the DRC information in which the quantization speed = 1/4 of the DRC transmission mode for the case where the same DRC information is repeated 4 times (“DRC duration” = 4), in accordance with an embodiment the present invention;

24 is a diagram illustrating a method for transmitting signals of DRC channels divided into 4 user groups in the case where the pilot signal and the DRC channel signal are code division multiplexed in the IRR mobile communication system in accordance with an embodiment of the present invention;

25 is a diagram illustrating a structure of a reverse link transmitter for transmitting a DRC channel signal in a case where the pilot signal and the DRC channel signal are code division multiplexed in the IRR mobile communication system in accordance with an embodiment of the present invention;

26 is a diagram illustrating a structure of a forward link transmitter in accordance with an embodiment of the present invention;

FIG. 27 is a flowchart illustrating a procedure for determining a data rate and an access terminal for receiving a direct signal described in FIG. 28.

28 is a diagram illustrating an interval for checking a direct data signal while the access terminal generates the following DRC information after reporting the DRC information to the access network in accordance with an embodiment of the present invention;

29 is a flowchart illustrating a procedure for detecting direct traffic after transmitting DRC information in an access terminal in accordance with an embodiment of the present invention.

A preferred embodiment of the present invention will be described hereinafter with reference to the accompanying drawings. Further, a detailed description of well-known functions or constructions is omitted in order to more clearly present the invention.

In the following description, the term “quantization rate (“ RDM quantization rate ”)” refers to a rate indicating how many time intervals the RDM channel signal (RDM signal) is transmitted during the gated transmission of the RDM signal. In addition, the term “user group” refers to a plurality of users which transmit the signal of the DRC channel to the access network in the same quantization period and have the same starting point for transmitting the DRC in the frame.Not one, but several users exist in each of the user groups.

In addition, the term "repetition frequency (" DRC duration ")" refers to the transmission frequency of the same DRC signals ", which indicates how many time intervals the same signal is repeated during the retransmission of the same DRC signal. Quantization speed ("RDM quantization rate") is defined as the reciprocal of the repetition frequency ("RDM duration"), in accordance with the present invention. In addition, the term "continuous transmission mode" refers to a mode where the user continuously transmits the RDM signal to each m time interval, and the concept of “gated (or quantized) transmission mode” refers to a mode where the user periodically gates the transmission of the DRC signal in accordance with the quantization rate (or gating speed) assigned by the access network. In addition, the concept of “retransmission mode "refers to a mode where a user retransmits the same signal in accordance with a repetition rate (" DRC duration ") determined by the access network. The present invention can switch from a continuous transmission mode to a gated transmission mode, from a continuous transmission mode to a retransmission mode, and from a retransmission mode to a gated transmission mode and vice versa.

Figure 3 illustrates the determination of the time during which the access terminal (AP) measures the LF / R signal transmitted from the access network (LED) and transmits a DRC signal requiring a specific data rate to the access network, and the access network then applies the transmission rate the data required by the access terminal for transmitting data based on a DRC signal received from the access terminal. In Fig. 3, the access network applies the desired data rate through the DRC signal half the time interval after receiving the DRC signal from the access terminal. Therefore, the VSD system schedules the transmitted user DRC signals half the time interval before one encoded packet ends, and provides data service for the user in good condition of the signal in the next encoded packet at maximum power.

A gated DRC signal transmission method will now be described in order to reduce interference between user DRC signals when reverse link throughput is exceeded, in accordance with an embodiment of the present invention.

4 illustrates the structure of a reverse link transmitter for transmitting a DRC signal in an IRR mobile communication system in accordance with an embodiment of the present invention.

Referring to FIG. 4, a multiplier 102 orthogonally extends pilot data 101 by multiplying them by a predetermined orthogonal code W $\genfrac{}{}{0ex}{}{\text{4}}{\text{0}}$ . A switch 401 under the control of a controller (not shown) switches the output of the multiplier 102 to a time division multiplexer 127 (MPX) or to a delay element 403 for 64 chips. Delay element 403 delays (or buffers) the output of multiplier 102 for a predetermined time (e.g., chip interval 64) and provides its output to multiplier 127.

The octal orthogonal modulator 105 performs octal orthogonal modulation with respect to the input of the reverse data rate indicator (RCD) 103 and provides an output symbol. The Walsh symbol repeater 107 repeats the symbol deduced from the octal orthogonal modulator 105 a predetermined number of times. The multiplier 109 orthogonally expands the output of the repeater 107 Walsh symbols by multiplying it by the Walsh code W $\genfrac{}{}{0ex}{}{\text{4}}{\text{0}}$ .

The block (8, 4, 4) encoder 117 performs block coding (8, 4, 4) with respect to the input 4-bit information 115. The code word repeater 119 repeats the code word derived from the block (8, 4, 4) encoder 117 in advance a certain number of times. Multiplier 121 orthogonally expands the output of the codeword repeater 119 by multiplying it by a predetermined Walsh code W $\genfrac{}{}{0ex}{}{\text{4}}{\text{0}}$ length 2. The Walsh coverage generator 113 outputs the Walsh coverage to divide the sector by the received Walsh coverage index of the DRC signal. A multiplier 123 multiplies the output of the multiplier 121 by the output of the Walsh coverage generator 113. A switch 405 under the control of the controller gates the output of the multiplier 123. The multiplier 125 multiplies the output of the switch 405 by the Walsh code W $\genfrac{}{}{0ex}{}{\text{4}}{\text{0}}$ . The multiplier 127 multiplexes in time the output signals of the multiplier 102 (or delay element 403), the multiplier 109, and the multiplier 125.

The encoder 131 encodes the input traffic data, and the modulator 133 modulates the DFM output signal of the encoder 131. An interleaver 135 interleaves the output signal of the modulator 133. A signal amplification controller 137 controls the amplification of the output signal of the interleaver 135. A multiplier 139 multiplies the output of the signal amplification controller 137 by a predetermined Walsh code W $\genfrac{}{}{0ex}{}{\text{4}}{\text{2}}$ length 4. Complex expander 141 comprehensively expands the output signal (channel I signal) of multiplexer 127 and the output signal (channel Q signal) of multiplexer 139 by multiplying it by a predetermined pseudo-noise (PN) code. The baseband filter 143 filters the output signal of the complex expander 141 on the baseband. The filtered signal is converted into a radio frequency (RF) signal by upconverting, and then transmitted to the access network.

In a conventional VVD mobile communication system, the reverse link is designed so that each user must report the RDM signal to the access network at each time interval. In the present invention, when the reverse link bandwidth is exceeded (or saturated), the access terminal gates the transmission of the DRC signal to the access network. In order to gate the transmission of the DRC signal to the access network, the access terminal must first know information about the quantization rate, the quantization start point (or gating), and the pilot offset. Information about the quantization rate, the quantization starting point, and the pilot offset is transmitted directly or indirectly from the access network to the access terminal via a signaling message. When information is directly transmitted to the access terminal, information regarding the quantization rate, the quantization start point, and the pilot offset determined by the access network is transmitted to the access terminal using a signal message. When information is indirectly transmitted to the access terminal, the access network transmits the quantization rate and the UDS signal index (medium access control) to the access terminal, and the access terminal then determines the quantization start point and pilot offset using information from the access network.

As illustrated in FIG. 4, each user transmits a DRC signal and a pilot signal based on information of an assigned quantization rate, a quantization starting point, and a pilot offset. More specifically, in FIG. 4, the channel-extended pilot and channel-wide DRC signal are supplied to the pilot offset part and the gate part of the DRC signal, respectively. The DRC signal gating part may consist of a switch 405, as shown in FIG. The pilot offset portion may consist of a switch 401 and a 64 chip delay element 403 for delaying the pilot signal for a predetermined chip interval, as shown in FIG. The switch 401 and the switch 405 under the control of the controller control the pilot transmit start point and the DRC signal transmission gating in accordance with the information about the quantization speed, the quantization starting point and the pilot offset received from the access network, thereby minimizing interference between the DRC signals .

5 and 6 illustrate a method for continuously transmitting a pilot signal and strobing a transmission of a DRC signal in accordance with an embodiment of the present invention. This method is divided into a method for transmitting a pilot signal with an offset and another method for transmitting a pilot signal without an offset. In the first case, when the pilot signal has an offset, users are grouped into many user groups, and the DRC signals are gated so that they must be transmitted at different time intervals in accordance with user groups, as shown in FIG. For example, the first group of users UG_1 transmits the DRC signal in the first time interval, and the second group of users UG_2 transmits the DRC signal in the second time interval. The DRC signals are transmitted at predetermined intervals determined in accordance with the quantization rate. Since user groups have different pilot transmission start points, the transmission power is evenly distributed in the time interval where the DRC signal is gated. When a particular user group receives a pilot offset of 64 chips, as shown in FIG. 5, it is possible to reduce the interference between the pilot signals from users who transmit only the pilot signal and not the DRC signal.

FIG. 6 illustrates a method for gating DRC signal transmission and continuous offset pilot transmission. In this case, when the second user transmits the DRC signal, there is no interference between the DRC signal and the DRC signal of another user, as shown in FIG.

Although FIGS. 5 and 6 show an embodiment in which the pilot signal and the DRC signal are time division multiplexed, the invention is also applicable to another case where the pilot signal and the DRC signal are code division multiplexed. That is, by gating the transmission of the DRC signal, it is possible to reduce interference for the reverse link. When the pilot signal and the DRC signal are subjected to code division multiplexing, the offset is not given in the continuous pilot signal.

Figures 7 and 8 illustrate a method for gating the transmission of a DRC signal at a quantization rate "DRC signal quantization rate" = 1/4, in accordance with an embodiment of the present invention. Specifically, FIG. 7 illustrates an embodiment in which an offset is given to pilot signals in accordance with user groups, and FIG. 8 depicts another embodiment in which an offset is not given to pilot signals. When the quantization rate is 1/4, users are divided into 4 user groups. Each user is provided with a 1/4 quantization rate and a quantization start point by means of a signal message transmitted from the access network.

Referring to FIG. 1, users in the first user group UG_1 are assigned a 1/4 quantization rate and a quantization start point (1st time interval) by means of a signal message. Similarly, users in the second group of users UG_2 are also assigned a quantization rate of 1/4 and an initial quantization point (2nd time interval). In the same method, users belonging to the third and fourth user groups are also assigned a quantization rate of 1/4 and 3rd and 4th time intervals as their starting quantization points. Users gate the transmission of the DRC signals to the access network at designated periods starting at their starting quantization points, in accordance with the assigned quantization speed and quantization starting points. In figure 3 above, the RDM is applied after half the time interval. Therefore, if the encoded packet consists of 4 time slots, as shown in FIG. 7, the DRC applies only to the first user group UG_1. Specifically, with respect to the application point of the DRC signal of each user received in the access network, the DRC signal is used, transmitted half the time interval before one encoded packet ends. That is, the DRC signal applied to the data transmitted from the access network becomes the DRC signal transmitted by the first user group UG_1. Therefore, in order for the access network to plan the DRC signal in each time interval, it is preferable to determine the forward link data rate taking into account the DRC signals of the user group applied in the corresponding time interval and the latest information of the previous user group during the period corresponding to the speed quantization before the corresponding time interval.

Although FIG. 7 shows an embodiment in which the pilot and the DRC signal are time division multiplexed, the gated transmission may also be equally applicable to another case where the pilot and the DRC signal are code division multiplexed. By strobing the transmission of the RDM signal, it is possible to reduce interference to the reverse link.

FIG. 8 illustrates a method for gating DRC signal transmission with a given quantization rate starting at a given quantization starting point, in accordance with user groups, and continuously transmitting non-biased pilot signals, as described with reference to FIG. 7. When the offset is given to the pilot signal, as shown in FIGS. 5 and 7, there is no interference with pilot signals from users in other user groups. However, there is interference with users transmitting DRC signals. When the pilot signal is not biased, the operation is the same as in a conventional VDS system, unless the transmission of the RDM signal is gated. In this case, the interference between the pilot signals may increase compared to the case where the pilot signals are offset, but the interference can be reduced in the interval where the RDM signal is transmitted.

Although FIG. 8 illustrates an embodiment in which a pilot and a DRC signal are time division multiplexed, the gated transmission may also be equally applicable to another case where a pilot signal and a DRC signal are code division multiplexed. By strobing the transmission of the RDM signal, it is possible to reduce interference to the reverse link.

In the proposed method of gated transmission of the DRC, when the throughput of the reverse link is exceeded (or saturated), each user gates the transmission of the signal of the DRC in such a way as to reduce interference between users, as well as increase the throughput of the reverse link.

In a conventional VSD system, each access terminal (TD) transmits a DRC signal at each time interval, as mentioned above, and reverse link throughput is limited. Therefore, if the number of users for the reverse link exceeds bandwidth, the new access terminal (AP) cannot receive data through the forward link. Therefore, the access terminal (TD) should increase the throughput of the reverse link by switching from the continuous transmission of the DRC signal to the gated (or quantized) transmission of the DRC signal.

When the throughput of the reverse link exceeds a predetermined initial value, the access network (AN) must determine the ratio of the power of the signal to the interference signal at other access terminals (AP). The threshold value for the error rate per frame of the _RDM signal is defined as _{RDM seR} , and the signal-to-noise ratio corresponding to the threshold value of _{RDM seR} is defined as E _b / N _{t threshold} . In addition, the reception power of the access network (ST) before the constriction of each access terminal (DT) is defined as P _ui (i = 1, ..., N), the sum of the powers of the received signals, including noise, before the constriction of each access terminal is determined as I ₀ , and the power of the DRC in the receiver of a specific access terminal (TD) is defined as E _usd $\genfrac{}{}{0ex}{}{\text{ui}}{\text{Rx}}$ . Therefore, in the process of detecting the DRC for the first user, interference is represented by I-P _ui . Therefore, the ratio of the reception power of the DRC E _usd $\genfrac{}{}{0ex}{}{\text{ui}}{\text{Rx}}$ to the value determined by subtracting the signal power P _ui from the interference I _o , including noise, of other access terminals is represented by equation (1) below. Equation (1) represents the ratio of the power of the DRC to the total interference of a particular user

A method for determining a value for switching from a continuous transmission mode of a DRC signal to a gated transmission mode of a DRC signal, i.e. standard signal-to-noise ratio E _b / N _{tmeasurement.} The DRC signal, using equation (1), is divided into two methods: the first method determines the average ratio of the reception power of the DRC of each user to the interference from other users, as Е _b / N _{tmeasurement.} and the second method determines the minimum ratio of the reception power of the DRC of each user to interference from other users, as E _b / N _tmeasurement .

Figures 9 and 10 illustrate the structure of a reverse link receiver for determining an E _b / N _{tmeasurement.} so as to switch to a gated DRC transmission mode when the reverse link throughput exceeds a predetermined initial value, in accordance with an embodiment of the present invention. Since each user has the same receiver structure, only the receiver structure of the first user will be described below with reference to FIGS. 9 and 10.

длины 4, а умножитель 1013 сужает по каналу комплексно суженный сигнал Q с помощью ортогональной функции [W $\genfrac{}{}{0ex}{}{\text{2}}{\text{4}}$ ]

длины 4. Суженный по каналу сигнал I имеет пилот-сигнал, УСД и УСОД. Экстрактор 1015 УСД выделяет сигнал УСД из суженного по каналу сигнала I и подает выделенный сигнал УСД в декодер 1019. Декодер 1019 декодирует сигнал УСД в исходный УСД. Декодер 1017 декодирует суженный по каналу сигнал Q и выводит данные трафика. Измеритель 1021 сигнала УСД измеряет мощность Е $\genfrac{}{}{0ex}{}{\text{ui}}{\text{усд}}$ приема сигнала УСД, поданного из декодера 1019. Измеритель 1025 Е_b/N_t сигнала УСД вычисляет Е_b/N_t сигнала УСД для первого пользователя "Пользователь 1" с помощью приема выходной величины I₀-Р_ui устройства 1023 вычитания и выходной величины Е $\genfrac{}{}{0ex}{}{\text{ui}}{\text{усд}}$ измерителя 1021 сигнала УСД. Часть измерения среднего Е_b/N_t сигнала УСД для измерения среднего Е_b/N_t (отношения сигнала к шуму) сигналов УСД с помощью приема отношения сигнала к шуму сигналов УСД от всех пользователей состоит из сумматора 1029 и умножителя 1031, как изображено на фиг.9. Сумматор 1029 суммирует Е_b/N_t сигналов УСД от соответствующих пользователей, а умножитель 1031 делит суммированный сигнал на число N пользователей и выводит среднее Е_b/N_t сигналов УСД. Контроллер 1035 сравнивает среднее Е_b/N_t сигналов УСД, выведенных из умножителя 1031, с заранее определенной исходной величиной для того, чтобы определить, стробировать ли сигнал УСД, а также, чтобы определить соответствующую скорость квантования.The first method will be described with reference to Fig.9. The access network receiver measures the power P _{ui of the} signal received from the first user “User 1” of the first access terminal TD1, uses I quadrator 1001, Q quadrator 1003 and adder 1005. In the same way, the power P _{ui of the} signal from other users is measured by interacting I square and Q squared. The measured signal power is supplied to the adder 1007, which measures the value of I ₀ by summing the signal power from all users. Subtractor 1023 subtracts P _ui from I ₀ , whereby I ₀ -P _ui (interference) is obtained equivalent to the value determined by subtracting this signal power from the signal power from (other) all users. I quadrator 1001, Q quadrator 1003, adder 1005, adder 1007 and subtractor 1023 constitute a “power measurement part” for measuring interference between the access terminal and other access terminals. In addition, the signals I and Q from the first user "User 1" are supplied to the complex constriction device 1009 for complex constriction. Multiplier 1011 narrows the complexly narrowed signal I along the channel using the orthogonal function [W4 ⁰ ]

of length 4, and the multiplier 1013 narrows the complex-narrowed signal Q along the channel using the orthogonal function [W $\genfrac{}{}{0ex}{}{\text{2}}{\text{4}}$ ]

length 4. Channel-narrowed signal I has a pilot signal, USD and USOD. The RDM extractor 1015 extracts the RDM signal from the signal I narrowed over the channel and supplies the selected RDM signal to decoder 1019. Decoder 1019 decodes the RDM signal to the original RDM. Decoder 1017 decodes the channel-narrowed Q signal and outputs traffic data. The USD signal meter 1021 measures the power E $\genfrac{}{}{0ex}{}{\text{ui}}{\text{usd}}$ receiving the RDM signal supplied from decoder 1019. The RDM signal meter 1025 E _b / N _t calculates the E _b / N _{t of} the RDM signal for the first user "User 1" by receiving the output value I ₀ -P _{ui of the} subtraction device 1023 and the output value E $\genfrac{}{}{0ex}{}{\text{ui}}{\text{usd}}$ meter 1021 signal RDM. The measurement part of the average E _b / N _{t of} the DRC signal for measuring the average E _b / N _t (signal-to-noise ratio) of the DRC signals by receiving the signal-to-noise ratio of the DRC signals from all users consists of an adder 1029 and a multiplier 1031, as shown in FIG. .9. An adder 1029 sums the E _b / N _{t of the} DRC signals from the respective users, and a multiplier 1031 divides the summed signal by the number N of users and outputs the average E _b / N _{t of the} DRC signals. The controller 1035 compares the average E _b / N _{t of the} DRC signals output from the multiplier 1031 with a predetermined initial value in order to determine whether to gate the DRC signal, and also to determine the corresponding quantization rate.

Then, the second method will be described below with reference to FIG. 10. The first method of FIG. 9 calculates the E _b / N _{t of} the RDM signal (or RDM reception power) by averaging the values of E _b / N _{t of the} RDM signals of the respective users, while the measurement part of the average E _b / N _{t of} the RDM signal in the second method of FIG. 10 consists of a detector 1101 minimum value (Min). The minimum value detector 1101 receives the values of E _b / N _{t of the} DRC signals of the respective users and outputs the minimum value of E _b / N _{t of the} DRC as an E _b / N _{t measure} . The controller 1035 then compares the minimum E _b / N _{t of} the DRC signal outputted from the minimum value detector 1101 with a predetermined initial value in order to determine whether the DRC signal is gated and also to determine the corresponding quantization rate.

That is, the value of E _b / N _{tmeasurement.} calculated using the method of FIG. 9 or FIG. 10 is supplied to the controller 1035. The controller 1035 performs the operation of the algorithm for determining the quantization speed of FIG. 11 by receiving the value of E _b / N _tmeasurement .

11 illustrates a procedure for determining the quantization rate of a DRC signal by measuring the intensity of a signal received from each user in an access network, in accordance with an embodiment of the present invention. Referring to FIG. 11, an access network controller (AN) 1035 receives a standard signal-to-noise ratio E _b / N _{tmeasurement.} the DRC signal calculated in FIGS. 9 or 10. Thereafter, in step 1101, the controller 1035 compares the standard signal-to-noise ratio E _b / N _{tmeasurement.} signal RDM with E _b / N _{t threshold} + Δ. If E _b / N _{tmeasurement.} greater than E _b / N _tpog + Δ, the controller 1035 proceeds to step 1111, and otherwise proceeds to step 1103. At step 1103, the controller 1035 compares the E _b / N _{t measurement.} with E _b / N _tpopog - δ ₂ . If E _b / N _{tmeasurement.} greater than the E _b / N _threshold - δ ₂ , the controller 1035 sets the quantization rate to 1/2 in step 1107. Otherwise, the controller 1035 proceeds to step 1105. At step 1105, the controller 1035 determines whether the E _b / N _{t measurement is} greater _. than E _b / N _tpopog - δ ₃ . If E _b / N _{tmeasurement.} greater than E _b / N _t - _threshold is δ ₃ , the controller 1035 sets the quantization rate to 1/4 in step 1109. If the condition of step 1105 is not satisfied, the controller 1035 re-performs the same process, while changing the error margin Δ. Here, since one frame consists of 16 time intervals, the quantization rate can be set to 1/16. For example, with respect to a block of data transmitted from an access terminal to an access network, data is transmitted in a block of an encoded packet consisting of 32 time slots. Since the access network is synchronized in frames with the access terminal, the possible maximum quantization rate is 1/16, and the initial quantization point can also become one of 16 positions.

Δ, δ ₂ and δ ₃ indicate the limits of error. After determining the quantization rate by the above process, the controller 1035 determines in step 1111 the quantization rate, the quantization start point, and the pilot offset for each access terminal using information from the reverse link data rate and the quantization rate received from the access terminal (AT). In addition, the controller 1035 groups the reverse link DRC signals according to a determined quantization rate. At step 1113, the controller 1035 generates a signal message including a quantization rate, a quantization start point, and a pilot offset, and transmits the generated signal message to the corresponding access terminals (APs). After transmitting the signaling message, the controller 1035 performs the above process again for the next time interval in step 1115.

The alarm message has the following format. For example, a signaling message is implemented using a reserved field of an existing traffic channel allocation message. That is, it is possible either to implement a control message for quantizing the DRC signal using a previously defined message, or to establish a new message. The traffic channel allocation message has the format shown in Table 3 below.

In the format of a conventional traffic channel allocation message, Table 3, the field “quantized signal of the DRC signal” of the mode of quantized transmission of the DRC signal, the field “speed of quantization of the DRC signal” of the quantization speed, the field “initial quantization point of the DRC signal” of the initial quantization point of the DRC signal, and the “offset” field Pilot "pilot offsets are added for the quantized transmission of the DRC signal. Each field will be described in detail below.

The "quantized DRC signal mode" field records whether to gate the reverse DRC signal;

"DRC quantized signal mode" = ’0’ indicates the continuous transmission mode of the DRC signal;

"RDM quantized signal mode" = ’1’ indicates a quantized RDM signal transmission mode.

The "RDM signal quantization rate" field records the quantization speed of the reverse RDM signal;

"RDM signal quantization rate" = ’00’ indicates 1/2 quantization rate;

"RDM signal quantization rate" = ’01’ indicates a 1/4 quantization rate;

"the quantization speed of the signal RDM = ’10’ indicates the quantization speed 1/8;

"RDM signal quantization rate" = ’11’ indicates a 1/16 quantization rate.

The "RTD signal quantization start point" field records the initial time interval where the DRC signal is first transmitted when the reverse DRC signal is quantized;

"start quantization point of the DRC signal" = ’0000’ indicates the 1st time interval;

"start quantization point of the DRC signal" = ’0001’ indicates the 2nd time interval;

"start quantization point of the DRC signal" = ’0010’ indicates the 3rd time interval;

"start quantization point of the DRC signal" = ’1110’ indicates the 15th time interval;

"start quantization point of the DRC signal" = ’1111’ indicates the 16th time interval.

The Pilot Offset field records whether to apply the offset when transmitting the reverse pilot;

“pilot offset” = ’0’ indicates that the offset is not applied;

“pilot offset” = ’1’ indicates that the offset is applied.

Table 4 below shows the fields added to control the quantization of the DRC signal in an existing channel allocation message. As shown in Table 4, it is also possible to transmit only fields for controlling the quantization of the DRC signal through a channel allocation message. That is, Table 4 depicts the format of the message used when transmitting only the RDM signal quantization control message instead of retransmitting the channel allocation message. In Table 4, the Message ID field is used to identify the quantization control message.

The signal messages of Tables 3 and 4 transmit the “USD quantized signal mode” = ’0’ for the RDM continuous signal transmission mode, and the “RDM quantized signal mode” = ’1’ for switching to the quantized RDM signal transmission mode. In order to provide service to a new subscriber, the field "mode of the quantized signal RDM" is set to 1 ’.

12 illustrates a procedure for switching from a quantized transmission mode of a reverse link DRC signal to a continuous transmission mode of a DRC signal when reverse link throughput improves due to a decrease in the number of users, in accordance with an embodiment of the present invention.

Referring to FIG. 12, the controller 1035 determines in step 1201 whether the condition is satisfied

If the condition is satisfied, the controller 1035 switches from the quantized RDM transmission mode to the continuous RDM transmission mode at step 1203. Here, "δ ₁ " indicates the limit of the boundary value where the switching from the quantized RDM transmission mode to the continuous RDM signal transmission mode occurs.

After switching from the DRC quantized transmission mode to the DRC continuous signal transmission mode in step 1203, the controller 1035 informs the access terminal (TD) about switching to the DRC continuous signal transmission mode through the channel allocation message of table 3 or 4 in step 1205. However, if the condition is not satisfied in step 1201, the controller 1035 determines in step 1207 whether the condition is satisfied

If the condition is satisfied, the controller 1035 switches to the DRC signal transmission mode with a quantization speed = 1/2 in step 1209. However, if the condition is not satisfied in step 1207, the controller 1035 switches to the DRC signal transmission mode with a 1/4 quantization speed in step 1213 After the mode switch, the controller 1305 informs the access terminal of the switched transmission mode through the channel allocation message of table 3 or 4 in step 1211. After steps 1205 and 1211, the controller 1035 performs the same process again for the next time interval in step 1215. Meanwhile, after receiving a message from Table 3 or 4, the access terminal performs the procedure of FIG.

For a better understanding of the invention, a process for switching from a continuous transmission mode to a quantized transmission mode and from a quantized transmission mode to a continuous transmission mode will be described in detail with reference to FIG.

FIG. 13 illustrates boundary values for switching from a continuous DRC signal transmission mode to a quantized DRC signal transmission mode due to a decrease in reverse link throughput, or from a quantized DRC signal transmission mode to a continuous DRC signal transmission mode due to improved reverse link throughput. communication.

As illustrated, reference number 13-1 indicates a change in the error amount of the RDM symbols in accordance with the E _b / N _{tmeasurement.} , and the reference number 13-3 indicates the border E _b / N _tpop corresponding to the preferred error rate of the characters of the RDM in the access network. Reference number 13-2 indicates the boundary where the quantization rate changes from 1/4 to 1/2, and the power of the RDM signal corresponding to this boundary becomes E _b / N _{t threshold} - δ ₂ . For example, if the value of E _b / N _{tmeasurement.} measured in the access network is greater than E _b / N _t - _threshold - δ ₂ and less than E _b / N _t-threshold , the quantization rate is set to 1/2. However, if the measured value of E _b / N _{tmeasurement.} less than Е _b / N _tpopog - δ ₂ , the quantization rate is set to 1/4. Thus, it is possible to change the quantization rate in accordance with the measured reverse link throughput.

In addition, reference number 13-4 indicates a boundary for switching from a continuous DRC signal transmission mode to a quantized DRC signal transmission mode if the reverse link throughput is exceeded. The signal-to-noise ratio (or reception power) of the DRC signal corresponding to this boundary becomes E _b / N _{t threshold} + Δ. That is, if E _b / N _{tmeasurement.} less than E _b / N _tpopog + Δ, there is a switch from the continuous transmission mode of the RDM to the mode of quantized transmission of the RDM signal. In addition, reference number 13-5 indicates the boundary for switching back to the continuous transmission mode of the RDM signal if the throughput of the reverse link is less than the initial value in the mode of quantized transmission of the RDM signal. The signal-to-noise ratio of the DRC signal corresponding to this boundary becomes E _b / N _tpopog + Δ + δ ₁ . In this case, if E _b / N _{tmeasurement.} more than E _b / N _{t threshold} + Δ + δ ₁ , switching to continuous transmission of the signal RDM.

As mentioned above, the switch from the continuous transmission mode of the DRC signal to the mode of quantized transmission of the DRC signal occurs at the point where Е _b / N _{t is a measure.} less than E _b / N _tpopog + Δ. In addition, in the mode of quantized signal transmission RDM, if E _b / N _{tmeasurement.} more than E _b / N _tpopog - δ ₂ , but less than E _b / N _tpopog + Δ, the quantization rate is set to 1/2; if E _b / N _{tmeasurement.} less than E _b / N _tpop - δ ₂ + δ ₁ E _b / N _tpop - δ ₂ , the quantization rate is set to 1/4. Here, δ ₂ indicates the limit for changing the quantization rate in 1/4.

In addition, the point where there is a switch from the quantized transmission mode of the DRC signal back to the continuous transmission mode of the DRC signal due to improved throughput of the reverse link is as follows. In the case where Е _b / N _{tmeasurement.} has a limit for increasing the data rate if the number of reverse link users decreases, improving the throughput of the reverse link, although the user selects the quantized transmission mode for the reverse link, because measured E _b / N _tmeasure. turns out to be less than Е _b / N _tpopog + Δ + δ ₁ , switching occurs back to the continuous transmission mode. In this case, if E _b / N _{tmeasurement.} more than Е _b / N _tpopog + Δ + δ ₁ , the switching from the mode of quantized transmission of the DRC signal to the mode of continuous transmission of the DRC signal occurs. Here, δ ₁ indicates the limit of the boundary value, where the switching from the quantized transmission mode of the DRC signal to the continuous transmission of the DRC signal occurs.

FIG. 14 illustrates a procedure for detecting a quantization rate of a DRC signal by analyzing a signal message from an access network in an access terminal in accordance with an embodiment of the present invention.

Referring to FIG. 14, after receiving a signal message from the access network (ST) in step 1401, the access terminal (TD) detects in step 1403 the DRC signal cant transmission mode “DRC quantized signal mode”, the quantization start point, “DRC start point”, the quantization rate "DRC signal quantization rate" and the pilot offset "pilot offset" from the received signal message, or determines the quantization start point "DRC start point" and the pilot offset "pilot offset" using the quantized signal transmission mode of the RDM signal "the quantized signal of the RDM signal", the UDS signal index "the UDS signal index" and the quantization rate "the RDM signal quantization rate" included in the channel allocation message. After the above information is detected, the access terminal (AT) further determines in step 1403 whether the DRC signal is quantized (“quantized DRC mode” = 1) based on the quantized transmission mode information “quantized DRC signal mode” detected from the channel allocation message. If the "DRC quantized signal mode = 1", the access terminal (TD) gates the transmission of the DRC signal in accordance with the detected quantization start point and quantization speed in step 1405. After that, the access terminal (TD) determines in step 1407 whether to transmit the pilot signal with an offset (“pilot offset” = 1), based on the pilot offset information “pilot offset” included in the channel allocation message. If the pilot signal has an offset (ie, “pilot offset” = 1), the access terminal (AT) transmits the pilot with an offset, as shown in FIGS. 5 and 7, in step 1409. If the “quantized signal mode DRC = 1 "in step 1403 or if" pilot offset "= 1 in step 1407 or after transmitting the pilot signal with offset in step 1409, then the access terminal (AP) is prepared to control the next time interval in step 1411.

In an embodiment of the present invention, the reverse link signal is gated (or quantized) in order to improve the detection ability of the access network DRC signal. As another way to reduce feedback due to the DRC signal, the IRR system transmits the same DRC signals at least 2 consecutive time intervals with a transmit power less than the transmit power of the pilot signal. Next, the case where the output signal transmission RDM less, will be described in detail.

15 illustrates a method for retransmitting the same DRC signals in an IRR mobile communication system in accordance with an embodiment of the present invention. As illustrated, the number of repeated time intervals is 4. Therefore, the access terminal (TD) transmits the same DRC signals through 4 time intervals in accordance with the number of repeated time intervals determined by the access network. At this point, the DRC signal is transmitted with a transmit power less than the transmit power of the pilot signal. That is, the same DRC signals are transmitted over 4 consecutive time intervals with 25% of the pilot transmission power, thereby reducing interference due to the DRC signal transmitted by the access terminals on the reverse link. The access network requests one DRC signal, having the same power as the power of the reverse pilot signal, by accumulating DRC signals received in 4 time intervals. That is, the requested RDM signal has sufficient power required for demodulation.

Although FIG. 15 depicts a case where the same DRC signals are transmitted in 4 consecutive time intervals, the same method can also be applied to another case where the same DRC signals are transmitted in a predetermined number of consecutive intervals . For example, the number of repeated time intervals may be 1, 2 or 4, as shown in table 5 below. In addition, information about the number of consecutive intervals where the same information about the DRC signal is transmitted, and information about the transmit power for information about the DRC signal is transmitted from the access network to the access terminal via a signal message. Alternatively, the access network transmits information about the number of repeated time intervals, and the access terminal then determines the transmit power for the DRC signal information using information received from the access network.

For example, if the repetition rate of the same DRC signals is 4, the transmit power for each DRC signal is set to 25% of the pilot transmit power, as shown in Table 5.

A method for transmitting the same DRC signals in 2 or more consecutive time intervals with reduced transmit power can also be applied to the quantized DRC signal transmission mode described in the implementation of the present invention. In this case, one or more of the same DRC signals are quantized, and the transmit power for the non-quantized DRC signals is set equal to or less than the transmit power of the pilot signal.

16 illustrates a method for quantizing at least one of the same DRC signals in a mobile communication system that retransmits the same DRC signals, in accordance with an embodiment of the present invention. As illustrated, the number of repeated time intervals is 4. Therefore, the access terminal (AP) transmits the same DRC signals over an interval of 4 time intervals. In this case, the access terminal quantizes the DRC signals in even numbered time intervals (i.e., the 2nd and 4th time intervals) and transmits only the pilot signals in the oddly numbered time intervals. In addition, the transmit power of the DRC signals transmitted at odd numbered time intervals (i.e., the 1st and 3rd time intervals) is adjusted to be less than the transmit power for the pilot signals. For example, the transmit power for the DRC signals is adjusted to 50% of the transmit power for the pilot signals. That is, the DRC signals of two time intervals from 4 consecutive time intervals transmitting the same DRC signals are quantized, and the DRC signals of the other two time intervals are transmitted with a transmit power less than the transmit power of the pilot signals.

That is, in another embodiment of the present invention, when the reverse link capacity is exceeded, the access terminal transmits the same DRC signals in two or more consecutive time intervals with a transmit power less than the transmit power of the pilot signal. In order to retransmit the DRC signals to the access network, the access terminal must first know the number of time intervals where the same DRC signals are repeated, and the transmit power for the DRC signals. Information about the number of time intervals where the same DRC signals are repeated, and information about the transmit power for the DRC signals are transmitted from the access network to the access terminal through a signal message. Alternatively, the access network transmits information about the number of repeated time intervals of the DRC signals, and the access terminal then determines the transmit power of the DRC signals using information supplied from the access network.

17 illustrates the structure of a reverse link transmitter in accordance with an embodiment of the present invention. Specifically, FIG. 17 illustrates an apparatus for reducing transmit power of DRC signals below transmit power of pilot signals when transmitting the same DRC signals in two or more consecutive time intervals.

As illustrated, the transmitter of FIG. 17 is similar in structure to the transmitter of FIG. 1, with the exception of the structure of the DRC signal transmitter. Therefore, reference will only be made to the transmitter signal RDM in the following description.

Block (8, 4, 4) encoder 117 performs block coding (8, 4, 4) with respect to 4-bit information about the DRC signal. In this embodiment, a block (8, 4, 4) encoder 117 re-encodes the same 4-bit DRC signal information a predetermined number of times under the control of a controller. The codeword repeater 119 repeats the codeword derived from the block (8, 4, 4) encoder 117 a predetermined number of times. Multiplier 121 orthogonally expands the output of the codeword repeater 119 by multiplying it by a predetermined Walsh code W $\genfrac{}{}{0ex}{}{\text{2}}{\text{0}}$ length 2. The Walsh coverage generator 113 outputs the Walsh coverage by receiving the Walsh coverage index of the RDM signal. A multiplier 123 multiplies the output of the multiplier 121 by the output of the Walsh coverage generator 113. The DRC signal gain controller 1700 controls the gain of the output of the multiplier 123. For example, when the same DRC signals are repeated 4 times in an interval of 4 time intervals, the DRC signal gain controller 1700 adjusts the transmit power for the DRC signals at 25% of the transmit power for the pilot -signal. A multiplier 125 multiplies the output of the RCD signal amplification controller 1700 by a predetermined orthogonal code W $\genfrac{}{}{0ex}{}{\text{4}}{\text{0}}$ and outputs the signal channel RDM. In order to switch from the repeated transmission mode to the quantized transmission mode, i.e. in order to support the transmission method of FIG. 21, which will be described later, a gating device (switch 405 of FIG. 4) may be provided between the DRC signal amplification controller 1700 and the multiplier 125. After receiving the command, switch from the current repeated transmission mode to the quantized mode transmitting from the access network, the access terminal quantizes at least one of the repeated DRC signals by controlling the gating device.

In addition, the access terminal also re-adjusts the gain of the RDM signal using the RDM signal gain controller 1700. That is, the access terminal adjusts the gain of the DRC channel signals so that the transmit power determined by accumulating the same DRC channel signals in the access network should be equal to the transmit power of the pilot signal.

As described above, each user transmits the DRC signals and pilot signals based on information about the number of time intervals of the repeated DRC signals and information about the transmit power for the DRC signals, that is, information supplied from the access network. The channel-wide DRC channel signal is supplied to the gain controller 1700 of the DRC signal. The DRC signal amplification controller 1700 controls the transmit power of the DRC signals based on the transmit power of the DRC signal information, determined depending on the number of time intervals where the same DRC signal information is repeated. By controlling the transmit power of the DRC signals, it is thus possible to reduce interference between the DRC signals from users.

Even in a method for transmitting the same DRC signals in two or more consecutive time intervals with a transmit power less than the transmit power of the pilot signal, it is possible to reduce the interference between the pilot signals using the offset of the pilot signal in the reverse link. In this case, whether to set the pilot offset can be directly reported to the access terminal using a predetermined signaling field, or can be indirectly determined at the access terminal using the index of the MAC signal assigned by the access network. For example, the pilot offset is set according to whether the MAC index is an even number or an odd number.

FIG. 18 illustrates a procedure for switching from an existing continuous transmission mode of DRC signals to a transmission mode for transmitting the same DRC signals at least 2 consecutive time intervals with a transmit power less than the transmit power of the pilot signal when calculated by the access network by measuring the signal transmitted from each user exceeds the throughput of the reverse link in accordance with an embodiment of the present invention.

Referring to FIG. 18, an access network (AN) compares the value of E _b / N _{tmeasurement.} , measured in figure 9 or _figure 10, with E _b / N _tpopog + Δ at step 1801. If E _b / N _{tmeasurement.} larger than E _b / N _tporog + Δ, the access network proceeds to step 1811, and otherwise proceeds to step 1803. The access network compares E _b / N _tizmer. with Е _b / N _t - _threshold - δ ₂ at step 1803. If Е _b / N _tmeasured. greater than E _b / N _t - _threshold - δ ₂ , the access network determines whether to retransmit the reverse DRC signals twice with 50% of the pilot transmit power, in step 1807, and then proceeds to step 1811. Otherwise, the access network proceeds to step 1805. The access network compares the E _b / N _{tmeasurement.} with Е _b / N _tthreshold - δ ₃ at step 1805. If Е _b / N _tmeasured. more than Е _b / N _tthreshold - δ ₃ , the access network determines whether to retransmit the DRC signals four times with 25% of the transmit power of the pilot signal, at step 1809, and then proceeds to step 1811. That is, if the repetition rate of that the same DRC signal is N, the transmit power of the DRC signal becomes 1 / N times the transmit power of the pilot signal. Here Δ, δ ₂ and δ ₃ indicate the limits of error. After determining the repetition rate of the DRC signal and the transmit power in this way, the access network assigns a decoder in accordance with the determined repetition frequency of the DRC signal and the determined transmit power in step 1811. After that, in step 1813, the access network transmits a signal message to the access terminal (AP) including RDM signal repetition rate and transmission power information. Then, the access network collects the received DRC signals in accordance with the repetition rate, and then determines the reception power of the DRC signals in step 1815.

On Fig-18, the frequency of the repetition of the signals of the RDM and the transmit power of the RDM are determined after measuring interference in the reverse link. However, alternatively, it is also possible to reduce interference to the reverse link by reducing the transmit power of the DRC signals below the transmit power of the pilot signal if the same DRC signals are transmitted in successive time intervals before applying the above method. That is, when the repetition rate of the DRC signals "DRC signal duration" is 2 or 4, it is possible to reduce interference to the return link by reducing the transmit power of the DRC signals below the transmit power of the pilot signal. For example, before applying the method of transmitting the same DRC signals for at least 2 consecutive time intervals with a reduced transmit power of the DRC signals, if the same DRC signals were previously transmitted in the interval N of consecutive time intervals, it is possible to reduce the interference to the reverse link by reducing the transmit power of the DRC signals by 1 / N times the transmit power of the pilot signal. In other words, when the DRC signals are retransmitted with the same transmit power as the transmit power of the pilot signal, the transmit power of the DRC signals can be adjusted to be less than the transmit power of the pilot signal through a signaling message during transmission. In addition, during the repeated transmission of the DRC signals, the access network can also send a quantized transmission command to the access terminal via a signaling message. For example, if the return interference increases to exceed a threshold during repeatable DRC signaling, the access network may instruct the access terminal to quantize the DRC signaling. In this case, the access terminal determines the quantization speed "RDM signal quantization rate" by inverting the repetition frequency "DDM signal strength of the RDM signal assigned by the access network during call setup. Method of controlling the quantized transmission of RDM signals using the RDM signal repetition frequency" RDM signal duration "will be described below.

FIG. 19 illustrates a procedure for informing an access terminal of a quantization rate through a signaling message in an access network in accordance with an embodiment of the present invention. Referring to FIG. 19, the access network determines the frequency of the DRC signal repetition “DRC signal duration”, and also determines the quantization speed “DRC signal quantization speed” by inverting the frequency of the DRC signal repetition “DRC signal duration” at step 1901. The quantization speed “speed quantization of the USD signal "is equal to the reciprocal of the frequency of the USD signal repetition" the duration of the USD signal ". Table 6 below depicts the quantization rate "quantization speed of the DRC signal" associated with the repetition frequencies "duration of the DRC signal" indicating the number of time intervals where the same information about the DRC signal is retransmitted.

After that, in step 1903, the access network creates a signal message including the medium access control signal (MAC) index ("MAC index"), the quantized transmission mode "DRC quantized signal mode" (continuous transmission mode or quantized transmission mode), and the quantization rate " RDM signal quantization rate "(or" RDM signal duration ") of the respective access terminals. At step 1905, the access network transmits the generated signaling message to the access terminal.

FIG. 20 illustrates a procedure for determining a quantization rate and a quantization starting point for quantized transmission of reverse DRC signals using information included in a received signal message in an access terminal. The signal message, including the UDS signal index "UDS signal index" and the RDM signal repetition rate "Duration of the RDM signal", is transmitted to the access terminal during initial access to the system. While retransmitting the DRC signals, in accordance with the repetition rate of the DRC signals included in the signal message, after receiving a quantized transmission command from the access network, the access terminal performs a quantized transmission in accordance with the quantization speed “DRC signal quantization rate” determined from by inverting the frequency of the repetition of the signal RDM "signal duration RDM.

Referring to FIG. 20, the access terminal receives a signal message including the UDS signal index “UDS signal index” and the UDS signal repetition frequency “Duration of the RDM signal” from the access network in step 2001. After receiving the RDM signal repetition rate “Duration of the RDM signal” the access terminal determines the quantization rate "quantization speed of the DRC signal" by inverting the frequency of the repetition of the DRC signals "the duration of the DRC signal". However, when the quantization rate “RDM signal quantization rate” is adopted, the access terminal determines the RDM signal repetition rate “RDM signal duration” by inverting the quantization rate “RDM signal quantization rate”. That is, it is required that the access network provide the access terminal with either a quantization rate of "RDM signal quantization rate" or a repetition rate of "RDM signal length". Thereafter, in step 2003, the access terminal calculates a quantization period using the determined quantization rate “RDM signal quantization rate”. The quantization period is equal to the inverse of the quantization speed "quantization speed of the signal RDM". Therefore, the repetition frequency of the DRC signals has the same meaning as the quantization period. In step 2005, the access terminal calculates an index value that is equivalent to the remainder obtained by dividing the assigned index of the MAC signal (or coverage index of the MAC signal) by the quantization period. The access terminal determines in step 2007 whether the determined index value is equal to '0'. If the index value is '0', the access terminal determines the quantization start point “initial quantization point of the DRC signal” of DRC signals subjected to quantized transmission as the initial time interval of one frame in step 2009. Otherwise, the access terminal determines in step 2011 whether the value is index '1'. If the index value is '1', the access terminal determines the quantization start point “initial quantization point of the DRC signal” of DRC signals subjected to quantized transmission as the second time interval of one frame in step 2013. After repeating this process, the access terminal determines in step 2015, whether the value of the index is 'N-2'. If the index value is 'N-2', the access terminal determines the quantization start point “initial quantization point of the DRC signal” of DRC signals subjected to quantized transmission as the (N-1) th time interval of one frame, at step 2019. Otherwise, the access terminal defines the quantization start point as the Nth time interval of one frame in step 2017. For example, when the quantization speed is 1/4 ("RDM signal quantization speed" = 1/4), the quantization period becomes 4 (= 1 / "signal quantization speed "", And when the access terminal is assigned an KS 27, it starts transmitting DRC signals after passing 3 time intervals from the starting point of one frame.

19 and 20, the quantized transmission mode is applied to the case where the same DRC signals are retransmitted in two or more consecutive time intervals. However, even in the continuous transmission mode of the DRC signals, the access network determines the quantization rate by measuring the interference of the reverse link using the procedures of FIGS. 9 and 10 and provides information of the determined quantization speed to the access terminal, and the access terminal then calculates the initial time interval of one frame for the quantized transmission DRC signals by performing steps 2001 to 2019 of FIG.

Although FIG. 20 depicts how an access terminal determines an initial time interval of a DRC signal within a single frame, it is also possible to determine whether to set a pilot offset using the same method. In this case, the offset is set for the pilot signal according to whether the remainder obtained by dividing the index of the MAC signal assigned to the access terminal by the quantization period is an odd number or an even number. In addition, it is also possible to decide whether to set the offset of the pilot signal according to whether the remainder obtained by dividing the index of the MAC signal assigned to the access terminal is greater by the quantization period than the threshold value. For example, for the quantization speed 'the quantization speed of the signal RDM = 1/4 ", if the remainder is less than 2, the pilot offset is set. Otherwise, if the remainder is greater than or equal to 2, the pilot offset is not set.

Although the invention has been described with reference to an implementation, where the access terminal determines the quantization starting point of the DRC signal "the starting point of the DRC signal" and whether to set the pilot offset "pilot offset" using the quantization speed of the DRC "signal quantization rate RDM "and UDS signal index" UDS signal index ", it is also possible for the access network to determine the quantization rate of the RDM signal and the UDS signal index and transmit them to the access terminal using a signal message. In this case, the access network measures the power levels of the interference signals generated by the respective user groups from the received feedback signals, determines the starting point for transmitting the DRC signal so that the starting quantization point of the DRC signal is “the starting point of the DRC signal” and the UDS signal index is “UDS signal index” must belong to the group of users generating the least interference power, and transmits this information to the access terminal through a signaling message. In this case, whether to set the offset of the pilot signal can be determined in accordance with the starting quantization point "the starting point of the DRC signal" and the group of users to which the access terminal belongs. In addition to the method where the access network determines the initial time interval for transmitting the DRC signal "the starting point of the DRC signal" and the pilot offset "pilot offset" and transmits them to the access terminal, the access network can also calculate the number of users in the received user group, and then transmit the initial time interval for transmitting the DRC signal and the pilot offset of the user group having the least number of users to the access terminal.

FIG. 21 illustrates a starting point for applying DRC signal information in a transmission method in which the quantized transmission mode “DRC signal length” = 4 is applied in accordance with an embodiment of the present invention. In this case, the DRC signal information is applied to the forward link half the time interval after the information of each user group in the access network is received. That is, the access network applies information to the forward link after receiving information about the DRC signal belonging to each user group transmitted in the same quantization interval (4 time intervals). Although FIG. 21 depicts a case where the access network applies the DRC information to the forward link after receiving the DRC information of each user group transmitted in the same quantization interval (4 time intervals), the access network can also determine the forward data rate communication lines, using the latest received information about the signals of the DRC of the corresponding user groups, before receiving information about the signals of the DRC of each group of users transmitted in the same quantization interval (4 time intervals).

Although FIG. 21 illustrates the application of a quantized transmission mode for a case where the same information about the DRC signals is repeated 4 times (“DRC signal duration” = 4), the quantized transmission mode can also be applied even when the same the same information is repeated N times. When the repetition rate "DRC signal duration" = N, the quantization speed becomes "DRC signal quantization speed = 1 / N, and the access network applies the DRC signal information to the forward link after receiving all of the DRC signal information transmitted in the same interval quantization (N time slots). Even in this case, it is possible to reduce interference in the reverse link by applying pilot offset in the same way.

FIG. 22 illustrates the application of the DRC signal start point information in a transmission method in which “DRC signal length” = 2 quantized transmission modes, in accordance with an embodiment of the present invention. In this case, the DRC signal information is applied to the direct communication line for half the time interval after the DRC signal information of each user group is received in the access network. That is, the access network applies the DRC signal information to the forward link after receiving the DRC signal information belonging to each user group transmitted in the same quantization interval (2 time intervals). Although FIG. 22 depicts a case where the access network applies the DRC signal information to the forward link after receiving the DRC signal information of each user group transmitted in the same quantization interval (2 time intervals), the access network can also determine forward link data rate using the last received information about the DRC signal of the corresponding user groups before receiving information about the DRC signal of each user group transmitted in the same quantization interval (2 int time gap).

23 illustrates a method in which an access network receiver applies the DRC signal information to a forward link at a given point in a quantization interval before receiving DRC signal information of each user group corresponding to the same quantization interval (4 time intervals), in accordance with the implementation of the present invention. When the DRC signals are quantized, the access network may receive the DRC signal information or may not receive the DRC signal information for a certain period of time. For unaccepted information about the DRC signal of a group of users, the access network determines the data rate of the forward link using the last received information about the DRC signal. In this state, the access network received only information about the DRC signal from the first and second groups of users UG1 and UG2 in the quantization interval n + 1 of the DRC signal of the access terminal, but did not receive information about the DRC signal from the third and fourth groups of users UG3 and UG4 in the quantization interval n +1 In this case, the access network determines the data rate of the forward link using the last received DRC information, i.e. information about the DRC signal in the quantization interval n. That is, the access network selects the access terminal that is supposed to receive direct line data by comparing the information about the DRC signals from the user groups UG3 and UG4 received in the nth interval with the information from the user groups UG1 and UG2 adopted in (N + 1) th interval, and then transmits data to the selected access terminal with a specific data rate.

Although FIG. 23 depicts a case where the access network cannot receive information about the DRC signals from the third and fourth user groups UG3 and UG4, the invention may also be equally applicable to the case where the access network cannot receive information about the DRC signals from other user groups. In addition, the invention may be applicable to the case where the number of user groups is not equal to 4.

Although the invention has been described with reference to an implementation where the pilot and DRC signals are time division multiplexed, the invention can also be applied to the case where the pilot and DRC signals are code division multiplexed.

24 illustrates an example of a quantized transmission mode for a case where a pilot signal and a DRC signal are code division multiplexed in accordance with an embodiment of the present invention. Specifically, FIG. 24 illustrates a transmission method in which “RDM signal quantization rate” = 1/4 of a quantized transmission mode, where the same RDM signal information is repeated 4 times = 1/4 of a quantized transmission mode, where the same information about DRC signals is repeated 4 times ("DRC signal duration" = 4). In this case, since the pilot signal and the DRC signal are time division multiplexed, it is not necessary to assign an offset for the pilot signal. Therefore, when the quantized transmission mode is applied, the access terminal continuously transmits DRC signals without time division multiplexing with pilot signals using all of the 2048 chips in the time interval designated by the access terminal itself. A quantization in which one of the four time intervals has the same information is determined using a signaling message transmitted from the access network.

25 illustrates the structure of a reverse link transmitter for transmitting a pilot signal and a DRC signal based on code division multiplexing in accordance with an embodiment of the present invention.

Referring to FIG. 25, Walsh orthogonal modulator 2601 performs n-ary orthogonal modulation with respect to the reverse link rate indicator (RCD) and outputs a symbol. A symbol repeater 2602 (or a codeword repeater) will repeat the symbol output from the Walsh orthogonal modulator 2601 a predetermined number of times. A time division multiplexer 2603 multiplexes in time the output of a symbol repeater 2602 with pilot data of all zeros (or all units) in accordance with a predetermined rule. The point signal converter 2604 converts the data output from the time division multiplexer 2603 to +1 or -1. Multiplier 2605 orthogonally expands the output of the point signal converter 2604 by multiplying it by a predetermined Walsh code W $\genfrac{}{}{0ex}{}{\text{16}}{\text{0}}$ . A gain controller 2606 under the control of the controller controls the gain of the output of multiplier 2605.

Biorthogonal encoder 2607 performs biorthogonal encoding of input information about the signal RDM. The codeword repeater 2608 repeats the codeword derived from the biorthogonal encoder 2607 a predetermined number of times. The point signal converter 2609 converts the data output from the codeword repeater 2608 to +1 or -1. The Walsh coverage generator 2614 outputs the Walsh coverage for sector division by receiving the Walsh coverage index of the DRC. A multiplier 2610 multiplies the output of the point signal converter 2604 by the output of the Walsh coverage generator 2614. Multiplier 2611 orthogonally expands the output of multiplier 21610 by multiplying it by a predetermined orthogonal code W $\genfrac{}{}{0ex}{}{\text{16}}{\text{0}}$ . The switch 2612 under the control of the controller gates the output signal of the multiplier 2611. The gain controller 2613 controls the gain of the output signal of the switch 2612. The adder 2615 sums the output signals of the gain controllers 2606 and 2613.

A repeater 2616 bits repeats the data of the acknowledgment signal (AC) a predetermined number of times. The point signal converter 2617 converts the data output from the 2616 bit repeater to +1 or -1. Multiplier 2618 orthogonally expands the signal output from the point signal converter 2617 by multiplying it by a predetermined orthogonal code. A gain controller 2619 controls the gain of the output of multiplier 2618.

Encoder 2620 encodes the input traffic data, and a signal interleaver 2612 interleaves the output of the signal encoder 2620. The interleaved packet repeater 2622 repeats the interleaved packet data output from the signal interleaver 2621 a predetermined number of times. The point signal converter 2623 converts the data output from the repeater 2612 of the interleaved packet to +1 or -1. Multiplier 2624 orthogonally expands the signal output from the point signal converter 2623 by multiplying it by a predetermined orthogonal code W $\genfrac{}{}{0ex}{}{\text{4}}{\text{2}}$ . A gain controller 2625 controls the gain of the signal output from the multiplier 2624. An adder 2626 sums the output signals of the gain controllers 2619 and 2625. The modulator 2627 modulates the output signals of the adders 2615 and 2626. The filter 2628 filters the output signal of the modulator 2627 on the main frequency band. The filtered signal is converted into an RF signal by upconverting, and then transmitted to the access network.

Fig. 26 illustrates a structure of a forward link transmitter in accordance with an embodiment of the present invention. The transmitter consists of a traffic signal transmitter, a header transmitter, a UDS signal transmitter, and a pilot signal transmitter.

First, relative to the traffic signal transmitter, encoder 2701 encodes forward traffic channel data. For example, a convolutional encoder or turbo encoder having a code rate of R = 1/3 or 1/5 is typically used for encoder 2701. Encryption code generator 2702 generates an encryption code to encrypt traffic data, and encryption device 2703 encrypts the output of encoder 2701 by executing relative to it together with the output signal of the generator 2702 encryption code of the logical operation of the exclusive OR. An interleaver 2704 interleaves the output of the encryption device 2703. A modulator 2705 modulates the output of the interleaver 2704 and outputs an interleaved symbol. Modulator 2705 serves as a KFM modulator (quadrature phase shift keying), an 8-FM modulator (8 phase shift keying), or a 16-QAM modulator (16 quadrature amplitude modulation). The symbol repeater 2706 repeats the output of the modulator 2705 a predetermined number of times. A 2707 symbol demultiplexer (DM) de-multiplexes the output of the symbol repeater 2706 into the N available Walsh code signals. The Walsh coverage hex generator 2708 orthogonally expands the N output signals of a 2707 symbol demultiplexer. A Walsh signal amplification controller 2709 controls the amplification of the output signals of the Walsh discovery hex generator 2708. A Walsh chip level adder 2710 summarizes the outputs of the Walsh signal amplification controller 2709 at the chip level. Various signal information (quantization rate information, repetition frequency information, quantization start point information, pilot offset information and UDS (identification) ID) and user data mentioned herein are transmitted to the access terminal via a traffic signal transmitter. That is, the signaling message defined in the present description is transmitted through the traffic signal transmitter.

Then, relative to the header transmitter, the point signal converter 2711 converts the header data from all zeros to +1 or -1. Multiplier 2712 orthogonally expands the output of the point signal converter 2711 by multiplying it by a special Walsh hexadecimal biorthogonal code (or sequence) associated with the UDS ID (or UDS index) of the user unit.

Then, with respect to the UDS signal transmitter, the point signal converter 2713 converts 1-bit information to 1 or -1 for the UOM (reverse power control) information. The Walsh signal amplification controller 2714 of the UOM controls the amplification of the output signal of the point signal converter 2713. Multiplier 2715 orthogonally expands the output of the Walsh signal amplification controller 2714 of the UOM by multiplying it by a predetermined orthogonal code associated with the user's unique UDS ID. The repeater 2716 bits repeats the information BDZ (block access to write) 1 bit a predetermined number of times. The point signal converter 2717 converts the output of the 2716 bit repeater to +1 or -1. Multiplier 2718 orthogonally expands the output of the point signal converter 2717 by multiplying it by a predetermined orthogonal code. The Walsh chip level adder 2719 sums the output signals of the multipliers 2715 and 2718 at the chip level. The sequence repeater 2720 repeats the sequence output from the Walsh chip level adder 2719 a predetermined number of times.

Then, relative to the pilot transmitter, the point signal converter 2721 converts the pilot data from all zeros to +1 or -1. Multiplier 2722 orthogonally expands the output of the point signal converter 2721 by multiplying it by a predetermined Walsh code.

A time division multiplexer 2729 (RTM) multiplexes in time the output signals of the traffic signal transmitter, the header transmitter, the UDS signal transmitter, and the pilot transmitter in accordance with a predetermined rule. The quadrature expander 2723 comprehensively expands the output signal of the time division multiplexer 2729 by multiplying it by a given PN code. The main band filters 2724 and 2725 filter the signal of the I component and the signal of the component Q derived from the quadrature expander 2723, respectively, in the main frequency band. For RF modulation, modulators 2726 and 2727 multiply the output signals of their associated baseband filters 2724 and 2725 by a carrier signal. An adder 2728 sums the output signals of the modulators 2726 and 2727 and sends the modulated signal to the access terminal through the antenna.

FIG. 27 illustrates a procedure for determining an access terminal for receiving a direct signal and a data rate described with reference to FIG. 28. Referring to FIG. 27, the access network receives the DRC signal transmitted from the access terminal in step 2901 and detects the DRC signal information by demodulating the received DRC signal in step 2903. The access network decides whether to apply the received DRC signal information immediately to the direct to the signal, at step 2904. If the access network determines immediately to apply the received information about the DRC signal to the direct signal, the access network determines the access terminal to receive the direct signal and data rate using the received information about the US signal D, at step 2907. Otherwise, the access network remembers the detected information about the DRC signal in order to use it when deciding on the direct signal later, at step 2905. After determining the access terminal to receive the direct signal and the data rate, the access network transmits data to a specific an access terminal with a specific data rate in step 2909.

For a better understanding of the invention, reference will be made separately to the transmission operation and the reception operation of the access terminal.

The access terminal determines the speed of the direct data by measuring the intensity of the direct pilot signal, creates information about the DRC signal, including a specific data speed, and then transmits the created information about the DRC signal to the access network. Based on the frequency of the DRC signal repetition “DRC signal duration” (= 1, 2 or 4) and the quantized transmission mode “DRC quantized signal mode” (= enabled or disabled) previously determined by the access network, the access terminal transmits new information about the DRC signal to each time interval ("Duration of the signal RDM" = 1); creates information about the DRC signal in every two time intervals and transmits the created information about the DRC signal in one of 2 time intervals ("DRC signal duration" = 1); or creates information about the DRC signal in every 4 time intervals and transmits the created information about the DRC signal in one of 4 time intervals ("DRC signal duration" = 1). That is, for "DRC signal duration" = 1, the access terminal re-measures the reception power of the pilot signal in each time interval, determines the speed of the direct data, and then transmits the corresponding information about the DRC signal to the access network; for "DRC signal duration" = 2, the access terminal re-measures the reception power of the pilot signal at every 2 time intervals, determines the speed of the direct data, and then transmits the corresponding information about the DRC signal to the access network; and for "DRC signal duration" = 4, the access terminal re-measures the reception power of the pilot signal at every 4 time intervals, determines the speed of the direct data, and then transmits the corresponding information about the DRC signal to the access network.

After transmitting the DRC signal information to the access network, the access terminal must re-determine within a predetermined period of time whether the access network is transmitting direct data at the data rate specified in the transmitted DRC signal information. A certain period of time is variable depending on how long the access network will use the received information about the DRC signal when choosing an access terminal to which direct data should be transmitted. If the access network previously informed the access terminal about the time interval where it uses the DRC signal information when selecting the direct data rate and the access terminal using the signal message, the access terminal does not need to determine whether direct data corresponding to the transmitted DRC signal information is received each time interval before the preliminary transmission of the following information about the signal RDM. That is, since the access terminal knows how long the access network really uses the transmitted information about the DRC signal, the access terminal may stop receiving direct data using signaling information from the access network. If the access network did not inform the access terminal about the time interval where it uses information about the DRC signal, the access terminal must check the direct data signal at each time interval before generating the next information about the DRC signal after the information about the DRC signal is sent to the access network.

FIG. 28 illustrates valid time intervals where the access terminal receives a direct traffic signal in response to transmitted information about the DRC signal. In the first case, the valid time interval becomes one time interval after the information about the signal RDM. Therefore, the access terminal determines whether direct traffic data is received only during a period of one time interval after transmitting information about the DRC signal and terminates the reception operation if it fails to receive direct traffic during this period. After transmitting the DRC signal information in the next transmission period, the access terminal repeats the next process.

Fig. 29 illustrates a procedure for transmitting DRC signal information and detecting direct traffic in an access terminal in accordance with an embodiment of the present invention. Referring to FIG. 29, the access terminal measures the direct pilot signal receive power in step 3001. After that, the access terminal determines the direct data rate based on the measured pilot signal receive power in step 3003 and generates RDM signal information corresponding to the determined data rate, at step 3005. Then, the access terminal transmits the created information about the DRC signal to the access network through the reverse DRC signal at step 3007. After transmitting information about the DRC signal, the access terminal determines at step 3009 whether the data is received directly of traffic from the access network. If the direct traffic data is received at the requested data rate, the access terminal receives the direct traffic data in step 3015. However, after failure to receive the direct traffic data, the access terminal determines in step 3011 whether the valid interval of the DRC signal information has expired. If the valid interval of the DRC signal information has not expired in the access network, the access terminal returns to step 3009 in order to determine whether direct data is received in the next time interval. However, if the valid interval for the DRC signal information has expired in the access network, the access terminal determines in step 3013 whether the time elapsed after transmitting the DRC signal information is longer than the DRC signal transmission period “DRC signal duration”. In this process, the access terminal can either repeat or stop receiving a direct signal. If the elapsed time is longer than the transmission period, the access terminal returns to step 3001 in order to measure the reception power of the direct pilot signal again, and then perform the following steps. Here, it is assumed that the access network reports a valid interval of information about the DRC signal to the access terminal through a signal message. If valid interval information is not provided to the access terminal, step 3011 may be canceled.

In order to summarize in the mode of quantized transmission of the DRC signals and the mode of repeated transmission of the DRC signals, when the throughput of the reverse link is saturated due to interference of the DRC signals between users, the access terminals gate the transmission of the DRC signals in predetermined periods or re-transmit the same DRC signals with reduced transmit power, thus helping to reduce interference between users and increase reverse link throughput.

As described above, the method of quantized transmission of the DRC signals and the method of the repeated transmission of DRC signals, in accordance with the present invention, can solve the problem of reducing the reverse link throughput that may occur in the IRR system. In the invention, if the reverse link bandwidth is saturated, the access terminal switches to the quantized DRC signal transmission mode or the repeated DRM signal transmission mode. The quantized DRC signaling mode can help reduce interference between users and increase the reverse link throughput, and the repeatable DRC signaling mode can also help reduce interference due to the DRC signals in the reverse link, therefore, increasing the reverse link throughput.

In the aforementioned implementations, the access terminal measures the environment of the direct signal (pilot), and based on which, the reverse transmission of the maximum direct information about the DRC signal that the access terminal can receive is disclosed. However, the access terminal may transmit a measurement value of the direct pilot signal reception signal, i.e., the LF / R pilot signal. The invention may also be applicable to another case where the access terminal transmits a pilot LF / R signal. In this case, the access terminal transmits a value measuring the reception intensity of the direct pilot signal in accordance with information that can simulate the LF / P update period (corresponding to the "DRC signal duration") or other quantization speed specified from the controller.

Although the invention is depicted and described with reference to its specific preferred implementation, specialists in the art will understand that various changes in form and details can be made in it, without going beyond the scope and essence of the invention, as defined in the attached claims inventions.

Claims (41)

1. The access network device in a mobile communication system with a high data transfer rate, comprising a measuring part for measuring a receiving power of a reverse DRC signal (controlling a data transfer rate), a controller for determining a quantization speed of a reverse DRC signal corresponding to the highest value from values lower than the value of the measured reception power of the reverse DRC signal among a plurality of predetermined threshold values, and a transmitter for transmitting a signal message including information y indicating the quantization rate to the access terminal. 2. The access network device according to claim 1, in which the signal message further includes information about the time interval where the transmission of the reverse DRC signal begins, and information about whether the offset is applied to the pilot signal. 3. The access network device according to claim 1, in which the reception power of the reverse DRC signal is determined as the average signal-to-noise ratio, determined by measuring the signal-to-noise ratio of each reverse DRC signal received from each user, and then by dividing the measured ratios signal to noise per number of users. 4. The access network device according to claim 1, wherein the reception power of the reverse DRC signal is determined at least as the magnitude of the plurality of signal-to-noise ratios measured for the reverse DRC signals received from each user. 5. The access network device according to claim 1, in which the signaling message further includes an ID IDD (medium access control identification). 6. The access network device according to claim 5, in which the access terminal determines the time interval where the transmission of the reverse DRC signal begins, and whether the offset is applied to the pilot signal using the quantization rate and the DRC ID included in the signal message. 7. An access terminal device in a mobile communication system with a high data rate, comprising a DRC signal transmitter for generating a DRC channel signal by expanding the DRC channel information indicating one of the direct data speeds, a controller for determining a quantization speed of the DRC signal using a signal messages from the access network and controlling the gating device so that the DRC signal is quantized in each predetermined number of time intervals in accordance with a certain speed quantization, and a gating device controlled by the controller and quantizing the created channel signal RDM. 8. The access terminal apparatus of claim 7, further comprising a pilot transmitter for generating a pilot channel signal. 9. The access terminal apparatus of claim 8, wherein the DRC channel signal from the DRC signal transmitter and the pilot channel signal from the pilot transmitter are time division multiplexed. 10. The access terminal apparatus of claim 8, wherein the DRC channel signal from the DRC signal transmitter and the pilot channel signal from the pilot transmitter are code division multiplexed. 11. The access terminal device according to claim 1, in which the signal message contains information about the speed of quantization and information about the time interval where the transmission of the signal RDM. 12. The access terminal device according to claim 7, in which the signal message contains information about the speed of quantization and information ID DR. 13. The access terminal device according to item 12, in which the controller determines the time interval where the transmission of the RDM signal begins, using the quantization speed information and the RDM ID information. 14. The access terminal device according to claim 7, in which the controller determines the quantization rate by inverting the repetition frequency and controls the gating device with a specific quantization speed during the quantized transmission of the signal of the DRC channel to the access network. 15. The access network device in a mobile communication system with a high data transfer rate, comprising a measuring part for measuring the reception power of the reverse DRC signal, a controller for determining a quantization speed of the reverse DRC signal corresponding to the largest value that is lower than the value of the measured reverse receive power a DRC signal among a plurality of predetermined thresholds, and a signal transmitter for transmitting a signal message including information indicating a repeat frequency niya, and information indicating the transmit power to the access terminal. 16. The access network device of claim 14, wherein the signaling message further comprises information indicating whether the reverse DRC signal is quantized. 17. The access network device of claim 14, wherein the transmit power of the DRC signal is defined as the value obtained by multiplying the transmit power of the pilot signal by the reciprocal of the repeat frequency of the DRC signal. 18. The access terminal device in a mobile communication system with a high data rate, comprising a controller for determining the frequency of the RDM signal and the transmit power of the RDM signal by using a signal message from the access network, a RDM signal transmitter controlled by the controller to repeat the RDM channel signal indicating one of the direct data rates, as many times as the repetition rate, and a gain controller controlled by a controller that determines the repetition rate and signal transmission power RDM to set the transmit power of the RDM channel signal transmitted from the RDM signal transmitter below the pilot transmit power. 19. The access terminal apparatus of claim 18, wherein the transmit power of the DRC signal is transmitted as a value obtained by multiplying the transmit power of the pilot signal by the reciprocal of the DRC signal repetition rate. 20. A method for transmitting information about a DRC signal selected by an access terminal to an access network in a mobile communication system, by which an access terminal transmits information about a DRC signal to an access network indicating a selected one of the direct data rates requested by the access terminal, and the access network determines the duration of the DRC signal information indicating the number of time intervals where the DRC signal information is repeated, and transmits the DRC signal duration information to the access terminal, while the access terminal gates the transmission information about the DRC signal to the access network in one time interval for each duration of the DRC signal information. 21. The method for transmitting data for an access network in a mobile communication system with a high data rate, which measures the reception power of the reverse DRC signal, determines the quantization speed of the reverse DRC signal corresponding to the highest value that is lower than the measured value of the received reverse signal power The DRC is among a plurality of predetermined thresholds, and a signal message including information indicating a specific quantization rate is transmitted to the access terminal. 22. The data transmission method according to item 21, in which the signal message further includes information about the time interval where the transmission of the reverse signal RDM, and information about whether the offset is applied to the pilot signal. 23. The data transmission method according to claim 21, wherein the receiving power of the reverse DRC signal is determined as the average signal-to-noise ratio, determined by measuring the signal-to-noise ratio of each reverse DRC signal received from each user, and then by dividing the measured ratios signal to noise per number of users. 24. The data transmission method according to claim 21, wherein the receiving power of the reverse DRC signal is determined at least as the magnitude of the plurality of signal-to-noise ratios measured for the reverse DRC signals received from each user. 25. The method for transmitting data for an access network in a mobile communication system with a high data transfer rate, which measures the reception power of the reverse DRC signal, determines the quantization speed of the reverse DRC signal corresponding to the largest value that is lower than the measured value of the received reverse signal power The DRC among a plurality of predetermined thresholds, set the transmit power of the reverse DRC signal below the transmit power of the reverse pilot signal, and transmit a signal message, including information indicating the frequency of repetition, and information indicating the transmit power of the reverse signal RDM. 26. The data transmission method according to claim 25, wherein the signal message further comprises information indicating whether the reverse DRC signal is quantized. 27. The data transmission method according to claim 25, wherein the transmit power of the DRC signal is transmitted as a value obtained by multiplying the transmit power of the pilot signal by the reciprocal of the repeat frequency of the DRC signal. 28. The method of transmitting data for an access network in a mobile communication system with a high data rate, which requests the repetition rate of the DRC signal by using a signal message from the access network, sets the transmit power of the DRC channel signal below the transmit power of the pilot signal in accordance with the requested the repetition rate and retransmit the DRC signal with a certain transmit power as many times as the repetition rate. 29. The data transmission method according to claim 28, wherein the quantization speed is further determined by inverting the repetition rate after receiving the quantized transmission command from the access network and quantized with at least one of the repeated DRC signals in accordance with the determined quantization speed. 30. The data transmission method according to claim 28, wherein the transmit power of the DRC signal is transmitted as a value obtained by multiplying the transmit power of the pilot signal by the reciprocal of the repeat frequency of the DRC signal. 31. A communication method in a mobile communication system with a high data rate by which a signal message is transmitted during call setup including information indicating the repetition rate of the reverse DRC signal and information indicating whether the offset is applied to the pilot signal from the access network to the access terminal, the reverse DRC signal is retransmitted, requesting one of several direct data rates, from the access terminal to the access network as many times as the repetition rate is equal if the access terminal determines that the quantized transmission mode is turned off by using a signal message, the quantization speed is determined by inverting the repetition frequency if the access terminal determines that the quantized transmission mode is turned on, or after receiving the message of the quantized transmission mode command from the access network, and the inverse DRC signal is quantized in a predetermined number of time intervals in accordance with a certain quantization rate. 32. The communication method of claim 31, wherein, when the DRC signal is retransmitted, the transmit power of the DRC signal is set lower than the transmit power of the pilot signal. 33. The method of transmitting data for an access network in a mobile communication system with a high data rate, which determines the time interval required to determine the direct data transfer rate, and reports this specific time interval to the access terminal, remembers the reverse DRC signals received in the interval time, determine the access terminal to which direct data should be transmitted, and the direct data rate using the stored feedback signals of the DRC, and transmit the direct data to certain terminal access to a specific data rate. 34. A method for transmitting data for an access terminal in a mobile communication system with a high data transfer rate, which determines the direct data transmission speed of the request by measuring the direct pilot signal reception power, creates information about the DRC signal corresponding to a certain direct data transfer rate, transmit the created information about the DRC signal to the access network, after transmitting information about the DRC signal, determine whether direct data is received during the valid transmission interval of the DRC signal defined by the network th access, and upon failure to take direct data transmission interval within the valid DRC signal receiving operation is stopped until the next DRC transmission signal. 35. The communication method in a mobile communication system by which the access terminal transmits information about the DRC signal indicating the selected one of the direct data speeds requested by the access terminal to the access network, wherein information about the duration of the DRC signal "duration of the DRC signal" indicating the number time intervals where the information about the DRC signal is repeated, and this specific information about the duration is transmitted from the access network to the access terminal, and the transmission of information about the DRC signal to the access terminal in one the time interval in each information about the duration of the RDM signal received from the access network. 36. The method of transmitting data for an access terminal in a mobile communication system with a high data transfer rate, which creates a signal of the RDM channel by expanding the channel information about the RDM signal indicating one of the direct data speeds, determine the quantization speed of the RDM signal using the signal messages from the access network both quantize and transmit the DRC signal at each time interval in accordance with a certain quantization rate. 37. A method for determining an access network mode in a mobile communication system in which a continuous mode is supported in which data rate control information indicating one of a plurality of direct data rates in each time interval is transmitted continuously, and a gated mode that is gated and transmitted in one of the predetermined time intervals over which they switch from the continuous mode to the quantized mode, if the intensity of the reception of the signal for controlling the speed of the inverse data lower than the first reference value, switching from the continuous mode to the quantized mode, if the intensity of reception of reverse data rate control signal is higher than the second reference value, and transmitting a signaling message including information defining a switched quantized or continuous mode to the access terminal. 38. The method according to clause 37, in which the first initial value is different from the second initial value. 39. The method according to clause 37, which further determines the quantization speed of the DRC signal in the quantization mode by comparing the access network with the reception intensity of the reverse DRC signal with predetermined initial values less than the first initial value, and transmitting a signal message including information, defining a specific quantization rate to the access terminal. 40. A method for determining the transmission rate of direct data of an access network in a mobile communication system by which users are grouped into multiple user groups, each user group transmits information about the DRC signals in a time interval having a predetermined duration, and the access network receives information about the DRC signals, while the access network collects the most recently received information about the DRC signals with respect to each of the user groups and determines the transmission rate of direct data in the time interval yuschem predetermined duration. 41. The method of transmitting information of the intensity of reception of the ratio of the carrier frequency to the interference of the pilot signal (LF / P) selected by the access terminal to the access network in the mobile communication system, by which the access terminal measures the reception intensity of the direct pilot signal of the access network and transmits the measurement result to the access network, and the access network determines the duration of the LF / P information indicating the number of time intervals where the LF / P information is repeated, and transmits the duration of the LF / P information to the access terminal, while the access terminal is a strobe t transmission signal information DRC to the access network at one time slot at each duration of the DRC information signal.

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