KR100547839B1 - Selective reverse data transmission apparatus and method in a mobile communication system - Google Patents

Abstract

A method of transmitting reverse data from a terminal of a mobile communication system to a base station is disclosed. The present invention efficiently controls the reverse data transmission in mobile communication systems such as the 1xEV-DO system and the 1xEV-DV system to efficiently perform overload control of the base station to ensure the performance and capacity of the system. By notifying the transmission status of the base station is characterized in that the base station to more efficiently manage the radio resources. In addition, when there are two or more mobile stations requesting data transmission, and the base station lacks resources to be allocated, it is possible to selectively determine the mobile station to allow data transmission. In addition, it is characterized by a transmission and reception device necessary for the operation proposed in the present invention.

Data rate, reverse, initial transmission, retransmission

Description

Selective reverse data transmission apparatus and method in mobile communication system {SELECTIVE REVERSE DATA TRANSMISSION APPARATUS AND METHOD IN A MOBILE COMMUNICATION SYSTEM}             

1 is a diagram illustrating an operation between sectors and a mobile station in an active set of a 1xEV-DO system, which is an example of a mobile communication system to which the present invention is applied;

2 is a view for explaining the basic operation of a mobile communication system having channels F-CDRCH and F-PANCH proposed by the present invention;

3 is a view for explaining an operation in a continuous state according to an embodiment of the present invention;

4 is a flowchart illustrating an initial transmission operation by a terminal according to an embodiment of the present invention;

5A is a flowchart illustrating a continuous data transmission operation by a terminal according to an embodiment of the present invention;

5B is a flowchart illustrating a continuous data transmission operation by a terminal according to another embodiment of the present invention;

6 is a flowchart illustrating a retransmission operation by a terminal according to an embodiment of the present invention;

7 is a flowchart illustrating a retransmission operation by a base station according to an embodiment of the present invention;

8 is a control flowchart of a mobile station when selectively controlling a data rate of a terminal according to an embodiment of the present invention;

9 is a control flowchart of a base station when selectively controlling a data rate of a terminal according to an embodiment of the present invention;

10 is a channel structure diagram for forward transmission of ACK / NACK information on a packet according to an embodiment of the present invention;

11 is a channel structure diagram for receiving ACK / NACK information on a packet according to an embodiment of the present invention;

12 is a channel structure diagram for transmitting a common data rate in the forward direction according to an embodiment of the present invention;

13 is a channel structure diagram for receiving a common data rate in accordance with an embodiment of the present invention.

The present invention relates to data transmission in a mobile communication system, and more particularly, to a method for transmitting reverse data from a terminal to a base station.

Typically, mobile communication systems, such as Code Division Multiple Access (CDMA) systems, typically support only voice services. However, according to the rapid development of communication technology and user's demand, mobile communication system is developing in the form of providing data as well as voice service. As a representative example, 1st generation evolution-data only (1xEV-DO) and 1st generation evolution-data and voice (1xEV-DV) systems are being developed as improved models of the CDMA 2000 1x system. The above systems are mobile communication systems using CDMA technology for the purpose of high speed data transmission, and the main purpose of the efficient packet data transmission. In such a system, proper scheduling is required for efficient transmission of forward and reverse packet data.

In the case of forward link data transmission in the mobile communication system, the base station transmits data to only one specific mobile station (or terminal) having the best channel state in consideration of the air condition and other environments, thereby transmitting the data of the mobile station. Maximize the throughput. In contrast, in reverse link data transmission, a plurality of mobile stations access a single base station at the same time to transmit packet data. Accordingly, the base station should appropriately control the flow and congestion of data received from the plurality of mobile stations to perform appropriate overload control within the capacity of the mobile station.

On the other hand, since the 1xEV-DO system controls the reverse link through the common channel, effective control of the reverse link cannot be achieved. In addition, the system being discussed as 1xEV-DV has not yet been introduced in detail, so it is not known exactly how to operate the reverse link. Of course, there are some discussions regarding data rate control of the reverse link in the 1xEV-DV system. However, these contents allow simple bandwidth control and overload control on the system side, which leads to a serious waste of reverse bandwidth with a batch control method that does not consider the state of the mobile station, and also improves the data transmission efficiency of the mobile station. It is a control method that drops

Accordingly, an object of the present invention is to provide a processing method for efficiently transmitting reverse data in a mobile communication system and improving system performance.

Another object of the present invention is to provide a data rate determining method for efficient reverse data transmission and system performance improvement in a mobile communication system.

It is still another object of the present invention to provide a method of determining reverse data rate in consideration of a state of a mobile station in a mobile communication system and transmitting reverse data accordingly.

It is still another object of the present invention to provide a method in which a mobile station can more efficiently manage radio resources by informing each base station of a transmission state of a mobile station in a mobile communication system.                         

The present invention to achieve these objectives is to efficiently control the reverse data transmission in the mobile communication system such as 1xEV-DO system and 1xEV-DV system to efficiently perform the overload control of the base station to ensure the performance and capacity of the system In addition, the present invention proposes a method for enabling a base station to more efficiently manage radio resources by informing the base station of the transmission status of the mobile station.

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

In the following, a method for improving performance of a system in which reverse link is not efficiently controlled, such as a 1xEV-DO system, an overall structure of a reverse link that can be used in a 1xEV-DV system, an operation scheme, and a control method of a data rate Etc. will be described. For this invention, the channel structure of the system as shown in Table 1 below is considered based on the system currently being discussed as 1xEV-DV. In Table 1 below, the channels used for the reverse link are channels currently being discussed in the 1xEV-DV system, and the F-CDRCH and F-PANCH used for the forward link are newly proposed channels in the present invention.

Reverse Link Channel: * R-SCH (Reverse Supplemental Channel) 1/2 → New packet data channel using RC (Radio Configuration) for 1xEV-DV * R-RICH (Reverse Rate Indicator Channel) → R- on reverse link Channel indicating the data rate of the SCH Forward Link Channel: * F-CDRCH (Forward Common Data Rate Channel) → Channel indicating the maximum data rate currently allowed on the reverse link * F-PANCH (Forward Packet Ack / Nack Channel) ) → Channel that transmits Ack / Nack which is feedback information about packets transmitted on reverse link

In Table 1, the F-PANCH is configured to request two or more retransmission frames in order to increase the reception success probability before or after the maximum number of retransmission allowances if an error occurs continuously in the received frame. Such F-PANCH may be configured as shown in Table 2 below.

 * Ack / Nack feedback information for SCH 1/2: 2 bits (00 = SCH1-ACK, SCH2-ACK, 01 = SCH1-ACK, SCH2-NACK, 10 = SCH1-NACK, SCH2-ACK, 11) = SCH1-NACK, SCH2-NACK) * Information defining the number of retransmitted frames (information): 2 bits (00 = Null (ACK), 01 = 1 retransmission, 10 = 2 retransmissions, 11 = Reserved)

In addition, in a scheduling mode used in a 1X system such as an IS-2000, the base station allocates a "duration" through which the base station can transmit packet data to the mobile station, and thus extends the previously allocated duration. A bit defining the number of retransmission frames may be used as shown in Equation 1 below.

N * reverse frame duration (20ms or multiples) + alpha

Here, N is the number of frames retransmitted. The reverse frame duration may be defined as 20 ms based on the current IS-2000 system, but may be changed according to the frame length defined in the applied system. Alpha is a marginal transmission time including propagation delay time and transmission delay time required in addition to the processing time of the frame.

According to the proposed scheme as described above, in the system in which the reverse link is operated by the scheduling method, the channel duration time allocated during the initial call setup can be extended. For example, the base station receives an arbitrary frame and, when an error occurs, compares the duration allocated to the terminal to request retransmission of the error frame and does not guarantee time until the frame is received again. In case of failure, if N is set to any number and transmitted, the previously allocated duration may be extended as defined in Equation 1 above.

As described above, a mobile communication system including a base station and a terminal (mobile station) having a proposed channel structure includes a system access state, that is, an initial data transfer operation and a data transfer operation in a continuous state. In this case, the data retransmission operation and the data transmission operation in the handoff region may be divided and described. In the following, the basic operation under the channel structure proposed by the present invention will first be described with reference to FIG. Next, each operation according to an embodiment of the present invention will be described schematically. In particular, the data transmission operation in the continuous state according to an embodiment of the present invention will be described with reference to FIG. 3. Next, a processing flow of each operation according to an embodiment of the present invention will be described with reference to FIGS. 4 to 7. Operations according to an embodiment of the present invention to be described below may be applied to a 1xEV-DO system representing an operation between sectors and a mobile station in an active set as shown in FIG. 1. Detailed description of the 1xEV-DO system will be omitted.

2 is a view for explaining the basic operation of the mobile communication system having the F-CDRCH and F-PANCH proposed by the present invention. The operation scheme proposed by the present invention is largely composed of a system access state (or initial state) and a continuation state. In the initial state of the system, the terminal always monitors the F-CDRCH, and the terminal determines specific data within the maximum data rate range allowed by the F-CDRCH according to power limitation information and buffer status of the terminal. The signal requesting the transmission rate is transmitted to the base station. At this time, the transmitted signal is a jamming signal (Jamming Signal) and transmits the IAB (Increse Available Bit) bit portion transmitted to the R-RICH as '00'. The IAB bit is information transmitted to the R-RICH, and 2 bits are allocated as shown in Table 3 below, and functions are defined according to respective bitmaps.

 * IAB = 00: Jamming Signal (Informs only the required data rate of R-SCH. In this case, R-SCH is not transmitted.) * IAB = 01: Increasing request (measured by T / P, buffer status or etc.) * IAB = 10: Decreasing request (measured by T / P, buffer status or etc) * IAB = 11: maintain (or increasing over allowed data rate (rate limit))

When the terminal succeeds in initial access in the system access state, the terminal transitions to the continuous state. In this continuous state, the terminal monitors a Congestion Control Bit (CCB) transmitted on a congestion control subchannel.
As described above, a mobile communication system including a base station and a terminal (mobile station) having a proposed channel structure includes a system access state, that is, an initial data transfer operation and a data transfer operation in a continuous state. In this case, the data retransmission operation and the data transmission operation in the handoff region may be divided and described. In the following, the basic operation under the channel structure proposed by the present invention will first be described with reference to FIG. Next, each operation according to an embodiment of the present invention will be described schematically. In particular, the data transmission operation in the continuous state according to an embodiment of the present invention will be described with reference to FIG. 3. Next, a processing flow of each operation according to an embodiment of the present invention will be described with reference to FIGS. 4 to 7. Operations according to an embodiment of the present invention described below are not only a 1xEV-DV system, but also a 1xEV-DO representing an operation between a sector and a terminal in an active set as shown in FIG. 1. The same applies to the system.

A-1. Initial Data Transmission in System Access State

Initial transmission operation according to an embodiment of the present invention is performed in the following order.

(Process 1) The base station notifies the terminal of the maximum data rate that can be currently allowed through the F-CDRCH, and determines the data rate that can be transmitted by monitoring the channel at the time when the terminal intends to transmit data.

In this case, the F-CDRCH transmitted by the base station may be transmitted periodically or aperiodically. That is, whenever the base station transmits the F-CDRCH, the F-CDRCH is set to the maximum data rate that can be allowed based on the base station's rise over thermal (ROT) according to the data rate and the transmission power of the terminals existing in the current cell. Broadcast through.

In order to prevent a plurality of terminals from starting data transmission (overshoot due to rapid increase in ROT) by using the same data rate as a target at any moment, the base station has a power margin. To determine the maximum data rate, or to determine the frame boundary by assigning a persistence value (a value that can be used to perform the persistence test according to the maximum allowed data rate). To help. If the Persistence test is performed, the value of the Access Class used in the IS-2000 may be used, or the base station may allocate a new Persistence value to the UE.

(Process 2) The UE considers the currently monitored F-CDRCH, its power limitation, and buffer status to determine the data rate during initial access. It is determined as in Equation 2 below.

(Process 3) When the initial rate is determined as shown in Equation 2, the terminal uses the IAB as a jamming signal (IAB = 00). For example, if a request data rate is transmitted to IAB = 00 and R-RICH, the base station regards IAB = 00 as a jamming signal and considers the currently requested data rate to the next F-CDRCH frame. Send the Maximum Allowable Data Rate (MADR). In the case of actually transmitting data through the R-SCH, IAB = 11 and a data rate are transmitted through a reverse-rate indicator channel (R-RICH). In this case, considering the data rate requested by the F-CDRCH at the moment of monitoring the F-CDRCH, the transmission starts when the data rate broadcast in the next F-CDRCH frame is higher than the data rate requested by the previous frame. This operation avoids starting from the minimum data rate in the initial transmission and provides transmission efficiency by omitting the negotiation process required in the scheduling mode. After transmitting IAB = 11, in subsequent transmissions, the terminal may transmit IAB = 10 or IAB = 01 and IAB = 11. One embodiment of such a transmission will be described below.

(Example) MADR at frame t: 600Kbps MS 1: 300K request MS 2: 200K request MS 3: 200K request

As shown in Table 4, it is assumed that the MADR in frame t is 600 Kbps and the MADR received after the terminal transmits a jamming signal as described above is 250K. ) 2 and MS 3 start transmission because the data rate broadcast from the base station is greater than the requested data rates, and the terminal 1 rejects and retries since the data rate broadcast from the base station is less than the requested data rate. and re-attempt). However, when the minimum value of the F-CDRCH and the power limit is 9.6 Kbps of the minimum value of the R-SCH, and the terminal performs data transmission at the minimum data rate, the R-SCH and the R-RICH may be transmitted without a jamming signal.

(Step 4) If the F-CDRCH does not allow the minimum data rate (9.6Kbps) or if it does not allow it artificially, the terminal determines the next access point through the persistence test (defined in 1x). Use the ACC mode value or grant message) or send channel request message (SCRM or SCRMM: Supplemental Channel Request Message or Mini Message) to perform channel assignment by scheduling. can do. When the terminal transmits a channel allocation request message, the base station transmits a grant message as shown in Table 5 below.

Grant Message for SCH1 and SCH2 Field Length (bits) MSG_TYPE 3 ACK_SEQ 2 MSG_SEQ 2 ACK_SEQ One one or two occurrences of the following three-field record: REV_SCH_ID 1 (may not needed) REV_SCH_DURATION 4 REV_SCH_START_TIME 5 REV_SCH_NUM_BITS_IDX 4 REV_SCH_LIMIT_RATE 3 RESERVED XXX

In Table 5, REV_SCH_ID is an ID for distinguishing between SCH1 and 2.

REV_SCH_DURATION: occupancy time allocated to SCH 1 and 2, respectively

REV_SCH_START_TIME: Start time of SCH 1 and 2,

REV_SCH_NUM_BITS_IDX: Used with the DURATION field, it is the data rate of SCH1 and 2.

REV_SCH_LIMIT_RATE: The maximum data rate that can be used in SCH 1 and 2.

The messages shown in Table 5 are written so that SCHs 1 and 2 used by the UE can be independently assigned and operated, so that different parameters can be allocated when the UE requests SCH1 and SCH2 simultaneously. It is. When SCH 1 and SCH 2 appear simultaneously, information of SCH 1 and SCH 2 is sequentially indicated.

A-2. Data Transmission in Continuation State

3 is a view for explaining an operation in a continuation state according to an embodiment of the present invention.

The maximum allowable data rate is limited by adding information about a reverse data rate limit to the SCAM currently used in 1x. Therefore, the terminal may change the transmission rate from the minimum null to the rate limit value including the allocated transmission rate. In this case, the terminal may change the data rate based on the monitored T / P, and the change of the fine power within the allowed data rate range may be changed based on the congestion control bit. If the terminal requests the increase of the data rate within the current data rate or more than the rate limit value range, IAB = 01 is transmitted. On the other hand, if the data rate is required above the allowed rate limit, the terminal transmits IAB = 11. Alternatively, the terminal may reassign data rate and rate limit by transmitting SCRM. When the terminal transmits IAB = 11, since a change in data rate and a change in ROT may occur suddenly according to a marginal power allocated to an arbitrary terminal, the base station is allocated to the total cell capacity. You will need to reset the Bandwidth and ROT. Therefore, the base station needs to inform the terminal that the terminal has requested the reverse rate limit value or more. At this time, after the base station receives IAB = 11, the base station transmits a congestion control bit (CCB) as "Up". When the terminal receives the congestion control bit of "Up", it transmits the I-AB = 11 and then transmits the R-SCH one frame (20ms) at the requested transmission rate. However, when a "Down" congestion control bit is received, the data rate is maintained and the current rate and power are maintained.

A-3. Data Retransmission

Retransmission does not allow for a change in data rate, i.e. adaptive transmission. Therefore, it is possible to maintain the data transmission rate at the initial transmission as it is, to allow power variation in consideration of the current channel situation, and to increase the probability of success at the time of retransmission and the number of frames to be retransmitted as a plurality (N). We propose a method to increase the coupling gain in.

Parameters that can control power variation during retransmission are T / P (Traffic to Pilot Ration) and congestion control bits (or F-CDRCH). In this case, the variation of the T / P is a value compared with the T / P at the time of transmission of the previous frame. N indicative of the number of retransmissions in Table 6 below is a value that can be allocated from the base station in advance. Alternatively, the value can be determined according to the T / P transition and the value of the congestion control bit. For example, if the received congestion control bit is more than K consecutively Up or Down, N value can be set.

T / P status Cong. Bit status Receiver Activity T / P up Cong. Bit up ReTx power up + Num of ReTx (1) T / P up Cong. Bit down ReTx power down + Num of ReTx (N) T / P down Cong. Bit up ReTx power up + Num of ReTx (N) T / P down Cong. Bit down ReTx power down + Num of ReTx (N)

In addition to the retransmission scheme as described above, the base station determines the number of frames to be retransmitted and can be transmitted to the terminal. In this case, the number of frames to be retransmitted may be determined by the number of required ReTx frames received with the NAK. When the base station defines the number of retransmissions and transmits them to the terminal, when the base station operates in the scheduled mode according to the set retransmission number (N), as shown in Equation 1, N * reverse frame duration (20ms or multiples) + alpha can be used to extend the channel duration time allocated during initial call setup. In this case, alpha may be defined as a marginal transmission delay in consideration of a round trip delay time.

A-4. Data Transmission under Handoff zone

Data transmission in the handoff area is performed as follows. That is, the terminal monitors two or more F-CDRCHs, compares the data rate of the F-CDRCH allowing the minimum data rate with the power limit value of the terminal, and transmits a jamming signal at the minimum data rate, and permits the F-CDRCH. Transmit data according to the maximum possible data rate variation.

B. Data Transmission Flow According to the Embodiment
Hereinafter, a processing flow of each operation according to an embodiment of the present invention will be described with reference to FIGS. 4 to 7.

4 is a flowchart illustrating an initial transmission operation by a terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 4, in step 4-1, the terminal receives information about a data rate according to the Persistence Value and the T / P from the base station through a message. In step 4-5, the terminal checks whether there is data to be transmitted. If there is data to be transferred, perform steps 4-10, otherwise repeat steps 4-5. In step 4-10, the UE monitors the F-CDRCH and receives the maximum rate information transmitted by the current base station. In step 4-15, the transmission rate that can be provided by the F-CDRCH is confirmed. If the F-CDRCH is 9.6 Kbps, proceed to Step 4-90. Otherwise, proceed to Step 4-25. When the terminal operates in the scheduling mode in step 4-90, the terminal transmits a channel request message to the base station as in step 4-95, and performs the reverse link operation as in the conventional IS-2000 system. If the terminal does not operate in the scheduling mode in step 4-90, the terminal determines whether to perform the PV test. If the terminal performs the PV test, it determines the next access point as in step 4-110. If the PV test is not performed in step 4-100, the terminal transmits the R-SCH at 9.6 Kbps as in step 4-105.

In step 4-25, if the F-CDRCH is smaller than 9.6 Kbps, it is determined in step 4-30 whether to perform the persistence test (PV test). If the PV test is to be performed, the PV test is performed in step 4-35 to determine the time point for the next data transmission, and the process 4-10 is performed. If the PV test is not performed in step 4-30, in step 4-40, the UE transmits a channel assignment message (for example, SCRM or Supplemental Channel Request Message or SCRMM) to the base station. Wait for the channel assignment message transmitted from the base station in the same way as used in IS-2000. At this time, the grant message, which is a channel assignment message transmitted from the base station, is composed of the structure proposed in the present invention. Process 4-50 is a process of measuring the maximum power that the terminal can transmit when the maximum allowable data rate (MADR) that the base station can allow is 9.6 Kbps or more. Although not shown in the figure, the state of the transmission (Tx) buffer of the terminal can be considered together. In step 4-55, the data transmission rate is determined by comparing the power limit value of the terminal with the minimum value of the F-CDRCH. If the determined data rate is less than 9.6 Kbps, proceed to step 4-20. If the data rate determined in step 4-65 is greater than 9.6 Kbps, set IAB transmitted to R-RICH to "00" in step 4-70, and set the required data rate in the data rate portion of R-RICH. Transmit to base station. At this time, the transmitted signal becomes a jamming signal. After transmitting the jamming signal in step 4-70, the UE monitors the F-CDRCH in step 4-75 and observes the variation of the F-CDRCH. After transmitting the jamming signal in step 4-80, if the monitored F-CDRCH is higher than the initially requested rate, the R-SCH transmission starts at the data rate initially transmitted in step 4-85. However, if the MADR less than the data rate required in step 4-80 is measured through F-CDRCH, step 4-30 is performed.

5A is a process flow diagram of a continuous data transfer operation by a terminal according to an embodiment of the present invention.

Referring to FIG. 5A, in step 5-1, the UE monitors a CCB transmitted through a congestion control subchannel transmitted by a base station. The current terminal transmits a channel request message like the IS-2000, and checks whether the scheduling method operates by receiving the channel assignment message in step 5-5. At this time, if the scheduling method is operated, the process 5-80 is performed. In step 5-80, it is checked whether the duration allocated to the terminal remains. At this time, if the duration is "0", transmission of data through the R-SCH is stopped in step 5-110. If the current channel is in progress in step 5-80 (the remaining duration is greater than 0), the UE measures the CCB transmitted from the base station in step 5-85. At this time, if the CCB is "Down", the current transmission power is reduced in step 5-115 and the step 5-80 is performed. In contrast, if the CCB is "Up", the terminal performs a process of checking whether the data rate can be increased in 5-90. At this time, the terminal measures the T / P of the base station and compares the data rate and the current data rate mapped to the T / P allocated from the base station. If, in step 5-90, the UE cannot increase the data rate, that is, the current rate is greater than the T / P, only the transmit power is increased in step 5-120. However, if the UE can increase the data rate, a process of comparing the Reverse Rate Limit value allowed by the BS to the UE is performed in step 5-100. If the data rate to increase the rate limit value is large in step 5-100, the terminal increases the data rate in step 5-105 and transmits data through the R-SCH. However, if the data rate is small, the UE maintains the current data rate in step 5-125, increases only the transmit power in step 5-120, and transmits data through the R-SCH.

If the UE is not currently operating in the scheduling mode in step 5-5, the T / P is continuously monitored in step 5-10. If the CCB is " DOWN " in step 5-15, check whether the current data rate can be reduced in step 5-55. If the situation is not able to reduce the data rate, only transmit power is reduced in steps 5-50. In contrast, if the data rate can be reduced, in step 5-60, the IAB transmitted to the R-RICH is set to "10" and the data rate of the R-SCH is lowered before data transmission is performed. After observing CCB as "UP" in step 5-15, check whether the data rate can be increased in step 5-20. If the current T / P is measured, the data rate according to the T / P previously assigned by the base station is compared with the current rate, and when the current T / P is larger than the current rate, the rate limit value in step 5-25. Perform the process of comparing with. If it is impossible to increase the data rate in step 5-20, the R-SCH is transmitted by increasing only the transmit power in step 5-65. If the data rate to increase than the rate limit value is small in step 5-25, IAB is set to "01" in step 5-70 and data transmission is performed by increasing the data rate of the R-SCH. However, if the data rate to be increased is greater than the rate limit value, the IAB is set to "11" in step 5-30 and data is transmitted through the R-SCH. At this time, the data rate through the R-SCH is not increased. After sending IAB = "11", monitor CCB in step 5-35. If the CCB monitored in step 5-40 is "Up", in step 5-45, the UE considers that the data rate is higher than the reverse rate limit value, and increases the data rate and transmits data through the R-SCH. However, if the CCB is "Down", in step 5-75, data is transmitted through the R-SCH while maintaining the current data rate.

5B is a process flow diagram of a continuous data transfer operation according to another embodiment of the present invention. This embodiment is a process flow in a system in which a terminal is controlled by a congestion control subchannel rather than scheduling.

Referring to FIG. 5B, in step 501, the UE monitors a CCB transmitted through a congestion control subchannel transmitted by a base station. If the CCB is "UP" in the process 505, it is checked in step 510 whether the value of the IAB transmitted in the previous frame is "11". If the IAB is "11", the reverse data rate limit (RRL) value is increased in step 515 and then the data rate is adjusted within the increased RRL range in step 520. If the IAB is not "11" in step 510, the process checks whether the IAB is "01" in step 525. If the IAB is "01", it is determined whether the traffic-to-pilot ratio is increased in step 530 and whether the data transmission rate should be increased according to the increased T / P rate in step 535. If an increase in the data rate is required, the data rate is increased within the RRL range in step 520. On the contrary, if the increase in data rate is not necessary in step 535, the data rate is maintained in step 545. If the IAB is not " 01 " in step 525, that is, if the IAB is " 10 " or " 00, " maintains the current T / P rate in step 540 and then maintains the data rate in step 545.

If the CCB indicates DOWN in step 505, it is checked in step 550 whether the IAB is "11". If the IAB is "11", the current RRL is maintained in step 555, and the data rate is also maintained in step 560. If the IAB is not "11" in step 550, the process checks again whether the IAB is "10" in step 565. If the IAB is not "10", that is, if the IAB is "01" or "00", the current T / P rate is maintained in step 570, and the current data rate is also maintained in step 560. In contrast, when the IAB is "10" in step 565, the T / P rate is decreased in step 575, and it is determined whether or not the reduction in data rate is required according to the reduced T / P rate in step 580. If the data rate needs to be reduced according to the reduced T / P rate in step 580, the data rate is reduced in step 585. In contrast, if the data rate is not required to be reduced according to the reduced T / P rate in step 580, the current data rate is maintained in step 560.

However, if the data rate is limited by the battery limit of the terminal in the above-described process 501 to process 585, or if the data to be transmitted to the transmission buffer is limited, the battery rate is limited within the data rate range determined in the process 501 to process 585. Choose a data rate or T / P ratio that is sufficient to send the data remaining in the buffer or data rate.

After adjusting the RRL, T / P rate, and data rate in steps 501 to 585, it is checked whether the current RRL needs to be further increased in step 590. If there is no need to increase the current RRL further, the process 595 checks whether it is necessary to further increase the current data rate. If it is not necessary to further increase the data rate in step 595, that is, if the data rate may be decreased, the IAB is set to "10" in step 5100. If it is necessary to further increase the data rate in step 595, the IAB is set to "01" in step 5105. If it is necessary to increase the RRL in step 590, the IAB is set to "11" in step 5110.

If the IAB is set in steps 590 to 5110, the reverse data is transmitted through the R-SCH according to the data rate set in step 5115, and at the same time, the rate index according to the set IAB and the current data rate is set. The value is transmitted through the R-RICH.

6 is a flowchart illustrating a retransmission operation by a terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 6, in step 6-1, the terminal receives a feedback signal of Ack or Nack through the F-PANCH of the base station. However, it should be noted that since only the retransmission operation is concerned here, only the case where the terminal receives the NACK is shown. In step 6-5, the terminal analyzes the "N" value with the feedback information currently received. As mentioned above, "N" indicates the number of frames retransmitted by the base station. In the scheduling mode, "N" informs the number of retransmitted frames and the corresponding extension of "Duration." In step 6-10, it is determined whether to operate in the scheduling mode. In the case of the scheduling mode, steps 6 to 65 are performed. In case of “N = 00” in step 6-65, that is, in case of Null, there is no extension of the pre-assigned duration time, and in step 6-70 without extending the pre-assigned duration. Go directly to the frame and retransmit. At this time, the terminal transmits one retransmission frame to the base station. In addition, in a retransmission system operating based on NACK, feedback information is transmitted from a receiver to a transmitter even in the case of an Ack. In the case of such an Ack, "N = 00" is processed. If N = Null in steps 6-65, the duration previously allocated in steps 6-75 is extended by N times. As described above, i.e., if N = 2, it is extended by N * 2 times (frame duration + Alpha). In step 6-80, N number of retransmission frames are generated, and in step 6-45, the generated retransmission frames are retransmitted to the base station. If it is determined in operation 6-10 that the scheduling mode does not operate, steps 6-15 are performed. In this operation, the reverse link is configured as autonomous, and thus the terminal may omit the process of setting up a channel by transmitting a channel assignment message and transmitting a grant message from the base station.

In step 6-15, the terminal monitors the T / P and CCB. If it is determined in step 6-20 that both the T / P and CCB are "Up", that is, the T / P at the time of retransmission is increased compared to the T / P at the previous transmission, and also from the base station to the congestion control channel. This is the case when the CCB to be transmitted is increased. In this case, one retransmission frame is generated in step 6-50, the transmit power is increased in step 6-55, and the process proceeds to step 6-45 to perform the retransmission operation. In step 6-25, if the T / P is "Up" but the CCB is "Down," the number of frames to be retransmitted is determined according to the "N" value specified by the base station in steps 6-85. After reducing the transmission power, proceed to step 6-45 to perform the retransmission operation. In step 6-30, if the T / P is "Down" and the CCB is "Up", perform steps 6-85. Otherwise, in step 6-35, generate "N" retransmission frames, and step 6 After increasing the transmission power at -40, proceed to step 6-45 to perform the retransmission operation.

7 is a flowchart illustrating a retransmission operation by a base station according to an embodiment of the present invention.

Referring to FIG. 7, in step 7-1, the base station receives a frame transmitted from the terminal through the R-SCH. In step 7-5, check whether an error has occurred in the currently received frame. If a frame in which an error does not occur is received in step 7-5, in step 7-10, the "ReTx_N" value of feedback information to be transmitted to the terminal is mapped to "Null", and in step 7-15, an Ack is generated and then step 7 In addition to the Ack generated at -20, "ReTx_N = Null" is transmitted to the UE through the F-PANCH. Alternatively, except for the ReTx_N part, only Ack may be transmitted. On the contrary, if the base station receives a frame in which an error occurs in step 7-5, in step 7-25 the "ReTx_N" value is mapped to an arbitrary value other than "Null". In this case, the criterion for mapping the value of "ReTx_N" may vary according to an implementation method. However, as an example, "ReTx_N" may be mapped to 2 or more in consideration of a case where an error continuously occurs. If it is mapped to "ReTx_N = 1", the base station operates in the same manner as the request for retransmission like the normal retransmission operation. After mapping ReTx_N in step 7-25, the base station determines whether the terminal that currently requires retransmission in operation 7-30 operates in the scheduling mode. If the UE requesting retransmission is operating in the scheduling mode, the UE extends the value of "ReTx_N" mapped to the "Duration" time previously allocated to the UE in step 7-35. At this time, if ReTx_N = 1, the duration allocated in advance is not extended. And, marginal transmission time is set according to the already mentioned Alpha value. After the base station extends "Duration" in step 7-35, it generates a NACK in step 7-40, and transmits a ReTx_N value with the generated NACK to the terminal in step 7-45. If the terminal requesting retransmission in operation 7-30 is not operating in the scheduling mode, the terminal proceeds directly to operation 7-40 and performs a corresponding operation.

Meanwhile, another reverse data rate control method according to another embodiment of the present invention is illustrated in FIGS. 8 and 9.

First, the base station looks at the basic operation for selectively controlling the mobile station,

(1) If the terminal transmits a probing signal in the initial access state (Initial Access State), the operation that did not monitor the F-CPCCH, the success / failure (Success / Fail) for the probing signal (Probing Signal) In order to determine the ADR (allowable data rate) transmitted over the F-CDRCH and at the same time to monitor the congestion control bit (CCB) of the F-CPCCH.

(2) Even if the UE receives an ADR lower than the required initial data rate (hereinafter referred to as 'IADR'), if the UE receives a constant pattern or a continuous CCB pattern through the F-CPCCH (the embodiment of the present invention) In the example, when CCB = up is received), it is determined that its access is successful regardless of ADR, and R-SCH transmission is performed at the requested transmission rate.

(3) The base station transmits a success or failure signal in the form of CCB Up or Down through the F-CPCCH with the ADR to the UE. One embodiment of such a transmission pattern may determine success or fail as being dominant among CCBs received continuously or in an ADR-receiving interval.

<Operation of base station>

(a) The base station transmits the F-CDRCH and the F-CPCCH into the cell.

(b) When two or more terminals transmit a probing signal requiring the same data rate, when the base station cannot allow all of the terminals but only a part of them, arbitrarily transmits an Accept signal to a specific terminal as an F-CPCCH. do.

(c) The CCB Up is transmitted to the F-CPCCH and the UE is informed that the UE is accepted.

<Mobile station operation>

(a) After transmitting the probing signal, the terminal monitors the slot allocated to itself of the F-CPCCH secondly if the received ADR is smaller than the requested data rate (IADR). At this time, if CCB is Up, it is determined to be accepted and transmits an R-SCH.

8 is a control flow diagram of a mobile station for a data rate of the mobile station optionally according to an embodiment of the present invention. Hereinafter, a control flow at a mobile station for controlling a data rate of a selective mobile station according to an embodiment of the present invention will be described in detail with reference to FIG. 8.

In step 8-1, the terminal transmits an Initial Access Data Rate (IADR), which is an initial rate to be requested based on the ADR transmitted from the base station. At this time, the terminal transmits the IADR indicated by IAB = 00 to the base station along with a probing signal. Thereafter, after transmitting the IADR, the terminal monitors the ADR and the F-CPCCH transmitted from the base station in step 8-5. This is to check if the access is successful. That is, the terminal receives the Allowable Data Rate (ADR) transmitted by the base station and the Congestion Control Bit (CCB) transmitted through the F-CPCCH. The terminal checks whether a data rate greater than or equal to the IADR requested by the terminal is transmitted to the ADR in step 8-10. In other words, if the data rate is greater than or equal to the IADR requested by the ADR, the access is successful. Accordingly, the terminal transmits data through the R-SCH at the data rate (IADR) requested in step 8-15.

In contrast, if a data rate (ADR) smaller than IADR is received, the process proceeds to step 8-20. The terminal checks the value of the CCB in steps 8-20. That is, when the terminal receives the ADR lower than the IADR, the terminal checks the CCB of the F-CPCCH transmitted from the base station in order to confirm success of access. This is because, in the embodiment of the present invention, even when the UE receives an ADR lower than the IADR, when the UE receives the 'Up', the CCB is configured to consider that its access is successful. If CCB = Up is received in 20, the access is successful. Therefore, proceed to steps 8 to 15 to transmit data through the R-SCH at the requested data rate (IADR). However, in step 8-20, CCB = "Down. Receive "" means that its access failed. Therefore, the terminal proceeds to step 8-25 to perform the PV test to confirm the next access point.

9 is a control flowchart of a base station when selectively controlling the data rate of the terminal according to an embodiment of the present invention. Hereinafter, a process of selectively controlling data rate of a terminal in a base station according to the present invention will be described in detail with reference to FIG. 9.

The base station receives the IADR transmitted by the terminals in the cell in step 9-1. At this time, if the base station receives a probing signal set to IAB = 00, it determines that it is an IADR. Then, in step 9-5, the base station compares the data rates transmitted by all the terminals in the cell, and then obtains the sum of IADRs. After obtaining the sum of the IADRs, the base station compares the total capacity (ADR) that the base station can allocate in step 9-10 with the sum of the IADRs requested by the terminals. As a result of the comparison of the process 9-10, if the ADR allocated by the base station, that is, the total capacity is larger than the sum of the IADRs transmitted by the terminals, the base station proceeds to the process 9-15 to generate an ADR that can accommodate all the terminals Send to each terminal.

On the other hand, if the ADR that can be allocated by the base station is smaller than the sum of the IADRs transmitted by the terminals, the base station proceeds to step 9-20 and selects a specific terminal arbitrarily. That is, the randomly selected terminal is a case where the base station accepts the IADR of the selected terminal. Accordingly, the base station may select the terminal in consideration of the degree of data transmitted by the terminal, the characteristics of data to be transmitted by the terminal, and other fairness when the terminal is arbitrarily selected.

If any particular terminal is selected in step 9-20 using the method described above, the base station transmits CCB = "Up" to the terminal to allow initial access in step 9-25. This may inform the terminal that the IADR requested by the terminal is allowed. On the other hand, the base station transmits CCB = "Down" to inform the terminal that the initial access does not allow IADR is not allowed.

C. Data Transmission Apparatus According to Embodiment
FIG. 10 is a configuration diagram of a channel for transmitting ACK / NACK information on a packet in a forward direction according to an embodiment of the present invention. Hereinafter, the configuration and operation of a transmission channel of the forward packet ACK / NACK information according to the present invention will be described in detail with reference to FIG. 10.

The Forward Packet ACK / NACK Channel (F-PANCH), which is addressed in the present invention, is a channel transmitted in the forward direction. It serves to convey. The UE is instructed whether to retransmit each SCH (Supplemental Channel) and the number of times of retransmission by restoring 2 bits of ACK / NACK information and 2 bits of retransmission number information allocated to the UE in the F-PANCH received in the forward direction. The forward packet ACK / NACK channel transmission / reception method proposed by the present invention can be applied to other systems in addition to the 1xEV-DV system.

In the embodiment of FIG. 10, four bits are transmitted, two bits each for indicating whether the reverse SCH1 / SCH2 is retransmitted and the number of retransmissions when retransmitting. The Forward Packet ACK / NACK Channel (F-PANCH) of FIG. 10 may transmit retransmission information and retransmission count information for a total of 32 terminals. 16 terminals, terminals 0 to 15, transmit information about retransmission and retransmission information in phase. The other 16 terminals, terminals 16 to 31, are transmitted in quadrature phase. In the channel structure, the transmission position of the terminal and whether to transmit in the in-phase or quadrature phase is used to distinguish the terminal receiving the corresponding F-PANCH. This information is determined by the base station during call setup and notified to the terminal by signaling. .

Next, referring to FIG. 10, a configuration of a channel in which the number of two bits for retransmission and the two bits for retransmission are transmitted will be described. In addition, in the description of FIG. 10, since the In phase and the quadrature phase have the same structure, only the In phase structure will be described. Retransmission information for each terminal and 4 bits of retransmission information in retransmission are channel coded by the (12, 4) block encoders 1001-0 to 1001-15 to output 12 encoded symbols. The 384 coded symbols of 16 terminals output from the block encoders 1001-0 to 1001-15 of each (12, 4) are converted from a parallel signal to a serial signal by a parallel serial converter 1002-0. After conversion, the signal is mapped in Signal Mapping (1003-0) and then transmitted through orthogonal spreading. The length of the orthogonal function used for the orthogonal spreading may be 128.

In FIG. 10, the 4-bit information is described in the case of encoding the block code of (12, 4). However, (6, 4), (24, 4), or other block codes may also be applied. When the block code of (6, 4) is applied, the number of terminals that one F-PANCH can support is 64. On the contrary, when the block code of (24, 4) is applied, the number of terminals that one F-PANCH can support is 16. The coding rate of the applied block code may be differently applied depending on the performance required for the F-PANCH and the length of the available orthogonal code.

11 is a block diagram of a forward packet ACK / NACK information receiving channel according to an embodiment of the present invention. Hereinafter, the configuration and operation of a forward packet ACK / NACK information reception channel according to the present invention will be described in detail with reference to FIG. 11.

The signal received in FIG. 11 undergoes orthogonal despreading in the orthogonal despreader 1101 and receives channel compensation in the channel compensator 1102. After the channel compensation is completed, the (12, 4) decoder 1103 restores information on whether the SCH1 / SCH2 is retransmitted for the nth terminal and the number of retransmissions when retransmitted through the decoding process.

12 is a configuration diagram of a forward common data rate channel (“CDRCH”) transmission channel according to an embodiment of the present invention. Hereinafter, a configuration and an operation of the apparatus for transmitting forward common data rate information according to the present invention will be described in detail with reference to FIG. 12.

12 illustrates that the base station periodically transmits information about a maximum allowable data rate for the reverse direction in order to enable the terminal of the 1xEV-DV system to efficiently determine the data rate to be transmitted during initial data transmission through the reverse direction after accessing the system. The transmission channel structure of the forward common data rate channel (F-CDRCH) is shown.

The terminal that attempts to transmit data through the reverse packet data channel may receive the F-CDRCH to obtain information about the maximum allowable data rate in the reverse direction. In addition, the terminal determines the data rate to be transmitted in the reverse direction in consideration of the buffer amount of the terminal (representing the amount of data to be transmitted) and the surplus power amount of the terminal together with the information, and then the reverse data rate request channel (Data Rate Request). Channel). The UE continuously monitors the F-CDRCH and attempts to transmit at the data rate if the data rate indicated by the F-CDRCH is greater than or equal to the data rate requested by the UE. Otherwise, the process is repeated. The channel of the structure proposed in the present invention can be applied to other systems in addition to the 1xEV-DV system.

Next, the configuration and operation will be described according to the reference numerals of FIG. 12.

The block encoder 1201 generates code symbols by encoding 4-bit forward common data rate information every 20 ms. As the block encoder used herein, as shown in the drawing, code rates of (24, 4), (48, 4), (96, 4), (192, 4), and (384, 4) may be used. In addition, the sequence repeater 1202 receives the output code symbols of the block encoder 1201 as inputs and uses the number of repetitions of 16, 8, 4, 2, and 1 according to the illustrated code rates of the block encoder 1201, respectively. do. The sequence repeater 1202 generates and outputs 384 symbols every 20 ms. The QPSK modulator 1203 receives the output of the sequence repeater 1202 as an input and performs QPSK modulation to generate 192 modulation symbols every 20 ms. The Walsh spreaders 1204-0 and 1204-1 receive a signal output from the QPSK modulator 1203 as an input, and spread and output a Walsh function having a length of 128 for each of I and Q channels.

13 is a configuration diagram of a forward common data rate information receiving channel according to an embodiment of the present invention. Hereinafter, a block configuration and operation of a forward common data rate information reception channel according to an embodiment of the present invention will be described with reference to FIG. 13.

The Walsh despreaders 1301-0 and 1301-1 despread 24,576 chips every 20 ms using a length 128 Walsh function to generate 192 QPSK modulation symbols. The QPSK demodulator 1302 receives the outputs of the Walsh despreaders 1301-0 and 1301-1 and QPSK demodulates the signal to output 384 symbols every 20 ms. The sequence adder 1303 then sums the sequences the same number of repetitions used by the transmitter and outputs 24, 48, 96, 192, and 384 symbols according to the sum of 16, 8, 4, 2, and 1, respectively. . Accordingly, the block decoder 1304 receives the output of the sequence summer 1303 as an input, decodes it, and then obtains 4-bit forward common data rate information. Therefore, the receiver can check the retransmission number of 4 bits transmitted through the forward channel and data of retransmission.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

As described above, in the present invention, in the mobile communication system such as 1xEV-DO and 1xEV-DV, the mobile station stores a state in which the mobile station can increase the transmission rate of the mobile station, rather than the uniform control without considering the state of the mobile station. There is an advantage in that the base station efficiently performs overload control using a method for transmitting a state to the base station, thereby ensuring performance and capacity of the system. In addition, the present invention can consider the characteristics of the data currently being transmitted from each mobile station, there is an advantage that it is possible to efficiently control the reverse data rate for each mobile station.

Claims (65)

delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete In a mobile communication system comprising a plurality of terminals and a base station, a method for transmitting reverse data from any one of the plurality of terminals to the base station, Receiving information on an allowable maximum data rate determined by the base station in a first preset frame period; Determining a maximum data rate that the terminal can transmit within the received maximum data rate and requesting the base station to transmit data at the determined data rate; And transmitting data when the maximum data rate received from the base station is greater than the data rate required by the base station in a second frame period subsequent to the first frame period. . 39. The method of claim 38, further comprising: measuring a received traffic to pilot (T / P) rate from the base station in the data transmission and adjusting a transmission rate of data transmitted according to the measurement result Data transfer method. 39. The method of claim 38, wherein the allowable data rate is determined in consideration of power margins to prevent each of the plurality of terminals from transmitting data at the same data rate at the same time. 39. The method of claim 38, wherein the terminal determines the maximum data rate that can be transmitted by the terminal in consideration of the maximum allowable data rate determined by the base station as well as the power limit value information and the buffer state of the terminal. Reverse data transmission method. 39. The method of claim 38, further comprising transmitting a message requesting allocation of a new channel for data transmission to the base station when the maximum data rate is less than or equal to a predetermined minimum data rate. Data transfer method. 39. The method of claim 38, further comprising: when the maximum data rate is less than or equal to a predetermined minimum data rate, attempting to determine an access time point of the data transfer. 40. The method of claim 39, further comprising requesting the base station to transmit data at the adjusted data rate. 45. The method of claim 44, wherein the adjusted data rate is a value within a range of a predetermined rate limit value. 45. The method of claim 44, wherein the adjusted data rate is a value above a predetermined rate limit. delete In a mobile communication system comprising a plurality of terminals and a base station, a method for transmitting reverse data from any one of the plurality of terminals to the base station, In the initial transmission, receiving information on the maximum allowable data rate determined by the base station in a first predetermined frame period, and determines the maximum data rate that the terminal can transmit within the range of the received maximum data rate Request data transmission at the determined data transmission rate to the base station, and start data transmission when the maximum data transmission rate received from the base station is greater than the requested data transmission rate in a second frame period subsequent to the first frame period. Process, In continuous data transmission, the received traffic to pilot (T / P) rate is measured from the base station, the data rate is adjusted according to the measurement result, and transmitted according to the congestion control bit (CCB) received from the base station. To regulate the power, When retransmission is requested from the base station, retransmits a frame requiring retransmission to the base station at the data rate required for the initial transmission, and retransmits a number determined according to the variation of the received T / P rate from the base station and the CCB. And adjusting the transmit power of the frame. In a mobile communication system comprising a plurality of terminals and a base station, a method for transmitting reverse data from any one of the plurality of terminals to the base station, In the initial transmission, receiving information on the maximum allowable data rate determined by the base station in a first predetermined frame period, and determines the maximum data rate that the terminal can transmit within the range of the received maximum data rate Request data transmission at the determined data transmission rate to the base station, and start data transmission when the maximum data transmission rate received from the base station is greater than the requested data transmission rate in a second frame period subsequent to the first frame period. Process, In continuous data transmission, the received traffic to pilot (T / P) rate is measured from the base station, the data rate is adjusted according to the measurement result, and transmitted according to the congestion control bit (CCB) received from the base station. To regulate the power, When retransmission is requested from the base station, retransmitting a frame requiring retransmission to the base station at the data rate required for the initial transmission by the number of retransmission frames received from the base station. Way. A mobile communication system comprising a plurality of terminals and a base station, the method of the base station to provide data rate information to the terminal to transmit the reverse data to the base station of the plurality of terminals, Transmitting, to the respective terminals, information on an acceptable data rate determined by the base station in consideration of variation of transmission rates and transmission powers of the terminals in a first preset frame period; Computing a sum of data rates required by terminals in the base station when receiving information on data rates required by each terminal from one or more terminals that did not perform reverse transmission at a predetermined time point after the first frame period. Process, When the sum of the calculated data rates is less than or equal to the capacity value of the total data rate that can be allocated by the base station, information on an allowable data rate that can accommodate all of the plurality of terminals is included in the first frame period. Transmitting to all the terminals in a subsequent second frame period; When the sum of the calculated data rates is greater than the capacity value of the total data rate, the terminal requests a maximum data rate allowable for the selected terminal or a specific value within a range of data rate allocable from the total capacity of the base station. Selecting one of the plurality of terminals, and transmitting information on the determined allowable maximum data rate to the selected terminal in the second frame period subsequent to the first frame period. Data rate information providing method comprising a. 51. The method of claim 50, wherein the arbitrary terminal is selected in consideration of the class of the terminal, the amount of data to be transmitted from the terminal, and the characteristics of the data to be transmitted. In the reverse data transmission apparatus of the mobile communication system for data transmission: Base station, A plurality of terminals for transmitting reverse data to the base station; Any one terminal of the plurality of terminals, Receive information on an allowable maximum data rate determined by the base station in a first preset frame period, Determine a maximum data rate that the terminal can transmit within the range of the received maximum data rate and request the base station to transmit data at the determined data rate; And transmitting data when the maximum data rate received from the base station is greater than the requested data rate in a second frame period subsequent to the first frame period. 53. The method of claim 52, further comprising: measuring a received traffic to pilot (T / P) rate from the base station during the data transmission and adjusting a transmission rate of data transmitted according to the measurement result Transmission device. 53. The method of claim 52, wherein the base station determines the allowable maximum data rate in consideration of the power margin to prevent each of the plurality of terminals from transmitting data at the same data rate at the same time Reverse data transmission device. 53. The apparatus of claim 52, wherein the terminal determines a data rate in consideration of power limit value information and a buffer state as well as the maximum data rate. 53. The method of claim 52, wherein when the maximum data rate is less than or equal to a predetermined minimum data rate, the terminal further performs a process of transmitting a message requesting allocation of a new channel for data transmission to the base station. Reverse data transmission apparatus. 53. The reverse data of claim 52, wherein when the maximum data rate is less than or equal to a predetermined minimum data rate, the terminal further performs an attempt to re-determine an access point of data transmission. Transmission device. 54. The apparatus of claim 53, wherein the terminal further performs a process of requesting the base station to transmit data at the adjusted data rate. 54. The apparatus of claim 53, wherein the adjusted data rate is a value within a range of a predetermined rate limit value. 59. The apparatus of claim 58, wherein the adjusted data rate is greater than or equal to a predetermined rate limit. delete In the reverse data transmission apparatus of the mobile communication system for data transmission: Base station, A plurality of terminals for transmitting reverse data to the base station; Any one terminal of the plurality of terminals, In the initial transmission, receiving information on the maximum allowable data rate determined by the base station in a first predetermined frame period, and determines the maximum data rate that the terminal can transmit within the range of the received maximum data rate Request data transmission at the determined data transmission rate to the base station, and start data transmission when the maximum data transmission rate received from the base station is greater than the requested data transmission rate in a second frame period subsequent to the first frame period. and, In continuous data transmission, the received traffic to pilot (T / P) rate is measured from the base station, the data rate is adjusted according to the measurement result, and transmitted according to the congestion control bit (CCB) received from the base station. Regulate the power, When retransmission is requested from the base station, retransmits a frame requiring retransmission to the base station at the data rate required for the initial transmission, and retransmits a number determined according to the variation of the received T / P rate from the base station and the CCB. Reverse data transmission apparatus characterized by adjusting the transmission power of the frame. In the reverse data transmission apparatus of the mobile communication system for data transmission: Base station, A plurality of terminals for transmitting reverse data to the base station; Any one terminal of the plurality of terminals, In the initial transmission, receiving information on the maximum allowable data rate determined by the base station in a first predetermined frame period, and determines the maximum data rate that the terminal can transmit within the range of the received maximum data rate Request data transmission at the determined data transmission rate to the base station, and start data transmission when the maximum data transmission rate received from the base station is greater than the requested data transmission rate in a second frame period subsequent to the first frame period. and, In continuous data transmission, the received traffic to pilot (T / P) rate is measured from the base station, the data rate is adjusted according to the measurement result, and transmitted according to the congestion control bit (CCB) received from the base station. Regulate the power, And when retransmission is requested from the base station, retransmits the frame requiring retransmission to the base station at the data rate required for the initial transmission by the number of retransmission frames received from the base station. In the reverse data rate information providing apparatus of a mobile communication system for data transmission: Base station, A plurality of terminals for transmitting reverse data to the base station; The base station, Transmitting information on the allowable data rate determined by the base station to the respective terminals in consideration of the variation of the transmission rate and the transmission power of the terminals in the first frame period, When receiving information on the data rate required by each terminal from one or more terminals that did not perform the reverse transmission at a predetermined time point after the first frame interval, calculates the sum of the data rate required by the terminals in the base station; , When the sum of the calculated data rates is less than or equal to the capacity value of the total data rate that can be allocated by the base station, information on an allowable data rate that can accommodate all of the plurality of terminals is included in the first frame period. Transmit to all the terminals in a subsequent second frame period, If the sum of the calculated data rates is greater than the capacity value of the total data rate, a random terminal among the plurality of terminals is selected, and the value requested by the terminal for the maximum data rate allowable for the selected terminal or the base station Determine one of a specific value within a range of assignable data rates from the total capacity of and transmit information about the determined allowable maximum data rate to the selected terminal in the second frame section subsequent to the first frame section. Reverse data rate information providing apparatus. 65. The apparatus of claim 64, wherein the base station selects the arbitrary terminal in consideration of the class of the terminal, the amount of data to be transmitted from the terminal, and the characteristics of the data to be transmitted.

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