KR100906985B1 - Voice Call AMR Data Rate Controlling Method in Mobile Communication System - Google Patents

Abstract

The present invention relates to a voice call data rate control method of a mobile communication system that automatically adjusts a voice call data rate when it is undesirable to maintain a preset voice call data rate due to a change in wireless environment. Predicting a change in the downlink radio environment of the terminal during the call connection in real time through the amount of power allocated to the terminal and automatically adjusting the AMR rate, which is a voice call codec for the terminal, according to the amount of power allocated to the terminal, It predicts the change in the uplink radio environment of the terminal through the amount of power and automatically adjusts the AMR rate accordingly.

According to the present invention, it is possible to effectively control the transmission rate of the voice call AMR codec according to the change of the wireless environment during the call connection of the terminal to prevent the call disconnection situation of the user who has a bad wireless environment and adaptively change according to the change of the wireless environment. It is effective to provide high quality data service.

3GPP, AMR, UMTS, measurement

Description

Voice Call AMR Data Rate Controlling Method in Mobile Communication System

1 is a conceptual diagram schematically showing a voice call data rate control method of a mobile communication system according to the present invention;

FIG. 2 is a diagram illustrating a data flow in a voice call data rate control method according to an exemplary embodiment of the present invention, when data rate control in a downlink is simplified;

3 is a flowchart illustrating a method of controlling a rate in a downlink case in a method of controlling voice call data rate according to an embodiment of the present invention;

4 is a diagram illustrating a downlink rate control method of FIG. 3 graphically;

5 illustrates an example of downlink rate control according to FIG. 4;

6 is a diagram illustrating a data flow in the voice call data rate control method according to another preferred embodiment of the present invention, in which the data flow is controlled when the uplink rate is controlled;

7 is a flowchart illustrating a method for controlling a rate of an uplink in a voice call data rate control method according to another preferred embodiment of the present invention;

8 is a flowchart illustrating a method of controlling a rate in the uplink case in the voice call data rate control method shown in FIG.

9 is a diagram illustrating an example of uplink rate control according to FIG. 8.

<Description of Main Parts of Drawing>

10: SRNC 20: node-B

30: terminal

The present invention relates to a voice call data rate control method of a mobile communication system, and in particular, when it is undesirable to maintain a preset data rate due to a change in the wireless environment after a call call is set up, the call rate is automatically adjusted to disconnect the call. The present invention relates to a data rate control method of a mobile communication system which can improve call quality while preventing an error.

The mobile communication system is developing into a high speed, high quality wireless data packet communication system for providing data services and multimedia services as well as providing voice-oriented services at an early stage. In particular, UMTS (Universal Mobile Telecommunication), a third generation mobile communication system based on the European-style mobile communication system (GSM) and General Packet Radio Services (GPRS), and using broadband code division multiple access (CDMA) Systems provide services that enable mobile phone or computer users to transmit packet-based text, digitized voice or video and multimedia data at high speeds of 2Mbps or more, anywhere in the world. The UMTS system uses the concept of a packet switching method using a packet protocol such as the Internet protocol.

Meanwhile, 3GPP provides a voice service using a voice codec called AMR (Adaptive Multi-Rate). The AMR codec is used to transmit voice data at different rates by variably adjusting the bit rate.

In general, the AMR codec rate control is implemented in the call admission control step. In the call overload condition, the AMR codec rate control is performed by lowering the transmission rate mainly for users who are using a lot of radio resources in an ongoing call to secure new call radio resources. Is done.

However, in the current mobile communication system, since the system is not always operated in an overloaded state, the case where the algorithm is applied is very limited. In particular, when a terminal that is connected to a call gradually moves to a cell edge area, radio resources of downlink / uplink (DL / UL) are limited, and there is a possibility of call truncation due to failure to maintain AMR rate. Nevertheless, the algorithm does not operate selectively for such a terminal. Therefore, in case of the AMR codec rate control scheme according to the prior art, for example, if the wireless environment worsens during call connection, the call may be disconnected due to the limitation of the radio resources, and if the wireless environment improves, the imbalance of radio resource allocation may occur. There is a problem.

The present invention is to solve the above-mentioned problems of the prior art, by effectively controlling the variable data rate (AMR) to prevent the call disconnection situation of the user with a bad wireless environment and at the same time improve the quality of experience when the wireless environment is improved An object of the present invention is to provide a data rate control method of a mobile communication system capable of adaptively providing a voice service to a change in wireless environment.

In the voice call data rate control method of the mobile communication system according to the present invention for solving the above problems, the wireless environment of the terminal is changed in real time through the amount of power allocated to the terminal or transmitted by the terminal while the call is connected to the terminal In anticipation, when the wireless environment of the terminal is deteriorated, the AMR (Adaptive Multi-Rate) transmission rate is automatically adjusted upward, and when it is improved, the AMR transmission rate is automatically adjusted downward.

 The method may include transmitting a dedicated measurement initiation message to a terminal and a call node-B; The node-B calculates the amount of downlink power allocated to the terminal according to the received dedicated measurement message. The node-B notifies when the calculated power amount is equal to or greater than the first threshold value or less than the second threshold value for a predetermined time. Transmitting to a RNC (Radio Network Controller); And when the RNC determines the received notification message to inform that the message is greater than or equal to the first threshold value, the RNC downlinks the downlink data rate to the terminal and, when the message indicates that the message is less than or equal to the second threshold value, the downlink data. And increasing the data rate.

The method may further include transmitting a UE internal measurement control to the terminal when a call signal is connected to the terminal; The terminal calculates an amount of uplink power transmitted from the terminal according to the received measurement control message, and informs the user if the amount of power calculated is equal to or greater than the third threshold value or less than the fourth threshold value for a predetermined time. Transmitting to the RNC; And when the RNC determines the received notification message to inform that the message is greater than or equal to the third threshold value, the RNC down-regulates the uplink data rate of the terminal and, if the message indicates that the message is less than or equal to the fourth threshold value, the uplink data. And adjusting the rate.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

First, the mobile communication system according to the present invention is largely composed of a user equipment (UE), a UTRAN, and a core network (CN). The UTRAN consists of one or more Radio Network Sub-systems (RNS), and each RNS includes one RNC and one or more node-Bs managed by the RNC.

node-B is managed by the RNC and receives information from the physical layer of the transmitting terminal on the uplink, and transmits data to the receiving terminal on the downlink, thereby accessing the UTRAN to the terminal. Play a role.

In this case, a dedicated radio resource allocated to each terminal and an RNC in charge of call processing are called SRNCs. When the RNC boundary is moved during call connection, the RNC with call connection becomes SRNC before SRNC relocation occurs, and when the SRNC transfer occurs, the new RNC in the moved area becomes SRNC.

1 is a conceptual diagram illustrating a method of controlling a voice call data rate in a mobile communication system according to the present invention.

As shown in FIG. 1, the various data rates that can be set in the AMR are different in signal-to-interference ratio (Eb / No) values required for each data rate, and accordingly, coverage for smoothly performing call connection is provided. ) Is different. That is, when the data rate is set between the node-B and the terminal when the call connection is high, the coverage is formed in a relatively narrow range around the center, and the lower the data rate is formed in a relatively wide range, as illustrated in FIG. As the data rate, for example, gradually decreases from 12.2K to 7,95K, 5.9K, and 4.75K, the coverage that can maintain call connectivity gradually increases, and the required signal-to-interference ratio (Eb / No) decreases. do. The coverage for each AMR rate is limited by the wireless environment. The wireless environment is mainly changed by path loss, system load, signal interference, and the like, and the wireless environment is changed by the movement of the terminal.

Therefore, when the mobile station gradually moves to the coverage edge in the call connection state with the base station, when the wireless environment worsens and maintains the data rate set at the first call connection, in some cases, the call is disconnected during the call connection. Things will happen. In this case, the data rate control method according to the present invention predicts a situation in which the call cannot be maintained due to radio resource limitation in advance in the system, thereby lowering the AMR rate so that the connected call can be maintained as much as possible. When the wireless environment improves again, the data rate is readjusted to enable high quality data service.

To this end, the mobile communication system according to the present invention can configure a plurality of AMR modes and a plurality of data rates within each mode. A detailed description thereof will be described below with reference to Table 1 below.

AMR mode Representative bitrate AMR Mode # 1 Rate Combination 12.2K Choose from 12.2 Kbps, 7.95 Kbps, 5.9 Kbps, or 4.75 Kbps AMR Mode # 2 Rate Combination 10.2K Choose from 10.2 Kbps, 6.7 Kbps, 5.9 Kbps, or 4.75 Kbps AMR Mode # 3 Rate Combination 7.4K Choose from 7.4 Kbps, 6.7 Kbps, 5.9 Kbps, 4.75 Kbps

The AMR mode can be set in three types according to the state of the wireless environment, for example, as shown in Table 1, and the data rate selectable in each mode can be set in four types. In the example shown in Table 1, one of 12.2 Kbps, 7.95 Kbps, 5.9 Kbps, and 4.75 Kbps can be selected in the first mode, and 12.2 Kbps can be set as the initial transmission rate. Similarly, in the case of the second and third modes, one of several data rates shown in Table 1 may be selected, and the highest data rate value is preferably set initially.

Accordingly, the RNC, in particular the SRNC, attempts call processing by setting the selectable AMR mode and the data rate in the corresponding AMR mode at the initial call connection using the AMR codec.

In this case, it is preferable that the data rate provided for each mode can be made active or inactive according to the setting. This will be described with reference to Table 2 below.

Parameter Range Value Comment    AMR mode = 1  12.2K Active  Active Active: active, enabled Inactive Inactive: disabled, disabled  7.95K Active  Active Active: active, enabled Inactive Inactive: disabled, disabled  5.9K Active  Active Active: active, enabled Inactive Inactive: disabled, disabled  4.75K Active  Active Active: active, enabled Inactive Inactive: disabled, disabled

As shown in Table 2, in the mobile communication system according to the present invention, each transmission rate provided in the AMR mode is basically set to an active state, but a specific data rate may be set to inactive by adjustment. If a specific data rate is set to inactive, the data rate may not be used to adjust the data rate according to changes in the wireless environment described later. In Table 2, the active / inactive state for each data rate is shown only for Mode 1, but can be set as described above for each mode classified into Modes 2 and 3.

FIG. 2 is a diagram illustrating a data flow in a data rate control method according to an exemplary embodiment of the present invention when controlling the downlink rate.

The mobile communication system according to the present invention supports a dedicated measurement function defined in the 3GPP standard for the downlink power amount (AMR_Tx_Code_Pwr) value. Therefore, as shown in FIG. 2, a dedicated measurement initial message is transmitted to node-B to measure the amount of power User_AMR_Tx_Pwr transmitted to the terminal 30 after the AMR or AMR Multi-RAB call is established. . The node-B 20 measures the amount of power (User_AMR_Tx_Pwr) allocated to the terminal according to the received dedicated measurement initial message and reports it to the SRNC, and the SRNC transmits the downlink data rate of the terminal through the reported message. Adjust and reset the transmission format of the data through a radio bearer (RB). In this case, the resetting process through the wireless carrier applies a general method used in the UMTS, so a detailed description thereof will be omitted herein.

3 is a flowchart illustrating a method of controlling a data rate in a downlink case in a data rate controlling method according to an exemplary embodiment of the present invention. FIG. 3A is a flowchart illustrating a method related to event A of decreasing the data rate, and FIG. 3B is a flowchart illustrating a method related to event B of increasing the data rate.

As shown in FIG. 3 (a), in step S10a, node-B and a terminal attempt to connect a call signal by transmitting and receiving initial data for connection of an AMR or AMR Multi-RAB call.

When a call signal is connected in step S10a, the node-B and the terminal perform closed loop or open loop power control, and in step S20a, the SRNC directly managing node-B is a dedicated measurement message of the terminal to node-B connected to the terminal. transmit a dedicated measurement.

In step S30a, the node-B allocates the downlink power amount by the closed loop power control for every TTI (Transmit Time Interval) according to the received dedicated measurement message, and calculates a time-averaging value of the allocated power amount.

In general, since the TTI is set to 20 ms, the amount of downlink power allocated to each TTI for each terminal also changes rapidly. Therefore, since the amount of power allocated is not suitable for use in the present invention, the time average value User_AMR_Tx_Code_Pwr of the downlink power amount AMR_Tx_Code_Pwr updated every TTI is calculated and used to stably predict the wireless environment.

User_AMR_Tx_Code_Pwr [n] = (1-a) * User_AMR_Tx_Code_Pwr [n-1] + a * AMR_Tx_Code_Pwr [n]

(Where a = 1/2 ^ (K / 2))

The time average value of the amount of downlink power may be calculated according to Equation 1 described above. In this case, n included in each variable is the value at which the measurement time is set as the nth TTI, and 1 / a serves as a time constant for calculating the time average value.The constant K used here is set by the SRNC as the measurement coefficient value. Included in dedicated measurement messages sent to -B.

In step S40a, the node-B determines whether the calculated time average power amount is greater than a first threshold (Event A threshold) included in the dedicated measurement message, and when it is larger than the first threshold, the time average in step S60a. It is determined whether the power amount value keeps a value greater than the first threshold value for a predetermined time. The predetermined time for determining at this time is determined by the hysteresis time value according to the 3GPP standard.

In addition, when the time average power amount value for controlling the AMR rate does not maintain a value larger than the first threshold value during the hysteresis time value included in the dedicated measurement message and has a smaller value in the middle, the hysteresis measured in step S50a. The time is initialized and then measured again when the time average power value becomes larger than the first threshold value.

On the other hand, if the time average power value is greater than the first threshold value during hysteresis time in step S70a, an event A message is generated and transmitted to the SRNC. In step S80a, the SRNC reads the received event A message and the terminal connected to node-B. Adjust the data rate down by one step.

In addition, as shown in Figure 3 (b), when the call signal is connected in step S10b, the node-B and the terminal performs a closed loop or open loop power control and SRNC directly managing node-B in step S20b A dedicated measurement message of the terminal is transmitted to node-B connected to the terminal.

In step S30b, the node-B allocates the downlink power amount by the closed loop power control for every TTI according to the received dedicated measurement message, and calculates a time-averaging value of the allocated power amount.

In operation S40b, the node-B determines whether the calculated time average power amount is less than a second threshold (Event B threshold) included in the dedicated measurement message, and if the value is less than the second threshold, operation S60b. In step 2, it is determined whether the value of the time average power amount keeps a value smaller than the second threshold value for the hysteresis time.

At this time, since the time average power amount value for controlling the AMR rate should be kept larger than the second threshold value for the hysteresis time included in the dedicated measurement message, when the value is smaller than that, the time measured in step S50b is initialized. Measure again.

On the other hand, if the time average power value calculated in step S70b is less than the second threshold value during the hysteresis time, an event B message is generated and transmitted to the SRNC. In step S80b, the SRNC reads the received event B message and compares it with node-B. The data rate of the connected terminal is increased by one step.

FIG. 4 is a diagram illustrating a downlink rate control method of FIG. 3.

Referring to FIG. 4, starting from a time point when a time average value of the amount of downlink power allocated to a terminal exceeds a first threshold value, that is, an event A threshold, according to a dedicated measurement function defined in the 3GPP standard. Determine the amount of power during the hysteresis time. Therefore, if the time average power during the hysteresis time is maintained above the threshold value of event A, an event A message is generated at that point and transmitted to the SRNC managing the node-B. In addition, the SRNC reads the received event A message and adjusts the downlink data rate to the terminal connected to the node-B.

On the other hand, if the data rate is adjusted downward, the signal-to-noise ratio (Eb / No) value required at the adjusted rate is reduced, and the amount of power allocated to the terminal is also reduced. However, when the terminal is located in an area where the wireless environment is good, a relatively large amount of power is allocated to the terminal, and accordingly, the time average power amount is increased again, and when the threshold value of event A is exceeded, the above process is repeated.

In addition, when the wireless environment worsens, such as when the terminal moves to the outer region of the cell, the allocated power amount gradually decreases, and when the reduced power amount falls below the second threshold value (that is, the threshold value of event B), the time point Start with this to determine the amount of power during the hysteresis time. Therefore, if the time average power amount during the hysteresis time is kept below the threshold value of event B, the event B message is generated at the end of the hysteresis time and transmitted to the corresponding SRNC. In addition, the SRNC reads the received event B message and adjusts the downlink data rate to the terminal connected to the node-B.

As in the case of event A described above, if the data rate is adjusted upward, the amount of power allocated to the terminal is increased. However, when the terminal is located or moved in an area where the wireless environment is good, a relatively small amount of power is allocated. Accordingly, when the time average power amount decreases again and becomes less than the threshold value of event B, the above process is repeated. In this case, when the amount of power allocated to the terminal reaches the maximum power value, the call connection is disconnected because the radio resource can no longer be allocated to overcome the poor radio environment. Even in this bad area, the call connection can be maintained as much as possible to prevent disconnection.

5 is a diagram illustrating an example of downlink rate control according to FIG. 4.

As described above, the mobile communication system according to the present invention may set an AMR mode and a data rate according thereto, and may enable or disable various data rates. In addition, when an event A or event B message arrives from node-B, the data rate is reduced or increased by one step. When 5.9K is set to inactive state as shown in FIG. 5, the step 5.9K is skipped. The 7.95K and 4.75K steps (in the settings of AMR mode 1) are set according to the up or down adjustment.

Meanwhile, various parameters related to the downlink rate control according to the present invention described above may be set, for example, with reference to Table 3 below. In addition, whether or not to apply the downlink rate control algorithm according to the present invention in the mobile communication system may be selected according to the parameter setting in the SRNC.

Parameter Range (unit) Default Value Comment  DL_Upper_Threshold  0.00 ~ 1.00 (0.01)  0.9 Event A threshold (dBm) = Max_Code_Pwr + 10 * log (Value) -Max_Code_Pwr: Maximum value of Outer Loop PC  DL_Lower_Threshold  0.00 ~ 1.00 (0.01)  0.7 Event B threshold (dBm) = Max_Code_Pwr + 10 * log (value) -Max_Code_Pwr: Maximum value of OuterLoop PC Hysteresis time 1 to 6000 (10 ms) 64 Hysteresis time of event A, B rate_change_timer 0 to 19 (int) 16 K value for calculating time constant a

On the other hand, the data rate control method according to the present invention can be applied to the case of the uplink transmitted from the terminal to the node-B as well as the downlink.

First, in the data rate control method according to the present invention, the rate control of the uplink can be largely divided into two methods, one of which is adjusted in conjunction with the rate control of the downlink described above, the other is described above Independently of the downlink rate control, the uplink data rate control is performed to calculate and control the amount of uplink power according to the parameter setting in the SRNC considering the radio environment or resources.

In the case of interworking with downlink rate control, it depends on event A and event B occurring in downlink rate control. If downlink rate is adjusted by one step by event A message, uplink rate is also one step. If the downlink rate is increased by one step by the event B message, the uplink rate is also automatically increased by one step.

A case of separately calculating and controlling the amount of uplink data power in controlling the data rate of the uplink will be described below with reference to FIG.

FIG. 6 is a diagram illustrating a data flow in a data rate control method according to another preferred embodiment of the present invention when controlling the uplink rate.

In order to calculate and control uplink data power separately in controlling uplink data rate, UE Internal Measurement function defined in 3GPP standard is used. SRNC is connected to managed node-B and connected to AMR or AMR. The UE transmits a measurement control message (UE internal measurement control) for uplink power measurement to a UE (UE) 30 in which a multi-RAB call is established. The terminal determines the amount of transmission power (UE_Tx_Pwr) according to the received UE measurement control message and reports the result to the SRNC, the SRNC receives the report message and adjusts the uplink data rate up or down accordingly, and the radio carrier ( Node-B is controlled through the channel reset process through RB).

FIG. 7 is a flowchart illustrating a method for controlling an uplink rate in a data rate control method according to an exemplary embodiment of the present invention, and FIG. 7 (a) illustrates a method for event 6A for downwardly adjusting a data rate. 3 (b) is a flowchart illustrating a method related to event 6B of increasing the data rate.

First, in step S100a, the call signal between the node-B and the terminal is connected as in the downlink data rate control method. The SRNC transmits a measurement control message to the terminal when the AMR call and the AMR Multi-RAB call are established in step S110a.

In step S120a, the terminal calculates an uplink power value by closed loop power control every TTI, and calculates a time-averaging value of power calculated according to the received measurement control message.

In this case, the uplink power value UE_Tx_Pwr measured at the UE is updated every TTI like the power value allocated in the downlink described above, so it is not suitable for use in the present invention. User_UE_Tx_Pwr) is calculated and used.

User_UE_Tx_Pwr [n] = (1-a) * User_UE_Tx_Pwr [n-1] + a * UE_Tx_Pwr [n]

(Where a = 1/2 ^ (K / 2))

The time average value User_UE_Tx_Pwr of the amount of uplink power may be calculated according to Equation 2 described above. N included in each variable of Equation 2 is a TTI indicating a measurement time point as in the case of Equation 1 for calculating the average amount of downlink power, and 1 / a is a time constant and is set by the SRNC. It is determined according to the measurement coefficient K value included in the measurement control message transmitted to the controller.

In step S130a, the terminal determines whether the calculated time average power amount is greater than a third threshold (Event 6A threshold) included in the measurement control message, and when the value is greater than the third threshold, the time average in step S150a. It is determined whether the amount of power maintains a value greater than the third threshold value for a predetermined time. In addition, when the calculated time average power amount has a value smaller than the third threshold value in the middle, the time measured in step S140a is initialized and time is measured again. At this time, the determined time is determined by a time-to-trigger value according to the 3GPP standard to which the mobile communication system of the present invention is applied.

When the time average power calculated in step S160a is greater than the third threshold value during the time-to-trigger, an event 6A message is generated and transmitted to the SRNC. In step S170a, the SRNC reads the received event 6A message to determine the terminal's power. Adjust the uplink data rate one step down.

In addition, referring to FIG. 7 (b), when a call signal is connected in step S100b, the measurement control message is transmitted to the terminal in step S110b, and the terminal calculates a time average value of the amount of uplink data power in step S120b.

In step S130b, the terminal compares the calculated time average power amount value with a lower threshold (Event 6B threshold) to determine whether the time average power value is less than a fourth threshold value and is less than the fourth threshold value. If it is a value, it is determined whether the value of less than the fourth threshold value is maintained throughout the time-to-trigger in step S150b. In addition, as shown in FIG. 7A, when the amount of power is greater than the fourth threshold value in the middle of the time-to-trigger, the time-to-trigger which is being judged is initialized to determine again later.

Meanwhile, in step S160b, the UE generates an event 6B message and transmits the event 6B message to the SRNC at the end of time-to-trigger, and the SRNC reads the event 6B message received in step S170b to increase the uplink data rate of the UE by one step. Adjust

FIG. 8 is a graph illustrating the uplink rate control method of FIG.

Referring to FIG. 8, the time-to-trigger is determined from a time point when the amount of data transmission power measured by the terminal becomes greater than or equal to the third threshold value, that is, the event 6A threshold. Therefore, if the amount of power above the third threshold is maintained during the time-to-trigger, an event 6A message is generated and transmitted to the SRNC at the end of the time-to-trigger. Accordingly, the uplink data rate is lowered one step.

Like the downlink data rate control method according to the present invention described above, when the wireless environment worsens due to movement to the outer region of the cell, the transmission power value required by the terminal increases and becomes greater than the maximum power value that the terminal can transmit. If all event 6A occurs, the data rate is adjusted down. When the data rate is adjusted downward, the power value required by the terminal is reduced to prevent call disconnection. On the contrary, when the wireless environment improves, such as when the terminal moves to the center of the cell, the amount of data power transmitted from the terminal decreases, and when the wireless environment becomes good enough to cause event 6B, the transmission power value of the terminal becomes the fourth threshold. Value, that is, below the threshold of event 6B.

When the data power amount falls below the fourth threshold, the time-to-trigger is judged again. If the amount of outgoing power remains below the fourth threshold during this time, the event 6B ends when the time-to-trigger ends. A message will be generated and sent to the SRNC. In addition, the SRNC increases the data rate by one step according to the received event 6B message.

9 is a diagram illustrating an example of uplink rate control according to FIG. 8.

FIG. 9 illustrates a case in which a step 5.9K is inactivated among various data rates. As event 6A or event 6B occurs, various data rates are adjusted up or down one by one in a set AMR mode.

At this time, if 5.9K is deactivated, if it is adjusted downward from the adjacent 7.95K, the deactivated 5.9K is set to 4.75K, and if it is adjusted up from 4.75K, the 7.95K is set to skip 5.9K.

Meanwhile, various parameters related to the uplink rate control according to the present invention described above may be set, for example, as shown in Table 4 below.

Parameter Range (unit) Default Value Comment UL_Upper_Threshold -50 ~ 33dBm, int 20 event 6A threshold (dBm) UL_Lower_Threshold -50 ~ 33dbm, int 10 event 6B threshold (dBm) Time-to-trigger 1 to 5000 (10 ms) 200 time-to-trigger of event 6A, 6B Filter-coefficient 0 to 19 (int) 16 K value for calculating time constant a

As described above, the voice call data rate control method of the mobile communication system according to the present invention has been described with reference to the illustrated drawings, but the present invention is not limited to the embodiments and drawings disclosed herein, and a measurement function provided by 3GPP. It is apparent that the technical idea of the present invention, which can provide a voice service for a wireless environment by adjusting a voice call data rate by using the above, can be easily applied by those skilled in the art within a protected range.

The voice call data rate control method of the mobile communication system according to the present invention operating as described above can effectively control the transmission rate of the AMR codec by using the measurement function provided by the 3GPP standard, thereby reducing the call disconnection situation of the terminal having a bad wireless environment. It can prevent and can provide high quality data service actively according to the change of wireless environment.

Claims (13)

delete Transmitting a dedicated measurement initiation message to the node-B when a call signal is connected to the terminal; The node-B calculates the amount of downlink power allocated to the terminal according to the received dedicated measurement message. The node-B notifies when the calculated power amount is equal to or greater than the first threshold value or less than the second threshold value for a predetermined time. Transmitting to a RNC (Radio Network Controller); And The RNC determines the received notification message and downgrades the downlink data rate to the terminal when the message indicates that the message is equal to or greater than the first threshold value, and when the message indicates that the message is less than or equal to the second threshold value. Steps to increase bit rate Voice call data rate control method of a mobile communication system comprising a. The method of claim 2, The dedicated measurement message, the voice call data rate control method of the mobile communication system, characterized in that comprises a predetermined time, the first threshold value and the second threshold data. The method of claim 2, The RNC sets an initial data transmission mode and a data transmission rate when the call signal is connected. The method of claim 2, The RNC sets a voice call data rate control method of a mobile communication system, characterized by setting whether or not to utilize two or more data rates classified for each data transmission mode. The method of claim 2, The transmitting of the notification message may include calculating a time average value User_AMR_Tx_Code_Pwr of the downlink power amount AMR_Tx_Code_Pwr of the terminal allocated every transmission time interval (TTI); Determining whether the calculated time average power amount is greater than or equal to the first threshold value or less than the second threshold value for a predetermined time; In response to the determination, if the first threshold value is greater than or equal to the first threshold value, the RNC transmits an event A message for lowering the transmission rate to the RNC, and if the second threshold value is lower than the second threshold value for the predetermined time, the event B message is increased. To send to Voice call data rate control method of a mobile communication system comprising a. The method of claim 6, And calculating the downlink average power amount (User_AMR_Tx_Code_Pwr) according to the following equation. User_AMR_Tx_Code_Pwr [n] = (1-a) * User_AMR_Tx_Code_Pwr [n-1] + a * AMR_Tx_Code_Pwr [n] (A = 1/2 ^ (K / 2), where n is the value at which the time-averaged power amount is calculated as the nth TTI, and K is the measurement coefficient. The method of claim 7, wherein The dedicated measurement message is a voice call data rate control method of a mobile communication system is transmitted to the node-B including the value of the measurement coefficient K. The method of claim 2, The data rate adjustment step further comprises the step of adjusting the data rate of the uplink (uplink) in conjunction with the data rate of the downlink further comprises the step of controlling the voice call data rate of the mobile communication system. Transmitting a UE internal measurement control to the terminal when a call signal is connected to the terminal; The terminal calculates an amount of uplink power transmitted from the terminal according to the received measurement control message, and if the calculated amount of power is equal to or greater than the third threshold value or less than the fourth threshold value for a predetermined time, the RNC informs of the notification message. Transmitting to; And If the RNC determines the received notification message to indicate that the message is greater than or equal to the third threshold value, the RNC down-regulates the uplink data rate of the terminal and, if the message indicates that the message is less than or equal to the fourth threshold value, the uplink data rate. Step to raise Voice call data rate control method of a mobile communication system comprising a. The method of claim 10, The transmitting of the notification message may include calculating a time average value UE_Tx_Pwr of the amount of uplink power controlled for each TTI; Determining whether the calculated time average power amount is greater than or equal to the third threshold value or less than or equal to the fourth threshold value for a predetermined time; If the determination result is greater than or equal to the third threshold value for the predetermined time, transmitting an event 6A message to the RNC, and if it is less than or equal to the fourth threshold value, transmitting an event 6B message to the RNC. Voice call data rate control method of a mobile communication system comprising a. The method of claim 11, The calculating of the time average power amount of the uplink is a voice call data rate control method of a mobile communication system, characterized in that calculated according to the following equation. User_UE_Tx_Pwr [n] = (1-a) * User_UE_Tx_Pwr [n-1] + a * UE_Tx_Pwr [n] (A = 1/2 ^ (K / 2), where n is the value at which the time-averaged power amount is calculated as the nth TTI, and K is the measurement coefficient. The method of claim 12, The measurement control message is a voice call data rate control method of a mobile communication system, characterized in that it comprises a value of the measurement coefficient K.

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