KR20120072453A - Method and device for controlling amr transmission rate - Google Patents

Abstract

PURPOSE: An AMR(Adaptive Multi-Rate) transmission rate control apparatus is provided to divide a trigger standard for controlling the change of a transmission rate according to each transmission rate. CONSTITUTION: A storage unit(307) stores transmission rate control mode information of a backward link and transmission rate control mode information of a forward link. A transmission rate control unit(205) reads events within a measurement report message of a base station or a portable terminal. The transmission rate control unit selects a transmission rate control mode from the stored transmission rate control modes. The transmission rate control unit reduces or increases AMR transmission rates according to the selected transmission rate control mode.

Description

AMR transmission rate control method and its apparatus {METHOD AND DEVICE FOR CONTROLLING AMR TRANSMISSION RATE}

The present invention relates to an AMR rate control method and apparatus therefor.

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

Typically, the AMR codec rate control is generally implemented in a call admission control step. In order to secure a new call radio resource under an overload condition of the system, a transmission rate is lowered mainly for a user who is using a lot of radio resources.

In this case, a plurality of data rates may be configured in various AMR modes and in each mode. Among the AMR modes, AM1, AM2, and AM3 are composed of rate combinations, and each mode is mapped to a representative transmission rate among 12.2 Kbps, 10.2 Kbps, 7.95 Kbps, 7.4 Kbps, 6.7 Kbps, 5.9 Kbps, and 4.75 Kbps. It is. By using these data rates, the data rate is dynamically controlled to reduce the radio link load and to improve the radio quality of the cell boundary area.

This AMR rate control is divided into a forward link (or downlink) and a reverse link (or uplink).

In this case, in the case of the forward link (or downlink), as shown in FIG. 1, event A for lowering the data rate and event B for upwardly adjusting the data rate are defined.

1 graphically illustrates a forward link algorithm.

Referring to FIG. 1, two thresholds exist between the maximum power Max_Code_Power and the minimum power Min_Code_Power. In other words, event A Threshold and event B Threshold exist.

When a predetermined time (Hysteresis Time) has elapsed since the measurement power (Tx_Code_Power) exceeds the event A threshold, the base station (not shown) transmits an event A measurement report to the base station control device (not shown), and the base station control device (not shown) Decreases the transmission rate (AMR Rate Down).

In addition, if a hysteresis time has elapsed since the measurement power Tx_Code_Power is lower than the event B threshold, the base station (not shown) transmits an event B measurement report to the base station control device (not shown), and the base station control device (Not shown) increases the rate (AMR Rate Up).

In addition, in the case of the reverse link (or uplink), as illustrated in FIG. 2, event 6A for raising the data rate and event 6B for increasing the data rate are defined.

2 graphically illustrates a conventional reverse link algorithm.

2, there are two thresholds. That is, event 6A Threshold and event 6B Threshold exist.

When the measurement power UE_Tx_Power exceeds the event 6A threshold, when a hysteresis time has elapsed, the mobile station (not shown) transmits an event 6A measurement report to a base station control device (not shown) and the base station control device (not shown). Decreases the transmission rate (AMR Rate Down).

In addition, when a predetermined time (Hysteresis Time) has elapsed since the measurement power UE_Tx_Power is lower than the event 6B threshold, the mobile terminal (not shown) transmits an event 6B measurement report to a base station control device (not shown) and controls the base station. The device (not shown) increases the rate (AMR Rate Up).

However, as a single threshold of Event A and Event B or Event 6A and Event 6B is commonly applied to all rate states, TX code power of a forward link or power of a reverse link mobile terminal and transmission rate according to a radio wave environment The disadvantage is that it does not reflect the state.

Accordingly, an object of the present invention is to provide a method and apparatus for controlling an AMR rate control by dividing a trigger criterion for rate change to reflect various rate states according to a propagation environment. To provide.

According to one aspect of the invention there is provided a base station control apparatus. In the base station apparatus for controlling adaptive multi-rate (AMR) transmission rate, the apparatus includes a plurality of power upper limit thresholds and lower limit thresholds for reducing or increasing different transmission rates for a plurality of transmission rate control modes. A storage unit for storing rate control mode information and rate control mode information of a reverse link; And reading a event included in a measurement report message received from a base station or a mobile terminal, selecting a rate control mode corresponding to the event from among a plurality of rate control modes stored in the storage, and as defined in the selected rate control mode. And a rate controller for increasing or decreasing the AMR rate.

According to another feature of the present invention, an AMR rate control method is provided. The method includes: a method for controlling adaptive multi-rate (AMR) transmission rate, the method comprising: requesting, by a base station controller, a power measurement from a base station or a mobile terminal; Receiving a measurement report message from the base station or mobile terminal; Confirming an event included in the measurement report message; Selecting a rate control mode corresponding to the event; And increasing or decreasing the AMR rate as defined in the rate control mode.

According to another feature of the present invention, an AMR rate control method is provided. The method includes: a method for controlling adaptive multi-rate (AMR) transmission rate, the method comprising: receiving a power measurement request from a base station or a mobile station from a base station control apparatus; Extracting a plurality of trigger information set for each of a plurality of rate control modes, wherein the rate control mode includes a rate increase event or a rate decrease event from the power measurement; Determining corresponding trigger information from the plurality of trigger information extracted by measuring power allocated to the mobile terminal; And transmitting a measurement report including a rate control event according to trigger information corresponding to the measured power to the base station, wherein the rate control event includes a specific AMR rate control mode among the plurality of AMR rate control modes. It includes a rate increase event or a rate decrease event for.

According to an embodiment of the present invention, by changing the trigger criteria for dynamic rate control in AMR mode by rate, it is possible to perform a rate change that reflects the actual wireless environment. Thus, optimized radio quality and load mitigation effects are expected when compared to conventional rate control techniques.

1 graphically illustrates a forward link algorithm.
2 graphically illustrates a conventional reverse link algorithm.
3 graphically illustrates a forward link algorithm according to an embodiment of the present invention.
4 is a table illustrating a forward link rate change scheme according to an embodiment of the present invention.
5 graphically illustrates a reverse link algorithm according to an embodiment of the invention.
6 is a table showing a reverse link rate change scheme according to an embodiment of the present invention.
7 is a block diagram showing the configuration of a base station control apparatus according to an embodiment of the present invention.
8 is a flowchart illustrating a method of controlling AMR rate of a forward link according to an embodiment of the present invention.
9 is a flowchart illustrating a method of controlling AMR rate of a reverse link according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

In this specification, the user terminal is a mobile station (MS), a terminal (terminal), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), a user device May refer to a user equipment (UE), an access terminal (AT), and the like, and may include all or some functions of a mobile terminal, a subscriber station, a portable subscriber station, a user device, and the like.

In the present specification, a base station (BS) is an access point (AP), a radio access station (Radio Access Station, RAS), a Node B (Node B), a base transceiver station (Base Transceiver Station, BTS), MMR ( Mobile Multihop Relay) -BS and the like, and may include all or part of functions such as an access point, a radio access station, a Node B, a base transceiver station, and an MMR-BS.

Hereinafter, an AMR rate control method and apparatus thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a graph of a forward link algorithm according to an embodiment of the present invention, and FIG. 4 is a table showing a forward link rate change scheme according to an embodiment of the present invention.

4, the forward rate control information 100 includes a forward link rate control reference item 101 and an AMR rate state transition item 103.

The forward link rate control reference item 101 includes a plurality of forward rate increase events or decrease events. Each event stores rate control information for each AMR state of the AMR Rate State transition item 103.

First, referring to FIG. 3, there are six thresholds in total between the maximum power Max_Code_Power and the minimum power Min_Code_Power. That is, there are three event A thresholds and three event B thresholds.

If a predetermined time (Hysteresis Time) has elapsed since the measurement power Tx_Code_Power exceeds the event A-1 threshold, the base station (not shown) transmits an event A-1 measurement report to the base station control device (not shown).

Referring to FIG. 4, the base station controller (not shown) performs a rate change corresponding to the AMR Rate State corresponding to event A-1. In AM1 mode, the rate is reduced from 12.2K to 7.95K. In AM2 mode, the rate is reduced from 10.2K to 6.7K. In AM3 mode, the rate is reduced from 7.4K to 6.7K.

In addition, referring to FIG. 3, if a hysteresis time has elapsed since the measured power Tx_Code_Power exceeds the event A-2 threshold, the base station (not shown) measures the event A-2 to the base station control device (not shown). Send the report.

Referring to FIG. 4, the base station controller (not shown) performs a rate change corresponding to the AMR Rate State corresponding to event A-2. In AM1 mode, the rate is reduced from 7.95K to 5.9K. In AM2 mode and AM3 mode, the transmission rate is reduced from 6.7K to 5.9K.

In addition, referring to FIG. 3, when a predetermined time (Hysteresis Time) has elapsed since the measured power Tx_Code_Power exceeds the event A-3 threshold, the base station (not shown) measures the event A-3 to the base station control device (not shown). Send the report.

Referring to FIG. 4, the base station controller (not shown) performs a rate change corresponding to the AMR Rate State corresponding to event A-3. In AM1 mode, AM2 mode, and AM3 mode, the transmission rate is reduced from 5.9K to 4.75K.

Meanwhile, referring to FIG. 3, when a measurement time Tx_Code_Power exceeds an event B-3 threshold, a base station (not shown) measures event B-3 by a base station control device (not shown). Send the report.

Referring to FIG. 4, the base station controller (not shown) performs a rate change corresponding to the AMR Rate State corresponding to event B-3. In AM1 mode, AM2 mode, and AM3 mode, the data rate is increased from 4.75K to 5.9K.

In addition, referring to FIG. 3, if a hysteresis time has elapsed since the measured power Tx_Code_Power exceeds the event B-2 threshold, the base station (not shown) measures the event B-2 by the base station control device (not shown). Send the report.

Referring to FIG. 4, the base station controller (not shown) performs a rate change corresponding to the AMR Rate State corresponding to event B-2. In AM1 mode, the data rate is increased from 5.9K to 7.95K. In AM2 mode and AM3 mode, the data rate is increased from 5.9K to 6.7K.

In addition, referring to FIG. 3, if a hysteresis time has elapsed since the measured power Tx_Code_Power exceeds the event B-1 threshold, the base station (not shown) measures the event B-1 to the base station control device (not shown). Send the report.

Referring to FIG. 4, the base station controller (not shown) performs a rate change corresponding to the AMR Rate State corresponding to event B-1. In AM1 mode, increase from 7.95K to 12.2K. In AM2 mode, increase from 6.7K to 10.2K. In AM3 mode, the data rate is increased from 6.7K to 7.4K.

5 graphically illustrates a reverse link algorithm according to an embodiment of the present invention, and FIG. 6 is a table illustrating a rate change scheme according to an embodiment of the present invention.

6, the reverse rate control information 200 includes a reverse link rate control reference item 201 and an AMR rate state transition item 203.

The reverse link rate control reference item 201 contains a plurality of reverse rate increase events or decrease events. Each event includes rate control information for each AMR state of the AMR Rate State transition item 203.

First, referring to FIG. 5, a total of six thresholds exist between a terminal maximum power Max_UE_Power and a minimum power Min_UE_Power. That is, there are three event 6A thresholds and three event 6B thresholds.

When a measurement time Tx_UE_Power exceeds the event 6A-1 threshold, a mobile terminal (not shown) transmits an event 6A-1 measurement report to a base station control device (not shown).

Referring to FIG. 6, the base station controller (not shown) performs a rate change corresponding to the AMR Rate State corresponding to event 6A-1. In AM1 mode, the rate is reduced from 12.2K to 7.95K. In AM2 mode, the rate is reduced from 10.2K to 6.7K. In AM3 mode, the rate is reduced from 7.4K to 6.7K.

In addition, referring to FIG. 5, if a hysteresis time has elapsed since the measured power Tx_UE_Power exceeds the event 6A-2 threshold, the mobile terminal (not shown) transmits the event 6A- to the base station controller (not shown). 2 Send the measurement report.

Referring to FIG. 6, the base station controller (not shown) performs a rate change corresponding to the AMR Rate State corresponding to event 6A-2. In AM1 mode, the rate is reduced from 7.95K to 5.9K. In AM2 mode and AM3 mode, the transmission rate is reduced from 6.7K to 5.9K.

In addition, referring to FIG. 5, if a hysteresis time has elapsed since the measured power Tx_UE_Power exceeds an event 6A-3 threshold, the mobile terminal (not shown) sends an event 6A− to the base station controller (not shown). 3 Send the measurement report.

Referring to FIG. 6, the base station controller (not shown) performs a rate change corresponding to the AMR Rate State corresponding to event 6A-3. In AM1 mode, AM2 mode, and AM3 mode, the transmission rate is reduced from 5.9K to 4.75K.

Meanwhile, referring to FIG. 5, if a hysteresis time has elapsed since the measured power Tx_UE_Power exceeds the event 6B-3 threshold, the mobile terminal (not shown) sends an event 6B− to the base station controller (not shown). 3 Send the measurement report.

Referring to FIG. 6, the base station controller (not shown) performs a rate change corresponding to the AMR Rate State corresponding to event 6B-3. In AM1 mode, AM2 mode, and AM3 mode, the transmission rate is increased from 4.7K to> 5.9K.

In addition, referring to FIG. 5, if a hysteresis time has elapsed since the measured power Tx_UE_Power exceeds the event 6B-2 threshold, the mobile terminal (not shown) sends an event 6B− to the base station controller (not shown). 2 Send the measurement report.

Referring to FIG. 6, the base station controller (not shown) performs a rate change corresponding to the AMR Rate State corresponding to event 6B-2. In AM1 mode, the data rate is increased from 5.9 to 7.95K. In AM2 mode and AM3 mode, the data rate is increased from 5.9K to 6.7K.

In addition, referring to FIG. 5, if a hysteresis time has elapsed since the measured power Tx_UE_Power exceeds the event 6B-1 threshold, the mobile terminal (not shown) sends an event 6B− to the base station controller (not shown). 1 Send the measurement report.

Referring to FIG. 6, the base station controller (not shown) performs a rate change corresponding to the AMR Rate State corresponding to event 6B-1. In AM1 mode, the rate is increased from 7.95 to 12.2K. In AM2 mode, the rate is increased from 6.7K to 10.2K. In AM3 mode, the data rate is increased from 6.7K to 7.4K.

As such, by dividing the power threshold differently from the prior art, it is possible to control the transmission rate in various ways by reflecting the states of various propagation environments that are detected through the measured power. This is different from the conventional rate control method, which could only increase or decrease the rate by comparing one threshold with measured power.

Now, a configuration of the base station control apparatus for performing the above-described AMR rate control will be described with reference to FIG. 7.

7 is a block diagram showing the configuration of a base station control apparatus according to an embodiment of the present invention. At this time, only the configuration related to the AMR rate control is briefly shown.

Referring to FIG. 7, the base station control apparatus 300 includes a request unit 301, a receiver 303, a rate controller 305, and a storage unit 307.

The requester 301 transmits a power measurement message requesting power measurement to a base station (not shown) or a mobile terminal (not shown). In this case, the power measurement message includes a plurality of rate increase or decrease events shown in FIGS. 4 and 6, and respective power upper limit thresholds and lower limit thresholds set in the respective events described with reference to FIGS. 3 and 5.

The receiver 303 includes an increase event or a decrease event corresponding to a power value measured from a base station (not shown) or a mobile terminal (not shown) and a measured power value according to a power measurement message transmitted by the requesting unit 301. The received measurement report message.

The rate control unit 305 reads the event included in the measurement report message received by the receiving unit 303. The data rate control mode corresponding to the read event is selected from the plurality of data rate control modes stored in the storage unit 307. The AMR rate is increased or decreased as defined in the selected rate control mode.

The storage unit 307 stores the rate control mode information of the forward link and the rate control mode information of the reverse link including a plurality of power upper limit thresholds and lower limit thresholds for different rate reduction or increase for each rate control mode. do. That is, the power upper limit threshold and the lower limit threshold described in FIGS. 3 and 5 and the rate control mode information in the form of the table described in FIGS. 4 and 6 are stored.

The base station control apparatus controls the AMR rates of the forward link and the reverse link, respectively, which will be described with reference to FIGS. 8 and 9.

8 is a flowchart illustrating a method of controlling AMR rate of a forward link according to an embodiment of the present invention.

Referring to FIG. 8, after the AMR Multi-RAB call setup (S101) between the base station control apparatus 300, the base station (not shown), and the mobile terminal (not shown), the requesting unit 301 of the base station control apparatus 300 is A dedicated measurement initial message is transmitted to a base station (not shown) for measuring the amount of power User_AMR_Tx_Power transmitted to the mobile terminal (not shown) (S103).

In this case, the dedicated measurement initial message may include a plurality of upper limit thresholds set for a plurality of forward rate control events (event A-1, event A-2, event A-3, event B-1, event B-2, and event B-3). And lower threshold information.

Then, the base station (not shown) measures the power allocated to the user terminal (not shown) according to the received dedicated measurement initial message (S105). For example, the power of the forward dedicated physical data channel (DPDCH) can be measured.

The base station (not shown) compares the measured power with a plurality of upper and lower threshold information received in step S103 to determine corresponding threshold information, and determines a plurality of rate control events (event A-1, event A-2, The rate control event set in the threshold information among the event A-3, event B-1, event B-2, and event B-3) and the power value measured in step S105 are included in the dedicated measurement report message. To the base station control apparatus 300 (S107).

Then, the base station control apparatus 300 readjusts the forward AMR transmission rate of the terminal through the message reported in step S107 (S109). That is, it increases or decreases the transmission rate. The transmission format of the data is reset through the radio bearer (RB) (S111). Here, the resetting process through the wireless carrier applies a general method used in the Universal Mobile Telecommunications System (UMTS), and thus a detailed description thereof will be omitted herein.

9 is a flowchart illustrating an AMR rate control method of a reverse link according to an embodiment of the present invention.

Referring to FIG. 9, after the AMR Multi-RAB call setup (S201) between the base station controller 300 and the mobile terminal (not shown), a dedicated measurement initial message is transmitted to the mobile terminal (not shown). (S203).

In this case, the dedicated measurement initial message may include a plurality of upper limit thresholds set for each of a plurality of reverse rate control events (event 6A-1, event 6A-2, event 6A-3, event 6B-1, event 6B-2, and event 6B-3). And lower threshold information.

Then, the mobile terminal (not shown) measures the power of the reverse link (S205), for example, can measure the power of the reverse DPDCH. In this case, the mobile terminal (not shown) may calculate the uplink power value by the closed loop power control every TTI and calculate a time-averaging value of the power amount calculated according to the received measurement control message.

The mobile terminal (not shown) compares the measured power with a plurality of upper and lower threshold information received in step S203 to determine corresponding threshold information, and determines a plurality of reverse rate control events (event 6A-1 and event 6A). -2, event 6A-3, event 6B-1, event 6B-2, event 6B-3), the base station including the rate control event set in the threshold information and the power value measured in step S205 in the dedicated measurement report message. The control device 300 transmits (S207).

Then, the base station control apparatus 300 reads the rate control event included in the message reported in step S207 to readjust the reverse AMR rate of the mobile terminal (not shown) (S209). That is, it increases or decreases the transmission rate. Then, the transmission format of data is reset through the radio bearer (RB) (S211).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (9)

In the base station apparatus for controlling the adaptive multi-rate (AMR) transmission rate,
A storage unit storing rate control mode information of the forward link and rate control mode information of the reverse link including a plurality of power upper limit thresholds and lower limit thresholds for different rate reduction or increase for each of the plurality of rate control modes; And
Reads an event included in a measurement report message received from a base station or a mobile terminal, selects a rate control mode corresponding to the event from among a plurality of rate control modes stored in the storage, and selects the AMR as defined in the selected rate control mode. Rate control to increase or decrease the rate
Base station control apparatus comprising a. The method of claim 1,
The plurality of rate control modes exist for each forward link or reverse link, and include a plurality of rate increase or decrease events, in which information of a second rate to be increased or decreased in the first rate is mapped and stored for each AMR rate state.
The rate control mode is,
And selecting an increase or decrease event corresponding to an event included in the measurement report message from the storage unit, and increase or decrease the AMR rate at a second rate stored in the selected increase or decrease event. The method of claim 2,
A request unit for transmitting a power measurement message including the plurality of transmission rate increase or decrease events, and each power upper limit threshold and lower limit threshold set in each event to a base station or a mobile terminal.
Base station control apparatus further comprising. The method of claim 3,
Receiving unit for receiving the measurement report message including the power event measured from the base station or the mobile terminal and the increase or decrease event corresponding to the measured power value in accordance with the power measurement message transmitted by the requesting unit
Base station control apparatus further comprising. In the adaptive multi-rate (AMR) transmission rate control method,
Requesting, by the base station controller, power measurement from the base station or the mobile terminal;
Receiving a measurement report message from the base station or mobile terminal;
Confirming an event included in the measurement report message;
Selecting a rate control mode corresponding to the event; And
Increasing or decreasing the AMR rate as defined in the rate control mode
AMR rate control method comprising a. The method of claim 5,
The selecting step,
Selects an increase or decrease event corresponding to an event included in the measurement report message from among a plurality of rate increase or decrease events stored by mapping information of a second rate to be increased or decreased in the first rate for each AMR rate state;
The increasing or decreasing step,
And increasing or decreasing the AMR rate at a second rate defined in the increase or decrease event. In the adaptive multi-rate (AMR) transmission rate control method,
Receiving a request for power measurement from a base station control apparatus by a base station or a mobile terminal;
Extracting a plurality of trigger information set for each of a plurality of rate control modes, wherein the rate control mode includes a rate increase event or a rate decrease event from the power measurement;
Determining corresponding trigger information from the plurality of trigger information extracted by measuring power allocated to the mobile terminal; And
Transmitting a measurement report including a rate control event according to the trigger information corresponding to the measured power to the base station,
The rate control event includes a rate increase event or a rate decrease event for a specific AMR rate control mode of the plurality of AMR rate control modes. The method of claim 7, wherein
The plurality of trigger information includes a power upper limit threshold for each of the plurality of rate control modes for increasing a rate, and a power lower limit threshold for each of the plurality of rate control modes for reducing a rate;
The determining step,
AMR rate control method for comparing the measured power with the respective power upper limit threshold and the power lower limit threshold. The method of claim 8,
The transmitting step,
A measurement report including a decrease event of a specific rate control mode corresponding to a power upper limit threshold satisfied by the measured power or a decrease event of a specific rate control mode corresponding to a power lower limit threshold satisfied by the measured power AMR rate control method for transmitting a measurement report.

Images