KR100970632B1 - Traffic Control and Data Rate Control Methods - Google Patents

Abstract

The present invention relates to a method for controlling traffic of a reverse link and a data rate for a traffic channel of a reverse link in a communication system, and in particular, a quality of service through a grant message of a forward grant channel (F-GCH). A traffic control method for allocating reverse traffic channels by providing grade information, and data controlling a data rate of the reverse traffic channel by providing a quality of service (QoS class) indicator to the mobile station through a grant message for allocating reverse traffic channels. The present invention relates to a rate control method.

Reverse Packet Data Channel (R-PDCH), Forward Grant Channel (F-GCH), Grant Message, Quality of Service Class, Quality of Service Indicator

Description

Method of controlling traffic and data rate

1 to 3 are diagrams for explaining a traffic control method and a data rate control method in the related art.

4 to 6 are diagrams for explaining a traffic control and data rate control method according to the present invention.

The present invention relates to a traffic control of a reverse link and a method of controlling a data rate for a traffic channel of the reverse link in a communication system.

In the current IS-2000 Revision-D, a structure for a reverse packet data channel (hereinafter, referred to as R-PDCH), which is a new traffic channel of a reverse link, Development is in progress.

The transmission data rate of the reverse link channel including the R-PDCH cannot be arbitrarily determined by the mobile station. The reason is that if a particular mobile station uses a much higher data rate than other mobile stations, it will act as a serious interference to other mobile stations, making the entire system unstable.

Accordingly, the reverse transmission data rate is adjusted by the base station. That is, the base station adjusts the reverse data rate of each mobile station in consideration of the state of the mobile stations and the state of the reverse link channel.

The base station adjusts the reverse data rate of the mobile station, which is classified into a general rate control method and a scheduling method according to a form of informing the mobile station of the corresponding control information.

The general rate control scheme utilizes a small number of information bits, in particular increasing or decreasing the current transmission data rate by a predetermined unit inferred from the previous data rate.

In contrast, the scheduling scheme allows the base station to independently determine the transmission data rate each time through a grant message.

Currently, 3GPP2 adopts a control algorithm in which the general rate control method and the scheduling method are mixed as a method of adjusting the data rate of the reverse link channel.

According to the above control algorithm, the mobile station performs a forward negotiation channel (hereinafter, abbreviated as F-GCH) and a forward-rate control channel through a call negotiation process with a base station. (Hereinafter abbreviated as F-RCCH) is allocated. In addition, through the reverse request channel (hereinafter referred to as R-REQCH) its state, such as buffer size and / or transmit power state and / or quality of service (QoS) Information such as class is informed to the base station.

Accordingly, the base station controls the data rate of the R-PDCH by using a grant message of the F-GCH or rate control bit information of the F-RCCH.

1 to 3 are for explaining a conventional traffic control and data rate control method.

1 is a diagram illustrating a conventional method of adjusting a data rate through an F-RCCH. The rate control bit information is provided to a mobile station through the F-RCCH to control the data rate of the R-PDCH.

Referring to FIG. 1, a mobile station is first assigned an F-GCH and an F-RCCH from a base station.

The mobile station then receives a reverse data rate from the base station via the F-GCH, and then receives a rate control bit via the F-RCCH to adjust the transmission data rate.

FIG. 2 is a diagram for explaining a method of controlling a data rate through a forward grant channel (F-GCH).

2, the mobile station requests specific base station to transmit a specific traffic through the R-REQCH.

The base station then allocates a sub-channel of the R-PDCH for traffic transmission while transmitting a grant message of the F-GCH to the mobile station.

At this time, the base station controls the data rate of each sub-channel independently through a grant message of the F-GCH.

Meanwhile, FIG. 3 is a diagram for setting a data rate control method in a system supporting hybrid automatic repeat request (hereinafter, referred to as H-ARQ) for error control.

In the system supporting H-ARQ in FIG. 3, the packet of the R-PDCH retransmits based on ACK / NACK information of a forward-acknowledgement channel (hereinafter, abbreviated as F-ACKCH).

In this case, K sub-channels may be formed by delay of ACK information. This is because the data rate of the R-PDCH is controlled through the F-RCCH or the F-GCH at the same time as the F-ACKCH.

Therefore, the K sub-channels have data rates independently of each other. 3 shows four sub-channels having independent data rates.

A packet transmitted in the reverse direction through the R-PDCH may determine whether the packet succeeds after the delay of the ACK information. Accordingly, since the subchannels that are independent of each other can be configured until the time when the ACK information is applied, subchannels having a plurality of independent data rates can be configured.

Meanwhile, the conventional F-GCH includes a maximum traffic to pilot power ratio (T / P) value and other information that the mobile station can transmit on the R-PDCH. The F-RCCH includes instructions for rate hold (RATE_HOLD), rate increase (RATE_INCREASE) and rate decrease (RATE_DECREASE).

In this prior art, if a mobile station can be supported with one or more QoS classes through call negotiation with a base station, the mobile station can transmit traffic according to each QoS class. have.

For example, if transmission control through different transmission buffers for video information or file transfer protocol (FTP) information is possible, different quality of service (QoS class) classes may be used depending on the importance, characteristics, or priorities of the different information. ) Can be given. As described above, when different QoS classes are assigned, priorities of transmission are determined differently.

However, conventionally, the base station cannot control the traffic of the mobile station according to the QoS class.

The present invention has been made in view of the above, and in particular, provides traffic quality information through a grant message of a forward grant channel (F-GCH) and controls traffic accordingly to allocate a reverse traffic channel accordingly. The purpose is to provide a method.

It is another object of the present invention to provide a method of controlling a data rate of a reverse traffic channel by providing a quality of service (QoS class) indicator to a mobile station through a grant message for allocating a reverse traffic channel. have.

Traffic control and data rate control method according to the present invention for achieving the above object, when the base station assigns at least one reverse traffic channel to the mobile station, the quality of service (QoS class) of the reverse traffic channel (QoS class) And indicating, by the base station, controlling the data rate of the reverse traffic channel.

The present invention also provides a method for a mobile station to select a desired quality of service class (QoS class) through a reverse request channel (R-REQCH) and the mobile station to transmit a grant message of a forward grant channel (F-GCH). Receiving a QoS class indicator and a corresponding service through a sub-channel of a reverse packet data channel (R-PDCH) allocated according to the QoS class indicator. It is another feature to include transmitting traffic of a quality class (QoS class).

Other objects, features and advantages of the invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, with reference to the accompanying drawings illustrating the configuration and operation of the embodiment of the present invention, the configuration and operation of the present invention shown in the drawings and described by it will be described by at least one embodiment, By the technical concept of the present invention described above and its core configuration and operation is not limited.

Hereinafter, a preferred embodiment of a traffic control and data rate control method according to the present invention will be described with reference to the accompanying drawings.

In the present invention, the mobile station transmits traffic to which at least one QoS class is assigned. The mobile station informs the base station of at least one quality of service class (QoS class) selected by the mobile station to transmit traffic of a specific quality of service (QoS class), in which case the R-REQCH is used.

That is, the mobile station selects at least one desired QoS class, and transmits the selected QoS class through the R-REQCH. Here, the type of traffic information is classified according to the QoS class.

In the present invention, the base station also uses the grant message of the F-GCH when the mobile station allocates a reverse traffic channel on demand. In particular, in the present invention, the base station informs one of the quality of service (QoS class) selected by the mobile station using the quality of service class indicator (QoS class indicator). The QoS class indicator is transmitted to the mobile station through a grant message of the F-GCH.

Meanwhile, in the present invention, the base station allocates the reverse traffic channel to the mobile station according to the quality of service class, and also controls the data rate of the reverse traffic channel. In particular, the base station allocates the R-PDCH to the mobile station according to the quality of service, and also controls the data rate of the R-PDCH.                     

Hereinafter, an R-PDCH which is one of the reverse traffic channels will be described as an example.

The mobile station determines the data rate of the R-PDCH according to the quality of service (QoS) class provided by the base station.

The grant message of the F-GCH is used for channel allocation and data rate control for the traffic.

The base station transmits a quality of service class (QoS class) through a grant message (grant message) of the F-GCH, and in particular, the quality of service class indicator (QoS class indicator) is included in the grant message and transmitted. When the QoS class indicator is included in the grant message and transmitted, the base station further informs the base station of the maximum data rate of the R-PDCH.

Meanwhile, the grant message of the F-GCH includes a field for transmitting a QoS class indicator, and the field is 1 bit or n bits long. That is, the QoS class indicator has a length of 1 bit or n bits.

When using an n-bit QoS class indicator, the mobile station supports at least one quality of service class selected by the MS as a QoS class indicator. To this end, the mobile station transmits the selected at least one quality of service class to the base station through the R-REQCH.

When the mobile station transmits a quality of service class (QoS class) of traffic to the base station through the R-REQCH, it transmits a predetermined bit indicating traffic size information corresponding to the desired (selected) quality of service class (QoS class) to the base station. .

In particular, the n-bit quality class indicator (QoS class indicator) is to inform and classify the quality of service (QoS class) of at least one traffic transmission required by the mobile station, the n-bit quality of service class indicator (QoS class indicator) ) Classifies the traffic according to the QoS class.

Then, the base station designates one of the quality of service classes (QoS class) of the mobile station provided through the R-REQCH through the F-GCH, and accordingly, the mobile station assigns traffic according to the granted quality of service class (QoS class). -Transmit through PDCH.

The mobile station determines the data rate of the R-PDCH according to the QoS class provided through the F-GCH.

On the other hand, when using a 1-bit quality class indicator (QoS class indicator), the 1-bit quality of service class indicator (QoS class indicator) is the traffic quality and quality of service (QoS class) This is to distinguish traffic transmission without QoS class).

In this case, a call negotiation between the base station and the mobile station is assigned to the mobile station, and when the mobile station requests to transmit the corresponding traffic having the quality of service class, An indicator of a corresponding QoS class is turned on and transmitted to the mobile station through a grant message of the F-GCH.                     

In particular, the base station turns on and transmits a 1-bit QoS class indicator, thereby informing the mobile station that the current traffic is a transmission of a QoS class.

Next, a traffic control and data rate control procedure according to the present invention will be described with reference to FIGS. 4 to 6.

4 illustrates a procedure for allocating different independent subchannels to a mobile station as the mobile station requests different types of traffic transmission.

Referring to FIG. 4, the mobile station requests traffic transmission of different QoS classes through the R-REQCH.

Accordingly, the base station allocates subchannels of the R-PDCH according to each QoS class through the F-GCH at different timings.

In the case of allocating a subchannel of the R-PDCH according to each QoS class to the MS, the grant message of the F-GCH includes an n-bit QoS class indicator. To the mobile station. That is, when the base station allocates at least one R-PDCH to the mobile station, the base station informs the mobile station of the QoS class of the R-PDCH.

The mobile station then transmits traffic corresponding to different quality of service classes through different subchannels.

At this time, the base station controls the data rate of the R-PDCH by transmitting a QoS class indicator (QoS class indicator) in the grant message (grant message) of the F-GCH.

5 illustrates a procedure of assigning one subchannel to the mobile station as the mobile station requests one traffic transmission, and then controlling the data rate of the subchannel through the F-RCCH.

The mobile station receives the quality of service indicator through the grant message of the F-GCH and transmits traffic on the assigned R-PDCH sub-channel accordingly.

Thereafter, the data rate of the R-PDCH sub-channel allocated by the rate control bit received through the R-RCCH is adjusted. That is, if data rate adjustment is required for the same sub-channel of the R-PDCH after transmitting traffic at the maximum data rate of the R-PDCH provided through the QoS class indicator, The base station transmits a rate control bit on the F-RCCH to adjust the data rate for subsequent sub-channels of the mobile station.

In FIG. 5, the same subchannels have the same quality of service class (QoS class). If you want to change the quality of service class (QoS class) of the sub-channel only through the grant message of the F-GCH, the quality of service of the R-PDCH sub-channel (sub-channel) is the grant message (grant of the F-GCH) It remains unchanged until a message is received).

FIG. 6 illustrates a procedure for allocating different independent subchannels to the mobile station as the mobile station requests different types of traffic transmissions, and illustrates an example of using a 1-bit QoS class indicator. to be.

Referring to FIG. 6, the mobile station transmits traffic of a quality of service class (QoS class) and other general service quality classes, that is, regardless of the quality of service class, through R-REQCH. ) Request the transfer.

Accordingly, the base station includes a QoS class indicator in a grant message of different F-GCH and transmits it to the mobile station. That is, one bit of QoS class indicator is turned on for transmission of traffic of QoS class and one bit of QoS indicator for transmission of traffic other than quality of service. Transmit by turning off (QoS class indicator).

The following describes other examples in which the base station allocates the R-PDCH to the mobile station.

First, when the base station allocates a sub-channel of the R-PDCH to a plurality of mobile stations, the same quality of service class (QoS class) is allotted to the plurality of sub-channels to be allocated. Grant.

Second, the base station allocates sub-channels of the R-PDCH to a plurality of mobile stations, and assigns two or more QoS classes to the plurality of sub-channels to be allocated. In this case, quality of service classes (QoS classes) are assigned with priority according to the type of traffic requested by the mobile station. That is, a higher quality of service is assigned to traffic having higher priority of traffic requested by the mobile station.

Third, the base station allocates a sub-channel of the R-PDCH to a plurality of mobile stations, and grants two or more QoS classes to the plurality of sub-channels to be allocated. In this case, a sub-channel that has not received a QoS class uses the QoS class of a sub-channel corresponding to a previous frame in the same way.

In the mobile station aspect described above, the mobile station selects the desired quality of service class (QoS class) through the R-REQCH.

The mobile station then receives a QoS class indicator through a grant message of the F-GCH transmitted from the base station.

The mobile station transmits traffic of the corresponding QoS class through a sub-channel of the allocated R-PDCH according to the received QoS class indicator.

Thereafter, the data rate of the sub-channel of the R-PDCH in which traffic is being transmitted is adjusted by a rate control bit transmitted through the F-RCCH, and the data rate is controlled through the F-RCCH. When adjusted, the quality of service class (QoS class) of that sub-channel remains unchanged.

On the other hand, when a mobile station receives a grant message of an F-GCH including another QoS class indicator, the current quality of service class of the R-PDCH sub-channel is received. Change it.                     

As another example of the present invention, if the mobile station operates in autonomous mode without permission of the base station, i.e. without granting through the F-GCH of the base station, the mobile station occupies the R-PDCH itself. Each QoS is assigned to its own traffic and then the rate of the occupied R-PDCH is adjusted by the rate control bit transmitted by the base station on the F-RCCH.

According to the present invention described above, the service quality class indicator is transmitted to the mobile station through a grant message of the F-GCH to allocate a reverse traffic channel (especially an R-PDCH), and the data of the reverse traffic channel. Since the rate is controlled, the base station can control the traffic of the mobile station according to the QoS class.

In addition, the present invention is effectively applied to a system in which quality of service (QoS) is important when a base station uses a combination of a general rate control scheme and a scheduling scheme in controlling a reverse data rate of a mobile station.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (24)

When the base station assigns at least one reverse traffic channel to the mobile station, informing the mobile station of a QoS class of the reverse traffic channel; And controlling the data rate of the reverse traffic channel by the base station. 2. The method of claim 1, wherein the base station transmits the quality of service class through a grant message of a forward grant channel (F-GCH). 3. The method of claim 2, wherein the base station uses a QoS class indicator to indicate the QoS class. 4. The method of claim 3, wherein the grant message includes a field for transmitting the QoS class indicator. 4. The method of claim 3, wherein the QoS class indicator is 1 to n bits. 6. The method of claim 5, wherein the 1-bit QoS class indicator distinguishes between the traffic transmission to which the QoS class is assigned and the traffic transmission to which the QoS class is not received. Traffic control and data rate control method for informing a mobile station. 7. The method of claim 6, wherein when using the 1-bit quality of service class indicator, one quality of service class is assigned through a call negotiation between the base station and the mobile station. Traffic control and data rate control method, characterized in that given to. 8. The mobile station of claim 7, wherein the base station turns on the quality of service class indicator (QoS class indicator) to the mobile station as the mobile station requests to transmit traffic of the granted QoS class. Traffic control and data rate control method, characterized in that. The traffic control method of claim 5, wherein the n-bit quality of service class indicator is used to distinguish and classify a quality of service class of at least one traffic transmission required by the mobile station. And data rate control method. 6. The method of claim 5, wherein the n-bit quality of service class indicator (QoS class indicator) is to inform the mobile station by classifying the type of traffic through the reverse traffic channel according to the quality of service (QoS class) Traffic control and data rate control method. 2. The method of claim 1, wherein the reverse traffic channel is a reverse packet data channel (R-PDCH). 2. The method of claim 1, further comprising the mobile station transmitting a quality of service class (QoS class) for its traffic to the base station via a reverse request channel (R-REQCH). Rate control method. 13. The method of claim 12, wherein the mobile station transmits a quality of service class (QoS class) for the traffic to the base station through the reverse request channel (R-REQCH), the traffic corresponding to a desired quality of service class (QoS class). A method for controlling traffic and data rate, comprising transmitting predetermined bits representing size information. The method of claim 1, wherein the base station further informs the maximum data rate of the reverse traffic channel when the base station informs the received QoS class. 15. The method of claim 14, further comprising the mobile station transmitting traffic over a sub-channel of the assigned reverse traffic channel using the maximum data rate. Control method. 16. The method of claim 15, wherein if a data rate adjustment is required for the same sub-channel of the reverse traffic channel after traffic transmission using the maximum data rate, the base station transmits a forward rate control channel (F-RCCH). And transmitting a rate control bit through a). 17. The method of claim 16, wherein a quality of service (QoS class) of a sub-channel whose data rate is adjusted by the rate control bit (QoS class) is different from the information about the quality of service (QoS class) And maintaining until the grant message of the forward grant channel (F-GCH) is included. The method of claim 1, wherein when the base station allocates a plurality of sub-channels of the reverse traffic channel to the plurality of mobile stations, one quality of service (QoS) for the plurality of sub-channels is provided. traffic control method and data rate control method. 2. The method of claim 1, wherein when the base station allocates a plurality of sub-channels of the reverse traffic channel to the plurality of mobile stations, at least two quality of service classes for the plurality of sub-channels ( In case of assigning a QoS class, the quality of service classes are assigned in a priority order according to the type of traffic requested by the mobile station. The mobile station selecting a desired quality of service class (QoS class) over a reverse request channel (R-REQCH); The mobile station receiving a QoS class indicator via a grant message of a forward grant channel (F-GCH); Transmitting traffic of a quality of service class (QoS class) through a sub-channel of a reverse packet data channel (R-PDCH) allocated according to the quality of service class indicator (QoS class indicator). Traffic control and data rate control method, characterized in that. 21. The method of claim 20, wherein a sub-channel of the reverse packet data channel (R-PDCH) allocated according to the QoS class indicator is transmitted through a forward rate control channel (F-RCCH). A data rate control method, characterized in that the data rate is adjusted by a rate control bit. 22. The traffic control method according to claim 21, wherein when the data rate is adjusted through the forward rate control channel (F-RCCH), the quality of service (QoS class) of the sub-channel is maintained. Data rate control method. 21. The grant message of claim 20, wherein a quality of service class of the sub-channel is assigned to the forward grant channel (F-GCH) in which the mobile station includes a different quality of service class indicator. Traffic control and data rate control method, characterized in that only when receiving (grant message). 20. The method of claim 19, wherein when the mobile station operates in autonomous mode and occupies and uses the reverse packet data channel (R-PDCH) on its own, the mobile station assigns each quality of service to its traffic. QoS class) traffic control and data rate control method characterized in that.

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