KR100332812B1 - Data transmission method for mobile telecommunication system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission method of a mobile communication system. In the related art, since the data is interleaved after dividing the number of data including the DTX bits according to the transmission size of one or more physical channels, arbitrary DTX bits do not mix evenly, Only blocks containing bits are mixed. In this case, since a sequence of data having different characteristics is sent together from one or more physical channels, the environment of the channel is greatly affected. In addition, there is a problem in that the data transmission error rate is high due to the small interleaver size, which reduces the capacity for aggregation error. Therefore, in the present invention, if the number of data to be transmitted is greater than the transmission rate of the physical channel, in order to be an integer multiple of the transmission rate, the interleaving and repositioning is performed after inserting the DTX bit at the end of the data string to be transmitted. By separating the data by the required number of physical channels and transmitting them on these separate physical channels simultaneously, the interleaver can be increased in size without the complexity of the hardware, and can be effectively transferred to the physical channel, thereby reducing the transmission bit error rate and the frame error rate. It is to be.

Description

DATA TRANSMISSION METHOD FOR MOBILE TELECOMMUNICATION SYSTEM}

The present invention relates to a process of simultaneously loading a data string to be transmitted in a fixed time to one or more physical channels, especially when the number of bits in the data string to be transmitted is larger or smaller than the number of bits that can be transmitted in the physical channel. The present invention relates to a data transmission method of a mobile communication system for inserting DTX (Discontinuous Transmission) bits to match the number of transmission bits of a physical channel, interleaving the same, and assigning the same to one or more physical channels.

Research is carried out to send data received from the upper layer of the mobile communication system protocol to the physical channel.

This is because there is a difference between the number of data to be transmitted in one CCTrCH (Coded Composite Transport Channel) and the transmission rate of the physical channel that can actually be transmitted in one radio frame and to protect the data from fading of the transport channel. The development of an effective interleaver structure is required.

A data transmission method of a conventional mobile communication system includes a first step of comparing a data rate transmitted from an upper layer and a transmission rate of a physical channel, and when the number of data transmitted from the upper layer is smaller than a transmission rate of a physical channel, Inserting an arbitrary DTX bit into the number to match the rate of the physical channel; and if the number of data transmitted from the upper layer is greater than the rate of the physical channel, create one or more physical channels and The third step of inserting the DTX bit to have a size of and the fourth step of simultaneously transmitting the number of data generated in the third step through one or more physical channels.

Looking at the prior art made of each step as follows.

As shown in FIG. 1, there is a difference between the number of data to be transmitted in a higher layer CCTrCH and a data rate that can be transmitted in a physical channel, that is, the number of data that can actually be transmitted in one radio frame.

As shown in FIG. 1, since the data rate varies according to the capacity of each physical channel, it is necessary to appropriately adjust the size of data to be delivered in one CCTrCH.

Therefore, when the number of data to be transmitted in the CCTrCH is smaller than the transmission rate of the physical channel, as shown in FIG. 2, an arbitrary bit DTX is inserted into the number of data to be transmitted to match the size of the transmission rate of the physical channel.

In this way, if the number of data to be transmitted and the data rate of the physical channel are correct, the data to be transmitted in the CCTrCH is transmitted through the physical channel.

CCTrCH is a channel in which data providing one or more services is mixed in a time multiplex form and contains information to be delivered within a fixed time.

However, if the number of data to be transmitted is larger than the transmission rate of the physical channel, since it is impossible to send data through one physical channel, the system creates one or more physical channels and simultaneously transmits data, based on FIG. 3. Looking at it as follows.

In FIG. 3, if the number of data to be transmitted in the CCTrCH is larger than the transmission rate of the physical channel, two physical channels are created, and arbitrary DTX bits are added to the number of data to be transmitted in accordance with the transmission rate of the two physical channels. Insert it.

Since data created by inserting arbitrary DTX bits are the same as the transmission rate that can be transmitted in the physical channel, the data can be allocated and sent directly to the physical channel. However, in this case, a link error occurs due to fading phenomenon in the transmission channel. And increase the frame error rate.

In order to overcome this, data streams are mixed using an interleaver and then assigned to physical channels, which are described below with reference to FIG. 4.

As shown in (a) of FIG. 4, when the number of data to be transmitted in the CCTrCH is larger than the transmission rate of the physical channel, two physical channels are created, and the number of data to be transmitted in accordance with the transmission rate of the two physical channels thus made. Insert an arbitrary DTX bit into the.

The number of data generated by inserting arbitrary DTX bits is divided according to the number of transmission bits of the physical channel, and the divided data is provided to each interleaver as shown in FIG. Disperse

Each of the interleaved data is simultaneously transmitted through two physical channels as shown in FIG.

However, in the prior art as described above, since the data is interleaved after dividing the number of data including DTX bits according to the transmission size of one or more physical channels, arbitrary DTX bits are not evenly mixed but mixed only in a block including the DTX bits. . In this case, since a sequence of data having different characteristics is sent together from one or more physical channels, the environment of the channel is greatly affected. In addition, there is a problem in that the data transmission error rate is high due to the small interleaver size, which reduces the capacity for aggregation error.

SUMMARY OF THE INVENTION An object of the present invention for solving the conventional problems as described above is to transmit data of a mobile communication system to prepare for a concatenation error due to fading phenomenon in a transmission channel before allocating a data string including DTX to one or more physical channels. In providing a method.

Another object of the present invention is to provide a data transmission method of a mobile communication system to efficiently allocate a physical channel having a fixed transmission data rate to lower a bit error rate and a frame error rate.

1 is an explanatory diagram illustrating a case in which a data rate varies depending on the number of data delivered from an upper layer and the capacity of a physical channel.

2 is an explanatory diagram illustrating a state in which the number of data delivered from an upper layer is adjusted according to the capacity of a physical channel.

3 is an explanatory diagram for simultaneously sending data by creating one or more physical channels when the number of data transmitted from a conventional upper layer is larger than a transmission rate of a physical channel;

FIG. 4 is an explanatory diagram for interleaving and transmitting before transmitting on a physical channel in order to prevent a congestion error and increase a bit error rate and a high frame error rate in FIG.

5 is a flowchart illustrating an operation of a data transmission method of a mobile communication system of the present invention.

6 is an explanatory diagram showing a process of FIG.

The present invention for achieving the above object is a first step of comparing the number of data to be transmitted in the CCTrCH and the transmission rate of the physical channel, and when the number of data to be transmitted is greater than the transmission rate of the physical channel of the data to be transmitted to be an integer multiple of the transmission rate A second step of inserting an arbitrary DTX bit at the end, a third step of interleaving and rearranging the data having the DTX bit inserted therein, and separating the rearranged data by the number of physical channels required And a fifth step of simultaneously transmitting the separated data through the corresponding physical channel.

Hereinafter, with reference to the accompanying drawings in detail as follows.

FIG. 5 is an explanatory diagram for an operation of a data transmission method of a mobile communication system according to the present invention. As shown in FIG. 5, a first step of comparing the number of data to be transmitted on a CCTrCH and a transmission rate of a physical channel, and the data to be transmitted above A second step of inserting an arbitrary DTX bit at the end of the data to be an integer multiple of the transmission rate when the number of times is greater than the transmission rate of the physical channel; and a third step of interleaving and rearranging the data into which the DTX bit is inserted. And a fourth step of separating the rearranged data by the number of one or more required physical channels, a fifth step of mapping the separated data to the corresponding channel, and the data mapped to the channel. A sixth step is performed by adding a code for channel classification and simultaneously transmitting the code.

As described above in detail with reference to the process of Figure 5 for the operation and effect of the present invention made of each step as follows.

There is a difference between the number of data to be transmitted in the upper layer CCTrCH and the data rate that can be transmitted in the physical channel, that is, the number of data that can actually be transmitted in one radio frame.

Therefore, the number of data to be transmitted should be adjusted according to the transmission rate of the physical channel. This is because the transmission bit rate of one radio frame in the physical channel is fixed.

In order to match the transmission rate (S) of the physical channel, the number of data (N) to be transmitted and the transmission rate (S) of the physical channel are respectively confirmed, and the confirmed number of data (N) and the transmission rate (S) of the physical channel are compared. (S101)

As a result of comparison, when the number of data (N) to be transmitted is smaller than the transmission rate (S) of the physical channel, an arbitrary DTX (Discontinuous Transmission) at the end of the data string to be transmitted to match the transmission rate (S) of the fixed physical channel. Insert a bit (S102).

In this way, the DTX-inserted data is loaded on the physical channel (S103).

Therefore, the data carried on the physical channel is transmitted.

As a result of the comparison in step S101, when the number of data to be transmitted (N) is larger than the transmission rate (S) of the physical channel, all the data are not transmitted in one radio frame, and thus several physical channels are required.

An arbitrary DTX bit is inserted at the end of the data string to be transmitted in order to make the number N of data to be transmitted be an integer multiple of the transmission rate of the physical channel (S104).

Here, when the data string is Y before the DTX bit is inserted, and the data string generated as an output is W, the output data string W can be expressed as Equation 1 below.

In this case, the Q value can be expressed by Equation 2 below, which means the number of physical channels required to transmit data belonging to one radio frame. And the value δ may have 0 or 1 as an arbitrary value having no meaning.

Thereafter, the data stream including the DTX is mixed using an interleaver (S105). This may cause a concatenation error in a transport channel, in order to lower the bit error rate and the frame error rate due to the concatenation error.

As described above, the interleaved data is interleaved to output the rearranged output. In this case, when allocated to P physical channels can be expressed as shown in Equation 3 below (S106).

Physical channel 1:

Physical channel 2:

Physical channel 3:

Physical channel P:

The allocated data is mapped to different physical channels 1, 2, ..., and physical channels P, respectively (S106).

After the mapping is completed, since the data is transmitted using the P physical channels to which the data is mapped at the same time, different channel separators are added to each channel in order to distinguish the channels. (S107)

Then, the physical channel can be identified by the channel separator at the receiving end.

The operation as described above will be described with reference to FIG. 6 as follows.

It is assumed that the number of data to be transmitted in the CCTrCH is 200 bits, and the transmission rate of the physical channel for transmitting in 10 ms is 8 Kbps.

In the example assumed above, when the number of data to be transmitted is compared with the transmission rate of the physical channel, the number of data to be transmitted is large, and thus the number of physical channels required is to be obtained.

Since the transmission rate of the physical channel is 8 Kbps, three physical channels are required to send all 200 bits in 10 ms.

However, since three physical channels can transmit 240 bits, 40 bits of DTX bits are needed to fill the empty space.

Therefore, as shown in (a) of FIG. 6, 240 bits are made by inserting 40 bits of DTX bits at the end of the data string to be transferred.

The new data string including the DTX bit is interleaved and rearranged as shown in FIG.

Thereafter, as shown in FIG. 6C, the interleaved data is divided by the number of data that can be transmitted on one physical channel.

The three blocks thus formed are allocated to physical channel 1, physical channel 2, and physical channel 3 as shown in FIG.

When transmitting data allocated to the physical channel, physical channel 1, physical channel 2, and physical channel 3 are simultaneously transmitted. If the allocated data is transmitted as it is, channel classification is not possible. do.

In addition, DTX bits are not actually transmitted during data transmission.

As described in detail above, the present invention can increase the size of the interleaver without the complexity of the hardware, and can effectively transmit the physical channel, thereby reducing the transmission bit error rate and the frame error rate.

Claims (3)

A first step of comparing the number of data to be transmitted in the CCTrCH (Coded Composite Transport Channel) and the transmission rate of the physical channel; and when the number of data to be transmitted is greater than the transmission rate of the physical channel, the end of the data to be transmitted is an integer multiple of the transmission rate. A second step of inserting an arbitrary DTX bit into the second step; a third step of interleaving and rearranging the data into which the DTX bit is inserted; and separating the rearranged data by the number of one or more necessary physical channels. And a fifth step of simultaneously transmitting the separated data through one or more required physical channels. The method of claim 1, wherein the DTX bit is not actually transmitted when data is transmitted through a physical channel. The data transmission method of claim 1, wherein a channel separator is added to transmit data through at least one physical channel to distinguish the channel.